Software / code / prosody
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core/s2smanager.lua @ 1890:aed0d8a0cca8
s2smanager: Don't wait for stream:features from non-XMPP-1.0 hosts
| author | Matthew Wild <mwild1@gmail.com> |
|---|---|
| date | Sun, 04 Oct 2009 16:39:57 +0100 |
| parent | 1889:e875833ae08e |
| child | 1891:fd725a28141d |
| 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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Port to new server.lua, quite some changes, but I believe everything to be working
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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 |
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s2smanager: Send stream:features for incoming s2s connections which support XMPP 1.0
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30 local fire_event = require "core.eventmanager".fire_event; |
| 148 | 31 local uuid_gen = require "util.uuid".generate; |
| 32 | |
| 33 local logger_init = require "util.logger".init; | |
| 34 | |
| 35 local log = logger_init("s2smanager"); | |
| 36 | |
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37 local sha256_hash = require "util.hashes".sha256; |
| 148 | 38 |
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s2smanager: Use a UUID as the dialback secret
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39 local dialback_secret = uuid_gen(); |
| 148 | 40 |
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s2smanager: Compatibility with domains which use CNAMEs
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41 local adns, dns = require "net.adns", require "net.dns"; |
| 974 | 42 |
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43 local connect_timeout = config.get("*", "core", "s2s_timeout") or 60; |
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44 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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45 local max_dns_depth = config.get("*", "core", "dns_max_depth") or 3; |
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46 |
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47 incoming_s2s = {}; |
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48 local incoming_s2s = incoming_s2s; |
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49 |
| 148 | 50 module "s2smanager" |
| 51 | |
| 337 | 52 local function compare_srv_priorities(a,b) return a.priority < b.priority or a.weight < b.weight; end |
| 53 | |
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54 local function bounce_sendq(session) |
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55 local sendq = session.sendq; |
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56 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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57 session.log("info", "sending error replies for "..#sendq.." queued stanzas because of failed outgoing connection to "..tostring(session.to_host)); |
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58 local dummy = { |
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59 type = "s2sin"; |
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60 send = function(s) |
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61 (session.log or log)("error", "Replying to to an s2s error reply, please report this! Traceback: %s", get_traceback()); |
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62 end; |
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63 dummy = true; |
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64 }; |
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65 for i, data in ipairs(sendq) do |
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66 local reply = data[2]; |
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67 local xmlns = reply.attr.xmlns; |
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68 if not xmlns or xmlns == "jabber:client" or xmlns == "jabber:server" then |
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69 reply.attr.type = "error"; |
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70 reply:tag("error", {type = "cancel"}) |
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71 :tag("remote-server-not-found", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up(); |
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72 core_process_stanza(dummy, reply); |
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73 end |
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74 sendq[i] = nil; |
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75 end |
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76 session.sendq = nil; |
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77 end |
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78 end |
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79 |
| 148 | 80 function send_to_host(from_host, to_host, data) |
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81 local host = hosts[from_host].s2sout[to_host]; |
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82 if host then |
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83 -- We have a connection to this host already |
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84 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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85 (host.log or log)("debug", "trying to send over unauthed s2sout to "..to_host); |
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86 if not host.notopen and not host.dialback_key and host.sends2s then |
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87 host.log("debug", "dialback had not been initiated"); |
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88 initiate_dialback(host); |
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89 end |
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90 |
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91 -- Queue stanza until we are able to send it |
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92 if host.sendq then t_insert(host.sendq, {tostring(data), st.reply(data)}); |
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93 else host.sendq = { {tostring(data), st.reply(data)} }; end |
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94 host.log("debug", "stanza [%s] queued ", data.name); |
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95 elseif host.type == "local" or host.type == "component" then |
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96 log("error", "Trying to send a stanza to ourselves??") |
| 256 | 97 log("error", "Traceback: %s", get_traceback()); |
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98 log("error", "Stanza: %s", tostring(data)); |
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99 else |
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100 (host.log or log)("debug", "going to send stanza to "..to_host.." from "..from_host); |
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101 -- FIXME |
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102 if host.from_host ~= from_host then |
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103 log("error", "WARNING! This might, possibly, be a bug, but it might not..."); |
| 331 | 104 log("error", "We are going to send from %s instead of %s", tostring(host.from_host), tostring(from_host)); |
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105 end |
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106 host.sends2s(data); |
