finding authoritative nameservers
Mark Andrews
Mark_Andrews at isc.org
Tue May 20 03:21:35 UTC 2008
>
> In message <200805200216.m4K2GH8b029862 at drugs.dv.isc.org>,
> Mark Andrews <Mark_Andrews at isc.org> wrote:
>
> >> In message <200805200014.m4K0E1HR028826 at drugs.dv.isc.org>,
> >> Mark Andrews <Mark_Andrews at isc.org> wrote:
> >>
> >> > res_findzonecut().
> >> ...
> >> Sigh. So close, yet so far.
> >
> > So ask for the NS records once you have the zone name.
>
> OK. How? I really do not know how. Please enlighten me.
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
main(int argc, char **argv) {
char zonename[MAXDNAME];
unsigned char buf[0xffff];
int n;
if (!argv[1])
exit (0);
n = res_init();
if (n > 0)
n = res_findzonecut(&_res, argv[1], C_IN, 0,
zonename, sizeof(zonename), NULL, 0);
if (n > 0)
n = res_query(zonename, C_IN, T_NS, buf, sizeof(buf));
}
> > This really is not a major issue.
>
> Depends on where one sits, I guess.
>
> > You complained about res_query() before not giving you what
> > you want.
>
> I remarked about it. I did not "complain".
>
> > res_query() is only a wrapper around res_mkquery()
> > and res_send()
>
> Not quite. (I'm looking at the code, and there's a bit more to it than
> ust that.)
>
> > The functions are there. You just need to choose the right
> > ones to do the job you want done.
>
> I'm all ears.
>
>
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews at isc.org
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