#!/bin/bash
# Greps IPs and MACs
# author : Tobias Kessels
# date 	 : 26.01.2015

#grep Perl Regexpattern for MAC and IP
IP_PATTERN="(((25[0-5])|(2[0-4][0-9])|(1?\d?\d))\.){3}((25[0-5])|(2[0-4][0-9])|(1?\d?\d))"
MACID_PATTERN="(([a-fA-F0-9]{2}[:-]){5}[a-fA-F0-9]{2})|([a-f0-9]{4}\.[a-f0-9]{4}\.[a-f0-9]{4})"

#sort parameters to sort IPs correctly
IP_SORT=" -t. -k1,1n -k2,2n -k3,3n -k4,4n"

#SWITCHES & DEFAULTS
SORT=0
UNIQ=0
MAC=0
PINGABLE=0
RESOLVE=0
FILE=""
PATTERN=${IP_PATTERN}
SORT_PATTERN=${IP_SORT}

#prints usage help and exits
usage () {
echo "ipgrep [-u] [-s] [-m]"
echo ""
echo " ipgrep greps IPs or MACs from any output or file "
echo "	-s	sort Output"
echo "  -u	only show uniq IPs/MACs (implies -s)"
echo "  -p	only show 'pingable' entries (MACs still beta)"
echo "  -r  show additional information"
echo "  -m      grep MAC-IDs instead of IPs"
exit 1;
}

#process commandline switches
while getopts :husmrpf: FLAG; do
	case $FLAG in
	u)	UNIQ=1	;;
	s)	SORT=1	;;
	m)	MAC=1	;;
	p)	PINGABLE=1 ;;
	r)  RESOLVE=1 ;;
	f)	FILE=$OPTARG ;;
	h)	usage	;;
	\?)	echo "whats that: $OPTARG"
		usage	;;
	esac
done

#clear all Arguments so that 'cat $@' wont get any switches
shift $#


if [[ MAC -eq 1 ]]; then
PATTERN=${MACID_PATTERN}
SORT_PATTERN=""
fi

if [[ PINGABLE -eq 1 ]]; then
	SORT=1
	UNIQ=1
fi

filtery() {
	if [[ $MAC -eq 1 ]]; then
		cat "$@" | grep -Po "${MACID_PATTERN}"
	else
		cat "$@" | grep -Po "${IP_PATTERN}"
	fi
}

sorty() {
	if [[ $SORT -eq 1 ]] || [[ $UNIQ -eq 1 ]]
	then
		if [[ MAC -eq 1 ]]; then
			SORT_PATTERN=""
		else
			SORT_PATTERN="${IP_SORT}"
		fi

		if [[ UNIQ -eq 1 ]]; then
			cat "$@" | sort $SORT_PATTERN -u
		else
			cat "$@" | sort $SORT_PATTERN
		fi
	else
		cat "$@"
	fi
}

pingy() {
	if [[ PINGABLE -eq 1 ]]; then
		if [[ MAC -eq 1 ]]; then
			(for i in $(cat "$@")
			do
				(if (arping -c 1 -w 5000000 $i 2>/dev/null 1>/dev/null)
				then 
					echo $i
				fi)&
			done) | sorty

		else
			(for i in $(cat "$@")
			do
				(if (ping -c1 -w1 $i >/dev/null)
				then 
					echo $i
				fi)&
			done) | sorty
		fi
	else
		cat "$@"
	fi
}

resolve(){
if [[ RESOLVE -eq 1 ]]; then
		if [[ MAC -eq 1 ]]; then
			(for i in $(cat "$@")
			do
				(if (arping -q -c 1 -w 5000000 $i 2>/dev/null 1>/dev/null)
				then 
					arping -c1 $i
				fi)&
			done) | sorty

		else
			(for i in $(cat "$@")
			do
				(
					name=$(host $i |  grep -Po "(?<=pointer ).*")
					echo "$i  $name"
				)&
			done) | cat
		fi
	else
		cat "$@"
	fi
}
set -e
#execute command
if [ "$FILE" == "" ]; then
cat "$@" | filtery | sorty | pingy | resolve
else
cat $FILE | filtery | sorty | pingy | resolve
fi