Library: Net
Package: ICMP
Header: Poco/Net/ICMPPacketImpl.h
Description
This is the abstract class for ICMP packet implementations.
Inheritance
Known Derived Classes: ICMPv4PacketImpl
Member Summary
Member Functions: checksum, errorDescription, getDataSize, initPacket, maxPacketSize, nextSequence, packet, packetSize, resetSequence, sequence, setDataSize, time, typeDescription, validReplyID
Constructors
ICMPPacketImpl
ICMPPacketImpl(
int dataSize = 48
);
Constructor. Creates an ICMPPacketImpl.
Destructor
~ICMPPacketImpl 
virtual ~ICMPPacketImpl();
Destructor.
Member Functions
errorDescription
virtual std::string errorDescription(
Poco::UInt8 * buffer,
int length,
int & type,
int & code
) = 0;
Returns error description string. If supplied buffer contains an ICMP echo reply packet, an empty string is returned indicating the absence of error. If type and code of the error can be determined, they are assigned to the type and code respectively.
Supplied buffer includes IP header, ICMP header and data. Must be overridden.
getDataSize
int getDataSize() const;
Returns data size.
maxPacketSize 
virtual int maxPacketSize() const;
Returns the maximum permitted size of packet in number of octets.
packet
const Poco::UInt8 * packet(
bool init = true
);
Returns raw ICMP packet. ICMP header and data are included in the packet. If init is true, initPacket() is called.
packetSize
virtual int packetSize() const = 0;
Returns the total size of packet (ICMP header + data) in number of octets. Must be overridden.
sequence
Poco::UInt16 sequence() const;
Returns the most recent sequence number generated.
setDataSize
void setDataSize(
int dataSize
);
Sets data size.
time
virtual struct timeval time(
Poco::UInt8 * buffer = 0,
int length = 0
) const = 0;
Returns current epoch time if either argument is equal to zero. Otherwise, it extracts the time value from the supplied buffer.
Supplied buffer includes IP header, ICMP header and data. Must be overridden.
typeDescription
virtual std::string typeDescription(
int typeId
) = 0;
Returns the description of the packet type. Must be overridden.
validReplyID
virtual bool validReplyID(
unsigned char * buffer,
int length
) const = 0;
Returns true if the extracted id is recognized (i.e. equals the process id).
Supplied buffer includes IP header, ICMP header and data. Must be overridden.
checksum 
Poco::UInt16 checksum(
Poco::UInt16 * addr,
Poco::Int32 len
);
Calculates the checksum for supplied buffer.
initPacket
virtual void initPacket() = 0;
(Re)assembles the packet. Must be overridden.
nextSequence
Poco::UInt16 nextSequence();
Increments sequence number and returns the new value.
resetSequence
void resetSequence();
Resets the sequence to zero.
Variables
MAX_PACKET_SIZE 
static const Poco::UInt16 MAX_PACKET_SIZE;
MAX_PAYLOAD_SIZE
static const Poco::UInt16 MAX_PAYLOAD_SIZE;
MAX_SEQ_VALUE
static const Poco::UInt16 MAX_SEQ_VALUE;