Sun, 12 Jul 2009 15:21:10 +0100
mod_bosh: Use new httpserver helper to initialise ports
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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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s2smanager: Timeout DNS requests after 60 seconds (or dns_timeout in config)
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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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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 | |
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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core.s2smanager: Don't initiate dialback if we don't have a connection yet
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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]+$")); |
129 | session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end | |
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130 | incoming_s2s[session] = true; |
148 | 131 | return session; |
132 | end | |
133 | ||
134 | function new_outgoing(from_host, to_host) | |
135 | local host_session = { to_host = to_host, from_host = from_host, notopen = true, type = "s2sout_unauthed", direction = "outgoing" }; | |
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136 | hosts[from_host].s2sout[to_host] = host_session; |
148 | 137 | |
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138 | local log; |
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139 | do |
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140 | local conn_name = "s2sout"..tostring(host_session):match("[a-f0-9]*$"); |
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141 | log = logger_init(conn_name); |
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142 | host_session.log = log; |
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143 | end |
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144 | |
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145 | -- This is the first call, can't fail (the first step is DNS lookup) |
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146 | attempt_connection(host_session); |
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147 | |
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148 | if not host_session.sends2s then |
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149 | -- A sends2s which buffers data (until the stream is opened) |
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150 | -- note that data in this buffer will be sent before the stream is authed |
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151 | -- and will not be ack'd in any way, successful or otherwise |
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152 | local buffer; |
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153 | function host_session.sends2s(data) |
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154 | if not buffer then |
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155 | buffer = {}; |
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156 | host_session.send_buffer = buffer; |
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157 | end |
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158 | log("debug", "Buffering data on unconnected s2sout to %s", to_host); |
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159 | buffer[#buffer+1] = data; |
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160 | log("debug", "Buffered item %d: %s", #buffer, tostring(data)); |
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161 | end |
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162 | |
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163 | end |
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164 | |
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165 | return host_session; |
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166 | end |
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167 | |
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168 | |
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169 | function attempt_connection(host_session, err) |
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170 | local from_host, to_host = host_session.from_host, host_session.to_host; |
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171 | local connect_host, connect_port = idna_to_ascii(to_host), 5269; |
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172 | |
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173 | if not err then -- This is our first attempt |
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174 | log("debug", "First attempt to connect to %s, starting with SRV lookup...", to_host); |
974 | 175 | host_session.connecting = true; |
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176 | local answer, handle; |
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177 | handle = adns.lookup(function (answer) |
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178 | handle = nil; |
974 | 179 | host_session.connecting = nil; |
180 | if answer then | |
181 | log("debug", to_host.." has SRV records, handling..."); | |
182 | local srv_hosts = {}; | |
183 | host_session.srv_hosts = srv_hosts; | |
184 | for _, record in ipairs(answer) do | |
185 | t_insert(srv_hosts, record.srv); | |
186 | end | |
187 | t_sort(srv_hosts, compare_srv_priorities); | |
188 | ||
189 | local srv_choice = srv_hosts[1]; | |
190 | host_session.srv_choice = 1; | |
191 | if srv_choice then | |
192 | connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; | |
193 | log("debug", "Best record found, will connect to %s:%d", connect_host, connect_port); | |
194 | end | |
195 | else | |
196 | log("debug", to_host.." has no SRV records, falling back to A"); | |
337 | 197 | end |
974 | 198 | -- Try with SRV, or just the plain hostname if no SRV |
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199 | local ok, err = try_connect(host_session, connect_host, connect_port); |
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200 | if not ok then |
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201 | if not attempt_connection(host_session, err) then |
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202 | -- No more attempts will be made |
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203 | destroy_session(host_session); |
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204 | end |
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205 | end |
974 | 206 | end, "_xmpp-server._tcp."..connect_host..".", "SRV"); |
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207 | |
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208 | -- Set handler for DNS timeout |
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209 | add_task(dns_timeout, function () |
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210 | if handle then |
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211 | adns.cancel(handle, true); |
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212 | end |
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213 | end); |
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214 | |
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215 | log("debug", "DNS lookup for %s sent, waiting for response before we can connect", to_host); |
