Sun, 07 Dec 2008 02:56:17 +0500
Removed pre-multitable code from module manager
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1 | -- Prosody IM v0.1 |
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2 | -- Copyright (C) 2008 Matthew Wild |
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3 | -- Copyright (C) 2008 Waqas Hussain |
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4 | -- |
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5 | -- This program is free software; you can redistribute it and/or |
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6 | -- modify it under the terms of the GNU General Public License |
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7 | -- as published by the Free Software Foundation; either version 2 |
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8 | -- of the License, or (at your option) any later version. |
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9 | -- |
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10 | -- This program is distributed in the hope that it will be useful, |
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11 | -- but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 | -- GNU General Public License for more details. |
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14 | -- |
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15 | -- You should have received a copy of the GNU General Public License |
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16 | -- along with this program; if not, write to the Free Software |
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17 | -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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18 | -- |
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19 | |
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20 | |
148 | 21 | |
22 | local hosts = hosts; | |
23 | local sessions = sessions; | |
24 | local socket = require "socket"; | |
25 | local format = string.format; | |
337 | 26 | local t_insert, t_sort = table.insert, table.sort; |
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27 | local get_traceback = debug.traceback; |
148 | 28 | local tostring, pairs, ipairs, getmetatable, print, newproxy, error, tonumber |
29 | = tostring, pairs, ipairs, getmetatable, print, newproxy, error, tonumber; | |
30 | ||
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31 | local idna_to_ascii = require "util.encodings".idna.to_ascii; |
148 | 32 | local connlisteners_get = require "net.connlisteners".get; |
33 | local wraptlsclient = require "net.server".wraptlsclient; | |
34 | local modulemanager = require "core.modulemanager"; | |
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35 | local st = require "stanza"; |
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36 | local stanza = st.stanza; |
148 | 37 | |
38 | local uuid_gen = require "util.uuid".generate; | |
39 | ||
40 | local logger_init = require "util.logger".init; | |
41 | ||
42 | local log = logger_init("s2smanager"); | |
43 | ||
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44 | local sha256_hash = require "util.hashes".sha256; |
148 | 45 | |
46 | local dialback_secret = "This is very secret!!! Ha!"; | |
47 | ||
337 | 48 | local dns = require "net.dns"; |
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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 | ||
148 | 54 | function send_to_host(from_host, to_host, data) |
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55 | local host = hosts[from_host].s2sout[to_host]; |
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56 | if host then |
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57 | -- We have a connection to this host already |
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58 | 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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59 | (host.log or log)("debug", "trying to send over unauthed s2sout to "..to_host); |
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60 | if not host.notopen and not host.dialback_key then |
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61 | host.log("debug", "dialback had not been initiated"); |
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62 | initiate_dialback(host); |
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63 | end |
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64 | |
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65 | -- Queue stanza until we are able to send it |
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66 | if host.sendq then t_insert(host.sendq, tostring(data)); |
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67 | else host.sendq = { tostring(data) }; end |
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68 | host.log("debug", "stanza [%s] queued ", data.name); |
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69 | elseif host.type == "local" or host.type == "component" then |
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70 | log("error", "Trying to send a stanza to ourselves??") |
256 | 71 | log("error", "Traceback: %s", get_traceback()); |
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72 | log("error", "Stanza: %s", tostring(data)); |
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73 | else |
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74 | (host.log or log)("debug", "going to send stanza to "..to_host.." from "..from_host); |
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75 | -- FIXME |
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76 | if host.from_host ~= from_host then |
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77 | log("error", "WARNING! This might, possibly, be a bug, but it might not..."); |
331 | 78 | log("error", "We are going to send from %s instead of %s", tostring(host.from_host), tostring(from_host)); |
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79 | end |
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80 | host.sends2s(data); |
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81 | host.log("debug", "stanza sent over "..host.type); |
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82 | end |
148 | 83 | else |
84 | log("debug", "opening a new outgoing connection for this stanza"); | |
85 | local host_session = new_outgoing(from_host, to_host); | |
86 | -- Store in buffer | |
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87 | host_session.sendq = { tostring(data) }; |
148 | 88 | end |
89 | end | |
90 | ||
91 | local open_sessions = 0; | |
92 | ||
93 | function new_incoming(conn) | |
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94 | local session = { conn = conn, type = "s2sin_unauthed", direction = "incoming" }; |
148 | 95 | if true then |
96 | session.trace = newproxy(true); | |
97 | getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; print("s2s session got collected, now "..open_sessions.." s2s sessions are allocated") end; | |
