Mercurial > prosody-modules

annotate mod_onions/mod_onions.lua @ 1060:25b83ed7838a

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mod_onions: Added mod_onions. This module allows Prosody to make s2s connections to Tor hidden services. * Requires a local install of Tor. * Does not require the initiating server to be a hidden service (though dialback will be tricky).
author Thijs Alkemade <me@thijsalkema.de>
date Mon, 10 Jun 2013 20:59:39 +0200
parents
children f4031e7ccec1
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1060
25b83ed7838a mod_onions: Added mod_onions. This module allows Prosody to make s2s connections to Tor hidden services.
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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 bit = require "bit32";
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5 local st = require "util.stanza";
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6 local portmanager = require "core.portmanager";
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7 local byte = string.byte;
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8 local c = string.char;
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9
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10 local proxy_ip = module:get_option("onions_socks5_host") or "127.0.0.1";
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11 local proxy_port = module:get_option("onions_socks5_port") or "9050";
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12 local forbid_else = module:get_option("onions_only") or false;
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13
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14 local sessions = module:shared("sessions");
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15
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16 -- The socks5listener handles connection while still connecting to the proxy,
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17 -- then it hands them over to the normal listener (in mod_s2s)
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18 local socks5listener = { default_port = tonumber(proxy_port), default_mode = "*a", default_interface = "*" };
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19
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20 local function socks5_connect_sent(conn, data)
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21
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22 local session = sessions[conn];
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23
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24 if #data < 5 then
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25 session.socks5_buffer = data;
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26 return;
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27 end
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28
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29 request_status = byte(data, 2);
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30
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31 if not request_status == 0x00 then
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32 module:log("debug", "Failed to connect to the SOCKS5 proxy. :(");
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33 session:close(false);
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34 return;
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35 end
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36
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37 module:log("debug", "Succesfully connected to SOCKS5 proxy.");
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38
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39 local response = byte(data, 4);
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40
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41 if response == 0x01 then
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42 if #data < 10 then
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43 -- let's try again when we have enough
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44 session.socks5_buffer = data;
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45 return;
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46 end
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47
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48 -- this means the server tells us to connect on an IPv4 address
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49 local ip1 = byte(data, 5);
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50 local ip2 = byte(data, 6);
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51 local ip3 = byte(data, 7);
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52 local ip4 = byte(data, 8);
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53 local port = bit.band(byte(data, 9), bit.lshift(byte(data, 10), 8));
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54 module:log("debug", "Should connect to: "..ip1.."."..ip2.."."..ip3.."."..ip4..":"..port);
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55
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56 if not (ip1 == 0 and ip2 == 0 and ip3 == 0 and ip4 == 0 and port == 0) then
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57 module:log("debug", "The SOCKS5 proxy tells us to connect to a different IP, don't know how. :(");
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58 session:close(false);
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59 return;
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60 end
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61
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62 -- Now the real s2s listener can take over the connection.
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63 local listener = portmanager.get_service("s2s").listener;
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64
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65 module:log("debug", "SOCKS5 done, handing over listening to "..tostring(listener));
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66
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67 session.socks5_handler = nil;
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68 session.socks5_buffer = nil;
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69
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70 local w, log = conn.send, session.log;
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71
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72 local filter = initialize_filters(session);
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73
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74 session.sends2s = function (t)
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75 log("debug", "sending (s2s over socks5): %s", (t.top_tag and t:top_tag()) or t:match("^[^>]*>?"));
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76 if t.name then
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77 t = filter("stanzas/out", t);
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78 end
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79 if t then
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80 t = filter("bytes/out", tostring(t));
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81 if t then
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82 return w(conn, tostring(t));
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83 end
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84 end
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85 end
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86
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87 session.open_stream = function ()
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88 session.sends2s(st.stanza("stream:stream", {
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89 xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback',
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90 ["xmlns:stream"]='http://etherx.jabber.org/streams',
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91 from=session.from_host, to=session.to_host, version='1.0', ["xml:lang"]='en'}):top_tag());
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92 end
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93
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94 conn.setlistener(conn, listener);
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95
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96 listener.register_outgoing(conn, session);
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97
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98 listener.onconnect(conn);
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99 end
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100 end
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101
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102 local function socks5_handshake_sent(conn, data)
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103
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104 local session = sessions[conn];
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105
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106 if #data < 2 then
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107 session.socks5_buffer = data;
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108 return;
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109 end
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110
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111 -- version, method
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112 local request_status = byte(data, 2);
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113
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114 module:log("debug", "SOCKS version: "..byte(data, 1));
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115 module:log("debug", "Response: "..request_status);
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116
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117 if not request_status == 0x00 then
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118 module:log("debug", "Failed to connect to the SOCKS5 proxy. :( It seems to require authentication.");
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119 session:close(false);
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120 return;
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121 end
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122
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123 module:log("debug", "Sending connect message.");
