Shellcode testing program
    Usage:
        shtest {-f file | $'\xeb\xfe' | '\xb8\x39\x05\x00\x00\xc3'}
    Usage example:
        $ shtest $'\xeb\xfe'                 # raw shellcode
        $ shtest '\xb8\x39\x05\x00\x00\xc3'  # escaped shellcode
        $ shtest -f test.sc                  # shellcode from file
        $ shtest -f <(python gen_payload.py) # test generated payload
        $ shtest -s 5 -f test.sc             # create socket at fd=5
            # Allows to test staged shellcodes
            # Flow is redirected like this: STDIN -> SOCKET -> STDOUT
    Compiling:
        gcc -Wall shtest.c -o shtest
    Author: hellman (hellman1908@gmail.com)