NAME¶
Net::Frame::Simple - frame crafting made easy
SYNOPSIS¶
# We build a TCP SYN
my $src = '192.168.0.10';
my $target = '192.168.0.1';
my $port = 22;
use Net::Frame::Simple;
use Net::Frame::Layer::IPv4;
use Net::Frame::Layer::TCP;
my $ip4 = Net::Frame::Layer::IPv4->new(
src => $src,
dst => $target,
);
my $tcp = Net::Frame::Layer::TCP->new(
dst => $port,
options => "\x02\x04\x54\x0b",
payload => 'test',
);
my $oSimple = Net::Frame::Simple->new(
layers => [ $ip4, $tcp ],
);
# Now, the frame is ready to be send to the network
# We open a sender object, and a retriever object
use Net::Write::Layer3;
use Net::Frame::Dump::Online;
my $oWrite = Net::Write::Layer3->new(dst => $target);
my $oDump = Net::Frame::Dump::Online->new(dev => $oDevice->dev);
$oDump->start;
$oWrite->open;
# We send the frame
$oSimple->send($oWrite);
# And finally, waiting for the response
until ($oDump->timeout) {
if (my $recv = $oSimple->recv($oDump)) {
print "RECV:\n".$recv->print."\n";
last;
}
}
$oWrite->close;
$oDump->stop;
DESCRIPTION¶
This module is part of
Net::Frame frame crafting framework. It is totally
optional, but can make playing with the network far easier.
Basically, it hides the complexity of frame forging, sending, and receiving, by
providing helper methods, which will analyze internally how to assemble frames
and find responses to probes.
For example, it will take care of computing lengths and checksums, and matching
a response frame to the requesting frame.
ATTRIBUTES¶
- raw
- Where the packed frame will be stored, or used to unpack a raw string
taken from the network (or elsewhere).
- timestamp
- The frame timestamp.
- firstLayer
- We cannot know by which layer a frame begins, so this tells how to start
unpacking a raw data.
- padding
- Sometimes, frames are padded to achieve 60 bytes in length. The padding
will be stored here, or if you craft a frame, you can manually add your
own padding.
- reply
- When the recv method is called, and a corresponding reply has been
found, it is stored here.
- layers
- This one is an arrayref. It will store all layers to use within the
Net::Frame::Simple object.
- ref
- This is a hashref that stores all layers. The key is the layer type
(example: TCP: $oSimple->ref->{TCP}). If the frame contains multiple
layers of the same type, only the one found at upper level will be kept
(in fact, the latest analyzed one, aka LIFO).
METHODS¶
- new (hash)
- Object constructor. You can pass attributes in a hash as a parameter. Also
note that when you call it with layers attribute set, it will
automatically call computeLengths, computeChecksums and
pack for you. And when you pass raw attribute, it will call
unpack for you too, building layers and storing them in
layers attribute.
- newFromDump (hashref)
- When Net::Frame::Dump next method is called, and there is a
frame waiting, it returns a hashref with specific values. You can directly
use it as a parameter for this method, which will create a new
Net::Frame::Simple object.
- computeLengths
- This one hides the manual hassle of calling computeLengths method
for each layers. It takes no parameter, it will know internally what to
do.
- computeChecksums
- Same as above, but for checksums. you MUST call the previous one before
this one.
- pack
- Will pack all layers to to raw attribute, ready to be sent to the
network.
- unpack
- Will unpack a raw string from the raw attribute into respective
layers.
- getKey
- getKeyReverse
- These two methods are basically used to increase the speed when using
recv method.
- recv (Net::Frame::Dump object)
- When you want to search for the response of your probe, you call it by
specifying from which Net::Frame::Dump object to search. It then
returns a Net::Frame::Simple object if a match is found, or undef
if not.
- send (Net::Write object)
- Will send to the Net::Write object the raw string describing the
Net::Frame::Simple object.
- reSend (Net::Write object)
- You can also reSend the frame, it will only rewrite it to the
network if no reply has already been found.
- print
- Prints all layers in human readable format.
- dump
- Dumps the raw string in hexadecimal format.
SEE ALSO¶
Net::Write, Net::Frame::Dump
AUTHOR¶
Patrice <GomoR> Auffret
COPYRIGHT AND LICENSE¶
Copyright (c) 2006-2012, Patrice <GomoR> Auffret
You may distribute this module under the terms of the Artistic license. See
LICENSE.Artistic file in the source distribution archive.