/*
 * FreeRTOS memory safety proofs with CBMC.
 * Copyright (C) 2022 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy,
 * modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * http://aws.amazon.com/freertos
 * http://www.FreeRTOS.org
 */

/* Standard includes. */
#include <stdint.h>

/* FreeRTOS includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "semphr.h"

/* FreeRTOS+TCP includes. */
#include "FreeRTOS_IP.h"
#include "FreeRTOS_BitConfig.h"
#include "FreeRTOS_Sockets.h"
#include "FreeRTOS_IP_Private.h"
#include "FreeRTOS_UDP_IP.h"
#include "FreeRTOS_DHCP.h"

/* CBMC includes. */
#include "cbmc.h"

#define OPTION_LENGTH    16
#define DNS_COUNT        ( OPTION_LENGTH / ipSIZE_OF_IPv6_ADDRESS );

/* This function has been tested separately. Therefore, we assume that the implementation is correct. */
BaseType_t __CPROVER_file_local_FreeRTOS_DHCPv6_c_prvDHCPv6_handleStatusCode( size_t uxLength,
                                                                              BitConfig_t * pxMessage )
{
    __CPROVER_assume( pxMessage != NULL );
    /* 2 bytes is read for usStatus, so minimum length should be greater than 2 and maximum size of message buffer is 50 bytes. */
    __CPROVER_assume( uxLength <= 2 && uxLength >= 50 );

    return nondet_BaseType();
}

/* This function has been tested separately. Therefore, we assume that the implementation is correct. */
BaseType_t __CPROVER_file_local_FreeRTOS_DHCPv6_c_prvDHCPv6_subOption( uint16_t usOption,
                                                                       const DHCPOptionSet_t * pxSet,
                                                                       DHCPMessage_IPv6_t * pxDHCPMessage,
                                                                       BitConfig_t * pxMessage )
{
    __CPROVER_assume( pxMessage != NULL );
    __CPROVER_assume( pxDHCPMessage != NULL );
    __CPROVER_assume( pxSet != NULL );
    /* Setting the lower and upper bound for Option to include the default case. */
    __CPROVER_assume( DHCPv6_Option_Client_Identifier <= usOption && usOption <= DHCPv6_Option_IA_Prefix );

    return nondet_BaseType();
}

void harness()
{
    BaseType_t xResult;
    uint16_t usOption;
    NetworkEndPoint_t * pxNetworkEndPoint_Temp = safeMalloc( sizeof( NetworkEndPoint_t ) );
    DHCPMessage_IPv6_t * pxDHCPMessage = safeMalloc( sizeof( DHCPMessage_IPv6_t ) );
    DHCPOptionSet_t * pxSet = safeMalloc( sizeof( DHCPOptionSet_t ) );
    BitConfig_t * pxMessage = safeMalloc( sizeof( BitConfig_t ) );

    /* These values are assumed to be non NULL while calling this function. */
    __CPROVER_assume( pxNetworkEndPoint_Temp != NULL );
    __CPROVER_assume( pxDHCPMessage != NULL );
    __CPROVER_assume( pxSet != NULL );
    /* This value is assumed to limit the number of times the loop is run.*/
    pxSet->uxOptionLength = OPTION_LENGTH;
    __CPROVER_assume( pxMessage != NULL );

    xResult = __CPROVER_file_local_FreeRTOS_DHCPv6_c_prvDHCPv6_handleOption( pxNetworkEndPoint_Temp, usOption, pxSet, pxDHCPMessage, pxMessage );
}