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core/s2smanager.lua @ 1805:7e41ad68fe3c
core.s2smanager: Don't recurse CNAMEs infinitely :)
| author | Matthew Wild <mwild1@gmail.com> |
|---|---|
| date | Mon, 21 Sep 2009 14:40:14 +0100 |
| parent | 1796:5f7b2f940816 |
| child | 1806:c55e06eb53b2 |
| child | 1828:48cb27e2716e |
| rev | line source |
|---|---|
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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 -- |
| 758 | 5 -- This project is MIT/X11 licensed. Please see the |
| 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 |
| 148 | 10 |
| 11 local hosts = hosts; | |
| 12 local sessions = sessions; | |
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13 local core_process_stanza = function(a, b) core_process_stanza(a, b); end |
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14 local add_task = require "util.timer".add_task; |
| 148 | 15 local socket = require "socket"; |
| 16 local format = string.format; | |
| 337 | 17 local t_insert, t_sort = table.insert, table.sort; |
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18 local get_traceback = debug.traceback; |
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19 local tostring, pairs, ipairs, getmetatable, newproxy, error, tonumber |
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20 = tostring, pairs, ipairs, getmetatable, newproxy, error, tonumber; |
| 148 | 21 |
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(Basic) IDNA and SRV fallback support
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22 local idna_to_ascii = require "util.encodings".idna.to_ascii; |
| 148 | 23 local connlisteners_get = require "net.connlisteners".get; |
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24 local wrapclient = require "net.server".wrapclient; |
| 148 | 25 local modulemanager = require "core.modulemanager"; |
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26 local st = require "stanza"; |
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27 local stanza = st.stanza; |
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Fixed: s2smanager: Apply nameprep on hostnames passed in stream tag (part of issue #57)
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28 local nameprep = require "util.encodings".stringprep.nameprep; |
| 148 | 29 |
| 30 local uuid_gen = require "util.uuid".generate; | |
| 31 | |
| 32 local logger_init = require "util.logger".init; | |
| 33 | |
| 34 local log = logger_init("s2smanager"); | |
| 35 | |
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36 local sha256_hash = require "util.hashes".sha256; |
| 148 | 37 |
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s2smanager: Use a UUID as the dialback secret
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38 local dialback_secret = uuid_gen(); |
| 148 | 39 |
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s2smanager: Compatibility with domains which use CNAMEs
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40 local adns, dns = require "net.adns", require "net.dns"; |
| 974 | 41 |
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42 local connect_timeout = config.get("*", "core", "s2s_timeout") or 60; |
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43 local dns_timeout = config.get("*", "core", "dns_timeout") or 60; |
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core.s2smanager: Don't recurse CNAMEs infinitely :)
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44 local max_dns_depth = config.get("*", "core", "dns_max_depth") or 3; |
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45 |
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46 incoming_s2s = {}; |
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47 local incoming_s2s = incoming_s2s; |
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48 |
| 148 | 49 module "s2smanager" |
| 50 | |
| 337 | 51 local function compare_srv_priorities(a,b) return a.priority < b.priority or a.weight < b.weight; end |
| 52 | |
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53 local function bounce_sendq(session) |
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54 local sendq = session.sendq; |
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55 if sendq then |
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s2smanager: Miscellaneous logging improvements, changing levels, improving messages and using session loggers where possible
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56 session.log("info", "sending error replies for "..#sendq.." queued stanzas because of failed outgoing connection to "..tostring(session.to_host)); |
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57 local dummy = { |
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58 type = "s2sin"; |
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59 send = function(s) |
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60 (session.log or log)("error", "Replying to to an s2s error reply, please report this! Traceback: %s", get_traceback()); |
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61 end; |
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62 dummy = true; |
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63 }; |
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64 for i, data in ipairs(sendq) do |
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65 local reply = data[2]; |
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66 local xmlns = reply.attr.xmlns; |
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67 if not xmlns or xmlns == "jabber:client" or xmlns == "jabber:server" then |
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68 reply.attr.type = "error"; |
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69 reply:tag("error", {type = "cancel"}) |
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70 :tag("remote-server-not-found", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up(); |
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71 core_process_stanza(dummy, reply); |
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72 end |
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73 sendq[i] = nil; |
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74 end |
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75 session.sendq = nil; |
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76 end |
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77 end |
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78 |
| 148 | 79 function send_to_host(from_host, to_host, data) |
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80 local host = hosts[from_host].s2sout[to_host]; |
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81 if host then |
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82 -- We have a connection to this host already |
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83 if host.type == "s2sout_unauthed" and data.name ~= "db:verify" and ((not data.xmlns) or data.xmlns == "jabber:client" or data.xmlns == "jabber:server") then |
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84 (host.log or log)("debug", "trying to send over unauthed s2sout to "..to_host); |
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85 if not host.notopen and not host.dialback_key and host.sends2s then |
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86 host.log("debug", "dialback had not been initiated"); |
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87 initiate_dialback(host); |
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88 end |
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89 |
