[Samba] How to send a domain wide message with smbclient?

Andrew Gaffney agaffney at skylineaero.com
Mon Dec 29 15:04:57 GMT 2003

 From a quick glance at the script, it does the same thing as the script that I posted.

Travis L. Bean wrote:
> I found a working script to send a domain wide message:
> http://www.netsys.com/sunmgr/1998-10/msg00122.html.  This is a modified
> version of the /examples/misc/wall.perl included in the Samba 3.x.x
> distribution.  The wall.perl script in the Samba distribution appears to
> be broken, because it does not send a message unless a host name is
> provided.  Perhaps someone on the samba team would be so kind as to view
> the differences between these two scripts and incorporate these
> modifications into the wall.perl script that is included in the Samba
> distribution.  
> Thanks, 
> Travis
> -----Original Message-----
> From: Andrew Gaffney [mailto:agaffney at skylineaero.com] 
> Sent: Sunday, December 28, 2003 6:05 AM
> To: Travis L. Bean
> Cc: samba at lists.samba.org
> Subject: Re: [Samba] How to send a domain wide message with smbclient?
> Travis L. Bean wrote:
>>Is there a way to send a message to all users currently logged into a 
>>Samba domain controller?  The reason why I ask is that I have a Samba 
>>3.x.x primary/backup domain controller setup and as soon as the system
>>monitor detects that the primary domain controller is offline I would 
>>like to execute a command to send a domain wide message telling all 
>>domain users to save their work to the local machine, log off the pdc 
>>and log back in to the bdc.  Is there a way to accomplish this with 
>>smbclient or another open source software solution?
> You can send a message with a command such as 'echo "Testing" |
> smbclient -M <machine>'. I 
> don't know if there is a way to send a message to all clients. You could
> try to do it 
> yourself. If you have any bash/sed/awk or perl abilities, you could
> write a script that 
> parses the output of 'smbstatus' to determine which clients are
> currently logged on to the 
> domain. It could then go through a loop and send the message to every
> client. In perl:
> #!/usr/bin/perl
> open PIPE, "smbstatus |";
> foreach $line (<PIPE>) {
>    if($line =~ /\d+\s+(\S+)\s+\S+\s+(\S+)\s+\((.+)\)/) {
>      system "echo 'Attention user $1! PDC is down. Please save all work
> to local disk, 
> logout, and log back in on the BDC.' | smbclient -M $2 -I $3";
>    }
> }
> I ran a brief test on this and it appears to work correctly with 3.0.1.

Andrew Gaffney

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