!Check available network node from mac address using arp and ping.

!Check available network node from mac address using arp and ping.

USAGE: ping2mac.sh [MAC address]
USAGE: ping2mac.py? [MAC address]
"ping2mac.sh" is shell script.
"ping2mac.py" is CGI. Usable http method is GET only.

  MAC address  :   Mac address to you want to confirm.

ping2mac.py

#!/bin/python


import os
import subprocess

def exec_arp(mac_addr_str):
    s = mac_addr_str.replace('-', ':')
    t = s.replace(':', '')
    if len(t) != 2 * 6:
        raise TypeError('Invalid MAC address length')
    command = 'sh ping2mac.sh ' + s
    proc = subprocess.Popen(
        command,
        shell  = True,
        stdin  = subprocess.PIPE,
        stdout = subprocess.PIPE,
        stderr = subprocess.PIPE)
    stdout_data, stderr_data = proc.communicate()
    retcode = proc.returncode
    return retcode, stdout_data, stderr_data
def app(env):
    mac_addr_str = env.get('QUERY_STRING')
    retcode, stdout_data, stderr_data = exec_arp(mac_addr_str)
    if retcode == 0:
        print 'Content-Type: text/plain'
        print
        print 'OK'
        print stdout_data
    else:
        print 'Status: 404 Not Found'
        print 'Content-Type: text/plain'
        print

if __name__ == '__main__':
    app(os.environ)

ping2mac.sh

#!/bin/sh


echo "args = $*"
macaddr=${1}
while IFS= read line;
do
  if [ "${line}" != "" ] ; then
    echo ""
    echo "----------------------------------"
    echo "  ip:${line}"
    echo "----------------------------------"
    ping -c 4 ${line} && exit 0
  else
    echo "IP of MAC address is not found. (${macaddr})" 1>&2
    exit 1
 fi
done << __END__
$(
  arp | sort | grep -i "${macaddr}" | while IFS= read line;
  do
    echo "$line" | awk '{print $1}'
  done
)
__END__

echo "no available IP address." 1>&2
exit 1

sample.js

() => {
	var url = 'ping2mac.py' + '?' + 'XX-XX-XX-XX-XX-XX'
	var req = new XMLHttpRequest();
	req.open('GET', url);
	req.onload = () => {
		if(Math.floor(req.status / 100) == 2) {
			//online event
		} else {
			//offline event
		}
	}
	req.onerror = () => {
		//error event
	}
	req.send();
};