帮我用Python写一个netcat

Sure, here is a simple Python code for netcat:

import socket

def netcat(hostname, port, content):
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect((hostname, port))
    s.sendall(content.encode())
    s.shutdown(socket.SHUT_WR)
    while True:
        data = s.recv(1024)
        if not data:
            break
        print(repr(data))
    print("Connection closed.")

netcat("example.com", 80, "GET / HTTP/1.1\r\nHost: example.com\r\n\r\n")

This code creates a socket and connects to a specified hostname and port. It then sends a message (in this case, an HTTP GET request) and waits for a response. Once the response is received, it prints it to the console.

相关问题

python netcat

Python Netcat是通过Python实现的Netcat工具。Netcat是一种通用的网络工具，它可以实现TCP/UDP连接的建立，文件传输以及端口扫描等功能。利用Python实现Netcat可以方便地进行网络通信和测试。一个常见的用法是使用Python脚本实现一个简单的Netcat功能，通过Socket对象监听本地端口，并将接收到的数据回传给客户端，同时通过Socket对象连接本地端口，并发送数据给服务端。具体的代码可以参考引用中提供的示例代码来实现。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* *3* [用Python编写网络工具——简单版Netcat](https://blog.csdn.net/qq_39605374/article/details/131137067)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v92^chatsearchT3_1"}}] [.reference_item style="max-width: 50%"]
- *2* [[超细划重点]攻击服务器没有netcat如何使用python替代（取代netcat）](https://blog.csdn.net/qq_64201116/article/details/125510696)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v92^chatsearchT3_1"}}] [.reference_item style="max-width: 50%"]
[ .reference_list ]

使用python实现netcat

以下是Python实现Netcat的样例代码：

import argparse
import socket
import threading
import subprocess

def send_recv(sock):
    while True:
        data = sock.recv(1024)
        if not data:
            break
        sock.sendall(data)
        print(data.decode())

def listen(port):
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.bind(('0.0.0.0', port))
    sock.listen(1)
    conn, addr = sock.accept()
    print(f'Connected by {addr}')
    send_recv(conn)
    conn.close()

def connect(host, port):
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.connect((host, port))
    send_recv(sock)
    sock.close()

def execute(cmd):
    result = subprocess.check_output(cmd, shell=True)
    return result

def main():
    parser = argparse.ArgumentParser(description='Netcat')
    parser.add_argument('-l', '--listen', action='store_true', help='listen mode')
    parser.add_argument('-c', '--connect', metavar='HOST', help='connect mode')
    parser.add_argument('-p', '--port', type=int, default=8888, help='port')
    parser.add_argument('-e', '--execute', metavar='CMD', help='execute command')
    args = parser.parse_args()

    if args.listen:
        listen(args.port)
    elif args.connect:
        connect(args.connect, args.port)
    elif args.execute:
        result = execute(args.execute)
        print(result.decode())

if __name__ == '__main__':
    main()

使用方法：

- 监听模式：`python netcat.py -l -p 8888`
- 连接模式：`python netcat.py -c 127.0.0.1 -p 8888`
- 执行命令：`python netcat.py -e "ls -la"`