From owner-freebsd-net@FreeBSD.ORG  Fri Aug 25 22:08:14 2006
Return-Path: <owner-freebsd-net@FreeBSD.ORG>
X-Original-To: net@freebsd.org
Delivered-To: freebsd-net@FreeBSD.ORG
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 751CA16A4DA
	for <net@freebsd.org>; Fri, 25 Aug 2006 22:08:14 +0000 (UTC)
	(envelope-from prvs=julian=38535a252@elischer.org)
Received: from a50.ironport.com (a50.ironport.com [63.251.108.112])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 3B2A54415A
	for <net@freebsd.org>; Fri, 25 Aug 2006 22:08:14 +0000 (GMT)
	(envelope-from prvs=julian=38535a252@elischer.org)
Received: from unknown (HELO [192.168.2.6]) ([10.251.60.50])
	by a50.ironport.com with ESMTP; 25 Aug 2006 15:08:13 -0700
Message-ID: <44EF74CD.6080500@elischer.org>
Date: Fri, 25 Aug 2006 15:08:13 -0700
From: Julian Elischer <julian@elischer.org>
User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US;
	rv:1.7.13) Gecko/20060414
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: Julian Elischer <julian@elischer.org>
References: <44EF6E18.6090905@elischer.org>
In-Reply-To: <44EF6E18.6090905@elischer.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: FreeBSD Net <net@freebsd.org>
Subject: Re: possible patch for implementing split DNS
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 25 Aug 2006 22:08:14 -0000

Julian Elischer wrote:

> I need some processes to look elsewhere for DNS information from where 
> the rest
> of the system looks.. This patch seems to me a simple solution.
> We over-ride where the resolver looks for resolv.conf using an 
> environment variable.
> This would allow me to reset this to an application specific config 
> file that
> specifies a different server.
>
> Anyone got better ways fo doing this?


oops
patch had a bug..
here's the fixed version (permission checks were screwed up)
%diff -u ./lib/libc/net/res_init.c /tmp/res_init.c
--- ./lib/libc/net/res_init.c   Thu Sep  9 10:42:18 2004
+++ /tmp/res_init.c     Fri Aug 25 15:05:59 2006
@@ -154,6 +154,7 @@
        int nserv = 0;    /* number of nameserver records read from file */
        int haveenv = 0;
        int havesearch = 0;
+       char *conf_path;
 #ifdef RESOLVSORT
        int nsort = 0;
        char *net;
@@ -262,7 +263,10 @@
        (line[sizeof(name) - 1] == ' ' || \
         line[sizeof(name) - 1] == '\t'))
 
-       if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
+       if (issetugid() != 0 || (res_path = getenv("RESOLV_CONF")) == NULL)
+               res_path = _PATH_RESCONF;
+
+       if ((fp = fopen(res_path, "r")) != NULL) {
            /* read the config file */
            while (fgets(buf, sizeof(buf), fp) != NULL) {
                /* skip comments */