prosody
e7bff9cfbb65
core/stanza_router.lua

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core/stanza_router.lua @ 170:e7bff9cfbb65

Minor fixes, comments
author Waqas Hussain <waqas20@gmail.com>
date Sat, 25 Oct 2008 01:48:34 +0500
parent 160:018c7f5ef0ea
child 171:28f420d057a0
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1
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2 -- The code in this file should be self-explanatory, though the logic is horrible
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3 -- for more info on that, see doc/stanza_routing.txt, which attempts to condense
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4 -- the rules from the RFCs (mainly 3921)
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5
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6 require "core.servermanager"
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7
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8 local log = require "util.logger".init("stanzarouter")
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9
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10 local st = require "util.stanza";
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11 local send = require "core.sessionmanager".send_to_session;
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12 local send_s2s = require "core.s2smanager".send_to_host;
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13 local user_exists = require "core.usermanager".user_exists;
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14
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15 local s2s_verify_dialback = require "core.s2smanager".verify_dialback;
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16 local s2s_make_authenticated = require "core.s2smanager".make_authenticated;
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17 local format = string.format;
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18 local tostring = tostring;
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19
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20 local jid_split = require "util.jid".split;
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21 local print = print;
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23 function core_process_stanza(origin, stanza)
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24 log("debug", "Received: "..tostring(stanza))
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25 -- TODO verify validity of stanza (as well as JID validity)
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26 if stanza.name == "iq" and not(#stanza.tags == 1 and stanza.tags[1].attr.xmlns) then
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27 if stanza.attr.type == "set" or stanza.attr.type == "get" then
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28 error("Invalid IQ");
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29 elseif #stanza.tags > 1 and not(stanza.attr.type == "error" or stanza.attr.type == "result") then
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30 error("Invalid IQ");
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31 end
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32 end
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34 if origin.type == "c2s" and not origin.full_jid
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35 and not(stanza.name == "iq" and stanza.tags[1].name == "bind"
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36 and stanza.tags[1].attr.xmlns == "urn:ietf:params:xml:ns:xmpp-bind") then
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37 error("Client MUST bind resource after auth");
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38 end
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39
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40 local to = stanza.attr.to;
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41 -- TODO also, stazas should be returned to their original state before the function ends
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42 if origin.type == "c2s" then
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43 stanza.attr.from = origin.full_jid; -- quick fix to prevent impersonation (FIXME this would be incorrect when the origin is not c2s)
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44 end
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46 if not to then
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47 core_handle_stanza(origin, stanza);
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48 elseif hosts[to] and hosts[to].type == "local" then
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49 core_handle_stanza(origin, stanza);
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50 elseif stanza.name == "iq" and not select(3, jid_split(to)) then
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51 core_handle_stanza(origin, stanza);
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52 elseif origin.type == "c2s" or origin.type == "s2sin" then
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53 core_route_stanza(origin, stanza);
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54 end
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55 end
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56
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57 -- This function handles stanzas which are not routed any further,
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58 -- that is, they are handled by this server
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59 function core_handle_stanza(origin, stanza)
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60 -- Handlers
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61 if origin.type == "c2s" or origin.type == "c2s_unauthed" then
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62 local session = origin;
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63
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64 if stanza.name == "presence" and origin.roster then
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65 if stanza.attr.type == nil or stanza.attr.type == "unavailable" then
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66 for jid in pairs(origin.roster) do -- broadcast to all interested contacts
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67 local subscription = origin.roster[jid].subscription;
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68 if subscription == "both" or subscription == "from" then
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69 stanza.attr.to = jid;
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70 core_route_stanza(origin, stanza);
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71 end
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72 end
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73 local node, host = jid_split(stanza.attr.from);
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74 for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast to all resources
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75 if res ~= origin and res.full_jid then -- to resource. FIXME is res.full_jid the correct check? Maybe it should be res.presence
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76 stanza.attr.to = res.full_jid;
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77 core_route_stanza(origin, stanza);
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78 end
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79 end
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80 if not origin.presence then -- presence probes on initial presence
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81 local probe = st.presence({from = origin.full_jid, type = "probe"});
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82 for jid in pairs(origin.roster) do -- probe all contacts we are subscribed to
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83 local subscription = origin.roster[jid].subscription;
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84 if subscription == "both" or subscription == "to" then
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85 probe.attr.to = jid;
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86 core_route_stanza(origin, probe);
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87 end
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88 end
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89 for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast from all resources
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90 if res ~= origin and stanza.attr.type ~= "unavailable" and res.presence then -- FIXME does unavailable qualify as initial presence?
