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-rw-r--r--core/offlinemessage.lua13
-rw-r--r--core/rostermanager.lua19
-rw-r--r--core/stanza_dispatch.lua103
-rw-r--r--core/usermanager.lua11
-rw-r--r--main.lua275
-rw-r--r--util/datamanager.lua79
-rw-r--r--util/jid.lua8
-rw-r--r--util/stanza.lua104
8 files changed, 612 insertions, 0 deletions
diff --git a/core/offlinemessage.lua b/core/offlinemessage.lua
new file mode 100644
index 00000000..dda9b7d8
--- /dev/null
+++ b/core/offlinemessage.lua
@@ -0,0 +1,13 @@
+
+require "util.datamanager"
+
+local datamanager = datamanager;
+local t_insert = table.insert;
+
+module "offlinemessage"
+
+function new(user, host, stanza)
+ local offlinedata = datamanager.load(user, host, "offlinemsg") or {};
+ t_insert(offlinedata, stanza);
+ return datamanager.store(user, host, "offlinemsg", offlinedata);
+end
diff --git a/core/rostermanager.lua b/core/rostermanager.lua
new file mode 100644
index 00000000..7a1e7d4e
--- /dev/null
+++ b/core/rostermanager.lua
@@ -0,0 +1,19 @@
+
+local mainlog = log;
+local function log(type, message)
+ mainlog(type, "rostermanager", message);
+end
+
+local setmetatable = setmetatable;
+local format = string.format;
+local loadfile, setfenv, pcall = loadfile, setfenv, pcall;
+
+require "util.datamanager"
+
+local datamanager = datamanager;
+
+module "rostermanager"
+
+function getroster(username, host)
+ return datamanager.load(username, host, "roster") or {};
+end
diff --git a/core/stanza_dispatch.lua b/core/stanza_dispatch.lua
new file mode 100644
index 00000000..b7428ecd
--- /dev/null
+++ b/core/stanza_dispatch.lua
@@ -0,0 +1,103 @@
+
+require "util.stanza"
+
+local st = stanza;
+
+local t_concat = table.concat;
+local format = string.format;
+
+function init_stanza_dispatcher(session)
+ local iq_handlers = {};
+
+ local session_log = session.log;
+ local log = function (type, msg) session_log(type, "stanza_dispatcher", msg); end
+ local send = session.send;
+
+
+
+ iq_handlers["jabber:iq:auth"] =
+ function (stanza)
+ local username = stanza[1]:child_with_name("username");
+ local password = stanza[1]:child_with_name("password");
+ local resource = stanza[1]:child_with_name("resource");
+ if not (username and password and resource) then
+ local reply = st.reply(stanza);
+ send(reply:query("jabber:iq:auth")
+ :tag("username"):up()
+ :tag("password"):up()
+ :tag("resource"):up());
+ return true;
+ else
+ username, password, resource = t_concat(username), t_concat(password), t_concat(resource);
+ print(username, password, resource)
+ local reply = st.reply(stanza);
+ require "core.usermanager"
+ if usermanager.validate_credentials(session.host, username, password) then
+ -- Authentication successful!
