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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