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90 -- Queue stanza until we are able to send it |
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91 if host.sendq then t_insert(host.sendq, {tostring(data), st.reply(data)}); |
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92 else host.sendq = { {tostring(data), st.reply(data)} }; end |
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93 host.log("debug", "stanza [%s] queued ", data.name); |
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94 elseif host.type == "local" or host.type == "component" then |
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95 log("error", "Trying to send a stanza to ourselves??") |
| 256 | 96 log("error", "Traceback: %s", get_traceback()); |
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97 log("error", "Stanza: %s", tostring(data)); |
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98 else |
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99 (host.log or log)("debug", "going to send stanza to "..to_host.." from "..from_host); |
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100 -- FIXME |
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101 if host.from_host ~= from_host then |
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102 log("error", "WARNING! This might, possibly, be a bug, but it might not..."); |
| 331 | 103 log("error", "We are going to send from %s instead of %s", tostring(host.from_host), tostring(from_host)); |
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104 end |
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105 host.sends2s(data); |
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106 host.log("debug", "stanza sent over "..host.type); |
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107 end |
| 148 | 108 else |
| 109 log("debug", "opening a new outgoing connection for this stanza"); | |
| 110 local host_session = new_outgoing(from_host, to_host); | |
| 111 -- Store in buffer | |
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112 host_session.sendq = { {tostring(data), st.reply(data)} }; |
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113 log("debug", "stanza [%s] queued until connection complete", tostring(data.name)); |
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114 if (not host_session.connecting) and (not host_session.conn) then |
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115 log("warn", "Connection to %s failed already, destroying session...", to_host); |
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116 destroy_session(host_session); |
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117 end |
| 148 | 118 end |
| 119 end | |
| 120 | |
| 121 local open_sessions = 0; | |
| 122 | |
| 123 function new_incoming(conn) | |
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124 local session = { conn = conn, type = "s2sin_unauthed", direction = "incoming", hosts = {} }; |
| 148 | 125 if true then |
| 126 session.trace = newproxy(true); | |
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127 getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; end; |
| 148 | 128 end |
| 129 open_sessions = open_sessions + 1; | |
| 343 | 130 local w, log = conn.write, logger_init("s2sin"..tostring(conn):match("[a-f0-9]+$")); |
| 131 session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end | |
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132 incoming_s2s[session] = true; |
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133 add_task(connect_timeout, function () |
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134 if session.conn ~= conn or |
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135 session.type == "s2sin" then |
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136 return; -- Ok, we're connect[ed|ing] |
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137 end |
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138 -- Not connected, need to close session and clean up |
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139 (session.log or log)("warn", "Destroying incomplete session %s->%s due to inactivity", |
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140 session.from_host or "(unknown)", session.to_host or "(unknown)"); |
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141 session:close("connection-timeout"); |
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142 end); |
| 148 | 143 return session; |
| 144 end | |
| 145 | |
| 146 function new_outgoing(from_host, to_host) | |
| 147 local host_session = { to_host = to_host, from_host = from_host, notopen = true, type = "s2sout_unauthed", direction = "outgoing" }; | |
|
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148 hosts[from_host].s2sout[to_host] = host_session; |
| 148 | 149 |
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150 local log; |
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151 do |
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152 local conn_name = "s2sout"..tostring(host_session):match("[a-f0-9]*$"); |
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153 log = logger_init(conn_name); |
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154 host_session.log = log; |
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155 end |
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156 |
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157 -- This is the first call, can't fail (the first step is DNS lookup) |
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158 attempt_connection(host_session); |
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159 |
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160 if not host_session.sends2s then |
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161 -- A sends2s which buffers data (until the stream is opened) |
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162 -- note that data in this buffer will be sent before the stream is authed |
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163 -- and will not be ack'd in any way, successful or otherwise |
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164 local buffer; |
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165 function host_session.sends2s(data) |
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166 if not buffer then |
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167 buffer = {}; |
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168 host_session.send_buffer = buffer; |
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169 end |
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170 log("debug", "Buffering data on unconnected s2sout to %s", to_host); |
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171 buffer[#buffer+1] = data; |
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172 log("debug", "Buffered item %d: %s", #buffer, tostring(data)); |
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173 end |
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174 |
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175 end |
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176 |
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177 return host_session; |
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178 end |
|
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179 |
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180 |
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181 function attempt_connection(host_session, err) |
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182 local from_host, to_host = host_session.from_host, host_session.to_host; |
