DNS API

Package dns implements a full featured interface to the Domain Name System. Both server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The API follows the less-is-more principle, by presenting a small, clean interface. It supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. See https://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Server- and client-side programming is supported. The package allows complete control over what is send out to the DNS. The package API follows the less-is-more principle, by presenting a small, clean interface. The package dns supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified, before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be send. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: If these "advanced" features are not needed, a simple UDP query can be send, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. see http://miek.nl/posts/2014/Sep/21/Private%20RRs%20and%20IDN%20in%20Go%20DNS/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Server- and client-side programming is supported. The package allows complete control over what is send out to the DNS. The package API follows the less-is-more principle, by presenting a small, clean interface. The package dns supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified, before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be send. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: If these "advanced" features are not needed, a simple UDP query can be send, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. see http://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Shaman is a small, clusterable, lightweight, api-driven dns server. To start shaman as a server, simply run (with administrator privileges): For more specific usage information, refer to the help doc `shaman -h`:

Package dns implements a full featured interface to the Domain Name System. Both server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The API follows the less-is-more principle, by presenting a small, clean interface. It supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. See https://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Server- and client-side programming is supported. The package allows complete control over what is send out to the DNS. The package API follows the less-is-more principle, by presenting a small, clean interface. The package dns supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified, before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be send. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: If these "advanced" features are not needed, a simple UDP query can be send, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to an request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. see http://miek.nl/posts/2014/Sep/21/Private%20RRs%20and%20IDN%20in%20Go%20DNS/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns1cloud implements methods for API of 1Cloud's DNS hosting

Package dns implements a full featured interface to the Domain Name System. Both server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The API follows the less-is-more principle, by presenting a small, clean interface. It supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. See https://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Both server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The API follows the less-is-more principle, by presenting a small, clean interface. It supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. See https://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Both server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The API follows the less-is-more principle, by presenting a small, clean interface. It supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. See https://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package certmagic automates the obtaining and renewal of TLS certificates, including TLS & HTTPS best practices such as robust OCSP stapling, caching, HTTP->HTTPS redirects, and more. Its high-level API serves your HTTP handlers over HTTPS if you simply give the domain name(s) and the http.Handler; CertMagic will create and run the HTTPS server for you, fully managing certificates during the lifetime of the server. Similarly, it can be used to start TLS listeners or return a ready-to-use tls.Config -- whatever layer you need TLS for, CertMagic makes it easy. See the HTTPS, Listen, and TLS functions for that. If you need more control, create a Cache using NewCache() and then make a Config using New(). You can then call Manage() on the config. But if you use this lower-level API, you'll have to be sure to solve the HTTP and TLS-ALPN challenges yourself (unless you disabled them or use the DNS challenge) by using the provided Config.GetCertificate function in your tls.Config and/or Config.HTTPChallangeHandler in your HTTP handler. See the package's README for more instruction.

Package dns implements a full featured interface to the Domain Name System. Both server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The API follows the less-is-more principle, by presenting a small, clean interface. It supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. See https://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Server- and client-side programming is supported. The package allows complete control over what is send out to the DNS. The package API follows the less-is-more principle, by presenting a small, clean interface. The package dns supports (asynchronous) querying/replying, incoming/outgoing AXFR/IXFR, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified, before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be send. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: For asynchronous queries it is easy to wrap Exchange() in a goroutine. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to an request. Signature generation, signature verification and key generation are all supported. Writing a DNSSEC validating resolver is hard, if you need something like that you might want to use the Unbound wrapper found at github.com/miekg/unbound . EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines a standard RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: TRANSACTION SIGNATURE (TSIG) An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1 and HmacSHA256. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": When requesting an AXFR (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 85.223.71.124 You can now read the records from the AXFR as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. 3.2.4 - Table Of Metavalues Used In Prerequisite Section The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. 3.4.2.6 - Table Of Metavalues Used In Update Section

