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NetPacket (3)
  • >> NetPacket (3) ( Разные man: Библиотечные вызовы )
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    NAME

    "NetPacket" - modules to assemble/disassemble network packets at the
    protocol level.
     
    

    SYNOPSIS

        # NetPacket is a base class only
    
    
     

    DESCRIPTION

    "NetPacket" provides a base class for a cluster of modules related to decoding and encoding of network protocols. Each "NetPacket" descendent module knows how to encode and decode packets for the network protocol it implements. Consult the documentation for the module in question for protocol-specific implementation.

    Note that there is no inheritance in the "NetPacket::" cluster of modules other than each protocol module being a "NetPacket". This was seen to be too restrictive as imposing inheritance relationships (for example between the IP, UDP and TCP protocols) would make things like tunneling or other unusual situations difficult.  

    WRITING YOUR OWN NetPacket:: MODULE

    You are encouraged to write additional "NetPacket::" modules as well as improve existing ones. Contact the maintainer of the module in question with your suggestions or changes.

    The following sections are a list of suggestions and conventions for writing a "NetPacket::" module.  

    Naming Conventions

    When creating a module in the "NetPacket::" namespace, it is suggested that you stick to a couple of conventions when naming packet contents. This will hopefully lead to a consistent namespace making the "NetPacket::" easier to use.

    Content names are all lowercase, with underscores separating multiple words. The following abbreviations are recommended:

                Word                Abbreviation
                --------------------------------
                source              src
                destination         dest
                checksum            cksum
                identifier          id
                version             ver
                protocol            proto
    
    
     

    Required Methods

    encode(), decode(), strip()  

    Required Fields

    Every NetPacket:: object should have the following fields.
    _parent
    A link to the parent "NetPacket::" object in which this "NetPacket::" object is encaulated. This field is undefined if there is no parent object.
    _frame
    A copy of the raw data of the packet.
    data
    This field should contain the data encapsulated in the packet (i.e any headers or trailers stripped off) or undef if the packet contains no data. Note that in this sense, ``data'' is taken to mean information not relevant to the particular protocol being decoded. For example, an ARP packet contains many header fields but no data. A UDP datagram, however contains header fields and a payload.
     

    Tags

     

    COPYRIGHT

      Copyright (c) 2001 Tim Potter.
    
    

      This package is free software and is provided "as is" without express 
      or implied warranty.  It may be used, redistributed and/or modified 
      under the terms of the Perl Artistic License (see
      http://www.perl.com/perl/misc/Artistic.html)
    
    

      Copyright (c) 1995,1996,1997,1998,1999 ANU and CSIRO on behalf of 
      the participants in the CRC for Advanced Computational Systems
      ('ACSys').
    
    

      ACSys makes this software and all associated data and documentation
      ('Software') available free of charge.  You may make copies of the 
      Software but you must include all of this notice on any copy.
    
    

      The Software was developed for research purposes and ACSys does not
      warrant that it is error free or fit for any purpose.  ACSys
      disclaims any liability for all claims, expenses, losses, damages
      and costs any user may incur as a result of using, copying or
      modifying the Software.
    
    
     

    AUTHOR

    Tim Potter <tpot@samba.org>

    Stephanie Wehner <atrak@itsx.com>


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    WRITING YOUR OWN NetPacket:: MODULE
    Naming Conventions
    Required Methods
    Required Fields
    Tags
    COPYRIGHT
    AUTHOR


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