Implement SSL server socket over OpenSSL.

net/socket/openssl_ssl_util.h

+// Copyright (c) 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef NET_SOCKET_OPENSSL_SSL_UTIL_H_
+#define NET_SOCKET_OPENSSL_SSL_UTIL_H_
+
+namespace crypto {
+class OpenSSLErrStackTracer;
+}
+
+namespace net {
+
+// Utility to construct the appropriate set & clear masks for use the OpenSSL
+// options and mode configuration functions. (SSL_set_options etc)
+struct SslSetClearMask {
+  SslSetClearMask();
+  void ConfigureFlag(long flag, bool state);
+
+  long set_mask;
+  long clear_mask;
+};
+
+// Converts an OpenSSL error code into a net error code, walking the OpenSSL
+// error stack if needed. Note that |tracer| is not currently used in the
+// implementation, but is passed in anyway as this ensures the caller will clear
+// any residual codes left on the error stack.
+int MapOpenSSLError(int err, const crypto::OpenSSLErrStackTracer& tracer);
+
+}  // namespace net
+
+#endif  // NET_SOCKET_OPENSSL_SSL_UTIL_H_