1 files changed, 159 insertions, 0 deletions
diff --git a/netwerk/dns/TRR.h b/netwerk/dns/TRR.h
new file mode 100644
index 0000000000..82244c97a0
--- /dev/null
+++ b/netwerk/dns/TRR.h
@@ -0,0 +1,159 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set sw=2 ts=8 et tw=80 : */
+/* 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/. */
+
+#ifndef mozilla_net_TRR_h
+#define mozilla_net_TRR_h
+
+#include "mozilla/net/DNSByTypeRecord.h"
+#include "mozilla/Assertions.h"
+#include "nsClassHashtable.h"
+#include "nsIChannel.h"
+#include "nsIHttpPushListener.h"
+#include "nsIInterfaceRequestor.h"
+#include "nsIStreamListener.h"
+#include "nsThreadUtils.h"
+#include "nsXULAppAPI.h"
+#include "DNSPacket.h"
+#include "nsITRRSkipReason.h"
+
+class AHostResolver;
+class nsHostRecord;
+
+namespace mozilla {
+namespace net {
+
+class TRRService;
+class TRRServiceChannel;
+
+class TRR : public Runnable,
+            public nsITimerCallback,
+            public nsIHttpPushListener,
+            public nsIInterfaceRequestor,
+            public nsIStreamListener {
+ public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_NSIHTTPPUSHLISTENER
+  NS_DECL_NSIINTERFACEREQUESTOR
+  NS_DECL_NSIREQUESTOBSERVER
+  NS_DECL_NSISTREAMLISTENER
+  NS_DECL_NSITIMERCALLBACK
+
+  // Number of "steps" we follow CNAME chains
+  static const unsigned int kCnameChaseMax = 64;
+
+  // when firing off a normal A or AAAA query
+  explicit TRR(AHostResolver* aResolver, nsHostRecord* aRec,
+               enum TrrType aType);
+  // when following CNAMEs
+  explicit TRR(AHostResolver* aResolver, nsHostRecord* aRec, nsCString& aHost,
+               enum TrrType& aType, unsigned int aLoopCount, bool aPB);
+  // used on push
+  explicit TRR(AHostResolver* aResolver, bool aPB);
+  // to verify a domain
+  explicit TRR(AHostResolver* aResolver, nsACString& aHost, enum TrrType aType,
+               const nsACString& aOriginSuffix, bool aPB,
+               bool aUseFreshConnection);
+
+  NS_IMETHOD Run() override;
+  void Cancel(nsresult aStatus);
+  enum TrrType Type() { return mType; }
+  nsCString mHost;
+  RefPtr<nsHostRecord> mRec;
+  RefPtr<AHostResolver> mHostResolver;
+
+  void SetTimeout(uint32_t aTimeoutMs) { mTimeoutMs = aTimeoutMs; }
+
+  nsresult ChannelStatus() { return mChannelStatus; }
+
+  enum RequestPurpose {
+    Resolve,
+    Confirmation,
+    Blocklist,
+  };
+
+  RequestPurpose Purpose() { return mPurpose; }
+  void SetPurpose(RequestPurpose aPurpose) { mPurpose = aPurpose; }
+  TRRSkippedReason SkipReason() const { return mTRRSkippedReason; }
+
+ protected:
+  virtual ~TRR() = default;
+  virtual DNSPacket* GetOrCreateDNSPacket();
+  virtual nsresult CreateQueryURI(nsIURI** aOutURI);
+  virtual const char* ContentType() const { return "application/dns-message"; }
+  virtual DNSResolverType ResolverType() const { return DNSResolverType::TRR; }
+  virtual bool MaybeBlockRequest();
+  virtual void RecordProcessingTime(nsIChannel* aChannel);
+  virtual void ReportStatus(nsresult aStatusCode);
+  virtual void HandleTimeout();
+  virtual void HandleEncodeError(nsresult aStatusCode) {}
+  virtual void HandleDecodeError(nsresult aStatusCode);
+  nsresult SendHTTPRequest();
+  nsresult ReturnData(nsIChannel* aChannel);
+
+  // FailData() must be called to signal that the asynch TRR resolve is
+  // completed. For failed name resolves ("no such host"), the 'error' it
+  // passses on in its argument must be NS_ERROR_UNKNOWN_HOST. Other errors
+  // (if host was blocklisted, there as a bad content-type received, etc)
+  // other error codes must be used. This distinction is important for the
+  // subsequent logic to separate the error reasons.
+  nsresult FailData(nsresult error);
+  static nsresult DohDecodeQuery(const nsCString& query, nsCString& host,
+                                 enum TrrType& type);
+  nsresult ReceivePush(nsIHttpChannel* pushed, nsHostRecord* pushedRec);
+  nsresult On200Response(nsIChannel* aChannel);
+  nsresult FollowCname(nsIChannel* aChannel);
+
+  bool HasUsableResponse();
+
+  bool UseDefaultServer();
+  void SaveAdditionalRecords(
+      const nsClassHashtable<nsCStringHashKey, DOHresp>& aRecords);
+
+  friend class TRRServiceChannel;
+  static nsresult SetupTRRServiceChannelInternal(
+      nsIHttpChannel* aChannel, bool aUseGet, const nsACString& aContentType);
+
+  void StoreIPHintAsDNSRecord(const struct SVCB& aSVCBRecord);
+
+  nsCOMPtr<nsIChannel> mChannel;
+  enum TrrType mType { TRRTYPE_A };
+  UniquePtr<DNSPacket> mPacket;
+  bool mFailed = false;
+  bool mPB = false;
+  DOHresp mDNS;
+  nsresult mChannelStatus = NS_OK;
+
+  RequestPurpose mPurpose = Resolve;
+  Atomic<bool, Relaxed> mCancelled{false};
+
+  // The request timeout in milliseconds. If 0 we will use the default timeout
+  // we get from the prefs.
+  uint32_t mTimeoutMs = 0;
+  nsCOMPtr<nsITimer> mTimeout;
+  nsCString mCname;
+  uint32_t mCnameLoop = kCnameChaseMax;  // loop detection counter
+
+  uint32_t mTTL = UINT32_MAX;
+  TypeRecordResultType mResult = mozilla::AsVariant(Nothing());
+
+  TRRSkippedReason mTRRSkippedReason = TRRSkippedReason::TRR_UNSET;
+  void RecordReason(TRRSkippedReason reason) {
+    if (mTRRSkippedReason == TRRSkippedReason::TRR_UNSET) {
+      mTRRSkippedReason = reason;
+    }
+  }
+
+  // keep a copy of the originSuffix for the cases where mRec == nullptr */
+  const nsCString mOriginSuffix;
+
+  // If true, we set LOAD_FRESH_CONNECTION on our channel's load flags.
+  bool mUseFreshConnection = false;
+};
+
+}  // namespace net
+}  // namespace mozilla
+
+#endif  // include guard