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-<!--
- - Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
- - Copyright (C) 2000, 2001 Internet Software Consortium.
- -
- - Permission to use, copy, modify, and distribute this software for any
- - purpose with or without fee is hereby granted, provided that the above
- - copyright notice and this permission notice appear in all copies.
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- - THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
- - REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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- - INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
- - LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
- - OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
- - PERFORMANCE OF THIS SOFTWARE.
--->
-<!-- $Id: lwres_gabn.html,v 1.7.18.17 2007/01/30 00:23:45 marka Exp $ -->
-<html>
-<head>
-<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
-<title>lwres_gabn</title>
-<meta name="generator" content="DocBook XSL Stylesheets V1.71.1">
-</head>
-<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" lang="en">
-<a name="id2476275"></a><div class="titlepage"></div>
-<div class="refnamediv">
-<h2>Name</h2>
-<p>lwres_gabnrequest_render, lwres_gabnresponse_render, lwres_gabnrequest_parse, lwres_gabnresponse_parse, lwres_gabnresponse_free, lwres_gabnrequest_free &#8212; lightweight resolver getaddrbyname message handling</p>
-</div>
-<div class="refsynopsisdiv">
-<h2>Synopsis</h2>
-<div class="funcsynopsis">
-<pre class="funcsynopsisinfo">#include &lt;lwres/lwres.h&gt;</pre>
-<table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em">
-<tr>
-<td><code class="funcdef">
-lwres_result_t
-<b class="fsfunc">lwres_gabnrequest_render</b>(</code></td>
-<td>lwres_context_t * </td>
-<td>
-<var class="pdparam">ctx</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>lwres_gabnrequest_t * </td>
-<td>
-<var class="pdparam">req</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>lwres_lwpacket_t * </td>
-<td>
-<var class="pdparam">pkt</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>lwres_buffer_t * </td>
-<td>
-<var class="pdparam">b</var><code>)</code>;</td>
-</tr>
-</table>
-<table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em">
-<tr>
-<td><code class="funcdef">
-lwres_result_t
-<b class="fsfunc">lwres_gabnresponse_render</b>(</code></td>
-<td>lwres_context_t * </td>
-<td>
-<var class="pdparam">ctx</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>lwres_gabnresponse_t * </td>
-<td>
-<var class="pdparam">req</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>lwres_lwpacket_t * </td>
-<td>
-<var class="pdparam">pkt</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>lwres_buffer_t * </td>
-<td>
-<var class="pdparam">b</var><code>)</code>;</td>
-</tr>
-</table>
-<table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em">
-<tr>
-<td><code class="funcdef">
-lwres_result_t
-<b class="fsfunc">lwres_gabnrequest_parse</b>(</code></td>
-<td>lwres_context_t * </td>
-<td>
-<var class="pdparam">ctx</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>lwres_buffer_t * </td>
-<td>
-<var class="pdparam">b</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>lwres_lwpacket_t * </td>
-<td>
-<var class="pdparam">pkt</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>lwres_gabnrequest_t ** </td>
-<td>
-<var class="pdparam">structp</var><code>)</code>;</td>
-</tr>
-</table>
-<table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em">
-<tr>
-<td><code class="funcdef">
-lwres_result_t
-<b class="fsfunc">lwres_gabnresponse_parse</b>(</code></td>
-<td>lwres_context_t * </td>
-<td>
-<var class="pdparam">ctx</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>lwres_buffer_t * </td>
-<td>
-<var class="pdparam">b</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>lwres_lwpacket_t * </td>
-<td>
-<var class="pdparam">pkt</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>lwres_gabnresponse_t ** </td>
-<td>
-<var class="pdparam">structp</var><code>)</code>;</td>
-</tr>
-</table>
-<table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em">
-<tr>
-<td><code class="funcdef">
-void
-<b class="fsfunc">lwres_gabnresponse_free</b>(</code></td>
-<td>lwres_context_t * </td>
-<td>
-<var class="pdparam">ctx</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>lwres_gabnresponse_t ** </td>
-<td>
-<var class="pdparam">structp</var><code>)</code>;</td>
-</tr>
-</table>
-<table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
-<tr>
-<td><code class="funcdef">
-void
-<b class="fsfunc">lwres_gabnrequest_free</b>(</code></td>
-<td>lwres_context_t * </td>
-<td>
-<var class="pdparam">ctx</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>lwres_gabnrequest_t ** </td>
-<td>
-<var class="pdparam">structp</var><code>)</code>;</td>
-</tr>
-</table>
-</div>
-</div>
-<div class="refsect1" lang="en">
-<a name="id2543522"></a><h2>DESCRIPTION</h2>
-<p>
- These are low-level routines for creating and parsing
- lightweight resolver name-to-address lookup request and
- response messages.
- </p>
-<p>
- There are four main functions for the getaddrbyname opcode.
- One render function converts a getaddrbyname request structure &#8212;
- <span class="type">lwres_gabnrequest_t</span> &#8212;
- to the lighweight resolver's canonical format.
- It is complemented by a parse function that converts a packet in this
- canonical format to a getaddrbyname request structure.
- Another render function converts the getaddrbyname response structure
- &#8212; <span class="type">lwres_gabnresponse_t</span> &#8212;
- to the canonical format.
