LCOV - code coverage report
Current view: top level - builds/gnutls/coverage/gnutls-git/lib - extv.h (source / functions) Hit Total Coverage
Test: GnuTLS-3.6.14 Code Coverage Lines: 14 16 87.5 %
Date: 2020-10-30 04:50:48 Functions: 2 2 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /*
       2             :  * Copyright (C) 2017 Red Hat, Inc.
       3             :  *
       4             :  * Author: Nikos Mavrogiannopoulos
       5             :  *
       6             :  * This file is part of GnuTLS.
       7             :  *
       8             :  * The GnuTLS is free software; you can redistribute it and/or
       9             :  * modify it under the terms of the GNU Lesser General Public License
      10             :  * as published by the Free Software Foundation; either version 2.1 of
      11             :  * the License, or (at your option) any later version.
      12             :  *
      13             :  * This library is distributed in the hope that it will be useful, but
      14             :  * WITHOUT ANY WARRANTY; without even the implied warranty of
      15             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      16             :  * Lesser General Public License for more details.
      17             :  *
      18             :  * You should have received a copy of the GNU Lesser General Public License
      19             :  * along with this program.  If not, see <https://www.gnu.org/licenses/>
      20             :  *
      21             :  */
      22             : 
      23             : #ifndef GNUTLS_LIB_EXTV_H
      24             : #define GNUTLS_LIB_EXTV_H
      25             : 
      26             : #include <gnutls/gnutls.h>
      27             : #include "str.h"
      28             : 
      29             : /* Iterates through all TLS-type extensions in data, and
      30             :  * calls the callback function for each of them. The ctx, flags
      31             :  * and parse_type are passed verbatim to callback. */
      32             : int _gnutls_extv_parse(void *ctx,
      33             :                        gnutls_ext_raw_process_func cb,
      34             :                        const uint8_t * data, int data_size);
      35             : 
      36             : inline static
      37       32145 : int _gnutls_extv_append_init(gnutls_buffer_st *buf)
      38             : {
      39       32145 :         unsigned pos;
      40       32145 :         int ret;
      41             : 
      42       32145 :         pos = buf->length;
      43             : 
      44       32145 :         ret = _gnutls_buffer_append_prefix(buf, 16, 0);
      45       32145 :         if (ret < 0)
      46           0 :                 return gnutls_assert_val(ret);
      47             : 
      48       32145 :         return pos;
      49             : }
      50             : 
      51             : /* its input is the buffer and the return value of _gnutls_extv_append_init()
      52             :  * @is_hello: should be true for client and server hello messages.
      53             :  */
      54             : inline static
      55       31989 : int _gnutls_extv_append_final(gnutls_buffer_st *buf, unsigned init, unsigned is_hello)
      56             : {
      57       31989 :         unsigned size = buf->length - init - 2;
      58             : 
      59       31989 :         if (size > UINT16_MAX) /* sent too many extensions */
      60           0 :                 return gnutls_assert_val(GNUTLS_E_HANDSHAKE_TOO_LARGE);
      61             : 
      62       31989 :         if (size > 0)
      63       21575 :                 _gnutls_write_uint16(size, &buf->data[init]);
      64       10414 :         else if (is_hello && size == 0) {
      65             :                 /* there is no point to send empty extension bytes, and
      66             :                  * they are known to break certain clients */
      67         465 :                 buf->length -= 2;
      68             :         }
      69             : 
      70             :         return 0;
      71             : }
      72             : 
      73             : typedef int (*extv_append_func)(void *ctx, gnutls_buffer_st *buf);
      74             : 
      75             : int _gnutls_extv_append(gnutls_buffer_st *buf,
      76             :                         uint16_t tls_id,
      77             :                         void *ctx,
      78             :                         extv_append_func cb);
      79             : 
      80             : 
      81             : #endif /* GNUTLS_LIB_EXTV_H */

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