Date: Tue, 30 Jun 1998 15:42:22 +0200 (CEST) From: Andrzej Bialecki <abial@nask.pl> To: Jim Shankland <jas@flyingfox.com> Cc: freebsd-current@FreeBSD.ORG Subject: Re: Retrieving routing table via sysctl Message-ID: <Pine.NEB.3.95.980630154154.2425A-100000@korin.warman.org.pl> In-Reply-To: <199806301327.GAA09844@biggusdiskus.flyingfox.com>
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On Tue, 30 Jun 1998, Jim Shankland wrote:
> Andrzej Bialecki <abial@nask.pl> writes:
>
> > There are sysctl's which are named appropriately, but what they return
> > is a series of struct rt_msghdr, which doesn't contain the struct
> > sockaddr of the route itself and of the gateway... (I'm speaking here
> > about:
> >
> > int mib[]={CTL_NET,PF_ROUTE,0,0,NET_RT_DUMP};
> > )
> >
> > I'd like to be able to do this _without_ resorting to kread and friends,
> > so that it works on a stripped kernel.
>
> The sockaddr's immediately follow the struct rt_msghdr; flags in the
> struct rt_msghdr tell you which sockaddr's are present. Beware: the
> sockaddr for a netmask is only 8 bytes long. When in doubt, check
> against the kernel source, and/or carefully eyeball several sets of
> sample output. This is not for the faint of heart, but it can be
> made to work.
Thanks to all who replied - I'll try this.
Andrzej Bialecki
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abial@nask.pl | if(halt_per_mth > 0) { fetch("http://www.freebsd.org") }
Research & Academic | "Be open-minded, but don't let your brains to fall out."
Network in Poland | All of the above (and more) is just my personal opinion.
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