Software / code / prosody
Annotate
core/s2smanager.lua @ 1792:407f282f559e
Merge with 0.5
| author | Matthew Wild <mwild1@gmail.com> |
|---|---|
| date | Sat, 19 Sep 2009 17:42:16 +0100 |
| parent | 1686:232c2bf155c7 |
| parent | 1791:42d0b68a1efd |
| child | 1794:218f720af304 |
| 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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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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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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38 local dialback_secret = uuid_gen(); |
| 148 | 39 |
| 974 | 40 local adns = require "net.adns"; |
| 41 | |
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42 local dns_timeout = config.get("*", "core", "dns_timeout") or 60; |
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43 |
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44 incoming_s2s = {}; |
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45 local incoming_s2s = incoming_s2s; |
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46 |
| 148 | 47 module "s2smanager" |
| 48 | |
| 337 | 49 local function compare_srv_priorities(a,b) return a.priority < b.priority or a.weight < b.weight; end |
| 50 | |
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51 local function bounce_sendq(session) |
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52 local sendq = session.sendq; |
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53 if sendq then |
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54 session.log("info", "sending error replies for "..#sendq.." queued stanzas because of failed outgoing connection to "..tostring(session.to_host)); |
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55 local dummy = { |
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56 type = "s2sin"; |
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57 send = function(s) |
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58 (session.log or log)("error", "Replying to to an s2s error reply, please report this! Traceback: %s", get_traceback()); |
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59 end; |
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60 dummy = true; |
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61 }; |
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62 for i, data in ipairs(sendq) do |
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63 local reply = data[2]; |
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64 local xmlns = reply.attr.xmlns; |
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65 if not xmlns or xmlns == "jabber:client" or xmlns == "jabber:server" then |
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66 reply.attr.type = "error"; |
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67 reply:tag("error", {type = "cancel"}) |
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68 :tag("remote-server-not-found", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up(); |
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69 core_process_stanza(dummy, reply); |
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70 end |
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71 sendq[i] = nil; |
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72 end |
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73 session.sendq = nil; |
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74 end |
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75 end |
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76 |
| 148 | 77 function send_to_host(from_host, to_host, data) |
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78 local host = hosts[from_host].s2sout[to_host]; |
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79 if host then |
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80 -- We have a connection to this host already |
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81 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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82 (host.log or log)("debug", "trying to send over unauthed s2sout to "..to_host); |
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83 if not host.notopen and not host.dialback_key and host.sends2s then |
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84 host.log("debug", "dialback had not been initiated"); |
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85 initiate_dialback(host); |
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86 end |
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87 |
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88 -- Queue stanza until we are able to send it |
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89 if host.sendq then t_insert(host.sendq, {tostring(data), st.reply(data)}); |
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90 else host.sendq = { {tostring(data), st.reply(data)} }; end |
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91 host.log("debug", "stanza [%s] queued ", data.name); |
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92 elseif host.type == "local" or host.type == "component" then |
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93 log("error", "Trying to send a stanza to ourselves??") |
| 256 | 94 log("error", "Traceback: %s", get_traceback()); |
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95 log("error", "Stanza: %s", tostring(data)); |
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96 else |
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97 (host.log or log)("debug", "going to send stanza to "..to_host.." from "..from_host); |
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98 -- FIXME |
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99 if host.from_host ~= from_host then |
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100 log("error", "WARNING! This might, possibly, be a bug, but it might not..."); |
| 331 | 101 log("error", "We are going to send from %s instead of %s", tostring(host.from_host), tostring(from_host)); |
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102 end |
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103 host.sends2s(data); |
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104 host.log("debug", "stanza sent over "..host.type); |
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105 end |
| 148 | 106 else |
| 107 log("debug", "opening a new outgoing connection for this stanza"); | |
| 108 local host_session = new_outgoing(from_host, to_host); | |
| 109 -- Store in buffer | |
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110 host_session.sendq = { {tostring(data), st.reply(data)} }; |
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111 log("debug", "stanza [%s] queued until connection complete", tostring(data.name)); |
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112 if (not host_session.connecting) and (not host_session.conn) then |
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113 log("warn", "Connection to %s failed already, destroying session...", to_host); |
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114 destroy_session(host_session); |
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115 end |
| 148 | 116 end |
| 117 end | |
| 118 | |
| 119 local open_sessions = 0; | |
| 120 | |
| 121 function new_incoming(conn) | |
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122 local session = { conn = conn, type = "s2sin_unauthed", direction = "incoming", hosts = {} }; |
| 148 | 123 if true then |
| 124 session.trace = newproxy(true); | |
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125 getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; end; |
| 148 | 126 end |
| 127 open_sessions = open_sessions + 1; | |
| 343 | 128 local w, log = conn.write, logger_init("s2sin"..tostring(conn):match("[a-f0-9]+$")); |
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129 session.log = log; |
| 343 | 130 session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end |
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131 incoming_s2s[session] = true; |
| 148 | 132 return session; |