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107 host.log("debug", "stanza sent over "..host.type); |
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108 end |
| 148 | 109 else |
| 110 log("debug", "opening a new outgoing connection for this stanza"); | |
| 111 local host_session = new_outgoing(from_host, to_host); | |
| 112 -- Store in buffer | |
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113 host_session.sendq = { {tostring(data), st.reply(data)} }; |
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114 log("debug", "stanza [%s] queued until connection complete", tostring(data.name)); |
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115 if (not host_session.connecting) and (not host_session.conn) then |
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116 log("warn", "Connection to %s failed already, destroying session...", to_host); |
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117 destroy_session(host_session); |
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118 end |
| 148 | 119 end |
| 120 end | |
| 121 | |
| 122 local open_sessions = 0; | |
| 123 | |
| 124 function new_incoming(conn) | |
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125 local session = { conn = conn, type = "s2sin_unauthed", direction = "incoming", hosts = {} }; |
| 148 | 126 if true then |
| 127 session.trace = newproxy(true); | |
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128 getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; end; |
| 148 | 129 end |
| 130 open_sessions = open_sessions + 1; | |
| 343 | 131 local w, log = conn.write, logger_init("s2sin"..tostring(conn):match("[a-f0-9]+$")); |
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132 session.log = log; |
| 343 | 133 session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end |
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134 incoming_s2s[session] = true; |
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135 add_task(connect_timeout, function () |
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136 if session.conn ~= conn or |
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137 session.type == "s2sin" then |
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138 return; -- Ok, we're connect[ed|ing] |
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139 end |
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140 -- Not connected, need to close session and clean up |
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141 (session.log or log)("warn", "Destroying incomplete session %s->%s due to inactivity", |
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142 session.from_host or "(unknown)", session.to_host or "(unknown)"); |
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143 session:close("connection-timeout"); |
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144 end); |
| 148 | 145 return session; |
| 146 end | |
| 147 | |
| 148 function new_outgoing(from_host, to_host) | |
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149 local host_session = { to_host = to_host, from_host = from_host, host = from_host, |
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150 notopen = true, type = "s2sout_unauthed", direction = "outgoing" }; |
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151 |
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152 hosts[from_host].s2sout[to_host] = host_session; |
| 148 | 153 |
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154 local log; |
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155 do |
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156 local conn_name = "s2sout"..tostring(host_session):match("[a-f0-9]*$"); |
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157 log = logger_init(conn_name); |
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158 host_session.log = log; |
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159 end |
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160 |
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161 -- This is the first call, can't fail (the first step is DNS lookup) |
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162 attempt_connection(host_session); |
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163 |
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164 if not host_session.sends2s then |
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165 -- A sends2s which buffers data (until the stream is opened) |
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166 -- note that data in this buffer will be sent before the stream is authed |
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167 -- and will not be ack'd in any way, successful or otherwise |
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168 local buffer; |
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169 function host_session.sends2s(data) |
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170 if not buffer then |
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171 buffer = {}; |
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172 host_session.send_buffer = buffer; |
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173 end |
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174 log("debug", "Buffering data on unconnected s2sout to %s", to_host); |
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175 buffer[#buffer+1] = data; |
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176 log("debug", "Buffered item %d: %s", #buffer, tostring(data)); |
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177 end |
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178 |
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179 end |
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180 |
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181 return host_session; |
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182 end |
|
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183 |
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184 |
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185 function attempt_connection(host_session, err) |
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186 local from_host, to_host = host_session.from_host, host_session.to_host; |
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187 local connect_host, connect_port = idna_to_ascii(to_host), 5269; |
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188 |
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189 if not err then -- This is our first attempt |
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190 log("debug", "First attempt to connect to %s, starting with SRV lookup...", to_host); |
| 974 | 191 host_session.connecting = true; |
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192 local handle; |
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193 handle = adns.lookup(function (answer) |
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194 handle = nil; |
| 974 | 195 host_session.connecting = nil; |
| 196 if answer then | |
| 197 log("debug", to_host.." has SRV records, handling..."); | |
| 198 local srv_hosts = {}; | |
| 199 host_session.srv_hosts = srv_hosts; | |
| 200 for _, record in ipairs(answer) do | |
| 201 t_insert(srv_hosts, record.srv); | |
| 202 end | |
| 203 t_sort(srv_hosts, compare_srv_priorities); | |
| 204 | |
| 205 local srv_choice = srv_hosts[1]; | |
| 206 host_session.srv_choice = 1; | |
| 207 if srv_choice then | |
