python实现类似ftp传输文件的网络程序示例

此代码在linux上编写，适用于linux，windows下需要更改几个命令。
1、客户端输入IP，端口，可服务器端进行连接，被要求输入用户名和密码进行验证。
2、使用独立的模块来验证登录用户(技术有限，不支持客户端创建用户),用户名：ftpuser 密码：userlogin
2、客户端登录验证成功后，可使用？或者help查看可使用的命令。

ftpserver.py
复制代码 代码如下:
#!/usr/bin/env python/' target='_blank'>python
#-*- coding:utf-8

"Program for ftp server"

from SocketServer import *
from time import *
import os
import loginauth

class MyFtp(StreamRequestHandler):
def handle(self):
try:
while True:
sleep(0.5)
self.request.sendall('auth')
name = self.request.recv(BUFSIZ)
sleep(0.5)
self.request.sendall('pauth')
password = self.request.recv(BUFSIZ)
print name,password
auth_result = loginauth.user_create(name,password)
print auth_result
if auth_result == 0:
self.request.sendall('ok2login')
break
elif auth_result == 1:
self.request.sendall('fail2login')
continue

while True:
recv_data = self.request.recv(BUFSIZ).split()
if recv_data[0] == 'rls':
result = os.popen('ls -l ./').read()
self.request.sendall(result)
continue
if recv_data[0] == '?' or recv_data[0] == 'help':
send_help = '''\033[32;1m
?\help: Get help.
Get: Downlaod file from remote server.
Send: Send local file to remote server.
ls: List local file.
rls: List remote server file.
quit\exit: Quit the application.
\033[0m'''
self.request.sendall(send_help)
continue
if recv_data[0] == 'send':
filename = recv_data[1]
self.request.sendall('ok2send')
recv_data = self.request.recv(BUFSIZ)
file2w = open(filename,'wb')
file2w.write(recv_data)
file2w.flush()
file2w.close()
self.request.sendall('\033[33;1mFile transfer successed!!!\033[0m')
continue

if recv_data[0] == 'get':
filename = recv_data[1]
if os.path.isfile(filename):
self.request.sendall('ok2get')
if self.request.recv(BUFSIZ) == 'ok2send':
self.request.sendall('sending')
sleep(0.5)
file_data = open(filename,'rb')
file_tmp = file_data.read()
self.request.sendall(file_tmp)
sleep(1)
self.request.sendall('\033[33;1mDownloading complete!\033[0m')
file_data.close()

else:
self.request.sendall('fail2get')
if self.request.recv(BUFSIZ) == 'ack':
self.request.sendall('\033[31;1m%s not found\033[0m'% filename)
except :
pass

if __name__ == '__main__':
HOST,PORT = '',9889
ADDR = (HOST,PORT)
BUFSIZ = 8192

try:
server = ThreadingTCPServer(ADDR,MyFtp)
server.serve_forever()
except KeyboardInterrupt:
server.shutdown()

loginauth.py
复制代码 代码如下:
#!/usr/bin/env Python
#-*- coding:utf-8
#Filename:userlogin.py

"Program for userlogin"

import sys,time
import cPickle as pickle

#If it's your first running this program,use USERDB = {}
#If it is not your first running this program,use USERDB = pickle.load(open('userdb','rb'))
USERDB = pickle.load(open('userdb','rb'))
#USERDB = {}

class userdb(object):
def __init__(self,username,password,time):
self.username = username
self.passwd = password
self.time = time

def save_user(self):
USERDB[self.username] = [self.passwd,self.time]
pickle.dump(USERDB,open('userdb','wb'),True)

def update_db(self):
pass

def user_create(NAME,PASSWD = ''):
if NAME in USERDB:
if PASSWD == USERDB[NAME][0]:
p = userdb(NAME,PASSWD,time.time())
p.save_user()
return 0
else:
return 1

else:
#p = userdb(NAME,PASSWD,time.time())
#p.save_user()
return 1

if __name__ == '__main__':
user_create(name,password)

ftpclient.py
复制代码 代码如下:
#!/usr/bin/env python
#-*- coding:utf-8

"Program for ftp client."

from socket import *
from time import sleep
import os

def auth():
while 1:
try:
recv_msg = s.recv(BUFSIZ)
if recv_msg == 'auth':
USER = str(raw_input('Please input your username: ')).strip()
s.sendall(USER)
if s.recv(BUFSIZ) == 'pauth':
PASS = str(raw_input('Please input your password: ')).strip()
s.sendall(PASS)
recv_msg1 = s.recv(BUFSIZ)
if recv_msg1 == 'ok2login':
print '\033[33;1mlogin success!!!\033[0m'
break
elif recv_msg1 == 'fail2login':
print '\033[33;1mlogin failure!!!\033[0m'
continue
else:
continue
except:
return 'error'

def switch():
while True:
INPUT = str(raw_input('ftp> ')).strip()
if len(INPUT) == 0:continue
elif INPUT == 'quit' or INPUT == 'exit':
s.close()
break
elif INPUT == '?' or INPUT == 'help':
s.send(INPUT)
recv_data = s.recv(BUFSIZ)
print recv_data
continue
elif INPUT == 'get' or INPUT == 'send':
print '\033[31;1mYou must specified filename!!\033[0m'
continue
elif INPUT == 'ls':
cmd = os.popen('ls -l ./').read()
print cmd
continue
elif INPUT == 'rls':
s.send(INPUT)
recv_data = s.recv(BUFSIZ)
print recv_data
continue

elif INPUT.split()[0] == 'send':
filename = INPUT.split()[1]
if os.path.isfile(filename):
print 'Sending %s......'% filename
s.sendall(INPUT)
re_data = s.recv(BUFSIZ)
if re_data == 'ok2send':
file_data = open(filename,'rb')
file_tmp = file_data.read()
file_data.close()
s.sendall(file_tmp)
sleep(0.5)
recv_data = s.recv(BUFSIZ)
print recv_data
continue
else:continue
else:
print '\033[31;1m%s not found!\033[0m'% filename

elif INPUT.split()[0] == 'get':
filename = INPUT.split()[1]
s.sendall(INPUT)
msg1 = s.recv(BUFSIZ)
if msg1 == 'ok2get':
s.sendall('ok2send')
msg2 = s.recv(BUFSIZ)
if msg2 == 'sending':
file_data = s.recv(BUFSIZ)
file2w = open(filename,'wb')
file2w.write(file_data)
file2w.flush()
file2w.close()
msg3 = s.recv(BUFSIZ)
print msg3
continue
elif msg1 == 'fail2get':
s.send('ack')
msg4 = s.recv(BUFSIZ)
print msg4
continue
else:
continue

if __name__ == '__main__':
#Default 127.0.0.1
HOST = str(raw_input('Server IP: ')).strip()
#Defautl 9889
PORT = int(raw_input('Server PORT: '))
ADDR = (HOST,PORT)
BUFSIZ = 8192

s = socket(AF_INET,SOCK_STREAM)
try:
s.connect(ADDR)
except :
pass

if auth() == 'error':
print 'Connection refused.'
else:
switch()