python实现最小功能的 ftp server

最近由于要在嵌入式系统中加入一个ftp功能，于是用python研究起ftp协议来。这个就是两个星期的学习的结果，它实现了一个最小功能的 ftp server。我用这个验证了我对ftp 协议的理解，可惜的是，它最终证实我的嵌入式系统还有些其他的问题，不在ftp协议的范围内，我还得从tcp/ip协议栈里找原因:-(
要使用它你得修改ftproot的设置，我用winxp自带的ftp程序验证没问题。

#import sys
import os,glob,time
import string
import socket
ftproot="f://ftp"
#faitdir="-rw-rw-rw- 1 user group 1024 Jun 12 14:13 aaa.txt/r/n/-rw-rw-rw- 1 user group 1048576 May 12 16:12 bbb.txt/r/n";
#faitData="1234567890"*102+"12/r/n"
class FtpServ:

def do_user(self):
print self.cmd[5:]
if(self.cmd[5:]=='haha/r/n'):
self.userok=1
self.connect.send("331 user name ok,need password./r/n")
else:
self.connect.send("430 user name error./r/n")
def do_pass(self):
print self.cmd[5:]
if(self.cmd[5:]=='hehe/r/n'):
if(self.userok==1):
self.logined=1
self.connect.send("230 User logged in, proceed./r/n")
else:
self.connect.send("530 who are you/r/n")
else:
self.connect.send("430 pass word error./r/n")
def do_mode(self):
if(self.comd[5]=='S'):
self.connect.send("200 stream mode is ok/r/n")
else:
self.connect.send("500 only stream mode is support/r/n")

def do_pwd(self):
#show user the directory here
self.connect.send("257 /"//" is current directory./r/n")
return
def do_noop(self):
self.connect.send("200 ok/r/n")
return
def do_type(self):
print self.cmd[5:6]
if(string.lower(self.cmd[5:6])=='i'):
self.connect.send('200 type set to I./r/n')
elif(string.lower(self.cmd[5:6])=='a'):
self.connect.send('200 type set to A./r/n')
else :
self.connect.send('500 parm error./r/n')
def do_quit(self):
self.connect.send("221 Goodbye./r/n")
def do_feat(self):
return
def do_port(self):
client=string.split(self.cmd[5:],',')
self.dataClient='.'.join(client[0:4])
self.dataPort=int(client[4])*256+int(client[5])
print "clinet ask data connect to ", self.dataClient,":",self.dataPort
self.connect.send("200 PORT Command successful./r/n")
return
def do_pasv(self):
self.connect.send("500 passive mode not supported./r/n")
#---------------------------------------------------
def do_list(self):
if(self.dataClient!=''):
self.connect.send("150 Opening data connection./r/n")
self.datasocket=socket.socket(socket.AF_INET, socket.SOCK_STREAM) #prepare for data trans
self.datasocket.connect((self.dataClient,self.dataPort))
filedir=""
for i in self.fileList.keys() :
filedir=filedir+self.fileList
self.datasocket.send(filedir)
#self.datasocket.send(faitdir)
self.datasocket.close()
self.connect.send("226 Transfer complete./r/n")
print "dir data sended."
else:
self.connect.send("503 on port specify/r/n")
return
#--------------------------------------------------
def do_retr(self):
if self.cmd[5:-2] in self.fileList.keys():
print "asking for ",self.cmd[5:-2]
file=open(ftproot+"//"+self.cmd[5:-2],"rb")
self.connect.send("150 Opening data connection./r/n")
self.datasocket=socket.socket(socket.AF_INET, socket.SOCK_STREAM) #prepare for data trans
self.datasocket.connect((self.dataClient,self.dataPort))
#self.datasocket.send(faitData)
data=file.read(1024)

while(data!=""):
self.datasocket.send(data)
#print data
data=file.read(1024)
self.datasocket.close()
self.connect.send("226 Transfer complete./r/n")
else:
self.connect.send("503 no such file/r/n")
return
#---------------------------------------------------------------------
def do_stor(self):
filename=self.cmd[5:-2]
newfile=open(filename,'w')
self.connect.send("150 Opening data connection./r/n")
self.datasocket=socket.socket(socket.AF_INET, socket.SOCK_STREAM) #prepare for data trans
self.datasocket.connect((self.dataClient,self.dataPort))
while(1):
buf=self.datasocket.recv(1400)
if(len(buf)!=0):
newfile.write(buf)
else:
self.datasocket.close()
break
newfile.close()
self.connect.send("226 Transfer complete./r/n")
print filename," received."
self.getFileList()
return
#---------------------------------------------------------------------
def getFileList(self):
self.fileList={}
tempList=glob.glob(ftproot+'//*.*')
print tempList
for i in tempList:
file=glob.glob(i)[0]
self.fileList[file[7:]]="-rw-rw-rw- 1 user group "+str(os.stat(file)[6])+" "+/
time.strftime("%m %d %H:%M",time.gmtime(os.stat(file)[8]))+" "+file[7:]+"/r/n"
print self.fileList

#---------------------------------------------------------------------
def __init__(self):
self.commands={
'USER':self.do_user,
'PASS':self.do_pass,
'LIST':self.do_list,
'PORT':self.do_port,
'RETR':self.do_retr,
'STOR':self.do_stor,
'XPWD':self.do_pwd,
'PWD':self.do_pwd,
'PASV':self.do_pasv,
'FEAT':self.do_feat,
'TYPE':self.do_type,
'NOOP':self.do_noop,
'MODE':self.do_mode,
'QUIT':self.do_quit

}
self.cmd=""
self.myHost=''
self.myPort=21
self.dataClient=''
self.dataPort=25
self.userok=0
self.logined=0
self.connect=None
self.dataconnect=None
self.fileList=[]
self.getFileList()
socket.setdefaulttimeout(50);
self.sockobj = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.sockobj.bind((self.myHost, self.myPort)) # bind it to server port number

def loop(self):
self.sockobj.listen(2) # listen, allow 5 pending connects
while(1):
print "starting ftp service"
self.connect,self.addr=self.sockobj.accept()
print 'Server connected by',self.addr
self.connect.send("220 Wellcom to CNC ftp./r/n")
while(1):
self.cmd=self.connect.recv(256)
print 'recv: ',self.cmd
if not self.cmd:
break
else:
if(self.cmd[0:4] in self.commands.keys()):
print "handle command ",self.cmd[0:4]
self.commands[self.cmd[0:4]]()
if(self.cmd[0:4]=="QUIT"):
print "client left!"
break
else:
self.connect.send("500 unkonw command./r/n")
print 'closing connection',self.addr
self.connect.close()

if __name__ == "__main__":
#print faitData
ftpserver=FtpServ()
ftpserver.loop()[code]

本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u/28470/showart_372862.html