Repo created

TMessagesProj/jni/voip/webrtc/rtc_base/openssl_session_cache.h

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+/*
+ *  Copyright 2018 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef RTC_BASE_OPENSSL_SESSION_CACHE_H_
+#define RTC_BASE_OPENSSL_SESSION_CACHE_H_
+
+#include <openssl/ossl_typ.h>
+
+#include <map>
+#include <string>
+
+#include "absl/strings/string_view.h"
+#include "rtc_base/ssl_stream_adapter.h"
+#include "rtc_base/string_utils.h"
+
+#ifndef OPENSSL_IS_BORINGSSL
+typedef struct ssl_session_st SSL_SESSION;
+#endif
+
+namespace rtc {
+
+// The OpenSSLSessionCache maps hostnames to SSL_SESSIONS. This cache is
+// owned by the OpenSSLAdapterFactory and is passed down to each OpenSSLAdapter
+// created with the factory.
+class OpenSSLSessionCache final {
+ public:
+  // Creates a new OpenSSLSessionCache using the provided the SSL_CTX and
+  // the ssl_mode. The SSL_CTX will be up_refed. ssl_ctx cannot be nullptr,
+  // the constructor immediately dchecks this.
+  OpenSSLSessionCache(SSLMode ssl_mode, SSL_CTX* ssl_ctx);
+  // Frees the cached SSL_SESSIONS and then frees the SSL_CTX.
+  ~OpenSSLSessionCache();
+
+  OpenSSLSessionCache(const OpenSSLSessionCache&) = delete;
+  OpenSSLSessionCache& operator=(const OpenSSLSessionCache&) = delete;
+
+  // Looks up a session by hostname. The returned SSL_SESSION is not up_refed.
+  SSL_SESSION* LookupSession(absl::string_view hostname) const;
+  // Adds a session to the cache, and up_refs it. Any existing session with the
+  // same hostname is replaced.
+  void AddSession(absl::string_view hostname, SSL_SESSION* session);
+  // Returns the true underlying SSL Context that holds these cached sessions.
+  SSL_CTX* GetSSLContext() const;
+  // The SSL Mode tht the OpenSSLSessionCache was constructed with. This cannot
+  // be changed after launch.
+  SSLMode GetSSLMode() const;
+
+ private:
+  // Holds the SSL Mode that the OpenSSLCache was initialized with. This is
+  // immutable after creation and cannot change.
+  const SSLMode ssl_mode_;
+  /// SSL Context for all shared cached sessions. This SSL_CTX is initialized
+  //  with SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_CLIENT); Meaning
+  //  all client sessions will be added to the cache internal to the context.
+  SSL_CTX* ssl_ctx_ = nullptr;
+  // Map of hostnames to SSL_SESSIONs; holds references to the SSL_SESSIONs,
+  // which are cleaned up when the factory is destroyed.
+  // TODO(juberti): Add LRU eviction to keep the cache from growing forever.
+  std::map<std::string, SSL_SESSION*, rtc::AbslStringViewCmp> sessions_;
+  // The cache should never be copied or assigned directly.
+};
+
+}  // namespace rtc
+
+#endif  // RTC_BASE_OPENSSL_SESSION_CACHE_H_