1NetPacket(3)          User Contributed Perl Documentation         NetPacket(3)
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NAME

6       NetPacket - assemble/disassemble network packets at the protocol level
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VERSION

9       version 1.7.2
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SYNOPSIS

12           # NetPacket is a base class only
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DESCRIPTION

15       "NetPacket" provides a base class for a cluster of modules related to
16       decoding and encoding of network protocols.  Each "NetPacket"
17       descendent module knows how to encode and decode packets for the
18       network protocol it implements.  Consult the documentation for the
19       module in question for protocol-specific implementation.
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21       Note that there is no inheritance in the "NetPacket::" cluster of
22       modules other than each protocol module being a "NetPacket".  This was
23       seen to be too restrictive as imposing inheritance relationships (for
24       example between the IP, UDP and TCP protocols) would make things like
25       tunneling or other unusual situations difficult.
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WRITING YOUR OWN "NetPacket::" MODULE

28       You are encouraged to write additional "NetPacket::" modules as well as
29       improve existing ones.  Contact the maintainer of the module in
30       question with your suggestions or changes.
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32       The following sections are a list of suggestions and conventions for
33       writing a "NetPacket::" module.
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35   Naming Conventions
36       When creating a module in the "NetPacket::" namespace, it is suggested
37       that you stick to a couple of conventions when naming packet contents.
38       This will hopefully lead to a consistent namespace making the
39       "NetPacket::" easier to use.
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41       Content names are all lowercase, with underscores separating multiple
42       words.  The following abbreviations are recommended:
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44                   Word                Abbreviation
45                   --------------------------------
46                   source              src
47                   destination         dest
48                   checksum            cksum
49                   identifier          id
50                   version             ver
51                   protocol            proto
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53   Required Methods
54       encode(), decode(), strip()
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56   Required Fields
57       Every NetPacket:: object should have the following fields.
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59       _parent
60           A link to the parent "NetPacket::" object in which this
61           "NetPacket::" object is encaulated.  This field is undefined if
62           there is no parent object.
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64       _frame
65           A copy of the raw data of the packet.
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67       data
68           This field should contain the data encapsulated in the packet (i.e
69           any headers or trailers stripped off) or undef if the packet
70           contains no data.  Note that in this sense, "data" is taken to mean
71           information not relevant to the particular protocol being decoded.
72           For example, an ARP packet contains many header fields but no data.
73           A UDP datagram, however contains header fields and a payload.
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SEE ALSO

76       Joel Knight has a patch for NetPacket for IPv6 support available at
77       http://www.packetmischief.ca/code/netpacket/.
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80       Copyright (c) 2001 Tim Potter and Stephanie Wehner.
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82       Copyright (c) 1995,1996,1997,1998,1999 ANU and CSIRO on behalf of the
83       participants in the CRC for Advanced Computational Systems ('ACSys').
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85       This module is free software.  You can redistribute it and/or modify it
86       under the terms of the Artistic License 2.0.
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88       This program is distributed in the hope that it will be useful, but
89       without any warranty; without even the implied warranty of
90       merchantability or fitness for a particular purpose.
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AUTHORS

93       Tim Potter <tpot@samba.org>
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95       Stephanie Wehner <atrak@itsx.com>
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97       Yanick Champoux <yanick@cpan.org>
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101perl v5.34.0                      2021-07-22                      NetPacket(3)
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