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annotate mod_websocket/mod_websocket.lua @ 687:d141375ece4b

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mod_websocket: Move frame building into a function
author Florian Zeitz <florob@babelmonkeys.de>
date Sun, 27 May 2012 17:09:19 +0200
parents eeb41cd5e9f3
children e87678a52720
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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 band = require "bit".band;
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22 local bxor = require "bit".bxor;
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23 local tohex = require "bit".tohex;
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25 module:depends("http")
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28 local xpcall, tostring, type = xpcall, tostring, type;
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29 local traceback = debug.traceback;
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30
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31 local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
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32
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33 local log = module._log;
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34
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35 local c2s_timeout = module:get_option_number("c2s_timeout");
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36 local opt_keepalives = module:get_option_boolean("tcp_keepalives", false);
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37
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38 local sessions = module:shared("sessions");
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39
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40 local stream_callbacks = { default_ns = "jabber:client", handlestanza = core_process_stanza };
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41 local listener = {};
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42
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43 -- Websocket helpers
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44 local function parse_frame(frame)
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45 local result = {};
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46 local pos = 1;
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47 local length_bytes = 0;
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48 local counter = 0;
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49 local tmp_byte;
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50
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51 tmp_byte = string.byte(frame, pos);
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52 result.FIN = band(tmp_byte, 0x80) > 0;
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53 result.RSV1 = band(tmp_byte, 0x40) > 0;
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54 result.RSV2 = band(tmp_byte, 0x20) > 0;
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55 result.RSV3 = band(tmp_byte, 0x10) > 0;
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56 result.opcode = band(tmp_byte, 0x0F) > 0;
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57
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58 pos = pos + 1;
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59 tmp_byte = string.byte(frame, pos);
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60 result.MASK = band(tmp_byte, 0x80) > 0;
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61 result.length = band(tmp_byte, 0x7F);
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62
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63 if result.length == 126 then
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64 length_bytes = 2;
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65 result.length = 0;
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66 elseif result.length == 127 then
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67 length_bytes = 8;
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68 result.length = 0;
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69 end
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70
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71 for i = 1, length_bytes do
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72 pos = pos + 1;
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73 result.length = result.length * 255 + string.byte(frame, pos);
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74 end
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75
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76 if result.MASK then
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77 result.key = {string.byte(frame, pos+1), string.byte(frame, pos+2),
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78 string.byte(frame, pos+3), string.byte(frame, pos+4)}
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79
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80 pos = pos + 5;
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81 result.data = "";
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82 for i = pos, pos + result.length - 1 do
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83 result.data = result.data .. string.char(bxor(result.key[counter+1], string.byte(frame, i)));
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84 counter = (counter + 1) % 4;
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85 end
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86 else
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87 result.data = frame:sub(pos + 1, pos + result.length);
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88 end
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89
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90 return result;
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91 end
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92
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93 local function build_frame(desc)
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94 local length;
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95 local result = "";
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96
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97 result = result .. string.char(0x80 * (desc.FIN and 1 or 0) + desc.opcode);
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98
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99 length = #desc.data;
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100 if length <= 125 then -- 7-bit length
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101 result = result .. string.char(length);
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102 elseif length <= 0xFFFF then -- 2-byte length
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103 result = result .. string.char(126);
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104 result = result .. string.char(length/0x100) .. string.char(length%0x100);
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105 else -- 8-byte length
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106 result = result .. string.char(127);
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107 for i = 7, 0, -1 do
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108 result = result .. string.char(( length / (2^(8*i)) ) % 0x100);
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109 end
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110 end
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111
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112 result = result .. desc.data;
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113
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114 return result;
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115 end
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116
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117 --- Stream events handlers
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118 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
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119 local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
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120
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121 function stream_callbacks.streamopened(session, attr)
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122 local send = session.send;
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123 session.host = nameprep(attr.to);
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124 if not session.host then
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125 session:close{ condition = "improper-addressing",
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126 text = "A valid 'to' attribute is required on stream headers" };
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127 return;
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128 end
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129 session.version = tonumber(attr.version) or 0;
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130 session.streamid = uuid_generate();
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131 (session.log or session)("debug", "Client sent opening <stream:stream> to %s", session.host);
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132
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133 if not hosts[session.host] then
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134 -- We don't serve this host...
