帮我写一个简单的网络ftp服务器代码
时间: 2023-03-24 10:01:42 浏览: 62
好的,以下是一个简单的Python实现FTP服务器的示例代码:
```python
import socket
import os
HOST = '127.0.0.1' # FTP服务器IP地址
PORT = 21 # FTP服务器端口号
BACKLOG = 5 # 最大连接数
BUFSIZE = 1024 # 缓冲区大小
# 获取当前工作目录
def pwd():
return os.getcwd()
# 列出当前目录下的文件列表
def dir_list():
return os.listdir()
# 切换工作目录
def cwd(path):
os.chdir(path)
# 下载文件
def retr(filename):
with open(filename, 'rb') as f:
data = f.read()
return data
# 上传文件
def stor(filename, data):
with open(filename, 'wb') as f:
f.write(data)
# 处理客户端请求
def handle_request(conn):
conn.send(b'220 Welcome to FTP server.\r\n')
while True:
data = conn.recv(BUFSIZE)
if not data:
break
cmd = data.decode().strip()
if cmd == 'QUIT':
conn.send(b'221 Goodbye.\r\n')
break
elif cmd == 'PWD':
conn.send(bytes('257 "%s"\r\n' % pwd(), 'utf-8'))
elif cmd == 'LIST':
files = dir_list()
conn.send(b'150 Here comes the directory listing.\r\n')
for f in files:
conn.send(bytes(f + '\r\n', 'utf-8'))
conn.send(b'226 Directory send OK.\r\n')
elif cmd.startswith('CWD '):
path = cmd[4:]
cwd(path)
conn.send(bytes('250 Directory changed to "%s"\r\n' % path, 'utf-8'))
elif cmd.startswith('RETR '):
filename = cmd[5:]
data = retr(filename)
conn.send(b'150 Opening data connection.\r\n')
conn.send(data)
conn.send(b'226 Transfer complete.\r\n')
elif cmd.startswith('STOR '):
filename = cmd[5:]
conn.send(b'150 Opening data connection.\r\n')
data = conn.recv(BUFSIZE)
stor(filename, data)
conn.send(b'226 Transfer complete.\r\n')
else:
conn.send(b'500 Unknown command.\r\n')
conn.close()
# 创建TCP套接字
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.bind((HOST, PORT))
sock.listen(BACKLOG)
print('FTP server listening on port %d...' % PORT)
# 循环接受客户端请求
while True:
conn, addr = sock.accept()
print('Connected by', addr)
handle_request(conn)
```
需要注意的是,这只是一个简单的示例代码,实际使用中需要考虑更多的安全性、可靠性和性能方面的问题。