require "luarocks.require"
require "copas"
require "socket"
require "ssl"
require "lxp"
function log(type, area, message)
print(type, area, message);
end
require "core.stanza_dispatch"
require "core.rostermanager"
require "core.offlinemessage"
require "util.stanza"
require "util.jid"
-- Locals for faster access --
local t_insert = table.insert;
local t_concat = table.concat;
local t_concatall = function (t, sep) local tt = {}; for _, s in ipairs(t) do t_insert(tt, tostring(s)); end return t_concat(tt, sep); end
local m_random = math.random;
local format = string.format;
local st = stanza;
------------------------------
users = {};
hosts = {
["localhost"] = {
type = "local";
connected = true;
sessions = {};
};
["getjabber.ath.cx"] = {
type = "local";
connected = true;
sessions = {};
};
}
local hosts, users = hosts, users;
local ssl_ctx, msg = ssl.newcontext { mode = "server", protocol = "sslv23", key = "/home/matthew/ssl_cert/server.key",
certificate = "/home/matthew/ssl_cert/server.crt", capath = "/etc/ssl/certs", verify = "none", }
if not ssl_ctx then error("Failed to initialise SSL/TLS support: "..tostring(msg)); end
function connect_host(host)
hosts[host] = { type = "remote", sendbuffer = {} };
end
function handler(conn)
local copas_receive, copas_send = copas.receive, copas.send;
local reqdata, sktmsg;
local session = { sendbuffer = { external = {} }, conn = conn, notopen = true, priority = 0 }
-- Logging functions --
local mainlog, log = log;
do
local conn_name = tostring(conn):match("%w+$");
log = function (type, area, message) mainlog(type, conn_name, message); end
end
local print = function (...) log("info", "core", t_concatall({...}, "\t")); end
session.log = log;
-- -- --
-- Send buffers --
local sendbuffer = session.sendbuffer;
local send = function (data) return t_insert(sendbuffer, tostring(data)); end;
local send_to = function (to, stanza)
local node, host, resource = jid.split(to);
print("Routing stanza to "..to..":", node, host, resource);
if not hosts[host] then
print(" ...but host offline, establishing connection");
connect_host(host);
t_insert(hosts[host].sendbuffer, stanza); -- This will be sent when s2s connection succeeds
elseif hosts[host].connected then
print(" ...putting in our external send buffer");
t_insert(sendbuffer.external, { node = node, host = host, resource = resource, data = stanza});
print(" ...there are now "..tostring(#sendbuffer.external).." stanzas in the external send buffer");
end
end
session.send, session.send_to = send, send_to;
-- -- --
print("Client connected");
conn = ssl.wrap(copas.wrap(conn), ssl_ctx);
do
local succ, msg
conn:settimeout(15)
while not succ do
succ, msg = conn:dohandshake()
if not succ then
print("SSL: "..tostring(msg));
if msg == 'wantread' then
socket.select({conn}, nil)
elseif msg == 'wantwrite' then
socket.select(nil, {conn})
else
-- other error
end
end
end
end
print("SSL handshake complete");
-- XML parser initialisation --
local parser;
local stanza;
local stanza_dispatch = init_stanza_dispatcher(session);
local xml_handlers = {};
do
local ns_stack = { "" };
local curr_ns = "";
local curr_tag;
function xml_handlers:StartElement(name, attr)
curr_ns,name = name:match("^(.+):(%w+)$");
print("Tag received:", name, tostring(curr_ns));
if not stanza then
if session.notopen then
if name == "stream" then
session.host = attr.to or error("Client failed to specify destination hostname");
session.version = attr.version or 0;
session.streamid = m_random(1000000, 99999999);
print(session, session.host, "Client opened stream");
send("<?xml version='1.0'?>");
send(format("<stream:stream xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' id='%s' from='%s' >", session.streamid, session.host));
--send("<stream:features>");
--send("<mechanism>PLAIN</mechanism>");
--send [[<register xmlns="http://jabber.org/features/iq-register"/> ]]
--send("</stream:features>");
log("info", "core", "Stream opened successfully");
session.notopen = nil;
return;
end
error("Client failed to open stream successfully");
end
