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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html><head>
<meta content="text/html; charset=iso-8859-1" http-equiv="Content-Type" /><title>Protocol Decodes: TCP</title><meta content="KompoZer" name="generator" /><link rel="stylesheet" type="text/css" href="plt-doc.css" /></head><body>
<h2>Transport Layer Decodes</h2>
<h3>Class TCP</h3>
<p>Provides access to fields in a TCP header.</p><table style="width: 614px; height: 1269px;" class="indent1">
<tbody>
<tr><td class="heading" colspan="2"><span style="font-weight: bold;">Instance Variables</span></td></tr><tr>
<td class="name methodwidth"><strong>src_port</strong></td>
<td class="name descriptionwidth"><em>tcp.src_port ->
anInteger</em></td>
</tr>
<tr>
<td class="description"><br />
</td>
<td class="description">Source Port (16-bit) </td>
</tr>
<tr>
<td class="name"><strong>dst_port</strong></td>
<td class="name"><em>tcp.dst_port ->
anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">Destination Port (16-bit) </td>
</tr>
<tr>
<td class="name"><strong>seq_nbr</strong></td>
<td class="name"><em>tcp.seq_nbr ->
anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">Sequence Number (32-bit) </td>
</tr>
<tr>
<td class="name"><strong>ack_nbr</strong></td>
<td class="name"><em>tcp.ack_nbr ->
anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">Acknowledgement Number
(32-bit) </td>
</tr>
<tr>
<td class="name"><strong>doff</strong></td>
<td class="name"><em>tcp.doff ->
anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">Data Offset (4-byte units);
header is doff*4 bytes long </td>
</tr>
<tr>
<td class="name"><strong>flags</strong></td>
<td class="name"><em>tcp.flags -> anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">12-bit integer, with the 6 flags below in its 6 low-order bits </td>
</tr>
<tr>
</tr><tr>
<td class="name"><strong>urg_flag</strong></td>
<td class="name"><em>tcp.urg_flag -> true
or false</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">True if 'Urgent' flag is 1 </td>
</tr>
<tr>
<td class="name"><strong>ack_flag</strong></td>
<td class="name"><em>tcp.ack_flag -> true
or false</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">True if 'Acknowledge' flag
is 1 </td>
</tr>
<tr>
<td class="name"><strong>psh_flag</strong></td>
<td class="name"><em>tcp.psh_flag -> true
or false</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">True if 'Push' flag is 1 </td>
</tr>
<tr>
<td class="name"><strong>rst_flag</strong></td>
<td class="name"><em>tcp.rst_flag -> true
or false</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">True if 'Reset'' flag is 1 </td>
</tr>
<tr>
<td class="name"><strong>syn_flag</strong></td>
<td class="name"><em>tcp.syn_flag -> true
or false</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">True if 'Synchronise' flag
is 1 </td>
</tr>
<tr>
<td class="name"><strong>fin_flag</strong></td>
<td class="name"><em>tcp.fin_flag -> true
or false</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">True if 'Finish' flag is 1 </td>
</tr>
<tr>
<td class="name"><strong>window</strong></td>
<td class="name"><em>tcp.window->
anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">Receive Window size </td>
</tr>
<tr>
<td class="name"><strong>checksum</strong></td>
<td class="name"><em>tcp.checksum ->
anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">TCP Checksum </td>
</tr>
<tr>
<td class="name"><strong>options_data</strong><br />
</td>
<td class="name">tcp.options_data-> aByteArray | False<br />
</td>
</tr>
<tr>
<td><br />
</td>
<td class="description">Bytearray containing the bytes of the TCP options part of the TCP header. Returns False if header has no TCP options<br />
</td>
</tr>
<tr>
<td class="name"><strong>option_numbers</strong><br />
</td>
<td class="name">tcp.option_numbers -> aCFFIArray | False</td>
</tr>
<tr>
<td><br />
</td>
<td class="description">Byterray containing the option numbers of all this header's TCP options. Returns False if header has no TCP options</td>
</tr>
<tr>
<td class="name"><strong>urg_ptr</strong></td>
<td class="name">tcp.urgent -> anInteger</td>
</tr>
<tr>
<td><br />
</td>
<td class="description">TCP Urgent Pointer </td>
</tr>
<tr>
<td class="name"><strong>payload</strong></td>
<td class="name">tcp.payload -> aPayloadObject</td>
</tr>
<tr>
<td><br />
</td>
<td class="description">None if tcp had no payload, otherwise<br />
an object containing the packet's TCP payload<br />
</td>
</tr>
</tbody></table>
<br /><table><tbody>
<tr><td class="heading" colspan="2"><span style="font-weight: bold;"><br />Instance Function<br />
</span></td></tr><tr>
<td class="name methodwidth"><strong>option</strong>(n)<br />
</td>
<td class="name descriptionwidth"><em>tcp.option(n) </em>-> aByteArray | True | False</td>
</tr>
<tr>
<td class="description"><br />
</td>
<td class="description">Bytearray containing option n's value bytes. <br />
Returns True if option n is present but has no value,<br />
or False if option n is not present in the header <br />
</td>
</tr>
</tbody></table>
<span style="font-weight: bold;"><p>Nevil Brownlee<br />Mon, 17 Jan 2017 (NZDT)</p></span></body></html>
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