[SCRIPT] Show Active Host Information from Network

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sebsch1991
DD-WRT Novice


Joined: 11 Nov 2010
Posts: 17
PostPosted: Thu Jul 17, 2014 22:05    Post subject: [SCRIPT] Show Active Host Information from Network Reply with quote
I wrote a script that shows information about Clients in the Network!

Check criterias are
-Ping
-ARP Entries
-/etc/hosts entries
-leases from DHCP

How to install
1. Go to Webinterface -> Administration -> Commands
2. Copy script and paste it into the CommandBox!
3. Click "Save Startup"
You´re done !

Reboot your Router and wait about 5 minutes to let the script collect data! (Every IP needs 2 seconds in worst case)

Now you can visit http://Your_Routers_IP/user/status_log.html

Change the firstIP, lastIP and sleeptime variable in the script to match your private network!

Code:

## status_log.sh
## by sebsch1991
## handam000@yahoo.de
##
## This Script only works if your SubnetMask is 24 or more bit !
##
while true
do

firstIP=2.2.2.1 # Set first usable IP-Address in your Subnet here (EXAMPLE 192.168.0.0/24 -> First usable IP is 192.168.0.1)
lastIP=2.2.2.62 # Set last usable IP-Address in your Subnet here (EXAMPLE 192.168.0.0/24 -> Last usable IP is 192.168.0.254)
sleeptime=300   # Set time to wait til the script will run again and refresh the informations! (at least 2 seconds per IP in your range!)

net="$(echo $lastIP | cut -d "." -f-3)."
count=$(echo $firstIP | cut -d "." -f4)
ACTIVE_OUTPUT="`date`<br><br>Active Clients:<br><br>"
OFFLINE_OUTPUT='Known Offline Clients:<br><br>'
while [[ $count -le $(echo $lastIP| cut -d "." -f4) ]]
do
   ping=0
   arp=0
   hosts=0
   leases=0
   
   ping -c 1 -w 2 ${net}$count &> /dev/null && ping=1
   arp -a | grep -w ${net}$count | grep -v '<incomplete>' &> /dev/null && arp=1
   hosts_hostname=`grep -w ${net}${count} /etc/hosts` ; [ -z $hosts_hostname ] || hosts=1
   if [ $hosts == 0 ]
   then
   leases_hostname=`nvram get dnsmasq_lease_${net}${count} | cut -d " " -f5-`
   [ -z $leases_hostname ] || leases=1
   fi
   
   if [ $ping == 1 ] || [ $arp == 1 ]
   then
   ACTIVE_OUTPUT=${ACTIVE_OUTPUT}$(echo "${net}${count} `[ $ping == 1 ] && echo "PING "``[ $arp == 1 ] && echo "ARP "``[ $hosts == 1 ] && echo "PERMANENT_HOST $hosts_hostname "``[ $leases == 1 ] && echo "LEASES $leases_hostname "`<br>")
   elif [ $hosts == 1 ] || [ $leases == 1 ]
   then
   OFFLINE_OUTPUT=${OFFLINE_OUTPUT}$(echo "${net}${count} `[ $arp == 1 ] && echo "ARP "``[ $hosts == 1 ] && echo "PERMANENT_HOST $hosts_hostname "``[ $leases == 1 ] && echo "LEASES $leases_hostname "`<br>")
   fi
   count=$((${count}+1))
done
echo $ACTIVE_OUTPUT > /tmp/www/status_log.html
echo '<br>' >> /tmp/www/status_log.html
echo $OFFLINE_OUTPUT >> /tmp/www/status_log.html
echo '<br>' >> /tmp/www/status_log.html

echo 'Latest Log Entries:<br><br>' >> /tmp/www/status_log.html
tail -n 1000 /var/log/messages | while read line
do
   echo "$line <br>" >> /tmp/www/status_log.html
done
sleep $sleeptime
done


OUTPUT DESCRIPTION:
2.2.2.15 PING ARP PERMANENT_HOST 2.2.2.15 test-pc
2.2.2.20 PING PERMANENT_HOST 2.2.2.20 testpc2
2.2.2.50 LEASES android-91560b963c657451 01:cc:3a:61:92:12:33


test-pc is reachable by ping and listet in arp table
testpc2 is reachable by ping not listet in arp table
2.2.2.50 is not reachable and was known as a DHCP client




Tested on TP-Link 1043nd v1(r24461) - WORKING!
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sebsch1991
DD-WRT Novice


Joined: 11 Nov 2010
Posts: 17
PostPosted: Thu Jul 17, 2014 22:06    Post subject: Reply with quote
Maybe someone with better HTML Skills can help me to improve the output style!

Please report back!
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