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-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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--->
-<html lang="en">
-<head>
-<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
-<title>lwres_resutil</title>
-<meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
-</head>
-<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry">
-<a name="id-1"></a><div class="titlepage"></div>
-
-
-
-
-
-
-
- <div class="refnamediv">
-<h2>Name</h2>
-<p>
- lwres_string_parse,
- lwres_addr_parse,
- lwres_getaddrsbyname,
- lwres_getnamebyaddr
- &#8212; lightweight resolver utility functions
- </p>
-</div>
- <div class="refsynopsisdiv">
-<h2>Synopsis</h2>
- <div class="funcsynopsis">
-<pre class="funcsynopsisinfo">#include &lt;lwres/lwres.h&gt;</pre>
-<table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;">
-<tr>
-<td><code class="funcdef">
-lwres_result_t
-<b class="fsfunc">lwres_string_parse</b>(</code></td>
-<td>lwres_buffer_t *<var class="pdparam">b</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>char **<var class="pdparam">c</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>lwres_uint16_t *<var class="pdparam">len</var><code>)</code>;</td>
-</tr>
-</table>
-<div class="funcprototype-spacer"> </div>
-<table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;">
-<tr>
-<td><code class="funcdef">
-lwres_result_t
-<b class="fsfunc">lwres_addr_parse</b>(</code></td>
-<td>lwres_buffer_t *<var class="pdparam">b</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>lwres_addr_t *<var class="pdparam">addr</var><code>)</code>;</td>
-</tr>
-</table>
-<div class="funcprototype-spacer"> </div>
-<table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;">
-<tr>
-<td><code class="funcdef">
-lwres_result_t
-<b class="fsfunc">lwres_getaddrsbyname</b>(</code></td>
-<td>lwres_context_t *<var class="pdparam">ctx</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>const char *<var class="pdparam">name</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>lwres_uint32_t <var class="pdparam">addrtypes</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>lwres_gabnresponse_t **<var class="pdparam">structp</var><code>)</code>;</td>
-</tr>
-</table>
-<div class="funcprototype-spacer"> </div>
-<table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;">
-<tr>
-<td><code class="funcdef">
-lwres_result_t
-<b class="fsfunc">lwres_getnamebyaddr</b>(</code></td>
-<td>lwres_context_t *<var class="pdparam">ctx</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>lwres_uint32_t <var class="pdparam">addrtype</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>lwres_uint16_t <var class="pdparam">addrlen</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>const unsigned char *<var class="pdparam">addr</var>, </td>
-</tr>
-<tr>
-<td> </td>
-<td>lwres_gnbaresponse_t **<var class="pdparam">structp</var><code>)</code>;</td>
-</tr>
-</table>
-<div class="funcprototype-spacer"> </div>
-</div>
- </div>
-
- <div class="refsection">
-<a name="id-1.7"></a><h2>DESCRIPTION</h2>
-
-
- <p><code class="function">lwres_string_parse()</code>
- retrieves a DNS-encoded string starting the current pointer of
- lightweight resolver buffer <em class="parameter"><code>b</code></em>: i.e.
- <code class="constant">b-&gt;current</code>. When the function returns,
- the address of the first byte of the encoded string is returned
- via <em class="parameter"><code>*c</code></em> and the length of that string is
- given by <em class="parameter"><code>*len</code></em>. The buffer's current
- pointer is advanced to point at the character following the
- string length, the encoded string, and the trailing
- <span class="type">NULL</span> character.
- </p>
-
- <p><code class="function">lwres_addr_parse()</code>
- extracts an address from the buffer <em class="parameter"><code>b</code></em>.
- The buffer's current pointer <code class="constant">b-&gt;current</code>
- is presumed to point at an encoded address: the address preceded
- by a 32-bit protocol family identifier and a 16-bit length
- field. The encoded address is copied to
- <code class="constant">addr-&gt;address</code> and
- <code class="constant">addr-&gt;length</code> indicates the size in bytes
- of the address that was copied.
