[Seccon Beginners 2018][MISC] てけいさんえくすとりーむず

대충 번역기 돌려보면 뭔소린지 모르겠다.

nc 접속해보면 사칙연산 100스테이지 깨는거같아서 코드를 짰다.

from socket import *
 
HOST = 'tekeisan-ekusutoriim.chall.beginners.seccon.jp'
PORT = 8690
 
s = socket(AF_INET, SOCK_STREAM)
s.connect((HOST,PORT))
 
def read_until(check):
   buffer = ''
   while check not in buffer:
      buffer += s.recv(1)
   return buffer
 
read_until('---------------------------------------------------------------')
read_until('---------------------------------------------------------------\n')
 
for i in range(1,101):
    read_until('(Stage.' + str(i) + ')\n')
    data = s.recv(1024).strip().replace('=', '')
    print data
    print eval(data)
    s.send(str(eval(data)) + '\n')
 
print s.recv(1024)