From 039a985f41f80eaadf4719651f5aa4da2786f2fe Mon Sep 17 00:00:00 2001
From: hakansa <43675540+hakansa@users.noreply.github.com>
Date: Fri, 14 Feb 2025 13:13:40 +0300
Subject: [PATCH] [client] Normalize DNS record names to lowercase in local
 handler update (#3323)

* [client] Normalize DNS record names to lowercase in lookup
---
 client/internal/dns/local.go  | 2 ++
 client/internal/dns/server.go | 1 +
 2 files changed, 3 insertions(+)

diff --git a/client/internal/dns/local.go b/client/internal/dns/local.go
index 1fe88f750..80113885a 100644
--- a/client/internal/dns/local.go
+++ b/client/internal/dns/local.go
@@ -2,6 +2,7 @@ package dns
 
 import (
 	"fmt"
+	"strings"
 	"sync"
 
 	"github.com/miekg/dns"
@@ -60,6 +61,7 @@ func (d *localResolver) ServeDNS(w dns.ResponseWriter, r *dns.Msg) {
 
 func (d *localResolver) lookupRecord(r *dns.Msg) dns.RR {
 	question := r.Question[0]
+	question.Name = strings.ToLower(question.Name)
 	record, found := d.records.Load(buildRecordKey(question.Name, question.Qclass, question.Qtype))
 	if !found {
 		return nil
diff --git a/client/internal/dns/server.go b/client/internal/dns/server.go
index f714f9857..fb94e07ac 100644
--- a/client/internal/dns/server.go
+++ b/client/internal/dns/server.go
@@ -454,6 +454,7 @@ func (s *DefaultServer) buildLocalHandlerUpdate(customZones []nbdns.CustomZone)
 			if record.Class != nbdns.DefaultClass {
 				return nil, nil, fmt.Errorf("received an invalid class type: %s", record.Class)
 			}
+
 			key := buildRecordKey(record.Name, class, uint16(record.Type))
 			localRecords[key] = record
 		}