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Net::Packet::TCP(3) User Contributed Perl Documentation Net::Packet::TCP(3)

Net::Packet::TCP - Transmission Control Protocol layer 4 object 

   use Net::Packet::Consts qw(:tcp);
   require Net::Packet::TCP;

   # Build a layer
   my $layer = Net::Packet::TCP->new(
      dst     => 22,
      options => "\x02\x04\x05\xb4", # MSS=1460
   );
   $layer->pack;

   print 'RAW: '.unpack('H*', $layer->raw)."\n";

   # Read a raw layer
   my $layer = Net::Packet::TCP->new(raw => $raw);

   print $layer->print."\n";
   print 'PAYLOAD: '.unpack('H*', $layer->payload)."\n"
      if $layer->payload;

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.

src
dst
Source and destination ports.
flags
TCP flags, see CONSTANTS.
win
The window size.
seq
ack
Sequence and acknowledgment numbers.
off
The size in number of words of the TCP header.
x2
Reserved field.
checksum
The TCP header checksum.
urp
Urgent pointer.
options
TCP options, as a hexadecimal string.

new
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: ""

recv
Will search for a matching replies in framesSorted or frames from a Net::Packet::Dump object.
pack
Packs all attributes into a raw format, in order to inject to network. Returns 1 on success, undef otherwise.
unpack
Unpacks raw data from network and stores attributes into the object. Returns 1 on success, undef otherwise.
getHeaderLength
Returns the header length in bytes, not including TCP options.
getOptionsLength
Returns options length in bytes.
haveFlagFin
haveFlagSyn
haveFlagRst
haveFlagPsh
haveFlagAck
haveFlagUrg
haveFlagEce
haveFlagCwr
Returns 1 if the specified TCP flag is set in flags attribute, 0 otherwise.

Load them: use Net::Packet::Consts qw(:tcp);
NP_TCP_FLAG_FIN
NP_TCP_FLAG_SYN
NP_TCP_FLAG_RST
NP_TCP_FLAG_PSH
NP_TCP_FLAG_ACK
NP_TCP_FLAG_URG
NP_TCP_FLAG_ECE
NP_TCP_FLAG_CWR
TCP flag constants.

Patrice <GomoR> Auffret

Copyright (c) 2004-2009, Patrice <GomoR> Auffret

You may distribute this module under the terms of the Artistic license. See LICENSE.Artistic file in the source distribution archive.

NetPacket, Net::RawIP, Net::RawSock

Hey! The above document had some coding errors, which are explained below:
Around line 309:
Non-ASCII character seen before =encoding in '# Build'. Assuming CP1252
2009-11-09 perl v5.32.1
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