ouilookup

#!/bin/sh
#!/usr/bin/perl
# (c) 2024 Leif Sawyer
# License: GPL 3.0 (see https://github.com/akhepcat/)
# Permanent home:  https://github.com/akhepcat/Miscellaneous/
# Direct download: https://raw.githubusercontent.com/akhepcat/Miscellaneous/master/ouilookup
#
# Very basic wrapper to download, install, and search the IEEE oui.txt registry
#

OUIfile=$(find /usr/share/misc/ /etc/ /usr/local/etc/ -maxdepth 1 -iname oui.txt | head -1)
REFRESH=0
DAYSOLD=90	# How many days before we force refresh the oui file

if [ ! -e "${OUIfile}" ]
then
        REFRESH=1
else
        # it exists, so check the age
        AGE=$(stat  --format="%Y" "${OUIfile}" 2>/dev/null)
        NOW=$(date "+%s")

        if [ $(( NOW - AGE )) -gt $(( 86400 * DAYSOLD )) ]
        then
                REFRESH=1
        fi
fi

if [ ${REFRESH:-0} -eq 1 ]
then
        echo "updating OUI file"
        OUIfile=/usr/share/misc/oui.txt
	sudo wget -q -O ${OUIfile}  "http://standards-oui.ieee.org/oui.txt"
	sudo chmod +r ${OUIfile}
fi

if [ $# -eq 0 ]
then
  echo "Usage: ouilookup [mac]"
  echo ""
  exit 1
fi
OUI=$(echo $1 | tr -d ':.-' | cut -c -6)

grep -i $OUI ${OUIfile}
echo