| 208 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; | |
| 209 log("debug", "Best record found, will connect to %s:%d", connect_host, connect_port); | |
| 210 end | |
| 211 else | |
| 212 log("debug", to_host.." has no SRV records, falling back to A"); | |
| 337 | 213 end |
| 974 | 214 -- Try with SRV, or just the plain hostname if no SRV |
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215 local ok, err = try_connect(host_session, connect_host, connect_port); |
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216 if not ok then |
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217 if not attempt_connection(host_session, err) then |
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218 -- No more attempts will be made |
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219 destroy_session(host_session); |
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220 end |
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221 end |
| 974 | 222 end, "_xmpp-server._tcp."..connect_host..".", "SRV"); |
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223 |
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224 -- Set handler for DNS timeout |
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225 add_task(dns_timeout, function () |
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226 if handle then |
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227 adns.cancel(handle, true); |
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228 end |
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229 end); |
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230 |
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231 log("debug", "DNS lookup for %s sent, waiting for response before we can connect", to_host); |
| 974 | 232 return true; -- Attempt in progress |
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233 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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234 host_session.srv_choice = host_session.srv_choice + 1; |
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235 local srv_choice = host_session.srv_hosts[host_session.srv_choice]; |
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236 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; |
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237 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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238 else |
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239 host_session.log("info", "Out of connection options, can't connect to %s", tostring(host_session.to_host)); |
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240 -- We're out of options |
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241 return false; |
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242 end |
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243 |
|
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244 if not (connect_host and connect_port) then |
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245 -- Likely we couldn't resolve DNS |
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246 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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247 return false; |
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248 end |
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249 |
| 974 | 250 return try_connect(host_session, connect_host, connect_port); |
| 251 end | |
| 252 | |
| 253 function try_connect(host_session, connect_host, connect_port) | |
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254 host_session.connecting = true; |
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255 local handle; |
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256 handle = adns.lookup(function (reply) |
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257 handle = nil; |
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258 host_session.connecting = nil; |
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259 |
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260 -- COMPAT: This is a compromise for all you CNAME-(ab)users :) |
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261 if not (reply and reply[#reply] and reply[#reply].a) then |
|
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262 local count = max_dns_depth; |
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263 reply = dns.peek(connect_host, "CNAME", "IN"); |
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264 while count > 0 and reply and reply[#reply] and not reply[#reply].a and reply[#reply].cname do |
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265 log("debug", "Looking up %s (DNS depth is %d)", tostring(reply[#reply].cname), count); |
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266 reply = dns.peek(reply[#reply].cname, "A", "IN") or dns.peek(reply[#reply].cname, "CNAME", "IN"); |
|
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267 count = count - 1; |
|
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268 end |
|
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269 end |
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270 -- end of CNAME resolving |
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271 |
|
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272 if reply and reply[#reply] and reply[#reply].a then |
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273 log("debug", "DNS reply for %s gives us %s", connect_host, reply[#reply].a); |
|
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274 return make_connect(host_session, reply[#reply].a, connect_port); |
|
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275 else |
|
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276 log("debug", "DNS lookup failed to get a response for %s", connect_host); |
|
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277 if not attempt_connection(host_session, "name resolution failed") then -- Retry if we can |
|
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278 log("debug", "No other records to try for %s - destroying", host_session.to_host); |
|
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279 destroy_session(host_session); -- End of the line, we can't |
|
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280 end |
|
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281 end |
|
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282 end, connect_host, "A", "IN"); |
|
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283 |
|
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284 -- Set handler for DNS timeout |
|
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285 add_task(dns_timeout, function () |
|
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286 if handle then |
|
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287 adns.cancel(handle, true); |
|
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288 end |
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289 end); |
|
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290 |
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291 return true; |
|
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292 end |
|
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293 |
|
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294 function make_connect(host_session, connect_host, connect_port) |
|
