Thu, 23 Oct 2008 17:34:10 +0100
even faster checking for other sessions... thank you waqas :)
30 | 1 | |
2 | -- The code in this file should be self-explanatory, though the logic is horrible | |
3 | -- for more info on that, see doc/stanza_routing.txt, which attempts to condense | |
4 | -- the rules from the RFCs (mainly 3921) | |
5 | ||
6 | require "core.servermanager" | |
7 | ||
8 | local log = require "util.logger".init("stanzarouter") | |
9 | ||
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10 | local st = require "util.stanza"; |
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11 | local send = require "core.sessionmanager".send_to_session; |
122 | 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 jid_split = require "util.jid".split; |
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16 | local print = print; |
30 | 17 | |
18 | function core_process_stanza(origin, stanza) | |
66 | 19 | log("debug", "Received: "..tostring(stanza)) |
73 | 20 | -- TODO verify validity of stanza (as well as JID validity) |
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21 | if stanza.name == "iq" and not(#stanza.tags == 1 and stanza.tags[1].attr.xmlns) then |
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22 | if stanza.attr.type == "set" or stanza.attr.type == "get" then |
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23 | error("Invalid IQ"); |
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24 | elseif #stanza.tags > 1 or not(stanza.attr.type == "error" or stanza.attr.type == "result") then |
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25 | error("Invalid IQ"); |
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26 | end |
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27 | end |
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28 | |
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29 | if origin.type == "c2s" and not origin.full_jid |
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30 | and not(stanza.name == "iq" and stanza.tags[1].name == "bind" |
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31 | and stanza.tags[1].attr.xmlns == "urn:ietf:params:xml:ns:xmpp-bind") then |
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32 | error("Client MUST bind resource after auth"); |
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33 | end |
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34 | |
30 | 35 | local to = stanza.attr.to; |
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36 | 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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37 | -- TODO also, stazas should be returned to their original state before the function ends |
30 | 38 | |
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39 | -- TODO presence subscriptions |
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40 | if not to then |
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41 | core_handle_stanza(origin, stanza); |
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42 | elseif hosts[to] and hosts[to].type == "local" then |
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43 | core_handle_stanza(origin, stanza); |
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44 | elseif stanza.name == "iq" and not select(3, jid_split(to)) then |
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45 | core_handle_stanza(origin, stanza); |
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46 | elseif origin.type == "c2s" then |
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47 | core_route_stanza(origin, stanza); |
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48 | end |
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49 | end |
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50 | |
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51 | -- This function handles stanzas which are not routed any further, |
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52 | -- that is, they are handled by this server |
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53 | function core_handle_stanza(origin, stanza) |
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54 | -- Handlers |
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55 | if origin.type == "c2s" or origin.type == "c2s_unauthed" then |
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56 | local session = origin; |
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57 | |
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58 | if stanza.name == "presence" and origin.roster then |
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59 | if stanza.attr.type == nil or stanza.attr.type == "available" or stanza.attr.type == "unavailable" then |
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60 | for jid in pairs(origin.roster) do -- broadcast to all interested contacts |
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61 | local subscription = origin.roster[jid].subscription; |
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62 | if subscription == "both" or subscription == "from" then |
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63 | stanza.attr.to = jid; |
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64 | core_route_stanza(origin, stanza); |
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65 | end |
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66 | end |
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67 | --[[local node, host = jid_split(stanza.attr.from); |
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68 | for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast to all resources |
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69 | if res.full_jid then |
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70 | res = user.sessions[k]; |
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71 | break; |
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72 | end |
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73 | end]] |
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74 | if not origin.presence then -- presence probes on initial presence |
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75 | local probe = st.presence({from = origin.full_jid, type = "probe"}); |
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76 | for jid in pairs(origin.roster) do |
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77 | local subscription = origin.roster[jid].subscription; |
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78 | if subscription == "both" or subscription == "to" then |
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79 | probe.attr.to = jid; |
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80 | core_route_stanza(origin, probe); |
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81 | end |
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82 | end |
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83 | end |
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84 | origin.presence = stanza; |
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85 | stanza.attr.to = nil; -- reset it |
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86 | else |
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87 | -- TODO error, bad type |
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88 | end |
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89 | else |
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90 | log("debug", "Routing stanza to local"); |
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91 | handle_stanza(session, stanza); |
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92 | end |
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93 | end |
30 | 94 | end |
95 | ||
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96 | function is_authorized_to_see_presence(origin, username, host) |
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97 | local roster = datamanager.load(username, host, "roster") or {}; |
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98 | local item = roster[origin.username.."@"..origin.host]; |
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99 | return item and (item.subscription == "both" or item.subscription == "from"); |
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100 | end |
