1 files changed, 153 insertions, 0 deletions
diff --git a/netwerk/test/unit/test_trr_case_sensitivity.js b/netwerk/test/unit/test_trr_case_sensitivity.js
new file mode 100644
index 0000000000..c2c9572fac
--- /dev/null
+++ b/netwerk/test/unit/test_trr_case_sensitivity.js
@@ -0,0 +1,153 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+trr_test_setup();
+registerCleanupFunction(async () => {
+  trr_clear_prefs();
+});
+
+function makeChan(url) {
+  let chan = NetUtil.newChannel({
+    uri: url,
+    loadUsingSystemPrincipal: true,
+  }).QueryInterface(Ci.nsIHttpChannel);
+  return chan;
+}
+
+function channelOpenPromise(chan) {
+  return new Promise(resolve => {
+    function finish(req, buffer) {
+      resolve([req, buffer]);
+    }
+    chan.asyncOpen(new ChannelListener(finish));
+  });
+}
+
+add_task(async function test_trr_casing() {
+  let trrServer = new TRRServer();
+  registerCleanupFunction(async () => {
+    await trrServer.stop();
+  });
+  await trrServer.start();
+  dump(`port = ${trrServer.port}\n`);
+  let chan = makeChan(`https://localhost:${trrServer.port}/test?bla=some`);
+  let [, resp] = await channelOpenPromise(chan);
+  equal(resp, "<h1> 404 Path not found: /test?bla=some</h1>");
+
+  Services.dns.clearCache(true);
+  Services.prefs.setIntPref("network.trr.mode", 3);
+  Services.prefs.setCharPref(
+    "network.trr.uri",
+    `https://foo.example.com:${trrServer.port}/dns-query`
+  );
+
+  // This CNAME response goes to B.example.com (uppercased)
+  // It should be lowercased by the code
+  await trrServer.registerDoHAnswers("a.example.com", "A", {
+    answers: [
+      {
+        name: "a.example.com",
+        ttl: 55,
+        type: "CNAME",
+        flush: false,
+        data: "B.example.com",
+      },
+    ],
+  });
+  // Like in bug 1635566, the response for B.example.com will be lowercased
+  // by the server too -> b.example.com
+  // Requesting this resource would case the browser to reject the resource
+  await trrServer.registerDoHAnswers("B.example.com", "A", {
+    answers: [
+      {
+        name: "b.example.com",
+        ttl: 55,
+        type: "CNAME",
+        flush: false,
+        data: "c.example.com",
+      },
+    ],
+  });
+
+  // The browser should request this one
+  await trrServer.registerDoHAnswers("b.example.com", "A", {
+    answers: [
+      {
+        name: "b.example.com",
+        ttl: 55,
+        type: "CNAME",
+        flush: false,
+        data: "c.example.com",
+      },
+    ],
+  });
+  // Finally, it gets an IP
+  await trrServer.registerDoHAnswers("c.example.com", "A", {
+    answers: [
+      {
+        name: "c.example.com",
+        ttl: 55,
+        type: "A",
+        flush: false,
+        data: "1.2.3.4",
+      },
+    ],
+  });
+  await new TRRDNSListener("a.example.com", { expectedAnswer: "1.2.3.4" });
+
+  await trrServer.registerDoHAnswers("a.test.com", "A", {
+    answers: [
+      {
+        name: "a.test.com",
+        ttl: 55,
+        type: "CNAME",
+        flush: false,
+        data: "B.test.com",
+      },
+    ],
+  });
+  // We try this again, this time we explicitly make sure this resource
+  // is never used
+  await trrServer.registerDoHAnswers("B.test.com", "A", {
+    answers: [
+      {
+        name: "B.test.com",
+        ttl: 55,
+        type: "A",
+        flush: false,
+        data: "9.9.9.9",
+      },
+    ],
+  });
+  await trrServer.registerDoHAnswers("b.test.com", "A", {
+    answers: [
+      {
+        name: "b.test.com",
+        ttl: 55,
+        type: "A",
+        flush: false,
+        data: "8.8.8.8",
+      },
+    ],
+  });
+  await new TRRDNSListener("a.test.com", { expectedAnswer: "8.8.8.8" });
+
+  await trrServer.registerDoHAnswers("CAPITAL.COM", "A", {
+    answers: [
+      {
+        name: "capital.com",
+        ttl: 55,
+        type: "A",
+        flush: false,
+        data: "2.2.2.2",
+      },
+    ],
+  });
+  await new TRRDNSListener("CAPITAL.COM", { expectedAnswer: "2.2.2.2" });
+  await new TRRDNSListener("CAPITAL.COM.", { expectedAnswer: "2.2.2.2" });
+
+  await trrServer.stop();
+});