45 lines
1.1 KiB
Bash
45 lines
1.1 KiB
Bash
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#!/usr/bin/env bash
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source config
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check_root() {
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if [ "$EUID" -ne 0 ]; then
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printf %b\\n "] Please run the script as root."
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exit 1
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fi
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}
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gen_cidr() {
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base=${1%/*}
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masksize=${1#*/}
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[ $masksize -lt 8 ] && { echo "] Max range is /8."; exit 1;}
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mask=$(( 0xFFFFFFFF << (32 - $masksize) ))
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IFS=. read a b c d <<< $base
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ip=$(( ($b << 16) + ($c << 8) + $d ))
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ipstart=$(( $ip & $mask ))
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ipend=$(( ($ipstart | ~$mask ) & 0x7FFFFFFF ))
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seq $ipstart $ipend | while read i; do
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echo $a.$(( ($i & 0xFF0000) >> 16 )).$(( ($i & 0xFF00) >> 8 )).$(( $i & 0x00FF ))
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done
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}
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check_root
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# This generates all host address for our vpn subnet but skips the following:
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# - vpn server address, which ends with .0.1
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# - the network address and the broadcast address
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# - all host addresses in between that looks like /24 net and mask, they should work but they are
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# misleading in that regard, and we do have enough addresses already
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if [ -f $ip_db ]; then
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echo "] IP pool exists at $ip_db. Remove it first."
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exit 1
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else
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gen_cidr 10.${net_prefix}.0.0/20 | grep -v \\.0$ | grep -v .255$ | grep -v \\.0\\.1$ > $ip_db
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fi
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