Auto-download on demand and give warning if file is old

bin/mac.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+
+# Stolen from https://raw.githubusercontent.com/Cybertinus/macvendor_extractor/master/mac.sh
+
+##########
+# CONFIG #
+##########
+
+# Download from http://standards-oui.ieee.org/oui/oui.txt
+ouilocation="${HOME}/.dot/oui.txt"
+
+#################
+# ACTUAL SCRIPT #
+#################
+
+if [ ! -f "${ouilocation}" ] ; then
+	echo "OUI location can not be found at ${ouilocation}. Have you updated the config?" 1>&2
+	read -p "Do you want to download it now [y/N]? " -n 1 -r
+	echo    # (optional) move to a new line
+	if [[ $REPLY =~ ^[Yy]$ ]]
+	then
+		wget https://standards-oui.ieee.org/oui/oui.txt -O "${ouilocation}"
+	else
+		echo "Aborted"
+		exit 1
+	fi
+fi
+
+if [[ $(find "${ouilocation}" -mtime +30 -print) ]]; then
+	echo "File ${ouilocation} is older than 30 days"
+fi
+
+if [ -z "${1}" ] ; then
+	echo 'No mac address specified, please do so as first argument' 1>&2
+	exit 2
+fi
+
+macaddress="$(echo "${1}" | sed -e 's/[-.:]//g' | tr '[:lower:]' '[:upper:]')"
+macaddress="${macaddress:0:6}"
+echo -n "${1} = "
+
+vendor="$(awk "/^${macaddress}/ {print substr(\$0,index(\$0,\$4))}" "${ouilocation}")"
+if [ -z "${vendor}" ] ; then
+	echo "Not specified in ${ouilocation}"
+else
+	echo "${vendor}"
+fi
+