Package dns implements a full featured interface to the Domain Name System. Both server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The API follows the less-is-more principle, by presenting a small, clean interface. It supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. See https://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package certmagic automates the obtaining and renewal of TLS certificates, including TLS & HTTPS best practices such as robust OCSP stapling, caching, HTTP->HTTPS redirects, and more. Its high-level API serves your HTTP handlers over HTTPS if you simply give the domain name(s) and the http.Handler; CertMagic will create and run the HTTPS server for you, fully managing certificates during the lifetime of the server. Similarly, it can be used to start TLS listeners or return a ready-to-use tls.Config -- whatever layer you need TLS for, CertMagic makes it easy. See the HTTPS, Listen, and TLS functions for that. If you need more control, create a Cache using NewCache() and then make a Config using New(). You can then call Manage() on the config. But if you use this lower-level API, you'll have to be sure to solve the HTTP and TLS-ALPN challenges yourself (unless you disabled them or use the DNS challenge) by using the provided Config.GetCertificate function in your tls.Config and/or Config.HTTPChallangeHandler in your HTTP handler. See the package's README for more instruction.

Package dns implements a full featured interface to the Domain Name System. Server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The package API follows the less-is-more principle, by presenting a small, clean interface. The package dns supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified, before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. see http://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package hoverdnsapi offers some API actions to control your Hover/TuCOWS DNS entries programmatically. This isn't a supported utility form Hover, it's just a thing I wrote because I needed it at the time. Package hoverdnsapi offers some API actions to control your Hover/TuCOWS DNS entries programmatically. This isn't a supported utility form Hover, it's just a thing I wrote because I needed it at the time.

Package dns implements a full featured interface to the Domain Name System. Server- and client-side programming is supported. The package allows complete control over what is send out to the DNS. The package API follows the less-is-more principle, by presenting a small, clean interface. The package dns supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified, before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be send. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: If these "advanced" features are not needed, a simple UDP query can be send, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. see http://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Both server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The API follows the less-is-more principle, by presenting a small, clean interface. It supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. See https://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Server- and client-side programming is supported. The package allows complete control over what is send out to the DNS. The package API follows the less-is-more principle, by presenting a small, clean interface. The package dns supports (asynchronous) querying/replying, incoming/outgoing AXFR/IXFR, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified, before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be send. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: For asynchronous queries it is easy to wrap Exchange() in a goroutine. Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to an request. Signature generation, signature verification and key generation are all supported. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines a standard RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: TRANSACTION SIGNATURE (TSIG) An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1 and HmacSHA256. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": When requesting an AXFR (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 85.223.71.124 You can now read the records from the AXFR as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. 3.2.4 - Table Of Metavalues Used In Prerequisite Section The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. 3.4.2.6 - Table Of Metavalues Used In Update Section

Package dns implements a full featured interface to the Domain Name System. Server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The package API follows the less-is-more principle, by presenting a small, clean interface. The package dns supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified, before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. see http://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package lightsail provides the client and types for making API requests to Amazon Lightsail. Amazon Lightsail is the easiest way to get started with AWS for developers who just need virtual private servers. Lightsail includes everything you need to launch your project quickly - a virtual machine, SSD-based storage, data transfer, DNS management, and a static IP - for a low, predictable price. You manage those Lightsail servers through the Lightsail console or by using the API or command-line interface (CLI). For more information about Lightsail concepts and tasks, see the Lightsail Dev Guide (https://lightsail.aws.amazon.com/ls/docs/all). To use the Lightsail API or the CLI, you will need to use AWS Identity and Access Management (IAM) to generate access keys. For details about how to set this up, see the Lightsail Dev Guide (http://lightsail.aws.amazon.com/ls/docs/how-to/article/lightsail-how-to-set-up-access-keys-to-use-sdk-api-cli). See https://docs.aws.amazon.com/goto/WebAPI/lightsail-2016-11-28 for more information on this service. See lightsail package documentation for more information. https://docs.aws.amazon.com/sdk-for-go/api/service/lightsail/ To Amazon Lightsail with the SDK use the New function to create a new service client. With that client you can make API requests to the service. These clients are safe to use concurrently. See the SDK's documentation for more information on how to use the SDK. https://docs.aws.amazon.com/sdk-for-go/api/ See aws.Config documentation for more information on configuring SDK clients. https://docs.aws.amazon.com/sdk-for-go/api/aws/#Config See the Amazon Lightsail client Lightsail for more information on creating client for this service. https://docs.aws.amazon.com/sdk-for-go/api/service/lightsail/#New

