lib/gnutls_record.h

   1 /*
   2  * Copyright (C) 2000-2012 Free Software Foundation, 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 <http://www.gnu.org/licenses/>
  20  *
  21  */
  22
  23 #ifndef GNUTLS_RECORD_H
  24 #define GNUTLS_RECORD_H
  25
  26 #include <gnutls/gnutls.h>
  27 #include <gnutls_buffers.h>
  28 #include <gnutls_constate.h>
  29
  30 ssize_t _gnutls_send_tlen_int(gnutls_session_t session,
  31                               content_type_t type,
  32                               gnutls_handshake_description_t htype,
  33                               unsigned int epoch_rel, const void *data,
  34                               size_t sizeofdata, size_t min_pad,
  35                               unsigned int mflags);
  36
  37 inline static ssize_t
  38 _gnutls_send_int(gnutls_session_t session, content_type_t type,
  39                  gnutls_handshake_description_t htype,
  40                  unsigned int epoch_rel, const void *_data,
  41                  size_t data_size, unsigned int mflags)
  42 {
  43         return _gnutls_send_tlen_int(session, type, htype, epoch_rel,
  44                                      _data, data_size, 0, mflags);
  45 }
  46
  47 ssize_t _gnutls_recv_int(gnutls_session_t session, content_type_t type,
  48                          gnutls_handshake_description_t,
  49                          gnutls_packet_t *packet,
  50                          uint8_t * data,
  51                          size_t sizeofdata, void *seq, unsigned int ms);
  52
  53 inline static unsigned max_record_recv_size(gnutls_session_t session)
  54 {
  55         unsigned size;
  56
  57         size = MAX_CIPHER_BLOCK_SIZE /*iv*/ + MAX_PAD_SIZE + MAX_HASH_SIZE/*MAC*/;
  58
  59         if (gnutls_compression_get(session)!=GNUTLS_COMP_NULL || session->internals.priorities.allow_large_records != 0)
  60                 size += EXTRA_COMP_SIZE;
  61
  62         size += session->security_parameters.max_record_recv_size + RECORD_HEADER_SIZE(session);
  63
  64         return size;
  65 }
  66
  67 inline static unsigned max_decrypted_size(gnutls_session_t session)
  68 {
  69         unsigned size = 0;
  70
  71         if (session->internals.priorities.allow_large_records != 0)
  72                 size += EXTRA_COMP_SIZE;
  73
  74         size += session->security_parameters.max_record_recv_size;
  75
  76         return size;
  77 }
  78
  79 /* Returns the headers + any IV that the ciphersuite
  80  * requires */
  81 inline static
  82 unsigned int get_total_headers(gnutls_session_t session)
  83 {
  84         int ret;
  85         record_parameters_st *params;
  86         unsigned total = RECORD_HEADER_SIZE(session);
  87
  88         ret = _gnutls_epoch_get(session, EPOCH_WRITE_CURRENT, &params);
  89         if (ret < 0) {
  90                 return total;
  91         }
  92
  93         return total + _gnutls_cipher_get_explicit_iv_size(params->cipher);
  94 }
  95
  96 inline static
  97 unsigned int get_total_headers2(gnutls_session_t session, record_parameters_st *params)
  98 {
  99         unsigned total = RECORD_HEADER_SIZE(session);
 100
 101         return total + _gnutls_cipher_get_explicit_iv_size(params->cipher);
 102 }
 103
 104 #endif