mirror of
https://github.com/pivpn/pivpn.git
synced 2024-10-18 05:33:32 +00:00
850e665642
* refactor(core): allow any subnet and netmask * fix(scripts): prevent adding more clients than the subnet allows * fix(scripts): correctly remove leading zeros from ipv6 quartets * refactor(core): new probabilistic subnet generation with fallback to other RFC1918 subnets
54 lines
1.4 KiB
Bash
Executable file
54 lines
1.4 KiB
Bash
Executable file
#!/usr/bin/env bash
|
|
|
|
decIPv4ToDot() {
|
|
local a b c d
|
|
a=$((($1 & 4278190080) >> 24))
|
|
b=$((($1 & 16711680) >> 16))
|
|
c=$((($1 & 65280) >> 8))
|
|
d=$(($1 & 255))
|
|
printf "%s.%s.%s.%s\n" $a $b $c $d
|
|
}
|
|
|
|
dotIPv4ToDec() {
|
|
local original_ifs=$IFS
|
|
IFS='.'
|
|
read -r -a array_ip <<< "$1"
|
|
IFS=$original_ifs
|
|
printf "%s\n" $((array_ip[0] * 16777216 + array_ip[1] * 65536 + array_ip[2] * 256 + array_ip[3]))
|
|
}
|
|
|
|
dotIPv4FirstDec() {
|
|
local decimal_ip decimal_mask
|
|
decimal_ip=$(dotIPv4ToDec "$1")
|
|
decimal_mask=$((2 ** 32 - 1 ^ (2 ** (32 - $2) - 1)))
|
|
printf "%s\n" "$((decimal_ip & decimal_mask))"
|
|
}
|
|
|
|
dotIPv4LastDec() {
|
|
local decimal_ip decimal_mask_inv
|
|
decimal_ip=$(dotIPv4ToDec "$1")
|
|
decimal_mask_inv=$((2 ** (32 - $2) - 1))
|
|
printf "%s\n" "$((decimal_ip | decimal_mask_inv))"
|
|
}
|
|
|
|
decIPv4ToHex() {
|
|
local hex
|
|
hex="$(printf "%08x\n" "$1")"
|
|
quartet_hi=${hex:0:4}
|
|
quartet_lo=${hex:4:4}
|
|
# Removes leading zeros from quartets, purely for aesthetic reasons
|
|
# Source: https://stackoverflow.com/a/19861690
|
|
leading_zeros_hi="${quartet_hi%%[!0]*}"
|
|
leading_zeros_lo="${quartet_lo%%[!0]*}"
|
|
printf "%s:%s\n" "${quartet_hi#"${leading_zeros_hi}"}" "${quartet_lo#"${leading_zeros_lo}"}"
|
|
}
|
|
|
|
cidrToMask() {
|
|
# Source: https://stackoverflow.com/a/20767392
|
|
set -- $((5 - (${1} / 8))) \
|
|
255 255 255 255 \
|
|
$(((255 << (8 - (${1} % 8))) & 255)) \
|
|
0 0 0
|
|
shift "${1}"
|
|
echo "${1-0}.${2-0}.${3-0}.${4-0}"
|
|
}
|