Package dns implements a full featured interface to the Domain Name System. Both server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The API follows the less-is-more principle, by presenting a small, clean interface. It supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. See https://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package cloudwatchevents provides the client and types for making API requests to Amazon CloudWatch Events. Amazon CloudWatch Events helps you to respond to state changes in your AWS resources. When your resources change state, they automatically send events into an event stream. You can create rules that match selected events in the stream and route them to targets to take action. You can also use rules to take action on a pre-determined schedule. For example, you can configure rules to: Automatically invoke an AWS Lambda function to update DNS entries when an event notifies you that Amazon EC2 instance enters the running state. Direct specific API records from CloudTrail to an Amazon Kinesis stream for detailed analysis of potential security or availability risks. Periodically invoke a built-in target to create a snapshot of an Amazon EBS volume. For more information about the features of Amazon CloudWatch Events, see the Amazon CloudWatch Events User Guide (http://docs.aws.amazon.com/AmazonCloudWatch/latest/events). See https://docs.aws.amazon.com/goto/WebAPI/events-2015-10-07 for more information on this service. See cloudwatchevents package documentation for more information. https://docs.aws.amazon.com/sdk-for-go/api/service/cloudwatchevents/ To Amazon CloudWatch Events with the SDK use the New function to create a new service client. With that client you can make API requests to the service. These clients are safe to use concurrently. See the SDK's documentation for more information on how to use the SDK. https://docs.aws.amazon.com/sdk-for-go/api/ See aws.Config documentation for more information on configuring SDK clients. https://docs.aws.amazon.com/sdk-for-go/api/aws/#Config See the Amazon CloudWatch Events client CloudWatchEvents for more information on creating client for this service. https://docs.aws.amazon.com/sdk-for-go/api/service/cloudwatchevents/#New

Package certmagic automates the obtaining and renewal of TLS certificates, including TLS & HTTPS best practices such as robust OCSP stapling, caching, HTTP->HTTPS redirects, and more. Its high-level API serves your HTTP handlers over HTTPS if you simply give the domain name(s) and the http.Handler; CertMagic will create and run the HTTPS server for you, fully managing certificates during the lifetime of the server. Similarly, it can be used to start TLS listeners or return a ready-to-use tls.Config -- whatever layer you need TLS for, CertMagic makes it easy. See the HTTPS, Listen, and TLS functions for that. If you need more control, create a Cache using NewCache() and then make a Config using New(). You can then call Manage() on the config. But if you use this lower-level API, you'll have to be sure to solve the HTTP and TLS-ALPN challenges yourself (unless you disabled them or use the DNS challenge) by using the provided Config.GetCertificate function in your tls.Config and/or Config.HTTPChallangeHandler in your HTTP handler. See the package's README for more instruction.

Package dns implements a full featured interface to the Domain Name System. Server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The package API follows the less-is-more principle, by presenting a small, clean interface. The package dns supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified, before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. see http://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Shaman is a small, clusterable, lightweight, api-driven dns server. To start shaman as a server, simply run (with administrator privileges): For more specific usage information, refer to the help doc `shaman -h`:

