1. MikeTeo.net » Blog Archive » pysmb 0.4.5 released! Said,

   [...] more information, please visit: http://miketeo.net/wp/index.php/projects/pysmb Bookmark This Rattle… Posted in: Python, Software Development ADD [...]

2. Thorsten Kaufmann Said,

   Hi Mike,

   great piece of code and seems to work pretty flawlessly. Just one minor thing i would love to do is reuse an existing connection to a smb server. So on windows once you are logged in on a server with say explorer it wouldnt re-need authentication and would reuse the windows connection. Is that possible and how would i go about it ?

   Kind Regards and thanks in advance,
   Thorsten

3. nevdull Said,

   i’ve been searching for a python netbios name resolution module, and came across pysmb. just what i needed- native python and lightweight, thanks.

   also, wanted to let you know that i found a small error while testing NetBIOS.gethostbyname(). if a wins server returns multiple nodes in response to a query, each node is 6 bytes long: 2 bytes for flags followed by 4 bytes for the ip address. however, the code only increments by 4 bytes if multiple modes are found.

   for i in range(0, num_records):
   # In Python2, we can use socket.inet_ntoa(data[58 + i * 4:62 + i * 4]) to convert
   addrs.append(NBHostEntry(string.rstrip(qn_name[:-1]) + qn_scope, ord(qn_name[-1]), ‘%d.%d.%d.%d’ % unpack(’4B’, (data[offset:offset + 4]))))
   offset = offset + 4

   changing the offset increment to “offset = offset + 6″ solves the problem. no idea how accurate this is across all versions and types of query responses, especially since the response record contains the data length (in this case 12 when 2 unique h-records are returned).

   anyways thanks..

4. lrq3000 Said,

   As I had to make an automatic backup script uploading to a SMB share, I chose your tool as the base for my work, but I had some troubles making it work since the terminology in the documentation is somewhat obscure and no working example is provided.

   Here is a simple python script example :

   #!/bin/env python

   # Author : Stephen LARROQUE

   # DESCRIPTION : simple python script to demonstrate the use of the pysmb library to connect to a Samba share and send a file. This could be useful for other devs, as there are nearly no documentation on the web, and all other solutions aren’t as versatile and interoperable as this one (it should work on any plateform)

   import smb, nmb, getpass, os;

   fileshare = smb.SMB(‘YOURSMBHOSTNAME’, ‘YOURSMBHOSTIP’, my_name = “THEMATRIX”, host_type = nmb.TYPE_SERVER, sess_port = nmb.NETBIOS_SESSION_PORT);
   fileshare.login(‘yourlogin’, ‘password’)
   #fileshare.stor_file(‘Call’, remote_path+filename, sz.read)
   serveros = fileshare.get_server_os();
   print serveros;

   if (fileshare.is_login_required()) :
   print “Login is required on this server.”;

   print fileshare.list_shared();

   if (fileshare.list_path(“SMBSHAREMOUNT”, “PATH\*”)) :
   print “Dir exists !”;

   src_path = ‘D:/test.txt’;
   dest_service = “SMBSHAREMOUNT”;
   dest_path = “PATH/test11.txt”;
   fh = open(src_path, ‘rb’);
   fileshare.stor_file(dest_service, dest_path, fh.read);
   fh.close();

5. nevdull Said,

   hi, found another minor error, when querying a node for its status. for instance, if you want to verify the IP returned by a name query sent to a WINS server is not a stale or tombstoned reference. -query the returned IP for its nbname and check that against the original name query, (if they match all is well). in this case setting the recursion bit against a client will cause status request to be ignored.

   so, within __querynodestatus()
   …
   if destaddr:
   req = pack(‘>HHHHHH’, trn_id, 0×0100, 0×01, 0×00, 0×00, 0×00) + qn_label + pack(‘>HH’, 0×21, 0×01)
   else:
   req = pack(‘>HHHHHH’, trn_id, 0×0110, 0×01, 0×00, 0×00, 0×00) + qn_label + pack(‘>HH’, 0×21, 0×01)

   change the flags word from 0×0100 to 0×000 when destaddr is set and from 0×0110 to 0×0010 when it is not set.

6. Sujit Ghosal Said,

   Does this module handle SMB Chaining as well? Even though I didn’t go through all of the modules functions/classes I just wanted to know before I start working on it.

   - Sujit

7. Filoxb Said,

   Hello boys,
   pysmb is awesome, but if i try to use it on a shared folder with password encryption it fails(xp, linux or others)!!!
   Does it really support pasword encryption? Is there a correct way to encrypt a password?

   Please please please help!!!!!!

   Thanks

8. Stef Bon Said,

   Hi,

   I’m looking for an example to lookup the hosts in my network. Where can I find it?

   S.

