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{ config, lib, pkgs, ... }:
let
inherit (lib)
maintainers types mkEnableOption mkOption mkIf
literalExpression escapeShellArg escapeShellArgs;
cfg = config.services.mtr-exporter;
in {
options = {
services = {
mtr-exporter = {
enable = mkEnableOption "a Prometheus exporter for MTR";
target = mkOption {
type = types.str;
example = "example.org";
description = "Target to check using MTR.";
};
interval = mkOption {
type = types.int;
default = 60;
description = "Interval between MTR checks in seconds.";
};
port = mkOption {
type = types.port;
default = 8080;
description = "Listen port for MTR exporter.";
};
address = mkOption {
type = types.str;
default = "127.0.0.1";
description = "Listen address for MTR exporter.";
};
mtrFlags = mkOption {
type = with types; listOf str;
default = [];
example = ["-G1"];
description = "Additional flags to pass to MTR.";
};
};
};
};
config = mkIf cfg.enable {
systemd.services.mtr-exporter = {
script = ''
exec ${pkgs.mtr-exporter}/bin/mtr-exporter \
-mtr ${pkgs.mtr}/bin/mtr \
-schedule '@every ${toString cfg.interval}s' \
-bind ${escapeShellArg cfg.address}:${toString cfg.port} \
-- \
${escapeShellArgs (cfg.mtrFlags ++ [ cfg.target ])}
'';
wantedBy = [ "multi-user.target" ];
requires = [ "network.target" ];
after = [ "network.target" ];
serviceConfig = {
Restart = "on-failure";
# Hardening
CapabilityBoundingSet = [ "" ];
DynamicUser = true;
LockPersonality = true;
ProcSubset = "pid";
PrivateDevices = true;
PrivateUsers = true;
PrivateTmp = true;
ProtectClock = true;
ProtectControlGroups = true;
ProtectHome = true;
ProtectHostname = true;
ProtectKernelLogs = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
ProtectProc = "invisible";
ProtectSystem = "strict";
RestrictNamespaces = true;
RestrictRealtime = true;
};
};
};
meta.maintainers = with maintainers; [ jakubgs ];
}
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