1 files changed, 114 insertions, 0 deletions
diff --git a/netwerk/dns/TRRQuery.h b/netwerk/dns/TRRQuery.h
new file mode 100644
index 0000000000..14f08ac7ac
--- /dev/null
+++ b/netwerk/dns/TRRQuery.h
@@ -0,0 +1,114 @@
+/* -*- 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_TRRQuery_h
+#define mozilla_net_TRRQuery_h
+
+#include "nsHostResolver.h"
+#include "DNSPacket.h"
+
+namespace mozilla {
+namespace net {
+
+class TRRQuery : public AHostResolver {
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(TRRQuery, override)
+
+ public:
+  TRRQuery(nsHostResolver* aHostResolver, nsHostRecord* aHostRecord)
+      : mHostResolver(aHostResolver),
+        mRecord(aHostRecord),
+        mTrrLock("TRRQuery.mTrrLock") {}
+
+  nsresult DispatchLookup(TRR* pushedTRR = nullptr, bool aUseODoHProxy = false);
+
+  void Cancel(nsresult aStatus);
+
+  enum TRRState { INIT, STARTED, OK, FAILED };
+  TRRState mTrrAUsed = INIT;
+  TRRState mTrrAAAAUsed = INIT;
+
+  TRRSkippedReason mTRRAFailReason = TRRSkippedReason::TRR_UNSET;
+  TRRSkippedReason mTRRAAAAFailReason = TRRSkippedReason::TRR_UNSET;
+
+  virtual LookupStatus CompleteLookup(nsHostRecord*, nsresult,
+                                      mozilla::net::AddrInfo*, bool pb,
+                                      const nsACString& aOriginsuffix,
+                                      nsHostRecord::TRRSkippedReason aReason,
+                                      TRR* aTRRRequest) override;
+  virtual LookupStatus CompleteLookupByType(
+      nsHostRecord*, nsresult, mozilla::net::TypeRecordResultType& aResult,
+      uint32_t aTtl, bool pb) override;
+  virtual nsresult GetHostRecord(const nsACString& host,
+                                 const nsACString& aTrrServer, uint16_t type,
+                                 nsIDNSService::DNSFlags flags, uint16_t af,
+                                 bool pb, const nsCString& originSuffix,
+                                 nsHostRecord** result) override {
+    if (!mHostResolver) {
+      return NS_ERROR_FAILURE;
+    }
+    return mHostResolver->GetHostRecord(host, aTrrServer, type, flags, af, pb,
+                                        originSuffix, result);
+  }
+  virtual nsresult TrrLookup_unlocked(
+      nsHostRecord* rec, mozilla::net::TRR* pushedTRR = nullptr) override {
+    if (!mHostResolver) {
+      return NS_ERROR_FAILURE;
+    }
+    return mHostResolver->TrrLookup_unlocked(rec, pushedTRR);
+  }
+  virtual void MaybeRenewHostRecord(nsHostRecord* aRec) override {
+    if (!mHostResolver) {
+      return;
+    }
+    mHostResolver->MaybeRenewHostRecord(aRec);
+  }
+
+  mozilla::TimeDuration Duration() { return mTrrDuration; }
+
+ private:
+  nsresult DispatchByTypeLookup(TRR* pushedTRR = nullptr,
+                                bool aUseODoHProxy = false);
+
+ private:
+  ~TRRQuery() = default;
+
+  void MarkSendingTRR(TRR* trr, TrrType rectype, MutexAutoLock&);
+  void PrepareQuery(bool aUseODoH, TrrType aRecType,
+                    nsTArray<RefPtr<TRR>>& aRequestsToSend);
+  bool SendQueries(nsTArray<RefPtr<TRR>>& aRequestsToSend);
+
+  RefPtr<nsHostResolver> mHostResolver;
+  RefPtr<nsHostRecord> mRecord;
+
+  Mutex mTrrLock
+      MOZ_UNANNOTATED;  // lock when accessing the mTrrA[AAA] pointers
+  RefPtr<mozilla::net::TRR> mTrrA;
+  RefPtr<mozilla::net::TRR> mTrrAAAA;
+  RefPtr<mozilla::net::TRR> mTrrByType;
+  // |mTRRRequestCounter| indicates the number of TRR requests that were
+  // dispatched sucessfully. Generally, this counter is increased to 2 after
+  // mTrrA and mTrrAAAA are dispatched, and is decreased by 1 when
+  // CompleteLookup is called. Note that nsHostResolver::CompleteLookup is only
+  // called when this counter equals to 0.
+  Atomic<uint32_t> mTRRRequestCounter{0};
+
+  uint8_t mTRRSuccess = 0;  // number of successful TRR responses
+  bool mUsingODoH = false;
+  bool mCalledCompleteLookup = false;
+
+  mozilla::TimeDuration mTrrDuration;
+  mozilla::TimeStamp mTrrStart;
+
+  RefPtr<mozilla::net::AddrInfo> mAddrInfoA;
+  RefPtr<mozilla::net::AddrInfo> mAddrInfoAAAA;
+  nsresult mAResult = NS_OK;
+  nsresult mAAAAResult = NS_OK;
+};
+
+}  // namespace net
+}  // namespace mozilla
+
+#endif  // mozilla_net_TRRQuery_h