Mercurial > prosody-modules

annotate mod_onions/mod_onions.lua @ 1701:9b429fc9e8a0

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mod_s2s_auth_dane: Simplify cases where there are only one SRV record
author Kim Alvefur <zash@zash.se>
date Wed, 06 May 2015 00:53:27 +0200
parents e0d8caffa209
children b3e3ad35391a
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1 local wrapclient = require "net.server".wrapclient;
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2 local s2s_new_outgoing = require "core.s2smanager".new_outgoing;
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3 local initialize_filters = require "util.filters".initialize;
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4 local st = require "util.stanza";
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6 local portmanager = require "core.portmanager";
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8 local softreq = require "util.dependencies".softreq;
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10 local bit;
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11 pcall(function() bit = require"bit"; end);
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12 bit = bit or softreq"bit32"
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13 if not bit then module:log("error", "No bit module found. Either LuaJIT 2, lua-bitop or Lua 5.2 is required"); end
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14
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15 local band = bit.band;
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16 local rshift = bit.rshift;
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17 local lshift = bit.lshift;
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19 local byte = string.byte;
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20 local c = string.char;
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22 module:depends("s2s");
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24 local proxy_ip = module:get_option("onions_socks5_host") or "127.0.0.1";
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25 local proxy_port = module:get_option("onions_socks5_port") or 9050;
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26 local forbid_else = module:get_option("onions_only") or false;
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27 local torify_all = module:get_option("onions_tor_all") or false;
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29 local sessions = module:shared("sessions");
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31 -- The socks5listener handles connection while still connecting to the proxy,
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32 -- then it hands them over to the normal listener (in mod_s2s)
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33 local socks5listener = { default_port = proxy_port, default_mode = "*a", default_interface = "*" };
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35 local function socks5_connect_sent(conn, data)
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37 local session = sessions[conn];
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39 if #data < 5 then
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40 session.socks5_buffer = data;
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41 return;
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42 end
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44 request_status = byte(data, 2);
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46 if not request_status == 0x00 then
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47 module:log("debug", "Failed to connect to the SOCKS5 proxy. :(");
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48 session:close(false);
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49 return;
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50 end
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52 module:log("debug", "Succesfully connected to SOCKS5 proxy.");
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54 local response = byte(data, 4);
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56 if response == 0x01 then
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57 if #data < 10 then
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58 -- let's try again when we have enough
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59 session.socks5_buffer = data;
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60 return;
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61 end
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62
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63 -- this means the server tells us to connect on an IPv4 address
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64 local ip1 = byte(data, 5);
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65 local ip2 = byte(data, 6);
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66 local ip3 = byte(data, 7);
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67 local ip4 = byte(data, 8);
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68 local port = band(byte(data, 9), lshift(byte(data, 10), 8));
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69 module:log("debug", "Should connect to: "..ip1.."."..ip2.."."..ip3.."."..ip4..":"..port);
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71 if not (ip1 == 0 and ip2 == 0 and ip3 == 0 and ip4 == 0 and port == 0) then
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72 module:log("debug", "The SOCKS5 proxy tells us to connect to a different IP, don't know how. :(");
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73 session:close(false);
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74 return;
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75 end
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76
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77 -- Now the real s2s listener can take over the connection.
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78 local listener = portmanager.get_service("s2s").listener;
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79
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80 module:log("debug", "SOCKS5 done, handing over listening to "..tostring(listener));
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81
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82 session.socks5_handler = nil;
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83 session.socks5_buffer = nil;
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84
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85 local w, log = conn.send, session.log;
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86
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87 local filter = initialize_filters(session);
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88
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89 session.version = 1;
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90
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91 session.sends2s = function (t)
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92 log("debug", "sending (s2s over socks5): %s", (t.top_tag and t:top_tag()) or t:match("^[^>]*>?"));
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93 if t.name then
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94 t = filter("stanzas/out", t);
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95 end
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96 if t then
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97 t = filter("bytes/out", tostring(t));
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98 if t then
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99 return conn:write(tostring(t));
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100 end
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101 end
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102 end
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103
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104 session.open_stream = function ()
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105 session.sends2s(st.stanza("stream:stream", {
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106 xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback',
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107 ["xmlns:stream"]='http://etherx.jabber.org/streams',
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diff changeset
108 from=session.from_host, to=session.to_host, version='1.0', ["xml:lang"]='en'}):top_tag());
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109 end
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110
1060
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111 conn.setlistener(conn, listener);
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112
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113 listener.register_outgoing(conn, session);
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114
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115 listener.onconnect(conn);
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116 end
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117 end
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118
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119 local function socks5_handshake_sent(conn, data)
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120
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121 local session = sessions[conn];
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122
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123 if #data < 2 then
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124 session.socks5_buffer = data;
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125 return;
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126 end
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127
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128 -- version, method
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129 local request_status = byte(data, 2);
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130
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131 module:log("debug", "SOCKS version: "..byte(data, 1));
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132 module:log("debug", "Response: "..request_status);
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133
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134 if not request_status == 0x00 then
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135 module:log("debug", "Failed to connect to the SOCKS5 proxy. :( It seems to require authentication.");
