Mercurial > prosody-modules

annotate mod_onions/mod_onions.lua @ 1780:b3e3ad35391a

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mod_onions: Small fixes making bounce_sendq match mod_s2s again.
author Thijs Alkemade <me@thijsalkema.de>
date Thu, 13 Aug 2015 18:20:33 +0200
parents e0d8caffa209
children 12ac88940fe3
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rev   line source
1780
b3e3ad35391a mod_onions: Small fixes making bounce_sendq match mod_s2s again.
Thijs Alkemade <me@thijsalkema.de>
parents: 1617
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1 local prosody = prosody;
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2 local core_process_stanza = prosody.core_process_stanza;
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3
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4 local wrapclient = require "net.server".wrapclient;
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5 local s2s_new_outgoing = require "core.s2smanager".new_outgoing;
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6 local initialize_filters = require "util.filters".initialize;
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7 local st = require "util.stanza";
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9 local portmanager = require "core.portmanager";
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10
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11 local softreq = require "util.dependencies".softreq;
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12
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13 local bit;
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14 pcall(function() bit = require"bit"; end);
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15 bit = bit or softreq"bit32"
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16 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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17
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18 local band = bit.band;
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19 local rshift = bit.rshift;
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20 local lshift = bit.lshift;
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21
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22 local byte = string.byte;
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23 local c = string.char;
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25 module:depends("s2s");
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27 local proxy_ip = module:get_option("onions_socks5_host") or "127.0.0.1";
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28 local proxy_port = module:get_option("onions_socks5_port") or 9050;
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29 local forbid_else = module:get_option("onions_only") or false;
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30 local torify_all = module:get_option("onions_tor_all") or false;
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32 local sessions = module:shared("sessions");
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34 -- The socks5listener handles connection while still connecting to the proxy,
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35 -- then it hands them over to the normal listener (in mod_s2s)
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36 local socks5listener = { default_port = proxy_port, default_mode = "*a", default_interface = "*" };
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38 local function socks5_connect_sent(conn, data)
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40 local session = sessions[conn];
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42 if #data < 5 then
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43 session.socks5_buffer = data;
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44 return;
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45 end
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46
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47 request_status = byte(data, 2);
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48
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49 if not request_status == 0x00 then
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50 module:log("debug", "Failed to connect to the SOCKS5 proxy. :(");
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51 session:close(false);
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52 return;
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53 end
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54
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55 module:log("debug", "Succesfully connected to SOCKS5 proxy.");
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57 local response = byte(data, 4);
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58
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59 if response == 0x01 then
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60 if #data < 10 then
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61 -- let's try again when we have enough
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62 session.socks5_buffer = data;
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63 return;
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64 end
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65
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66 -- this means the server tells us to connect on an IPv4 address
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67 local ip1 = byte(data, 5);
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68 local ip2 = byte(data, 6);
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69 local ip3 = byte(data, 7);
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70 local ip4 = byte(data, 8);
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71 local port = band(byte(data, 9), lshift(byte(data, 10), 8));
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72 module:log("debug", "Should connect to: "..ip1.."."..ip2.."."..ip3.."."..ip4..":"..port);
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73
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74 if not (ip1 == 0 and ip2 == 0 and ip3 == 0 and ip4 == 0 and port == 0) then
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75 module:log("debug", "The SOCKS5 proxy tells us to connect to a different IP, don't know how. :(");
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76 session:close(false);
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77 return;
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78 end
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79
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80 -- Now the real s2s listener can take over the connection.
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81 local listener = portmanager.get_service("s2s").listener;
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82
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83 module:log("debug", "SOCKS5 done, handing over listening to "..tostring(listener));
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84
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85 session.socks5_handler = nil;
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86 session.socks5_buffer = nil;
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87
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88 local w, log = conn.send, session.log;
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89
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90 local filter = initialize_filters(session);
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91
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92 session.version = 1;
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93
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94 session.sends2s = function (t)
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95 log("debug", "sending (s2s over socks5): %s", (t.top_tag and t:top_tag()) or t:match("^[^>]*>?"));
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96 if t.name then
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97 t = filter("stanzas/out", t);
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98 end
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99 if t then
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100 t = filter("bytes/out", tostring(t));
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101 if t then
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102 return conn:write(tostring(t));
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103 end
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104 end
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parents:
diff changeset
105 end
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106
1060
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diff changeset
107 session.open_stream = function ()
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diff changeset
108 session.sends2s(st.stanza("stream:stream", {
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diff changeset
109 xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback',
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diff changeset
110 ["xmlns:stream"]='http://etherx.jabber.org/streams',
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diff changeset
111 from=session.from_host, to=session.to_host, version='1.0', ["xml:lang"]='en'}):top_tag());
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112 end
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113
1060
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diff changeset
114 conn.setlistener(conn, listener);
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115
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116 listener.register_outgoing(conn, session);
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117
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118 listener.onconnect(conn);
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119 end
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120 end
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121
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122 local function socks5_handshake_sent(conn, data)
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123
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124 local session = sessions[conn];
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125
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126 if #data < 2 then
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127 session.socks5_buffer = data;
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128 return;
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129 end
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130
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131 -- version, method
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132 local request_status = byte(data, 2);
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133
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134 module:log("debug", "SOCKS version: "..byte(data, 1));