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91 res.presence.attr.to = origin.full_jid;
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92 core_route_stanza(res, res.presence);
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93 res.presence.attr.to = nil;
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94 end
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95 end
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96 -- TODO resend subscription requests
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97 end
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98 origin.presence = stanza;
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99 stanza.attr.to = nil; -- reset it
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100 else
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101 -- TODO error, bad type
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102 end
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103 else
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104 log("debug", "Routing stanza to local");
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105 handle_stanza(session, stanza);
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106 end
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107 elseif origin.type == "s2sin_unauthed" or origin.type == "s2sin" then
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108 if stanza.attr.xmlns == "jabber:server:dialback" then
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109 if stanza.name == "verify" then
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110 -- We are being asked to verify the key, to ensure it was generated by us
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111 log("debug", "verifying dialback key...");
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112 local attr = stanza.attr;
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113 print(tostring(attr.to), tostring(attr.from))
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114 print(tostring(origin.to_host), tostring(origin.from_host))
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115 -- FIXME: Grr, ejabberd breaks this one too?? it is black and white in XEP-220 example 34
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116 --if attr.from ~= origin.to_host then error("invalid-from"); end
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117 local type = "invalid";
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118 if s2s_verify_dialback(attr.id, attr.from, attr.to, stanza[1]) then
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119 type = "valid"
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120 end
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121 origin.send(format("<db:verify from='%s' to='%s' id='%s' type='%s'>%s</db:verify>", attr.to, attr.from, attr.id, type, stanza[1]));
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122 elseif stanza.name == "result" and origin.type == "s2sin_unauthed" then
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123 -- he wants to be identified through dialback
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124 -- We need to check the key with the Authoritative server
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125 local attr = stanza.attr;
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126 origin.from_host = attr.from;
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127 origin.to_host = attr.to;
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128 origin.dialback_key = stanza[1];
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129 log("debug", "asking %s if key %s belongs to them", attr.from, stanza[1]);
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130 send_s2s(attr.to, attr.from, format("<db:verify from='%s' to='%s' id='%s'>%s</db:verify>", attr.to, attr.from, origin.streamid, stanza[1]));
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131 hosts[attr.from].dialback_verifying = origin;
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132 end
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133 end
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134 elseif origin.type == "s2sout_unauthed" or origin.type == "s2sout" then
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135 if stanza.attr.xmlns == "jabber:server:dialback" then
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136 if stanza.name == "result" then
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137 if stanza.attr.type == "valid" then
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138 s2s_make_authenticated(origin);
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139 else
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140 -- FIXME
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141 error("dialback failed!");
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142 end
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143 elseif stanza.name == "verify" and origin.dialback_verifying then
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144 local valid;
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145 local attr = stanza.attr;
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146 if attr.type == "valid" then
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147 s2s_make_authenticated(origin.dialback_verifying);
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148 valid = "valid";
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149 else
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150 -- Warn the original connection that is was not verified successfully
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151 log("warn", "dialback for "..(origin.dialback_verifying.from_host or "(unknown)").." failed");
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152 valid = "invalid";
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153 end
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154 origin.dialback_verifying.send(format("<db:result from='%s' to='%s' id='%s' type='%s'>%s</db:result>", attr.from, attr.to, attr.id, valid, origin.dialback_verifying.dialback_key));
146
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155 end
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156 end
145
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157 else
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158 log("warn", "Unhandled origin: %s", origin.type);
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159 end
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160 end
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161
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162 function is_authorized_to_see_presence(origin, username, host)
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163 local roster = datamanager.load(username, host, "roster") or {};
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164 local item = roster[origin.username.."@"..origin.host];
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165 return item and (item.subscription == "both" or item.subscription == "from");
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166 end
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167
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168 function core_route_stanza(origin, stanza)
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169 -- Hooks
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170 --- ...later
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171
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172 -- Deliver
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173 local to = stanza.attr.to;
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174 local node, host, resource = jid_split(to);
170
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175 local to_bare = node and (node.."@"..host) or host; -- bare JID
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176 local from = stanza.attr.from;
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177 local from_node, from_host, from_resource = jid_split(from);
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178 local from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID
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179
151
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180 if stanza.name == "presence" and (stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable") then resource = nil; end
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181
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182 local host_session = hosts[host]
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183 if host_session and host_session.type == "local" then
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184 -- Local host
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185 local user = host_session.sessions[node];
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186 if user then
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187 local res = user.sessions[resource];
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188 if not res then
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189 -- if we get here, resource was not specified or was unavailable
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190 if stanza.name == "presence" then
151
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191 if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then
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192 if stanza.attr.type == "probe" then
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193 if is_authorized_to_see_presence(origin, node, host) then
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194 for k in pairs(user.sessions) do -- return presence for all resources
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195 local pres = user.sessions[k].presence;
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196 if pres then
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197 pres.attr.to = from; -- FIXME use from_bare?
