Module: Rex::Proto::Proxy::Socks4a::Client::Relay

Defined in:
lib/rex/proto/proxy/socks4a.rb

Overview

A mixin for a socket to perform a relay to another socket.

Instance Method Summary collapse

Instance Method Details

#relay(relay_client, relay_sock) ⇒ Object

Relay data coming in from relay_sock to this socket.



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# File 'lib/rex/proto/proxy/socks4a.rb', line 164

def relay( relay_client, relay_sock )
  @relay_client = relay_client
  @relay_sock   = relay_sock
  # start the relay thread (modified from Rex::IO::StreamAbstraction)
  @relay_thread = Rex::ThreadFactory.spawn("SOCKS4AProxyServerRelay", false) do
    loop do
      closed = false
      buf    = nil

      begin
        s = Rex::ThreadSafe.select( [ @relay_sock ], nil, nil, 0.2 )
        if( s == nil || s[0] == nil )
          next
        end
      rescue
        closed = true
      end

      if( closed == false )
        begin
          buf = @relay_sock.sysread( 32768 )
          closed = true if( buf == nil )
        rescue
          closed = true
        end
      end

      if( closed == false )
        total_sent   = 0
        total_length = buf.length
        while( total_sent < total_length )
          begin
            data = buf[total_sent, buf.length]
            sent = self.write( data )
            if( sent > 0 )
              total_sent += sent
            end
          rescue
            closed = true
            break
          end
        end
      end

      if( closed )
        @relay_client.stop
        ::Thread.exit
      end
    end
  end

end