Initial commit

snippets/read_ipv4_from_file.sh

@@ -0,0 +1,158 @@
+#!/usr/bin/env bash
+
+ipv4_list_file="files/ban_ipv4.list"
+
+if [[ ! -f "$ipv4_list_file" ]] ; then
+   echo ""
+   echo "   File '$ipv4_list_file' not found'"
+   echo ""
+   exit 0
+fi
+
+declare -a octets
+declare -i index
+
+while IFS='' read -r _line || [[ -n $_line ]] ; do
+
+	is_valid_ipv4=true
+	is_valid_mask=true
+	ipv4=""
+   mask=""
+	
+   # Ignore comment lines
+	#
+   [[ $_line =~ ^[[:space:]]{0,}# ]] && continue
+
+	# Ignore blank lines
+	#
+	[[ $_line =~ ^[[:space:]]*$ ]] && continue
+
+	# Remove leading whitespace characters
+	#
+	_line="${_line#"${_line%%[![:space:]]*}"}"
+
+
+	# Catch IPv4 Address
+   #
+	given_ipv4="$(echo  $_line | cut -d ' ' -f1)"
+
+
+	# Splitt Ipv4 address from possible given CIDR number
+   #
+	IFS='/' read -ra _addr <<< "$given_ipv4"
+	_ipv4="${_addr[0]}"
+
+	if [[ -n "${_addr[1]}" ]] ; then
+		_mask="${_addr[1]}"
+      test_netmask=false
+
+      # Is 'mask' a valid CIDR number? If not, test agains a valid netmask
+      #
+      if $(test -z "${_mask##*[!0-9]*}" > /dev/null 2>&1) ; then
+
+         # Its not a vaild mask number, but naybe a valit netmask.
+         # 
+         test_netmask=true
+      else
+         if [[ $_mask -gt 32 ]]; then
+
+            # Its not a vaild cidr number, but naybe a valit netmask.
+            # 
+            test_netmask=true
+         else
+
+            # OK, we have a vaild cidr number between '0' and '32'
+            #
+            mask=$_mask
+         fi
+      fi
+
+      # Test if given '_mask' is a valid netmask.
+      #
+      if $test_netmask ; then
+         octets=( ${_mask//\./ } )
+
+         # Complete netmask if necessary
+         #
+         while [[ ${#octets[@]} -lt 4 ]]; do
+            octets+=(0)
+         done
+
+         [[ ${#octets[@]} -gt 4 ]] && is_valid_mask=false
+
+         index=0
+         for octet in ${octets[@]} ; do
+            if [[ ${octet} =~ ^[0-9]{1,3}$ ]] ; then
+               if [[ $octet -gt 255 ]] ; then
+                  is_valid_mask=false
+               fi
+               if [[ $index -gt 0 ]] ; then
+                  mask="${mask}.${octet}"
+               else
+                  mask="${octet}"
+               fi
+               
+            else
+               is_valid_mask=false
+            fi
+
+            ((index++))
+         done
+      fi
+
+		adjust_mask=false
+	else
+      mask=32
+		adjust_mask=true
+	fi
+
+	# Splitt given address into their octets
+   #
+	octets=( ${_ipv4//\./ } )
+
+	# Complete IPv4 address if necessary
+   #
+	while [[ ${#octets[@]} -lt 4 ]]; do
+		octets+=(0)
+
+		# Only adjust CIDR number if not given
+      #
+		if $adjust_mask ; then
+			mask="$(expr $mask - 8)"
+		fi
+	done
+
+	# Pre-check if given IPv4 Address seems to be a valid address
+   #
+	[[ ${#octets[@]} -gt 4 ]] && is_valid_ipv4=false
+
+	# Check if given IPv4 Address is a valid address
+   #
+	if $is_valid_ipv4 ; then
+		index=0
+		for octet in ${octets[@]} ; do
+			if [[ ${octet} =~ ^[0-9]{1,3}$ ]] ; then
+				if [[ $octet -gt 255 ]] ; then
+					is_valid_ipv4=false
+				fi
+				if [[ $index -gt 0 ]] ; then
+					ipv4="${ipv4}.${octet}"
+				else
+					ipv4="${octet}"
+				fi
+				
+			else
+				is_valid_ipv4=false
+			fi
+
+			((index++))
+		done
+	fi
+
+	if $is_valid_ipv4 && $is_valid_mask; then
+   	echo "   ${ipv4}/${mask}"
+	else
+		echo "   '$given_ipv4' isn't a valid IPv4 address"
+	fi
+
+done < ban_ipv4.list