| 133 end | |
| 134 | |
| 135 function new_outgoing(from_host, to_host) | |
| 136 local host_session = { to_host = to_host, from_host = from_host, notopen = true, type = "s2sout_unauthed", direction = "outgoing" }; | |
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137 hosts[from_host].s2sout[to_host] = host_session; |
| 148 | 138 |
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139 local log; |
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140 do |
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141 local conn_name = "s2sout"..tostring(host_session):match("[a-f0-9]*$"); |
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142 log = logger_init(conn_name); |
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143 host_session.log = log; |
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144 end |
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145 |
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146 -- This is the first call, can't fail (the first step is DNS lookup) |
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147 attempt_connection(host_session); |
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148 |
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149 if not host_session.sends2s then |
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150 -- A sends2s which buffers data (until the stream is opened) |
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151 -- note that data in this buffer will be sent before the stream is authed |
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152 -- and will not be ack'd in any way, successful or otherwise |
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153 local buffer; |
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154 function host_session.sends2s(data) |
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155 if not buffer then |
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156 buffer = {}; |
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157 host_session.send_buffer = buffer; |
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158 end |
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159 log("debug", "Buffering data on unconnected s2sout to %s", to_host); |
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160 buffer[#buffer+1] = data; |
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161 log("debug", "Buffered item %d: %s", #buffer, tostring(data)); |
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162 end |
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163 |
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164 end |
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165 |
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166 return host_session; |
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167 end |
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168 |
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169 |
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170 function attempt_connection(host_session, err) |
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171 local from_host, to_host = host_session.from_host, host_session.to_host; |
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172 local connect_host, connect_port = idna_to_ascii(to_host), 5269; |
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173 |
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174 if not err then -- This is our first attempt |
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175 log("debug", "First attempt to connect to %s, starting with SRV lookup...", to_host); |
| 974 | 176 host_session.connecting = true; |
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177 local handle; |
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178 handle = adns.lookup(function (answer) |
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179 handle = nil; |
| 974 | 180 host_session.connecting = nil; |
| 181 if answer then | |
| 182 log("debug", to_host.." has SRV records, handling..."); | |
| 183 local srv_hosts = {}; | |
| 184 host_session.srv_hosts = srv_hosts; | |
| 185 for _, record in ipairs(answer) do | |
| 186 t_insert(srv_hosts, record.srv); | |
| 187 end | |
| 188 t_sort(srv_hosts, compare_srv_priorities); | |
| 189 | |
| 190 local srv_choice = srv_hosts[1]; | |
| 191 host_session.srv_choice = 1; | |
| 192 if srv_choice then | |
| 193 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; | |
| 194 log("debug", "Best record found, will connect to %s:%d", connect_host, connect_port); | |
| 195 end | |
| 196 else | |
| 197 log("debug", to_host.." has no SRV records, falling back to A"); | |
| 337 | 198 end |
| 974 | 199 -- Try with SRV, or just the plain hostname if no SRV |
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200 local ok, err = try_connect(host_session, connect_host, connect_port); |
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201 if not ok then |
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202 if not attempt_connection(host_session, err) then |
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203 -- No more attempts will be made |
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204 destroy_session(host_session); |
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205 end |
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206 end |
| 974 | 207 end, "_xmpp-server._tcp."..connect_host..".", "SRV"); |
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208 |
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209 -- Set handler for DNS timeout |
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210 add_task(dns_timeout, function () |
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211 if handle then |
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212 adns.cancel(handle, true); |
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213 end |
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214 end); |
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215 |
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216 log("debug", "DNS lookup for %s sent, waiting for response before we can connect", to_host); |
| 974 | 217 return true; -- Attempt in progress |
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218 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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219 host_session.srv_choice = host_session.srv_choice + 1; |
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220 local srv_choice = host_session.srv_hosts[host_session.srv_choice]; |
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221 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; |
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222 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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223 else |
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224 host_session.log("info", "Out of connection options, can't connect to %s", tostring(host_session.to_host)); |
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225 -- We're out of options |
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226 return false; |
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227 end |
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228 |
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229 if not (connect_host and connect_port) then |
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230 -- Likely we couldn't resolve DNS |
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231 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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232 return false; |
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233 end |
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234 |
| 974 | 235 return try_connect(host_session, connect_host, connect_port); |
| 236 end | |
| 237 | |
| 238 function try_connect(host_session, connect_host, connect_port) | |
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239 host_session.connecting = true; |
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240 local handle; |
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241 handle = adns.lookup(function (reply) |
