b8743b3ba5
the problems related to the handling of broken DNSSEC trust chains. This fix is only relevant for those who have DNSSEC validation enabled and configure trust anchors from third parties, either manually, or through a system like DLV.
177 lines
6.3 KiB
HTML
177 lines
6.3 KiB
HTML
<!--
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<!-- $Id: lwres_getnameinfo.html,v 1.23.418.1.8.1 2010/02/25 12:16:44 tbox Exp $ -->
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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_getnameinfo</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="id2476267"></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_getnameinfo — lightweight resolver socket address structure to hostname and
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service name
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</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">
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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_getnameinfo</b>(</code></td>
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<td>const struct sockaddr * </td>
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<td>
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<var class="pdparam">sa</var>, </td>
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</tr>
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<tr>
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<td> </td>
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<td>size_t </td>
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<td>
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<var class="pdparam">salen</var>, </td>
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</tr>
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<tr>
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<td> </td>
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<td>char * </td>
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<td>
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<var class="pdparam">host</var>, </td>
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</tr>
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<tr>
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<td> </td>
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<td>size_t </td>
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<td>
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<var class="pdparam">hostlen</var>, </td>
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</tr>
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<tr>
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<td> </td>
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<td>char * </td>
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<td>
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<var class="pdparam">serv</var>, </td>
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</tr>
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<tr>
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<td> </td>
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<td>size_t </td>
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<td>
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<var class="pdparam">servlen</var>, </td>
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</tr>
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<tr>
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<td> </td>
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<td>int </td>
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<td>
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<var class="pdparam">flags</var><code>)</code>;</td>
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</tr>
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</table>
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</div>
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</div>
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<div class="refsect1" lang="en">
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<a name="id2543390"></a><h2>DESCRIPTION</h2>
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<p>
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This function is equivalent to the
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<span class="citerefentry"><span class="refentrytitle">getnameinfo</span>(3)</span> function defined in RFC2133.
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<code class="function">lwres_getnameinfo()</code> returns the
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hostname for the
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<span class="type">struct sockaddr</span> <em class="parameter"><code>sa</code></em> which
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is
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<em class="parameter"><code>salen</code></em> bytes long. The hostname is of
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length
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<em class="parameter"><code>hostlen</code></em> and is returned via
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<em class="parameter"><code>*host.</code></em> The maximum length of the
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hostname is
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1025 bytes: <code class="constant">NI_MAXHOST</code>.
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</p>
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<p> The name of the service associated with the port number in
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<em class="parameter"><code>sa</code></em> is returned in <em class="parameter"><code>*serv.</code></em>
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It is <em class="parameter"><code>servlen</code></em> bytes long. The
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maximum length
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of the service name is <code class="constant">NI_MAXSERV</code> - 32
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bytes.
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</p>
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<p>
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The <em class="parameter"><code>flags</code></em> argument sets the
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following
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bits:
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</p>
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<div class="variablelist"><dl>
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<dt><span class="term"><code class="constant">NI_NOFQDN</code></span></dt>
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<dd><p>
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A fully qualified domain name is not required for local hosts.
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The local part of the fully qualified domain name is returned
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instead.
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</p></dd>
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<dt><span class="term"><code class="constant">NI_NUMERICHOST</code></span></dt>
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<dd><p>
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Return the address in numeric form, as if calling inet_ntop(),
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instead of a host name.
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</p></dd>
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<dt><span class="term"><code class="constant">NI_NAMEREQD</code></span></dt>
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<dd><p>
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A name is required. If the hostname cannot be found in the DNS
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and
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this flag is set, a non-zero error code is returned.
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If the hostname is not found and the flag is not set, the
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address is returned in numeric form.
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</p></dd>
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<dt><span class="term"><code class="constant">NI_NUMERICSERV</code></span></dt>
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<dd><p>
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The service name is returned as a digit string representing the
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port number.
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</p></dd>
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<dt><span class="term"><code class="constant">NI_DGRAM</code></span></dt>
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<dd><p>
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Specifies that the service being looked up is a datagram
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service, and causes getservbyport() to be called with a second
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argument of "udp" instead of its default of "tcp". This is
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required
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for the few ports (512-514) that have different services for UDP
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and
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TCP.
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</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="id2543532"></a><h2>RETURN VALUES</h2>
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<p><code class="function">lwres_getnameinfo()</code>
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returns 0 on success or a non-zero error code if an error occurs.
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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="id2543544"></a><h2>SEE ALSO</h2>
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<p><span class="citerefentry"><span class="refentrytitle">RFC2133</span></span>,
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<span class="citerefentry"><span class="refentrytitle">getservbyport</span>(3)</span>,
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<span class="citerefentry"><span class="refentrytitle">lwres</span>(3)</span>,
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<span class="citerefentry"><span class="refentrytitle">lwres_getnameinfo</span>(3)</span>,
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<span class="citerefentry"><span class="refentrytitle">lwres_getnamebyaddr</span>(3)</span>.
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<span class="citerefentry"><span class="refentrytitle">lwres_net_ntop</span>(3)</span>.
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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="id2543602"></a><h2>BUGS</h2>
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<p>
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RFC2133 fails to define what the nonzero return values of
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<span class="citerefentry"><span class="refentrytitle">getnameinfo</span>(3)</span>
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are.
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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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