57 lines
1.9 KiB
Nix
57 lines
1.9 KiB
Nix
{ lib }:
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with lib;
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let
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joinString = lib.concatStringsSep;
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pow = x: e: if (e == 0) then 1 else x * (pow x (e - 1));
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in rec {
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generateNBits = n: let
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helper = n: c: if (c == n) then pow 2 c else (pow 2 c) + (helper n (c + 1));
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in if (n <= 0) then throw "Can't generate 0 or fewer bits" else helper (n - 1) 0;
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reverseIpv4 = ip: joinString "." (reverseList (splitString "." ip));
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intToBinaryList = int: let
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helper = int: cur: let
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curExp = pow 2 cur;
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in if (curExp > int) then
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[]
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else
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[(if ((bitAnd curExp int) > 0) then 1 else 0)] ++ (helper int (cur + 1));
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in reverseList (helper int 0);
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leftShift = int: n: int * (pow 2 n);
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rightShift = int: n: int / (pow 2 n);
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ipv4ToInt = ip: let
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els = map toInt (reverseList (splitString "." ip));
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in foldr (a: b: a + b) 0 (imap0 (i: el: (leftShift el (i * 8))) els);
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intToIpv4 = int: joinString "." (map (i: toString (bitAnd (rightShift int (i * 8)) 255)) [ 3 2 1 0 ]);
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rightPadBits = int: bits: bitOr int (generateNBits bits);
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maskFromV32Network = network: let
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fullMask = ipv4ToInt "255.255.255.255";
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insignificantBits = 32 - (getNetworkMask network);
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in intToIpv4 (leftShift (rightShift fullMask insignificantBits) insignificantBits);
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getNetworkMask = network: toInt (elemAt (splitString "/" network) 1);
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getNetworkBase = network: let
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ip = elemAt (splitString "/" network) 0;
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insignificantBits = 32 - (getNetworkMask network);
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in intToIpv4 (leftShift (rightShift (ipv4ToInt ip) insignificantBits) insignificantBits);
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networkMinIp = network: intToIpv4 (1 + (ipv4ToInt (getNetworkBase network)));
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networkMaxIp = network: intToIpv4 (rightPadBits (ipv4ToInt (getNetworkBase network)) (32 - (getNetworkMask network)));
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# To avoid broadcast IP...
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networkMaxButOneIp = network: intToIpv4 ((rightPadBits (ipv4ToInt (getNetworkBase network)) (32 - (getNetworkMask network))) - 1);
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}
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