Bug 1625213 - Add simple e10s ESNI test r=dragana

It seems there was no unit test exercising this code in e10s.
This copies the simple test from test_esni_dns_fetch.js to make sure
we have a little code coverage for the IPC code too.

Differential Revision: https://phabricator.services.mozilla.com/D69327

--HG--
extra : moz-landing-system : lando

netwerk/test/unit_ipc/child_esni_dns_fetch1.js

@@ -0,0 +1,61 @@
+"use strict";
+
+const dns = Cc["@mozilla.org/network/dns-service;1"].getService(
+  Ci.nsIDNSService
+);
+const threadManager = Cc["@mozilla.org/thread-manager;1"].getService(
+  Ci.nsIThreadManager
+);
+const mainThread = threadManager.currentThread;
+
+const defaultOriginAttributes = {};
+
+let test_answer = "bXkgdm9pY2UgaXMgbXkgcGFzc3dvcmQ=";
+let test_answer_addr = "127.0.0.1";
+
+class DNSListener {
+  constructor() {
+    this.promise = new Promise(resolve => {
+      this.resolve = resolve;
+    });
+  }
+  onLookupComplete(inRequest, inRecord, inStatus) {
+    let txtRec;
+    try {
+      txtRec = inRecord.QueryInterface(Ci.nsIDNSByTypeRecord);
+    } catch (e) {}
+    if (txtRec) {
+      this.resolve([inRequest, txtRec, inStatus, "onLookupByTypeComplete"]);
+    } else {
+      this.resolve([inRequest, inRecord, inStatus, "onLookupComplete"]);
+    }
+  }
+  // So we can await this as a promise.
+  then() {
+    return this.promise.then.apply(this.promise, arguments);
+  }
+}
+
+DNSListener.prototype.QueryInterface = ChromeUtils.generateQI([
+  Ci.nsIDNSListener,
+]);
+
+add_task(async function testEsniRequest() {
+  // use the h2 server as DOH provider
+  let listenerEsni = new DNSListener();
+  let request = dns.asyncResolveByType(
+    "_esni.example.com",
+    dns.RESOLVE_TYPE_TXT,
+    0,
+    listenerEsni,
+    mainThread,
+    defaultOriginAttributes
+  );
+
+  let [inRequest, inRecord, inStatus, inType] = await listenerEsni;
+  Assert.equal(inStatus, Cr.NS_OK, "status OK");
+  Assert.equal(inRequest, request, "correct request was used");
+  Assert.equal(inType, "onLookupByTypeComplete", "check correct type");
+  let answer = inRecord.getRecordsAsOneString();
+  Assert.equal(answer, test_answer, "got correct answer");
+});

netwerk/test/unit_ipc/test_esni_dns_fetch_wrap.js

@@ -0,0 +1,71 @@
+"use strict";
+
+let h2Port;
+let prefs;
+
+function setup() {
+  let env = Cc["@mozilla.org/process/environment;1"].getService(
+    Ci.nsIEnvironment
+  );
+  h2Port = env.get("MOZHTTP2_PORT");
+  Assert.notEqual(h2Port, null);
+  Assert.notEqual(h2Port, "");
+
+  // Set to allow the cert presented by our H2 server
+  do_get_profile();
+  prefs = Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefBranch);
+
+  prefs.setBoolPref("network.security.esni.enabled", false);
+  prefs.setBoolPref("network.http.spdy.enabled", true);
+  prefs.setBoolPref("network.http.spdy.enabled.http2", true);
+  // the TRR server is on 127.0.0.1
+  prefs.setCharPref("network.trr.bootstrapAddress", "127.0.0.1");
+
+  // make all native resolve calls "secretly" resolve localhost instead
+  prefs.setBoolPref("network.dns.native-is-localhost", true);
+
+  // 0 - off, 1 - race, 2 TRR first, 3 TRR only, 4 shadow
+  prefs.setIntPref("network.trr.mode", 2); // TRR first
+  prefs.setBoolPref("network.trr.wait-for-portal", false);
+  // don't confirm that TRR is working, just go!
+  prefs.setCharPref("network.trr.confirmationNS", "skip");
+
+  // So we can change the pref without clearing the cache to check a pushed
+  // record with a TRR path that fails.
+  prefs.setBoolPref("network.trr.clear-cache-on-pref-change", false);
+
+  // The moz-http2 cert is for foo.example.com and is signed by http2-ca.pem
+  // so add that cert to the trust list as a signing cert.  // the foo.example.com domain name.
+  const certdb = Cc["@mozilla.org/security/x509certdb;1"].getService(
+    Ci.nsIX509CertDB
+  );
+  addCertFromFile(certdb, "../unit/http2-ca.pem", "CTu,u,u");
+}
+
+setup();
+registerCleanupFunction(() => {
+  prefs.clearUserPref("network.security.esni.enabled");
+  prefs.clearUserPref("network.http.spdy.enabled");
+  prefs.clearUserPref("network.http.spdy.enabled.http2");
+  prefs.clearUserPref("network.dns.localDomains");
+  prefs.clearUserPref("network.dns.native-is-localhost");
+  prefs.clearUserPref("network.trr.mode");
+  prefs.clearUserPref("network.trr.uri");
+  prefs.clearUserPref("network.trr.credentials");
+  prefs.clearUserPref("network.trr.wait-for-portal");
+  prefs.clearUserPref("network.trr.allow-rfc1918");
+  prefs.clearUserPref("network.trr.useGET");
+  prefs.clearUserPref("network.trr.confirmationNS");
+  prefs.clearUserPref("network.trr.bootstrapAddress");
+  prefs.clearUserPref("network.trr.blacklist-duration");
+  prefs.clearUserPref("network.trr.request-timeout");
+  prefs.clearUserPref("network.trr.clear-cache-on-pref-change");
+});
+
+function run_test() {
+  prefs.setCharPref(
+    "network.trr.uri",
+    "https://foo.example.com:" + h2Port + "/esni-dns"
+  );
+  run_test_in_child("child_esni_dns_fetch1.js");
+}

netwerk/test/unit_ipc/xpcshell.ini

@@ -60,6 +60,7 @@ support-files =
   !/netwerk/test/unit/test_alt-data_cross_process.js
   !/netwerk/test/unit/test_httpcancel.js
   child_cookie_header.js
+  child_esni_dns_fetch1.js
 
 [test_bug528292_wrap.js]
 [test_cookie_header_stripped.js]
@@ -108,3 +109,4 @@ skip-if = true
 [test_multipart_streamconv_wrap.js]
 [test_alt-data_cross_process_wrap.js]
 [test_httpcancel_wrap.js]
+[test_esni_dns_fetch_wrap.js]