From cfc0d34a584254a9ed76620951c810771aff6f3b Mon Sep 17 00:00:00 2001
From: Alexander Hunt <me@liz.coffee>
Date: Sun, 21 Jun 2026 12:43:31 -0700
Subject: STUFF

---
 args/args.go | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

(limited to 'args')

diff --git a/args/args.go b/args/args.go
index 6655f4a..6c79fe9 100644
--- a/args/args.go
+++ b/args/args.go
@@ -3,6 +3,7 @@ package args
 import (
 	"flag"
 	"os"
+	"strings"
 )
 
 type Arguments struct {
@@ -16,6 +17,17 @@ type Arguments struct {
 	Port   int
 	Server bool
 
+	// Dns runs the authoritative DNS server for the LAN. DnsZone is the suffix
+	// it owns (e.g. penguins.lan); queries outside it are forwarded to
+	// DnsResolvers (empty = no forwarding, since the LAN has no outside
+	// internet). ServerIP (env SERVER_IP) answers the zone apex so the website
+	// itself resolves; empty leaves the apex unanswered.
+	Dns          bool
+	DnsPort      int
+	DnsResolvers []string
+	DnsZone      string
+	ServerIP     string
+
 	// DevMAC (env DEV_MAC) forces every client's MAC, for testing auth from
 	// loopback where the browser never appears in the ARP table.
 	DevMAC string
@@ -40,8 +52,20 @@ func GetArgs() (*Arguments, error) {
 	port := flag.Int("port", 8080, "Port to listen on")
 	server := flag.Bool("server", false, "Run the HTTP server")
 
+	dns := flag.Bool("dns", false, "Run the authoritative DNS server")
+	dnsPort := flag.Int("dns-port", 8053, "Port for the DNS server to listen on")
+	dnsZone := flag.String("dns-zone", "penguins.lan", "DNS zone this server is authoritative for")
+	dnsResolvers := flag.String("dns-resolvers", "", "Comma-separated upstream resolvers for non-zone queries (empty disables forwarding)")
+
 	flag.Parse()
 
+	resolvers := []string{}
+	for _, r := range strings.Split(*dnsResolvers, ",") {
+		if r = strings.TrimSpace(r); r != "" {
+			resolvers = append(resolvers, r)
+		}
+	}
+
 	return &Arguments{
 		DatabasePath: *databasePath,
 		TemplatePath: *templatePath,
@@ -50,6 +74,11 @@ func GetArgs() (*Arguments, error) {
 		Scheduler:    *scheduler,
 		Port:         *port,
 		Server:       *server,
+		Dns:          *dns,
+		DnsPort:      *dnsPort,
+		DnsResolvers: resolvers,
+		DnsZone:      *dnsZone,
+		ServerIP:     os.Getenv("SERVER_IP"),
 		DevMAC:       os.Getenv("DEV_MAC"),
 		RconAddress:  os.Getenv("RCON_ADDRESS"),
 		RconPassword: os.Getenv("RCON_PASSWORD"),
-- 
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