update-serials

#!/bin/bash

# Copyright 2014-2015 Richard Russon (FlatCap)
# Licensed under the GPLv3

PATH="/var/named/bin:/usr/bin:/usr/sbin"
source log.sh

export TZ="UTC"

set -o errexit	# set -e
set -o nounset	# set -u

renice --priority 19 --pid $$ > /dev/null
ionice --class 3     --pid $$ > /dev/null

shopt -s nullglob

function finish()
{
	local RETVAL=$?
	[ $RETVAL = 0 ] || log_error "${0##*/} failed: $RETVAL"
}

function usage()
{
	echo "Usage: ${0##*/} [zonefile...]"
	exit 1
}


cd /var/named

trap finish EXIT

if [ $# = 0 ]; then
	FILE_LIST=(*.db)
	if [ ${#FILE_LIST[@]} = 0 ]; then
		echo "No zone files"
		exit 1
	fi
	DATE=""
else
	if [ "$1" = "-d" -a $# -gt 1 ]; then
		DATE="$2"
		shift 2
	fi
	for i in "$@"; do
		if [ -f "$i.db" ]; then
			FILE_LIST=($i.db)
		else
			echo "Zone file doesn't exist: $i.db"
			exit 1
		fi
	done
fi

SERIAL="${DATE:-$(date '+%Y%m%d')}00"

for FILE in ${FILE_LIST[@]}; do
	if [ ! -s "$FILE" ]; then
		echo "File doesn't exist: $FILE"
		continue
	fi

	ZONE="${FILE%.db}"

	ZONE_SERIAL=$(/usr/sbin/named-checkzone $ZONE $FILE | grep --extended-regexp --no-filename --only-matching '[0-9]{10}')
	if [ -z "$ZONE_SERIAL" ]; then
		echo "Bad zone file: $FILE"
		exit 1
	fi

	[ $ZONE_SERIAL -gt $SERIAL ] && SERIAL=$ZONE_SERIAL
done

: $((SERIAL++))

log_info "Update zone file serial numbers"
for FILE in ${FILE_LIST[@]}; do
	ZONE="${FILE%.db}"
	sed -i "s/\<[0-9]\{10\}\>/$SERIAL/" $FILE
	echo -e "\t$ZONE" "$SERIAL"
done