z

update/scripts/reverse_ip_lookup.sh

@@ -0,0 +1,43 @@
+#!/bin/sh
+DIG=/usr/bin/dig
+
+if [ $# -ne 1 ]; then
+	echo "Usage:";
+	echo "  $0 <ip>";
+	echo "";
+	echo "where <ip> can be an IPv4 or IPv6 IP address.";
+	exit 1;
+fi
+
+
+if [ ! -s $DIG ]; then
+	echo "Cannot find $DIG";
+	exit 2;
+fi
+
+if [ ! -x $DIG ]; then
+	echo "$DIG is not executable";
+	exit 3;
+fi
+
+IP=$1
+
+if [ "$IP" = "" ]; then
+	echo "IP value blank is not";
+fi
+
+HAS_SHORT=1
+COUNT=`$DIG -h 2>&1 | grep -c '\[no\]short'`
+if [ $COUNT -eq 0 ]; then
+	HAS_SHORT=0;
+fi
+
+if [ "$HAS_SHORT" -eq 1 ]; then
+	dig -x "$IP" +short 2>&1
+	RET=$?
+else
+	dig -x "$IP" 2>&1 | grep PTR | awk '{ print $5 }'
+	RET=$?
+fi
+
+exit $RET;