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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef CONSCRYPT_SSL_ERROR_H_
     18 #define CONSCRYPT_SSL_ERROR_H_
     19 
     20 #include <openssl/ssl.h>
     21 
     22 namespace conscrypt {
     23 
     24 /**
     25  * Manages the freeing of the SSL error stack. This allows you to
     26  * instantiate this object during an SSL call that may fail and not worry
     27  * about manually calling ERR_clear_error() later.
     28  *
     29  * As an optimization, you can also call .release() for passing as an
     30  * argument to things that free the error stack state as a side-effect.
     31  */
     32 class SslError {
     33  public:
     34     SslError() : sslError_(SSL_ERROR_NONE), released_(false) {}
     35 
     36     SslError(SSL* ssl, int returnCode) : sslError_(SSL_ERROR_NONE), released_(false) {
     37         reset(ssl, returnCode);
     38     }
     39 
     40     ~SslError() {
     41         if (!released_ && sslError_ != SSL_ERROR_NONE) {
     42             ERR_clear_error();
     43         }
     44     }
     45 
     46     int get() const {
     47         return sslError_;
     48     }
     49 
     50     void reset(SSL* ssl, int returnCode) {
     51         if (returnCode <= 0) {
     52             sslError_ = SSL_get_error(ssl, returnCode);
     53         } else {
     54             sslError_ = SSL_ERROR_NONE;
     55         }
     56     }
     57 
     58     int release() {
     59         released_ = true;
     60         return sslError_;
     61     }
     62 
     63  private:
     64     int sslError_;
     65     bool released_;
     66 };
     67 
     68 }  // namespace conscrypt
     69 
     70 #endif  // CONSCRYPT_SSL_ERROR_H_
     71