1 files changed, 75 insertions, 0 deletions
diff --git a/dnsdist-nghttp2.hh b/dnsdist-nghttp2.hh
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+++ b/dnsdist-nghttp2.hh
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+/*
+ * This file is part of PowerDNS or dnsdist.
+ * Copyright -- PowerDNS.COM B.V. and its contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * In addition, for the avoidance of any doubt, permission is granted to
+ * link this program with OpenSSL and to (re)distribute the binaries
+ * produced as the result of such linking.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#pragma once
+
+#include <memory>
+#include <mutex>
+#include <vector>
+
+#include "dnsdist-tcp.hh"
+#include "stat_t.hh"
+
+struct CrossProtocolQuery;
+
+class DoHClientCollection
+{
+public:
+  DoHClientCollection(size_t numberOfThreads);
+
+  uint64_t getThreadsCount() const
+  {
+    return d_numberOfThreads;
+  }
+
+  bool passCrossProtocolQueryToThread(std::unique_ptr<CrossProtocolQuery>&& cpq);
+  void addThread();
+
+private:
+  struct DoHWorkerThread;
+
+  std::mutex d_mutex;
+  /* we only alter that vector at configuration time, and then
+     it is never modified at runtime, so we don't take a lock
+     after the configuration phase */
+  std::vector<DoHWorkerThread> d_clientThreads;
+  pdns::stat_t d_pos{0};
+  uint64_t d_numberOfThreads{0};
+};
+
+extern std::unique_ptr<DoHClientCollection> g_dohClientThreads;
+extern std::atomic<uint64_t> g_dohStatesDumpRequested;
+extern std::optional<uint16_t> g_outgoingDoHWorkerThreads;
+
+class TLSCtx;
+
+bool initDoHWorkers();
+bool setupDoHClientProtocolNegotiation(std::shared_ptr<TLSCtx>& ctx);
+
+/* opens a new HTTP/2 connection to the supplied backend (attached to the supplied multiplexer), sends the query,
+   waits for the response to come back or an error to occur then notifies the sender, closing the connection. */
+bool sendH2Query(const std::shared_ptr<DownstreamState>& ds, std::unique_ptr<FDMultiplexer>& mplexer, std::shared_ptr<TCPQuerySender>& sender, InternalQuery&& query, bool healthCheck);
+size_t handleH2Timeouts(FDMultiplexer& mplexer, const struct timeval& now);
+size_t clearH2Connections();
+
+void setDoHDownstreamCleanupInterval(uint16_t max);
+void setDoHDownstreamMaxIdleTime(uint16_t max);
+void setDoHDownstreamMaxIdleConnectionsPerBackend(size_t max);