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plugins/proxy65.lua

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plugins/proxy65.lua @ 490:6b2f31da9610

Update for new Prosody module namespace
author Kim Alvefur <zash@zash.se>
date Sat, 20 May 2023 20:48:03 +0200
parent 457:73d4eb93657b
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1 local verse = require "verse";
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2 local new_id = require "prosody.util.id".short;
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3 local sha1 = require "prosody.util.hashes".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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12 function verse.plugins.proxy65(stream)
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13 stream.proxy65 = setmetatable({ stream = stream }, proxy65_mt);
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14 stream.proxy65.available_streamhosts = {};
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15 local outstanding_proxies = 0;
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16 stream:hook("disco/service-discovered/proxy", function (service)
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17 -- Fill list with available proxies
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18 if service.type == "bytestreams" then
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19 outstanding_proxies = outstanding_proxies + 1;
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20 stream:send_iq(verse.iq({ to = service.jid, type = "get" })
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21 :tag("query", { xmlns = xmlns_bytestreams }), function (result)
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22
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23 outstanding_proxies = outstanding_proxies - 1;
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24 if result.attr.type == "result" then
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25 local streamhost = result:get_child("query", xmlns_bytestreams)
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26 :get_child("streamhost").attr;
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28 stream.proxy65.available_streamhosts[streamhost.jid] = {
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29 jid = streamhost.jid;
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30 host = streamhost.host;
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31 port = tonumber(streamhost.port);
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32 };
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33 end
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34 if outstanding_proxies == 0 then
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35 stream:event("proxy65/discovered-proxies", stream.proxy65.available_streamhosts);
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36 end
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37 end);
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38 end
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39 end);
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40 stream:hook("iq/"..xmlns_bytestreams, function (request)
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41 local conn = verse.new(nil, {
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42 initiator_jid = request.attr.from,
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43 streamhosts = {},
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44 current_host = 0;
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45 });
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46
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47 -- Parse hosts from request
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48 for tag in request.tags[1]:childtags() do
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49 if tag.name == "streamhost" then
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50 table.insert(conn.streamhosts, tag.attr);
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51 end
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52 end
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53
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54 --Attempt to connect to the next host
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55 local function attempt_next_streamhost()
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56 -- First connect, or the last connect failed
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57 if conn.current_host < #conn.streamhosts then
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58 conn.current_host = conn.current_host + 1;
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59 conn:connect(
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60 conn.streamhosts[conn.current_host].host,
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61 conn.streamhosts[conn.current_host].port
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62 );
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63 negotiate_socks5(stream, conn, request.tags[1].attr.sid, request.attr.from, stream.jid);
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64 return true; -- Halt processing of disconnected event
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65 end
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66 -- All streamhosts tried, none successful
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67 conn:unhook("disconnected", attempt_next_streamhost);
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68 stream:send(verse.error_reply(request, "cancel", "item-not-found"));
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69 -- Let disconnected event fall through to user handlers...
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70 end
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71
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72 function conn:accept()
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73 conn:hook("disconnected", attempt_next_streamhost, 100);
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74 -- When this event fires, we're connected to a streamhost
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75 conn:hook("connected", function ()
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76 conn:unhook("disconnected", attempt_next_streamhost);
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77 -- Send XMPP success notification
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78 local reply = verse.reply(request)
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79 :tag("query", request.tags[1].attr)
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80 :tag("streamhost-used", { jid = conn.streamhosts[conn.current_host].jid });
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81 stream:send(reply);
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82 end, 100);
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83 attempt_next_streamhost();
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84 end
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85 function conn:refuse()
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86 -- FIXME: XMPP refused reply
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87 end
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88 stream:event("proxy65/request", conn);
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89 end);
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90 end
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91
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92 function proxy65_mt:new(target_jid, proxies)
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93 local conn = verse.new(nil, {
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94 target_jid = target_jid;
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95 bytestream_sid = new_id();
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96 });
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97
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98 local request = verse.iq{type="set", to = target_jid}
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99 :tag("query", { xmlns = xmlns_bytestreams, mode = "tcp", sid = conn.bytestream_sid });
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100 for _, proxy in ipairs(proxies or self.proxies) do
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101 request:tag("streamhost", proxy):up();
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102 end
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104
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105 self.stream:send_iq(request, function (reply)
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106 if reply.attr.type == "error" then
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107 local type, condition, text = reply:get_error();
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108 conn:event("connection-failed", { conn = conn, type = type, condition = condition, text = text });
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109 else
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110 -- Target connected to streamhost, connect ourselves
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111 local streamhost_used = reply.tags[1]:get_child("streamhost-used");
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112 -- if not streamhost_used then
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113 --FIXME: Emit error
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114 -- end
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115 conn.streamhost_jid = streamhost_used.attr.jid;
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116 local host, port;
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117 for _, proxy in ipairs(proxies or self.proxies) do
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118 if proxy.jid == conn.streamhost_jid then
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119 host, port = proxy.host, proxy.port;
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120 break;
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121 end
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122 end
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123 -- if not (host and port) then
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124 --FIXME: Emit error
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125 -- end
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126
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127 conn:connect(host, port);
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128
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129 local function handle_proxy_connected()
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130 conn:unhook("connected", handle_proxy_connected);
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131 -- Both of us connected, tell proxy to activate connection
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132 local activate_request = verse.iq{to = conn.streamhost_jid, type="set"}
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133 :tag("query", { xmlns = xmlns_bytestreams, sid = conn.bytestream_sid })
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134 :tag("activate"):text(target_jid);
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135 self.stream:send_iq(activate_request, function (activated)
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136 if activated.attr.type == "result" then
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137 -- Connection activated, ready to use
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138 conn:event("connected", conn);
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139 -- else --FIXME: Emit error
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140 end
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141 end);
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142 return true;
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143 end
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144 conn:hook("connected", handle_proxy_connected, 100);
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145
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146 negotiate_socks5(self.stream, conn, conn.bytestream_sid, self.stream.jid, target_jid);
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147 end
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148 end);
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149 return conn;
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150 end
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151
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152 function negotiate_socks5(stream, conn, sid, requester_jid, target_jid)
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153 local hash = sha1(sid..requester_jid..target_jid);
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154 local function suppress_connected()
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155 conn:unhook("connected", suppress_connected);
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156 return true;
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157 end
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158 local function receive_connection_response(data)
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159 conn:unhook("incoming-raw", receive_connection_response);
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160
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161 if data:sub(1, 2) ~= "\005\000" then
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162 return conn:event("error", "connection-failure");
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163 end
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164 conn:event("connected");
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165 return true;
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166 end
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167 local function receive_auth_response(data)
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168 conn:unhook("incoming-raw", receive_auth_response);
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169 if data ~= "\005\000" then -- SOCKSv5; "NO AUTHENTICATION"
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170 -- Server is not SOCKSv5, or does not allow no auth
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171 local err = "version-mismatch";
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172 if data:sub(1,1) == "\005" then
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173 err = "authentication-failure";
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174 end
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175 return conn:event("error", err);
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176 end
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177 -- Request SOCKS5 connection
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178 conn:send(string.char(0x05, 0x01, 0x00, 0x03, #hash)..hash.."\0\0"); --FIXME: Move to "connected"?
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179 conn:hook("incoming-raw", receive_connection_response, 100);
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180 return true;
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181 end
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182 conn:hook("connected", suppress_connected, 200);
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183 conn:hook("incoming-raw", receive_auth_response, 100);
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184 conn:send("\005\001\000"); -- SOCKSv5; 1 mechanism; "NO AUTHENTICATION"
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185 end