verse
014bdb4154e9
plugins/proxy65.lua

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plugins/proxy65.lua @ 56:014bdb4154e9

verse.plugins.proxy65: XEP-0065 plugin for file transfer through a proxy
author Matthew Wild <mwild1@gmail.com>
date Thu, 06 May 2010 10:34:27 +0100
child 103:6cc0ca4aa664
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
56
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1 local events = require "util.events";
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2 local uuid = require "util.uuid";
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3 local sha1 = require "util.sha1";
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4
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5 local proxy65_mt = {};
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6 proxy65_mt.__index = proxy65_mt;
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7
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8 local xmlns_bytestreams = "http://jabber.org/protocol/bytestreams";
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9
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10 local negotiate_socks5;
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11
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12 function verse.plugins.proxy65(stream)
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13 stream.proxy65 = setmetatable({ stream = stream }, proxy65_mt);
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14 stream:hook("disco-result", function (result)
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15 -- Fill list with available proxies
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16 end);
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17 stream:hook("iq/"..xmlns_bytestreams, function (request)
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18 local conn = verse.new(nil, {
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19 initiator_jid = request.attr.from,
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20 streamhosts = {},
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21 current_host = 0;
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22 });
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23
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24 -- Parse hosts from request
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25 for tag in request.tags[1]:childtags() do
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26 if tag.name == "streamhost" then
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27 table.insert(conn.streamhosts, tag.attr);
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28 end
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29 end
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30
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31 --Attempt to connect to the next host
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32 local function attempt_next_streamhost()
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33 -- First connect, or the last connect failed
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34 if conn.current_host < #conn.streamhosts then
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35 conn.current_host = conn.current_host + 1;
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36 conn:connect(
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37 conn.streamhosts[conn.current_host].host,
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38 conn.streamhosts[conn.current_host].port
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39 );
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40 negotiate_socks5(stream, conn, request.tags[1].attr.sid, request.attr.from, stream.jid);
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41 return true; -- Halt processing of disconnected event
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42 end
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43 -- All streamhosts tried, none successful
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44 conn:unhook("disconnected", attempt_next_streamhost);
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45 stream:send(verse.error_reply(request, "cancel", "item-not-found"));
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46 -- Let disconnected event fall through to user handlers...
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47 end
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48
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49 function conn:accept()
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50 conn:hook("disconnected", attempt_next_streamhost, 100);
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51 -- When this event fires, we're connected to a streamhost
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52 conn:hook("connected", function ()
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53 conn:unhook("disconnected", attempt_next_streamhost);
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54 -- Send XMPP success notification
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55 local reply = verse.reply(request)
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56 :tag("query", request.tags[1].attr)
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57 :tag("streamhost-used", { jid = conn.streamhosts[conn.current_host].jid });
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58 stream:send(reply);
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59 end, 100);
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60 attempt_next_streamhost();
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61 end
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62 function conn:refuse()
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63 -- FIXME: XMPP refused reply
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64 end
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65 stream:event("proxy65/request", conn);
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66 end);
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67 end
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68
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69 function proxy65_mt:new(target_jid, proxies)
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70 local conn = verse.new(nil, {
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71 target_jid = target_jid;
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72 bytestream_sid = uuid.generate();
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73 });
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74
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75 local request = verse.iq{type="set", to = target_jid}
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76 :tag("query", { xmlns = xmlns_bytestreams, mode = "tcp", sid = conn.bytestream_sid });
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77 for _, proxy in ipairs(proxies or self.proxies) do
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78 request:tag("streamhost", proxy):up();
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79 end
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80
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81
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82 self.stream:send_iq(request, function (reply)
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83 if reply.attr.type == "error" then
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84 local type, condition, text = reply:get_error();
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85 conn:event("connection-failed", { conn = conn, type = type, condition = condition, text = text });
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86 else
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87 -- Target connected to streamhost, connect ourselves
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88 local streamhost_used = reply.tags[1]:get_child("streamhost-used");
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89 if not streamhost_used then
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90 --FIXME: Emit error
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91 end
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92 conn.streamhost_jid = streamhost_used.attr.jid;
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93 local host, port;
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94 for _, proxy in ipairs(proxies or self.proxies) do
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95 if proxy.jid == conn.streamhost_jid then
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96 host, port = proxy.host, proxy.port;
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97 break;
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98 end
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99 end
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100 if not (host and port) then
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101 --FIXME: Emit error
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102 end
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103
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104 conn:connect(host, port);
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105
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106 local function handle_proxy_connected()
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107 conn:unhook("connected", handle_proxy_connected);
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108 -- Both of us connected, tell proxy to activate connection
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109 local request = verse.iq{to = conn.streamhost_jid, type="set"}
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110 :tag("query", { xmlns = xmlns_bytestreams, sid = conn.bytestream_sid })
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111 :tag("activate"):text(target_jid);
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112 self.stream:send_iq(request, function (reply)
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113 if reply.attr.type == "result" then
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114 -- Connection activated, ready to use
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115 conn:event("connected", conn);
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116 else
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117 --FIXME: Emit error
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118 end
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119 end);
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120 return true;
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121 end
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122 conn:hook("connected", handle_proxy_connected, 100);
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123
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124 negotiate_socks5(self.stream, conn, conn.bytestream_sid, self.stream.jid, target_jid);
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125 end
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126 end);
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127 return conn;
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128 end
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129
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130 function negotiate_socks5(stream, conn, sid, requester_jid, target_jid)
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131 local hash = sha1.sha1(sid..requester_jid..target_jid);
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132 local function suppress_connected()
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133 conn:unhook("connected", suppress_connected);
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134 return true;
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135 end
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136 local function receive_connection_response(data)
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137 conn:unhook("incoming-raw", receive_connection_response);
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138
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139 if data:sub(1, 2) ~= "\005\000" then
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140 return conn:event("error", "connection-failure");
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141 end
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142 conn:event("connected");
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143 return true;
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144 end
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145 local function receive_auth_response(data)
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146 conn:unhook("incoming-raw", receive_auth_response);
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147 if data ~= "\005\000" then -- SOCKSv5; "NO AUTHENTICATION"
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148 -- Server is not SOCKSv5, or does not allow no auth
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149 local err = "version-mismatch";
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150 if data:sub(1,1) == "\005" then
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151 err = "authentication-failure";
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152 end
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153 return conn:event("error", err);
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154 end
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155 -- Request SOCKS5 connection
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156 conn:send(string.char(0x05, 0x01, 0x00, 0x03, #hash)..hash.."\0\0"); --FIXME: Move to "connected"?
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157 conn:hook("incoming-raw", receive_connection_response, 100);
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158 return true;
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159 end
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160 conn:hook("connected", suppress_connected, 200);
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161 conn:hook("incoming-raw", receive_auth_response, 100);
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162 conn:send("\005\001\000"); -- SOCKSv5; 1 mechanism; "NO AUTHENTICATION"
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163 end