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1 require "luarocks.require"
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2
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3 require "copas"
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4 require "socket"
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5 require "ssl"
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6 require "lxp"
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7
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8 function log(type, area, message)
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9 print(type, area, message);
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10 end
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11
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12 require "core.stanza_dispatch"
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13 require "core.rostermanager"
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14 require "core.offlinemessage"
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15 require "util.stanza"
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16 require "util.jid"
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17
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18 -- Locals for faster access --
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19 local t_insert = table.insert;
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20 local t_concat = table.concat;
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21 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
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22 local m_random = math.random;
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23 local format = string.format;
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24 local st = stanza;
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25 ------------------------------
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26
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27 users = {};
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28 hosts = {
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29 ["localhost"] = {
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30 type = "local";
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31 connected = true;
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32 sessions = {};
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33 };
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34 ["getjabber.ath.cx"] = {
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35 type = "local";
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36 connected = true;
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37 sessions = {};
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38 };
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39 }
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40
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41 local hosts, users = hosts, users;
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42
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43 local ssl_ctx, msg = ssl.newcontext { mode = "server", protocol = "sslv23", key = "/home/matthew/ssl_cert/server.key",
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44 certificate = "/home/matthew/ssl_cert/server.crt", capath = "/etc/ssl/certs", verify = "none", }
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45
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46 if not ssl_ctx then error("Failed to initialise SSL/TLS support: "..tostring(msg)); end
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47
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48
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49 function connect_host(host)
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50 hosts[host] = { type = "remote", sendbuffer = {} };
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51 end
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52
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53 function handler(conn)
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54 local copas_receive, copas_send = copas.receive, copas.send;
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55 local reqdata, sktmsg;
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56 local session = { sendbuffer = { external = {} }, conn = conn, notopen = true, priority = 0 }
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57
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58
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59 -- Logging functions --
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60
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61 local mainlog, log = log;
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62 do
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63 local conn_name = tostring(conn):match("%w+$");
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64 log = function (type, area, message) mainlog(type, conn_name, message); end
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65 end
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66 local print = function (...) log("info", "core", t_concatall({...}, "\t")); end
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67 session.log = log;
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68
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69 -- -- --
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70
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71 -- Send buffers --
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72
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73 local sendbuffer = session.sendbuffer;
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74 local send = function (data) return t_insert(sendbuffer, tostring(data)); end;
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75 local send_to = function (to, stanza)
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76 local node, host, resource = jid.split(to);
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77 print("Routing stanza to "..to..":", node, host, resource);
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78 if not hosts[host] then
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79 print(" ...but host offline, establishing connection");
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80 connect_host(host);
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81 t_insert(hosts[host].sendbuffer, stanza); -- This will be sent when s2s connection succeeds
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82 elseif hosts[host].connected then
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83 print(" ...putting in our external send buffer");
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84 t_insert(sendbuffer.external, { node = node, host = host, resource = resource, data = stanza});
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85 print(" ...there are now "..tostring(#sendbuffer.external).." stanzas in the external send buffer");
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86 end
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87 end
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88 session.send, session.send_to = send, send_to;
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89
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90 -- -- --
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91 print("Client connected");
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92 conn = ssl.wrap(copas.wrap(conn), ssl_ctx);
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93
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94 do
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95 local succ, msg
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96 conn:settimeout(15)
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97 while not succ do
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98 succ, msg = conn:dohandshake()
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99 if not succ then
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100 print("SSL: "..tostring(msg));
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101 if msg == 'wantread' then
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102 socket.select({conn}, nil)
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103 elseif msg == 'wantwrite' then
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104 socket.select(nil, {conn})
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105 else
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106 -- other error
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107 end
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108 end
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109 end
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110 end
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111 print("SSL handshake complete");
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112 -- XML parser initialisation --
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113
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114 local parser;
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115 local stanza;
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116
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117 local stanza_dispatch = init_stanza_dispatcher(session);
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118
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119 local xml_handlers = {};
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120
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121 do
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122 local ns_stack = { "" };
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123 local curr_ns = "";
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124 local curr_tag;
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125 function xml_handlers:StartElement(name, attr)
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126 curr_ns,name = name:match("^(.+):(%w+)$");
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127 print("Tag received:", name, tostring(curr_ns));
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128 if not stanza then
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129 if session.notopen then
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130 if name == "stream" then
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131 session.host = attr.to or error("Client failed to specify destination hostname");
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132 session.version = attr.version or 0;
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133 session.streamid = m_random(1000000, 99999999);
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134 print(session, session.host, "Client opened stream");
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135 send("<?xml version='1.0'?>");
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136 send(format("<stream:stream xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' id='%s' from='%s' >", session.streamid, session.host));
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137 --send("<stream:features>");
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138 --send("<mechanism>PLAIN</mechanism>");
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139 --send [[<register xmlns="http://jabber.org/features/iq-register"/> ]]
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140 --send("</stream:features>");
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141 log("info", "core", "Stream opened successfully");
