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plugins/s2s/s2sout.lib.lua @ 4791:c01066f27a5d
s2sout.lib: Check whether lua-socket supports IPv6
author | Florian Zeitz <florob@babelmonkeys.de> |
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date | Sat, 28 Apr 2012 22:34:05 +0200 |
parent | 4756:f8ddaaa08a8e |
rev | line source |
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Matthew Wild <mwild1@gmail.com>
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1 -- Prosody IM |
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2 -- Copyright (C) 2008-2010 Matthew Wild |
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3 -- Copyright (C) 2008-2010 Waqas Hussain |
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4 -- |
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5 -- This project is MIT/X11 licensed. Please see the |
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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 --- Module containing all the logic for connecting to a remote server |
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10 |
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mod_s2s: Collect s2s sources from portmanager and get local address if necessary
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11 local portmanager = require "core.portmanager"; |
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12 local wrapclient = require "net.server".wrapclient; |
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13 local initialize_filters = require "util.filters".initialize; |
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14 local idna_to_ascii = require "util.encodings".idna.to_ascii; |
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15 local new_ip = require "util.ip".new_ip; |
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16 local rfc3484_dest = require "util.rfc3484".destination; |
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17 local socket = require "socket"; |
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18 local adns = require "net.adns"; |
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19 local dns = require "net.dns"; |
4573 | 20 local t_insert, t_sort, ipairs = table.insert, table.sort, ipairs; |
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21 local st = require "util.stanza"; |
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22 |
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23 local s2s_destroy_session = require "core.s2smanager".destroy_session; |
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24 |
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25 local log = module._log; |
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26 |
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27 local sources = {}; |
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28 |
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29 local max_dns_depth = module:get_option_number("dns_max_depth", 3); |
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30 |
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31 local s2sout = {}; |
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32 |
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33 local s2s_listener; |
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34 |
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35 |
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36 function s2sout.set_listener(listener) |
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37 s2s_listener = listener; |
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38 end |
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39 |
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40 local function compare_srv_priorities(a,b) |
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41 return a.priority < b.priority or (a.priority == b.priority and a.weight > b.weight); |
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42 end |
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43 |
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44 local function session_open_stream(session, from, to) |
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45 session.sends2s(st.stanza("stream:stream", { |
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46 xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback', |
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47 ["xmlns:stream"]='http://etherx.jabber.org/streams', |
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48 from=from, to=to, version='1.0', ["xml:lang"]='en'}):top_tag()); |
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49 end |
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50 |
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51 function s2sout.initiate_connection(host_session) |
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52 initialize_filters(host_session); |
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53 host_session.open_stream = session_open_stream; |
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54 |
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55 -- Kick the connection attempting machine into life |
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56 if not s2sout.attempt_connection(host_session) then |
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57 -- Intentionally not returning here, the |
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58 -- session is needed, connected or not |
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59 s2s_destroy_session(host_session); |
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60 end |
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61 |
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62 if not host_session.sends2s then |
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63 -- A sends2s which buffers data (until the stream is opened) |
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64 -- note that data in this buffer will be sent before the stream is authed |
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65 -- and will not be ack'd in any way, successful or otherwise |
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66 local buffer; |
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67 function host_session.sends2s(data) |
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68 if not buffer then |
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69 buffer = {}; |
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70 host_session.send_buffer = buffer; |
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71 end |
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72 log("debug", "Buffering data on unconnected s2sout to %s", tostring(host_session.to_host)); |
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73 buffer[#buffer+1] = data; |
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74 log("debug", "Buffered item %d: %s", #buffer, tostring(data)); |
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75 end |
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76 end |
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77 end |
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78 |
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79 function s2sout.attempt_connection(host_session, err) |
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80 local from_host, to_host = host_session.from_host, host_session.to_host; |
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81 local connect_host, connect_port = to_host and idna_to_ascii(to_host), 5269; |
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82 |
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83 if not connect_host then |
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84 return false; |
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85 end |
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86 |
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87 if not err then -- This is our first attempt |