974 | 216 | return true; -- Attempt in progress |
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217 | 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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218 | host_session.srv_choice = host_session.srv_choice + 1; |
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219 | local srv_choice = host_session.srv_hosts[host_session.srv_choice]; |
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220 | connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; |
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221 | 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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222 | else |
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223 | host_session.log("info", "Out of connection options, can't connect to %s", tostring(host_session.to_host)); |
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224 | -- We're out of options |
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225 | return false; |
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226 | end |
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227 | |
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228 | if not (connect_host and connect_port) then |
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229 | -- Likely we couldn't resolve DNS |
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230 | 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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231 | return false; |
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232 | end |
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233 | |
974 | 234 | return try_connect(host_session, connect_host, connect_port); |
235 | end | |
236 | ||
237 | function try_connect(host_session, connect_host, connect_port) | |
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238 | host_session.log("info", "Beginning new connection attempt to %s (%s:%d)", host_session.to_host, connect_host, connect_port); |
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239 | -- Ok, we're going to try to connect |
974 | 240 | |
241 | local from_host, to_host = host_session.from_host, host_session.to_host; | |
242 | ||
243 | local conn, handler = socket.tcp() | |
244 | ||
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245 | conn:settimeout(0); |
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246 | local success, err = conn:connect(connect_host, connect_port); |
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247 | if not success and err ~= "timeout" then |
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248 | log("warn", "s2s connect() to %s (%s:%d) failed: %s", host_session.to_host, connect_host, connect_port, err); |
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249 | return false, err; |
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250 | end |
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251 | |
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252 | local cl = connlisteners_get("xmppserver"); |
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253 | conn = wrapclient(conn, connect_host, connect_port, cl, cl.default_mode or 1, hosts[from_host].ssl_ctx, false ); |
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254 | host_session.conn = conn; |
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255 | |
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256 | -- Register this outgoing connection so that xmppserver_listener knows about it |
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257 | -- otherwise it will assume it is a new incoming connection |
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258 | cl.register_outgoing(conn, host_session); |
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259 | |
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260 | local w = conn.write; |
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261 | host_session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end |
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262 | |
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263 | 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 | 264 | log("debug", "Connection attempt in progress..."); |
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265 | return true; |
148 | 266 | end |
267 | ||
268 | function streamopened(session, attr) | |
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269 | local send = session.sends2s; |
148 | 270 | |
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271 | -- TODO: #29: SASL/TLS on s2s streams |
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272 | session.version = 0; --tonumber(attr.version) or 0; |
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273 | |
148 | 274 | if session.version >= 1.0 and not (attr.to and attr.from) then |
275 | log("warn", (session.to_host or "(unknown)").." failed to specify 'to' or 'from' hostname as per RFC"); | |
276 | end | |
277 | ||
278 | if session.direction == "incoming" then | |
279 | -- Send a reply stream header | |
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280 | session.to_host = attr.to and nameprep(attr.to); |
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281 | session.from_host = attr.from and nameprep(attr.from); |
148 | 282 | |
283 | session.streamid = uuid_gen(); | |
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284 | (session.log or log)("debug", "incoming s2s received <stream:stream>"); |
148 | 285 | send("<?xml version='1.0'?>"); |
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286 | send(stanza("stream:stream", { xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback', |
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287 | ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.to_host }):top_tag()); |
331 | 288 | if session.to_host and not hosts[session.to_host] then |
289 | -- Attempting to connect to a host we don't serve | |
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290 | session:close({ condition = "host-unknown"; text = "This host does not serve "..session.to_host }); |
331 | 291 | return; |
292 | end | |
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293 | if session.version >= 1.0 then |
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294 | send(st.stanza("stream:features") |
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295 | :tag("dialback", { xmlns='urn:xmpp:features:dialback' }):tag("optional"):up():up()); |
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296 | end |
148 | 297 | elseif session.direction == "outgoing" then |
298 | -- If we are just using the connection for verifying dialback keys, we won't try and auth it | |
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299 | if not attr.id then error("stream response did not give us a streamid!!!"); end |
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300 | session.streamid = attr.id; |
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301 | |
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302 | -- Send unauthed buffer |
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303 | -- (stanzas which are fine to send before dialback) |
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304 | -- Note that this is *not* the stanza queue (which |