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136 session:close(false);
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137 return;
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138 end
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139
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140 module:log("debug", "Sending connect message.");
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141
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142 -- version 5, connect, (reserved), type: domainname, (length, hostname), port
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143 conn:write(c(5) .. c(1) .. c(0) .. c(3) .. c(#session.socks5_to) .. session.socks5_to);
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144 conn:write(c(rshift(session.socks5_port, 8)) .. c(band(session.socks5_port, 0xff)));
1060
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145
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146 session.socks5_handler = socks5_connect_sent;
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147 end
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148
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149 function socks5listener.onconnect(conn)
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150 module:log("debug", "Connected to SOCKS5 proxy, sending SOCKS5 handshake.");
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151
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152 -- Socks version 5, 1 method, no auth
1299
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153 conn:write(c(5) .. c(1) .. c(0));
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154
1060
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155 sessions[conn].socks5_handler = socks5_handshake_sent;
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156 end
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157
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158 function socks5listener.register_outgoing(conn, session)
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159 session.direction = "outgoing";
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160 sessions[conn] = session;
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161 end
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162
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163 function socks5listener.ondisconnect(conn, err)
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164 sessions[conn] = nil;
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165 end
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166
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167 function socks5listener.onincoming(conn, data)
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168 local session = sessions[conn];
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169
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170 if session.socks5_buffer then
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171 data = session.socks5_buffer .. data;
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172 end
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173
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174 if session.socks5_handler then
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175 session.socks5_handler(conn, data);
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176 end
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177 end
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178
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179 local function connect_socks5(host_session, connect_host, connect_port)
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180
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181 local conn, handler = socket.tcp();
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182
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183 module:log("debug", "Connecting to " .. connect_host .. ":" .. connect_port);
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184
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185 -- this is not necessarily the same as .to_host (it can be that this is a SRV record)
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186 host_session.socks5_to = connect_host;
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187 host_session.socks5_port = connect_port;
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188
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189 conn:settimeout(0);
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190
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191 local success, err = conn:connect(proxy_ip, proxy_port);
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192
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193 conn = wrapclient(conn, connect_host, connect_port, socks5listener, "*a");
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194
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195 socks5listener.register_outgoing(conn, host_session);
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196
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197 host_session.conn = conn;
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198 end
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199
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200 local function bounce_sendq(session, reason)
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201 local sendq = session.sendq;
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202 if not sendq then return; end
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diff changeset
203 session.log("info", "sending error replies for "..#sendq.." queued stanzas because of failed outgoing connection to "..tostring(session.to_host));
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204 local dummy = {
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205 type = "s2sin";
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206 send = function(s)
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207 (session.log or log)("error", "Replying to to an s2s error reply, please report this! Traceback: %s", traceback());
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208 end;
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209 dummy = true;
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210 };
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211 for i, data in ipairs(sendq) do
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212 local reply = data[2];
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213 if reply and not(reply.attr.xmlns) then
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214 reply.attr.type = "error";
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215 reply:tag("error", {type = "cancel"})
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216 :tag("remote-server-not-found", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up();
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217 if reason then
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218 reply:tag("text", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"})
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219 :text("Server-to-server connection failed: "..reason):up();
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220 end
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221 core_process_stanza(dummy, reply);
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222 end
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223 sendq[i] = nil;
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224 end
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225 session.sendq = nil;
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226 end
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227
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228 -- Try to intercept anything to *.onion
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229 local function route_to_onion(event)
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230 local stanza = event.stanza;
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231
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232 if not event.to_host:find(".onion(.?)$") then
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233 if forbid_else then
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234 module:log("debug", event.to_host .. " is not an onion. Blocking it.");
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235 return false;
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236 elseif not torify_all then
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237 return;
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238 end
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239 end
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240
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241 module:log("debug", "Onion routing something to ".. event.to_host);
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242
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243 if hosts[event.from_host].s2sout[event.to_host] then
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244 return;
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245 end
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246
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247 local host_session = s2s_new_outgoing(event.from_host, event.to_host);
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248
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249 host_session.bounce_sendq = bounce_sendq;
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250 host_session.sendq = { {tostring(stanza), stanza.attr and stanza.attr.type ~= "error" and stanza.attr.type ~= "result" and st.reply(stanza)} };
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251
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252 hosts[event.from_host].s2sout[event.to_host] = host_session;
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253
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254 connect_socks5(host_session, event.to_host, 5269);
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255
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256 return true;
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257 end
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258
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259 module:log("debug", "Onions ready and loaded");
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260
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261 hosts[module.host].events.add_handler("route/remote", route_to_onion, 200);