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require 'socket'
require 'net/ssh/proxy/errors'
require 'net/ssh/ruby_compat'
module Net; module SSH; module Proxy
# An implementation of a command proxy. To use it, instantiate it,
# then pass the instantiated object via the :proxy key to
# Net::SSH.start:
#
# require 'net/ssh/proxy/command'
#
# proxy = Net::SSH::Proxy::Command.new('ssh relay nc %h %p')
# Net::SSH.start('host', 'user', :proxy => proxy) do |ssh|
# ...
# end
class Command
# The command line template
attr_reader :command_line_template
# The command line for the session
attr_reader :command_line
# Create a new socket factory that tunnels via a command executed
# with the user's shell, which is composed from the given command
# template. In the command template, `%h' will be substituted by
# the host name to connect and `%p' by the port.
def initialize(command_line_template)
@command_line_template = command_line_template
@command_line = nil
end
# Return a new socket connected to the given host and port via the
# proxy that was requested when the socket factory was instantiated.
def open(host, port, connection_options = nil)
command_line = @command_line_template.gsub(/%(.)/) {
case $1
when 'h'
host
when 'p'
port.to_s
when 'r'
remote_user = connection_options && connection_options[:remote_user]
if remote_user
remote_user
else
raise ArgumentError, "remote user name not available"
end
when '%'
'%'
else
raise ArgumentError, "unknown key: #{$1}"
end
}
begin
io = IO.popen(command_line, "r+")
if result = Net::SSH::Compat.io_select([io], nil, [io], 60)
if result.last.any?
raise "command failed"
end
else
raise "command timed out"
end
rescue => e
raise ConnectError, "#{e}: #{command_line}"
end
@command_line = command_line
class << io
def send(data, flag)
write_nonblock(data)
end
def recv(size)
read_nonblock(size)
end
end
io
end
end
end; end; end
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