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135 module:log("debug", "Response: "..request_status);
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136
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137 if not request_status == 0x00 then
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138 module:log("debug", "Failed to connect to the SOCKS5 proxy. :( It seems to require authentication.");
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139 session:close(false);
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140 return;
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141 end
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142
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143 module:log("debug", "Sending connect message.");
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144
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145 -- version 5, connect, (reserved), type: domainname, (length, hostname), port
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146 conn:write(c(5) .. c(1) .. c(0) .. c(3) .. c(#session.socks5_to) .. session.socks5_to);
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147 conn:write(c(rshift(session.socks5_port, 8)) .. c(band(session.socks5_port, 0xff)));
1060
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148
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149 session.socks5_handler = socks5_connect_sent;
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150 end
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151
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152 function socks5listener.onconnect(conn)
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153 module:log("debug", "Connected to SOCKS5 proxy, sending SOCKS5 handshake.");
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154
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155 -- Socks version 5, 1 method, no auth
1299
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Thijs Alkemade <me@thijsalkema.de>
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156 conn:write(c(5) .. c(1) .. c(0));
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157
1060
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158 sessions[conn].socks5_handler = socks5_handshake_sent;
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159 end
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160
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diff changeset
161 function socks5listener.register_outgoing(conn, session)
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162 session.direction = "outgoing";
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163 sessions[conn] = session;
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164 end
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165
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166 function socks5listener.ondisconnect(conn, err)
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167 sessions[conn] = nil;
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168 end
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169
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diff changeset
170 function socks5listener.onincoming(conn, data)
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171 local session = sessions[conn];
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172
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173 if session.socks5_buffer then
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174 data = session.socks5_buffer .. data;
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175 end
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176
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177 if session.socks5_handler then
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178 session.socks5_handler(conn, data);
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179 end
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180 end
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181
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182 local function connect_socks5(host_session, connect_host, connect_port)
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183
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184 local conn, handler = socket.tcp();
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185
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186 module:log("debug", "Connecting to " .. connect_host .. ":" .. connect_port);
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187
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188 -- this is not necessarily the same as .to_host (it can be that this is a SRV record)
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189 host_session.socks5_to = connect_host;
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190 host_session.socks5_port = connect_port;
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191
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192 conn:settimeout(0);
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193
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diff changeset
194 local success, err = conn:connect(proxy_ip, proxy_port);
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195
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196 conn = wrapclient(conn, connect_host, connect_port, socks5listener, "*a");
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197
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diff changeset
198 socks5listener.register_outgoing(conn, host_session);
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199
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200 host_session.conn = conn;
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201 end
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202
1780
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diff changeset
203 local bouncy_stanzas = { message = true, presence = true, iq = true };
1060
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204 local function bounce_sendq(session, reason)
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205 local sendq = session.sendq;
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206 if not sendq then return; end
1780
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diff changeset
207 session.log("info", "Sending error replies for "..#sendq.." queued stanzas because of failed outgoing connection to "..tostring(session.to_host));
1060
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208 local dummy = {
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209 type = "s2sin";
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210 send = function(s)
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211 (session.log or log)("error", "Replying to to an s2s error reply, please report this! Traceback: %s", traceback());
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212 end;
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213 dummy = true;
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214 };
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215 for i, data in ipairs(sendq) do
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216 local reply = data[2];
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217 if reply and not(reply.attr.xmlns) and bouncy_stanzas[reply.name] then
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218 reply.attr.type = "error";
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219 reply:tag("error", {type = "cancel"})
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220 :tag("remote-server-not-found", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"}):up();
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221 if reason then
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222 reply:tag("text", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"})
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223 :text("Server-to-server connection failed: "..reason):up();
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224 end
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225 core_process_stanza(dummy, reply);
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226 end
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227 sendq[i] = nil;
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228 end
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229 session.sendq = nil;
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230 end
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231 -- Try to intercept anything to *.onion
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232 local function route_to_onion(event)
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233 local stanza = event.stanza;
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234
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235 if not event.to_host:find(".onion(.?)$") then
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236 if forbid_else then
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237 module:log("debug", event.to_host .. " is not an onion. Blocking it.");
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238 return false;
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239 elseif not torify_all then
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240 return;
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241 end
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242 end
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243
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244 module:log("debug", "Onion routing something to ".. event.to_host);
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245
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246 if hosts[event.from_host].s2sout[event.to_host] then
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247 return;
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248 end
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249
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250 local host_session = s2s_new_outgoing(event.from_host, event.to_host);
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251
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252 host_session.bounce_sendq = bounce_sendq;
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253 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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254
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255 hosts[event.from_host].s2sout[event.to_host] = host_session;
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256
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257 connect_socks5(host_session, event.to_host, 5269);
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258
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259 return true;
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260 end
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261
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262 module:log("debug", "Onions ready and loaded");
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263
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264 hosts[module.host].events.add_handler("route/remote", route_to_onion, 200);