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183 local connect_host, connect_port = idna_to_ascii(to_host), 5269; |
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184 |
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185 if not err then -- This is our first attempt |
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186 log("debug", "First attempt to connect to %s, starting with SRV lookup...", to_host); |
| 974 | 187 host_session.connecting = true; |
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188 local handle; |
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189 handle = adns.lookup(function (answer) |
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190 handle = nil; |
| 974 | 191 host_session.connecting = nil; |
| 192 if answer then | |
| 193 log("debug", to_host.." has SRV records, handling..."); | |
| 194 local srv_hosts = {}; | |
| 195 host_session.srv_hosts = srv_hosts; | |
| 196 for _, record in ipairs(answer) do | |
| 197 t_insert(srv_hosts, record.srv); | |
| 198 end | |
| 199 t_sort(srv_hosts, compare_srv_priorities); | |
| 200 | |
| 201 local srv_choice = srv_hosts[1]; | |
| 202 host_session.srv_choice = 1; | |
| 203 if srv_choice then | |
| 204 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; | |
| 205 log("debug", "Best record found, will connect to %s:%d", connect_host, connect_port); | |
| 206 end | |
| 207 else | |
| 208 log("debug", to_host.." has no SRV records, falling back to A"); | |
| 337 | 209 end |
| 974 | 210 -- Try with SRV, or just the plain hostname if no SRV |
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211 local ok, err = try_connect(host_session, connect_host, connect_port); |
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212 if not ok then |
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213 if not attempt_connection(host_session, err) then |
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214 -- No more attempts will be made |
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215 destroy_session(host_session); |
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216 end |
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217 end |
| 974 | 218 end, "_xmpp-server._tcp."..connect_host..".", "SRV"); |
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219 |
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220 -- Set handler for DNS timeout |
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221 add_task(dns_timeout, function () |
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222 if handle then |
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223 adns.cancel(handle, true); |
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224 end |
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225 end); |
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226 |
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227 log("debug", "DNS lookup for %s sent, waiting for response before we can connect", to_host); |
| 974 | 228 return true; -- Attempt in progress |
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229 elseif host_session.srv_hosts and #host_session.srv_hosts > host_session.srv_choice then -- Not our first attempt, and we also have SRV |
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230 host_session.srv_choice = host_session.srv_choice + 1; |
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231 local srv_choice = host_session.srv_hosts[host_session.srv_choice]; |
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232 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; |
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233 host_session.log("info", "Connection failed (%s). Attempt #%d: This time to %s:%d", tostring(err), host_session.srv_choice, connect_host, connect_port); |
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234 else |
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235 host_session.log("info", "Out of connection options, can't connect to %s", tostring(host_session.to_host)); |
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236 -- We're out of options |
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237 return false; |
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238 end |
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239 |
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240 if not (connect_host and connect_port) then |
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241 -- Likely we couldn't resolve DNS |
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242 log("warn", "Hmm, we're without a host (%s) and port (%s) to connect to for %s, giving up :(", tostring(connect_host), tostring(connect_port), tostring(to_host)); |
|
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243 return false; |
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244 end |
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245 |
| 974 | 246 return try_connect(host_session, connect_host, connect_port); |
| 247 end | |
| 248 | |
| 249 function try_connect(host_session, connect_host, connect_port) | |
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250 host_session.connecting = true; |
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251 local handle; |
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252 handle = adns.lookup(function (reply) |
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253 handle = nil; |
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254 host_session.connecting = nil; |
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255 |
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256 -- COMPAT: This is a compromise for all you CNAME-(ab)users :) |
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257 if not (reply and reply[1] and reply[1].a) then |
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258 local count = max_dns_depth; |
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259 reply = dns.peek(connect_host, "CNAME", "IN"); |
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260 while count > 0 and reply and reply[1] and not reply[1].a and reply[1].cname do |
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261 log("debug", "Looking up %s (DNS depth is %d)", tostring(reply[1].cname), count); |
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262 reply = dns.peek(reply[1].cname, "A", "IN") or dns.peek(reply[1].cname, "CNAME", "IN"); |
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263 count = count - 1; |
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264 end |
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265 end |
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266 -- end of CNAME resolving |
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267 |
|
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268 if reply and reply[1] and reply[1].a then |
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269 log("debug", "DNS reply for %s gives us %s", connect_host, reply[1].a); |
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270 return make_connect(host_session, reply[1].a, connect_port); |
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271 else |
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272 log("debug", "DNS lookup failed to get a response for %s", connect_host); |
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273 if not attempt_connection(host_session, "name resolution failed") then -- Retry if we can |
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274 log("debug", "No other records to try for %s - destroying", host_session.to_host); |
