34 lines
592 B
Nix
34 lines
592 B
Nix
let
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pow2 = n:
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if n <= 0
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then 1
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else 2 * (pow2 (n - 1));
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octet = n:
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if n == 0
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then 0
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else (pow2 (8 - n)) + (octet (n - 1));
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netmask = len:
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builtins.concatStringsSep "." (
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map (byte:
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toString (
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if 8 * (byte + 1) <= len
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then 255
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else if 8 * byte <= len
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then octet (len - (8 * byte))
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else 0
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)
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) [0 1 2 3]
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);
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keys = n:
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if n < 33
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then [n] ++ keys (n + 1)
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else [];
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in
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builtins.foldl' (netmasks: n:
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netmasks // {
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"${toString n}" = netmask n;
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}
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) {} (keys 0)
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