NAME¶
NetPacket::Ethernet - Assemble and disassemble ethernet packets.
VERSION¶
version 1.3.0
SYNOPSIS¶
use NetPacket::Ethernet;
$eth_obj = NetPacket::Ethernet->decode($raw_pkt);
$eth_pkt = NetPacket::Ethernet->encode(params...); # Not implemented
$eth_data = NetPacket::Ethernet::strip($raw_pkt);
DESCRIPTION¶
"NetPacket::Ethernet" provides a set of routines for assembling and
disassembling packets using the Ethernet protocol.
Methods¶
- "NetPacket::Ethernet->decode([RAW
PACKET])"
- Decode the raw packet data given and return an object
containing instance data. This method will quite happily decode garbage
input. It is the responsibility of the programmer to ensure valid packet
data is passed to this method.
- "NetPacket::Ethernet->encode(param =>
value)"
- Return an ethernet packet encoded with the instance data
specified. Not implemented.
Functions¶
- "NetPacket::Ethernet::strip([RAW PACKET])"
- Return the encapsulated data (or payload) contained in the
ethernet packet. This data is suitable to be used as input for other
"NetPacket::*" modules.
This function is equivalent to creating an object using the
"decode()" constructor and returning the "data" field
of that object.
Instance data¶
The instance data for the "NetPacket::Ethernet" object consists of the
following fields.
- src_mac
- The source MAC address for the ethernet packet as a hex
string.
- dest_mac
- The destination MAC address for the ethernet packet as a
hex string.
- type
- The protocol type for the ethernet packet.
- data
- The payload for the ethernet packet.
Exports¶
- default
- none
- exportable
- ETH_TYPE_IP ETH_TYPE_ARP ETH_TYPE_APPLETALK ETH_TYPE_SNMP
ETH_TYPE_IPv6 ETH_TYPE_PPP
- tags
- The following tags group together related exportable
items.
- ":types"
- ETH_TYPE_IP ETH_TYPE_ARP ETH_TYPE_APPLETALK ETH_TYPE_SNMP
ETH_TYPE_IPv6 ETH_TYPE_PPP
- ":strip"
- Import the strip function "eth_strip" which is an
alias for "NetPacket::Ethernet::strip"
- ":ALL"
- All the above exportable items.
EXAMPLE¶
The following script dumps ethernet frames by mac address and protocol to
standard output.
#!/usr/bin/perl -w
use strict;
use Net::PcapUtils;
use NetPacket::Ethernet;
sub process_pkt {
my($arg, $hdr, $pkt) = @_;
my $eth_obj = NetPacket::Ethernet->decode($pkt);
print("$eth_obj->{src_mac}:$eth_obj->{dest_mac} $eth_obj->{type}\n");
}
Net::PcapUtils::loop(\&process_pkt);
TODO¶
- Implement "encode()" function
COPYRIGHT¶
Copyright (c) 2001 Tim Potter and Stephanie Wehner.
Copyright (c) 1995,1996,1997,1998,1999 ANU and CSIRO on behalf of the
participants in the CRC for Advanced Computational Systems ('ACSys').
This module is free software. You can redistribute it and/or modify it under the
terms of the Artistic License 2.0.
This program is distributed in the hope that it will be useful, but without any
warranty; without even the implied warranty of merchantability or fitness for
a particular purpose.
AUTHOR¶
Tim Potter <tpot@samba.org>