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plugins/mod_s2s/s2sout.lib.lua @ 4832:6b3aec1e0d9f
s2smanager, mod_s2s: Move checking DNS timeout option to mod_s2s
author | Kim Alvefur <zash@zash.se> |
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date | Thu, 10 May 2012 23:05:03 +0200 |
parent | 4814:474684c07a3a |
child | 4906:89df1f03546a |
rev | line source |
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s2smanager, mod_s2s, mod_s2s/s2sout: Split connection handling out of s2smanager into mod_s2s, and further split connection logic for s2sout to a module lib, s2sout.lib.lua
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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s2smanager, mod_s2s: Move checking DNS timeout option to mod_s2s
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29 local dns_timeout = module:get_option_number("dns_timeout", 15); |
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30 dns.settimeout(dns_timeout); |
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s2smanager, mod_s2s: Move import of dns_max_depth to mod_s2s
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31 local max_dns_depth = module:get_option_number("dns_max_depth", 3); |
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32 |
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33 local s2sout = {}; |
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34 |
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35 local s2s_listener; |
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36 |
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37 |
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38 function s2sout.set_listener(listener) |
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39 s2s_listener = listener; |
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40 end |
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41 |
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42 local function compare_srv_priorities(a,b) |
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43 return a.priority < b.priority or (a.priority == b.priority and a.weight > b.weight); |
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44 end |
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45 |
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46 local function session_open_stream(session, from, to) |
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47 session.sends2s(st.stanza("stream:stream", { |
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48 xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback', |
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49 ["xmlns:stream"]='http://etherx.jabber.org/streams', |
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50 from=from, to=to, version='1.0', ["xml:lang"]='en'}):top_tag()); |
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51 end |
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52 |
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53 function s2sout.initiate_connection(host_session) |
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54 initialize_filters(host_session); |
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55 host_session.open_stream = session_open_stream; |
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56 |
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57 -- Kick the connection attempting machine into life |
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58 if not s2sout.attempt_connection(host_session) then |
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59 -- Intentionally not returning here, the |
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60 -- session is needed, connected or not |
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61 s2s_destroy_session(host_session); |
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62 end |
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63 |
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64 if not host_session.sends2s then |
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65 -- A sends2s which buffers data (until the stream is opened) |
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66 -- note that data in this buffer will be sent before the stream is authed |
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67 -- and will not be ack'd in any way, successful or otherwise |
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68 local buffer; |
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69 function host_session.sends2s(data) |
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70 if not buffer then |
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71 buffer = {}; |
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72 host_session.send_buffer = buffer; |
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73 end |
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74 log("debug", "Buffering data on unconnected s2sout to %s", tostring(host_session.to_host)); |
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75 buffer[#buffer+1] = data; |
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76 log("debug", "Buffered item %d: %s", #buffer, tostring(data)); |
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77 end |
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78 end |
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79 end |
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80 |
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81 function s2sout.attempt_connection(host_session, err) |
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82 local from_host, to_host = host_session.from_host, host_session.to_host; |
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83 local connect_host, connect_port = to_host and idna_to_ascii(to_host), 5269; |
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84 |
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85 if not connect_host then |
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86 return false; |
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87 end |
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88 |
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89 if not err then -- This is our first attempt |
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90 log("debug", "First attempt to connect to %s, starting with SRV lookup...", to_host); |
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91 host_session.connecting = true; |
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92 local handle; |
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93 handle = adns.lookup(function (answer) |
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94 handle = nil; |
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95 host_session.connecting = nil; |
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96 if answer then |
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97 log("debug", to_host.." has SRV records, handling..."); |
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98 local srv_hosts = {}; |
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99 host_session.srv_hosts = srv_hosts; |
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100 for _, record in ipairs(answer) do |
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101 t_insert(srv_hosts, record.srv); |
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102 end |
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103 if #srv_hosts == 1 and srv_hosts[1].target == "." then |
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104 log("debug", to_host.." does not provide a XMPP service"); |
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105 s2s_destroy_session(host_session, err); -- Nothing to see here |
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106 return; |
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107 end |
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108 t_sort(srv_hosts, compare_srv_priorities); |
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109 |
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110 local srv_choice = srv_hosts[1]; |
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111 host_session.srv_choice = 1; |
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112 if srv_choice then |
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113 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; |
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114 log("debug", "Best record found, will connect to %s:%d", connect_host, connect_port); |
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115 end |
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116 else |
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117 log("debug", to_host.." has no SRV records, falling back to A"); |
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118 end |
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119 -- Try with SRV, or just the plain hostname if no SRV |
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120 local ok, err = s2sout.try_connect(host_session, connect_host, connect_port); |
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121 if not ok then |
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122 if not s2sout.attempt_connection(host_session, err) then |
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123 -- No more attempts will be made |
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124 s2s_destroy_session(host_session, err); |
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125 end |
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126 end |
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127 end, "_xmpp-server._tcp."..connect_host..".", "SRV"); |
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128 |
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129 return true; -- Attempt in progress |