9. miketeo Said,

   @Stef Bon:
   You can try the following code with pysmb-1.0.4 and above. You may need administrator privilege to run the queryName() method.

   from nmb.NetBIOS import NetBIOS

   n = NetBIOS()
print n.queryName('CETUS')
print n.queryIPForName('192.168.1.2')


10. Bob Said,

    Any ideas why same code will work against a samba server but not a Win7 system? Using smbclient I can auth and browse files on the Win7 system but with pysmb I get the following error on OSX:

    Traceback (most recent call last):
    File “”, line 1, in
    File “/Users/tanner/projects/clients/igi.com/scripts/sandbox/lib/python2.7/site-packages/smb/SMBConnection.py”, line 97, in connect
    self._pollForNetBIOSPacket(timeout)
    File “/Users/tanner/projects/clients/igi.com/scripts/sandbox/lib/python2.7/site-packages/smb/SMBConnection.py”, line 446, in _pollForNetBIOSPacket
    d = self.sock.recv(read_len)
    socket.error: [Errno 54] Connection reset by peer

11. tuckmeng Said,

    Hi,

    I keep getting a No module called _md5 when I do a from smb import SMBHandler. Wonder if there’s anything missing? I’m using AIX

12. Vashek Said,

    Hi, thanks for this great piece of work!
    Is there a bug tracker somewhere?
    It works fine for me, except for one thing: if I specify the server name as something that points to the right IP address but is not the hostname of the server (e.g. if I specify the IP address itself), the SMBConnection gets into an infinite loop somewhere and uses 100% CPU.

    Thanks again,
    Vashek

13. miketeo Said,

    @Vashek: No, there is no bug tracker for pysmb. Most developers usually email me directly for support, or use this comment section for bugs reporting. I have taken note of the bug you have mentioned, and will attempt to fix it in the next release. Thanks.

14. Ramakrishna Said,

    Hi Mike,

    Found this tool interesting. Thanks for developing and supporting this great work.

    We work on the SMB Protocol optimization and looking for an open source test tool for unit testing purposes during development.

    Can we use this tool to write customized smb protocol test scripts.

    Looking forward to hear your inputs.

15. miketeo Said,

    @Ramakrishna: Yes, you can.

16. Nitin Said,

    Hi Mike!
    Thanks for the awesome module. I have a couple of doubts though:

    1. Once a connection is made (using SMBConnection and connect method), how long does the connection last?
    2. How are the read/write calls to the CIFS server authenticated? Through a sesssion or are username and password passed along every time?

    Regards

17. miketeo Said,

    @Nitin:
    1. In development, most servers drop the connection after being idle for about 5 minutes. As documented, you should not keep the SMBConnection “idle” if you are not using it.
    2. The authentication is performed once during session setup during which the user name and password are transmitted in a secure manner. The authentication is not performed during file operations.

18. Nitin Said,

    Thanks for the prompt reply! Follow up questions

    So when the connection is made, does the server pass some kind of session token or session ID to the client? And then the client passes that token during file operations? If so, where is this ID/token stored?

    OR the server creates a session and keeps the information to itself and validates incoming requests based on IP address? And upon 5 minutes of inactivity, destroys the session?

19. miketeo Said,

    @Nitin: When the connection is established, the SMB client and server engage in a session negotiation phase which determines the variant of SMB protocol (aka SMB dialect) and also involves authenticating the remote SMB client. The session information is only useful within the authentication communication and is not being used directly in subsequent file operations. When the TCP connection is closed, the remote SMB client will need to perform the session negotiation and authentication again when it re-connects back to the server.

20. Nitin Said,

    Thanks again. And lastly I want to ask: Is there any support to connect using Active Directory’s UPNs (User Principal Names) like username@domain? I tried putting the username and domain parameters in the constructor, but it didn’t work.

    SMBConnection(username, password, my_name, remote_name, domain=”, use_ntlm_v2=True, sign_options=2)

    Actually I tried UPN with the smbclient command too, but that didn’t work either. So SMB doesn’t allow connections using UPNs?

21. miketeo Said,

    @Nitin:
    I have heard that one of the pysmb users had used pysmb to authenticate against AD successfully.

22. Nitin Said,

    Someone posted this in Nov last year, and I’m facing the same issue now: http://stackoverflow.com/questions/13252443/pysmb-windows-file-share-buffer-overflow

    Interestingly it happens only after I create a new share on the server.
    FYI: Client is a CentOS 5 machine and the server is a Win 2008 R2.

23. miketeo Said,

    @Nitin: Can you send me the tcpdump of the communication using ethereal?

24. Nitin Said,

    Hey Mike, sorry about the late reply. I’m not using listShares anymore, but I’ll send you the tcpdump soon if possible.

    Meanwhile, is there any way that listPath can return the list in batches. E.g. a folder has 1 million files, and I want the server to return the list in batches of 100. Because returning all the 1 million items together takes up too much time. I don’t see any such options for listPath in the documentation, but is it possible to play with the underlying code to make this possible?

25. miketeo Said,

    @Nitin:
    The SMBConnection class does not support asynchronous operations. You might want to look into the SMBProtocolFactory (which uses Twisted framework) and subclass the listPath method implementation in the SMBProtocol to incorporate your batched retrieval needs.

26. Nitin Said,

    Hi Mike,

    Does pysmb support SMB communications directly over TCP, port 445?

    If not, is there any way to get pysmb working with a server that doesn’t support NetBIOS?

27. miketeo Said,

    @Nitin: As of pysmb 1.1.3, pysmb does not support direct SMB over TCP. There are some modifications required to bypass the NetBIOS session setup and add in some shim NetBIOS session headers for this to work.

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