ftp服务器源程序_FTP

FTP（File Transfer Protocol）服务器源程序主要包括以下几个部分：

1、创建套接字并绑定到指定端口

2、监听客户端连接请求

3、接受客户端连接并处理请求

4、实现FTP命令的处理逻辑

5、关闭连接

以下是一个简单的Python实现的FTP服务器源程序：

import socket
import os
from threading import Thread
class FTPServer:
    def __init__(self, host='localhost', port=21):
        self.host = host
        self.port = port
        self.server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.server_socket.bind((self.host, self.port))
        self.server_socket.listen(5)
        print(f"FTP server is listening on {self.host}:{self.port}")
    def handle_client(self, client_socket):
        while True:
            data = client_socket.recv(1024).decode('utf8')
            if not data:
                break
            print(f"Received from client: {data}")
            response = self.process_command(data)
            client_socket.send(response.encode('utf8'))
        client_socket.close()
    def process_command(self, command):
        command = command.strip().upper()
        if command == 'QUIT':
            return "221 Goodbye."
        elif command == 'HELP':
            return "214The following commands are recognized:rnUSERrnPASSrnLISTrnRETRrnSTORrnQUITrn"
        elif command.startswith('USER '):
            return "331 Please specify the password."
        elif command.startswith('PASS '):
            return "230 Login successful."
        elif command == 'LIST':
            return "150 Here comes the directory listing."
        elif command.startswith('RETR '):
            filename = command[5:]
            if os.path.isfile(filename):
                return f"150 Opening BINARY mode data connection for {filename}"
            else:
                return "550 File not found."
        elif command.startswith('STOR '):
            filename = command[5:]
            return f"150 Ok to send data."
        else:
            return "500 Syntax error, command unrecognized."
    def run(self):
        while True:
            client_socket, client_address = self.server_socket.accept()
            print(f"Accepted connection from {client_address}")
            client_thread = Thread(target=self.handle_client, args=(client_socket,))
            client_thread.start()
if __name__ == '__main__':
    server = FTPServer()
    server.run()

这个程序实现了一个简单的FTP服务器，可以接收客户端的连接请求，处理一些基本的FTP命令，如USER、PASS、LIST、RETR和STOR，这个示例仅用于演示目的，实际的FTP服务器需要实现更多的功能和安全性措施。