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|
#!/usr/bin/ruby
# A WebSocket to TCP socket proxy
# Copyright 2011 Joel Martin
# Licensed under LGPL version 3 (see docs/LICENSE.LGPL-3)
require 'socket'
$: << "other"
$: << "../other"
require 'websocket'
require 'optparse'
# Proxy traffic to and from a WebSockets client to a normal TCP
# socket server target. All traffic to/from the client is base64
# encoded/decoded to allow binary data to be sent/received to/from
# the target.
class WebSocketProxy < WebSocketServer
@@Traffic_legend = "
Traffic Legend:
} - Client receive
}. - Client receive partial
{ - Target receive
> - Target send
>. - Target send partial
< - Client send
<. - Client send partial
"
def initialize(opts)
vmsg "in WebSocketProxy.initialize"
super(opts)
@target_host = opts["target_host"]
@target_port = opts["target_port"]
end
# Echo back whatever is received
def new_websocket_client(client)
msg "connecting to: %s:%s" % [@target_host, @target_port]
tsock = TCPSocket.open(@target_host, @target_port)
if @verbose then puts @@Traffic_legend end
begin
do_proxy(client, tsock)
rescue
tsock.shutdown(Socket::SHUT_RDWR)
tsock.close
raise
end
end
# Proxy client WebSocket to normal target socket.
def do_proxy(client, target)
cqueue = []
c_pend = 0
tqueue = []
rlist = [client, target]
loop do
wlist = []
if tqueue.length > 0
wlist << target
end
if cqueue.length > 0 || c_pend > 0
wlist << client
end
ins, outs, excepts = IO.select(rlist, wlist, nil, 0.001)
if excepts && excepts.length > 0
raise Exception, "Socket exception"
end
# Send queued client data to the target
if outs && outs.include?(target)
dat = tqueue.shift
sent = target.send(dat, 0)
if sent == dat.length
traffic ">"
else
tqueue.unshift(dat[sent...dat.length])
traffic ".>"
end
end
# Receive target data and queue for the client
if ins && ins.include?(target)
buf = target.recv(@@Buffer_size)
if buf.length == 0
raise EClose, "Target closed"
end
cqueue << buf
traffic "{"
end
# Encode and send queued data to the client
if outs && outs.include?(client)
c_pend = send_frames(cqueue)
cqueue = []
end
# Receive client data, decode it, and send it back
if ins && ins.include?(client)
frames, closed = recv_frames
tqueue += frames
if closed
send_close
raise EClose, closed
end
end
end # loop
end
end
# Parse parameters
opts = {}
parser = OptionParser.new do |o|
o.on('--verbose', '-v') { |b| opts['verbose'] = b }
o.parse!
end
if ARGV.length < 2
puts "Too few arguments"
exit 2
end
# Parse host:port and convert ports to numbers
if ARGV[0].count(":") > 0
opts['listen_host'], _, opts['listen_port'] = ARGV[0].rpartition(':')
else
opts['listen_host'], opts['listen_port'] = nil, ARGV[0]
end
begin
opts['listen_port'] = opts['listen_port'].to_i
rescue
puts "Error parsing listen port"
exit 2
end
if ARGV[1].count(":") > 0
opts['target_host'], _, opts['target_port'] = ARGV[1].rpartition(':')
else
puts "Error parsing target"
exit 2
end
begin
opts['target_port'] = opts['target_port'].to_i
rescue
puts "Error parsing target port"
exit 2
end
puts "Starting server on #{opts['listen_host']}:#{opts['listen_port']}"
server = WebSocketProxy.new(opts)
server.start(100)
server.join
puts "Server has been terminated"
# vim: sw=2
|
