Get Source and Destination IP Addresses in Phy MonitorSnifferRx Trace source method

[Hassam Mughal]

Greetings everyone!

I am trying to get the source and destination IP address of the packet in my Phy MonitorSnifferRx trace by using the following method;

Ipv4Address GetSourceAddress(Ptr<const Packet> p)
{
        Ipv4Address src;
        // To get a header from Ptr<Packet> packet first, copy the packet
        Ptr<Packet> q = p->Copy();
        // Use indicator to search the packet
        PacketMetadata::ItemIterator metadataIterator = q->BeginItem();
        PacketMetadata::Item item;
        while (metadataIterator.HasNext())
        {
                item = metadataIterator.Next();
                NS_LOG_FUNCTION("item name: " << item.tid.GetName());
                // If we want to have a dsdv header
                if(item.tid.GetName() == "ns3::ArpHeader")
                {
                        Callback<ObjectBase *> constr = item.tid.GetConstructor();
                        NS_ASSERT(!constr.IsNull());
                        // Ptr<> and DynamicCast<> won't work here as all headers are from ObjectBase, not Object
                        ObjectBase *instance = constr();
                        NS_ASSERT(instance != 0);
                        ArpHeader* arpHeader = dynamic_cast<ArpHeader*>(instance);
                        NS_ASSERT(arpHeader != 0);
                        arpHeader->Deserialize(item.current);
                        src = arpHeader->GetSourceIpv4Address();
                }
        }
  return src;
}Ipv4Address GetDestAddress(Ptr<const Packet> p)
{
        Ipv4Address dest;
        // To get a header from Ptr<Packet> packet first, copy the packet
        Ptr<Packet> q = p->Copy();
        // Use indicator to search the packet
        PacketMetadata::ItemIterator metadataIterator = q->BeginItem();
        PacketMetadata::Item item;
        while (metadataIterator.HasNext())
        {
                item = metadataIterator.Next();
                NS_LOG_FUNCTION("item name: " << item.tid.GetName());
                // If we want to have a dsdv header
                if(item.tid.GetName() == "ns3::ArpHeader")
                {
                        Callback<ObjectBase *> constr = item.tid.GetConstructor();
                        NS_ASSERT(!constr.IsNull());
                        // Ptr<> and DynamicCast<> won't work here as all headers are from ObjectBase, not Object
                        ObjectBase *instance = constr();
                        NS_ASSERT(instance != 0);
                        ArpHeader* arpHeader = dynamic_cast<ArpHeader*>(instance);
                        NS_ASSERT(arpHeader != 0);
                        arpHeader->Deserialize(item.current);
                        dest = arpHeader->GetDestinationIpv4Address();
                }
        }
  return dest;
}

And in this trace source method, I am calling them.

void
Rx (std::string context, Ptr <const Packet> packet, uint16_t channelFreqMhz,  WifiTxVector txVector, MpduInfo aMpdu, SignalNoiseDbm signalNoise){
        //context will include info about the source of this event. Use string manipulation if you want to extract info.
        //std::cout << BOLD_CODE <<  context << END_CODE << std::endl;
        //Print the info.
        Packet::EnablePrinting();
                Packet::EnableChecking();
        packet->Print(std::cout << "\nTime: " << Simulator::Now().GetSeconds() << "s, Packet Details are: ");
        Ipv4Address src_ip = GetSourceAddress(packet);
        Ipv4Address des_ip = GetDestAddress(packet);    if(packet->GetSize() >= 500){
                counterAppRX++;
        } else {
                counterRX++;
        }
        //Packet Received from: " << src_ip << ", Destination address in Packet: " << des_ip<< ",       NS_LOG_DEBUG(" Packet Received from: " << src_ip << ", Destination address in Packet: " << des_ip<< ", Size = " << packet->GetSize()
                          << " Freq = "<<channelFreqMhz
                          << " Mode = " << txVector.GetMode()
                          << " ReceptionDataRate = " << txVector.GetMode().GetDataRate(txVector)
                          << " RX Counter: " << counterRX << "\t RX APP Counter: " << counterAppRX);
        m_rxDataRate = txVector.GetMode().GetDataRate(txVector)/1000000;        //We can also examine the WifiMacHeader
        WifiMacHeader hdr;
        if (packet->PeekHeader(hdr))
        {
                NS_LOG_DEBUG("\tDestination MAC : " << hdr.GetAddr1() << "\tSource MAC : " << hdr.GetAddr2());
        }
}

However, I am receiving the following error in my log file as attached.

assert failed. cond="uid <= m_information.size () && uid != 0", file=../src/core/model/type-id.cc, line=458

Any guidance or help in this regard will be highly appreciated. 

Thanks