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295 host_session.log("info", "Beginning new connection attempt to %s (%s:%d)", host_session.to_host, connect_host, connect_port); |
|
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296 -- Ok, we're going to try to connect |
| 974 | 297 |
| 298 local from_host, to_host = host_session.from_host, host_session.to_host; | |
| 299 | |
| 300 local conn, handler = socket.tcp() | |
| 301 | |
|
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302 conn:settimeout(0); |
|
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303 local success, err = conn:connect(connect_host, connect_port); |
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304 if not success and err ~= "timeout" then |
|
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305 log("warn", "s2s connect() to %s (%s:%d) failed: %s", host_session.to_host, connect_host, connect_port, err); |
|
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306 return false, err; |
|
434
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307 end |
|
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308 |
|
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|
309 local cl = connlisteners_get("xmppserver"); |
|
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310 conn = wrapclient(conn, connect_host, connect_port, cl, cl.default_mode or 1, hosts[from_host].ssl_ctx, false ); |
|
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311 host_session.conn = conn; |
|
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312 |
|
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313 -- Register this outgoing connection so that xmppserver_listener knows about it |
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314 -- otherwise it will assume it is a new incoming connection |
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315 cl.register_outgoing(conn, host_session); |
|
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316 |
|
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317 local w = conn.write; |
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318 host_session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end |
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319 |
|
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320 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 | 321 log("debug", "Connection attempt in progress..."); |
|
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322 add_task(connect_timeout, function () |
|
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323 if host_session.conn ~= conn or |
|
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324 host_session.type == "s2sout" or |
|
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|
325 host_session.connecting then |
|
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326 return; -- Ok, we're connect[ed|ing] |
|
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|
327 end |
|
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|
328 -- Not connected, need to close session and clean up |
|
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|
329 (host_session.log or log)("warn", "Destroying incomplete session %s->%s due to inactivity", |
|
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|
330 host_session.from_host or "(unknown)", host_session.to_host or "(unknown)"); |
|
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|
331 host_session:close("connection-timeout"); |
|
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|
332 end); |
|
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|
333 return true; |
| 148 | 334 end |
| 335 | |
| 336 function streamopened(session, attr) | |
|
186
bfa8a30ea488
sends2s -> s2s_session.send(), s2s_session.send() -> s2s_session.sends2s()
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diff
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|
337 local send = session.sends2s; |
| 148 | 338 |
|
544
efde848869c5
Don't send stream:features to incoming s2s connections
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diff
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|
339 -- TODO: #29: SASL/TLS on s2s streams |
|
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diff
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|
340 session.version = 0; --tonumber(attr.version) or 0; |
|
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|
341 |
| 148 | 342 if session.version >= 1.0 and not (attr.to and attr.from) then |
| 343 log("warn", (session.to_host or "(unknown)").." failed to specify 'to' or 'from' hostname as per RFC"); | |
| 344 end | |
| 345 | |
| 346 if session.direction == "incoming" then | |
| 347 -- Send a reply stream header | |
|
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Fixed: Some nil access bugs
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diff
changeset
|
348 session.to_host = attr.to and nameprep(attr.to); |
|
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|
349 session.from_host = attr.from and nameprep(attr.from); |
| 148 | 350 |
| 351 session.streamid = uuid_gen(); | |
|
360
e918c979ad1a
Remove or comment useless prints, or change them to log()
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diff
changeset
|
352 (session.log or log)("debug", "incoming s2s received <stream:stream>"); |
| 148 | 353 send("<?xml version='1.0'?>"); |
|
852
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diff
changeset
|
354 send(stanza("stream:stream", { xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback', |
|
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|
355 ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.to_host }):top_tag()); |
| 331 | 356 if session.to_host and not hosts[session.to_host] then |
| 357 -- Attempting to connect to a host we don't serve | |
|
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diff
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|
358 session:close({ condition = "host-unknown"; text = "This host does not serve "..session.to_host }); |
| 331 | 359 return; |
| 360 end | |
|
345
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diff
changeset
|
361 if session.version >= 1.0 then |
|
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|
362 local features = st.stanza("stream:features"); |
|
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|
363 fire_event("s2s-stream-features", session, features); |
|
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|
364 |
|
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|
365 log("debug", "Sending stream features: %s", tostring(features)); |
|
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|
366 send(features); |
|
345
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diff
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|
367 end |
| 148 | 368 elseif session.direction == "outgoing" then |
| 369 -- If we are just using the connection for verifying dialback keys, we won't try and auth it | |
|
190
1e993b7deae7
General fixes for s2s, to make it more robust (I hope), sending data to remote hosts sane (s2ssession.send() works as expected), recycle outgoing dialback connections, etc.
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diff
changeset
|
370 if not attr.id then error("stream response did not give us a streamid!!!"); end |
|
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General fixes for s2s, to make it more robust (I hope), sending data to remote hosts sane (s2ssession.send() works as expected), recycle outgoing dialback connections, etc.
