Hello Andrew,
On Fri, Sep 16, 2005 at 07:57:48PM +1000, Andrew Pollock wrote:
> I've got to say I'm not quite following what you're saying the problem
> is here. I've examined the stock "linux" dhclient-script that ships with
> the source, and I can't see how it's passing any arguments to the hooks
> either.
That's done implicit - see the following lines from
dhcp-3.0.3/client/scripts/linux bash script:
# Must be used on exit. Invokes the local dhcp client exit hooks, if any.
exit_with_hooks() {
exit_status=$1
if [ -f /etc/dhclient-exit-hooks ]; then
. /etc/dhclient-exit-hooks
fi
# probably should do something with exit status of the local script
exit $exit_status
}
Note they source the exit hooks, so the arguments are preserved
and thus available to /etc/dhclient-exit-hooks. They
even care about storing the argument to keep the exit code intact.
The arg1 is set different with the following code further down:
exit_with_hooks 0
fi
ifconfig $interface inet 0 down
exit_with_hooks 1
>
> That said, you talk about detecting failures. I had a quick play with
> the debug hook that ships with the client package, and enabled it, and
> there's a "reason" variable available to it. I tried playing with it,
> but the best I could do is get it to be set to "FAIL", not "TIMEOUT"
> that you speak of.
>
> So if you can give me an example of how you'd like this to work, I can
> see what I can do.
You have to configure some leases to try without a dhcp server,
then dhcp-client will try to ping the router configured there
and if it is available it will TIMEOUT with a different exit code
to the /etc/dhclient-exit-hooks - so that you can recognise that
your laptop is connected to the home network, for example.
I can give you log files from my laptop, so you can see that this
really works - but maybe this discussion should be taken to the
dhcp-client mailing list. I use a modified dhclient-script which even
did not need a router to be configured, because at my home network
I did'nt want to depend on one machine to be always up.
The debian bug here is that the arg1 is not propagated trough
that run_script part. My hack at the moment is the follwing:
exit_with_hooks() {
exit_status=$1
hook_arg1=$1
...
run_hook() {
...
if [ -f $script ]; then
. $script $hook_arg1
fi
...
So my setup works with this hack, but a bash expert would probably know
a better solution.
Thanks,
greetings
Hermann
--
Netzwerkadministration/Zentrale Dienste, Interdiziplinaeres
Zentrum fuer wissenschaftliches Rechnen der Universitaet Heidelberg
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