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88 log("debug", "First attempt to connect to %s, starting with SRV lookup...", to_host); |
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89 host_session.connecting = true; |
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90 local handle; |
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91 handle = adns.lookup(function (answer) |
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92 handle = nil; |
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93 host_session.connecting = nil; |
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94 if answer then |
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95 log("debug", to_host.." has SRV records, handling..."); |
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96 local srv_hosts = {}; |
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97 host_session.srv_hosts = srv_hosts; |
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98 for _, record in ipairs(answer) do |
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99 t_insert(srv_hosts, record.srv); |
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100 end |
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101 if #srv_hosts == 1 and srv_hosts[1].target == "." then |
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102 log("debug", to_host.." does not provide a XMPP service"); |
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103 s2s_destroy_session(host_session, err); -- Nothing to see here |
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104 return; |
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105 end |
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106 t_sort(srv_hosts, compare_srv_priorities); |
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107 |
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108 local srv_choice = srv_hosts[1]; |
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109 host_session.srv_choice = 1; |
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110 if srv_choice then |
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111 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; |
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112 log("debug", "Best record found, will connect to %s:%d", connect_host, connect_port); |
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113 end |
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114 else |
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115 log("debug", to_host.." has no SRV records, falling back to A"); |
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116 end |
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117 -- Try with SRV, or just the plain hostname if no SRV |
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118 local ok, err = s2sout.try_connect(host_session, connect_host, connect_port); |
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119 if not ok then |
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120 if not s2sout.attempt_connection(host_session, err) then |
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121 -- No more attempts will be made |
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122 s2s_destroy_session(host_session, err); |
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123 end |
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124 end |
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125 end, "_xmpp-server._tcp."..connect_host..".", "SRV"); |
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126 |
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127 return true; -- Attempt in progress |
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128 elseif host_session.ip_hosts then |
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129 return s2sout.try_connect(host_session, connect_host, connect_port, err); |
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130 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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131 host_session.srv_choice = host_session.srv_choice + 1; |
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132 local srv_choice = host_session.srv_hosts[host_session.srv_choice]; |
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133 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; |
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134 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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135 else |
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136 host_session.log("info", "Out of connection options, can't connect to %s", tostring(host_session.to_host)); |
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137 -- We're out of options |
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138 return false; |
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139 end |
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140 |
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141 if not (connect_host and connect_port) then |
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142 -- Likely we couldn't resolve DNS |
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143 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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144 return false; |
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145 end |
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146 |
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147 return s2sout.try_connect(host_session, connect_host, connect_port); |
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148 end |
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149 |
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150 function s2sout.try_next_ip(host_session) |
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151 host_session.connecting = nil; |
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152 host_session.ip_choice = host_session.ip_choice + 1; |
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153 local ip = host_session.ip_hosts[host_session.ip_choice]; |
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154 local ok, err= s2sout.make_connect(host_session, ip.ip, ip.port); |
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155 if not ok then |
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156 if not s2sout.attempt_connection(host_session, err or "closed") then |
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157 err = err and (": "..err) or ""; |
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158 s2s_destroy_session(host_session, "Connection failed"..err); |
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159 end |
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160 end |
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161 end |
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162 |
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163 function s2sout.try_connect(host_session, connect_host, connect_port, err) |
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164 host_session.connecting = true; |
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165 |
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166 if not err then |
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167 local IPs = {}; |
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168 host_session.ip_hosts = IPs; |
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169 local handle4, handle6; |
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170 local has_other = false; |
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171 |
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172 handle4 = adns.lookup(function (reply, err) |
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173 handle4 = nil; |
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174 |
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175 -- COMPAT: This is a compromise for all you CNAME-(ab)users :) |
