tls_alert.c

00001 /*
00002 MiniTLS - A super trimmed down TLS/SSL Library for embedded devices
00003 Author: Donatien Garnier
00004 Copyright (C) 2013-2014 AppNearMe Ltd
00005 
00006 This program is free software; you can redistribute it and/or
00007 modify it under the terms of the GNU General Public License
00008 as published by the Free Software Foundation; either version 2
00009 of the License, or (at your option) any later version.
00010 
00011 This program is distributed in the hope that it will be useful,
00012 but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 GNU General Public License for more details.
00015 
00016 You should have received a copy of the GNU General Public License
00017 along with this program; if not, write to the Free Software
00018 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
00019 *//**
00020  * \file tls_alert.c
00021  * \copyright Copyright (c) AppNearMe Ltd 2013
00022  * \author Donatien Garnier
00023  */
00024 
00025 #define __DEBUG__ 4
00026 #ifndef __MODULE__
00027 #define __MODULE__ "tls_alert.c"
00028 #endif
00029 
00030 #include "core/fwk.h"
00031 #include "inc/minitls_errors.h"
00032 #include "tls_alert.h"
00033 
00034 minitls_err_t tls_alert_send( tls_record_t* record, tls_message_alert_level_t level, tls_message_alert_description_t description, buffer_t* buffer_tx )
00035 {
00036   if( buffer_size(buffer_tx) < 2 )
00037   {
00038     return MINITLS_ERR_BUFFER_TOO_SMALL;
00039   }
00040 
00041   buffer_reset(buffer_tx);
00042 
00043   buffer_nu8_write(buffer_tx, level);
00044   buffer_nu8_write(buffer_tx, description);
00045 
00046   minitls_err_t ret = tls_record_send(record, TLS_ALERT, buffer_tx);
00047   if(ret)
00048   {
00049     return ret;
00050   }
00051 
00052   return MINITLS_OK;
00053 }
00054 
00055 minitls_err_t tls_alert_process( tls_record_t* record, buffer_t* buffer_rx )
00056 {
00057   if( buffer_length(buffer_rx) < 2 )
00058   {
00059     return MINITLS_ERR_BUFFER_TOO_SMALL;
00060   }
00061 
00062   tls_message_alert_level_t level = buffer_nu8_read(buffer_rx);
00063   tls_message_alert_description_t description = buffer_nu8_read(buffer_rx);
00064 
00065   WARN("Alert: type: %d, description: %d", level, description);
00066   if(description == CLOSE_NOTIFY)
00067   {
00068     return MINITLS_ERR_CONNECTION_CLOSED;
00069   }
00070 
00071   //Always return error
00072   return MINITLS_ERR_PEER;
00073 }