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130 elseif host_session.ip_hosts then |
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131 return s2sout.try_connect(host_session, connect_host, connect_port, err); |
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132 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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133 host_session.srv_choice = host_session.srv_choice + 1; |
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134 local srv_choice = host_session.srv_hosts[host_session.srv_choice]; |
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135 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port; |
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136 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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137 else |
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138 host_session.log("info", "Out of connection options, can't connect to %s", tostring(host_session.to_host)); |
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139 -- We're out of options |
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140 return false; |
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141 end |
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142 |
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143 if not (connect_host and connect_port) then |
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144 -- Likely we couldn't resolve DNS |
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145 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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146 return false; |
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147 end |
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148 |
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149 return s2sout.try_connect(host_session, connect_host, connect_port); |
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150 end |
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151 |
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152 function s2sout.try_next_ip(host_session) |
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153 host_session.connecting = nil; |
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154 host_session.ip_choice = host_session.ip_choice + 1; |
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155 local ip = host_session.ip_hosts[host_session.ip_choice]; |
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156 local ok, err= s2sout.make_connect(host_session, ip.ip, ip.port); |
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157 if not ok then |
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158 if not s2sout.attempt_connection(host_session, err or "closed") then |
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159 err = err and (": "..err) or ""; |
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160 s2s_destroy_session(host_session, "Connection failed"..err); |
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161 end |
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162 end |
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163 end |
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164 |
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165 function s2sout.try_connect(host_session, connect_host, connect_port, err) |
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166 host_session.connecting = true; |
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167 |
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168 if not err then |
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169 local IPs = {}; |
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170 host_session.ip_hosts = IPs; |
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171 local handle4, handle6; |
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172 local has_other = false; |
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173 |
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174 handle4 = adns.lookup(function (reply, err) |
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175 handle4 = nil; |
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176 |
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177 -- COMPAT: This is a compromise for all you CNAME-(ab)users :) |
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178 if not (reply and reply[#reply] and reply[#reply].a) then |
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179 local count = max_dns_depth; |
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180 reply = dns.peek(connect_host, "CNAME", "IN"); |
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181 while count > 0 and reply and reply[#reply] and not reply[#reply].a and reply[#reply].cname do |
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182 log("debug", "Looking up %s (DNS depth is %d)", tostring(reply[#reply].cname), count); |
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183 reply = dns.peek(reply[#reply].cname, "A", "IN") or dns.peek(reply[#reply].cname, "CNAME", "IN"); |
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184 count = count - 1; |
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185 end |
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186 end |
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187 -- end of CNAME resolving |
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188 |
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189 if reply and reply[#reply] and reply[#reply].a then |
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190 for _, ip in ipairs(reply) do |
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191 log("debug", "DNS reply for %s gives us %s", connect_host, ip.a); |
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192 IPs[#IPs+1] = new_ip(ip.a, "IPv4"); |
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193 end |
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194 end |
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195 |
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196 if has_other then |
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197 if #IPs > 0 then |
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198 rfc3484_dest(host_session.ip_hosts, sources); |
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199 for i = 1, #IPs do |
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200 IPs[i] = {ip = IPs[i], port = connect_port}; |
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201 end |
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202 host_session.ip_choice = 0; |
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203 s2sout.try_next_ip(host_session); |
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204 else |
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205 log("debug", "DNS lookup failed to get a response for %s", connect_host); |
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206 host_session.ip_hosts = nil; |
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207 if not s2sout.attempt_connection(host_session, "name resolution failed") then -- Retry if we can |
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208 log("debug", "No other records to try for %s - destroying", host_session.to_host); |
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209 err = err and (": "..err) or ""; |
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210 s2s_destroy_session(host_session, "DNS resolution failed"..err); -- End of the line, we can't |
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211 end |
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212 end |
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213 else |
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214 has_other = true; |
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215 end |
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216 end, connect_host, "A", "IN"); |
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217 |
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218 handle6 = adns.lookup(function (reply, err) |
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219 handle6 = nil; |
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220 |
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221 if reply and reply[#reply] and reply[#reply].aaaa then |
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222 for _, ip in ipairs(reply) do |
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223 log("debug", "DNS reply for %s gives us %s", connect_host, ip.aaaa); |
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224 IPs[#IPs+1] = new_ip(ip.aaaa, "IPv6"); |
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225 end |
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226 end |
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227 |
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228 if has_other then |
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229 if #IPs > 0 then |
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230 rfc3484_dest(host_session.ip_hosts, sources); |
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231 for i = 1, #IPs do |
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232 IPs[i] = {ip = IPs[i], port = connect_port}; |
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233 end |
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234 host_session.ip_choice = 0; |
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235 s2sout.try_next_ip(host_session); |
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236 else |
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237 log("debug", "DNS lookup failed to get a response for %s", connect_host); |
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238 host_session.ip_hosts = nil; |
