PacketFilter Class Reference
[Network Data Structures]

#include <PacketFilter.h>

Inheritance diagram for PacketFilter:

List of all members.

Public Member Functions
virtual PacketFilter *	clone (void) const =0
virtual bool	match (const TraceIterator &pkt) const =0
	Match a packet against a packet filter.
virtual bool	match (const StreamKey &key) const =0
	Match a StreamKey representing a Trace against a packet filter.
virtual std::string	toString (void) const =0
Static Public Member Functions
static PacketFilter *	parse (const std::string &filterString)
Friends
std::ostream &	operator<< (std::ostream &os, const PacketFilter &filter)

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Detailed Description

A packet filter is used to describe a set of packets; e.g. for selecting a subset of packets from an aggregate. Filters are generally based on Ethereal packet filtering syntax.

Filtering is only permitted on intrinsic attributes; that is, attributes that can be computed from the packet itself, devoid of any context. e.g. filtering on frame.time_delta is not currently supported. This is because trying to deal with relative attributes in this architecture will be bloody difficult.

PacketFilter is an abstract (pure virtual) class which defines the interface to its subclasses.

Examples:

profile_streams_thesis.cc, and test_harness.cc.

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Member Function Documentation

virtual bool PacketFilter::match (  const StreamKey &  key  )  const [pure virtual]

Match a StreamKey representing a Trace against a packet filter. Used to determine if all packets in a Trace are guaranteed to match the filter. Implemented in SimplePacketFilter, CompoundPacketFilter, and ConsecutivePacketFilter.

virtual bool PacketFilter::match (  const TraceIterator &  pkt  )  const [pure virtual]

Match a packet against a packet filter. Match is done against a TraceIterator (a custom iterator defined relative to a Trace) so that the filter has access to relative features (e.g. frame.time_delta) Implemented in SimplePacketFilter, CompoundPacketFilter, and ConsecutivePacketFilter. Examples: test_harness.cc.

PacketFilter * PacketFilter::parse (  const std::string &  filterString  )  [static]

parser to generate packet filters from a filter string Returns: pointer to a new PacketFilter (allocated using new; caller is responsible for deallocating when finished)

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

• data_structures/PacketFilter.h
• data_structures/PacketFilter.cc

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