#!/bin/sh
#----------------------------------------------------------------------------
# /etc/ppp/ipv6-up200.dns                                        __FLI4LVER__
#
# called whenever a IPv6 PPP connection over default circuit has come up
# and dnsmasq is installed
#
# Last Update:  $Id$
#----------------------------------------------------------------------------

if [ "$is_default_route" = "yes" -a -f /etc/dnsmasq.conf ]
then
    # $interface.usepeerdns existing?
    if [ -f /var/run/$interface.usepeerdns ]
    then
        read usepeerdns < /var/run/$interface.usepeerdns
    else
        usepeerdns='no'
    fi

    if [ "$usepeerdns" = "yes" ]
    then
        # dibbler sets SRV_OPTION23...
        if [ -n "$SRV_OPTION23" ]
        then
            resolv_file=/etc/resolv.dnsmasq

            if lock_resource $(basename $resolv_file) ipv6-up200.dns
            then
                if [ ! -f $resolv_file.bak ]
                then
                    mv $resolv_file $resolv_file.bak
                    echo "# x_USEPEERDNS is set" > $resolv_file
                    chown dns:dns $resolv_file
                fi
                for dns in $(echo "$SRV_OPTION23" | sed 's/ \+/\n/g' | sort -u)
                do
                    echo "nameserver $dns" >> $resolv_file
                    echo "using nameserver $dns"
                done
                killall -HUP dnsmasq
                unlock_resource $(basename $resolv_file) ipv6-up200.dns
            fi
        else
            echo "The DHCPv6 server didn't send any nameserver addresses, DNS forwarders not changed"
        fi
    else
        echo "Using peer DNS servers disabled for $interface"
    fi
fi