-- Copyright (C) 2009 Thilo Cestonaro

-- 

-- This project is MIT/X11 licensed. Please see the

-- COPYING file in the source package for more information.

--

if module:get_host_type() ~= "component" then

	error("proxy65 should be loaded as a component, please see http://prosody.im/doc/components", 0);

end

local jid_split = require "util.jid".split;

local st = require "util.stanza";

local component_register = require "core.componentmanager".register_component;

local component_deregister = require "core.componentmanager".deregister_component;

local configmanager = require "core.configmanager";

local config_get = require "core.configmanager".get;

local connlisteners_register = require "net.connlisteners".register;

local connlisteners_start = require "net.connlisteners".start;

local connlisteners_deregister = require "net.connlisteners".deregister;

local adns, dns = require "net.adns", require "net.dns";

local add_task = require "util.timer".add_task;

local max_dns_depth = config.get("*", "core", "dns_max_depth") or 3;

local dns_timeout = config.get("*", "core", "dns_timeout") or 60;

local sha1 = require "util.hashes".sha1;

local replies_cache = {};

local function bin2hex(bin)

	return bin:gsub(".", function (c) return ("%02x"):format(c:byte()); end)

end

function new_session(conn)

	local w = function(s) conn.write(s:gsub("\n", "\r\n")); end;

	local session = { conn = conn;

			send = function (t) w(tostring(t)); end;

			disconnect = function () conn.close(); end;

			};

	return session;

end

function connlistener.listener(conn, data)

	local session = sessions[conn];

	if session == nil and data ~= nil and data:sub(1):byte() == 0x05 and data:len() > 2 then

		local nmethods = data:sub(2):byte();

		local methods = data:sub(3);

		local supported = false;

		for i=1, nmethods, 1 do

			if(methods:sub(i):byte() == 0x00) then -- 0x00 == method: NO AUTH

				supported = true;

				break;

			end

		end

		if(supported) then

			module:log("debug", "new session found ... ")

			session = new_session(conn);

			sessions[conn] = session;

			session.send(string.char(5, 0));

		end

		return;

	end

	if session ~= nil then

		if session.sha ~= nil and transfers[session.sha] ~= nil then

			local sha = session.sha;

			if transfers[sha].activated == true and transfers[sha].initiator == conn and transfers[sha].target ~= nil then

				transfers[sha].target.write(data);

				return;

			end

		end

		if data ~= nil and data:len() == 0x2F and  -- 40 == length of SHA1 HASH, and 7 other bytes => 47 => 0x2F

			data:sub(1):byte() == 0x05 and -- SOCKS5 has 5 in first byte

			data:sub(2):byte() == 0x01 and -- CMD must be 1

			data:sub(3):byte() == 0x00 and -- RSV must be 0

			data:sub(4):byte() == 0x03 and -- ATYP must be 3

			data:sub(5):byte() == 40 and -- SHA1 HASH length must be 64 (0x40)

			data:sub(-2):byte() == 0x00 and -- PORT must be 0, size 2 byte

			data:sub(-1):byte() == 0x00 		

		then

			local sha = data:sub(6, 45); -- second param is not count! it's the ending index (included!)

			if transfers[sha] == nil then

				transfers[sha] = {};

				transfers[sha].activated = false;

				transfers[sha].target = conn;

				session.sha = sha;

				module:log("debug", "target connected ... ");

			elseif transfers[sha].target ~= nil then

				transfers[sha].initiator = conn;

				session.sha = sha;

				module:log("debug", "initiator connected ... ");

			end

			session.send(string.char(5, 0, 0, 3, sha:len()) .. sha .. string.char(0, 0)); -- VER, REP, RSV, ATYP, BND.ADDR (sha), BND.PORT (2 Byte)

		end

	end

end

function connlistener.disconnect(conn, err)

end

local function get_disco_info(stanza)

	local reply = replies_cache.disco_info;

	if reply == nil then

			:tag("feature", {var="http://jabber.org/protocol/bytestreams"});

		replies_cache.disco_info = reply;

	end

	reply.attr.id = stanza.attr.id;

	reply.attr.to = stanza.attr.from;

	return reply;

end

local function get_disco_items(stanza)

	local reply = replies_cache.disco_items;

	if reply == nil then

		replies_cache.disco_info = reply;

	end

	reply.attr.id = stanza.attr.id;

	reply.attr.to = stanza.attr.from;

	return reply;

end

local function get_stream_host(stanza)

	local reply = replies_cache.stream_host;

	local sid = stanza.tags[1].attr.sid;

	if reply == nil then

			:query("http://jabber.org/protocol/bytestreams")

		replies_cache.stream_host = reply;

	end

	reply.attr.id = stanza.attr.id;

	reply.attr.to = stanza.attr.from;

	reply.tags[1].attr.sid = sid;

	return reply;

end

module.unload = function()

	connlisteners_deregister("proxy65");

end

local function set_activation(stanza)

	if stanza.tags[1] ~= nil and tostring(stanza.tags[1].name) == "query" then

		if stanza.tags[1].attr ~= nil then

			sid = stanza.tags[1].attr.sid;

		end

		if stanza.tags[1].tags[1] ~= nil and tostring(stanza.tags[1].tags[1].name) == "activate" then

			to = stanza.tags[1].tags[1][1];

		end

	end

	if from ~= nil and to ~= nil and sid ~= nil then

		reply.attr.id = stanza.attr.id;

	end

	return reply, from, to, sid;

end

				end

			end

	end

end

end