98 | end | |
99 | open_sessions = open_sessions + 1; | |
343 | 100 | local w, log = conn.write, logger_init("s2sin"..tostring(conn):match("[a-f0-9]+$")); |
101 | session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end | |
148 | 102 | return session; |
103 | end | |
104 | ||
105 | function new_outgoing(from_host, to_host) | |
106 | local host_session = { to_host = to_host, from_host = from_host, notopen = true, type = "s2sout_unauthed", direction = "outgoing" }; | |
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107 | hosts[from_host].s2sout[to_host] = host_session; |
148 | 108 | |
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109 | local log; |
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110 | do |
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111 | local conn_name = "s2sout"..tostring(host_session):match("[a-f0-9]*$"); |
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112 | log = logger_init(conn_name); |
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113 | host_session.log = log; |
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114 | end |
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115 | |
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116 | attempt_connection(host_session); |
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117 | |
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118 | return host_session; |
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119 | end |
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120 | |
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121 | |
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122 | function attempt_connection(host_session, err) |
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123 | local from_host, to_host = host_session.from_host, host_session.to_host; |
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124 | local conn, handler = socket.tcp() |
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125 | |
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126 | local connect_host, connect_port = idna_to_ascii(to_host), 5269; |
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127 | |
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128 | if not err then -- This is our first attempt |
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129 | local answer = dns.lookup("_xmpp-server._tcp."..connect_host..".", "SRV"); |
337 | 130 | |
131 | if answer then | |
132 | log("debug", to_host.." has SRV records, handling..."); | |
133 | local srv_hosts = {}; | |
134 | host_session.srv_hosts = srv_hosts; | |
135 | for _, record in ipairs(answer) do | |
136 | t_insert(srv_hosts, record.srv); | |
137 | end | |
138 | t_sort(srv_hosts, compare_srv_priorities); | |
139 | ||
140 | local srv_choice = srv_hosts[1]; | |
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141 | host_session.srv_choice = 1; |
337 | 142 | if srv_choice then |
143 | connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; | |
144 | log("debug", "Best record found, will connect to %s:%d", connect_host, connect_port); | |
145 | end | |
146 | end | |
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147 | 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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148 | host_session.srv_choice = host_session.srv_choice + 1; |
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149 | local srv_choice = host_session.srv_hosts[host_session.srv_choice]; |
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150 | connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; |
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151 | host_session.log("debug", "Connection failed (%s). Attempt #%d: This time to %s:%d", tostring(err), host_session.srv_choice, connect_host, connect_port); |
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152 | else |
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153 | host_session.log("debug", "Out of connection options, can't connect to %s", tostring(host_session.to_host)); |
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154 | -- We're out of options |
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155 | return false; |
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156 | end |
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157 | |
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158 | -- Ok, we're going to try to connect |
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159 | conn:settimeout(0); |
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160 | local success, err = conn:connect(connect_host, connect_port); |
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161 | if not success and err ~= "timeout" then |
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162 | log("warn", "s2s connect() failed: %s", err); |
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163 | end |
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164 | |
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165 | local cl = connlisteners_get("xmppserver"); |
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166 | conn = wraptlsclient(cl, conn, connect_host, connect_port, 0, cl.default_mode or 1, hosts[from_host].ssl_ctx ); |
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167 | host_session.conn = conn; |
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168 | |
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169 | -- Register this outgoing connection so that xmppserver_listener knows about it |
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170 | -- otherwise it will assume it is a new incoming connection |
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171 | cl.register_outgoing(conn, host_session); |
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172 | |
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173 | local w = conn.write; |
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174 | host_session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end |
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175 | |
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176 | 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'>]], from_host, to_host)); |
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177 | return true; |
148 | 178 | end |
179 | ||
180 | function streamopened(session, attr) | |
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181 | local send = session.sends2s; |
148 | 182 | |
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183 | -- TODO: #29: SASL/TLS on s2s streams |
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184 | session.version = 0; --tonumber(attr.version) or 0; |
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185 | |
148 | 186 | if session.version >= 1.0 and not (attr.to and attr.from) then |
