ping_radar/ping_radar.sh

#!/bin/sh
#Ping Radar : ping a list of hosts and display response time
#Copyright (C) 2016 Weber Yann
#
#This program is free software; you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation; either version 3 of the License, or
#any later version.
#
#This program is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#GNU General Public License for more details.
#
#You should have received a copy of the GNU General Public License
#along with this program.  If not, see <http://www.gnu.org/licenses/>.


REFRESH=2
HOSTS_FILES="$HOME/.hosts_scanner"
verbose=0
res_file=$(mktemp -t hosts_scanner.XXXXXXXXXX)
date_cmd="date --rfc-3339=s"

lock="${res_file}.lock"

pids=""
clean_exit() {
	clear
	reset
	echo "Ctrl+C pressed, exiting..."
	for pid in $(echo $pids)
	do
		echo killing $pid
		kill $pid
	done
	for pid in $(echo $pids)
	do
		wait $pid
		echo $pid killed
	done
	rmdir ${res_file}.lock 2>/dev/null
	rm -v $res_file
	exit 0
}

cidr_pids=""
clean_cidr() {
	echo "CIDR killed, cleaning..."
	for pid in $(echo $cidr_pids)
	do
		echo CIDR killing $pid
		kill $pid
		wait $pid
		echo CIDR $pid killed
	done
	exit 0
}

semlock() {
	while [ 1 ]
	do
		mkdir $1 2>/dev/null && break
	done
}

semrelease() {
	rmdir $1
}

trap clean_exit 2

upd_ping() {
	# update ping stat file
	# $1 host
	# $2 file
	# $3 lock
	# $4 delay

	lock="$3"
	test -z "$4" && delay=5 || delay=$4
	last_up="never"
	
	while [ 1 ]
	do
		rep=$(ping -qc 1 $1 2>/dev/null  )
		ret=$?
		rep=$(echo $rep | sed -nE 's/.*rtt min\/avg\/max\/mdev = [0-9]+\.[0-9]+\/([0-9]+\.[0-9]+)\/.*$/\1/p')
		rehost=$(echo $h|sed 's/\./\\./g')

		semlock $lock


		if [ $ret -eq 0 ]
		then
			last_up=$($date_cmd)
			#echo "${res}$rep $hstr $last_up" >> $2
		else
			rep="down"
			#echo "${res}down $hstr $last_up" >> $2
		fi

		sed -i "s/^\\s*$rehost\\s.*$/$(printf "%30s %8s %30s\n" $1 $rep "$last_up")/" "$2"

		semrelease $lock

		sleep $delay
	done
}

cidr_scan() {
	# cidr ping scan
	# $1 cidr
	# $2 result file
	# $3 lock
	# $4 delay

	test -z "$4" && delay=5 || delay=$4

	trap clean_cidr 15
	while [ 1 ]
	do
		semlock $lock
		echo "CIDR scanning $1" >&2
		semrelease $lock

		for h in $(nmap -sP -oG - $1 | grep "Up$" | cut -d " " -f 2)
		do
			rehost=$(echo $h|sed 's/\./\\./g')
			if grep " $rehost " $2 > /dev/null
			then
				continue
			else
				printf "%30s %8s %30s\n" $h "unknw" "unknwn" >> $res_file
				upd_ping $h $2 $3 &
				pid=$!
				cidr_pids="${cidr_pids}\n$pid"

				semlock $lock
				echo "$pid scanning $h" >&2
				semrelease $lock
			fi
		done

		semlock $lock
		echo "CIDR scanned $1" >&2
		semrelease $lock

		sleep $delay
	done
}

# prepopulate file
for h in $(cat "$HOSTS_FILES")
do
	if echo $h |grep -v '/' > /dev/null
	then
		printf "%30s %8s %30s\n" $h "unknw" "unknwn" >> $res_file
	fi
done

# run scanners
for h in $(cat "$HOSTS_FILES" )
do
	if echo $h |grep -v '/' > /dev/null
	then
		upd_ping $h $res_file $lock 5 &
	else
		# cidr scan
		cidr_scan $h $res_file $lock 10 &
	fi
	pid=$!
	pids="${pids}\n$pid"
	echo "$h updated by $pid" >&2
done
sleep 1

while [ 1 ]
do
	#sleep 1
	#continue

	semlock $lock
	clear
	echo "Ping radar $($date_cmd)\n"
	printf "%30s %8s %30s\n" "host" "ping" "last up"
	for i in $(seq 70); do echo -n "="; done
	echo ""

	#cat $res_file

	#grep -v " down " $res_file
	#grep " down " $res_file

	sed -E -e "s/\snever$/$(tput sgr0)\0/" -e "s/^.* down .*$/$(tput setaf 1)\0$(tput sgr0)/"  $res_file

	semrelease $lock
	sleep $REFRESH
done