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github.com/AkihiroSuda/go-netfilter-queue
Go bindings for libnetfilter_queue
Forked from openshift/geard@be0423a for supporting recent environments.
This library provides access to packets in the IPTables netfilter queue (NFQUEUE). The libnetfilter_queue library is part of the Netfilter project.
use IPTables to direct all outgoing Ping/ICMP requests to the queue 0:
iptables -A OUTPUT -p icmp -j NFQUEUE --queue-num 0
You can then use go-netfilter-queue to inspect the packets:
package main
import (
"fmt"
"github.com/AkihiroSuda/go-netfilter-queue"
"os"
)
func main() {
var err error
nfq, err := netfilter.NewNFQueue(0, 100, netfilter.NF_DEFAULT_PACKET_SIZE)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
defer nfq.Close()
packets := nfq.GetPackets()
for true {
select {
case p := <-packets:
fmt.Println(p.Packet)
p.SetVerdict(netfilter.NF_ACCEPT)
}
}
}
To inject a new or modified packet in the place of the original packet, use:
p.SetVerdictWithPacket(netfilter.NF_ACCEPT, byte_slice)
Instead of:
p.SetVerdict(netfilter.NF_ACCEPT)
To undo the IPTables redirect. Run:
iptables -D OUTPUT -p icmp -j NFQUEUE --queue-num 0
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