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305 | -- we can only send if auth succeeds) :) |
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306 | local send_buffer = session.send_buffer; |
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307 | if send_buffer and #send_buffer > 0 then |
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308 | log("debug", "Sending s2s send_buffer now..."); |
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309 | for i, data in ipairs(send_buffer) do |
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310 | session.sends2s(tostring(data)); |
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311 | send_buffer[i] = nil; |
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312 | end |
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313 | end |
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314 | session.send_buffer = nil; |
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315 | |
148 | 316 | if not session.dialback_verifying then |
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317 | initiate_dialback(session); |
148 | 318 | else |
319 | mark_connected(session); | |
320 | end | |
321 | end | |
259 | 322 | |
148 | 323 | session.notopen = nil; |
324 | end | |
325 | ||
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326 | function streamclosed(session) |
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327 | (session.log or log)("debug", "</stream:stream>"); |
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328 | if session.sends2s then |
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329 | session.sends2s("</stream:stream>"); |
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330 | end |
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331 | session.notopen = true; |
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332 | end |
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333 | |
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334 | function initiate_dialback(session) |
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335 | -- generate dialback key |
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336 | session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host); |
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337 | 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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338 | session.log("info", "sent dialback key on outgoing s2s stream"); |
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339 | end |
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340 | |
148 | 341 | function generate_dialback(id, to, from) |
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342 | return sha256_hash(id..to..from..dialback_secret, true); |
148 | 343 | end |
344 | ||
345 | function verify_dialback(id, to, from, key) | |
346 | return key == generate_dialback(id, to, from); | |
347 | end | |
348 | ||
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349 | function make_authenticated(session, host) |
148 | 350 | if session.type == "s2sout_unauthed" then |
351 | session.type = "s2sout"; | |
352 | elseif session.type == "s2sin_unauthed" then | |
353 | session.type = "s2sin"; | |
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354 | if host then |
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355 | session.hosts[host].authed = true; |
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356 | end |
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357 | elseif session.type == "s2sin" and host then |
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358 | session.hosts[host].authed = true; |
148 | 359 | else |
360 | return false; | |
361 | end | |
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362 | session.log("debug", "connection %s->%s is now authenticated", session.from_host or "(unknown)", session.to_host or "(unknown)"); |
148 | 363 | |
364 | mark_connected(session); | |
365 | ||
366 | return true; | |
367 | end | |
368 | ||
369 | function mark_connected(session) | |
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370 | local sendq, send = session.sendq, session.sends2s; |
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371 | |
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372 | local from, to = session.from_host, session.to_host; |
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373 | |
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374 | session.log("info", session.direction.." s2s connection "..from.."->"..to.." complete"); |
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375 | |
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376 | local send_to_host = send_to_host; |
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377 | function session.send(data) send_to_host(to, from, data); end |
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378 | |
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379 | |
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380 | if session.direction == "outgoing" then |
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381 | if sendq then |
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382 | session.log("debug", "sending "..#sendq.." queued stanzas across new outgoing connection to "..session.to_host); |
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383 | for i, data in ipairs(sendq) do |
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384 | send(data[1]); |
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385 | sendq[i] = nil; |
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386 | end |
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387 | session.sendq = nil; |
148 | 388 | end |
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389 | |
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390 | session.srv_hosts = nil; |
148 | 391 | end |
392 | end | |
393 | ||
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394 | function destroy_session(session) |
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395 | (session.log or log)("info", "Destroying "..tostring(session.direction).." session "..tostring(session.from_host).."->"..tostring(session.to_host)); |
331 | 396 | |
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397 | if session.direction == "outgoing" then |
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398 | hosts[session.from_host].s2sout[session.to_host] = nil; |
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399 | bounce_sendq(session); |
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400 | elseif session.direction == "incoming" then |
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401 | incoming_s2s[session] = nil; |
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402 | end |
331 | 403 | |
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404 | for k in pairs(session) do |
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405 | if k ~= "trace" then |
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406 | session[k] = nil; |
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407 | end |
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408 | end |
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409 | end |
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410 | |
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411 | return _M; |