Package dns implements a full featured interface to the Domain Name System. Server- and client-side programming is supported. The package allows complete control over what is send out to the DNS. The package API follows the less-is-more principle, by presenting a small, clean interface. The package dns supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified, before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be send. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: If these "advanced" features are not needed, a simple UDP query can be send, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. see http://miek.nl/posts/2014/Sep/21/Private%20RRs%20and%20IDN%20in%20Go%20DNS/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The package API follows the less-is-more principle, by presenting a small, clean interface. The package dns supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified, before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are availabe using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. see http://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Both server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The API follows the less-is-more principle, by presenting a small, clean interface. It supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. See https://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package letsencrypt obtains TLS certificates from LetsEncrypt.org. LetsEncrypt.org is a service that issues free SSL/TLS certificates to servers that can prove control over the given domain's DNS records or the servers pointed at by those records. Like any other random code you find on the internet, this package should not be relied upon in important, production systems without thorough testing to ensure that it meets your needs. In the long term you should be using https://golang.org/x/crypto/acme/autocert instead of this package. Send improvements there, not here. This is a package that I wrote for my own personal web sites (swtch.com, rsc.io) in a hurry when my paid-for SSL certificate was expiring. It has no tests, has barely been used, and there is some anecdotal evidence that it does not properly renew certificates in a timely fashion, so servers that run for more than 3 months may run into trouble. I don't run this code anymore: to simplify maintenance, I moved the sites off of Ubuntu VMs and onto Google App Engine, configured with inexpensive long-term certificates purchased from cheapsslsecurity.com. This package was interesting primarily as an example of how simple the API for using LetsEncrypt.org could be made, in contrast to the low-level implementations that existed at the time. In that respect, it helped inform the design of the golang.org/x/crypto/acme/autocert package. A complete HTTP/HTTPS web server using TLS certificates from LetsEncrypt.org, redirecting all HTTP access to HTTPS, and maintaining TLS certificates in a file letsencrypt.cache across server restarts. The fundamental type in this package is the Manager, which manages obtaining and refreshing a collection of TLS certificates, typically for use by an HTTPS server. The example above shows the most basic use of a Manager. The use can be customized by calling additional methods of the Manager. A Manager m registers anonymously with LetsEncrypt.org, including agreeing to the letsencrypt.org terms of service, the first time it needs to obtain a certificate. To register with a particular email address and with the option of a prompt for agreement with the terms of service, call m.Register. The Manager's GetCertificate method returns certificates from the Manager's cache, filling the cache by requesting certificates from LetsEncrypt.org. In this way, a server with a tls.Config.GetCertificate set to m.GetCertificate will demand load a certificate for any host name it serves. To force loading of certificates ahead of time, install m.GetCertificate as before but then call m.Cert for each host name. A Manager can only obtain a certificate for a given host name if it can prove control of that host name to LetsEncrypt.org. By default it proves control by answering an HTTPS-based challenge: when the LetsEncrypt.org servers connect to the named host on port 443 (HTTPS), the TLS SNI handshake must use m.GetCertificate to obtain a per-host certificate. The most common way to satisfy this requirement is for the host name to resolve to the IP address of a (single) computer running m.ServeHTTPS, or at least running a Go TLS server with tls.Config.GetCertificate set to m.GetCertificate. However, other configurations are possible. For example, a group of machines could use an implementation of tls.Config.GetCertificate that cached certificates but handled cache misses by making RPCs to a Manager m on an elected leader machine. In typical usage, then, the setting of tls.Config.GetCertificate to m.GetCertificate serves two purposes: it provides certificates to the TLS server for ordinary serving, and it also answers challenges to prove ownership of the domains in order to obtain those certificates. To force the loading of a certificate for a given host into the Manager's cache, use m.Cert. If a server always starts with a zero Manager m, the server effectively fetches a new certificate for each of its host name from LetsEncrypt.org on each restart. This is unfortunate both because the server cannot start if LetsEncrypt.org is unavailable and because LetsEncrypt.org limits how often it will issue a certificate for a given host name (at time of writing, the limit is 5 per week for a given host name). To save server state proactively to a cache file and to reload the server state from that same file when creating a new manager, call m.CacheFile with the name of the file to use. For alternate storage uses, m.Marshal returns the current state of the Manager as an opaque string, m.Unmarshal sets the state of the Manager using a string previously returned by m.Marshal (usually a different m), and m.Watch returns a channel that receives notifications about state changes. To avoid hitting basic rate limits on LetsEncrypt.org, a given Manager limits all its interactions to at most one request every minute, with an initial allowed burst of 20 requests. By default, if GetCertificate is asked for a certificate it does not have, it will in turn ask LetsEncrypt.org for that certificate. This opens a potential attack where attackers connect to a server by IP address and pretend to be asking for an incorrect host name. Then GetCertificate will attempt to obtain a certificate for that host, incorrectly, eventually hitting LetsEncrypt.org's rate limit for certificate requests and making it impossible to obtain actual certificates. Because servers hold certificates for months at a time, however, an attack would need to be sustained over a time period of at least a month in order to cause real problems. To mitigate this kind of attack, a given Manager limits itself to an average of one certificate request for a new host every three hours, with an initial allowed burst of up to 20 requests. Long-running servers will therefore stay within the LetsEncrypt.org limit of 300 failed requests per month. Certificate refreshes are not subject to this limit. To eliminate the attack entirely, call m.SetHosts to enumerate the exact set of hosts that are allowed in certificate requests. The basic requirement for use of a Manager is that there be an HTTPS server running on port 443 and calling m.GetCertificate to obtain TLS certificates. Using standard primitives, the way to do this is: However, this pattern of serving HTTPS with demand-loaded TLS certificates comes up enough to wrap into a single method m.ServeHTTPS. Similarly, many HTTPS servers prefer to redirect HTTP clients to the HTTPS URLs. That functionality is provided by RedirectHTTP. The combination of serving HTTPS with demand-loaded TLS certificates and serving HTTPS redirects to HTTP clients is provided by m.Serve, as used in the original example above.

