grunt-tunnel-exec

grunt-tunnel-exec

Grunt wrapper around tunnel-exec node module.

Getting Started

This plugin requires Grunt ~0.4.5

If you haven't used Grunt before, be sure to check out the Getting Started guide, as it explains how to create a Gruntfile as well as install and use Grunt plugins. Once you're familiar with that process, you may install this plugin with this command:

npm install grunt-tunnel-exec --save-dev

Once the plugin has been installed, it may be enabled inside your Gruntfile with this line of JavaScript:

grunt.loadNpmTasks('grunt-tunnel-exec');

The "tunnelExec" task

Overview

In your project's Gruntfile, add a section named tunnelExec to the data object passed into grunt.initConfig().

grunt.initConfig({
    tunnelExec: {
        target: {
            options: {
                // Options here.
            },
            exec: function(err, tunnel){
                // Do something here
            }
        }
    },
});

Options

options.remoteHost (required)

Type: String

A string value that represents the hostname or ip of the host that will be accessed through SSH.

options.targetPort (required)

Type: Integer

A numeric value that represents the port forwarded through the tunnel.

options.user (optional)

Type: String Default value: null

A string value that represents the username which will connect to the remote server. If no username given, ssh command will use the default (usually, read ~/.ssh/config file, or use current username).

options.identityFile (optional)

Type: String Default value: null

A string value that represents the path to the identity file used to authenticate with the server (usually, ~/.ssh/id_rsa.pub).

options.localPort (optional)

Type: Integer Default value: (random)

A numeric value that represents the port number that will be used to create the local endpoint of the tunnel.

options.remotePort (optional)

Type: Integer Default value: 22

A numeric value that represents the port in which the SSH client will connect to in the server.

options.targetHost (optional)

Type: String Default value: (same as remoteHost)

A string value that represents the hostname or ip of the host that will be accessed through the tunnel (this is the remote endpoint).

options.timeout (optional)

Type: Integer Default value: 15000

A numeric value that represents the timeout (in milliseconds) of the SSH connection/negotiation.

Usage Examples

Default Options

In this example, the default options are used to start a tunnelExec tunnel. These are the required and minimal options that should be passed.

grunt.initConfig({
    tunnelExec: {
        myTarget: {
            options: {
                remoteHost: 'example.com',
                targetPort: 1234
            },
            exec: function(err, tunnel){
                // Do your stuff here

                // Require http module, we're requesting an html page
                var http = require('http');

                // Request the page, listen for the response
                var request = http.get(

                    // We are using our tunnel!
                    "http://localhost:1234/myPage.html",

                    function(res){

                        // Print data
                        res.on('data', function( data ) {
                            console.log( data.toString() );
                        });

                        res.on('close', function(){
                           // After everything is finished, close tunnel
                           tunnel.done();
                        });

                    }
                );

            }
        }
    },
});

This would execute an SSH command like:

ssh -p 22 example.com -L 1234:example.com:1234 -N -v

Custom Options

In this example, custom options are used to start the api-mock server in port 1235 with another_api.apib as source.

grunt.initConfig({
    tunnelExec: {
        myTarget: {
            options: {

                user: 'myUser',
                identityFile: '~/.ssh/id_dsa.pub',
                localPort: 1234,

                // Host which is being SSH'd
                remoteHost: 'example.com',
                remotePort: 2222,

                // Target host, will receive the commands executed through the tunnel
                targetHost: 'host2.example.com',
                targetPort: 6666,

                // Connection timeout
                timeout: 10000

            },
            exec: function(err, tunnel){
                // Something, then close the tunnel
                tunnel.done();
            }
        }
    },
});

This would execute an SSH command like:

ssh -p 2222 [e-mail] -i ~/.ssh/id_dsa.pub -L 1234:host2.example.com:6666 -N -v

And will timeout after 10 seconds.

Contributing

In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code using Grunt.

Release History

v0.1.0 - Initial release