pyftpdlib 默认是被动模式,如果没有设置数据传输默认端口范围,则默认为60000-65535。这就需要服务端开放命令端口21和数据范围端口
FTP传输协议
- 双向传输:需要建立两个TCP连接,一个用于传输命令,一个用于传输数据
- 21端口用于传输命令端口
- 主动模式:在客户端连接21端口时发送一个数据传输端口,以便可以让服务端使用20端口来连接。要求客户端开放防火墙
- 被动模式:要求服务端开启数据传输端口
pyftpdlib 基础FTP服务
import os
from pyftpdlib.authorizers import DummyAuthorizer
from pyftpdlib.handlers import FTPHandler
from pyftpdlib.servers import FTPServer
def main():
# Instantiate a dummy authorizer for managing 'virtual' users
authorizer = DummyAuthorizer()
# Define a new user having full r/w permissions and a read-only
# anonymous user
authorizer.add_user('user', '12345', '.', perm='elradfmwMT')
authorizer.add_anonymous(os.getcwd())
# Instantiate FTP handler class
handler = FTPHandler
handler.authorizer = authorizer
# Define a customized banner (string returned when client connects)
handler.banner = "pyftpdlib based ftpd ready."
# Specify a masquerade address and the range of ports to use for
# passive connections. Decomment in case you're behind a NAT.
#handler.masquerade_address = '151.25.42.11'
#handler.passive_ports = range(60000, 65535)
# Instantiate FTP server class and listen on 0.0.0.0:2121
address = ('', 2121)
server = FTPServer(address, handler)
# set a limit for connections
server.max_cons = 256
server.max_cons_per_ip = 5
# start ftp server
server.serve_forever()
if __name__ == '__main__':
main()