From 68e246948776c9bca12913cd3cf648fc783191f9 Mon Sep 17 00:00:00 2001
From: Stefan Huber <shuber@sthu.org>
Date: Thu, 7 Nov 2013 21:56:29 +0100
Subject: [PATCH] nsd: add nsd-incrserial

---
 nsd/nsd-dynipwatch | 16 ++-------
 nsd/nsd-incrserial | 89 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 92 insertions(+), 13 deletions(-)
 create mode 100755 nsd/nsd-incrserial

diff --git a/nsd/nsd-dynipwatch b/nsd/nsd-dynipwatch
index 4a650b0..068702b 100755
--- a/nsd/nsd-dynipwatch
+++ b/nsd/nsd-dynipwatch
@@ -36,15 +36,6 @@ function setAddrInZonefile # <host> <zonefile> <addr>
 	sed -i -e "s_^\\($1\\s.*A\\s.*\\s\\)\\([0-9]\\+\\.\\)\\+[0-9]\\+_\\1$3_g" "$2"
 }
 
-function getSerialFromZonefile # <zonefile>
-{
-	awk '/; serial/{print$1}' "$1"
-}
-
-function setSerialInZonefile # <zonefile> <serial>
-{
-	sed -i -e "s_^\\(.*\\s\\)[0-9]\+\\(\\s\\+; serial.*\\)_\\1$2\\2_g" "$1"
-}
 
 function run()
 {
@@ -64,11 +55,10 @@ function run()
 		fi
 
 		if ! [ "${oldip}" = "${newip}" ]; then
-			serial=`getSerialFromZonefile "${zonefile}"`
-			serial=$(( $serial + 1))
-			echo " Update IP address. New serial ${serial}."
+			echo " Update IP address. Increment serial."
 			setAddrInZonefile "${host}" "${zonefile}" "${newip}"
-			setSerialInZonefile "${zonefile}" "${serial}"
+            nsd-incrserial "${zonefile}"
+
 			/etc/nsd3/signzone.sh sthu.org
 			nsdc rebuild && nsdc reload && nsdc notify
 		fi
diff --git a/nsd/nsd-incrserial b/nsd/nsd-incrserial
new file mode 100755
index 0000000..57028bb
--- /dev/null
+++ b/nsd/nsd-incrserial
@@ -0,0 +1,89 @@
+#!/bin/sh
+
+# Copyright (c) 2013 Stefan Huber <shuber@sthu.org>
+#
+# Permission is hereby granted, free of charge, to any person
+# obtaining a copy of this software and associated documentation
+# files (the "Software"), to deal in the Software without
+# restriction, including without limitation the rights to use,
+# copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the
+# Software is furnished to do so, subject to the following
+# conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+# OTHER DEALINGS IN THE SOFTWARE.
+
+set -e
+
+PROGNAME=$(basename $0)
+
+usage() {
+    cat <<EOF
+Increments serial in zonefile by one.
+
+Usage: $PROGNAME zonefile [OPTIONS]
+
+Options:
+    -h, --help      Print this text.
+EOF
+}
+
+TEMP=`getopt -o "h" --long "help" -n "$PROGNAME" -- "$@"`
+eval set - "$TEMP"
+
+while true; do
+    case "$1" in
+        -h | --help )
+            usage
+            exit $STATE_OK ;;
+        -- )
+            shift
+            break ;;
+        * )
+            break ;;
+    esac
+done
+
+if [ "$#" = "0" ]; then
+    echo "Not enough arguments."
+    usage
+    exit 1
+fi
+
+zonefile=$1
+if ! [ -r "${zonefile}" ]; then
+    echo "Zone file does not exist: '${zonefile}'"
+    exit 2
+fi
+
+getSerialFromZonefile() # <zonefile>
+{
+	awk '/; serial/{print$1}' "$1"
+}
+
+setSerialInZonefile() # <zonefile> <serial>
+{
+	sed -i -e "s_^\\(.*\\s\\)[0-9]\+\\(\\s\\+; serial.*\\)_\\1$2\\2_g" "$1"
+}
+
+
+serial=`getSerialFromZonefile "${zonefile}"`
+serial=$(( $serial + 1))
+
+if [ -z "$serial" ]; then
+    echo "Internal error, serial is empty."
+    exit 1
+fi
+
+setSerialInZonefile "${zonefile}" "${serial}"
+
-- 
2.39.5