[Samba] _msdcs names
Andrew Bartlett
abartlet at samba.org
Thu Jun 6 21:51:33 MDT 2013
On Wed, 2013-06-05 at 11:51 +0100, Paul Littlefield wrote:
> On 04/06/13 23:47, Andrew Bartlett wrote:
> > We really don't want that in the wiki, because you should not be putting
> > fixed things in /etc/hosts, we have to fix it another way. What we do
> > want is to know:
>
>
> Hi Andrew
>
> Thanks for picking this up!
>
>
> > - is this still an issue in GIT master?
>
>
> Not sure. When setting up our DC #1 I did originally git from samba-master, but that was a month ago. I decided to match the git revision for DC #2, and all seemed fine apart from this last little hiccup.
>
> So, it may well have been fixed in the latest git samba-master.
>
> I DO intend to keep these DCs up-to-date regularly, either from samba-master or stable whichever you think is best :-)
>
>
> > - can we detect the difference between this error and a real
> > non-existent name by looking at return codes (we had a similar issue on
> > FreeBSD, and caught it this way). I'm hoping we might just be missing
> > that fix, or there was a regression in that.
>
>
> OK.
>
>
> > We have (multiple) alternative DNS resolvers internally, and we do use
> > them. We try to use nss when we can, but fall back for the cases that
> > don't work. If we can't rely on the error code, we may have to use a
> > pre-check of the name instead.
> >
> > Any assistance tracking this down most valued, as it seems to be biting
> > folks.
>
>
> I would LOVE to help you folks out.
>
> Words cannot describe how impressed I am with Samba (through the many years I have been using it) and indeed more so now with Samba4.
>
> What would you like me to do?
Work out why this lump of code doesn't work:
source4/libcli/resolve/dns_ex.c:run_child_getaddrinfo()
ret = getaddrinfo(state->name.name, "0", &hints, &res_list);
/* try to fallback in case of error */
if (state->do_fallback) {
switch (ret) {
#ifdef EAI_NODATA
case EAI_NODATA:
#endif
case EAI_FAIL:
/* Linux returns EAI_NODATA on non-RFC1034-compliant names. FreeBSD
returns EAI_FAIL */
case EAI_NONAME:
/* getaddrinfo() doesn't handle CNAME or non-RFC1034 compatible
records */
run_child_dns_lookup(state, fd);
return;
default:
break;
}
}
if (ret != 0) {
goto done;
}
For example, work out what ret is in your case, and if it is any
different to a truly missing name.
Andrew Bartlett
--
Andrew Bartlett http://samba.org/~abartlet/
Authentication Developer, Samba Team http://samba.org
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