132 lines
3.1 KiB
Bash
132 lines
3.1 KiB
Bash
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#!/bin/bash
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##################################################################################
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#
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# Copyright (C) 2017 Craig Miller
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#
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# See the file "LICENSE" for information on usage and redistribution
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# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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# Distributed under GPLv2 License
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#
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##################################################################################
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# IPv6 Address Expansion functions
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#
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# by Craig Miller 19 Feb 2017
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#
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# 16 Nov 2017 v0.93 - added CLI functionality
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VERSION=0.93
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empty_addr="0000:0000:0000:0000:0000:0000:0000:0000"
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empty_addr_len=${#empty_addr}
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function usage {
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echo " $0 - expand compressed IPv6 addresss "
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echo " e.g. $0 2001:db8:1:12:123::456 "
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echo " "
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echo " -t self test"
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echo " "
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echo " By Craig Miller - Version: $VERSION"
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exit 1
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}
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if [ "$1" == "-h" ]; then
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#call help
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usage
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fi
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#
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# Expands IPv6 quibble to 4 digits with leading zeros e.g. db8 -> 0db8
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#
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# Returns string with expanded quibble
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function expand_quibble() {
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addr=$1
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# create array of quibbles
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addr_array=(${addr//:/ })
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addr_array_len=${#addr_array[@]}
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# step thru quibbles
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for ((i=0; i< $addr_array_len ; i++ ))
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do
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quibble=${addr_array[$i]}
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quibble_len=${#quibble}
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case $quibble_len in
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1) quibble="000$quibble";;
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2) quibble="00$quibble";;
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3) quibble="0$quibble";;
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esac
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addr_array[$i]=$quibble
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done
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# reconstruct addr from quibbles
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return_str=${addr_array[*]}
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return_str="${return_str// /:}"
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echo $return_str
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}
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#
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# Expands IPv6 address :: format to full zeros
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#
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# Returns string with expanded address
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function expand() {
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if [[ $1 == *"::"* ]]; then
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# check for leading zeros on front_addr
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if [[ $1 == "::"* ]]; then
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front_addr=0
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else
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front_addr=$(echo $1 | sed -r 's;([^ ]+)::.*;\1;')
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fi
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# check for trailing zeros on back_addr
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if [[ $1 == *"::" ]]; then
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back_addr=0
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else
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back_addr=$(echo $1 | sed -r 's;.*::([^ ]+);\1;')
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fi
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front_addr=$(expand_quibble $front_addr)
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back_addr=$(expand_quibble $back_addr)
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new_addr=$empty_addr
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front_addr_len=${#front_addr}
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back_addr_len=${#back_addr}
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# calculate fill needed
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num_zeros=$(($empty_addr_len - $front_addr_len - $back_addr_len - 1))
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#fill_str=${empty_addr[0]:0:$num_zeros}
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new_addr="$front_addr:${empty_addr[0]:0:$num_zeros}$back_addr"
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# return expanded address
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echo $new_addr
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else
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# return input with expandd quibbles
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expand_quibble $1
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fi
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}
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# self test - call with '-t' parameter
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if [ "$1" == "-t" ]; then
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# add address examples to test
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expand fd11::1d70:cf84:18ef:d056
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expand 2a01::1
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expand fe80::f203:8cff:fe3f:f041
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expand 2001:db8:123::5
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expand 2001:470:ebbd:0:f203:8cff:fe3f:f041
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# special cases
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expand ::1
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expand fd32:197d:3022:1101::
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exit 1
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fi
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# allow script to be sourced (with no arguements)
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if [[ $1 != "" ]]; then
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# validate input is an IPv6 address
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if [[ $1 == *":"* ]]; then
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expand $1
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else
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echo "ERROR: unregcognized IPv6 address $1"
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exit 1
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fi
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fi
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