- This is complemented by a parse function which converts a packet in
- canonical format to a getaddrbyname response structure.
- </p>
-<p>
- These structures are defined in
- <code class="filename">&lt;lwres/lwres.h&gt;</code>.
- They are shown below.
- </p>
-<pre class="programlisting">
-#define LWRES_OPCODE_GETADDRSBYNAME 0x00010001U
-</pre>
-<p>
- </p>
-<pre class="programlisting">
-typedef struct lwres_addr lwres_addr_t;
-typedef LWRES_LIST(lwres_addr_t) lwres_addrlist_t;
-</pre>
-<p>
- </p>
-<pre class="programlisting">
-typedef struct {
- lwres_uint32_t flags;
- lwres_uint32_t addrtypes;
- lwres_uint16_t namelen;
- char *name;
-} lwres_gabnrequest_t;
-</pre>
-<p>
- </p>
-<pre class="programlisting">
-typedef struct {
- lwres_uint32_t flags;
- lwres_uint16_t naliases;
- lwres_uint16_t naddrs;
- char *realname;
- char **aliases;
- lwres_uint16_t realnamelen;
- lwres_uint16_t *aliaslen;
- lwres_addrlist_t addrs;
- void *base;
- size_t baselen;
-} lwres_gabnresponse_t;
-</pre>
-<p>
- </p>
-<p><code class="function">lwres_gabnrequest_render()</code>
- uses resolver context <em class="parameter"><code>ctx</code></em> to convert
- getaddrbyname request structure <em class="parameter"><code>req</code></em> to
- canonical format. The packet header structure
- <em class="parameter"><code>pkt</code></em> is initialised and transferred to
- buffer <em class="parameter"><code>b</code></em>.
-
- The contents of <em class="parameter"><code>*req</code></em> are then appended to
- the buffer in canonical format.
- <code class="function">lwres_gabnresponse_render()</code> performs the
- same task, except it converts a getaddrbyname response structure
- <span class="type">lwres_gabnresponse_t</span> to the lightweight resolver's
- canonical format.
- </p>
-<p><code class="function">lwres_gabnrequest_parse()</code>
- uses context <em class="parameter"><code>ctx</code></em> to convert the contents
- of packet <em class="parameter"><code>pkt</code></em> to a
- <span class="type">lwres_gabnrequest_t</span> structure. Buffer
- <em class="parameter"><code>b</code></em> provides space to be used for storing
- this structure. When the function succeeds, the resulting
- <span class="type">lwres_gabnrequest_t</span> is made available through
- <em class="parameter"><code>*structp</code></em>.
-
- <code class="function">lwres_gabnresponse_parse()</code> offers the same
- semantics as <code class="function">lwres_gabnrequest_parse()</code>
- except it yields a <span class="type">lwres_gabnresponse_t</span> structure.
- </p>
-<p><code class="function">lwres_gabnresponse_free()</code>
- and <code class="function">lwres_gabnrequest_free()</code> release the
- memory in resolver context <em class="parameter"><code>ctx</code></em> that was
- allocated to the <span class="type">lwres_gabnresponse_t</span> or
- <span class="type">lwres_gabnrequest_t</span> structures referenced via
- <em class="parameter"><code>structp</code></em>.
-
- Any memory associated with ancillary buffers and strings for
- those structures is also discarded.
- </p>
-</div>
-<div class="refsect1" lang="en">
-<a name="id2543667"></a><h2>RETURN VALUES</h2>
-<p>
- The getaddrbyname opcode functions
- <code class="function">lwres_gabnrequest_render()</code>,
- <code class="function">lwres_gabnresponse_render()</code>
- <code class="function">lwres_gabnrequest_parse()</code>
- and
- <code class="function">lwres_gabnresponse_parse()</code>
- all return
- <span class="errorcode">LWRES_R_SUCCESS</span>
- on success.
- They return
- <span class="errorcode">LWRES_R_NOMEMORY</span>
- if memory allocation fails.
- <span class="errorcode">LWRES_R_UNEXPECTEDEND</span>
- is returned if the available space in the buffer
- <em class="parameter"><code>b</code></em>
- is too small to accommodate the packet header or the
- <span class="type">lwres_gabnrequest_t</span>
- and
- <span class="type">lwres_gabnresponse_t</span>
- structures.
- <code class="function">lwres_gabnrequest_parse()</code>
- and
- <code class="function">lwres_gabnresponse_parse()</code>
- will return
- <span class="errorcode">LWRES_R_UNEXPECTEDEND</span>
- if the buffer is not empty after decoding the received packet.
- These functions will return
- <span class="errorcode">LWRES_R_FAILURE</span>
- if
- <em class="structfield"><code>pktflags</code></em>
- in the packet header structure
- <span class="type">lwres_lwpacket_t</span>
- indicate that the packet is not a response to an earlier query.
- </p>
-</div>
-<div class="refsect1" lang="en">
-<a name="id2543733"></a><h2>SEE ALSO</h2>
-<p><span class="citerefentry"><span class="refentrytitle">lwres_packet</span>(3)</span>
- </p>
-</div>
-</div></body>
-</html>
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