47 lines
1.7 KiB
Bash
47 lines
1.7 KiB
Bash
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#!/bin/bash
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if [ "$(awk -W version 2>/dev/null|awk '{print $1;exit}')" != "GNU" ]
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then
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echo "do 'apt-get install gawk' for this to work"
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exit 1
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fi
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export PATH=/bin:/usr/bin:/usr/sbin
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arps="$( (cat /root/arps.txt # get old list
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arp -an| # get current values
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awk -F'[().: ]' '/10.2.113/ && $6 > 100 && !/incomplete/'| # only our subnet and only addresses above 100
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awk -v now=$(date +%s) '{print $4 " " now}') | # write them with current timestamp
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awk '{arps[$1]=arps[$1]" "$2}
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END {
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for(i in arps) {
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split(arps[i],a)
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asort(a)
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print i " " a[1] " " a[length(a)] # write out mac, oldest seen and newest seen
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}
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}'|
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sort -k2 | # sort by timestamp, newest first
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sort -u -k1,1 )" # remove duplicate arp (keeps the most recent entry by timestamp)
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# echo "$arps" | sort -n -k2| awk -v onehour=$(date --date="1 hour ago" +%s) '{print $0 " " $3-onehour};c==1 && (($3 - $2)<3600*24) && ($3 > onehour) {n+=1;print "->"$0}
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Current="$(
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(date --date="1 hour ago" +"CURRENT: %s"
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echo "$arps" )|
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sort -n -k2|
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awk 'c==1 && (($3 - $2)<3600*10) && ($3 > c) {n+=1}
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/CURRENT:/{c=1}
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END{print n}'
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)"
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Current="$(
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echo "$arps" |
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sort -n -k2|
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awk -v onehour=$(date --date="1 hour ago" +%s) '
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$3 > onehour {print $0 " " $3-$2}
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' |
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awk '$3-$2 < 24*3600' |
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wc -l
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)"
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echo "$arps" > /root/arps.txt
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oldCurrent="$(cat /run/presency)"
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echo "$Current" > /run/presency
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if [ "$Current" != "$oldCurrent" ]
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then
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logger -t $(basename $0) "there are now $Current people in Level2"
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fi
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