simple mac address lookup

findmac.sh

#!/bin/bash
#
#  description: simple mac address lookup
#      version: 0.3
#
# mac address src: https://code.wireshark.org/review/gitweb?p=wireshark.git;a=blob_plain;f=manuf
#

_uri='https://code.wireshark.org/review/gitweb?p=wireshark.git;a=blob_plain;f=manuf'
_macfile=/tmp/mac.txt

input=$1
t48h=172800

f_download () {
if [ ! -s "${_macfile}" ]; then
        echo "Downloading mac address listing .."
        curl -Lko "${_macfile}" "${_uri}"
elif [ $(date +%s) -ge $(( $(stat ${_macfile} -c %Z) + ${t48h} )) ]; then
        echo "Updating mac address listing .."
        curl -sLko "${_macfile}" "${_uri}"
fi
}

f_find_mac () {
if [ -r $1 ]; then
        grep -i $(echo $1 | awk -F "[.:-]" 'BEGIN{OFS=""} $1=$1' | sed 's/../&:/g;s/:$//g' | cut -b -8) "${_macfile}"
else
        grep -i $(echo $1 | sed -r 's/[:.-]//g;s/../&:/g' | cut -b -8) "${_macfile}"
fi
}

f_parse_file () {
echo -e "\nVLAN  MAC ADDRESS    TYPE        PORT   VENDOR"
grep DYNAMIC $1 | sort -k 4,4 -V | while read -r line; do
         echo "$line $(f_find_mac $(echo $line | cut -d ' ' -f2) | awk '$1=""; $0')"
done
echo ""
}

f_usage () {
cat <<-EOF

$(basename $0) takes one argument, single mac address or input file*.

 mac address:   - can be the following formats: 000000000000, 00:00:00:00:00:00, 00-00-00-00-00-00, 0000.0000.0000
 input file*:   - format of cisco show mac address-table (shown below):

 * if input doesn't exist, we assume it's a mac address


 Example file: (simply copy/paste into text file, the script looks for DYNAMIC type only)

          Mac Address Table
 -------------------------------------------

 Vlan    Mac Address       Type        Ports
 ----    -----------       --------    -----
  All    0100.0ccc.cccc    STATIC      CPU
  All    0100.0ccc.cccd    STATIC      CPU
 [snip]
  All    0180.c200.0010    STATIC      CPU
  All    ffff.ffff.ffff    STATIC      CPU
   11    0008.2f86.0919    DYNAMIC     Gi0/1
   11    0012.7c03.77bf    DYNAMIC     Fa0/3
   11    0021.7b20.1c79    DYNAMIC     Gi0/1
   11    0021.7b20.2337    DYNAMIC     Fa0/1
   11    00a0.0308.5ed4    DYNAMIC     Gi0/1
   11    4c02.890c.4597    DYNAMIC     Gi0/1
   11    5852.8a8c.2bdb    DYNAMIC     Fa0/4
 Total Mac Addresses for this criterion: 27

EOF
}

#f_find_mac $1
#exit 0
if [ $# -lt 1 ]; then
        f_usage
        exit
elif [ ! -s $input -a ! -r $input ]; then
        f_download
        f_find_mac $1
        exit
fi

f_download
f_parse_file $1