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annotate mod_websocket/mod_websocket.lua @ 840:f568661c9d39

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mod_websocket: Fix frame length calculation
author Florian Zeitz <florob@babelmonkeys.de>
date Thu, 04 Oct 2012 16:38:39 +0200
parents d297d76010d4
children 32df4d13f178
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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
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24 local xpcall, tostring, type = xpcall, tostring, type;
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25 local traceback = debug.traceback;
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26
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27 local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
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28
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29 local log = module._log;
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30
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31 local c2s_timeout = module:get_option_number("c2s_timeout");
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32 local stream_close_timeout = module:get_option_number("c2s_close_timeout", 5);
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33 local opt_keepalives = module:get_option_boolean("tcp_keepalives", false);
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34 local self_closing_stream = module:get_option_boolean("websocket_self_closing_stream", true);
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35
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36 local sessions = module:shared("sessions");
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37 local core_process_stanza = prosody.core_process_stanza;
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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 -- Websocket helpers
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43 local function parse_frame(frame)
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44 local result = {};
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45 local pos = 1;
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46 local length_bytes = 0;
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47 local counter = 0;
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48 local tmp_byte;
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49
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50 tmp_byte = string.byte(frame, pos);
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51 result.FIN = band(tmp_byte, 0x80) > 0;
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52 result.RSV1 = band(tmp_byte, 0x40) > 0;
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53 result.RSV2 = band(tmp_byte, 0x20) > 0;
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54 result.RSV3 = band(tmp_byte, 0x10) > 0;
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55 result.opcode = band(tmp_byte, 0x0F);
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56
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57 pos = pos + 1;
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58 tmp_byte = string.byte(frame, pos);
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59 result.MASK = band(tmp_byte, 0x80) > 0;
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60 result.length = band(tmp_byte, 0x7F);
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61
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62 if result.length == 126 then
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63 length_bytes = 2;
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64 result.length = 0;
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65 elseif result.length == 127 then
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66 length_bytes = 8;
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67 result.length = 0;
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68 end
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69
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70 for i = 1, length_bytes do
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71 pos = pos + 1;
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72 result.length = result.length * 256 + string.byte(frame, pos);
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73 end
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74
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75 if result.MASK then
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76 result.key = {string.byte(frame, pos+1), string.byte(frame, pos+2),
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77 string.byte(frame, pos+3), string.byte(frame, pos+4)}
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78
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79 pos = pos + 5;
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80 result.data = "";
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81 for i = pos, pos + result.length - 1 do
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82 result.data = result.data .. string.char(bxor(result.key[counter+1], string.byte(frame, i)));
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83 counter = (counter + 1) % 4;
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84 end
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85 else
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86 result.data = frame:sub(pos + 1, pos + result.length);
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87 end
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88
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89 return result;
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90 end
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91
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92 local function build_frame(desc)
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93 local length;
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94 local result = "";
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95
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96 result = result .. string.char(0x80 * (desc.FIN and 1 or 0) + desc.opcode);
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97
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98 length = #desc.data;
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99 if length <= 125 then -- 7-bit length
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100 result = result .. string.char(length);
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101 elseif length <= 0xFFFF then -- 2-byte length
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102 result = result .. string.char(126);
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103 result = result .. string.char(length/0x100) .. string.char(length%0x100);
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104 else -- 8-byte length
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105 result = result .. string.char(127);
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106 for i = 7, 0, -1 do
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107 result = result .. string.char(( length / (2^(8*i)) ) % 0x100);
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108 end
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109 end
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110
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111 result = result .. desc.data;
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112
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113 return result;
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114 end
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115
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116 --- Stream events handlers
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117 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
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118 local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
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119
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120 function stream_callbacks.streamopened(session, attr)
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121 local send = session.send;
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122 session.host = nameprep(attr.to);
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123 if not session.host then
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124 session:close{ condition = "improper-addressing",
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125 text = "A valid 'to' attribute is required on stream headers" };
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126 return;
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127 end
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128 session.version = tonumber(attr.version) or 0;
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129 session.streamid = uuid_generate();
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130 (session.log or session)("debug", "Client sent opening <stream:stream> to %s", session.host);
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131
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132 if not hosts[session.host] then
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133 -- We don't serve this host...
