prosody
fbb3a4ff9cf1
core/stanza_router.lua

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core/stanza_router.lua @ 145:fbb3a4ff9cf1 s2s

dialback keys now verified
author Matthew Wild <mwild1@gmail.com>
date Fri, 24 Oct 2008 03:06:55 +0100
parent 144:ed78c1a0401e
child 146:3826ca244eb6
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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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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 format = string.format;
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17 local tostring = tostring;
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18
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19 local jid_split = require "util.jid".split;
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20 local print = print;
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21
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22 function core_process_stanza(origin, stanza)
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23 log("debug", "Received: "..tostring(stanza))
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24 -- TODO verify validity of stanza (as well as JID validity)
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25 if stanza.name == "iq" and not(#stanza.tags == 1 and stanza.tags[1].attr.xmlns) then
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26 if stanza.attr.type == "set" or stanza.attr.type == "get" then
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27 error("Invalid IQ");
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28 elseif #stanza.tags > 1 or not(stanza.attr.type == "error" or stanza.attr.type == "result") then
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29 error("Invalid IQ");
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30 end
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31 end
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33 if origin.type == "c2s" and not origin.full_jid
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34 and not(stanza.name == "iq" and stanza.tags[1].name == "bind"
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35 and stanza.tags[1].attr.xmlns == "urn:ietf:params:xml:ns:xmpp-bind") then
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36 error("Client MUST bind resource after auth");
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37 end
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38
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39 local to = stanza.attr.to;
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40 -- TODO also, stazas should be returned to their original state before the function ends
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41 if origin.type == "c2s" then
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42 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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43 end
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44
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45 if not to then
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46 core_handle_stanza(origin, stanza);
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47 elseif hosts[to] and hosts[to].type == "local" then
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48 core_handle_stanza(origin, stanza);
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49 elseif stanza.name == "iq" and not select(3, jid_split(to)) then
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50 core_handle_stanza(origin, stanza);
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51 elseif origin.type == "c2s" then
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52 core_route_stanza(origin, stanza);
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53 end
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54 end
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55
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56 -- This function handles stanzas which are not routed any further,
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57 -- that is, they are handled by this server
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58 function core_handle_stanza(origin, stanza)
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59 -- Handlers
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60 if origin.type == "c2s" or origin.type == "c2s_unauthed" then
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61 local session = origin;
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62
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63 if stanza.name == "presence" and origin.roster then
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64 if stanza.attr.type == nil or stanza.attr.type == "available" or stanza.attr.type == "unavailable" then
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65 for jid in pairs(origin.roster) do -- broadcast to all interested contacts
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66 local subscription = origin.roster[jid].subscription;
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67 if subscription == "both" or subscription == "from" then
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68 stanza.attr.to = jid;
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69 core_route_stanza(origin, stanza);
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70 end
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71 end
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72 --[[local node, host = jid_split(stanza.attr.from);
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73 for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast to all resources
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74 if res.full_jid then
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75 res = user.sessions[k];
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76 break;
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77 end
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78 end]]
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79 if not origin.presence then -- presence probes on initial presence
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80 local probe = st.presence({from = origin.full_jid, type = "probe"});
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81 for jid in pairs(origin.roster) do
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82 local subscription = origin.roster[jid].subscription;
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83 if subscription == "both" or subscription == "to" then
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84 probe.attr.to = jid;
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85 core_route_stanza(origin, probe);
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86 end
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87 end
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88 end
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89 origin.presence = stanza;
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90 stanza.attr.to = nil; -- reset it
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91 else
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92 -- TODO error, bad type
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93 end
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94 else
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95 log("debug", "Routing stanza to local");
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96 handle_stanza(session, stanza);
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97 end
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98 elseif origin.type == "s2sin_unauthed" then
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99 if stanza.name == "verify" and stanza.attr.xmlns == "jabber:server:dialback" then
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100 log("debug", "verifying dialback key...");
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101 local attr = stanza.attr;
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102 print(tostring(attr.to), tostring(attr.from))
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103 print(tostring(origin.to_host), tostring(origin.from_host))
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104 -- FIXME: Grr, ejabberd breaks this one too?? it is black and white in XEP-220 example 34
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105 --if attr.from ~= origin.to_host then error("invalid-from"); end
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106 local type = "invalid";
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107 if s2s_verify_dialback(attr.id, attr.from, attr.to, stanza[1]) then
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108 type = "valid"
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109 end
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110 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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111 end
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112 else
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113 log("warn", "Unhandled origin: %s", origin.type);
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114 end
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115 end
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116
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117 -- TODO: Does this function belong here?
