Implement CIDR support using nmap -sP

test.sh

 #HOSTS_FILES="/tmp/hosts"
 verbose=0
 res_file=$(mktemp -t hosts_scanner.XXXXXXXXXX)
-pids=""
 date_cmd="date --rfc-3339=s"
 
 lock="${res_file}.lock"
 
+pids=""
 clean_exit() {
 	echo "Ctrl+C pressed, exiting..."
 	for pid in $(echo $pids)
 	exit 0
 }
 
+cidr_pids=""
+clean_cidr() {
+	echo "CIDR killed, cleaning..."
+	for pid in $(echo $cidr_pids)
+	do
+		kill $pid
+		echo $pid killed
+	done
+	exit 0
+}
+
 semlock() {
 	while [ 1 ]
 	do
 	done
 }
 
+cidr_scan() {
+	# cidr ping scan
+	# $1 cidr
+	# $2 result file
+	# $3 lock
+
+	trap clean_cidr 15
+	while [ 1 ]
+	do
+		for h in $(nmap -sP -oG - $1 | grep "Up$" | cut -d " " -f 2)
+		do
+			rehost=$(echo $h|sed 's/\./\\./g')
+			if grep -v " $rehost " $2 > /dev/null
+			then
+				printf "%30s %8s %30s\n" $h "unknw" "unknwn" >> $res_file
+				upd_ping $h $2 $3 &
+				pid=$!
+				cidr_pids="${cidr_pids}\n$pid"
+			fi
+		done
+	done
+}
+
+# prepopulate file
 for h in $(cat "$HOSTS_FILES")
 do
-	printf "%30s %8s %30s\n" $h "unknw" "unknwn" >> $res_file
+	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
-	upd_ping $h $res_file $lock &
+	if echo $h |grep -v '/' > /dev/null
+	then
+		upd_ping $h $res_file $lock &
+	else
+		# cidr scan
+		cidr_scan $h $res_file $lock &
+	fi
 	pid=$!
 	pids="${pids}\n$pid"
 	echo "$h updated by $pid" >&2
 
 while [ 1 ]
 do
+
 	semlock $lock
 	clear
 	echo "Ping radar $($date_cmd)\n"