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239 if not s2sout.attempt_connection(host_session, "name resolution failed") then -- Retry if we can |
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240 log("debug", "No other records to try for %s - destroying", host_session.to_host); |
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241 err = err and (": "..err) or ""; |
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242 s2s_destroy_session(host_session, "DNS resolution failed"..err); -- End of the line, we can't |
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243 end |
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244 end |
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245 else |
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246 has_other = true; |
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247 end |
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248 end, connect_host, "AAAA", "IN"); |
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249 |
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250 return true; |
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251 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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252 s2sout.try_next_ip(host_session); |
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253 else |
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254 host_session.ip_hosts = nil; |
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255 if not s2sout.attempt_connection(host_session, "out of IP addresses") then -- Retry if we can |
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256 log("debug", "No other records to try for %s - destroying", host_session.to_host); |
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257 err = err and (": "..err) or ""; |
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258 s2s_destroy_session(host_session, "Connecting failed"..err); -- End of the line, we can't |
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259 return false; |
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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 s2sout.make_connect(host_session, connect_host, connect_port) |
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267 (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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268 -- Ok, we're going to try to connect |
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269 |
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270 local from_host, to_host = host_session.from_host, host_session.to_host; |
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271 |
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272 local conn, handler; |
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273 if connect_host.proto == "IPv4" then |
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274 conn, handler = socket.tcp(); |
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275 else |
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276 if not socket.tcp6 then |
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277 log("warn", "Could not connect to "..to_host..". Your version of lua-socket does not support IPv6"); |
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278 return false, "no-ipv6"; |
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279 end |
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280 conn, handler = socket.tcp6(); |
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281 end |
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282 |
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283 if not conn then |
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284 log("warn", "Failed to create outgoing connection, system error: %s", handler); |
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285 return false, handler; |
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286 end |
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287 |
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288 conn:settimeout(0); |
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289 local success, err = conn:connect(connect_host.addr, connect_port); |
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290 if not success and err ~= "timeout" then |
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291 log("warn", "s2s connect() to %s (%s:%d) failed: %s", host_session.to_host, connect_host.addr, connect_port, err); |
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292 return false, err; |
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293 end |
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294 |
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295 conn = wrapclient(conn, connect_host.addr, connect_port, s2s_listener, "*a"); |
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296 host_session.conn = conn; |
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297 |
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298 local filter = initialize_filters(host_session); |
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299 local w, log = conn.write, host_session.log; |
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300 host_session.sends2s = function (t) |
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301 log("debug", "sending: %s", (t.top_tag and t:top_tag()) or t:match("^[^>]*>?")); |
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302 if t.name then |
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303 t = filter("stanzas/out", t); |
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304 end |
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305 if t then |
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306 t = filter("bytes/out", tostring(t)); |
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307 if t then |
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308 return w(conn, tostring(t)); |
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309 end |
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310 end |
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311 end |
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312 |
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313 -- Register this outgoing connection so that xmppserver_listener knows about it |
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314 -- otherwise it will assume it is a new incoming connection |
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315 s2s_listener.register_outgoing(conn, host_session); |
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316 |
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317 host_session:open_stream(from_host, to_host); |
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318 |
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319 log("debug", "Connection attempt in progress..."); |
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320 return true; |
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321 end |
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322 |
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323 module:hook_global("service-added", function (event) |
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324 if event.name ~= "s2s" then return end |
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325 |
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326 local s2s_sources = portmanager.get_active_services():get("s2s"); |
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327 if not s2s_sources then |
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328 module:log("warn", "s2s not listening on any ports, outgoing connections may fail"); |
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329 return; |
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330 end |
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331 for source, _ in pairs(s2s_sources) do |
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332 if source == "*" or source == "0.0.0.0" then |
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333 if not socket.local_addresses then |
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334 sources[#sources + 1] = new_ip("0.0.0.0", "IPv4"); |
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335 else |
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336 for _, addr in ipairs(socket.local_addresses("ipv4", true)) do |
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337 sources[#sources + 1] = new_ip(addr, "IPv4"); |
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338 end |
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339 end |
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340 elseif source == "::" then |
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341 if not socket.local_addresses then |
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342 sources[#sources + 1] = new_ip("::", "IPv6"); |
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343 else |
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344 for _, addr in ipairs(socket.local_addresses("ipv6", true)) do |
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345 sources[#sources + 1] = new_ip(addr, "IPv6"); |
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346 end |
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347 end |
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348 else |
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349 sources[#sources + 1] = new_ip(source, (source:find(":") and "IPv6") or "IPv4"); |
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350 end |
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351 end |
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352 end); |
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353 |
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354 return s2sout; |