if name ~= "iq" and name ~= "presence" and name ~= "message" then
error("Client sent invalid top-level stanza");
end
stanza = st.stanza(name, { to = attr.to, type = attr.type, id = attr.id, xmlns = curr_ns });
curr_tag = stanza;
else
attr.xmlns = curr_ns;
stanza:tag(name, attr);
end
end
function xml_handlers:CharacterData(data)
if data:match("%S") then
stanza:text(data);
end
end
function xml_handlers:EndElement(name)
curr_ns,name = name:match("^(.+):(%w+)$");
--print("<"..name.."/>", tostring(stanza), tostring(#stanza.last_add < 1), tostring(stanza.last_add[#stanza.last_add].name));
if (not stanza) or #stanza.last_add < 0 or (#stanza.last_add > 0 and name ~= stanza.last_add[#stanza.last_add].name) then error("XML parse error in client stream"); end
-- Complete stanza
print(name, tostring(#stanza.last_add));
if #stanza.last_add == 0 then
stanza_dispatch(stanza);
stanza = nil;
else
stanza:up();
end
end
--[[ function xml_handlers:StartNamespaceDecl(namespace)
table.insert(ns_stack, namespace);
curr_ns = namespace;
log("debug", "parser", "Entering namespace "..tostring(curr_ns));
end
function xml_handlers:EndNamespaceDecl(namespace)
table.remove(ns_stack);
log("debug", "parser", "Leaving namespace "..tostring(curr_ns));
curr_ns = ns_stack[#ns_stack];
log("debug", "parser", "Entering namespace "..tostring(curr_ns));
end
]]
end
parser = lxp.new(xml_handlers, ":");
-- -- --
-- Main loop --
print "Receiving..."
reqdata = copas_receive(conn, 1);
print "Received"
while reqdata do
parser:parse(reqdata);
if #sendbuffer.external > 0 then
-- Stanzas queued to go to other places, from us
-- ie. other local users, or remote hosts that weren't connected before
print(#sendbuffer.external.." stanzas queued for other recipients, sending now...");
for n, packet in pairs(sendbuffer.external) do
if not hosts[packet.host] then
connect_host(packet.host);
t_insert(hosts[packet.host].sendbuffer, packet.data);
elseif hosts[packet.host].type == "local" then
print(" ...is to a local user")
local destuser = hosts[packet.host].sessions[packet.node];
if destuser and destuser.sessions then
if not destuser.sessions[packet.resource] then
local best_resource;
for resource, session in pairs(destuser.sessions) do
if not best_session then best_session = session;
elseif session.priority >= best_session.priority and session.priority >= 0 then
best_session = session;
end
end
if not best_session then
offlinemessage.new(packet.node, packet.host, packet.data);
else
print("resource '"..packet.resource.."' was not online, have chosen to send to '"..best_session.username.."@"..best_session.host.."/"..best_session.resource.."'");
packet.resource = best_session.resource;
end
end
if destuser.sessions[packet.resource] == session then
log("warn", "core", "Attempt to send stanza to self, dropping...");
else
print("...sending...");
copas_send(destuser.sessions[packet.resource].conn, tostring(packet.data));
print("...sent")
end
elseif packet.data.name == "message" then
print(" ...will be stored offline");
offlinemessage.new(packet.node, packet.host, packet.data);
elseif packet.data.name == "iq" then
print(" ...is an iq");
send(st.reply(packet.data)
:tag("error", { type = "cancel" })
:tag("service-unavailable", { xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas" }));
end
print(" ...removing from send buffer");
sendbuffer.external[n] = nil;
end
end
end
if #sendbuffer > 0 then
for n, data in ipairs(sendbuffer) do
print "Sending..."
copas_send(conn, data);
print "Sent"
sendbuffer[n] = nil;
end
end
print "Receiving..."
repeat
reqdata, sktmsg = copas_receive(conn, 1);
if sktmsg == 'wantread' then
print("Received... wantread");
--socket.select({conn}, nil)
--print("Socket ready now...");
elseif sktmsg then
print("Received socket message:", sktmsg);
end
until reqdata or sktmsg == "closed";
print("Received", tostring(reqdata));
end
log("info", "core", "Client disconnected, connection closed");
end
server = socket.bind("*", 5223)
assert(server, "Failed to bind to socket")
copas.addserver(server, handler)
copas.loop();