85 lines
1.7 KiB
Ruby
85 lines
1.7 KiB
Ruby
#!/usr/bin/ruby
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# This file is part of Metasm, the Ruby assembly manipulation suite
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# Copyright (C) 2009 Yoann GUILLOT
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#
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# Licence is LGPL, see LICENCE in the top-level directory
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# this is a TCP proxy which dumps the transmitted data in hex on stdout
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# usage: tcp_proxy <lhost> <lport> <rhost> <rport> [<timeout_s>]
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require 'socket'
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require File.join(File.dirname(__FILE__), 'hexdump')
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def bouncepkt(clt, srv, timeout=nil)
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s2c = ''
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c2s = ''
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loop do
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break if not IO.select([clt, srv], nil, nil, timeout)
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while srv and s2c.length < 1024*16 and IO.select([srv], nil, nil, 0)
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str = (srv.read(1) rescue nil)
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if not str or str.empty?
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srv = false
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else
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s2c << str
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end
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end
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while clt and c2s.length < 1024*16 and IO.select([clt], nil, nil, 0)
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str = (clt.read(1) rescue nil)
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if not str or str.empty?
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clt = false
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else
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c2s << str
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end
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end
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if clt and s2c.length > 0 and IO.select(nil, [clt], nil, 0)
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puts Time.now.strftime('s -> c %H:%M:%S')
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s2c.hexdump(['c', 'a'])
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clt.write s2c
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s2c.replace ''
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end
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if srv and c2s.length > 0 and IO.select(nil, [srv], nil, 0)
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puts Time.now.strftime('c -> s %H:%M:%S')
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c2s.hexdump(['c', 'a'])
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srv.write c2s
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c2s.replace ''
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end
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break if not clt or not srv
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end
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end
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if $0 == __FILE__
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if ARGV.length < 4
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abort "usage: bnc <lhost> <lport> <rhost> <rport> [<timeout_s>]"
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end
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lhost = ARGV.shift
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lport = Integer(ARGV.shift)
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rhost = ARGV.shift
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rport = Integer(ARGV.shift)
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timeout = Float(ARGV.shift) if not ARGV.empty?
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s = TCPServer.new(lhost, lport)
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loop do
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puts "waiting..."
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a = s.accept
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puts "incoming connection"
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c = TCPSocket.new(rhost, rport)
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begin
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bouncepkt(a, c, timeout)
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rescue SystemCallError
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end
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puts "connection closed"
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a.close
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c.close
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end
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end
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