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134 session:close{ condition = "host-unknown", text = "This server does not serve "..tostring(session.host)};
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135 return;
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136 end
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137
677
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138 -- COMPAT: Current client implementations need this to be self-closing
692
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139 if self_closing_stream then
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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' })));
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143 else
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144 send("<?xml version='1.0'?>"..st.stanza("stream:stream", {
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145 xmlns = 'jabber:client', ["xmlns:stream"] = 'http://etherx.jabber.org/streams';
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146 id = session.streamid, from = session.host, version = '1.0', ["xml:lang"] = 'en' }):top_tag());
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147 end
676
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148
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149 (session.log or log)("debug", "Sent reply <stream:stream> to client");
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150 session.notopen = nil;
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151
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152 -- If session.secure is *false* (not nil) then it means we /were/ encrypting
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153 -- since we now have a new stream header, session is secured
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154 if session.secure == false then
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155 session.secure = true;
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156 end
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157
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158 local features = st.stanza("stream:features");
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159 hosts[session.host].events.fire_event("stream-features", { origin = session, features = features });
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160 module:fire_event("stream-features", session, features);
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161
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162 send(features);
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163 end
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164
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165 function stream_callbacks.streamclosed(session)
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166 session.log("debug", "Received </stream:stream>");
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167 session:close(false);
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168 end
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169
129
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170 function stream_callbacks.error(session, error, data)
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171 if error == "no-stream" then
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172 session.log("debug", "Invalid opening stream header");
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173 session:close("invalid-namespace");
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174 elseif error == "parse-error" then
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175 (session.log or log)("debug", "Client XML parse error: %s", tostring(data));
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176 session:close("not-well-formed");
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177 elseif error == "stream-error" then
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178 local condition, text = "undefined-condition";
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179 for child in data:children() do
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180 if child.attr.xmlns == xmlns_xmpp_streams then
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181 if child.name ~= "text" then
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182 condition = child.name;
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183 else
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184 text = child:get_text();
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185 end
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186 if condition ~= "undefined-condition" and text then
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187 break;
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188 end
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189 end
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190 end
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191 text = condition .. (text and (" ("..text..")") or "");
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192 session.log("info", "Session closed by remote with error: %s", text);
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193 session:close(nil, text);
129
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194 end
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195 end
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196
676
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197 local function handleerr(err) log("error", "Traceback[c2s]: %s: %s", tostring(err), traceback()); end
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198 function stream_callbacks.handlestanza(session, stanza)
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199 stanza = session.filter("stanzas/in", stanza);
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200 if stanza then
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201 return xpcall(function () return core_process_stanza(session, stanza) end, handleerr);
129
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202 end
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203 end
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204
676
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205 --- Session methods
129
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206 local function session_close(session, reason)
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207 local log = session.log or log;
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208 if session.conn then
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209 if session.notopen then
692
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210 -- COMPAT: Current client implementations need this to be self-closing
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211 if self_closing_stream then
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212 session.send("<?xml version='1.0'?>"..tostring(st.stanza("stream:stream", default_stream_attr)));
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213 else
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214 session.send("<?xml version='1.0'?>"..st.stanza("stream:stream", default_stream_attr):top_tag());
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215 end
129
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216 end
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217 if reason then -- nil == no err, initiated by us, false == initiated by client
129
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218 if type(reason) == "string" then -- assume stream error
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219 log("debug", "Disconnecting client, <stream:error> is: %s", reason);
129
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220 session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
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221 elseif type(reason) == "table" then
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222 if reason.condition then
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223 local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
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224 if reason.text then
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225 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
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226 end
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227 if reason.extra then
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228 stanza:add_child(reason.extra);
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229 end
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230 log("debug", "Disconnecting client, <stream:error> is: %s", tostring(stanza));
129
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231 session.send(stanza);
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232 elseif reason.name then -- a stanza
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233 log("debug", "Disconnecting client, <stream:error> is: %s", tostring(reason));
129
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234 session.send(reason);
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235 end
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236 end
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237 end
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238 session.send("</stream:stream>");
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239 function session.send() return false; end
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240
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241 local reason = (reason and (reason.text or reason.condition)) or reason;
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242 session.log("info", "c2s stream for %s closed: %s", session.full_jid or ("<"..session.ip..">"), reason or "session closed");
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243
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244 -- Authenticated incoming stream may still be sending us stanzas, so wait for </stream:stream> from remote
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245 local conn = session.conn;
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246 if reason == nil and not session.notopen and session.type == "c2s" then
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247 -- Grace time to process data from authenticated cleanly-closed stream
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248 add_task(stream_close_timeout, function ()
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249 if not session.destroyed then
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250 session.log("warn", "Failed to receive a stream close response, closing connection anyway...");
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diff changeset
251 sm_destroy_session(session, reason);
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252 conn:close();
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253 end
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254 end);
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255 else
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diff changeset
256 sm_destroy_session(session, reason);
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257 conn:close();
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258 end
129
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259 end
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parents:
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260 end
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261
839
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262 module:hook_global("user-deleted", function(event)
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263 local username, host = event.username, event.host;
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264 local user = hosts[host].sessions[username];
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265 if user and user.sessions then
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266 for jid, session in pairs(user.sessions) do
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267 session:close{ condition = "not-authorized", text = "Account deleted" };
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268 end