Package dns implements a full featured interface to the Domain Name System. Both server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The API follows the less-is-more principle, by presenting a small, clean interface. It supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. See https://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Both server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The API follows the less-is-more principle, by presenting a small, clean interface. It supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get DNS message. A DNS message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. See https://miek.nl/2014/september/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (RFC 7871). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

PBJelly A uh.... "simple" script to update Porkbun DNS records using their API.

Package dns implements a full featured interface to the Domain Name System. Both server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The API follows the less-is-more principle, by presenting a small, clean interface. It supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get DNS message. A DNS message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. A custom TSIG implementation can be used. This requires additional code to perform any session establishment and signature generation/verification. The client must be configured with an implementation of the TsigProvider interface: Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. See https://miek.nl/2014/september/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines a new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (RFC 7871). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Server- and client-side programming is supported. The package allows complete control over what is send out to the DNS. The package API follows the less-is-more principle, by presenting a small, clean interface. The package dns supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified, before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be send. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: If these "advanced" features are not needed, a simple UDP query can be send, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to an request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. see http://miek.nl/posts/2014/Sep/21/Private%20RRs%20and%20IDN%20in%20Go%20DNS/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Server- and client-side programming is supported. The package allows complete control over what is send out to the DNS. The package API follows the less-is-more principle, by presenting a small, clean interface. The package dns supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified, before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be send. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: If these "advanced" features are not needed, a simple UDP query can be send, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to an request. Signature generation, signature verification and key generation are all supported. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1 and HmacSHA256. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. 3.2.4 - Table Of Metavalues Used In Prerequisite Section The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. 3.4.2.6 - Table Of Metavalues Used In Update Section

Package dns implements a full featured interface to the Domain Name System. Server- and client-side programming is supported. The package allows complete control over what is send out to the DNS. The package API follows the less-is-more principle, by presenting a small, clean interface. The package dns supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified, before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be send. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: If these "advanced" features are not needed, a simple UDP query can be send, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to an request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. see http://miek.nl/posts/2014/Sep/21/Private%20RRs%20and%20IDN%20in%20Go%20DNS/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Server- and client-side programming is supported. The package allows complete control over what is send out to the DNS. The package API follows the less-is-more principle, by presenting a small, clean interface. The package dns supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified, before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be send. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: If these "advanced" features are not needed, a simple UDP query can be send, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to an request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. see http://miek.nl/posts/2014/Sep/21/Private%20RRs%20and%20IDN%20in%20Go%20DNS/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The package API follows the less-is-more principle, by presenting a small, clean interface. The package dns supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified, before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. see http://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Both server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The API follows the less-is-more principle, by presenting a small, clean interface. It supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get DNS message. A DNS message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. A custom TSIG implementation can be used. This requires additional code to perform any session establishment and signature generation/verification. The client must be configured with an implementation of the TsigProvider interface: Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. See https://miek.nl/2014/september/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (RFC 7871). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Both server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The API follows the less-is-more principle, by presenting a small, clean interface. It supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. See https://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Both server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The API follows the less-is-more principle, by presenting a small, clean interface. It supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. See https://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Server- and client-side programming is supported. The package allows complete control over what is send out to the DNS. The package API follows the less-is-more principle, by presenting a small, clean interface. The package dns supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified, before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be send. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: If these "advanced" features are not needed, a simple UDP query can be send, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. see http://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The package API follows the less-is-more principle, by presenting a small, clean interface. The package dns supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified, before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. see http://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Both server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The API follows the less-is-more principle, by presenting a small, clean interface. It supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get DNS message. A DNS message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. A custom TSIG implementation can be used. This requires additional code to perform any session establishment and signature generation/verification. The client must be configured with an implementation of the TsigProvider interface: Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. See https://miek.nl/2014/september/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines a new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (RFC 7871). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Both server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The API follows the less-is-more principle, by presenting a small, clean interface. It supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. See https://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.

