From c0c815b62d6ef62764679488de40370b6118c03d Mon Sep 17 00:00:00 2001
From: elijah <elijah@riseup.net>
Date: Mon, 8 Dec 2014 13:14:50 -0800
Subject: added `leap tunnel` command.

---
 lib/leap_cli/commands/ssh.rb | 57 +++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 54 insertions(+), 3 deletions(-)

diff --git a/lib/leap_cli/commands/ssh.rb b/lib/leap_cli/commands/ssh.rb
index a7a0d85..40d205e 100644
--- a/lib/leap_cli/commands/ssh.rb
+++ b/lib/leap_cli/commands/ssh.rb
@@ -3,8 +3,8 @@ module LeapCli; module Commands
   desc 'Log in to the specified node with an interactive shell.'
   arg_name 'NAME' #, :optional => false, :multiple => false
   command :ssh do |c|
-    c.flag 'ssh', :desc => "Pass through raw options to ssh (e.g. --ssh '-F ~/sshconfig')"
-    c.flag 'port', :desc => 'Override ssh port for remote host'
+    c.flag 'ssh', :desc => "Pass through raw options to ssh (e.g. `--ssh '-F ~/sshconfig'`)."
+    c.flag 'port', :arg_name => 'SSH_PORT', :desc => 'Override default SSH port used when trying to connect to the server. Same as `--ssh "-p SSH_PORT"`.'
     c.action do |global_options,options,args|
       exec_ssh(:ssh, options, args)
     end
@@ -13,11 +13,28 @@ module LeapCli; module Commands
   desc 'Log in to the specified node with an interactive shell using mosh (requires node to have mosh.enabled set to true).'
   arg_name 'NAME'
   command :mosh do |c|
+    c.flag 'ssh', :desc => "Pass through raw options to ssh (e.g. `--ssh '-F ~/sshconfig'`)."
+    c.flag 'port', :arg_name => 'SSH_PORT', :desc => 'Override default SSH port used when trying to connect to the server. Same as `--ssh "-p SSH_PORT"`.'
     c.action do |global_options,options,args|
       exec_ssh(:mosh, options, args)
     end
   end
 
+  desc 'Creates an SSH port forward (tunnel) to the node NAME. REMOTE_PORT is the port on the remote node that the tunnel will connect to. LOCAL_PORT is the optional port on your local machine. For example: `leap tunnel couch1:5984`.'
+  arg_name '[LOCAL_PORT:]NAME:REMOTE_PORT'
+  command :tunnel do |c|
+    c.flag 'ssh', :desc => "Pass through raw options to ssh (e.g. --ssh '-F ~/sshconfig')."
+    c.flag 'port', :arg_name => 'SSH_PORT', :desc => 'Override default SSH port used when trying to connect to the server. Same as `--ssh "-p SSH_PORT"`.'
+    c.action do |global_options,options,args|
+      local_port, node, remote_port = parse_tunnel_arg(args.first)
+      options[:ssh] = [options[:ssh], "-N -L 127.0.0.1:#{local_port}:0.0.0.0:#{remote_port}"].join(' ')
+      log("Forward port localhost:#{local_port} to #{node.name}:#{remote_port}")
+      if is_port_available?(local_port)
+        exec_ssh(:ssh, options, [node.name])
+      end
+    end
+  end
+
   protected
 
   #
@@ -44,6 +61,18 @@ module LeapCli; module Commands
     puts "(replace `id_rsa` with the actual private key filename that you use for this provider)"
   end
 
+  require 'socket'
+  def is_port_available?(port)
+    TCPServer.open('127.0.0.1', port) {}
+    true
+  rescue Errno::EACCES
+    bail!("You don't have permission to bind to port #{port}.")
+  rescue Errno::EADDRINUSE
+    bail!("Local port #{port} is already in use. Specify LOCAL_PORT to pick another.")
+  rescue Exception => exc
+    bail!(exc.to_s)
+  end
+
   private
 
   def exec_ssh(cmd, cli_options, args)
@@ -88,14 +117,36 @@ module LeapCli; module Commands
     # exec the shell command in a subprocess
     pid = fork { exec "#{command}" }
 
+    Signal.trap("SIGINT") do
+      Process.kill("KILL", pid)
+      Process.wait(pid)
+      exit(0)
+    end
+
     # wait for shell to exit so we can grab the exit status
     _, status = Process.waitpid2(pid)
 
     if status.exitstatus == 255
       ssh_config_help_message
     elsif status.exitstatus != 0
-      exit_now! status.exitstatus, status.exitstatus
+      exit(status.exitstatus)
+    end
+  end
+
+  def parse_tunnel_arg(arg)
+    if arg.count(':') == 1
+      node_name, remote = arg.split(':')
+      local = nil
+    elsif arg.count(':') == 2
+      local, node_name, remote = arg.split(':')
+    else
+      bail!('Argument NAME:REMOTE_PORT required.')
     end
+    node = get_node_from_args([node_name], :include_disabled => true)
+    remote = remote.to_i
+    local = local || remote
+    local = local.to_i
+    return [local, node, remote]
   end
 
 end; end
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