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142 session.notopen = nil;
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143 return;
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144 end
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145 error("Client failed to open stream successfully");
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146 end
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147 if name ~= "iq" and name ~= "presence" and name ~= "message" then
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148 error("Client sent invalid top-level stanza");
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149 end
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150 stanza = st.stanza(name, { to = attr.to, type = attr.type, id = attr.id, xmlns = curr_ns });
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151 curr_tag = stanza;
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152 else
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153 attr.xmlns = curr_ns;
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154 stanza:tag(name, attr);
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155 end
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156 end
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157 function xml_handlers:CharacterData(data)
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158 if data:match("%S") then
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159 stanza:text(data);
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160 end
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161 end
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162 function xml_handlers:EndElement(name)
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163 curr_ns,name = name:match("^(.+):(%w+)$");
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164 --print("<"..name.."/>", tostring(stanza), tostring(#stanza.last_add < 1), tostring(stanza.last_add[#stanza.last_add].name));
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165 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
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166 -- Complete stanza
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167 print(name, tostring(#stanza.last_add));
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168 if #stanza.last_add == 0 then
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169 stanza_dispatch(stanza);
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170 stanza = nil;
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171 else
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172 stanza:up();
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173 end
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174 end
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175 --[[ function xml_handlers:StartNamespaceDecl(namespace)
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176 table.insert(ns_stack, namespace);
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177 curr_ns = namespace;
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178 log("debug", "parser", "Entering namespace "..tostring(curr_ns));
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179 end
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180 function xml_handlers:EndNamespaceDecl(namespace)
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181 table.remove(ns_stack);
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182 log("debug", "parser", "Leaving namespace "..tostring(curr_ns));
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183 curr_ns = ns_stack[#ns_stack];
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184 log("debug", "parser", "Entering namespace "..tostring(curr_ns));
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185 end
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186 ]]
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187 end
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188 parser = lxp.new(xml_handlers, ":");
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189
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190 -- -- --
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191
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192 -- Main loop --
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193 print "Receiving..."
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194 reqdata = copas_receive(conn, 1);
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195 print "Received"
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196 while reqdata do
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197 parser:parse(reqdata);
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198 if #sendbuffer.external > 0 then
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199 -- Stanzas queued to go to other places, from us
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200 -- ie. other local users, or remote hosts that weren't connected before
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201 print(#sendbuffer.external.." stanzas queued for other recipients, sending now...");
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202 for n, packet in pairs(sendbuffer.external) do
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203 if not hosts[packet.host] then
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204 connect_host(packet.host);
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205 t_insert(hosts[packet.host].sendbuffer, packet.data);
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206 elseif hosts[packet.host].type == "local" then
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207 print(" ...is to a local user")
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208 local destuser = hosts[packet.host].sessions[packet.node];
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209 if destuser and destuser.sessions then
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210 if not destuser.sessions[packet.resource] then
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211 local best_resource;
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212 for resource, session in pairs(destuser.sessions) do
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213 if not best_session then best_session = session;
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214 elseif session.priority >= best_session.priority and session.priority >= 0 then
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215 best_session = session;
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216 end
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217 end
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218 if not best_session then
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219 offlinemessage.new(packet.node, packet.host, packet.data);
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220 else
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221 print("resource '"..packet.resource.."' was not online, have chosen to send to '"..best_session.username.."@"..best_session.host.."/"..best_session.resource.."'");
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222 packet.resource = best_session.resource;
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223 end
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224 end
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225 if destuser.sessions[packet.resource] == session then
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226 log("warn", "core", "Attempt to send stanza to self, dropping...");
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227 else
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228 print("...sending...");
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229 copas_send(destuser.sessions[packet.resource].conn, tostring(packet.data));
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230 print("...sent")
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231 end
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232 elseif packet.data.name == "message" then
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233 print(" ...will be stored offline");
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234 offlinemessage.new(packet.node, packet.host, packet.data);
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235 elseif packet.data.name == "iq" then
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236 print(" ...is an iq");
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237 send(st.reply(packet.data)
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238 :tag("error", { type = "cancel" })
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239 :tag("service-unavailable", { xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas" }));
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240 end
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241 print(" ...removing from send buffer");
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242 sendbuffer.external[n] = nil;
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243 end
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244 end
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245 end
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246
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247 if #sendbuffer > 0 then
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248 for n, data in ipairs(sendbuffer) do
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249 print "Sending..."
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250 copas_send(conn, data);
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251 print "Sent"
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252 sendbuffer[n] = nil;
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253 end
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254 end
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255 print "Receiving..."
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256 repeat
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257 reqdata, sktmsg = copas_receive(conn, 1);
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258 if sktmsg == 'wantread' then
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259 print("Received... wantread");
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260 --socket.select({conn}, nil)
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261 --print("Socket ready now...");
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262 elseif sktmsg then
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263 print("Received socket message:", sktmsg);
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264 end
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265 until reqdata or sktmsg == "closed";
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266 print("Received", tostring(reqdata));
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267 end
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268 log("info", "core", "Client disconnected, connection closed");
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269 end
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270
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271 server = socket.bind("*", 5223)
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272 assert(server, "Failed to bind to socket")
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273 copas.addserver(server, handler)
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274
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275 copas.loop();
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