python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。


 2 
 3 #!/usr/bin/python  
 4 # -*- coding: utf-8 -*-  
 5 import ftplib
 6 import os  
 7 import socket  
 8 import sys
 9   
10 HOST = ‘12.15.26.25‘  
11 DIRN = ‘/file_yes‘  
12 FILE = ‘put.txt‘  
13 host1 = ‘11.25.45.26‘
14 port1 = 15245
15 
16 
17 
18 def main():  
19     try:  
20         f = ftplib.FTP(HOST)  
21     except (socket.error, socket.gaierror):  
22         print ‘ERROR:cannot reach " %s"‘ % HOST  
23         return  
24     print ‘***Connected to host "%s"‘ % HOST 
25   
26     try:  
27         f.login(‘FTP002‘,‘tianyan360!@#‘)  
28     except ftplib.error_perm:  
29         print ‘ERROR: cannot login FTP‘  
30         f.quit()  
31         return  
32     print ‘*** Logged in as "FTP"‘
33     print f.getwelcome()
34     
35     try:
36         f.sendcmd(‘SYST‘)
37         f.sendcmd(‘PWD‘)
38         f.sendcmd(‘CWD /file_yes‘)
39         f.sendcmd(‘PWD‘)
40         f.sendcmd(‘TYPE I‘)
41         str1= f.sendcmd(‘PASV‘)
42 
43         print str1
44         str2=str1.split(‘,‘)
45         print str2
46         print str2[4]
47         str3=str2[5].split(‘)‘)
48         print str3
49         print str3[0]
50         port = int(str2[4])*256+int(str3[0])
51         print port
52             
53     except ftplib.error_perm:
54         print ‘ERROR:error with putcmd‘
55         f.quit()
56         return
57     print ‘***putcmd successfully‘
58 
59     #To establish a TCP connection
60     try:
61         s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
62     except socket.error,msg:
63         print ‘Failed to create socket.Error code:‘+str(msg[0])+‘,Error message‘+msg[1]
64         sys.exit()
65     print ‘Socket Create‘
66 
67     s.connect((host1,port))
68     print ‘Socket connect!‘
69     print f.sendcmd(‘LIST‘)
70 
71     f.quit()
72     return  
73 if __name__ == ‘__main__‘:  
74     main()