From owner-freebsd-net  Mon Feb  7 13:37: 4 2000
Delivered-To: freebsd-net@freebsd.org
Received: from awfulhak.org (dynamic-56.max4-du-ws.dialnetwork.pavilion.co.uk [212.74.9.184])
	by builder.freebsd.org (Postfix) with ESMTP id 20DAB3E1F
	for <freebsd-net@freebsd.org>; Mon,  7 Feb 2000 13:36:59 -0800 (PST)
Received: from hak.lan.Awfulhak.org (root@hak.lan.Awfulhak.org [172.16.0.12])
	by awfulhak.org (8.9.3/8.9.3) with ESMTP id VAA04813;
	Mon, 7 Feb 2000 21:26:59 GMT
	(envelope-from brian@hak.lan.Awfulhak.org)
Received: from hak.lan.Awfulhak.org (brian@localhost.lan.Awfulhak.org [127.0.0.1])
	by hak.lan.Awfulhak.org (8.9.3/8.9.3) with ESMTP id VAA03499;
	Mon, 7 Feb 2000 21:27:04 GMT
	(envelope-from brian@hak.lan.Awfulhak.org)
Message-Id: <200002072127.VAA03499@hak.lan.Awfulhak.org>
X-Mailer: exmh version 2.1.1 10/15/1999
To: Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
Cc: "gbnaidu " <gbnaidu@my-Deja.com>, freebsd-net@freebsd.org,
	brian@hak.lan.Awfulhak.org
Subject: Re: How to get outgoing interface... 
In-Reply-To: Message from Garrett Wollman <wollman@khavrinen.lcs.mit.edu> 
   of "Mon, 07 Feb 2000 11:42:26 EST." <200002071642.LAA27059@khavrinen.lcs.mit.edu> 
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Date: Mon, 07 Feb 2000 21:27:04 +0000
From: Brian Somers <brian@Awfulhak.org>
Sender: owner-freebsd-net@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.org

> <<On Sun, 06 Feb 2000 21:17:21 -0800, "gbnaidu  " <gbnaidu@my-Deja.com> said:
> 
> [Paragraph reformatted for legibility.  In the future, please press
> return at the end of each 72-character line.]
> 
> > I am trying to dump the routing table using the sysctl system
> > call. I am able to get the destination address, gateway, mask all
> > these entries. But How do I get the outgoing interface for a
> > particular entry in the routing table?
> 
> Keep on looking in the routing message.  A typical response will look
> like this:
> 
> sockaddrs: <DST,GATEWAY,NETMASK,IFP,IFA>
>  default anacreon default fxp0:0.a0.c9.3c.76.5c khavrinen
> 
> You have found the first three sockaddrs in the message; the RTA_IFP
> sockaddr will tell you which interface is being used, and the RTA_IFA
> one will tell you the IP address configured on that interface.

FWIW an example can be found in src/usr.sbin/ppp/route.c - clearer 
(but less functional) than the ifconfig sources IMHO.

> -GAWollman
> 
> --
> Garrett A. Wollman   | O Siem / We are all family / O Siem / We're all the same
> wollman@lcs.mit.edu  | O Siem / The fires of freedom 
> Opinions not those of| Dance in the burning flame
> MIT, LCS, CRS, or NSA|                     - Susan Aglukark and Chad Irschick

-- 
Brian <brian@Awfulhak.org>                        <brian@FreeBSD.org>
      <http://www.Awfulhak.org>                   <brian@OpenBSD.org>
Don't _EVER_ lose your sense of humour !          <brian@FreeBSD.org.uk>




To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-net" in the body of the message