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135 session:close{ condition = "host-unknown", text = "This server does not serve "..tostring(session.host)};
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136 return;
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137 end
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138
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139 -- COMPAT: Current client implementations need this to be self-closing
676
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140 send("<?xml version='1.0'?>"..(tostring(st.stanza("stream:stream", {
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141 xmlns = 'jabber:client', ["xmlns:stream"] = 'http://etherx.jabber.org/streams';
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142 id = session.streamid, from = session.host, version = '1.0', ["xml:lang"] = 'en' }):top_tag()):gsub(">", "/>")));
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143
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144 (session.log or log)("debug", "Sent reply <stream:stream> to client");
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145 session.notopen = nil;
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146
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147 -- If session.secure is *false* (not nil) then it means we /were/ encrypting
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148 -- since we now have a new stream header, session is secured
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149 if session.secure == false then
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150 session.secure = true;
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151 end
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152
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153 local features = st.stanza("stream:features");
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154 hosts[session.host].events.fire_event("stream-features", { origin = session, features = features });
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155 module:fire_event("stream-features", session, features);
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156
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157 send(features);
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158 end
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159
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160 function stream_callbacks.streamclosed(session)
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161 session.log("debug", "Received </stream:stream>");
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162 session:close();
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163 end
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164
129
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165 function stream_callbacks.error(session, error, data)
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166 if error == "no-stream" then
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167 session.log("debug", "Invalid opening stream header");
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168 session:close("invalid-namespace");
676
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169 elseif error == "parse-error" then
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170 (session.log or log)("debug", "Client XML parse error: %s", tostring(data));
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171 session:close("not-well-formed");
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172 elseif error == "stream-error" then
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173 local condition, text = "undefined-condition";
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174 for child in data:children() do
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175 if child.attr.xmlns == xmlns_xmpp_streams then
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176 if child.name ~= "text" then
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177 condition = child.name;
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178 else
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179 text = child:get_text();
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180 end
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181 if condition ~= "undefined-condition" and text then
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182 break;
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183 end
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184 end
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185 end
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186 text = condition .. (text and (" ("..text..")") or "");
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187 session.log("info", "Session closed by remote with error: %s", text);
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188 session:close(nil, text);
129
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189 end
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190 end
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191
676
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192 local function handleerr(err) log("error", "Traceback[c2s]: %s: %s", tostring(err), traceback()); end
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193 function stream_callbacks.handlestanza(session, stanza)
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194 stanza = session.filter("stanzas/in", stanza);
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195 if stanza then
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196 return xpcall(function () return core_process_stanza(session, stanza) end, handleerr);
129
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197 end
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198 end
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199
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200 --- Session methods
129
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201 local function session_close(session, reason)
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202 local log = session.log or log;
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203 if session.conn then
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204 if session.notopen then
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205 session.send("<?xml version='1.0'?>");
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206 session.send(st.stanza("stream:stream", default_stream_attr):top_tag());
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207 end
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208 if reason then
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parents:
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209 if type(reason) == "string" then -- assume stream error
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210 log("info", "Disconnecting client, <stream:error> is: %s", reason);
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211 session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
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212 elseif type(reason) == "table" then
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213 if reason.condition then
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214 local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
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215 if reason.text then
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216 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
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217 end
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parents:
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218 if reason.extra then
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parents:
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219 stanza:add_child(reason.extra);
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220 end
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parents:
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221 log("info", "Disconnecting client, <stream:error> is: %s", tostring(stanza));
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diff changeset
222 session.send(stanza);
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parents:
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223 elseif reason.name then -- a stanza
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224 log("info", "Disconnecting client, <stream:error> is: %s", tostring(reason));
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225 session.send(reason);
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226 end
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parents:
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227 end
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parents:
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228 end
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229 session.send("</stream:stream>");
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230 session.conn:close();
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diff changeset
231 listener.ondisconnect(session.conn, (reason and (reason.text or reason.condition)) or reason or "session closed");
129
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232 end
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parents:
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233 end
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234
676
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diff changeset
235 --- Port listener
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236 function listener.onconnect(conn)
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diff changeset
237 local session = sm_new_session(conn);
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diff changeset
238 sessions[conn] = session;
129
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239
676
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240 session.log("info", "Client connected");
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241
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242 -- Client is using legacy SSL (otherwise mod_tls sets this flag)
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diff changeset
243 if conn:ssl() then
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244 session.secure = true;
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245 end
129
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246
676
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diff changeset
247 if opt_keepalives then
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248 conn:setoption("keepalive", opt_keepalives);
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249 end
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250
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251 session.close = session_close;
129
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252
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253 local stream = new_xmpp_stream(session, stream_callbacks);
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254 session.stream = stream;
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255 session.notopen = true;
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256
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257 function session.reset_stream()
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258 session.notopen = true;
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259 session.stream:reset();
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260 end
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261
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262 local filter = session.filter;
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263 function session.data(data)
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264 data = parse_frame(data).data;
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265 module:log("debug", "Websocket received: %s %i", data, #data)
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266 -- COMPAT: Current client implementations send a self-closing <stream:stream>
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267 data = data:gsub("/>$", ">");
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268
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269 data = filter("bytes/in", data);
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270 if data then
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271 local ok, err = stream:feed(data);
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272 if ok then return; end
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273 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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274 session:close("not-well-formed");
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275 end
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276 end
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277
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278 function session.send(s)
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279 conn:write(build_frame({ FIN = true, opcode = 0x01, data = tostring(s)}));
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280 end
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281
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282 if c2s_timeout then
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283 add_task(c2s_timeout, function ()
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284 if session.type == "c2s_unauthed" then
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285 session:close("connection-timeout");
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286 end
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287 end);
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288 end
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289
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290 session.dispatch_stanza = stream_callbacks.handlestanza;
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291 end
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292
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293 function listener.onincoming(conn, data)
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294 local session = sessions[conn];
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295 if session then
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296 session.data(data);
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297 else
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298 listener.onconnect(conn, data);
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299 session = sessions[conn];
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300 session.data(data);
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301 end
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302 end
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303
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304 function listener.ondisconnect(conn, err)
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305 local session = sessions[conn];
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306 if session then
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307 (session.log or log)("info", "Client disconnected: %s", err);
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308 sm_destroy_session(session, err);
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309 sessions[conn] = nil;
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310 session = nil;
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311 end
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312 end
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313
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314 function listener.associate_session(conn, session)
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315 sessions[conn] = session;
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316 end
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317
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318 function handle_request(event, path)
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319 local request, response = event.request, event.response;
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320
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321 -- Add sanity checks
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322
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323 response.conn:setlistener(listener);
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324 response.status = "101 Switching Protocols";
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325 response.headers.Upgrade = "websocket";
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326 response.headers.Connection = "Upgrade";
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327 response.headers.Sec_WebSocket_Accept = base64(sha1(request.headers.sec_websocket_key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"));
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328 response.headers.Sec_WebSocket_Protocol = "xmpp";
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329
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330 return "";
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331 end
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332
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333 function module.load()
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334 module:provides("http", {
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335 name = "xmpp-websocket";
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336 route = {
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337 ["GET /*"] = handle_request;
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338 };
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339 });
129
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340 end