where do I find the NTP server address with 'dhcpc -O ntpsrv' - solved

[Lambrecht Jürgen]

On 10/10/2011 05:49 PM, Lambrecht Jürgen wrote:
>
> On 10/09/2011 08:49 PM, Denys Vlasenko wrote:
> >
> > On Monday 03 October 2011 15:22, Laurent Bercot wrote:
> > > > The NTP server ip is distributed via DHCP in my case.
> > > > So I want to do 'ntpd -p $NTP_SERVER'.
> > > > But that variable $NTP_SERVER is empty, and also /etc/ntp.conf
> > does not
> > > > exist.
> > > >
> > > > Does anybody know where to find the NTP server's IP address received
> > > > with 'dhcpc -O ntpsrc' ?
> >
> > I suppose you meant "ntpsrv".
> >
> indeed
> >
> >
> >
> > >  If I understand the udhcpc.c code correctly, result of unknown 
> options
> > > listed with "-O foobar" are put into the environment via the line
> > >   ofs = sprintf(*curr, "opt%u=", i);
> >
> > But ntpsrv is a *known* option, therefore it is exported as $ntpsrv
> >
> indeed, found that out in the mean time..
> >
> > environment variable to the udhcpc script, a-la
> >
> indeed, "to the udhcpc script", and not to the shell environment
> variables as I thought wrongly
> (http://stackoverflow.com/questions/6981033/why-setenv-does-not-work)
> >
> >
> > ntpsrv='10.4.2.125 10.4.5.7'
> >
> > See examples/var_service/dhcp_if/* for an example.
> >
> ok, I will check this. Thanks. I thought that the "putenv(..)" code was
> useless, and should be removed from dhcpc.c.
>
In busybox config for dhcp client, you can specify a script, and I 
copied the default script and added 'ntpd -P $ntpsrv'.
Thanks,
Jürgen
>
>
> Regards,
> Jürgen
> >
> >
> > --
> > vda
> >
>
>
> --
> Jürgen Lambrecht
> R&D Associate
> Tel: +32 (0)51 303045    Fax: +32 (0)51 310670
> http://www.televic-rail.com
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