58 lines
1.5 KiB
Nix
58 lines
1.5 KiB
Nix
{
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nftables
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, writeScript
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, lib
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} :
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name : ruleset :
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let
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inherit (lib.strings) concatStringsSep splitString hasInfix substring;
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inherit (lib.lists) groupBy;
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inherit (lib.attrsets) mapAttrsToList nameValuePair;
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inherit (builtins) map listToAttrs replaceStrings head tail;
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indentLines = offset : lines :
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if lines == []
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then ""
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else
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let
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line = head lines;
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isOpen = hasInfix "{" line;
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isClose = hasInfix "}" line;
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offset' = offset +
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(if isOpen then 4 else 0) +
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(if isClose then -4 else 0);
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padding = offset: substring 0 offset " ";
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in
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if (isClose && !isOpen)
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then
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(padding offset') + line + "\n" + indentLines offset' (tail lines)
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else
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(padding offset) + line + "\n" + indentLines offset' (tail lines);
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indent = text : indentLines 0 (splitString "\n" text);
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dochain = { name, type, family, rules, policy ? null, hook ? null } : ''
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chain ${name} {
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${if hook != null
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then "type ${type} hook ${hook}; policy ${policy};"
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else ""
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}
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${concatStringsSep "\n" rules}
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}
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'';
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dotable = family : chains : ''
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table ${family} ${family} {
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${concatStringsSep "\n" (map dochain chains)}
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}
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'';
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categorise = chains :
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groupBy
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({ family, ... } : family)
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(mapAttrsToList (n : v : v // { name = n; }) chains);
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in writeScript name ''
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#!${nftables}/sbin/nft -cf
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flush ruleset
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${indent (concatStringsSep "\n" (mapAttrsToList dotable (categorise ruleset)))}
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''
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