151
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198 pres.attr.from = user.sessions[k].full_jid;
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199 send(origin, pres);
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200 pres.attr.to = nil;
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201 pres.attr.from = nil;
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202 end
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203 end
151
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204 else
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205 send(origin, st.presence({from=to_bare, to=origin.username.."@"..origin.host, type="unsubscribed"}));
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206 end
151
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207 elseif stanza.attr.type == "subscribe" then
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208 -- TODO
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209 elseif stanza.attr.type == "unsubscribe" then
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210 -- TODO
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211 elseif stanza.attr.type == "subscribed" then
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212 -- TODO
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213 -- sender.roster[recipient.bare_jid]. subscription = from or both
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214 -- sender.rosterpush recipient
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215 -- send presence for all sender resources to recipient.bare_jid
151
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216 elseif stanza.attr.type == "unsubscribed" then
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217 -- TODO
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218 end -- discard any other type
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219 else -- sender is available or unavailable
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220 for k in pairs(user.sessions) do -- presence broadcast to all user resources
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221 if user.sessions[k].full_jid then
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222 stanza.attr.to = user.sessions[k].full_jid; -- reset at the end of function
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223 send(user.sessions[k], stanza);
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224 end
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225 end
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226 end
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227 elseif stanza.name == "message" then -- select a resource to recieve message
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228 for k in pairs(user.sessions) do
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229 if user.sessions[k].full_jid then
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230 res = user.sessions[k];
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231 break;
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232 end
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233 end
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234 -- TODO find resource with greatest priority
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235 send(res, stanza);
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236 else
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237 -- TODO send IQ error
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238 end
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239 else
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240 -- User + resource is online...
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241 stanza.attr.to = res.full_jid; -- reset at the end of function
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242 send(res, stanza); -- Yay \o/
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243 end
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244 else
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245 -- user not online
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246 if user_exists(node, host) then
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247 if stanza.name == "presence" then
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248 if stanza.attr.type == "probe" and is_authorized_to_see_presence(origin, node, host) then -- FIXME what to do for not c2s?
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249 -- TODO send last recieved unavailable presence (or we MAY do nothing, which is fine too)
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250 else
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251 -- TODO send unavailable presence
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252 end
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253 elseif stanza.name == "message" then
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254 -- TODO send message error, or store offline messages
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diff changeset
255 elseif stanza.name == "iq" then
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diff changeset
256 -- TODO send IQ error
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diff changeset
257 end
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258 else -- user does not exist
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259 -- TODO we would get here for nodeless JIDs too. Do something fun maybe? Echo service? Let plugins use xmpp:server/resource addresses?
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260 if stanza.name == "presence" then
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diff changeset
261 if stanza.attr.type == "probe" then
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diff changeset
262 send(origin, st.presence({from = to_bare, to = from_bare, type = "unsubscribed"}));
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diff changeset
263 end
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diff changeset
264 -- else ignore
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diff changeset
265 else
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diff changeset
266 send(origin, st.error_reply(stanza, "cancel", "service-unavailable"));
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267 end
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diff changeset
268 end
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diff changeset
269 end
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270 elseif origin.type == "c2s" then
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271 -- Remote host
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272 local xmlns = stanza.attr.xmlns;
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273 --stanza.attr.xmlns = "jabber:server";
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274 stanza.attr.xmlns = nil;
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275 log("debug", "sending s2s stanza: %s", tostring(stanza));
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diff changeset
276 send_s2s(origin.host, host, stanza); -- TODO handle remote routing errors
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diff changeset
277 stanza.attr.xmlns = xmlns; -- reset
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diff changeset
278 else
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diff changeset
279 log("warn", "received stanza from unhandled connection type: %s", origin.type);
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diff changeset
280 end
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281 stanza.attr.to = to; -- reset
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282 end
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283
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284 function handle_stanza_toremote(stanza)
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285 log("error", "Stanza bound for remote host, but s2s is not implemented");
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286 end