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176 if not (reply and reply[#reply] and reply[#reply].a) then |
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177 local count = max_dns_depth; |
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178 reply = dns.peek(connect_host, "CNAME", "IN"); |
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179 while count > 0 and reply and reply[#reply] and not reply[#reply].a and reply[#reply].cname do |
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180 log("debug", "Looking up %s (DNS depth is %d)", tostring(reply[#reply].cname), count); |
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181 reply = dns.peek(reply[#reply].cname, "A", "IN") or dns.peek(reply[#reply].cname, "CNAME", "IN"); |
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182 count = count - 1; |
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183 end |
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184 end |
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185 -- end of CNAME resolving |
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186 |
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187 if reply and reply[#reply] and reply[#reply].a then |
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188 for _, ip in ipairs(reply) do |
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189 log("debug", "DNS reply for %s gives us %s", connect_host, ip.a); |
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190 IPs[#IPs+1] = new_ip(ip.a, "IPv4"); |
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191 end |
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192 end |
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193 |
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194 if has_other then |
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195 if #IPs > 0 then |
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196 rfc3484_dest(host_session.ip_hosts, sources); |
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197 for i = 1, #IPs do |
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198 IPs[i] = {ip = IPs[i], port = connect_port}; |
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199 end |
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200 host_session.ip_choice = 0; |
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201 s2sout.try_next_ip(host_session); |
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202 else |
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203 log("debug", "DNS lookup failed to get a response for %s", connect_host); |
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204 host_session.ip_hosts = nil; |
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205 if not s2sout.attempt_connection(host_session, "name resolution failed") then -- Retry if we can |
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206 log("debug", "No other records to try for %s - destroying", host_session.to_host); |
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207 err = err and (": "..err) or ""; |
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208 s2s_destroy_session(host_session, "DNS resolution failed"..err); -- End of the line, we can't |
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209 end |
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210 end |
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211 else |
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212 has_other = true; |
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213 end |
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214 end, connect_host, "A", "IN"); |
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215 |
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216 handle6 = adns.lookup(function (reply, err) |
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217 handle6 = nil; |
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218 |
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219 if reply and reply[#reply] and reply[#reply].aaaa then |
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220 for _, ip in ipairs(reply) do |
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221 log("debug", "DNS reply for %s gives us %s", connect_host, ip.aaaa); |
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222 IPs[#IPs+1] = new_ip(ip.aaaa, "IPv6"); |
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223 end |
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224 end |
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225 |
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226 if has_other then |
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227 if #IPs > 0 then |
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228 rfc3484_dest(host_session.ip_hosts, sources); |
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229 for i = 1, #IPs do |
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230 IPs[i] = {ip = IPs[i], port = connect_port}; |
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231 end |
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232 host_session.ip_choice = 0; |
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233 s2sout.try_next_ip(host_session); |
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234 else |
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235 log("debug", "DNS lookup failed to get a response for %s", connect_host); |
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236 host_session.ip_hosts = nil; |
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237 if not s2sout.attempt_connection(host_session, "name resolution failed") then -- Retry if we can |
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238 log("debug", "No other records to try for %s - destroying", host_session.to_host); |
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239 err = err and (": "..err) or ""; |
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240 s2s_destroy_session(host_session, "DNS resolution failed"..err); -- End of the line, we can't |
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241 end |
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242 end |
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243 else |
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244 has_other = true; |
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245 end |
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246 end, connect_host, "AAAA", "IN"); |
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247 |
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248 return true; |
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249 elseif host_session.ip_hosts and #host_session.ip_hosts > host_session.ip_choice then -- Not our first attempt, and we also have IPs left to try |
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250 s2sout.try_next_ip(host_session); |
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251 else |
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252 host_session.ip_hosts = nil; |
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253 if not s2sout.attempt_connection(host_session, "out of IP addresses") then -- Retry if we can |
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254 log("debug", "No other records to try for %s - destroying", host_session.to_host); |
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255 err = err and (": "..err) or ""; |
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256 s2s_destroy_session(host_session, "Connecting failed"..err); -- End of the line, we can't |
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257 return false; |
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258 end |
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259 end |
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260 |
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261 return true; |
