prosody-modules
54fa9d6d7809
mod_websocket/mod_websocket.lua

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mod_websocket/mod_websocket.lua @ 676:54fa9d6d7809

mod_websocket: New mod_c2s based version, still WIP
author Florian Zeitz <florob@babelmonkeys.de>
date Fri, 25 May 2012 17:20:41 +0200
parent 129:5fc00a3e47b5
child 677:eeb41cd5e9f3
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 -- Copyright (C) 2012 Florian Zeitz
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5 --
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6 -- This project is MIT/X11 licensed. Please see the
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7 -- COPYING file in the source package for more information.
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8 --
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9
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10 module:set_global();
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12 local add_task = require "util.timer".add_task;
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13 local new_xmpp_stream = require "util.xmppstream".new;
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14 local nameprep = require "util.encodings".stringprep.nameprep;
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15 local sessionmanager = require "core.sessionmanager";
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16 local st = require "util.stanza";
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17 local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session;
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18 local uuid_generate = require "util.uuid".generate;
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19 local sha1 = require "util.hashes".sha1;
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20 local base64 = require "util.encodings".base64.encode;
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21 local bxor = require "bit".bxor;
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22 local tohex = require "bit".tohex;
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24 module:depends("http")
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27 local xpcall, tostring, type = xpcall, tostring, type;
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28 local traceback = debug.traceback;
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29
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30 local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
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31
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32 local log = module._log;
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33
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34 local c2s_timeout = module:get_option_number("c2s_timeout");
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35 local opt_keepalives = module:get_option_boolean("tcp_keepalives", false);
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36
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37 local sessions = module:shared("sessions");
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38
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39 local stream_callbacks = { default_ns = "jabber:client", handlestanza = core_process_stanza };
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40 local listener = {};
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41
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42 --- Stream events handlers
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43 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
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44 local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
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45
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46 function stream_callbacks.streamopened(session, attr)
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47 local send = session.send;
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48 session.host = nameprep(attr.to);
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49 if not session.host then
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50 session:close{ condition = "improper-addressing",
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51 text = "A valid 'to' attribute is required on stream headers" };
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52 return;
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53 end
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54 session.version = tonumber(attr.version) or 0;
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55 session.streamid = uuid_generate();
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56 (session.log or session)("debug", "Client sent opening <stream:stream> to %s", session.host);
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57
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58 if not hosts[session.host] then
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59 -- We don't serve this host...
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60 session:close{ condition = "host-unknown", text = "This server does not serve "..tostring(session.host)};
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61 return;
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62 end
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63
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64 send("<?xml version='1.0'?>"..(tostring(st.stanza("stream:stream", {
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65 xmlns = 'jabber:client', ["xmlns:stream"] = 'http://etherx.jabber.org/streams';
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66 id = session.streamid, from = session.host, version = '1.0', ["xml:lang"] = 'en' }):top_tag()):gsub(">", "/>")));
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67
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68 (session.log or log)("debug", "Sent reply <stream:stream> to client");
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69 session.notopen = nil;
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70
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71 -- If session.secure is *false* (not nil) then it means we /were/ encrypting
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72 -- since we now have a new stream header, session is secured
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73 if session.secure == false then
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74 session.secure = true;
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75 end
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76
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77 local features = st.stanza("stream:features");
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78 hosts[session.host].events.fire_event("stream-features", { origin = session, features = features });
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79 module:fire_event("stream-features", session, features);
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80
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81 send(features);
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82 end
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83
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84 function stream_callbacks.streamclosed(session)
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85 session.log("debug", "Received </stream:stream>");
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86 session:close();
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87 end
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88
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89 function stream_callbacks.error(session, error, data)
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90 if error == "no-stream" then
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91 session.log("debug", "Invalid opening stream header");
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92 session:close("invalid-namespace");
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93 elseif error == "parse-error" then
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94 (session.log or log)("debug", "Client XML parse error: %s", tostring(data));
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95 session:close("not-well-formed");
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96 elseif error == "stream-error" then
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97 local condition, text = "undefined-condition";
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98 for child in data:children() do
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99 if child.attr.xmlns == xmlns_xmpp_streams then
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100 if child.name ~= "text" then
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101 condition = child.name;
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102 else
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103 text = child:get_text();
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104 end
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105 if condition ~= "undefined-condition" and text then
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106 break;
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107 end
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108 end
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109 end
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110 text = condition .. (text and (" ("..text..")") or "");
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111 session.log("info", "Session closed by remote with error: %s", text);
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112 session:close(nil, text);
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113 end
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114 end
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115
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116 local function handleerr(err) log("error", "Traceback[c2s]: %s: %s", tostring(err), traceback()); end
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117 function stream_callbacks.handlestanza(session, stanza)
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118 stanza = session.filter("stanzas/in", stanza);
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119 if stanza then
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120 return xpcall(function () return core_process_stanza(session, stanza) end, handleerr);
129
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121 end
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122 end
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123
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124 --- Session methods
129
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125 local function session_close(session, reason)
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126 local log = session.log or log;
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127 if session.conn then
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128 if session.notopen then
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129 session.send("<?xml version='1.0'?>");
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130 session.send(st.stanza("stream:stream", default_stream_attr):top_tag());
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131 end
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132 if reason then
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133 if type(reason) == "string" then -- assume stream error
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134 log("info", "Disconnecting client, <stream:error> is: %s", reason);
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135 session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
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136 elseif type(reason) == "table" then
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137 if reason.condition then
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138 local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
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139 if reason.text then
