From: Paul Hewlett (paulgccs.co.za)
Date: Mon Dec 03 2007 - 09:30:07 CST

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On Monday 03 December 2007 17:05:46 Wietse Venema wrote:
> Paul Hewlett:
> > On Monday 03 December 2007 16:16:05 Wietse Venema wrote:
> > > Paul Hewlett:
> > > > I recently upgraded from 2.3.6 to 2.4.5 on my Gentoo master box and
> > > > postfix is now unable to get the domainname - it insists that it is
> > > > 'localdomain'.
> > >
> > > Postfix uses the gethostname() system library routine. What is the
> > > result from that function?
> > >
> > > If the result from gethostname() is a fully qualified name
> > > ("sundown.cpt.gccs.co.za") then Postfix will use that to derive
> > > the mydomain value ("cpt.gccs.co.za");
> > >
> > > If the result from gethostname() is an unqualified name ("sundown")
> > > then Postfix sets mydomain to "localdomain" unless you specify
> > > mydomain or myhostname in main.cf.
> > >
> > > Wietse
> >
> > Wietse
> >
> > I downgraded to 2.3.6 and mail is now sent successfully using the same
> > config files.
> >
> > /var/log/messages shows:
> > Dec 3 16:51:36 sundown postfix/qmgr[24971]: 1F736737D4C:
> > from=<rootsundown.cpt.gccs.co.za>, size=596, nrcpt=1 (queue active)
> > Dec 3 16:51:36 sundown postfix/smtp[24977]: 1F736737D4C:
> > to=<supportcpt.gccs.co.za>, orig_to=<root>,
> > relay=smtp.cpt.gccs.co.za[192.168.169.1]:25, delay=0.01,
> > delays=0.01/0/0/0, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as
> > 1D48018E142)
> >
> > As you can see $mydomain is now 'cpt.gccs.co.za' and the mail is now sent
> > correctly. It's a bug in 2.4.5 and beyond.
>
> Would it be possible to actually answer my question?
>
> $ cat >x.c
> #include <unistd.h>
> #include <stdlib.h>
> #include <stdio.h>
>
> #define MAXNAME 1024
>
> int main(void)
> {
> char namebuf[MAXNAME];
>
> if (gethostname(namebuf, sizeof(namebuf)) != 0)
> perror("gethostname");
> else
> printf("%.*s\n", MAXNAME, namebuf);
> exit(0);
> }
> $ make x
> $ ./x
>
> What is the output from the last command?
>
> Wietse

Wietse

and if I modify the above to call 'getdomainname' I get (none).

Paul

--
Paul Hewlett Technical Director
Global Call Center Solutions Ltd, 2nd Floor, Milnerton Mall
Cnr Loxton & Koeberg Roads, 7435 Milnerton
www.gccs.co.za
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