[Resolvconf-devel] Bug#705582: Please add option PREFER_IPV6

[Thomas Hood]

Package: resolvconf
Version: 1.71
Severity: wishlist

---------- Forwarded message ----------
From: Pali Rohár <pali.rohar at gmail.com>
Date: Sun, Apr 14, 2013 at 8:31 PM
Subject: [Resolvconf-devel] [PATCH] Add option PREFER_IPV6
To: resolvconf-devel at lists.alioth.debian.org

Hello,

I created small patch which adding new env option PREFER_IPV6.
When is set to YES then libc resolvconf updater will add ipv6
nameservers before ipv4 in /etc/resolv.conf. This is usefull if
you want to prefer using nameservers via ipv6 protocol.

Patch was generated against ubuntu resolvconf version 1.67ubuntu2.

--- etc/resolvconf/update.d/libc.orig   2013-04-02 15:27:34.017686814 +0200
+++ etc/resolvconf/update.d/libc        2013-04-02 15:37:55.121668638 +0200
@@ -87,6 +87,21 @@ uniquify()
        done
 }

+ipv6_nameserver_list()
+{
+       while [ "$1" ] ; do
+               case "$1" in (*:*) : ;; (*) shift ; continue ;; esac
+               for E in $NMSRVRS ; do
+                       [ "$1" = "$E" ] && { shift ; continue 2 ; }
+               done
+               NMSRVRS="${NMSRVRS:+$NMSRVRS }$1"
+               case "$TRUNCATE_NAMESERVER_LIST_AFTER_LOOPBACK_ADDRESS" in
(y|Y|yes|YES|Yes) case "$1" in (127.*|::1) return 0 ;;
esac ;; esac
+               N=$(($N + 1))
+               [ "$N" = 3 ] && return 0
+               shift
+       done
+}
+
 # Args are candidate items not containing spaces
 # Returns NSMSRVS -- space-separate list of no more than 3 items,
 #                    without duplicates,
@@ -95,6 +110,7 @@ uniquify_nameserver_list()
 {
        NMSRVRS=""
        N=0
+       case "$PREFER_IPV6" in (y|Y|yes|YES|Yes) ipv6_nameserver_list "$@"
;; esac
        while [ "$1" ] ; do
                for E in $NMSRVRS ; do
                        [ "$1" = "$E" ] && { shift ; continue 2 ; }


--
Pali Rohár
pali.rohar at gmail.com

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