Net::Packet::TCP - Transmission Control Protocol layer 4 object
use Net::Packet::TCP;
# Build layer to inject to network
my $tcp = Net::Packet::TCP->new(
dst => 22,
options => "\x02\x04\x05\xb4", # MSS=1460
);
# Decode from network to create the object
# Usually, you do not use this, it is used by Net::Packet::Frame
my $tcp2 = Net::Packet::TCP->new(raw => $rawFromNetwork);
print $tcp->print, "\n";
This modules implements the encoding and decoding of the TCP layer.
RFC: ftp://ftp.rfc-editor.org/in-notes/rfc793.txt
See also Net::Packet::Layer and Net::Packet::Layer4 for other attributes and methods.
Source and destination ports.
TCP flags, see CONSTANTS.
The window size.
Sequence and acknowledgment numbers.
The size in number of words of the TCP header.
Reserved field.
The TCP header checksum.
Urgent pointer.
TCP options, as a hexadecimal string.
Object constructor. You can pass attributes that will overwrite default ones. Default values:
src: getRandomHighPort()
dst: 0
seq: getRandom32bitsInt()
ack: 0
x2: 0
off: 0
flags: NP_TCP_FLAG_SYN
win: 0xffff
checksum: 0
urp: 0
options: ""
Will search for a matching replies in framesSorted or frames from a Net::Packet::Dump object.
Packs all attributes into a raw format, in order to inject to network. Returns 1 on success, undef otherwise.
Unpacks raw data from network and stores attributes into the object. Returns 1 on success, undef otherwise.
Returns the header length in bytes, not including TCP options.
Returns options length in bytes.
Returns 1 if the specified TCP flag is set in flags attribute, 0 otherwise.
Load them: use Net::Packet::Consts qw(:tcp);
TCP flag constants.
Patrice <GomoR> Auffret
Copyright (c) 2004-2005, Patrice <GomoR> Auffret
You may distribute this module under the terms of the Artistic license. See Copying file in the source distribution archive.
