From 52a0d3845ead07f840e9e99cb4a8c3507c84ab30 Mon Sep 17 00:00:00 2001
From: radhitya <alif@radhitya.org>
Date: Sat, 4 Jul 2026 14:29:02 +0700
Subject: fiuh

---
 internal/dns/fuzz_test.go | 52 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 internal/dns/fuzz_test.go

(limited to 'internal/dns/fuzz_test.go')

diff --git a/internal/dns/fuzz_test.go b/internal/dns/fuzz_test.go
new file mode 100644
index 0000000..8aa1653
--- /dev/null
+++ b/internal/dns/fuzz_test.go
@@ -0,0 +1,52 @@
+package dns
+
+import (
+	"testing"
+)
+
+func FuzzUnpack(f *testing.F) {
+	seed := []byte{
+		0x00, 0x01, // ID
+		0x01, 0x00, // flags: RD=1
+		0x00, 0x01, // QDCOUNT = 1
+		0x00, 0x00, // ANCOUNT = 0
+		0x00, 0x00, // NSCOUNT = 0
+		0x00, 0x00, // ARCOUNT = 0
+		0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e',
+		0x03, 'c', 'o', 'm',
+		0x00,       // root label
+		0x00, 0x01, // QTYPE = A
+		0x00, 0x01, // QCLASS = IN
+	}
+	f.Add(seed)
+
+	seedResp := []byte{
+		0x00, 0x01, // ID
+		0x85, 0x80, // flags: QR=1, AA=1, RD=1, RA=1
+		0x00, 0x01, // QDCOUNT = 1
+		0x00, 0x01, // ANCOUNT = 1
+		0x00, 0x00, // NSCOUNT = 0
+		0x00, 0x00, // ARCOUNT = 0
+		0x03, 'w', 'w', 'w',
+		0x07, 'e', 'x', 'a', 'm', 'p', 'l', 'e',
+		0x03, 'c', 'o', 'm',
+		0x00,
+		0x00, 0x01, // TYPE = A
+		0x00, 0x01, // CLASS = IN
+		0x00, 0x00, 0x00, 0x3C, // TTL = 60
+		0x00, 0x04, // RDLENGTH = 4
+		0x01, 0x02, 0x03, 0x04, // 1.2.3.4
+	}
+	f.Add(seedResp)
+
+	f.Fuzz(func(t *testing.T, data []byte) {
+		m, err := Unpack(data)
+		if err != nil {
+			return // error is fine; panic is not
+		}
+		_, err = Pack(m)
+		if err != nil {
+			t.Errorf("Pack after Unpack: %v", err)
+		}
+	})
+}
-- 
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