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let inherit (lib) concatStringsSep mkEnableOption mkIf mkOption types ;
cfg = config.services.https-dns-proxy;
providers = { cloudflare = { ips = [ "1.1.1.1" "1.0.0.1" ]; url = "https://cloudflare-dns.com/dns-query"; }; google = { ips = [ "8.8.8.8" "8.8.4.4" ]; url = "https://dns.google/dns-query"; }; quad9 = { ips = [ "9.9.9.9" "149.112.112.112" ]; url = "https://dns.quad9.net/dns-query"; }; opendns = { ips = [ "208.67.222.222" "208.67.220.220" ]; url = "https://doh.opendns.com/dns-query"; }; custom = { inherit (cfg.provider) ips url; }; };
defaultProvider = "quad9";
providerCfg = concatStringsSep " " [ "-b" (concatStringsSep "," providers."${cfg.provider.kind}".ips) "-r" providers."${cfg.provider.kind}".url ];
in{ meta.maintainers = with lib.maintainers; [ peterhoeg ];
###### interface
options.services.https-dns-proxy = { enable = mkEnableOption "https-dns-proxy daemon";
address = mkOption { description = "The address on which to listen"; type = types.str; default = "127.0.0.1"; };
port = mkOption { description = "The port on which to listen"; type = types.port; default = 5053; };
provider = { kind = mkOption { description = '' The upstream provider to use or custom in case you do not trust any of the predefined providers or just want to use your own.
The default is ${defaultProvider} and there are privacy and security trade-offs when using any upstream provider. Please consider that before using any of them.
Supported providers: ${concatStringsSep ", " (builtins.attrNames providers)}
If you pick the custom provider, you will need to provide the bootstrap IP addresses as well as the resolver https URL. ''; type = types.enum (builtins.attrNames providers); default = defaultProvider; };
ips = mkOption { description = "The custom provider IPs"; type = types.listOf types.str; };
url = mkOption { description = "The custom provider URL"; type = types.str; }; };
preferIPv4 = mkOption { description = '' https_dns_proxy will by default use IPv6 and fail if it is not available. To play it safe, we choose IPv4. ''; type = types.bool; default = true; };
extraArgs = mkOption { description = "Additional arguments to pass to the process."; type = types.listOf types.str; default = [ "-v" ]; }; };
###### implementation
config = lib.mkIf cfg.enable { systemd.services.https-dns-proxy = { description = "DNS to DNS over HTTPS (DoH) proxy"; requires = [ "network.target" ]; after = [ "network.target" ]; wants = [ "nss-lookup.target" ]; before = [ "nss-lookup.target" ]; wantedBy = [ "multi-user.target" ]; serviceConfig = { Type = "exec"; DynamicUser = true; ProtectHome = "tmpfs"; ExecStart = lib.concatStringsSep " " ( [ (lib.getExe pkgs.https-dns-proxy) "-a ${toString cfg.address}" "-p ${toString cfg.port}" "-l -" providerCfg ] ++ lib.optional cfg.preferIPv4 "-4" ++ cfg.extraArgs ); Restart = "on-failure"; }; }; };}