python 写一个端口转发的代码

以下是一个简单的 Python 端口转发代码示例：

import socket

def forward(source, dest):
    while True:
        data = source.recv(1024)
        if not data:
            break
        dest.sendall(data)

def main():
    local_host = '127.0.0.1'
    local_port = 8080
    remote_host = 'example.com'
    remote_port = 80

    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as local_sock:
        local_sock.bind((local_host, local_port))
        local_sock.listen(1)
        print(f'Listening on {local_host}:{local_port}')

        while True:
            with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as remote_sock:
                remote_sock.connect((remote_host, remote_port))

                source, addr = local_sock.accept()
                print(f'Accepted connection from {addr[0]}:{addr[1]}')

                forward_thread = threading.Thread(target=forward, args=(source, remote_sock))
                forward_thread.start()

if __name__ == '__main__':
    main()

此代码将本地主机的 8080 端口的所有流量转发到远程主机的 80 端口。使用 `socket` 模块创建两个套接字，一个监听本地端口，另一个连接远程主机。然后，它在两个套接字之间建立一个转发线程，将所有来自本地套接字的数据发送到远程套接字。