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242 handle = nil; |
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243 host_session.connecting = nil; |
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244 if reply and reply[1] and reply[1].a then |
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245 log("debug", "DNS reply for %s gives us %s", connect_host, reply[1].a); |
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246 return make_connect(host_session, reply[1].a, connect_port); |
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247 else |
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248 log("debug", "DNS lookup failed to get a response for %s", connect_host); |
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249 if not attempt_connection(host_session, "name resolution failed") then -- Retry if we can |
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250 log("debug", "No other records to try for %s - destroying", host_session.to_host); |
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251 destroy_session(host_session); -- End of the line, we can't |
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252 end |
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253 end |
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254 end, connect_host, "A", "IN"); |
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255 |
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256 -- Set handler for DNS timeout |
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257 add_task(dns_timeout, function () |
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258 if handle then |
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259 adns.cancel(handle, true); |
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260 end |
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261 end); |
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262 |
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263 return true; |
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264 end |
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265 |
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266 function make_connect(host_session, connect_host, connect_port) |
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267 host_session.log("info", "Beginning new connection attempt to %s (%s:%d)", host_session.to_host, connect_host, connect_port); |
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268 -- Ok, we're going to try to connect |
| 974 | 269 |
| 270 local from_host, to_host = host_session.from_host, host_session.to_host; | |
| 271 | |
| 272 local conn, handler = socket.tcp() | |
| 273 | |
|
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274 conn:settimeout(0); |
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275 local success, err = conn:connect(connect_host, connect_port); |
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276 if not success and err ~= "timeout" then |
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277 log("warn", "s2s connect() to %s (%s:%d) failed: %s", host_session.to_host, connect_host, connect_port, err); |
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278 return false, err; |
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279 end |
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280 |
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281 local cl = connlisteners_get("xmppserver"); |
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282 conn = wrapclient(conn, connect_host, connect_port, cl, cl.default_mode or 1, hosts[from_host].ssl_ctx, false ); |
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283 host_session.conn = conn; |
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284 |
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285 -- Register this outgoing connection so that xmppserver_listener knows about it |
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286 -- otherwise it will assume it is a new incoming connection |
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287 cl.register_outgoing(conn, host_session); |
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288 |
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289 local w = conn.write; |
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290 host_session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end |
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291 |
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292 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 | 293 log("debug", "Connection attempt in progress..."); |
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294 return true; |
| 148 | 295 end |
| 296 | |
| 297 function streamopened(session, attr) | |
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298 local send = session.sends2s; |
| 148 | 299 |
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300 -- TODO: #29: SASL/TLS on s2s streams |
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301 session.version = 0; --tonumber(attr.version) or 0; |
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302 |
| 148 | 303 if session.version >= 1.0 and not (attr.to and attr.from) then |
| 304 log("warn", (session.to_host or "(unknown)").." failed to specify 'to' or 'from' hostname as per RFC"); | |
| 305 end | |
| 306 | |
| 307 if session.direction == "incoming" then | |
| 308 -- Send a reply stream header | |
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309 session.to_host = attr.to and nameprep(attr.to); |
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310 session.from_host = attr.from and nameprep(attr.from); |
| 148 | 311 |
| 312 session.streamid = uuid_gen(); | |
|
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313 (session.log or log)("debug", "incoming s2s received <stream:stream>"); |
| 148 | 314 send("<?xml version='1.0'?>"); |
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315 send(stanza("stream:stream", { xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback', |
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316 ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.to_host }):top_tag()); |
| 331 | 317 if session.to_host and not hosts[session.to_host] then |
| 318 -- Attempting to connect to a host we don't serve | |
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319 session:close({ condition = "host-unknown"; text = "This host does not serve "..session.to_host }); |
| 331 | 320 return; |
| 321 end | |
|
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322 if session.version >= 1.0 then |
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323 send(st.stanza("stream:features") |
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324 :tag("dialback", { xmlns='urn:xmpp:features:dialback' }):tag("optional"):up():up()); |
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325 end |
| 148 | 326 elseif session.direction == "outgoing" then |
| 327 -- If we are just using the connection for verifying dialback keys, we won't try and auth it | |
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328 if not attr.id then error("stream response did not give us a streamid!!!"); end |
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329 session.streamid = attr.id; |
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330 |
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331 -- Send unauthed buffer |
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332 -- (stanzas which are fine to send before dialback) |
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333 -- Note that this is *not* the stanza queue (which |
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334 -- we can only send if auth succeeds) :) |
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335 local send_buffer = session.send_buffer; |
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336 if send_buffer and #send_buffer > 0 then |
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337 log("debug", "Sending s2s send_buffer now..."); |
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338 for i, data in ipairs(send_buffer) do |
