#!/bin/sh

# 0dns-up by John Hasler 4 Apr 1999.  You may treat this program as if it
# was in the public domain.

# Rev. Dec 22 1999 to put dynaminc nameservers last.

# Rev. Aug 20 2001 to use patch from Sergio Gelato <Sergio.Gelato@astro.su.se>.

# 0dns-up sets up /etc/resolv.conf for the provider being connected to.  In
# conjunction with pppd's usepeerdns option it also handles dynamic dns.
# It expects to be passed the provider name in PPP_IPPARAM.

# If pppconfig has been removed we are not supposed to do anything.

test -f /usr/sbin/pppconfig || exit 0

PROVIDER="$PPP_IPPARAM"
ETC="/etc"
PPPRESOLV="$ETC/ppp/resolv"
RESOLVCONF="resolv.conf-dnsmasq"

# Security: we sit in the $ETC directory while we do our work.

cd "$ETC" || exit 1

# Put the resolv.conf for this provider (if it exists) in a temp file.
# If we are using dynamic dns it will be empty or contain any resolver
# options the user added.  Otherwise it will be a complete resolv.conf for
# this provider.

# Security: make sure the temp file has the right permissions from the outset.
# This script should run as root, and . should only be writable by root.
test -f $RESOLVCONF && /bin/rm -f $REDOLVCONF
umask 022

# We trust $PPPRESOLV/$PROVIDER.
test -f "$PPPRESOLV/$PROVIDER" && cat $PPPRESOLV/$PROVIDER > $RESOLVCONF

# USEPEERDNS, DNS1, and DNS2 are variables exported by pppd.  Do we have
# usepeerdns and a couple of nameservers?  If so, put a couple of
# nameserver lines in the temp file.

if [ "$USEPEERDNS" ] && [ "$DNS1" ] ; then
    echo "" >> $RESOLVCONF
    echo  "nameserver $DNS1" >> $RESOLVCONF
    if [ "$DNS2" ] ; then
        echo "" >> $RESOLVCONF
        echo  "nameserver $DNS2" >> $RESOLVCONF
    fi
fi

exit 0