dotfiles/nixos/services/transmission.nix

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{ config, pkgs, lib, ... }: {
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options = {
transmissionServer = lib.mkOption {
type = lib.types.str;
description = "Hostname for Transmission";
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default = null;
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};
};
config = let
namespace = config.networking.wireguard.interfaces.wg0.interfaceNamespace;
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vpnIp = lib.strings.removeSuffix "/32"
(builtins.head config.networking.wireguard.interfaces.wg0.ips);
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in lib.mkIf (config.wireguard.enable && config.transmissionServer != null) {
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# Setup transmission
services.transmission = {
enable = true;
settings = {
port-forwarding-enabled = false;
rpc-authentication-required = true;
rpc-port = 9091;
rpc-bind-address = "0.0.0.0";
rpc-username = config.user;
rpc-host-whitelist = config.transmissionServer;
rpc-host-whitelist-enabled = true;
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rpc-whitelist = "127.0.0.1,${vpnIp}";
rpc-whitelist-enabled = true;
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};
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credentialsFile = config.secrets.transmission.dest;
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};
# Bind transmission to wireguard namespace
systemd.services.transmission = {
bindsTo = [ "netns@${namespace}.service" ];
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requires = [ "network-online.target" "transmission-secret.service" ];
after = [ "wireguard-wg0.service" "transmission-secret.service" ];
unitConfig.JoinsNamespaceOf = "netns@${namespace}.service";
serviceConfig.NetworkNamespacePath = "/var/run/netns/${namespace}";
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};
# Create reverse proxy for web UI
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caddy.routes = [{
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match = [{ host = [ config.transmissionServer ]; }];
handle = [{
handler = "reverse_proxy";
upstreams = [{ dial = "localhost:9091"; }];
}];
}];
# Caddy and Transmission both try to set rmem_max for larger UDP packets.
# We will choose Transmission's recommendation (4 MB).
boot.kernel.sysctl."net.core.rmem_max" = 4194304;
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# Allow inbound connections to reach namespace
systemd.services.transmission-web-netns = {
description = "Forward to transmission in wireguard namespace";
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requires = [ "transmission.service" ];
after = [ "transmission.service" ];
serviceConfig = {
Restart = "on-failure";
TimeoutStopSec = 300;
};
wantedBy = [ "multi-user.target" ];
script = ''
${pkgs.iproute2}/bin/ip netns exec ${namespace} ${pkgs.iproute2}/bin/ip link set dev lo up
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${pkgs.socat}/bin/socat tcp-listen:9091,fork,reuseaddr exec:'${pkgs.iproute2}/bin/ip netns exec ${namespace} ${pkgs.socat}/bin/socat STDIO "tcp-connect:${vpnIp}:9091"',nofork
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'';
};
# Create credentials file for transmission
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secrets.transmission = {
source = ../../private/transmission.json.age;
dest = "${config.secretsDirectory}/transmission.json";
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owner = "transmission";
group = "transmission";
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};
};
}