From 07621a7059f322f58165962a9d4057cd54a0a6c7 Mon Sep 17 00:00:00 2001
From: primal <primal@primal.host>
Date: Mon, 2 Feb 2026 21:02:28 -0500
Subject: [PATCH] Switch back to infra-dns for DNS lookups

infra-dns now configured with Charter DNS servers.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
---
 crawler.go | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/crawler.go b/crawler.go
index 4233537..9ba4274 100644
--- a/crawler.go
+++ b/crawler.go
@@ -145,11 +145,20 @@ func (c *Crawler) StartMaintenanceLoop() {
 	}
 }
 
+// dnsResolver uses local caching DNS (infra-dns)
+var dnsResolver = &net.Resolver{
+	PreferGo: true,
+	Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
+		d := net.Dialer{Timeout: 5 * time.Second}
+		return d.DialContext(ctx, "udp", "infra-dns:53")
+	},
+}
+
 // domainCheck performs a DNS lookup to check if a domain resolves
 func (c *Crawler) domainCheck(host string) error {
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
-	_, err := net.DefaultResolver.LookupHost(ctx, host)
+	_, err := dnsResolver.LookupHost(ctx, host)
 	return err
 }