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339 session.sends2s(tostring(data)); |
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340 send_buffer[i] = nil; |
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341 end |
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342 end |
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343 session.send_buffer = nil; |
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344 |
| 148 | 345 if not session.dialback_verifying then |
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346 initiate_dialback(session); |
| 148 | 347 else |
| 348 mark_connected(session); | |
| 349 end | |
| 350 end | |
| 259 | 351 |
| 148 | 352 session.notopen = nil; |
| 353 end | |
| 354 | |
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355 function streamclosed(session) |
|
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356 (session.log or log)("debug", "</stream:stream>"); |
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357 if session.sends2s then |
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358 session.sends2s("</stream:stream>"); |
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359 end |
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360 session.notopen = true; |
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361 end |
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362 |
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363 function initiate_dialback(session) |
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364 -- generate dialback key |
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365 session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host); |
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366 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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367 session.log("info", "sent dialback key on outgoing s2s stream"); |
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368 end |
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369 |
| 148 | 370 function generate_dialback(id, to, from) |
|
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371 return sha256_hash(id..to..from..dialback_secret, true); |
| 148 | 372 end |
| 373 | |
| 374 function verify_dialback(id, to, from, key) | |
| 375 return key == generate_dialback(id, to, from); | |
| 376 end | |
| 377 | |
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378 function make_authenticated(session, host) |
| 148 | 379 if session.type == "s2sout_unauthed" then |
| 380 session.type = "s2sout"; | |
| 381 elseif session.type == "s2sin_unauthed" then | |
| 382 session.type = "s2sin"; | |
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383 if host then |
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384 session.hosts[host].authed = true; |
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385 end |
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386 elseif session.type == "s2sin" and host then |
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387 session.hosts[host].authed = true; |
| 148 | 388 else |
| 389 return false; | |
| 390 end | |
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391 session.log("debug", "connection %s->%s is now authenticated", session.from_host or "(unknown)", session.to_host or "(unknown)"); |
| 148 | 392 |
| 393 mark_connected(session); | |
| 394 | |
| 395 return true; | |
| 396 end | |
| 397 | |
| 398 function mark_connected(session) | |
|
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399 local sendq, send = session.sendq, session.sends2s; |
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400 |
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401 local from, to = session.from_host, session.to_host; |
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402 |
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403 session.log("info", session.direction.." s2s connection "..from.."->"..to.." complete"); |
|
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404 |
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405 local send_to_host = send_to_host; |
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406 function session.send(data) send_to_host(to, from, data); end |
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407 |
|
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408 |
|
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409 if session.direction == "outgoing" then |
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410 if sendq then |
|
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411 session.log("debug", "sending "..#sendq.." queued stanzas across new outgoing connection to "..session.to_host); |
|
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412 for i, data in ipairs(sendq) do |
|
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413 send(data[1]); |
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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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414 sendq[i] = nil; |
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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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415 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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416 session.sendq = nil; |
| 148 | 417 end |
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1345
35b5686d73ea
s2smanager: Remove srv_hosts from session when connected, this fixes attempting to reconnect s2s sessions when they are closed during shutdown
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418 |
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35b5686d73ea
s2smanager: Remove srv_hosts from session when connected, this fixes attempting to reconnect s2s sessions when they are closed during shutdown
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419 session.srv_hosts = nil; |
| 148 | 420 end |
| 421 end | |
| 422 | |
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423 function destroy_session(session) |
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169
92768120b717
Little tweak for more useful logging of closed s2s sessions
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424 (session.log or log)("info", "Destroying "..tostring(session.direction).." session "..tostring(session.from_host).."->"..tostring(session.to_host)); |
| 331 | 425 |
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426 if session.direction == "outgoing" then |
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182f0c895676
Now outgoing s2s sessions are associated with their from_host, fixes #15
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427 hosts[session.from_host].s2sout[session.to_host] = nil; |
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6957fe7b0313
Bounce stanza errors on failed s2s
Waqas Hussain <waqas20@gmail.com>
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428 bounce_sendq(session); |
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621
cd2cab5400fc
Add support for dialback piggy-backing. Fixes #37. Thanks to CShadowRun for helping me test :)
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429 elseif session.direction == "incoming" then |
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cd2cab5400fc
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430 incoming_s2s[session] = nil; |
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431 end |
| 331 | 432 |
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433 for k in pairs(session) do |
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434 if k ~= "trace" then |
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435 session[k] = nil; |
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436 end |
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437 end |
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438 end |
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439 |
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bbbd169b326b
Just committing this warning, because I want to know if the problem really affects us
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440 return _M; |