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101 | |
30 | 102 | function core_route_stanza(origin, stanza) |
103 | -- Hooks | |
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104 | --- ...later |
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105 | |
30 | 106 | -- Deliver |
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107 | local to = stanza.attr.to; |
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108 | local node, host, resource = jid_split(to); |
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109 | |
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110 | if stanza.name == "presence" and stanza.attr.type == "probe" then resource = nil; end |
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111 | |
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112 | local host_session = hosts[host] |
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113 | if host_session and host_session.type == "local" then |
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114 | -- Local host |
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115 | local user = host_session.sessions[node]; |
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116 | if user then |
72 | 117 | local res = user.sessions[resource]; |
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118 | if not res then |
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119 | -- if we get here, resource was not specified or was unavailable |
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120 | if stanza.name == "presence" then |
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121 | if stanza.attr.type == "probe" then |
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122 | if is_authorized_to_see_presence(origin, node, host) then |
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123 | for k in pairs(user.sessions) do -- return presence for all resources |
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124 | if user.sessions[k].presence then |
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125 | local pres = user.sessions[k].presence; |
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126 | pres.attr.to = origin.full_jid; |
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127 | pres.attr.from = user.sessions[k].full_jid; |
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128 | send(origin, pres); |
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129 | pres.attr.to = nil; |
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130 | pres.attr.from = nil; |
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131 | end |
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132 | end |
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133 | else |
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134 | send(origin, st.presence({from = user.."@"..host, to = origin.username.."@"..origin.host, type = "unsubscribed"})); |
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135 | end |
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136 | else |
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137 | for k in pairs(user.sessions) do -- presence broadcast to all user resources |
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138 | if user.sessions[k].full_jid then |
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139 | stanza.attr.to = user.sessions[k].full_jid; |
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140 | send(user.sessions[k], stanza); |
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141 | end |
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142 | end |
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143 | end |
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144 | elseif stanza.name == "message" then -- select a resource to recieve message |
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145 | for k in pairs(user.sessions) do |
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146 | if user.sessions[k].full_jid then |
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147 | res = user.sessions[k]; |
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148 | break; |
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149 | end |
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150 | end |
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151 | -- TODO find resource with greatest priority |
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152 | send(res, stanza); |
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153 | else |
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154 | -- TODO send IQ error |
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155 | end |
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156 | else |
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157 | -- User + resource is online... |
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158 | stanza.attr.to = res.full_jid; |
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159 | send(res, stanza); -- Yay \o/ |
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160 | end |
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161 | else |
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162 | -- user not online |
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163 | if user_exists(node, host) then |
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164 | if stanza.name == "presence" then |
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165 | 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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166 | -- TODO send last recieved unavailable presence |
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167 | else |
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168 | -- TODO send unavailable presence |
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169 | end |
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170 | elseif stanza.name == "message" then |
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171 | -- TODO send message error, or store offline messages |
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172 | elseif stanza.name == "iq" then |
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173 | -- TODO send IQ error |
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174 | end |
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175 | else -- user does not exist |
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176 | -- 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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177 | if stanza.name == "presence" then |
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178 | if stanza.attr.type == "probe" then |
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179 | send(origin, st.presence({from = user.."@"..host, to = origin.username.."@"..origin.host, type = "unsubscribed"})); |
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180 | end |
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181 | -- else ignore |
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182 | else |
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183 | send(origin, st.error_reply(stanza, "cancel", "service-unavailable")); |
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184 | end |
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185 | end |
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186 | end |
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187 | else |
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188 | -- Remote host |
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189 | if host_session then |
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190 | -- Send to session |
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191 | else |
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192 | -- Need to establish the connection |
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193 | end |
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194 | end |
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195 | stanza.attr.to = to; -- reset |
30 | 196 | end |
197 | ||
198 | function handle_stanza_toremote(stanza) | |
199 | log("error", "Stanza bound for remote host, but s2s is not implemented"); | |
200 | end |