eculocate

commit 39df2730b9f0640bbb86a37819a67397fdaba02d
parent 97526702a8b41056a7fad5e55a19b7ea34113f5c
Author: Daniel Barlow <dan@telent.net>
Date:   Tue, 30 Dec 2025 15:32:45 +0000

send cache-flush when appropriate

Diffstat:
M
ecu-esp32/src/wifi.rs
 | 
18
+++++++++++++++++-

1 file changed, 17 insertions(+), 1 deletion(-)
diff --git a/ecu-esp32/src/wifi.rs b/ecu-esp32/src/wifi.rs
@@ -316,6 +316,22 @@ impl DnsResource {
 	}
     }
 
+    // Should we send cache-flush with this record? If it's "unique",
+    // which means "all the records with that name, rrtype, and
+    // rrclass are conceptually under the control or ownership of a
+    // single responder". This works out (perhaps by coincidence) to
+    // be everything except the PTR records
+    fn is_unique(&self) -> bool {
+	self.data.ty() != ResourceType::Ptr
+    }
+    fn class(&self) -> u16 {
+	if self.is_unique() {
+	    1 | CACHE_FLUSH
+	} else {
+	    1
+	}
+    }
+
     fn to_resource_record(&self) -> ResourceRecord<'_> {
 	let ttl = match self.data.ty() {
 	    ResourceType::A => 120,
@@ -326,7 +342,7 @@ impl DnsResource {
 	ResourceRecord::new(
 	    &self.name[..],
 	    self.data.ty(),
-	    1,
+	    self.class(),
 	    ttl,
 	    &self.data_raw[..]
 	)