inet::IcmpHeaderSerializer Class Reference

Converts between IcmpHeader and binary (network byte order) ICMP header. More...

#include <IcmpHeaderSerializer.h>

Inheritance diagram for inet::IcmpHeaderSerializer:

Public Member Functions
	IcmpHeaderSerializer ()
Public Member Functions inherited from inet::FieldsChunkSerializer
virtual void	serialize (MemoryOutputStream &stream, const Ptr< const Chunk > &chunk, b offset, b length) const override
	Serializes a chunk into a stream by writing the bytes representing the chunk at the end of the stream. More...
virtual const Ptr< Chunk >	deserialize (MemoryInputStream &stream, const std::type_info &typeInfo) const override
	Deserializes a chunk from a stream by reading the bytes at the current position of the stream. More...

Protected Member Functions
virtual void	serialize (MemoryOutputStream &stream, const Ptr< const Chunk > &chunk) const override
	Serializes a chunk into a stream by writing all bytes representing the chunk at the end of the stream. More...
virtual const Ptr< Chunk >	deserialize (MemoryInputStream &stream) const override
	Deserializes a chunk from a stream by reading the bytes at the current position of the stream. More...

Additional Inherited Members
Static Public Attributes inherited from inet::ChunkSerializer
static b	totalSerializedLength = b(0)
static b	totalDeserializedLength = b(0)

Detailed Description

Converts between IcmpHeader and binary (network byte order) ICMP header.

Constructor & Destructor Documentation

IcmpHeaderSerializer()

inet::IcmpHeaderSerializer::IcmpHeaderSerializer ( )

inline

: FieldsChunkSerializer() {}

Member Function Documentation

deserialize()

const Ptr< Chunk > inet::IcmpHeaderSerializer::deserialize ( MemoryInputStream &  stream ) const

overrideprotectedvirtual

Deserializes a chunk from a stream by reading the bytes at the current position of the stream.

The current stream position is updated according to the length of the returned chunk.

Implements inet::FieldsChunkSerializer.

{
    auto icmpHeader = makeShared<IcmpHeader>();
    IcmpType type = static_cast<IcmpType>(stream.readByte());
    icmpHeader->setType(type);
    icmpHeader->setCode(stream.readByte());
    icmpHeader->setChksum(stream.readUint16Be());
    icmpHeader->setCrcMode(CRC_COMPUTED);
    switch (type) {
        case ICMP_ECHO_REQUEST: {
            auto echoRq = makeShared<IcmpEchoRequest>();
            echoRq->setType(type);
            echoRq->setCode(icmpHeader->getCode());
            echoRq->setChksum(icmpHeader->getChksum());
            echoRq->setCrcMode(CRC_COMPUTED);
            echoRq->setIdentifier(stream.readUint16Be());
            echoRq->setSeqNumber(stream.readUint16Be());
            icmpHeader = echoRq;
            break;
        }
        case ICMP_ECHO_REPLY: {
            auto echoReply = makeShared<IcmpEchoReply>();
            echoReply->setType(type);
            echoReply->setCode(icmpHeader->getCode());
            echoReply->setChksum(icmpHeader->getChksum());
            echoReply->setCrcMode(CRC_COMPUTED);
            echoReply->setIdentifier(stream.readUint16Be());
            echoReply->setSeqNumber(stream.readUint16Be());
            icmpHeader = echoReply;
            break;
        }
        case ICMP_DESTINATION_UNREACHABLE:
            if (icmpHeader->getCode() == ICMP_DU_FRAGMENTATION_NEEDED) {
                auto icmpPtb = makeShared<IcmpPtb>();
                icmpPtb->setType(type);
                icmpPtb->setCode(icmpHeader->getCode());
                icmpPtb->setChksum(icmpHeader->getChksum());
                icmpPtb->setCrcMode(CRC_COMPUTED);
                icmpPtb->setUnused(stream.readUint16Be());
                icmpPtb->setMtu(stream.readUint16Be());
                icmpHeader = icmpPtb;
            }
            else
                stream.readUint32Be(); // unused
            break;
        case ICMP_TIME_EXCEEDED:
            stream.readUint32Be(); // unused
            break;
        default:
            EV_ERROR << "Can not parse ICMP packet: type " << type << " not supported.";
            icmpHeader->markImproperlyRepresented();
            break;
    }
    return icmpHeader;
}

serialize()

void inet::IcmpHeaderSerializer::serialize ( MemoryOutputStream &  stream, const Ptr< const Chunk > &  chunk  ) const

overrideprotectedvirtual

Serializes a chunk into a stream by writing all bytes representing the chunk at the end of the stream.

Implements inet::FieldsChunkSerializer.

{
    const auto& icmpHeader = staticPtrCast<const IcmpHeader>(chunk);
    stream.writeByte(icmpHeader->getType());
    stream.writeByte(icmpHeader->getCode());
    stream.writeUint16Be(icmpHeader->getChksum());
    switch (icmpHeader->getType()) {
        case ICMP_ECHO_REQUEST: {
            const auto& icmpEchoRq = CHK(dynamicPtrCast<const IcmpEchoRequest>(chunk));
            stream.writeUint16Be(icmpEchoRq->getIdentifier());
            stream.writeUint16Be(icmpEchoRq->getSeqNumber());
            break;
        }
        case ICMP_ECHO_REPLY: {
            const auto& icmpEchoReply = CHK(dynamicPtrCast<const IcmpEchoReply>(chunk));
            stream.writeUint16Be(icmpEchoReply->getIdentifier());
            stream.writeUint16Be(icmpEchoReply->getSeqNumber());
            break;
        }
        case ICMP_DESTINATION_UNREACHABLE:
            if (icmpHeader->getCode() == ICMP_DU_FRAGMENTATION_NEEDED) {
                if (const auto& icmpPtb = dynamicPtrCast<const IcmpPtb>(chunk)) {
                    stream.writeUint16Be(icmpPtb->getUnused()); // unused
                    stream.writeUint16Be(icmpPtb->getMtu()); // next hop MTU
                }
                else
                    stream.writeUint32Be(0);
            }
            else
                stream.writeUint32Be(0); // unused
            break;
        case ICMP_TIME_EXCEEDED:
            stream.writeUint32Be(0); // unused
            break;
        default:
            throw cRuntimeError("Can not serialize ICMP packet: type %d  not supported.", icmpHeader->getType());
    }
}

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The documentation for this class was generated from the following files:

• IcmpHeaderSerializer.h
• IcmpHeaderSerializer.cc