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140 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
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141 end
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142 if reason.extra then
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143 stanza:add_child(reason.extra);
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144 end
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145 log("info", "Disconnecting client, <stream:error> is: %s", tostring(stanza));
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146 session.send(stanza);
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147 elseif reason.name then -- a stanza
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148 log("info", "Disconnecting client, <stream:error> is: %s", tostring(reason));
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149 session.send(reason);
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150 end
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151 end
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152 end
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153 session.send("</stream:stream>");
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154 session.conn:close();
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155 listener.ondisconnect(session.conn, (reason and (reason.text or reason.condition)) or reason or "session closed");
129
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156 end
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157 end
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158
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159 --- Port listener
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160 function listener.onconnect(conn)
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161 local session = sm_new_session(conn);
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162 sessions[conn] = session;
129
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163
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164 session.log("info", "Client connected");
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165
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166 -- Client is using legacy SSL (otherwise mod_tls sets this flag)
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167 if conn:ssl() then
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168 session.secure = true;
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169 end
129
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170
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171 if opt_keepalives then
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172 conn:setoption("keepalive", opt_keepalives);
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173 end
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174
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175 session.close = session_close;
129
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176
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177 local stream = new_xmpp_stream(session, stream_callbacks);
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178 session.stream = stream;
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179 session.notopen = true;
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180
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181 function session.reset_stream()
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182 session.notopen = true;
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183 session.stream:reset();
129
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184 end
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185
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186 local filter = session.filter;
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187 function session.data(data)
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188 local off = 0;
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189 local len = string.byte(data, 2) - 0x80;
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190 if len == 126 then
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191 off = 2;
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192 elseif len ==127 then
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193 off = 8;
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194 end
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195 local key = {string.byte(data, off+3), string.byte(data, off+4), string.byte(data, off+5), string.byte(data, off+6)}
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196 local decoded = "";
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197 local counter = 0;
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198 for i = off+7, #data do
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199 decoded = decoded .. string.char(bxor(key[counter+1], string.byte(data, i)));
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200 counter = (counter + 1) % 4;
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201 end
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202 module:log("debug", "Websocket received: %s %i", decoded, #decoded)
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203 decoded = decoded:gsub("/>$", ">");
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204
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205 data = filter("bytes/in", decoded);
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206 if data then
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207 local ok, err = stream:feed(data);
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208 if ok then return; end
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209 log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_"));
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210 session:close("not-well-formed");
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211 end
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diff changeset
212 end
129
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213
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214 function session.send(s)
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215 s = tostring(s);
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216 local len = #s;
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217 if len < 126 then
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218 conn:write("\x81" .. string.char(len) .. s);
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219 elseif len <= 0xffff then
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220 conn:write("\x81" .. string.char(126) .. string.char(len/0x100) .. string.char(len%0x100) .. s);
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221 else
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222 conn:write("\x81" .. string.char(127) .. string.char(len/0x100000000000000)
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223 .. string.char((len%0x100000000000000)/0x1000000000000) .. string.char((len%0x1000000000000)/0x10000000000)
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224 .. string.char((len%0x10000000000)/0x100000000) .. string.char((len%0x100000000)/0x1000000)
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225 .. string.char((len%0x1000000)/0x10000) .. string.char((len%0x10000)/0x100)
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226 .. string.char((len%0x100)))
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227 end
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228 end
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229
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230 if c2s_timeout then
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231 add_task(c2s_timeout, function ()
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232 if session.type == "c2s_unauthed" then
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233 session:close("connection-timeout");
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234 end
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235 end);
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236 end
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237
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238 session.dispatch_stanza = stream_callbacks.handlestanza;
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239 end
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240
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241 function listener.onincoming(conn, data)
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242 local session = sessions[conn];
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diff changeset
243 if session then
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244 session.data(data);
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245 else
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246 listener.onconnect(conn, data);
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247 session = sessions[conn];
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248 session.data(data);
129
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249 end
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250 end
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251
676
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252 function listener.ondisconnect(conn, err)
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253 local session = sessions[conn];
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254 if session then
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255 (session.log or log)("info", "Client disconnected: %s", err);
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256 sm_destroy_session(session, err);
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257 sessions[conn] = nil;
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258 session = nil;
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259 end
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260 end
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261
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262 function listener.associate_session(conn, session)
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263 sessions[conn] = session;
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264 end
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265
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266 function handle_request(event, path)
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267 local request, response = event.request, event.response;
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268
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269 -- Add sanity checks
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270
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271 response.conn:setlistener(listener);
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272 response.status = "101 Switching Protocols";
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273 response.headers.Upgrade = "websocket";
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274 response.headers.Connection = "Upgrade";
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275 response.headers.Sec_WebSocket_Accept = base64(sha1(request.headers.sec_websocket_key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"));
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276 response.headers.Sec_WebSocket_Protocol = "xmpp";
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277
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278 return "";
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279 end
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280
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281 function module.load()
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282 module:provides("http", {
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283 name = "xmpp-websocket";
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284 route = {
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285 ["GET /*"] = handle_request;
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286 };
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287 });
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288 end