Package dns implements a full featured interface to the Domain Name System. Both server- and client-side programming is supported. The package allows complete control over what is sent out to the DNS. The API follows the less-is-more principle, by presenting a small, clean interface. It supports (asynchronous) querying/replying, incoming/outgoing zone transfers, TSIG, EDNS0, dynamic updates, notifies and DNSSEC validation/signing. Note that domain names MUST be fully qualified before sending them, unqualified names in a message will result in a packing failure. Resource records are native types. They are not stored in wire format. Basic usage pattern for creating a new resource record: Or directly from a string: Or when the default origin (.) and TTL (3600) and class (IN) suit you: Or even: In the DNS messages are exchanged, these messages contain resource records (sets). Use pattern for creating a message: Or when not certain if the domain name is fully qualified: The message m is now a message with the question section set to ask the MX records for the miek.nl. zone. The following is slightly more verbose, but more flexible: After creating a message it can be sent. Basic use pattern for synchronous querying the DNS at a server configured on 127.0.0.1 and port 53: Suppressing multiple outstanding queries (with the same question, type and class) is as easy as setting: More advanced options are available using a net.Dialer and the corresponding API. For example it is possible to set a timeout, or to specify a source IP address and port to use for the connection: If these "advanced" features are not needed, a simple UDP query can be sent, with: When this functions returns you will get dns message. A dns message consists out of four sections. The question section: in.Question, the answer section: in.Answer, the authority section: in.Ns and the additional section: in.Extra. Each of these sections (except the Question section) contain a []RR. Basic use pattern for accessing the rdata of a TXT RR as the first RR in the Answer section: Both domain names and TXT character strings are converted to presentation form both when unpacked and when converted to strings. For TXT character strings, tabs, carriage returns and line feeds will be converted to \t, \r and \n respectively. Back slashes and quotations marks will be escaped. Bytes below 32 and above 127 will be converted to \DDD form. For domain names, in addition to the above rules brackets, periods, spaces, semicolons and the at symbol are escaped. DNSSEC (DNS Security Extension) adds a layer of security to the DNS. It uses public key cryptography to sign resource records. The public keys are stored in DNSKEY records and the signatures in RRSIG records. Requesting DNSSEC information for a zone is done by adding the DO (DNSSEC OK) bit to a request. Signature generation, signature verification and key generation are all supported. Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details. You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites. The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call. An TSIG or transaction signature adds a HMAC TSIG record to each message sent. The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512. Basic use pattern when querying with a TSIG name "axfr." (note that these key names must be fully qualified - as they are domain names) and the base64 secret "so6ZGir4GPAqINNh9U5c3A==": If an incoming message contains a TSIG record it MUST be the last record in the additional section (RFC2845 3.2). This means that you should make the call to SetTsig last, right before executing the query. If you make any changes to the RRset after calling SetTsig() the signature will be incorrect. When requesting an zone transfer (almost all TSIG usage is when requesting zone transfers), with TSIG, this is the basic use pattern. In this example we request an AXFR for miek.nl. with TSIG key named "axfr." and secret "so6ZGir4GPAqINNh9U5c3A==" and using the server 176.58.119.54: You can now read the records from the transfer as they come in. Each envelope is checked with TSIG. If something is not correct an error is returned. Basic use pattern validating and replying to a message that has TSIG set. RFC 6895 sets aside a range of type codes for private use. This range is 65,280 - 65,534 (0xFF00 - 0xFFFE). When experimenting with new Resource Records these can be used, before requesting an official type code from IANA. See https://miek.nl/2014/September/21/idn-and-private-rr-in-go-dns/ for more information. EDNS0 is an extension mechanism for the DNS defined in RFC 2671 and updated by RFC 6891. It defines an new RR type, the OPT RR, which is then completely abused. Basic use pattern for creating an (empty) OPT RR: The rdata of an OPT RR consists out of a slice of EDNS0 (RFC 6891) interfaces. Currently only a few have been standardized: EDNS0_NSID (RFC 5001) and EDNS0_SUBNET (draft-vandergaast-edns-client-subnet-02). Note that these options may be combined in an OPT RR. Basic use pattern for a server to check if (and which) options are set: SIG(0) From RFC 2931: It works like TSIG, except that SIG(0) uses public key cryptography, instead of the shared secret approach in TSIG. Supported algorithms: DSA, ECDSAP256SHA256, ECDSAP384SHA384, RSASHA1, RSASHA256 and RSASHA512. Signing subsequent messages in multi-message sessions is not implemented.