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30 lines
532 B
Bash
30 lines
532 B
Bash
#!/bin/bash
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# $Id: reverse_dns.sh 4 2015-02-17 20:14:59Z jo $
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#
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# Usage: reverse_dns.sh IP
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# Uses the dnsmasq query log to lookup the name
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# that was last queried to return the given IP.
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#
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IP=$1
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qmIP=`echo $IP | sed 's#\.#\\.#g'`
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LOG=/var/log/dnsmasq.log
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IP_regex='^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$'
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if ! [[ $IP =~ $IP_regex ]]; then
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echo -n $IP
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exit
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fi
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NAME=`tac $LOG | \
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grep " is $IP" | head -1 | \
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sed "s#.* \([^ ]*\) is $qmIP.*#\1#" `
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if [ -z "$NAME" ]; then
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echo -n $IP
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else
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echo -n $NAME
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fi
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