+ session.username = username;
+ session.resource = resource;
+ if not hosts[session.host].sessions[username] then
+ hosts[session.host].sessions[username] = { sessions = {} };
+ end
+ hosts[session.host].sessions[username].sessions[resource] = session;
+ send(st.reply(stanza));
+ return true;
+ else
+ local reply = st.reply(stanza);
+ reply.attr.type = "error";
+ reply:tag("error", { code = "401", type = "auth" })
+ :tag("not-authorized", { xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas" });
+ send(reply);
+ return true;
+ end
+ end
+
+ end
+
+ iq_handlers["jabber:iq:roster"] =
+ function (stanza)
+ if stanza.attr.type == "get" then
+ session.roster = session.roster or rostermanager.getroster(session.username, session.host);
+ if session.roster == false then
+ send(st.reply(stanza)
+ :tag("error", { type = "wait" })
+ :tag("internal-server-error", { xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}));
+ return true;
+ else session.roster = session.roster or {};
+ end
+ local roster = st.reply(stanza)
+ :query("jabber:iq:roster");
+ for jid in pairs(session.roster) do
+ roster:tag("item", { jid = jid, subscription = "none" }):up();
+ end
+ send(roster);
+ return true;
+ end
+ end
+
+
+ return function (stanza)
+ log("info", "--> "..tostring(stanza));
+ if stanza.name == "iq" then
+ if not stanza[1] then log("warn", "<iq> without child is invalid"); return; end
+ if not stanza.attr.id then log("warn", "<iq> without id attribute is invalid"); end
+ local xmlns = stanza[1].attr.xmlns;
+ if not xmlns then log("warn", "Child of <iq> has no xmlns - invalid"); return; end
+ if (((not stanza.attr.to) or stanza.attr.to == session.host or stanza.attr.to:match("@[^/]+$")) and (stanza.attr.type == "get" or stanza.attr.type == "set")) then -- Stanza sent to us
+ if iq_handlers[xmlns] then
+ if iq_handlers[xmlns](stanza) then return; end;
+ end
+ log("warn", "Unhandled namespace: "..xmlns);
+ send(format("<iq type='error' id='%s'><error type='cancel'><service-unavailable/></error></iq>", stanza.attr.id));
+ end
+
+ end
+ -- Need to route stanza
+ if stanza.attr.to and ((not hosts[stanza.attr.to]) or hosts[stanza.attr.to].type ~= "local") then
+ stanza.attr.from = session.username.."@"..session.host;
+ session.send_to(stanza.attr.to, stanza);
+ end
+ end
+
+end
+
diff --git a/core/usermanager.lua b/core/usermanager.lua
new file mode 100644
index 00000000..c98a1918
--- /dev/null
+++ b/core/usermanager.lua
@@ -0,0 +1,11 @@
+
+require "util.datamanager"
+local datamanager = datamanager;
+
+module "usermanager"
+
+function validate_credentials(host, username, password)
+ local credentials = datamanager.load(username, host, "accounts") or {};
+ if password == credentials.password then return true; end
+ return false;
+end
diff --git a/main.lua b/main.lua
new file mode 100644
index 00000000..cb6e03fd
--- /dev/null
+++ b/main.lua
@@ -0,0 +1,275 @@
+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();
diff --git a/util/datamanager.lua b/util/datamanager.lua
new file mode 100644
index 00000000..be63673e
--- /dev/null
+++ b/util/datamanager.lua
@@ -0,0 +1,79 @@
+local format = string.format;
+local setmetatable, type = setmetatable, type;
+local pairs = pairs;
+local char = string.char;
+local loadfile, setfenv, pcall = loadfile, setfenv, pcall;
+local log = log;
+local io_open = io.open;
+
+module "datamanager"
+
+
+---- utils -----
+local encode, decode;
+
+local log = function (type, msg) return log(type, "datamanager", msg); end
+
+do
+ local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });
+
+ decode = function (s)
+ return s and (s:gsub("+", " "):gsub("%%([a-fA-F0-9][a-fA-F0-9])", urlcodes));
+ end
+
+ encode = function (s)
+ return s and (s:gsub("%W", function (c) return format("%%%x", c:byte()); end));
+ end
+end
+
+local function basicSerialize (o)
+ if type(o) == "number" or type(o) == "boolean" then
+ return tostring(o)
+ else -- assume it is a string
+ return string.format("%q", tostring(o))
+ end
+end
+
+
+local function simplesave (f, o)
