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#!/bin/sh
set -e
[ -x /usr/sbin/totd ] || exit 0
[ -x /lib/resolvconf/list-records ] || exit 1
TOTD_CONF=/etc/totd.conf
# Stores arguments (minus duplicates) in RSLT, separated by spaces
# Doesn't work properly if an argument itself contain whitespace
uniquify()
{
RSLT=""
while [ "$1" ] ; do
for E in $RSLT ; do
[ "$1" = "$E" ] && { shift ; continue 2 ; }
done
RSLT="${RSLT:+$RSLT }$1"
shift
done
}
ETCRESOLVCONF="/etc/resolvconf"
TMP_FILE="${ETCRESOLVCONF}/run/totd_new.$$"
clean_up() { rm -f "$TMP_FILE" ; }
trap clean_up EXIT
rm -f "$TMP_FILE"
# Get list of records, excluding all those for the loopback interface
RSLVCNFFILES="$(/lib/resolvconf/list-records | sed -e '/^lo$/d' -e '/^lo[.]/d')"
### Compile semicolon-separated list nameservers ###
NMSRVRS=""
if [ "$RSLVCNFFILES" ] ; then
uniquify $(sed -n -e 's/^[[:space:]]*nameserver[[:space:]]\+//p' $RSLVCNFFILES)
NMSRVRS="$RSLT"
fi
echo ";; totd.conf generated by $0" > "$TMP_FILE"
if [ -f $TOTD_CONF ]; then
cat $TOTD_CONF \
| sed -e 's/forwarder[[:space:]]\+//g' \
| sed -e '/^$/d'
>> $TMP_FILE
fi
for N in $NMSRVRS; do echo "forwarder $N" >> "$TMP_FILE" ; done
if [ "$1" = "-i" ] ; then
mv -f "$TMP_FILE" "$TOTD_CONF"
exit 0
fi
if [ -x /usr/bin/diff ] && [ -f "$TOTD_CONF" ] && \
/usr/bin/diff -q "$TOTD_CONF" "$TMP_FILE" > /dev/null ; then
# No change
rm -f "$TMP_FILE"
else
mv -f "$TMP_FILE" "$TOTD_CONF"
[ -x /etc/init.d/totd ] && /etc/init.d/totd restart > /dev/null 2>&1 \
|| :
fi
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