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269 end
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270 end, 200);
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271
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272 --- Port listener
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273 function listener.onconnect(conn)
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274 local session = sm_new_session(conn);
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275 sessions[conn] = session;
129
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276
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277 session.log("info", "Client connected");
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278
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279 -- Client is using legacy SSL (otherwise mod_tls sets this flag)
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280 if conn:ssl() then
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281 session.secure = true;
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282 end
129
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283
676
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284 if opt_keepalives then
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285 conn:setoption("keepalive", opt_keepalives);
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286 end
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287
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288 session.close = session_close;
129
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289
676
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diff changeset
290 local stream = new_xmpp_stream(session, stream_callbacks);
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291 session.stream = stream;
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292 session.notopen = true;
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diff changeset
293
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diff changeset
294 function session.reset_stream()
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295 session.notopen = true;
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296 session.stream:reset();
129
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297 end
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298
676
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diff changeset
299 local filter = session.filter;
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300 local buffer = "";
676
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diff changeset
301 function session.data(data)
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302 local frame = parse_frame(data);
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303
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parents: 689
diff changeset
304 module:log("debug", "Websocket received: %s (%i bytes)", frame.data, #frame.data);
691
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parents: 690
diff changeset
305 if frame.opcode == 0x0 or frame.opcode == 0x1 then -- Text or continuation frame
690
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306 buffer = buffer .. frame.data;
691
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diff changeset
307 elseif frame.opcode == 0x9 then -- Ping frame
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diff changeset
308 frame.opcode = 0xA;
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309 conn:write(build_frame(frame));
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310 return;
690
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311 else
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312 log("warn", "Received frame with unsupported opcode %i", frame.opcode);
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313 return;
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diff changeset
314 end
676
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315
690
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316 if frame.FIN then
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317 data = buffer;
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318 buffer = "";
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319
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320 -- COMPAT: Current client implementations send a self-closing <stream:stream>
692
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321 if self_closing_stream then
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parents: 692
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322 data = data:gsub("(<stream:stream.*)/>$", "%1>");
692
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323 end
690
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diff changeset
324
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325 data = filter("bytes/in", data);
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diff changeset
326 if data then
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diff changeset
327 local ok, err = stream:feed(data);
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328 if ok then return; end
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329 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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330 session:close("not-well-formed");
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parents: 689
diff changeset
331 end
676
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diff changeset
332 end
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parents: 129
diff changeset
333 end
129
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parents:
diff changeset
334
676
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diff changeset
335 function session.send(s)
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parents: 677
diff changeset
336 conn:write(build_frame({ FIN = true, opcode = 0x01, data = tostring(s)}));
676
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diff changeset
337 end
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parents: 129
diff changeset
338
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diff changeset
339 if c2s_timeout then
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diff changeset
340 add_task(c2s_timeout, function ()
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341 if session.type == "c2s_unauthed" then
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diff changeset
342 session:close("connection-timeout");
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diff changeset
343 end
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parents: 129
diff changeset
344 end);
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diff changeset
345 end
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parents: 129
diff changeset
346
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parents: 129
diff changeset
347 session.dispatch_stanza = stream_callbacks.handlestanza;
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diff changeset
348 end
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diff changeset
349
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diff changeset
350 function listener.onincoming(conn, data)
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diff changeset
351 local session = sessions[conn];
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diff changeset
352 if session then
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diff changeset
353 session.data(data);
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parents: 129
diff changeset
354 else
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diff changeset
355 listener.onconnect(conn, data);
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diff changeset
356 session = sessions[conn];
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diff changeset
357 session.data(data);
129
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parents:
diff changeset
358 end
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parents:
diff changeset
359 end
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parents:
diff changeset
360
676
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diff changeset
361 function listener.ondisconnect(conn, err)
129
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parents:
diff changeset
362 local session = sessions[conn];
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parents:
diff changeset
363 if session then
839
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diff changeset
364 (session.log or log)("info", "Client disconnected: %s", err or "connection closed");
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diff changeset
365 sm_destroy_session(session, err);
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parents: 129
diff changeset
366 sessions[conn] = nil;
129
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parents:
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367 end
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parents:
diff changeset
368 end
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parents:
diff changeset
369
676
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diff changeset
370 function listener.associate_session(conn, session)
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diff changeset
371 sessions[conn] = session;
129
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parents:
diff changeset
372 end
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parents:
diff changeset
373
676
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diff changeset
374 function handle_request(event, path)
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diff changeset
375 local request, response = event.request, event.response;
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diff changeset
376
689
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parents: 688
diff changeset
377 if not request.headers.sec_websocket_key then
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parents: 688
diff changeset
378 response.headers.content_type = "text/html";
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parents: 688
diff changeset
379 return [[<!DOCTYPE html><html><head><title>Websocket</title></head><body>
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parents: 688
diff changeset
380 <p>It works! Now point your WebSocket client to this URL to connect to Prosody.</p>
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parents: 688
diff changeset
381 </body></html>]];
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parents: 688
diff changeset
382 end
676
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diff changeset
383
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diff changeset
384 response.conn:setlistener(listener);
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diff changeset
385 response.status = "101 Switching Protocols";
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386 response.headers.Upgrade = "websocket";
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387 response.headers.Connection = "Upgrade";
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388 response.headers.Sec_WebSocket_Accept = base64(sha1(request.headers.sec_websocket_key .. "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"));
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389 response.headers.Sec_WebSocket_Protocol = "xmpp";
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390
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391 return "";
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392 end
676
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393
688
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394 function module.add_host(module)
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395 module:depends("http");
676
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396 module:provides("http", {
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397 name = "xmpp-websocket";
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398 route = {
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399 ["GET /*"] = handle_request;
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400 };
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401 });
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402 end