+ if type(o) == "number" then
+ f:write(o)
+ elseif type(o) == "string" then
+ f:write(format("%q", o))
+ elseif type(o) == "table" then
+ f:write("{\n")
+ for k,v in pairs(o) do
+ f:write(" [", format("%q", k), "] = ")
+ simplesave(f, v)
+ f:write(",\n")
+ end
+ f:write("}\n")
+ else
+ error("cannot serialize a " .. type(o))
+ end
+ end
+
+------- API -------------
+
+function getpath(username, host, datastore)
+ return format("data/%s/%s/%s.dat", encode(host), datastore, encode(username));
+end
+
+function load(username, host, datastore)
+ local data, ret = loadfile(getpath(username, host, datastore));
+ if not data then log("warn", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..username.."@"..host); return nil; end
+ setfenv(data, {});
+ local success, ret = pcall(data);
+ if not success then log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..username.."@"..host); return nil; end
+ return ret;
+end
+
+function store(username, host, datastore, data)
+ local f, msg = io_open(getpath(username, host, datastore), "w+");
+ if not f then log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..username.."@"..host); return nil; end
+ f:write("return ");
+ simplesave(f, data);
+ f:close();
+ return true;
+end
+
diff --git a/util/jid.lua b/util/jid.lua
new file mode 100644
index 00000000..9d01e2af
--- /dev/null
+++ b/util/jid.lua
@@ -0,0 +1,8 @@
+
+local match = string.match;
+
+module "jid"
+
+function split(jid)
+ return match(jid, "^([^@]+)@([^/]+)/?(.*)$");
+end
diff --git a/util/stanza.lua b/util/stanza.lua
new file mode 100644
index 00000000..88d0609f
--- /dev/null
+++ b/util/stanza.lua
@@ -0,0 +1,104 @@
+local t_insert = table.insert;
+local t_remove = table.remove;
+local format = string.format;
+local tostring = tostring;
+local setmetatable= setmetatable;
+local pairs = pairs;
+local ipairs = ipairs;
+
+module "stanza"
+
+stanza_mt = {};
+stanza_mt.__index = stanza_mt;
+
+function stanza(name, attr)
+ local stanza = { name = name, attr = attr or {}, last_add = {}};
+ return setmetatable(stanza, stanza_mt);
+end
+
+function stanza_mt:iq(attrs)
+ return self + stanza("iq", attrs)
+end
+function stanza_mt:message(attrs)
+ return self + stanza("message", attrs)
+end
+function stanza_mt:presence(attrs)
+ return self + stanza("presence", attrs)
+end
+function stanza_mt:query(xmlns)
+ return self:tag("query", { xmlns = xmlns });
+end
+function stanza_mt:tag(name, attrs)
+ local s = stanza(name, attrs);
+ (self.last_add[#self.last_add] or self):add_child(s);
+ t_insert(self.last_add, s);
+ return self;
+end
+
+function stanza_mt:text(text)
+ (self.last_add[#self.last_add] or self):add_child(text);
+ return self;
+end
+
+function stanza_mt:up()
+ t_remove(self.last_add);
+ return self;
+end
+
+function stanza_mt:add_child(child)
+ t_insert(self, child);
+end
+
+function stanza_mt:child_with_name(name)
+ for _, child in ipairs(self) do
+ if child.name == name then return child; end
+ end
+end
+
+function stanza_mt.__tostring(t)
+ local children_text = "";
+ for n, child in ipairs(t) do
+ children_text = children_text .. tostring(child);
+ end
+
+ local attr_string = "";
+ if t.attr then
+ for k, v in pairs(t.attr) do attr_string = attr_string .. format(" %s='%s'", k, tostring(v)); end
+ end
+
+ return format("<%s%s>%s</%s>", t.name, attr_string, children_text, t.name);
+end
+
+function stanza_mt.__add(s1, s2)
+ return s:add_child(s2);
+end
+
+
+do
+ local id = 0;
+ function new_id()
+ id = id + 1;
+ return "lx"..id;
+ end
+end
+
+function message(attr, body)
+ if not body then
+ return stanza("message", attr);
+ else
+ return stanza("message", attr):tag("body"):text(body);
+ end
+end
+function iq(attr)
+ if attr and not attr.id then attr.id = new_id(); end
+ return stanza("iq", attr or { id = new_id() });
+end
+
+function reply(orig)
+ return stanza(orig.name, orig.attr and { to = orig.attr.from, from = orig.attr.to, id = orig.attr.id, type = ((orig.name == "iq" and "result") or nil) });
+end
+
+function presence(attr)
+ return stanza("presence", attr);
+end
+