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118 function is_authorized_to_see_presence(origin, username, host)
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119 local roster = datamanager.load(username, host, "roster") or {};
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120 local item = roster[origin.username.."@"..origin.host];
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121 return item and (item.subscription == "both" or item.subscription == "from");
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122 end
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123
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124 function core_route_stanza(origin, stanza)
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125 -- Hooks
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126 --- ...later
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127
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128 -- Deliver
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129 local to = stanza.attr.to;
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130 local node, host, resource = jid_split(to);
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131
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132 if stanza.name == "presence" and stanza.attr.type == "probe" then resource = nil; end
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133
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134 local host_session = hosts[host]
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135 if host_session and host_session.type == "local" then
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136 -- Local host
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137 local user = host_session.sessions[node];
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138 if user then
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139 local res = user.sessions[resource];
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140 if not res then
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141 -- if we get here, resource was not specified or was unavailable
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142 if stanza.name == "presence" then
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143 if stanza.attr.type == "probe" then
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144 if is_authorized_to_see_presence(origin, node, host) then
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145 for k in pairs(user.sessions) do -- return presence for all resources
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146 if user.sessions[k].presence then
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147 local pres = user.sessions[k].presence;
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148 pres.attr.to = origin.full_jid;
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149 pres.attr.from = user.sessions[k].full_jid;
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150 send(origin, pres);
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151 pres.attr.to = nil;
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152 pres.attr.from = nil;
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153 end
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154 end
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155 else
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156 send(origin, st.presence({from = user.."@"..host, to = origin.username.."@"..origin.host, type = "unsubscribed"}));
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157 end
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158 else
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159 for k in pairs(user.sessions) do -- presence broadcast to all user resources
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160 if user.sessions[k].full_jid then
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161 stanza.attr.to = user.sessions[k].full_jid;
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162 send(user.sessions[k], stanza);
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163 end
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164 end
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165 end
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166 elseif stanza.name == "message" then -- select a resource to recieve message
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167 for k in pairs(user.sessions) do
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168 if user.sessions[k].full_jid then
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169 res = user.sessions[k];
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170 break;
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171 end
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172 end
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173 -- TODO find resource with greatest priority
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174 send(res, stanza);
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175 else
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176 -- TODO send IQ error
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177 end
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178 else
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179 -- User + resource is online...
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180 stanza.attr.to = res.full_jid;
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181 send(res, stanza); -- Yay \o/
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182 end
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183 else
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184 -- user not online
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185 if user_exists(node, host) then
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186 if stanza.name == "presence" then
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187 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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188 -- TODO send last recieved unavailable presence
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189 else
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190 -- TODO send unavailable presence
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191 end
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192 elseif stanza.name == "message" then
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193 -- TODO send message error, or store offline messages
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194 elseif stanza.name == "iq" then
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195 -- TODO send IQ error
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196 end
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197 else -- user does not exist
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198 -- 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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199 if stanza.name == "presence" then
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200 if stanza.attr.type == "probe" then
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201 send(origin, st.presence({from = user.."@"..host, to = origin.username.."@"..origin.host, type = "unsubscribed"}));
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202 end
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203 -- else ignore
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204 else
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205 send(origin, st.error_reply(stanza, "cancel", "service-unavailable"));
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206 end
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207 end
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208 end
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209 else
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210 -- Remote host
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211 send_s2s(origin.host, host, stanza);
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212 end
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213 stanza.attr.to = to; -- reset
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214 end
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215
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216 function handle_stanza_toremote(stanza)
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217 log("error", "Stanza bound for remote host, but s2s is not implemented");
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218 end