diff options
Diffstat (limited to 'main.lua')
| -rw-r--r-- | main.lua | 275 |
1 files changed, 275 insertions, 0 deletions
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(); |