pwntools无法收到消息

Question

当我从带有python3-pwntools's recv()，sendlineafter() ...等的可伪进程序收到消息时，什么也没收到。 如果您知道解决方法。

环境

python3-pwntools 2.2.1
python3 3.5.2
Ubuntu 16.04(vagrant:ubuntu/xenial64)

目标

#include <stdio.h>

int main() {
    char buffer[0x10];
    printf("Hello, what's your name?: ");
    fgets(buffer, 0x100, stdin);
    printf("[+] buffer ==> %s\n", buffer);
    return 0;
}

利用代码（草稿）

from pwn import *
from sys import argv

context(os='linux', arch='amd64', log_level='debug', terminal=['tmux', 'splitw', '-h'])
FILE_NAME = './ret2shellcode'
binary = ELF(FILE_NAME)
SHELLCODE = asm(shellcraft.sh())

r = process(FILE_NAME)

def main():
    payload = b'A' * 24
    payload += b'X' * 8
    payload += b'B' * 0x50
    print(r.recv())
    r.sendlineafter("Hello, what's your name?:", payload)
    print(r.recv())
if __name__ == '__main__':
    main()

结果

~~~~
[+] Starting program './ret2shellcode': Done
    # <== nothing come