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275 destroy_session(host_session); -- End of the line, we can't |
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276 end |
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277 end |
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278 end, connect_host, "A", "IN"); |
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279 |
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280 -- Set handler for DNS timeout |
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281 add_task(dns_timeout, function () |
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282 if handle then |
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283 adns.cancel(handle, true); |
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284 end |
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285 end); |
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286 |
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287 return true; |
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288 end |
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289 |
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290 function make_connect(host_session, connect_host, connect_port) |
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291 host_session.log("info", "Beginning new connection attempt to %s (%s:%d)", host_session.to_host, connect_host, connect_port); |
|
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292 -- Ok, we're going to try to connect |
| 974 | 293 |
| 294 local from_host, to_host = host_session.from_host, host_session.to_host; | |
| 295 | |
| 296 local conn, handler = socket.tcp() | |
| 297 | |
|
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298 conn:settimeout(0); |
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299 local success, err = conn:connect(connect_host, connect_port); |
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300 if not success and err ~= "timeout" then |
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301 log("warn", "s2s connect() to %s (%s:%d) failed: %s", host_session.to_host, connect_host, connect_port, err); |
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302 return false, err; |
|
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303 end |
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304 |
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305 local cl = connlisteners_get("xmppserver"); |
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306 conn = wrapclient(conn, connect_host, connect_port, cl, cl.default_mode or 1, hosts[from_host].ssl_ctx, false ); |
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307 host_session.conn = conn; |
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308 |
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309 -- Register this outgoing connection so that xmppserver_listener knows about it |
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310 -- otherwise it will assume it is a new incoming connection |
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311 cl.register_outgoing(conn, host_session); |
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312 |
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313 local w = conn.write; |
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314 host_session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end |
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315 |
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316 conn.write(format([[<stream:stream xmlns='jabber:server' xmlns:db='jabber:server:dialback' xmlns:stream='http://etherx.jabber.org/streams' from='%s' to='%s' version='1.0' xml:lang='en'>]], from_host, to_host)); |
| 974 | 317 log("debug", "Connection attempt in progress..."); |
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318 add_task(connect_timeout, function () |
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319 if host_session.conn ~= conn or |
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320 host_session.type == "s2sout" or |
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321 host_session.connecting then |
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322 return; -- Ok, we're connect[ed|ing] |
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323 end |
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324 -- Not connected, need to close session and clean up |
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325 (host_session.log or log)("warn", "Destroying incomplete session %s->%s due to inactivity", |
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326 host_session.from_host or "(unknown)", host_session.to_host or "(unknown)"); |
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327 host_session:close("connection-timeout"); |
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328 end); |
|
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329 return true; |
| 148 | 330 end |
| 331 | |
| 332 function streamopened(session, attr) | |
|
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333 local send = session.sends2s; |
| 148 | 334 |
|
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335 -- TODO: #29: SASL/TLS on s2s streams |
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336 session.version = 0; --tonumber(attr.version) or 0; |
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337 |
| 148 | 338 if session.version >= 1.0 and not (attr.to and attr.from) then |
| 339 log("warn", (session.to_host or "(unknown)").." failed to specify 'to' or 'from' hostname as per RFC"); | |
| 340 end | |
| 341 | |
| 342 if session.direction == "incoming" then | |
| 343 -- Send a reply stream header | |
|
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344 session.to_host = attr.to and nameprep(attr.to); |
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345 session.from_host = attr.from and nameprep(attr.from); |
| 148 | 346 |
| 347 session.streamid = uuid_gen(); | |
|
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348 (session.log or log)("debug", "incoming s2s received <stream:stream>"); |
| 148 | 349 send("<?xml version='1.0'?>"); |
|
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350 send(stanza("stream:stream", { xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback', |
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351 ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.to_host }):top_tag()); |
| 331 | 352 if session.to_host and not hosts[session.to_host] then |
| 353 -- Attempting to connect to a host we don't serve | |
|
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354 session:close({ condition = "host-unknown"; text = "This host does not serve "..session.to_host }); |
| 331 | 355 return; |
| 356 end | |
|
345
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357 if session.version >= 1.0 then |
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358 send(st.stanza("stream:features") |
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359 :tag("dialback", { xmlns='urn:xmpp:features:dialback' }):tag("optional"):up():up()); |
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360 end |
| 148 | 361 elseif session.direction == "outgoing" then |
| 362 -- If we are just using the connection for verifying dialback keys, we won't try and auth it | |
|
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363 if not attr.id then error("stream response did not give us a streamid!!!"); end |
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364 session.streamid = attr.id; |
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365 |
|
