IP Finder als kleine Programmierübung

ip_finder.sh

#!/bin/bash

set -euo pipefail

# IP Finder als kleine Programmierübung

NAMED=/var/named/data
NETZ="${1:-}"

if [ -z "$NETZ" ]; then
	echo "$0 [netz/prefix]"
	exit 1
fi

function ip2long() {
	IP="$1"

	echo $(python -c 'import socket; import struct; print(struct.unpack("!L", socket.inet_aton("'$IP'")))[0]')
}

function long2ip() {
	LONG="$1"

	echo $(python -c 'import socket; import struct; print(socket.inet_ntoa(struct.pack("!L", '$LONG')))')
}

eval $(ipcalc -bn $NETZ)

START=$(ip2long $NETWORK)
END=$(ip2long $BROADCAST)

IP=$((START+1))

while [ $IP -lt $((END-1)) ]; do
	IPt=$(long2ip $IP)

	regexp=$(echo $IPt | sed 's/\./\\\./g;')
	grep -R -E "$regexp\$" "$NAMED" || true

	IP=$(($IP + 1))
done