Subject: Re: Bind to local iface: bug or feautre.
To: Assar Westerlund <firstname.lastname@example.org>
From: Jesus M. Gonzalez <email@example.com>
Date: 11/26/1996 12:31:16
Assar Westerlund writes:
> "Jesus M. Gonzalez" <firstname.lastname@example.org> writes:
> > NetBSD returns an error when binding an UDP address where
> > the host address matchs a local iface (instead of the more used
> > INADDR_ANY). I'm not familar with the networking code,
> > and I'm not sure if this is a bug or a feature... Could somebody
> > tell me, so that I send-pr it if it is a bug?
> It's not a bug, or perhaps it is. The sockaddr_in needs to zeroed out
> because a bit-by-bit comparison is done in `in_pcbbind' with
Thanks, Assar. I went to the sources, and yeah, there is it.
I has a look at Stevens' book, and I saw the comment regarding the
zeroing of the sockaddr_in. But I wonder if this shouln't be changed
(fixed). Since all teh code is in a INET-dependent section, shouldn't
the comparasion be made just between the host_addr parts of the
involved sockaddr_ins? This is what seems to be done in Linux (though
the code is quite different). And anyway, it's rather surprising
that you don't need to zero the sockaddr_in if you use INADDR_ANY,
but you *need* to if you use any other address...
Any more opoinions about this being a bug? (Just to be
sure of your opinion before filing a PR).
Jesus M. Gonzalez Barahona | addr.: c/ Butarque, 15
Grupo de Sistemas y Comunicaciones | 28911 Leganes, Spain
Departamento de Informatica | tel: +34 1 624 94 58
Universidad Carlos III de Madrid | fax: +34 1 624 94 30
e-mail: email@example.com | www: http://ordago.gsyc.inf.uc3m.es/~jgb