New script, new directory

Add a new script : this script can be used to create a network range.

NETWORKING/SCR_5018_V00_NUAC-IP-Network-creation.sh

@@ -0,0 +1,119 @@
+#!/bin/bash
+
+# Shell : Bash
+# Description : Small IPv4 Calculator
+# Author : razique.mahroua@gmail.com
+# Actual version : Version 00
+
+# 		Revision note    
+# V00 : Initial version
+
+# This script can be used to create a network range. It calculates the broadcast and all the usables IP for a provided range, then generates the command lines to paste !
+
+# 		Usage
+# chmod +x SCR_5018_$version_NUAC-IP-Network-creation.sh
+# ./SCR_5018_$version_NUAC-IP-Network-creation.sh "192.168.0.1/24"           
+
+# Binaries
+	CUT=/usr/bin/cut
+	IP=/bin/ip
+	IFCONFIG=/sbin/ifconfig
+# Settings
+	DEBUG=0
+	RANGE_T0_CREATE="$1"
+	INTERFACE_TO_USE="$2"
+	IP_VALIDATION=0
+	MASQ_VALIDATION=0
+
+if [ $#  -ne "2" ]; then 
+	echo "USAGE : $0 NETWORK-RANGE/CIDR DEVICE, e.g $0 192.168.1.0/24 eth0"
+	exit 0;
+fi
+
+function ip_validation() {
+	# We first extract the adresses and the netmask 
+	NETWORK=`echo $1 | cut -f 1 -d "/"`
+	CIDR_MASQ=`echo $1 | cut -f 2 -d "/"`
+
+ 	# We validate the IP adress	
+	if ! [[ $NETWORK =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
+		echo "This does not seem to be a valid IP, please submit a correct ipv4 address."
+		exit 0
+	else
+		IP_VALIDATION=1
+	fi
+
+	# We then check the netmask
+	if ! [[ $CIDR_MASQ =~ ^[0-9]+$ ]]; then
+		echo "This does not seem to be a valid CIDR notation, try again."
+		exit 0;
+	else
+		if [[ $CIDR_MASQ -gt "32" || $CIDR_MASQ -lt 1 ]]; then
+			echo "This does not seem to be a valid CIDR notation, try again."
+			exit 0;
+		else
+			MASQ_VALIDATION=1
+		fi
+	fi
+
+	# We are now ready to initialize all the values
+	if [[ $IP_VALIDATION -eq "1" && $MASQ_VALIDATION -eq 1 ]]; then
+		NETWORK_SEGMENT=`echo $NETWORK | $CUT -f 1,2,3 -d "."`
+		HOST_SEGMENT=`echo $NETWORK | $CUT -f 4 -d "."`
+		AVAILABLE_IPS=$((2**(32-$CIDR_MASQ)))
+		AVAILABLE_HOSTS=$(($AVAILABLE_IPS-2))
+		FIRST_HOST_IP=$(($HOST_SEGMENT+1))
+		BROADCAST_IP=$(($HOST_SEGMENT+$((AVAILABLE_IPS-1))))
+		LAST_HOST_IP=$(($BROADCAST_IP-1))
+		FULL_FIRST_HOST_IP=$NETWORK_SEGMENT.$FIRST_HOST_IP
+		FULL_LAST_HOST_IP=$NETWORK_SEGMENT.$LAST_HOST_IP
+		FULL_BROADCAST_IP=$NETWORK_SEGMENT.$BROADCAST_IP
+		GATEWAY_IP=$NETWORK_SEGMENT.$(($HOST_SEGMENT+1))
+	fi
+}
+
+function interface_validation() {
+	INTERFACE=$1
+	INTERFACE_EXISTS=`$IFCONFIG | grep $INTERFACE | wc -l`
+	if [ $INTERFACE != "lo" ]; then 
+		if [ $INTERFACE_EXISTS -ne "1" ]; then
+			echo "Non existent interface, try again."
+			exit 0;
+		fi
+	fi
+}
+
+# Let's validate the input
+interface_validation $INTERFACE_TO_USE
+ip_validation $RANGE_T0_CREATE
+
+echo -e "\t Interface to use : $INTERFACE"
+echo -e "\t Network : $NETWORK"
+echo -e "\t CIDR Masq : $CIDR_MASQ"
+echo -e "\t Number of available IP hosts : $AVAILABLE_HOSTS"
+echo -e "\t First Host IP : $FULL_FIRST_HOST_IP"
+echo -e "\t Last Host IP : $FULL_LAST_HOST_IP"
+echo -e "\t Broadcast IP : $FULL_BROADCAST_IP"
+
+if [ $DEBUG -eq 1 ]; then
+	echo -e "\n** DEBUG MODE ENABLED **"
+		echo -e "\t NETWORK_SEGMENT : $NETWORK_SEGMENT"
+		echo -e "\t HOST_SEGMENT : $HOST_SEGMENT"
+		echo -e "\t AVAILABLE_IPS : $AVAILABLE_IPS"
+		echo -e "\t AVAILABLE_HOSTS : $AVAILABLE_HOSTS" 
+		echo -e "\t FIRST_HOST_IP : $FIRST_HOST_IP"
+		echo -e "\t LAST_HOST_IP : $LAST_HOST_IP"
+		echo -e "\t BROADCAST_IP : $BROADCAST_IP"
+		echo -e "\t FULL_FIRST_HOST_IP : $FULL_FIRST_HOST_IP" 
+		echo -e "\t FULL_LAST_HOST_IP : $FULL_LAST_HOST_IP" 
+		echo -e "\t FULL_BROADCAST_IP : $FULL_BROADCAST_IP"
+		echo -e "\t GATEWAY_IP : $GATEWAY_IP"		
+	echo "** DEBUG MODE **"
+
+else
+	echo -e "------------[ cut here ]------------\n"
+		for (( i=0; i<$AVAILABLE_HOSTS; i++ )); do
+			echo "$IP addr add $NETWORK_SEGMENT.$(($FIRST_HOST_IP+$i))/$CIDR_MASQ dev $INTERFACE broadcast $FULL_BROADCAST_IP"
+		done
+	echo -e "\n------------[ cut above ]------------"
+fi