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124
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125 -- version 5, connect, (reserved), type: domainname, (length, hostname), port
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126 conn:send(c(5) .. c(1) .. c(0) .. c(3) .. c(#session.socks5_to) .. session.socks5_to);
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127 conn:send(c(bit.rshift(session.socks5_port, 8)) .. c(bit.band(session.socks5_port, 0xff)));
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128
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129 session.socks5_handler = socks5_connect_sent;
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130 end
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131
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132 function socks5listener.onconnect(conn)
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133 module:log("debug", "Connected to SOCKS5 proxy, sending SOCKS5 handshake.");
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134
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135 -- Socks version 5, 1 method, no auth
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136 conn:send(c(5) .. c(1) .. c(0));
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137
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138 sessions[conn].socks5_handler = socks5_handshake_sent;
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139 end
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140
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141 function socks5listener.register_outgoing(conn, session)
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142 session.direction = "outgoing";
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143 sessions[conn] = session;
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144 end
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145
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diff changeset
146 function socks5listener.ondisconnect(conn, err)
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147 sessions[conn] = nil;
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148 end
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149
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diff changeset
150 function socks5listener.onincoming(conn, data)
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151 local session = sessions[conn];
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152
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153 if session.socks5_buffer then
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154 data = session.socks5_buffer .. data;
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155 end
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156
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diff changeset
157 if session.socks5_handler then
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diff changeset
158 session.socks5_handler(conn, data);
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159 end
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160 end
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161
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diff changeset
162 local function connect_socks5(host_session, connect_host, connect_port)
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163
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164 local conn, handler = socket.tcp();
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165
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166 module:log("debug", "Connecting to " .. connect_host .. ":" .. connect_port);
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167
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168 -- this is not necessarily the same as .to_host (it can be that this is a SRV record)
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diff changeset
169 host_session.socks5_to = connect_host;
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diff changeset
170 host_session.socks5_port = connect_port;
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171
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172 conn:settimeout(0);
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173
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diff changeset
174 local success, err = conn:connect(proxy_ip, proxy_port);
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175
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176 conn = wrapclient(conn, connect_host, connect_port, socks5listener, "*a");
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177
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diff changeset
178 socks5listener.register_outgoing(conn, host_session);
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179
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180 host_session.conn = conn;
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181 end
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182
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diff changeset
183 local function bounce_sendq(session, reason)
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184 local sendq = session.sendq;
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185 if not sendq then return; end
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parents:
diff changeset
186 session.log("info", "sending error replies for "..#sendq.." queued stanzas because of failed outgoing connection to "..tostring(session.to_host));
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diff changeset
187 local dummy = {
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188 type = "s2sin";
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diff changeset
189 send = function(s)
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diff changeset
190 (session.log or log)("error", "Replying to to an s2s error reply, please report this! Traceback: %s", traceback());
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191 end;
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192 dummy = true;
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193 };
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diff changeset
194 for i, data in ipairs(sendq) do
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diff changeset
195 local reply = data[2];
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196 if reply and not(reply.attr.xmlns) then
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diff changeset
197 reply.attr.type = "error";
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198 reply:tag("error", {type = "cancel"})
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199 :tag("remote-server-not-found", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up();
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diff changeset
200 if reason then
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diff changeset
201 reply:tag("text", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"})
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202 :text("Server-to-server connection failed: "..reason):up();
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203 end
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Thijs Alkemade <me@thijsalkema.de>
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diff changeset
204 core_process_stanza(dummy, reply);
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205 end
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Thijs Alkemade <me@thijsalkema.de>
parents:
diff changeset
206 sendq[i] = nil;
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207 end
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Thijs Alkemade <me@thijsalkema.de>
parents:
diff changeset
208 session.sendq = nil;
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209 end
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210
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211 -- Try to intercept anything to *.onion
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212 local function route_to_onion(event)
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213
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214 if not event.to_host:find(".onion(.?)$") then
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215 if forbid_else then
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216 module:log("debug", event.to_host .. " is not an onion. Blocking it.");
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217 return false;
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218 else
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219 return;
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220 end
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221 end
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222
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223 module:log("debug", "Onion routing something to ".. event.to_host);
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224
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225 if hosts[event.from_host].s2sout[event.to_host] then
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226 return;
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227 end
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228
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229 local host_session = s2s_new_outgoing(event.from_host, event.to_host);
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230
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231 host_session.bounce_sendq = bounce_sendq;
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232 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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233
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234 hosts[event.from_host].s2sout[event.to_host] = host_session;
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235
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236 connect_socks5(host_session, event.to_host, 5269);
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237
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238 return true;
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239 end
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240
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241 module:log("debug", "Onions ready and loaded");
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242
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243 hosts[module.host].events.add_handler("route/remote", route_to_onion, 200);