_ Git - BearSSL/blob - src/ssl/ssl_client.c

   1 /*
   2  * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining
   5  * a copy of this software and associated documentation files (the
   6  * "Software"), to deal in the Software without restriction, including
   7  * without limitation the rights to use, copy, modify, merge, publish,
   8  * distribute, sublicense, and/or sell copies of the Software, and to
   9  * permit persons to whom the Software is furnished to do so, subject to
  10  * the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  */
  24
  25 #include "inner.h"
  26
  27 /* see bearssl_ssl.h */
  28 void
  29 br_ssl_client_zero(br_ssl_client_context *cc)
  30 {
  31         /*
  32          * For really standard C, we should explicitly set to NULL all
  33          * pointers, and 0 all other fields. However, on all our target
  34          * architectures, a direct memset() will work, be faster, and
  35          * use a lot less code.
  36          */
  37         memset(cc, 0, sizeof *cc);
  38 }
  39
  40 /* see bearssl_ssl.h */
  41 int
  42 br_ssl_client_reset(br_ssl_client_context *cc,
  43         const char *server_name, int resume_session)
  44 {
  45         size_t n;
  46
  47         br_ssl_engine_set_buffer(&cc->eng, NULL, 0, 0);
  48         cc->eng.version_out = cc->eng.version_min;
  49         if (!resume_session) {
  50                 br_ssl_client_forget_session(cc);
  51         }
  52         if (!br_ssl_engine_init_rand(&cc->eng)) {
  53                 return 0;
  54         }
  55
  56         /*
  57          * We always set back the "reneg" flag to 0 because we use it
  58          * to distinguish between first handshake and renegotiation.
  59          * Note that "renegotiation" and "session resumption" are two
  60          * different things.
  61          */
  62         cc->eng.reneg = 0;
  63
  64         if (server_name == NULL) {
  65                 cc->eng.server_name[0] = 0;
  66         } else {
  67                 n = strlen(server_name) + 1;
  68                 if (n > sizeof cc->eng.server_name) {
  69                         br_ssl_engine_fail(&cc->eng, BR_ERR_BAD_PARAM);
  70                         return 0;
  71                 }
  72                 memcpy(cc->eng.server_name, server_name, n);
  73         }
  74
  75         br_ssl_engine_hs_reset(&cc->eng,
  76                 br_ssl_hs_client_init_main, br_ssl_hs_client_run);
  77         return br_ssl_engine_last_error(&cc->eng) == BR_ERR_OK;
  78 }