resolver: test DO bit handling

this corresponds to section 3.2.1 of RFC4035

packages/conformance-tests/src/resolver/dnssec/rfc4035/section_3.rs

@@ -1 +1,2 @@
 mod section_3_1;
+mod section_3_2;

packages/conformance-tests/src/resolver/dnssec/rfc4035/section_3/section_3_2.rs

@@ -0,0 +1,126 @@
+use dns_test::{
+    client::{Client, DigSettings},
+    name_server::NameServer,
+    record::{Record, RecordType},
+    tshark::{Capture, Direction},
+    zone_file::Root,
+    Network, Resolver, Result, FQDN,
+};
+
+#[test]
+#[ignore]
+fn do_bit_not_set_in_request() -> Result<()> {
+    let network = &Network::new()?;
+    let ns = NameServer::new(&dns_test::PEER, FQDN::ROOT, network)?
+        .sign()?
+        .start()?;
+    let resolver = Resolver::new(network, Root::new(ns.fqdn().clone(), ns.ipv4_addr()))
+        .start(&dns_test::SUBJECT)?;
+
+    let mut tshark = resolver.eavesdrop()?;
+
+    let client = Client::new(network)?;
+    let settings = *DigSettings::default().recurse();
+    let ans = client.dig(settings, resolver.ipv4_addr(), RecordType::SOA, &FQDN::ROOT)?;
+
+    // "the name server side MUST strip any authenticating DNSSEC RRs from the response"
+    let [answer] = ans.answer.try_into().unwrap();
+
+    assert!(matches!(answer, Record::SOA(_)));
+
+    tshark.wait_for_capture()?;
+
+    let captures = tshark.terminate()?;
+
+    let ns_addr = ns.ipv4_addr();
+    for Capture { message, direction } in captures {
+        if let Direction::Outgoing { destination } = direction {
+            if destination == client.ipv4_addr() {
+                continue;
+            }
+
+            // sanity check
+            assert_eq!(ns_addr, destination);
+
+            //  "The resolver side of a security-aware recursive name server MUST set the DO bit
+            //  when sending requests"
+            if destination == ns_addr {
+                assert_eq!(Some(true), message.is_do_bit_set());
+            }
+        }
+    }
+
+    Ok(())
+}
+
+#[test]
+fn if_do_bit_not_set_in_request_then_requested_dnssec_record_is_not_stripped() -> Result<()> {
+    let network = &Network::new()?;
+    let ns = NameServer::new(&dns_test::PEER, FQDN::ROOT, network)?
+        .sign()?
+        .start()?;
+    let resolver = Resolver::new(network, Root::new(ns.fqdn().clone(), ns.ipv4_addr()))
+        .start(&dns_test::SUBJECT)?;
+
+    let client = Client::new(network)?;
+    let settings = *DigSettings::default().recurse();
+    let ans = client.dig(
+        settings,
+        resolver.ipv4_addr(),
+        RecordType::DNSKEY,
+        &FQDN::ROOT,
+    )?;
+
+    // "MUST NOT strip any DNSSEC RR types that the initiating query explicitly requested"
+    for record in &ans.answer {
+        assert!(matches!(record, Record::DNSKEY(_)))
+    }
+
+    Ok(())
+}
+
+#[test]
+#[ignore]
+fn do_bit_set_in_request() -> Result<()> {
+    let network = &Network::new()?;
+    let ns = NameServer::new(&dns_test::PEER, FQDN::ROOT, network)?
+        .sign()?
+        .start()?;
+    let resolver = Resolver::new(network, Root::new(ns.fqdn().clone(), ns.ipv4_addr()))
+        .start(&dns_test::SUBJECT)?;
+
+    let mut tshark = resolver.eavesdrop()?;
+
+    let client = Client::new(network)?;
+    let settings = *DigSettings::default().dnssec().recurse();
+    let ans = client.dig(settings, resolver.ipv4_addr(), RecordType::SOA, &FQDN::ROOT)?;
+
+    let [answer, rrsig] = ans.answer.try_into().unwrap();
+
+    assert!(matches!(answer, Record::SOA(_)));
+    assert!(matches!(rrsig, Record::RRSIG(_)));
+
+    tshark.wait_for_capture()?;
+
+    let captures = tshark.terminate()?;
+
+    let ns_addr = ns.ipv4_addr();
+    for Capture { message, direction } in captures {
+        if let Direction::Outgoing { destination } = direction {
+            if destination == client.ipv4_addr() {
+                continue;
+            }
+
+            // sanity check
+            assert_eq!(ns_addr, destination);
+
+            //  "The resolver side of a security-aware recursive name server MUST set the DO bit
+            //  when sending requests"
+            if destination == ns_addr {
+                assert_eq!(Some(true), message.is_do_bit_set());
+            }
+        }
+    }
+
+    Ok(())
+}