Net::Frame::Layer::TCP - Transmission Control Protocol layer object

srcdst Source and destination ports.

       flags
           TCP flags, see CONSTANTS.

       win The window size.

       seqack 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.

       The following are inherited attributes. See Net::Frame::Layer for more information.

       rawpayloadnextLayer

       Patrice <GomoR> Auffret

       Load them: use Net::Frame::Layer::TCP qw(:consts);

       NF_TCP_FLAGS_FINNF_TCP_FLAGS_SYNNF_TCP_FLAGS_RSTNF_TCP_FLAGS_PSHNF_TCP_FLAGS_ACKNF_TCP_FLAGS_URGNF_TCP_FLAGS_ECENF_TCP_FLAGS_CWR
           TCP flags constants.

       Copyright (c) 2006-2019, Patrice <GomoR> Auffret

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

perl v5.36.0                                       2022-12-04                        Net::Frame::Layer::TCP(3pm)

       This modules implements the encoding and decoding of the TCP layer.

       RFC: ftp://ftp.rfc-editor.org/in-notes/rfc793.txt

       See also Net::Frame::Layer for other attributes and methods.

newnew (hash)
           Object  constructor.  You  can  pass  attributes  that  will overwrite default ones. See SYNOPSIS for
           default values.

       getHeaderLength
           Returns the header length in bytes, not including TCP options.

       getOptionsLength
           Returns options length in bytes.

       computeLengths
           Computes various lengths contained within this layer.

       computeChecksums ({ type => PROTO, src => IP, dst => IP })
           In order to compute checksums of TCP, you need to pass the protocol type (IPv4, IPv6), the source and
           destination IP addresses (IPv4 for IPv4, IPv6 for IPv6).

       getKeygetKeyReverse
           These  two  methods  are  basically  used  to  increase  the  speed  when  using  recv  method   from
           Net::Frame::Simple. Usually, you write them when you need to write match method.

       match (Net::Frame::Layer::TCP object)
           This method is mostly used internally. You pass a Net::Frame::Layer::TCP layer as a parameter, and it
           returns true if this is a response corresponding for the request, or returns false if not.

       The  following  are  inherited methods. Some of them may be overridden in this layer, and some others may
       not be meaningful in this layer. See Net::Frame::Layer for more information.

       layercomputeLengthscomputeChecksumspackunpackencapsulategetLengthgetPayloadLengthprintdump

       Net::Frame::Layer::TCP - Transmission Control Protocol layer object

       Net::Frame::Layer

          use Net::Frame::Layer::TCP qw(:consts);

          # Build a layer
          my $layer = Net::Frame::Layer::TCP->new(
             src      => getRandomHighPort(),
             dst      => 0,
             seq      => getRandom32bitsInt(),
             ack      => 0,
             x2       => 0,
             off      => 0,
             flags    => NF_TCP_FLAGS_SYN,
             win      => 0xffff,
             checksum => 0,
             urp      => 0,
             options  => '',
          );
          $layer->pack;

          print 'RAW: '.$layer->dump."\n";

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

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