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366 -- Send unauthed buffer |
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367 -- (stanzas which are fine to send before dialback) |
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368 -- Note that this is *not* the stanza queue (which |
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369 -- we can only send if auth succeeds) :) |
|
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370 local send_buffer = session.send_buffer; |
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371 if send_buffer and #send_buffer > 0 then |
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372 log("debug", "Sending s2s send_buffer now..."); |
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373 for i, data in ipairs(send_buffer) do |
|
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374 session.sends2s(tostring(data)); |
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375 send_buffer[i] = nil; |
|
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376 end |
|
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|
377 end |
|
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378 session.send_buffer = nil; |
|
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379 |
| 148 | 380 if not session.dialback_verifying then |
|
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381 initiate_dialback(session); |
| 148 | 382 else |
| 383 mark_connected(session); | |
| 384 end | |
| 385 end | |
| 259 | 386 |
| 148 | 387 session.notopen = nil; |
| 388 end | |
| 389 | |
|
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390 function streamclosed(session) |
|
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391 (session.log or log)("debug", "</stream:stream>"); |
|
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392 if session.sends2s then |
|
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393 session.sends2s("</stream:stream>"); |
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394 end |
|
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395 session.notopen = true; |
|
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396 end |
|
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397 |
|
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398 function initiate_dialback(session) |
|
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399 -- generate dialback key |
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400 session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host); |
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401 session.sends2s(format("<db:result from='%s' to='%s'>%s</db:result>", session.from_host, session.to_host, session.dialback_key)); |
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402 session.log("info", "sent dialback key on outgoing s2s stream"); |
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403 end |
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404 |
| 148 | 405 function generate_dialback(id, to, from) |
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406 return sha256_hash(id..to..from..dialback_secret, true); |
| 148 | 407 end |
| 408 | |
| 409 function verify_dialback(id, to, from, key) | |
| 410 return key == generate_dialback(id, to, from); | |
| 411 end | |
| 412 | |
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413 function make_authenticated(session, host) |
| 148 | 414 if session.type == "s2sout_unauthed" then |
| 415 session.type = "s2sout"; | |
| 416 elseif session.type == "s2sin_unauthed" then | |
| 417 session.type = "s2sin"; | |
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418 if host then |
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419 session.hosts[host].authed = true; |
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420 end |
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421 elseif session.type == "s2sin" and host then |
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422 session.hosts[host].authed = true; |
| 148 | 423 else |
| 424 return false; | |
| 425 end | |
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426 session.log("debug", "connection %s->%s is now authenticated", session.from_host or "(unknown)", session.to_host or "(unknown)"); |
| 148 | 427 |
| 428 mark_connected(session); | |
| 429 | |
| 430 return true; | |
| 431 end | |
| 432 | |
| 433 function mark_connected(session) | |
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434 local sendq, send = session.sendq, session.sends2s; |
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435 |
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436 local from, to = session.from_host, session.to_host; |
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437 |
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438 session.log("info", session.direction.." s2s connection "..from.."->"..to.." complete"); |
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439 |
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440 local send_to_host = send_to_host; |
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441 function session.send(data) send_to_host(to, from, data); end |
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442 |
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443 |
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444 if session.direction == "outgoing" then |
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445 if sendq then |
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446 session.log("debug", "sending "..#sendq.." queued stanzas across new outgoing connection to "..session.to_host); |
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447 for i, data in ipairs(sendq) do |
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448 send(data[1]); |
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449 sendq[i] = nil; |
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450 end |
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451 session.sendq = nil; |
| 148 | 452 end |
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453 |
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454 session.srv_hosts = nil; |
| 148 | 455 end |
| 456 end | |
| 457 | |
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458 function destroy_session(session) |
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459 (session.log or log)("info", "Destroying "..tostring(session.direction).." session "..tostring(session.from_host).."->"..tostring(session.to_host)); |
| 331 | 460 |
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461 if session.direction == "outgoing" then |
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462 hosts[session.from_host].s2sout[session.to_host] = nil; |
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463 bounce_sendq(session); |
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464 elseif session.direction == "incoming" then |
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465 incoming_s2s[session] = nil; |
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466 end |
| 331 | 467 |
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468 for k in pairs(session) do |
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469 if k ~= "trace" then |
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470 session[k] = nil; |
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471 end |
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472 end |
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473 end |
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474 |
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475 return _M; |
