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<title>Snort AI preprocessor module: Manage streams, sorting them into hash tables and linked lists</title>
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<a href="#func-members">Functions</a> </div>
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<h1>Manage streams, sorting them into hash tables and linked lists</h1> </div>
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<tr><td colspan="2"><h2><a name="func-members"></a>
Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">PRIVATE void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__stream.html#ga80016adf701c717a6ebfb5b15b8a5749">_AI_stream_free</a> (struct <a class="el" href="structpkt__info.html">pkt_info</a> *stream)</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Remove a stream from the hash table (private function). <a href="#ga80016adf701c717a6ebfb5b15b8a5749"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void *&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__stream.html#ga24b1131374e5059564b8a12380c4eb75">AI_hashcleanup_thread</a> (void *arg)</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Thread called for cleaning up the hash table from the traffic streams older than a certain threshold. <a href="#ga24b1131374e5059564b8a12380c4eb75"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__stream.html#ga7d71c5645b9baff7b6c4b9a181bf80c5">AI_pkt_enqueue</a> (SFSnortPacket *pkt)</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Function called for appending a new packet to the hash table, creating a new stream or appending it to an existing stream. <a href="#ga7d71c5645b9baff7b6c4b9a181bf80c5"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">struct <a class="el" href="structpkt__info.html">pkt_info</a> *&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__stream.html#ga2efedcabbfd12c5345f0c93a3dd4735c">AI_get_stream_by_key</a> (struct <a class="el" href="structpkt__key.html">pkt_key</a> key)</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Get a TCP stream by key. <a href="#ga2efedcabbfd12c5345f0c93a3dd4735c"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__stream.html#ga8749989cee2ac05a7de058faac280c02">AI_set_stream_observed</a> (struct <a class="el" href="structpkt__key.html">pkt_key</a> key)</td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Set the flag "observed" on a stream associated to a security alert, so that it won't be removed from the hash table. <a href="#ga8749989cee2ac05a7de058faac280c02"></a><br/></td></tr>
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<hr/><h2>Function Documentation</h2>
<a class="anchor" id="ga80016adf701c717a6ebfb5b15b8a5749"></a><!-- doxytag: member="stream.c::_AI_stream_free" ref="ga80016adf701c717a6ebfb5b15b8a5749" args="(struct pkt_info *stream)" -->
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<td class="memname">PRIVATE void _AI_stream_free </td>
<td>(</td>
<td class="paramtype">struct <a class="el" href="structpkt__info.html">pkt_info</a> *&nbsp;</td>
<td class="paramname"> <em>stream</em></td>
<td>&nbsp;)&nbsp;</td>
<td></td>
</tr>
</table>
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<p>Remove a stream from the hash table (private function). </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>stream</em>&nbsp;</td><td>Stream to be removed </td></tr>
</table>
</dd>
</dl>
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<a class="anchor" id="ga2efedcabbfd12c5345f0c93a3dd4735c"></a><!-- doxytag: member="stream.c::AI_get_stream_by_key" ref="ga2efedcabbfd12c5345f0c93a3dd4735c" args="(struct pkt_key key)" -->
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<td class="memname">struct <a class="el" href="structpkt__info.html">pkt_info</a>* AI_get_stream_by_key </td>
<td>(</td>
<td class="paramtype">struct <a class="el" href="structpkt__key.html">pkt_key</a>&nbsp;</td>
<td class="paramname"> <em>key</em></td>
<td>&nbsp;)&nbsp;</td>
<td><code> [read]</code></td>
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<p>Get a TCP stream by key. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>key</em>&nbsp;</td><td>Key of the stream to be picked up (struct <a class="el" href="structpkt__key.html">pkt_key</a>) </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>A <a class="el" href="structpkt__info.html">pkt_info</a> pointer to the stream if found, NULL otherwise </dd></dl>
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<a class="anchor" id="ga24b1131374e5059564b8a12380c4eb75"></a><!-- doxytag: member="stream.c::AI_hashcleanup_thread" ref="ga24b1131374e5059564b8a12380c4eb75" args="(void *arg)" -->
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<td class="memname">void* AI_hashcleanup_thread </td>
<td>(</td>
<td class="paramtype">void *&nbsp;</td>
<td class="paramname"> <em>arg</em></td>
<td>&nbsp;)&nbsp;</td>
<td></td>
</tr>
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<div class="memdoc">
<p>Thread called for cleaning up the hash table from the traffic streams older than a certain threshold. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>arg</em>&nbsp;</td><td>Pointer to the <a class="el" href="structAI__config.html">AI_config</a> struct </td></tr>
</table>
</dd>
</dl>
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</div>
<a class="anchor" id="ga7d71c5645b9baff7b6c4b9a181bf80c5"></a><!-- doxytag: member="stream.c::AI_pkt_enqueue" ref="ga7d71c5645b9baff7b6c4b9a181bf80c5" args="(SFSnortPacket *pkt)" -->
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<td class="memname">void AI_pkt_enqueue </td>
<td>(</td>
<td class="paramtype">SFSnortPacket *&nbsp;</td>
<td class="paramname"> <em>pkt</em></td>
<td>&nbsp;)&nbsp;</td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Function called for appending a new packet to the hash table, creating a new stream or appending it to an existing stream. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>pkt</em>&nbsp;</td><td>Packet to be appended </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="ga8749989cee2ac05a7de058faac280c02"></a><!-- doxytag: member="stream.c::AI_set_stream_observed" ref="ga8749989cee2ac05a7de058faac280c02" args="(struct pkt_key key)" -->
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<td class="memname">void AI_set_stream_observed </td>
<td>(</td>
<td class="paramtype">struct <a class="el" href="structpkt__key.html">pkt_key</a>&nbsp;</td>
<td class="paramname"> <em>key</em></td>
<td>&nbsp;)&nbsp;</td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Set the flag "observed" on a stream associated to a security alert, so that it won't be removed from the hash table. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>key</em>&nbsp;</td><td>Key of the stream to be set as "observed" </td></tr>
</table>
</dd>
</dl>
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