"NetPacket::Ethernet" - Assemble and disassemble ethernet packets. 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); "NetPacket::Ethernet" provides a set of routines for assembling and disassembling packets using the Ethernet protocol.

Methods
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. Return an ethernet packet encoded with the instance data specified. Not implemented.

Functions
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. The source MAC address for the ethernet packet as a hex string. The destination MAC address for the ethernet packet as a hex string. The protocol type for the ethernet packet. The payload for the ethernet packet.

Exports
none ETH_TYPE_IP ETH_TYPE_ARP ETH_TYPE_APPLETALK ETH_TYPE_SNMP ETH_TYPE_IPv6 ETH_TYPE_PPP The following tags group together related exportable items. ETH_TYPE_IP ETH_TYPE_ARP ETH_TYPE_APPLETALK ETH_TYPE_SNMP ETH_TYPE_IPv6 ETH_TYPE_PPP Import the strip function "eth_strip" which is an alias for "NetPacket::Ethernet::strip" All the above exportable items. 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); 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. Tim Potter <tpot@samba.org>