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