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262 end |
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263 |
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264 function s2sout.make_connect(host_session, connect_host, connect_port) |
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265 (host_session.log or log)("info", "Beginning new connection attempt to %s ([%s]:%d)", host_session.to_host, connect_host.addr, connect_port); |
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266 -- Ok, we're going to try to connect |
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267 |
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268 local from_host, to_host = host_session.from_host, host_session.to_host; |
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269 |
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270 local conn, handler; |
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271 if connect_host.proto == "IPv4" then |
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272 conn, handler = socket.tcp(); |
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273 else |
4791
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274 if not socket.tcp6 then |
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275 log("warn", "Could not connect to "..to_host..". Your version of lua-socket does not support IPv6"); |
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276 return false, "no-ipv6"; |
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277 end |
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278 conn, handler = socket.tcp6(); |
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279 end |
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280 |
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281 if not conn then |
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282 log("warn", "Failed to create outgoing connection, system error: %s", handler); |
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283 return false, handler; |
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284 end |
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285 |
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286 conn:settimeout(0); |
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287 local success, err = conn:connect(connect_host.addr, connect_port); |
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288 if not success and err ~= "timeout" then |
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289 log("warn", "s2s connect() to %s (%s:%d) failed: %s", host_session.to_host, connect_host.addr, connect_port, err); |
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290 return false, err; |
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291 end |
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292 |
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293 conn = wrapclient(conn, connect_host.addr, connect_port, s2s_listener, "*a"); |
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294 host_session.conn = conn; |
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295 |
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296 local filter = initialize_filters(host_session); |
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297 local w, log = conn.write, host_session.log; |
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298 host_session.sends2s = function (t) |
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299 log("debug", "sending: %s", (t.top_tag and t:top_tag()) or t:match("^[^>]*>?")); |
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300 if t.name then |
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301 t = filter("stanzas/out", t); |
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302 end |
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303 if t then |
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304 t = filter("bytes/out", tostring(t)); |
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305 if t then |
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306 return w(conn, tostring(t)); |
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307 end |
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308 end |
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309 end |
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310 |
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311 -- Register this outgoing connection so that xmppserver_listener knows about it |
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312 -- otherwise it will assume it is a new incoming connection |
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313 s2s_listener.register_outgoing(conn, host_session); |
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314 |
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315 host_session:open_stream(from_host, to_host); |
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316 |
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317 log("debug", "Connection attempt in progress..."); |
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318 return true; |
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319 end |
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320 |
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321 module:hook_global("service-added", function (event) |
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322 if event.name ~= "s2s" then return end |
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323 |
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324 local s2s_sources = portmanager.get_active_services():get("s2s"); |
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325 if not s2s_sources then |
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326 module:log("warn", "s2s not listening on any ports, outgoing connections may fail"); |
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327 return; |
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328 end |
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329 for source, _ in pairs(s2s_sources) do |
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330 if source == "*" or source == "0.0.0.0" then |
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331 if not socket.local_addresses then |
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332 sources[#sources + 1] = new_ip("0.0.0.0", "IPv4"); |
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333 else |
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334 for _, addr in ipairs(socket.local_addresses("ipv4", true)) do |
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335 sources[#sources + 1] = new_ip(addr, "IPv4"); |
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336 end |
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337 end |
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338 elseif source == "::" then |
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339 if not socket.local_addresses then |
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340 sources[#sources + 1] = new_ip("::", "IPv6"); |
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341 else |
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342 for _, addr in ipairs(socket.local_addresses("ipv6", true)) do |
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343 sources[#sources + 1] = new_ip(addr, "IPv6"); |
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344 end |
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345 end |
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346 else |
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347 sources[#sources + 1] = new_ip(source, (source:find(":") and "IPv6") or "IPv4"); |
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348 end |
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349 end |
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350 end); |
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351 |
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352 return s2sout; |