自主实现Telnet流量抓取

根据测试需求，需要抓取Telnet流量包，使用wireshark + Python（socket、telnetlib库）实现

实现代码

主要此处有坑， 根据协议规则，wireshark 默认端口为23 的是Telnet协议， 小编的启动服务的时候未设置23端口，因此怎么抓都回显tcp；

搭建服务端

import socket

def start_server(host, port):
    server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server.bind((host, port))
    server.listen(1)
    print(f"Server started on {host}:{port}")

    while True:
        client, addr = server.accept()
        print(f"Connected by {addr}")
        while True:
            data = client.recv(1024)
            if not data:
                break
            print(f"Received: {data.decode()}")
            client.sendall(data)
        client.close()


if __name__ == "__main__":
    HOST = 'ip'  # Server address
    PORT = 23  # Server port
    start_server(HOST, PORT)

“启动”

搭建客户端

客户端这里需要注意，编码的要求，如果你用的非UTF-8，就别写中文；

import telnetlib

def telnet_client(host, port):
    with telnetlib.Telnet(host, port) as tn:
        while True:
            message = input("Enter message: ")
            tn.write(message.encode('UTF-8') + b"\n")
            response = tn.read_until(b"\n").decode('utf-8')
            print(f"Server response: {response.strip()}")

if __name__ == "__main__":
    HOST = 'ip'  # Server address
    PORT = 23        # Server port
    telnet_client(HOST, PORT)

这里需要“启动”