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30
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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 require "util.jid"
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11 local jid_split = jid.split;
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12
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13 function core_process_stanza(origin, stanza)
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66
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14 log("debug", "Received: "..tostring(stanza))
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30
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15 local to = stanza.attr.to;
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16
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17 if not to or (hosts[to] and hosts[to].type == "local") then
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18 core_handle_stanza(origin, stanza);
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19 elseif origin.type == "c2s" then
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20 core_route_stanza(origin, stanza);
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21 end
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22
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23 end
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24
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25 function core_handle_stanza(origin, stanza)
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26 -- Handlers
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27 if origin.type == "c2s" or origin.type == "c2s_unauthed" then
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28 local session = origin;
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29 stanza.attr.from = session.full_jid;
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30
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31 log("debug", "Routing stanza");
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32 -- Stanza has no to attribute
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33 --local to_node, to_host, to_resource = jid_split(stanza.attr.to);
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34 --if not to_host then error("Invalid destination JID: "..string.format("{ %q, %q, %q } == %q", to_node or "", to_host or "", to_resource or "", stanza.attr.to or "nil")); end
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35
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36 -- Stanza is to this server, or a user on this server
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37 log("debug", "Routing stanza to local");
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38 handle_stanza(session, stanza);
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39 end
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40 end
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41
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42 function core_route_stanza(origin, stanza)
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43 -- Hooks
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44 -- Deliver
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45 end
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46
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47 function handle_stanza_nodest(stanza)
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48 if stanza.name == "iq" then
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49 handle_stanza_iq_no_to(session, stanza);
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50 elseif stanza.name == "presence" then
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51 -- Broadcast to this user's contacts
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52 handle_stanza_presence_broadcast(session, stanza);
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53 -- also, if it is initial presence, send out presence probes
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54 if not session.last_presence then
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55 handle_stanza_presence_probe_broadcast(session, stanza);
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56 end
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57 session.last_presence = stanza;
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58 elseif stanza.name == "message" then
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59 -- Treat as if message was sent to bare JID of the sender
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60 handle_stanza_to_local_user(stanza);
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61 end
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62 end
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63
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64 function handle_stanza_tolocal(stanza)
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65 local node, host, resource = jid.split(stanza.attr.to);
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66 if host and hosts[host] and hosts[host].type == "local" then
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67 -- Is a local host, handle internally
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68 if node then
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69 -- Is a local user, send to their session
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70 log("debug", "Routing stanza to %s@%s", node, host);
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71 if not session.username then return; end --FIXME: Correct response when trying to use unauthed stream is what?
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72 handle_stanza_to_local_user(stanza);
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73 else
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74 -- Is sent to this server, let's handle it...
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75 log("debug", "Routing stanza to %s", host);
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76 handle_stanza_to_server(stanza, session);
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77 end
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78 end
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79 end
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80
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81 function handle_stanza_toremote(stanza)
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82 log("error", "Stanza bound for remote host, but s2s is not implemented");
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83 end
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84
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85
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86 --[[
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87 local function route_c2s_stanza(session, stanza)
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88 stanza.attr.from = session.full_jid;
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89 if not stanza.attr.to and session.username then
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90 -- Has no 'to' attribute, handle internally
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91 if stanza.name == "iq" then
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92 handle_stanza_iq_no_to(session, stanza);
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93 elseif stanza.name == "presence" then
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94 -- Broadcast to this user's contacts
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95 handle_stanza_presence_broadcast(session, stanza);
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96 -- also, if it is initial presence, send out presence probes
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97 if not session.last_presence then
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98 handle_stanza_presence_probe_broadcast(session, stanza);
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99 end
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100 session.last_presence = stanza;
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101 elseif stanza.name == "message" then
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102 -- Treat as if message was sent to bare JID of the sender
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103 handle_stanza_to_local_user(stanza);
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104 end
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105 end
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106 local node, host, resource = jid.split(stanza.attr.to);
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107 if host and hosts[host] and hosts[host].type == "local" then
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108 -- Is a local host, handle internally
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109 if node then
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110 -- Is a local user, send to their session
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111 if not session.username then return; end --FIXME: Correct response when trying to use unauthed stream is what?
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112 handle_stanza_to_local_user(stanza);
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113 else
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114 -- Is sent to this server, let's handle it...
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115 handle_stanza_to_server(stanza, session);
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116 end
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117 else
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118 -- Is not for us or a local user, route accordingly
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119 route_s2s_stanza(stanza);
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120 end
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121 end
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122
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123 function handle_stanza_no_to(session, stanza)
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124 if not stanza.attr.id then log("warn", "<iq> without id attribute is invalid"); end
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125 local xmlns = (stanza.tags[1].attr and stanza.tags[1].attr.xmlns);
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126 if stanza.attr.type == "get" or stanza.attr.type == "set" then
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127 if iq_handlers[xmlns] then
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128 if iq_handlers[xmlns](stanza) then return; end; -- If handler returns true, it handled it
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129 end
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130 -- Oh, handler didn't handle it. Need to send service-unavailable now.
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131 log("warn", "Unhandled namespace: "..xmlns);
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132 session:send(format("<iq type='error' id='%s'><error type='cancel'><service-unavailable/></error></iq>", stanza.attr.id));
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133 return; -- All done!
