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 sysimport os,glob,timeimport stringimport socketftproot="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()

 

 

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