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187 | --print("to: "..tostring(attr.to).." from: "..tostring(attr.from)); |
148 | 188 | log("warn", (session.to_host or "(unknown)").." failed to specify 'to' or 'from' hostname as per RFC"); |
189 | end | |
190 | ||
191 | if session.direction == "incoming" then | |
192 | -- Send a reply stream header | |
193 | ||
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194 | --for k,v in pairs(attr) do print("", tostring(k), ":::", tostring(v)); end |
148 | 195 | |
196 | session.to_host = attr.to; | |
197 | session.from_host = attr.from; | |
198 | ||
199 | session.streamid = uuid_gen(); | |
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200 | (session.log or log)("debug", "incoming s2s received <stream:stream>"); |
148 | 201 | send("<?xml version='1.0'?>"); |
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202 | send(stanza("stream:stream", { xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback', ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.to_host }):top_tag()); |
331 | 203 | if session.to_host and not hosts[session.to_host] then |
204 | -- Attempting to connect to a host we don't serve | |
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205 | session:close({ condition = "host-unknown"; text = "This host does not serve "..session.to_host }); |
331 | 206 | return; |
207 | end | |
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208 | if session.version >= 1.0 then |
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209 | send(st.stanza("stream:features") |
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210 | :tag("dialback", { xmlns='urn:xmpp:features:dialback' }):tag("optional"):up():up()); |
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211 | end |
148 | 212 | elseif session.direction == "outgoing" then |
213 | -- If we are just using the connection for verifying dialback keys, we won't try and auth it | |
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214 | if not attr.id then error("stream response did not give us a streamid!!!"); end |
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215 | session.streamid = attr.id; |
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216 | |
148 | 217 | if not session.dialback_verifying then |
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218 | initiate_dialback(session); |
148 | 219 | else |
220 | mark_connected(session); | |
221 | end | |
222 | end | |
259 | 223 | |
148 | 224 | session.notopen = nil; |
225 | end | |
226 | ||
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227 | function initiate_dialback(session) |
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228 | -- generate dialback key |
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229 | session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host); |
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230 | 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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231 | session.log("info", "sent dialback key on outgoing s2s stream"); |
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232 | end |
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233 | |
148 | 234 | function generate_dialback(id, to, from) |
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235 | return sha256_hash(id..to..from..dialback_secret, true); |
148 | 236 | end |
237 | ||
238 | function verify_dialback(id, to, from, key) | |
239 | return key == generate_dialback(id, to, from); | |
240 | end | |
241 | ||
242 | function make_authenticated(session) | |
243 | if session.type == "s2sout_unauthed" then | |
244 | session.type = "s2sout"; | |
245 | elseif session.type == "s2sin_unauthed" then | |
246 | session.type = "s2sin"; | |
247 | else | |
248 | return false; | |
249 | end | |
250 | session.log("info", "connection is now authenticated"); | |
251 | ||
252 | mark_connected(session); | |
253 | ||
254 | return true; | |
255 | end | |
256 | ||
257 | function mark_connected(session) | |
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258 | local sendq, send = session.sendq, session.sends2s; |
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259 | |
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260 | local from, to = session.from_host, session.to_host; |
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261 | |
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262 | session.log("debug", session.direction.." s2s connection "..from.."->"..to.." is now complete"); |
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263 | |
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264 | local send_to_host = send_to_host; |
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265 | function session.send(data) send_to_host(to, from, data); end |
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266 | |
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267 | |
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268 | if session.direction == "outgoing" then |
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269 | if sendq then |
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270 | session.log("debug", "sending "..#sendq.." queued stanzas across new outgoing connection to "..session.to_host); |
190
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271 | for i, data in ipairs(sendq) do |
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272 | send(data); |
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273 | sendq[i] = nil; |
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274 | end |
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275 | session.sendq = nil; |
148 | 276 | end |
277 | end | |
278 | end | |
279 | ||
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280 | function destroy_session(session) |
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281 | (session.log or log)("info", "Destroying "..tostring(session.direction).." session "..tostring(session.from_host).."->"..tostring(session.to_host)); |
331 | 282 | |
283 | -- FIXME: Flush sendq here/report errors to originators | |
284 | ||
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285 | if session.direction == "outgoing" then |
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286 | hosts[session.from_host].s2sout[session.to_host] = nil; |
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287 | end |
331 | 288 | |
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289 | for k in pairs(session) do |
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290 | if k ~= "trace" then |
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291 | session[k] = nil; |
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292 | end |
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293 | end |
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294 | end |
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295 | |
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296 | return _M; |