From 7b86178c1dfaf5595409c77727ee29d5a1b661f0 Mon Sep 17 00:00:00 2001
From: Steffen Vogel <post@steffenvogel.de>
Date: Fri, 18 Oct 2013 14:53:34 +0200
Subject: [PATCH] added simple wrapper around bind9's nsupdate

---
 bash/nsupdate.sh | 159 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 159 insertions(+)
 create mode 100644 bash/nsupdate.sh

diff --git a/bash/nsupdate.sh b/bash/nsupdate.sh
new file mode 100644
index 0000000..b5c340c
--- /dev/null
+++ b/bash/nsupdate.sh
@@ -0,0 +1,159 @@
+#!/bin/bash
+##
+ # Bind9 nsupdate wrapper
+ #
+ # @copyright	2013 Andrew Leonard
+ # @license	http://www.apache.org/licenses/LICENSE-2.0 Apache License 2.0
+ # @author	Andrew Leonard <sysadmin@andyleonard.com>
+ # @author	Steffen Vogel <post@steffenvogel.de>
+ # @link	http://www.steffenvogel.de
+ ##
+##
+ # Licensed under the Apache License, Version 2.0 (the "License");
+ # you may not use this file except in compliance with the License.
+ # You may obtain a copy of the License at
+ #
+ # Unless required by applicable law or agreed to in writing, software
+ # distributed under the License is distributed on an "AS IS" BASIS,
+ # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ # or implied. See the License for the specific language governing
+ # permissions and limitations under the License.
+##
+
+
+function usage {
+	echo "Usage: $0 CMD [FLAGS] HOST"
+	echo
+	echo "  HOST is the hostname you want to update"
+	echo
+	echo "  CMD is one of:"
+	echo "     add, delete, update"
+	echo
+	echo "  FLAGS are:"
+	echo "     -n nameserver - DNS server to send updates to"
+	echo "     -k file - Path to private key file"
+	echo "     -y [hmac:]keyname:secret - key supplied via cli"
+	echo "     -z zone - Zone to update"
+	echo "     -t type - Record type; default is determined by -i,-4,-6 option"
+	echo "     -d data - Record data / IP address"
+	echo "     -i interface - Use the address of this interface as record data"
+	echo "     -T ttl - Time to live for updated record; default: 1h."
+	echo "     -4 / -6 use IP version"
+	exit 1
+}
+
+# parsing cmd
+if [ "$1" == "add" -o "$1" == "delete" -o "$1" == "update" ]; then
+        CMD=$1
+else
+	echo -e "missing/invalid command"
+	echo
+	usage
+fi
+
+shift 1
+
+# default options
+NS=localhost
+TTL=3600
+OPTS=
+VER=4
+
+# parse arguments
+while getopts "n:k:y:T:i:t:z:46" OPT ; do
+	case $OPT in
+		n) NS=$OPTARG ;;
+		k) KEYFILE=$OPTARG ;;
+		y) KEY=$OPTARG ;;
+		d) RDATA=$OPTARG ;;
+		t) TYPE=$OPTARG ;;
+		T) TTL=$OPTARG ;;
+		z) ZONE=$OPTARG ;;
+		i) IF=$OPTARG ;;
+		4) VER=4 ;;
+		6) VER=6 ;;
+		*) usage ;;
+	esac
+done
+
+# clear all options and reset the command line
+shift $((OPTIND-1))
+
+# parsing host
+if [ -n "$1" ]; then
+        HOST=$1
+else
+	echo -e "missing host"
+	echo
+	usage
+fi
+
+if [ -n "$KEYFILE" ] ; then
+	OPTS="-k $KEYFILE"
+elif [ -n "$KEY" ] ; then
+	OPTS="-y $KEY"
+fi
+
+if [ -z "$ZONE" ] ; then
+	echo -e "missing zone"
+	echo
+	usage
+fi
+
+if [ -z "$TYPE" ] ; then
+	case $VER in
+		4) TYPE=A ;;
+		6) TYPE=AAAA ;;
+		*)
+			echo "type missing"
+			usage
+	esac
+fi
+
+# get current IPv4/6 address from net or interface
+if [ -z "$RDATA" ] ; then
+	if [ -z "$IF" ] ; then
+		RDATA=$(curl -s 'http://checkip.dyndns.org' | sed 's/.*Current IP Address: \([0-9\.]\{7,15\}\).*/\1/')
+	else
+		RDATA=$(ip -o -$VER address show dev $IF | sed -nr 's/.*inet6? ([^/ ]+).*/\1/p')
+	fi
+
+fi
+
+OPTS="$OPTS -v"
+
+# update zone
+case $CMD in
+	add)
+		nsupdate $OPTS <<EOF
+			server $NS
+			zone $ZONE
+			update add $HOST $TTL $TYPE $RDATA
+			show
+			send
+EOF
+		exit ;;
+	delete)
+		nsupdate $OPTS <<EOF
+			server $NS
+			zone $ZONE
+			update delete $HOST $TYPE
+			show
+			send
+EOF
+		exit ;;
+	update)
+		nsupdate $OPTS <<EOF
+			server $NS
+			zone $ZONE
+			update delete $HOST $TYPE
+			update add $HOST $TTL $TYPE $RDATA
+			show
+			send
+EOF
+		exit ;;
+	*)
+		echo -e "invalid command"
+		echo
+		usage ;;
+esac