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https://github.com/pivpn/pivpn.git
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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
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decIPv4ToDot() {
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local a b c d
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a=$((($1 & 4278190080) >> 24))
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b=$((($1 & 16711680) >> 16))
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c=$((($1 & 65280) >> 8))
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d=$(($1 & 255))
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printf "%s.%s.%s.%s\n" $a $b $c $d
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}
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dotIPv4ToDec() {
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local original_ifs=$IFS
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IFS='.'
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read -r -a array_ip <<< "$1"
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IFS=$original_ifs
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printf "%s\n" $((array_ip[0] * 16777216 + array_ip[1] * 65536 + array_ip[2] * 256 + array_ip[3]))
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}
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dotIPv4FirstDec() {
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local decimal_ip decimal_mask
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decimal_ip=$(dotIPv4ToDec "$1")
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decimal_mask=$((2 ** 32 - 1 ^ (2 ** (32 - $2) - 1)))
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printf "%s\n" "$((decimal_ip & decimal_mask))"
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}
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dotIPv4LastDec() {
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local decimal_ip decimal_mask_inv
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decimal_ip=$(dotIPv4ToDec "$1")
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decimal_mask_inv=$((2 ** (32 - $2) - 1))
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printf "%s\n" "$((decimal_ip | decimal_mask_inv))"
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}
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decIPv4ToHex() {
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local hex
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hex="$(printf "%08x\n" "$1")"
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quartet_hi=${hex:0:4}
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quartet_lo=${hex:4:4}
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# Removes leading zeros from quartets, purely for aesthetic reasons
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# Source: https://stackoverflow.com/a/19861690
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leading_zeros_hi="${quartet_hi%%[!0]*}"
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leading_zeros_lo="${quartet_lo%%[!0]*}"
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printf "%s:%s\n" "${quartet_hi#"${leading_zeros_hi}"}" "${quartet_lo#"${leading_zeros_lo}"}"
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}
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cidrToMask() {
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# Source: https://stackoverflow.com/a/20767392
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set -- $((5 - (${1} / 8))) \
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255 255 255 255 \
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$(((255 << (8 - (${1} % 8))) & 255)) \
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0 0 0
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shift "${1}"
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echo "${1-0}.${2-0}.${3-0}.${4-0}"
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}
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