mod_proxy65: Remove unused bin2hex function, and compact more code. Finally down <200 lines :)
-- 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 componentmanager = require "core.componentmanager";
local config_get = require "core.configmanager".get;
local connlisteners = require "net.connlisteners";
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 host, name = module:get_host(), "SOCKS5 Bytestreams Service";
local sessions, transfers, component, replies_cache = {}, {}, {}, nil;
local proxy_port = config_get(host, "core", "proxy65_port") or 5000;
local proxy_interface = config_get(host, "core", "proxy65_interface") or "*";
local proxy_address = config_get(host, "core", "proxy65_address") or (proxy_interface ~= "*" and proxy_interface) or module.host;
local connlistener = { default_port = proxy_port,
default_interface = proxy_interface,
default_mode = "*a" };
function connlistener.listener(conn, data)
local session = sessions[conn] or {};
if session.setup == false 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.setup = true;
sessions[conn] = session;
conn.write(string.char(5, 0));
end
return;
end
if session.setup 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
conn.write(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)
if sessions[conn] then
-- Clean up any session-related stuff here
sessions[conn] = nil;
end
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=proxy_address, port=proxy_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()
componentmanager.deregister(host);
connlisteners.deregister("proxy65");
end
local function set_activation(stanza)
local from, to, sid, reply = nil;
from = stanza.attr.from;
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
function handle_to_domain(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
local sha = sha1(sid .. from .. to, true);
if transfers[sha] == nil then
module:log("error", "transfers[sha]: nil");
elseif(transfers[sha] ~= nil and transfers[sha].initiator ~= nil and transfers[sha].target ~= nil) then
origin.send(reply);
transfers[sha].activated = true;
end
end
end
end
return;
end
if not connlisteners.register('proxy65', connlistener) then
error("mod_proxy65: Could not establish a connection listener. Check your configuration please.");
end
connlisteners.start('proxy65');
component = componentmanager.register(host, handle_to_domain);