"NetPacket::ARP" - Assemble and disassemble ARP (Address Resolution Protocol) packets. use NetPacket::ARP; $tcp_obj = NetPacket::ARP->decode($raw_pkt); $tcp_pkt = NetPacket::ARP->encode(params...); # Not implemented "NetPacket::ARP" provides a set of routines for assembling and disassembling packets using ARP (Address Resolution 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 a ARP packet encoded with the instance data specified. Not implemented.

Functions
Return the encapsulated data (or payload) contained in the TCP packet. Since no payload data is encapulated in an ARP packet (only instance data), this function returns undef.

Instance data
The instance data for the "NetPacket::ARP" object consists of the following fields. Hardware type. Protocol type. Header length. Protocol length. One of the following constants: ARP_OPCODE_REQUEST ARP_OPCODE_REPLY RARP_OPCODE_REQUEST RARP_OPCODE_REPLY Source hardware address. Source protocol address. Target hardware address. Target protocol address.

Exports
none none The following tags group together related exportable items. All the above exportable items. Print out arp requests on the local network. #!/usr/bin/perl -w use Net::PcapUtils; use NetPacket::Ethernet qw(:types); use NetPacket::ARP; sub process_pkt { my ($arg, $hdr, $pkt) = @_; my $eth_obj = NetPacket::Ethernet->decode($pkt); if ($eth_obj->{type} == ETH_TYPE_ARP) { my $arp_obj = NetPacket::ARP->decode($eth_obj->{data}, $eth_obj); print("source hw addr=$arp_obj->{sha}, " . "dest hw addr=$arp_obj->{tha}\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>