From d4ff81a5e454bdbe0346beb9d09f9055dd2f07ed Mon Sep 17 00:00:00 2001
From: Shulhan <ms@kilabit.info>
Date: Mon, 26 Jan 2026 16:33:55 +0700
Subject: lib/dns: add method to set TTL on Message

The SetTTL method set all RRs answer time to live.
---
 CHANGELOG.adoc     |  4 ++++
 lib/dns/message.go | 16 ++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
index 6d647edf..41141827 100644
--- a/CHANGELOG.adoc
+++ b/CHANGELOG.adoc
@@ -38,6 +38,10 @@ Legend,
 [#v0_61_0]
 == pakakeh.go v0.61.0 (2026-xx-xx)
 
+**🌼 lib/dns: add method to set TTL on Message**
+
+The SetTTL method set all RRs answer time to live.
+
 **lib/dns: print the answer TTL in DebugLevelCache**
 
 The log level cache changed to the following format,
diff --git a/lib/dns/message.go b/lib/dns/message.go
index abef69cd..8a5e2f05 100644
--- a/lib/dns/message.go
+++ b/lib/dns/message.go
@@ -996,6 +996,22 @@ func (msg *Message) SetResponseCode(code ResponseCode) {
 	}
 }
 
+// SetTTL set all RRs answer and authority time-to-live (TTL) to `n`.
+func (msg *Message) SetTTL(n uint32) {
+	for x := range len(msg.Answer) {
+		msg.Answer[x].TTL = n
+		binary.BigEndian.PutUint32(
+			msg.packet[msg.Answer[x].idxTTL:],
+			msg.Answer[x].TTL)
+	}
+	for x := range len(msg.Authority) {
+		msg.Authority[x].TTL = n
+		binary.BigEndian.PutUint32(
+			msg.packet[msg.Authority[x].idxTTL:],
+			msg.Authority[x].TTL)
+	}
+}
+
 // SubTTL subtract TTL in each resource records and in packet by n seconds.
 // If TTL is less than n, it will set to 0.
 func (msg *Message) SubTTL(n uint32) {
-- 
cgit v1.3