From: "Theo de Raadt" <deraadt@openbsd.org>
Subject: Re: smtpd: spell HOST_NAME_MAX differently (for -portable)
To: "Todd C. Miller" <millert@openbsd.org>
Cc: Florian Obser <florian@openbsd.org>, Omar Polo <op@omarpolo.com>, tech@openbsd.org, gilles@poolp.org
Date: Tue, 20 Aug 2024 09:26:11 -0600

Todd C. Miller <millert@openbsd.org> wrote:

> On Tue, 20 Aug 2024 14:49:06 +0200, Florian Obser wrote:
> 
> > I think they should fix their libc.
> >
> > posix has this to say:
> >
> > {HOST_NAME_MAX}
> >     Maximum length of a host name (not including the terminating null) as ret
> > urned from the gethostname() function.
> >     Minimum Acceptable Value: {_POSIX_HOST_NAME_MAX}
> >
> > {_POSIX_HOST_NAME_MAX}
> >     Maximum length of a host name (not including the terminating null) as ret
> > urned from the gethostname() function.
> >     Value: 255
> 
> Wow, even sysconf(_SC_HOST_NAME_MAX) returns 64 on Linux with glibc.
> What a time to be alive!

We unified and increased these a decade ago.  We fixed them all, and
at the time we knew other people were going to ignore the problem and
get hurt.  It always happens....