prosody
e41a6ea7fc0f
net/xmppclient_listener.lua

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net/xmppclient_listener.lua @ 2167:e41a6ea7fc0f

xmppclient_listener: Escape control characters when logging invalid XML.
author Waqas Hussain <waqas20@gmail.com>
date Tue, 24 Nov 2009 22:42:08 +0500
parent 2077:e33658f6052c
child 2170:2abca9cc78b1
child 2816:59dfb99831ae
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2009 Matthew Wild
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3 -- Copyright (C) 2008-2009 Waqas Hussain
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4 --
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b1885732e979 GPL->MIT!
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9
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10
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11 local logger = require "logger";
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12 local log = logger.init("xmppclient_listener");
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13 local lxp = require "lxp"
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14 local init_xmlhandlers = require "core.xmlhandlers"
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15 local sm_new_session = require "core.sessionmanager".new_session;
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16
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17 local connlisteners_register = require "net.connlisteners".register;
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18
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19 local t_insert = table.insert;
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20 local t_concat = table.concat;
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21 local t_concatall = function (t, sep) local tt = {}; for _, s in ipairs(t) do t_insert(tt, tostring(s)); end return t_concat(tt, sep); end
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22 local m_random = math.random;
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23 local format = string.format;
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24 local sessionmanager = require "core.sessionmanager";
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25 local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session;
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26 local sm_streamopened = sessionmanager.streamopened;
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27 local sm_streamclosed = sessionmanager.streamclosed;
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28 local st = require "util.stanza";
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30 local stream_callbacks = { stream_tag = "http://etherx.jabber.org/streams\1stream",
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31 default_ns = "jabber:client",
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32 streamopened = sm_streamopened, streamclosed = sm_streamclosed, handlestanza = core_process_stanza };
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33
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34 function stream_callbacks.error(session, error, data)
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35 if error == "no-stream" then
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36 session.log("debug", "Invalid opening stream header");
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37 session:close("invalid-namespace");
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38 elseif session.close then
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39 (session.log or log)("debug", "Client XML parse error: %s", tostring(error));
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40 session:close("xml-not-well-formed");
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41 end
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42 end
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43
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44 local function handleerr(err) log("error", "Traceback[c2s]: %s: %s", tostring(err), debug.traceback()); end
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45 function stream_callbacks.handlestanza(a, b)
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46 xpcall(function () core_process_stanza(a, b) end, handleerr);
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47 end
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48
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49 local sessions = {};
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50 local xmppclient = { default_port = 5222, default_mode = "*a" };
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51
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52 -- These are session methods --
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53
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54 local function session_reset_stream(session)
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55 -- Reset stream
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56 local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "\1");
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57 session.parser = parser;
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58
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59 session.notopen = true;
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60
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61 function session.data(conn, data)
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62 local ok, err = parser:parse(data);
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63 if ok then return; end
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64 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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65 session:close("xml-not-well-formed");
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66 end
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67
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68 return true;
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69 end
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72 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
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73 local default_stream_attr = { ["xmlns:stream"] = stream_callbacks.stream_tag:match("[^\1]*"), xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
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74 local function session_close(session, reason)
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75 local log = session.log or log;
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76 if session.conn then
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77 if session.notopen then
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78 session.send("<?xml version='1.0'?>");
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79 session.send(st.stanza("stream:stream", default_stream_attr):top_tag());
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80 end
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81 if reason then
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82 if type(reason) == "string" then -- assume stream error
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83 log("info", "Disconnecting client, <stream:error> is: %s", reason);
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84 session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
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85 elseif type(reason) == "table" then
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86 if reason.condition then
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87 local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
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88 if reason.text then
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89 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
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90 end
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91 if reason.extra then
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92 stanza:add_child(reason.extra);
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93 end
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94 log("info", "Disconnecting client, <stream:error> is: %s", tostring(stanza));
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95 session.send(stanza);
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96 elseif reason.name then -- a stanza
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97 log("info", "Disconnecting client, <stream:error> is: %s", tostring(reason));
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98 session.send(reason);
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99 end
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100 end
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101 end
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102 session.send("</stream:stream>");
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103 session.conn.close();
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104 xmppclient.disconnect(session.conn, (reason and (reason.text or reason.condition)) or reason or "session closed");
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105 end
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106 end
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107
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108
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109 -- End of session methods --
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110
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111 function xmppclient.listener(conn, data)
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112 local session = sessions[conn];
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113 if not session then
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114 session = sm_new_session(conn);
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115 sessions[conn] = session;
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116
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117 session.log("info", "Client connected");
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118
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119 -- Client is using legacy SSL (otherwise mod_tls sets this flag)
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120 if conn.ssl() then
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121 session.secure = true;
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122 end
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123
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124 session.reset_stream = session_reset_stream;
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125 session.close = session_close;
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126
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127 session_reset_stream(session); -- Initialise, ready for use
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128
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129 session.dispatch_stanza = stream_callbacks.handlestanza;
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130 end
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131 if data then
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132 session.data(conn, data);
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133 end
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134 end
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135
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136 function xmppclient.disconnect(conn, err)
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137 local session = sessions[conn];
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138 if session then
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139 (session.log or log)("info", "Client disconnected: %s", err);
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140 sm_destroy_session(session, err);
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141 sessions[conn] = nil;
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142 session = nil;
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143 collectgarbage("collect");
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144 end
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145 end
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146
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147 connlisteners_register("xmppclient", xmppclient);