HelloMessage.c

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/************************************************************************************
* Copyright (C) 2020                                                               *
* TETCOS, Bangalore. India                                                         *
*                                                                                  *
* Tetcos owns the intellectual property rights in the Product and its content.     *
* The copying, redistribution, reselling or publication of any or all of the       *
* Product or its content without express prior written consent of Tetcos is        *
* prohibited. Ownership and / or any other right relating to the software and all *
* intellectual property rights therein shall remain at all times with Tetcos.      *
*                                                                                  *
* Author:    Shashi Kant Suman                                                       *
*                                                                                  *
* ---------------------------------------------------------------------------------*/
 
#include "main.h"
#include "AODV.h"
#include "List.h"
/**
This function generate the Hello Message Packets and transmit them.
*/
int fn_NetSim_AODV_TransmitHelloMessage(NetSim_EVENTDETAILS* pstruEventDetails)
{
    NetSim_EVENTDETAILS pevent;
    //Add an event to transmit next hello packet
    memcpy(&pevent,pstruEventDetails,sizeof pevent);
    pevent.dEventTime += AODV_HELLO_INTERVAL;
    fnpAddEvent(&pevent);
    if(AODV_DEV_VAR(pstruEventDetails->nDeviceId)->dLastBroadcastTime+AODV_HELLO_INTERVAL > pstruEventDetails->dEventTime)
        return 0; //Already broadcast packet sent
    if(AODV_DEV_VAR(pstruEventDetails->nDeviceId)->routeTable)
    {
        NetSim_PACKET* packet = fn_NetSim_AODV_GenerateCtrlPacket(pstruEventDetails->nDeviceId,
            0,
            0,
            pstruEventDetails->dEventTime,
            AODVctrlPacket_RREP);
        AODV_RREP* hello = calloc(1,sizeof* hello);
        packet->pstruNetworkData->Packet_RoutingProtocol = hello;
        packet->pstruNetworkData->nTTL = 2;
        hello->DestinationIPaddress = aodv_get_curr_ip();
        hello->DestinationSequenceNumber = AODV_DEV_VAR(pstruEventDetails->nDeviceId)->nSequenceNumber;
        hello->HopCount = 0;
        hello->LastAddress = aodv_get_curr_ip();
        hello->Lifetime = (unsigned int)(pstruEventDetails->dEventTime +
            (double)AODV_ALLOWED_HELLO_LOSS*AODV_HELLO_INTERVAL);
        hello->OriginatorIPaddress = aodv_get_curr_ip();
        //Broadcast hello message
        //Add network out event
        pevent.dEventTime = pstruEventDetails->dEventTime;
        pevent.dPacketSize = fnGetPacketSize(packet);
        pevent.nApplicationId = 0;
        pevent.nApplicationId = 0;
        pevent.nEventType = NETWORK_OUT_EVENT;
        pevent.nProtocolId = fn_NetSim_Stack_GetNWProtocol(pstruEventDetails->nDeviceId);
        pevent.nSubEventType = 0;
        pevent.pPacket = packet;
        pevent.szOtherDetails = NULL;
        fnpAddEvent(&pevent);
        packet->pstruNetworkData->szNextHopIp=NULL;
    }
    return 1;
}