00b67f09dd
Also known as ISC bind. This import adds utilities such as host(1), dig(1), and nslookup(1), as well as many other tools and libraries. Change-Id: I035ca46e64f1965d57019e773f4ff0ef035e4aa3
193 lines
7.1 KiB
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193 lines
7.1 KiB
HTML
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>lwres_getrrsetbyname</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.71.1">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" lang="en">
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<a name="id2476275"></a><div class="titlepage"></div>
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<div class="refnamediv">
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<h2>Name</h2>
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<p>lwres_getrrsetbyname, lwres_freerrset — retrieve DNS records</p>
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</div>
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<div class="refsynopsisdiv">
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<h2>Synopsis</h2>
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<div class="funcsynopsis">
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<pre class="funcsynopsisinfo">#include <lwres/netdb.h></pre>
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<table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" style="padding-bottom: 1em">
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<tr>
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<td><code class="funcdef">
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int
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<b class="fsfunc">lwres_getrrsetbyname</b>(</code></td>
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<td>const char * </td>
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<td>
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<var class="pdparam">hostname</var>, </td>
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</tr>
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<tr>
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<td> </td>
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<td>unsigned int </td>
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<td>
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<var class="pdparam">rdclass</var>, </td>
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</tr>
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<tr>
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<td> </td>
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<td>unsigned int </td>
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<td>
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<var class="pdparam">rdtype</var>, </td>
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</tr>
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<tr>
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<td> </td>
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<td>unsigned int </td>
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<td>
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<var class="pdparam">flags</var>, </td>
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</tr>
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<tr>
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<td> </td>
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<td>struct rrsetinfo ** </td>
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<td>
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<var class="pdparam">res</var><code>)</code>;</td>
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</tr>
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</table>
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<table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr>
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<td><code class="funcdef">
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void
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<b class="fsfunc">lwres_freerrset</b>(</code></td>
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<td>struct rrsetinfo * </td>
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<td>
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<var class="pdparam">rrset</var><code>)</code>;</td>
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</tr></table>
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</div>
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<p>
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The following structures are used:
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</p>
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<pre class="programlisting">
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struct rdatainfo {
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unsigned int rdi_length; /* length of data */
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unsigned char *rdi_data; /* record data */
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};
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</pre>
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<p>
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</p>
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<pre class="programlisting">
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struct rrsetinfo {
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unsigned int rri_flags; /* RRSET_VALIDATED... */
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unsigned int rri_rdclass; /* class number */
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unsigned int rri_rdtype; /* RR type number */
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unsigned int rri_ttl; /* time to live */
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unsigned int rri_nrdatas; /* size of rdatas array */
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unsigned int rri_nsigs; /* size of sigs array */
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char *rri_name; /* canonical name */
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struct rdatainfo *rri_rdatas; /* individual records */
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struct rdatainfo *rri_sigs; /* individual signatures */
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};
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</pre>
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<p>
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</p>
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</div>
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<div class="refsect1" lang="en">
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<a name="id2543424"></a><h2>DESCRIPTION</h2>
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<p><code class="function">lwres_getrrsetbyname()</code>
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gets a set of resource records associated with a
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<em class="parameter"><code>hostname</code></em>, <em class="parameter"><code>class</code></em>,
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and <em class="parameter"><code>type</code></em>.
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<em class="parameter"><code>hostname</code></em> is a pointer a to
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null-terminated string. The <em class="parameter"><code>flags</code></em> field
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is currently unused and must be zero.
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</p>
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<p>
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After a successful call to
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<code class="function">lwres_getrrsetbyname()</code>,
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<em class="parameter"><code>*res</code></em> is a pointer to an
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<span class="type">rrsetinfo</span> structure, containing a list of one or
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more <span class="type">rdatainfo</span> structures containing resource
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records and potentially another list of <span class="type">rdatainfo</span>
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structures containing SIG resource records associated with those
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records. The members <code class="constant">rri_rdclass</code> and
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<code class="constant">rri_rdtype</code> are copied from the parameters.
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<code class="constant">rri_ttl</code> and <code class="constant">rri_name</code>
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are properties of the obtained rrset. The resource records
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contained in <code class="constant">rri_rdatas</code> and
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<code class="constant">rri_sigs</code> are in uncompressed DNS wire
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format. Properties of the rdataset are represented in the
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<code class="constant">rri_flags</code> bitfield. If the RRSET_VALIDATED
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bit is set, the data has been DNSSEC validated and the
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signatures verified.
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</p>
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<p>
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All of the information returned by
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<code class="function">lwres_getrrsetbyname()</code> is dynamically
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allocated: the <code class="constant">rrsetinfo</code> and
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<code class="constant">rdatainfo</code> structures, and the canonical
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host name strings pointed to by the
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<code class="constant">rrsetinfo</code>structure.
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Memory allocated for the dynamically allocated structures
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created by a successful call to
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<code class="function">lwres_getrrsetbyname()</code> is released by
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<code class="function">lwres_freerrset()</code>.
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<em class="parameter"><code>rrset</code></em> is a pointer to a <span class="type">struct
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rrset</span> created by a call to
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<code class="function">lwres_getrrsetbyname()</code>.
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</p>
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<p></p>
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</div>
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<div class="refsect1" lang="en">
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<a name="id2543536"></a><h2>RETURN VALUES</h2>
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<p><code class="function">lwres_getrrsetbyname()</code>
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returns zero on success, and one of the following error codes if
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an error occurred:
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</p>
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<div class="variablelist"><dl>
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<dt><span class="term"><code class="constant">ERRSET_NONAME</code></span></dt>
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<dd><p>
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the name does not exist
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</p></dd>
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<dt><span class="term"><code class="constant">ERRSET_NODATA</code></span></dt>
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<dd><p>
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the name exists, but does not have data of the desired type
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</p></dd>
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<dt><span class="term"><code class="constant">ERRSET_NOMEMORY</code></span></dt>
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<dd><p>
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memory could not be allocated
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</p></dd>
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<dt><span class="term"><code class="constant">ERRSET_INVAL</code></span></dt>
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<dd><p>
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a parameter is invalid
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</p></dd>
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<dt><span class="term"><code class="constant">ERRSET_FAIL</code></span></dt>
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<dd><p>
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other failure
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</p></dd>
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<dt><span class="term"><code class="constant"></code></span></dt>
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<dd><p></p></dd>
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</dl></div>
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<p>
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</p>
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</div>
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<div class="refsect1" lang="en">
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<a name="id2543636"></a><h2>SEE ALSO</h2>
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<p><span class="citerefentry"><span class="refentrytitle">lwres</span>(3)</span>.
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</p>
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</div>
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</div></body>
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</html>
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