pythonsendcmd被动模式访问ftp

 
分析服务器发送来的PORT信息，和服务器的port建立数据连接。



#!/usr/bin/python  
# -*- coding: utf-8 -*-  
import ftplib
import os  
import socket  
import sys
  
HOST = '12.15.26.25'  
DIRN = '/file_yes'  
FILE = 'put.txt'  
host1 = '11.25.45.26'
port1 = 15245



def main():  
    try:  
        f = ftplib.FTP(HOST)  
    except (socket.error, socket.gaierror):  
        print 'ERROR:cannot reach " %s"' % HOST  
        return  
    print '***Connected to host "%s"' % HOST 
  
    try:  
        f.login('FTP002','tianyan360!@#')  
    except ftplib.error_perm:  
        print 'ERROR: cannot login FTP'  
        f.quit()  
        return  
    print '*** Logged in as "FTP"'
    print f.getwelcome()
    
    try:
        f.sendcmd('SYST')
        f.sendcmd('PWD')
        f.sendcmd('CWD /file_yes')
        f.sendcmd('PWD')
        f.sendcmd('TYPE I')
        str1= f.sendcmd('PASV')

        print str1
        str2=str1.split(',')
        print str2
        print str2[4]
        str3=str2[5].split(')')
        print str3
        print str3[0]
        port = int(str2[4])*256+int(str3[0])
        print port
            
    except ftplib.error_perm:
        print 'ERROR:error with putcmd'
        f.quit()
        return
    print '***putcmd successfully'

    #To establish a TCP connection
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    except socket.error,msg:
        print 'Failed to create socket.Error code:'+str(msg[0])+',Error message'+msg[1]
        sys.exit()
    print 'Socket Create'

    s.connect((host1,port))
    print 'Socket connect!'
    print f.sendcmd('LIST')

　　　　　#get file from ftp and print in screen

　　　　　#print f.sendcmd('RETR wordless10m.docx')
　　　　　#print s.recv(1024)
　　　　　#print 'translate successfully!'

    f.quit()
    return  
if __name__ == '__main__':  
    main()