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134 end
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135 end
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136
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137 function handle_stanza_to_local_user(stanza)
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138 if stanza.name == "message" then
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139 handle_stanza_message_to_local_user(stanza);
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140 elseif stanza.name == "presence" then
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141 handle_stanza_presence_to_local_user(stanza);
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142 elseif stanza.name == "iq" then
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143 handle_stanza_iq_to_local_user(stanza);
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144 end
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145 end
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146
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147 function handle_stanza_message_to_local_user(stanza)
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148 local node, host, resource = stanza.to.node, stanza.to.host, stanza.to.resource;
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149 local destuser = hosts[host].sessions[node];
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150 if destuser then
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151 if resource and destuser[resource] then
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152 destuser[resource]:send(stanza);
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153 else
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154 -- Bare JID, or resource offline
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155 local best_session;
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156 for resource, session in pairs(destuser.sessions) do
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157 if not best_session then best_session = session;
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158 elseif session.priority >= best_session.priority and session.priority >= 0 then
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159 best_session = session;
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160 end
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161 end
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162 if not best_session then
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163 offlinemessage.new(node, host, stanza);
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164 else
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165 print("resource '"..resource.."' was not online, have chosen to send to '"..best_session.username.."@"..best_session.host.."/"..best_session.resource.."'");
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166 destuser[best_session]:send(stanza);
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167 end
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168 end
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169 else
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170 -- User is offline
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171 offlinemessage.new(node, host, stanza);
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172 end
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173 end
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174
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175 function handle_stanza_presence_to_local_user(stanza)
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176 local node, host, resource = stanza.to.node, stanza.to.host, stanza.to.resource;
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177 local destuser = hosts[host].sessions[node];
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178 if destuser then
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179 if resource then
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180 if destuser[resource] then
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181 destuser[resource]:send(stanza);
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182 else
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183 return;
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184 end
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185 else
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186 -- Broadcast to all user's resources
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187 for resource, session in pairs(destuser.sessions) do
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188 session:send(stanza);
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189 end
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190 end
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191 end
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192 end
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193
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194 function handle_stanza_iq_to_local_user(stanza)
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195
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196 end
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197
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198 function foo()
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199 local node, host, resource = stanza.to.node, stanza.to.host, stanza.to.resource;
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200 local destuser = hosts[host].sessions[node];
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201 if destuser and destuser.sessions then
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202 -- User online
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203 if resource and destuser.sessions[resource] then
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204 stanza.to:send(stanza);
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205 else
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206 --User is online, but specified resource isn't (or no resource specified)
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207 local best_session;
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208 for resource, session in pairs(destuser.sessions) do
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209 if not best_session then best_session = session;
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210 elseif session.priority >= best_session.priority and session.priority >= 0 then
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211 best_session = session;
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212 end
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213 end
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214 if not best_session then
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215 offlinemessage.new(node, host, stanza);
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216 else
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217 print("resource '"..resource.."' was not online, have chosen to send to '"..best_session.username.."@"..best_session.host.."/"..best_session.resource.."'");
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218 resource = best_session.resource;
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219 end
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220 end
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221 if destuser.sessions[resource] == session then
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222 log("warn", "core", "Attempt to send stanza to self, dropping...");
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223 else
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224 print("...sending...", tostring(stanza));
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225 --destuser.sessions[resource].conn.write(tostring(data));
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226 print(" to conn ", destuser.sessions[resource].conn);
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227 destuser.sessions[resource].conn.write(tostring(stanza));
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228 print("...sent")
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229 end
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230 elseif stanza.name == "message" then
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231 print(" ...will be stored offline");
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232 offlinemessage.new(node, host, stanza);
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233 elseif stanza.name == "iq" then
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234 print(" ...is an iq");
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235 stanza.from:send(st.reply(stanza)
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236 :tag("error", { type = "cancel" })
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237 :tag("service-unavailable", { xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas" }));
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238 end
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239 end
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240
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241 -- Broadcast a presence stanza to all of a user's contacts
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242 function handle_stanza_presence_broadcast(session, stanza)
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243 if session.roster then
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244 local initial_presence = not session.last_presence;
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245 session.last_presence = stanza;
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246
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247 -- Broadcast presence and probes
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248 local broadcast = st.presence({ from = session.full_jid, type = stanza.attr.type });
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249
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250 for child in stanza:childtags() do
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251 broadcast:add_child(child);
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252 end
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253 for contact_jid in pairs(session.roster) do
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254 broadcast.attr.to = contact_jid;
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255 send_to(contact_jid, broadcast);
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256 if initial_presence then
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257 local node, host = jid.split(contact_jid);
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258 if hosts[host] and hosts[host].type == "local" then
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259 local contact = hosts[host].sessions[node]
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260 if contact then
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261 local pres = st.presence { to = session.full_jid };
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262 for resource, contact_session in pairs(contact.sessions) do
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263 if contact_session.last_presence then
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264 pres.tags = contact_session.last_presence.tags;
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265 pres.attr.from = contact_session.full_jid;
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266 send(pres);
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267 end
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268 end
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269 end
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270 --FIXME: Do we send unavailable if they are offline?
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271 else
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272 probe.attr.to = contact;
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273 send_to(contact, probe);
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274 end
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275 end
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276 end
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277
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278 -- Probe for our contacts' presence
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279 end
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280 end
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281
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282 -- Broadcast presence probes to all of a user's contacts
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283 function handle_stanza_presence_probe_broadcast(session, stanza)
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284 end
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285
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286 --
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287 function handle_stanza_to_server(stanza)
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288 end
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289
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290 function handle_stanza_iq_no_to(session, stanza)
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291 end
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292 ]] |
