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// Copyright 2019 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 UTIL_CRYPTO_OPENSSL_UTIL_H_
#define UTIL_CRYPTO_OPENSSL_UTIL_H_
#include <openssl/ssl.h>
#include <stddef.h>
#include <cstring>
#include "platform/base/error.h"
#include "platform/base/location.h"
#include "platform/base/macros.h"
namespace openscreen {
// Initialize OpenSSL if it isn't already initialized. This must be called
// before any other OpenSSL functions though it is safe and cheap to call this
// multiple times.
// This function is thread-safe, and OpenSSL will only ever be initialized once.
// OpenSSL will be properly shut down on program exit.
// Multiple sequential calls to EnsureOpenSSLInit or EnsureOpenSSLCleanup are
// ignored by OpenSSL itself.
void EnsureOpenSSLInit();
void EnsureOpenSSLCleanup();
// Drains the OpenSSL ERR_get_error stack. On a debug build the error codes
// are send to VLOG(1), on a release build they are disregarded. In most
// cases you should pass CURRENT_LOCATION as the |location|.
void ClearOpenSSLERRStack(const Location& location);
Error GetSSLError(const SSL* ssl, int return_code);
// Place an instance of this class on the call stack to automatically clear
// the OpenSSL error stack on function exit.
class OpenSSLErrStackTracer {
public:
// Pass CURRENT_LOCATION as |location|, to help track the source of OpenSSL
// error messages. Note any diagnostic emitted will be tagged with the
// location of the constructor call as it's not possible to trace a
// destructor's callsite.
explicit OpenSSLErrStackTracer(const Location& location)
: location_(location) {
EnsureOpenSSLInit();
}
~OpenSSLErrStackTracer() { ClearOpenSSLERRStack(location_); }
private:
const Location location_;
OSP_DISALLOW_IMPLICIT_CONSTRUCTORS(OpenSSLErrStackTracer);
};
} // namespace openscreen
#endif // UTIL_CRYPTO_OPENSSL_UTIL_H_
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