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diff
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|
371 session.streamid = attr.id; |
|
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diff
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|
372 |
|
1007
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|
373 -- Send unauthed buffer |
|
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diff
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|
374 -- (stanzas which are fine to send before dialback) |
|
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|
375 -- Note that this is *not* the stanza queue (which |
|
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changeset
|
376 -- we can only send if auth succeeds) :) |
|
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diff
changeset
|
377 local send_buffer = session.send_buffer; |
|
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|
378 if send_buffer and #send_buffer > 0 then |
|
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diff
changeset
|
379 log("debug", "Sending s2s send_buffer now..."); |
|
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diff
changeset
|
380 for i, data in ipairs(send_buffer) do |
|
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diff
changeset
|
381 session.sends2s(tostring(data)); |
|
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diff
changeset
|
382 send_buffer[i] = nil; |
|
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|
383 end |
|
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|
384 end |
|
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changeset
|
385 session.send_buffer = nil; |
|
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diff
changeset
|
386 |
|
1890
aed0d8a0cca8
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diff
changeset
|
387 -- If server is pre-1.0, don't wait for features, just do dialback |
|
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diff
changeset
|
388 if session.version < 1.0 then |
|
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diff
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|
389 if not session.dialback_verifying then |
|
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diff
changeset
|
390 initiate_dialback(session); |
|
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diff
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|
391 else |
|
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392 mark_connected(session); |
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393 end |
| 148 | 394 end |
| 395 end | |
| 259 | 396 |
| 148 | 397 session.notopen = nil; |
| 398 end | |
| 399 | |
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400 function streamclosed(session) |
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401 (session.log or log)("debug", "</stream:stream>"); |
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402 if session.sends2s then |
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403 session.sends2s("</stream:stream>"); |
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404 end |
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405 session.notopen = true; |
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406 end |
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407 |
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408 function initiate_dialback(session) |
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409 -- generate dialback key |
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410 session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host); |
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411 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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412 session.log("info", "sent dialback key on outgoing s2s stream"); |
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413 end |
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414 |
| 148 | 415 function generate_dialback(id, to, from) |
|
448
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416 return sha256_hash(id..to..from..dialback_secret, true); |
| 148 | 417 end |
| 418 | |
| 419 function verify_dialback(id, to, from, key) | |
| 420 return key == generate_dialback(id, to, from); | |
| 421 end | |
| 422 | |
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423 function make_authenticated(session, host) |
| 148 | 424 if session.type == "s2sout_unauthed" then |
| 425 session.type = "s2sout"; | |
| 426 elseif session.type == "s2sin_unauthed" then | |
| 427 session.type = "s2sin"; | |
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428 if host then |
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429 session.hosts[host].authed = true; |
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430 end |
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431 elseif session.type == "s2sin" and host then |
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432 session.hosts[host].authed = true; |
| 148 | 433 else |
| 434 return false; | |
| 435 end | |
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436 session.log("debug", "connection %s->%s is now authenticated", session.from_host or "(unknown)", session.to_host or "(unknown)"); |
| 148 | 437 |
| 438 mark_connected(session); | |
| 439 | |
| 440 return true; | |
| 441 end | |
| 442 | |
| 443 function mark_connected(session) | |
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444 local sendq, send = session.sendq, session.sends2s; |
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445 |
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446 local from, to = session.from_host, session.to_host; |
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447 |
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448 session.log("info", session.direction.." s2s connection "..from.."->"..to.." complete"); |
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449 |
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450 local send_to_host = send_to_host; |
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451 function session.send(data) send_to_host(to, from, data); end |
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452 |
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453 |
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454 if session.direction == "outgoing" then |
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455 if sendq then |
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456 session.log("debug", "sending "..#sendq.." queued stanzas across new outgoing connection to "..session.to_host); |
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457 for i, data in ipairs(sendq) do |
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458 send(data[1]); |
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459 sendq[i] = nil; |
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460 end |
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461 session.sendq = nil; |
| 148 | 462 end |
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463 |
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464 session.srv_hosts = nil; |
| 148 | 465 end |
| 466 end | |
| 467 | |
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468 function destroy_session(session) |
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469 (session.log or log)("info", "Destroying "..tostring(session.direction).." session "..tostring(session.from_host).."->"..tostring(session.to_host)); |
| 331 | 470 |
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471 if session.direction == "outgoing" then |
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472 hosts[session.from_host].s2sout[session.to_host] = nil; |
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473 bounce_sendq(session); |
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474 elseif session.direction == "incoming" then |
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475 incoming_s2s[session] = nil; |
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476 end |
| 331 | 477 |
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478 for k in pairs(session) do |
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479 if k ~= "trace" then |
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480 session[k] = nil; |
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481 end |
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482 end |
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483 end |
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484 |
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485 return _M; |