- <code class="constant">b-&gt;current</code> is advanced to point at the
- next byte of available data in the buffer following the encoded
- address.
- </p>
-
- <p><code class="function">lwres_getaddrsbyname()</code>
- and <code class="function">lwres_getnamebyaddr()</code> use the
- <span class="type">lwres_gnbaresponse_t</span> structure defined below:
- </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>
- The contents of this structure are not manipulated directly but
- they are controlled through the
- <span class="citerefentry">
- <span class="refentrytitle">lwres_gabn</span>(3)
- </span>
- functions.
- </p>
-
- <p>
- The lightweight resolver uses
- <code class="function">lwres_getaddrsbyname()</code> to perform
- forward lookups.
- Hostname <em class="parameter"><code>name</code></em> is looked up using the
- resolver
- context <em class="parameter"><code>ctx</code></em> for memory allocation.
- <em class="parameter"><code>addrtypes</code></em> is a bitmask indicating
- which type of
- addresses are to be looked up. Current values for this bitmask are
- <span class="type">LWRES_ADDRTYPE_V4</span> for IPv4 addresses and
- <span class="type">LWRES_ADDRTYPE_V6</span> for IPv6 addresses. Results of the
- lookup are returned in <em class="parameter"><code>*structp</code></em>.
- </p>
-
- <p><code class="function">lwres_getnamebyaddr()</code>
- performs reverse lookups. Resolver context
- <em class="parameter"><code>ctx</code></em> is used for memory allocation. The
- address type is indicated by <em class="parameter"><code>addrtype</code></em>:
- <span class="type">LWRES_ADDRTYPE_V4</span> or
- <span class="type">LWRES_ADDRTYPE_V6</span>. The address to be looked up is
- given by <em class="parameter"><code>addr</code></em> and its length is
- <em class="parameter"><code>addrlen</code></em> bytes. The result of the
- function call is made available through
- <em class="parameter"><code>*structp</code></em>.
- </p>
- </div>
-
- <div class="refsection">
-<a name="id-1.8"></a><h2>RETURN VALUES</h2>
-
- <p>
- Successful calls to
- <code class="function">lwres_string_parse()</code>
- and
- <code class="function">lwres_addr_parse()</code>
- return
- <span class="errorcode">LWRES_R_SUCCESS.</span>
- Both functions return
- <span class="errorcode">LWRES_R_FAILURE</span>
- if the buffer is corrupt or
- <span class="errorcode">LWRES_R_UNEXPECTEDEND</span>
- if the buffer has less space than expected for the components of the
- encoded string or address.
- </p>
-
- <p><code class="function">lwres_getaddrsbyname()</code>
- returns <span class="errorcode">LWRES_R_SUCCESS</span> on success and it
- returns <span class="errorcode">LWRES_R_NOTFOUND</span> if the hostname
- <em class="parameter"><code>name</code></em> could not be found.
- </p>
- <p><span class="errorcode">LWRES_R_SUCCESS</span>
- is returned by a successful call to
- <code class="function">lwres_getnamebyaddr()</code>.
- </p>
-
- <p>
- Both
- <code class="function">lwres_getaddrsbyname()</code>
- and
- <code class="function">lwres_getnamebyaddr()</code>
- return
- <span class="errorcode">LWRES_R_NOMEMORY</span>
- when memory allocation requests fail and
- <span class="errorcode">LWRES_R_UNEXPECTEDEND</span>
- if the buffers used for sending queries and receiving replies are too
- small.
- </p>
-
- </div>
- <div class="refsection">
-<a name="id-1.9"></a><h2>SEE ALSO</h2>
-
- <p><span class="citerefentry">
- <span class="refentrytitle">lwres_buffer</span>(3)
- </span>,
-
- <span class="citerefentry">
- <span class="refentrytitle">lwres_gabn</span>(3)
- </span>.
- </p>
-
- </div>
-</div></body>
-</html>