-- 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 serialize = require "util.serialization".serialize;
local sha1 = require "util.hashes".sha1;
local replies_cache = {};
local _host = module:get_host();
local _name = "SOCKS5 Bytestreams Service";
local connlistener = {registered=false};
local _config = {};
local sessions = {};
local transfers = {};
local component;
_config.port = config_get(_host, "core", "port");
_config.interface = config_get(_host, "core", "interface");
if _config.port == nil then
_config.port = 5000;
end
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;
print = function (t) w("| "..tostring(t).."\n"); end;
disconnect = function () conn.close(); end;
};
return session;
end
function connlistener.listener(conn, data)
module:log("debug", "listener called....")
local session = sessions[conn];
if data ~= nil then module:log("debug", bin2hex(data)); end
if not session and data ~= nil and data:byte() == string.char(5):byte() 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() == string.char(0):byte()) then
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
elseif data ~= nil and data:len() > 6 and
data:sub(1):byte() == string.char(5):byte() and -- SOCKS5 has 5 in first byte
data:sub(2):byte() == string.char(1):byte() and -- CMD must be 1
data:sub(3):byte() == string.char(0):byte() and -- RSV must be 0
data:sub(4):byte() == string.char(3):byte() and -- ATYP must be 3
data:sub(-2):byte() == string.char(0):byte() and data:sub(-1):byte() == string.char(0):byte() -- PORT must be 0, size 2 byte
then
local sha = data:sub(6, data:len() - 2);
module:log("debug", "gotten sha: >%s<", sha);
if transfers[sha] == nil then
transfers[sha] = {};
transfers[sha].target = conn;
module:log("debug", "target connected ... ");
elseif transfers[sha].target ~= nil then
transfers[sha].initiator = conn;
module:log("debug", "initiator connected ... ");
end
session.send(string.char(5, 0, 0, 3, 40) .. sha .. string.char(0, 0)); -- VER, REP, RSV, ATYP, BND.ADDR (sha), BND.PORT (2 Byte)
end
end
function connlistener.disconnect(conn, err)
end
local function get_disco_info(stanza)
local reply = replies_cache.disco_info;
if reply == nil then
reply = st.iq({type='result', from=_host}):query("http://jabber.org/protocol/disco#info")
:tag("identity", {category='proxy', type='bytestreams', name=_name}):up()
: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
reply = st.iq({type='result', from=_host}):query("http://jabber.org/protocol/disco#items");
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
reply = st.iq({type="result", from=_host})
:query("http://jabber.org/protocol/bytestreams")
:tag("streamhost", {jid=_host, host=_config.interface, port=_config.port}); -- TODO get the correct data
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()
component_deregister(_host);
connlisteners_deregister("proxy65");
end
local function set_activation(stanza)
local from = nil;
local to = nil;
local sid = nil;
local reply = nil;
if stanza.attr ~= nil then
from = stanza.attr.from;
end
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 = st.iq({type="result", from=_host});
reply.attr.id = stanza.attr.id;
end
return reply, from, to, sid;
end
local function forward(initiator, target)
module:log("debug", "forward it ....");
end
local function register()
connlistener.default_port = _config.port;
connlistener.default_interface = "*";
connlistener.default_mode = "*a";
connlistener.registered = connlisteners_register('proxy65', connlistener);
if(connlistener.registered == false) then
error("Proxy65: Could not establish a connection listener. Check your configuration please.");
else
connlistener.handler = connlisteners_start('proxy65');
module:log("debug", "Connection listener registered ... ")
module:add_item("proxy65", {jid=_host, name=_name})
component = component_register(_host, function(origin, stanza)
local to_node, to_host, to_resource = jid_split(stanza.attr.to);
if to_node == nil then
local type = stanza.attr.type;
if type == "error" or type == "result" then return; end
if stanza.name == "iq" and type == "get" then
local xmlns = stanza.tags[1].attr.xmlns
if xmlns == "http://jabber.org/protocol/disco#info" then
origin.send(get_disco_info(stanza));
return true;
elseif xmlns == "http://jabber.org/protocol/disco#items" then
origin.send(get_disco_items(stanza));
return true;
elseif xmlns == "http://jabber.org/protocol/bytestreams" then
origin.send(get_stream_host(stanza));
return true;
end
elseif stanza.name == "iq" and type == "set" then
local reply, from, to, sid = set_activation(stanza);
if reply ~= nil and from ~= nil and to ~= nil and sid ~= nil then
module:log("debug", "need to build sha1 of data: from: %s, to: %s, sid: %s", from, to, sid);
local sha = sha1(sid .. from .. to, true);
module:log("debug", "generated sha: %s", sha);
if(transfers[sha] ~= nil and transfers[sha].initiator ~= nil and transfers[sha].target ~= nil) then
origin.send(reply);
forward(transfers[sha].initiator, transfers[sha].target);
transfers[sha] = nil;
end
end
end
end
return;
end);
end
end
local function getDefaultIP(host)
local handle;
handle = adns.lookup(function (reply)
handle = nil;
-- COMPAT: This is a compromise for all you CNAME-(ab)users :)
if not (reply and reply[#reply] and reply[#reply].a) then
local count = max_dns_depth;
reply = dns.peek(host, "CNAME", "IN");
while count > 0 and reply and reply[#reply] and not reply[#reply].a and reply[#reply].cname do
module:log("debug", "Looking up %s (DNS depth is %d)", tostring(reply[#reply].cname), count);
reply = dns.peek(reply[#reply].cname, "A", "IN") or dns.peek(reply[#reply].cname, "CNAME", "IN");
count = count - 1;
end
end
-- end of CNAME resolving
if reply and reply[#reply] and reply[#reply].a then
module:log("debug", "DNS reply for %s gives us %s", host, reply[#reply].a);
_config.interface = reply[#reply].a
return register();
else
module:log("debug", "DNS lookup failed to get a response for %s", host);
if host:find(".") ~= nil then
host = host:gsub("^[^%.]*%.", "");
if host:find(".") ~= nil then -- still one dot left?
return getDefaultIP(host);
end
end
error("Proxy65: Could not get an interface to bind to. Please configure one.");
end
end, host, "A", "IN");
-- Set handler for DNS timeout
add_task(dns_timeout, function ()
if handle then
adns.cancel(handle, true);
end
end);
return true;
end
if _config.interface ~= nil then
register();
else
getDefaultIP(_host); -- try to DNS lookup module:host()
end