lwres_getnameinfo.html revision 60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein - Copyright (C) 2004, 2005 Internet Systems Consortium, Inc. ("ISC")
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein - Copyright (C) 2000, 2001 Internet Software Consortium
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson - Permission to use, copy, modify, and distribute this software for any
ddccd5811feff696ba460dabfb666ce61040f545Andreas Gustafsson - purpose with or without fee is hereby granted, provided that the above
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60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p>lwres_getnameinfo — lightweight resolver socket address structure to hostname and
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein service name
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<pre class="funcsynopsisinfo">#include <lwres/netdb.h></pre>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<b class="fsfunc">lwres_getnameinfo</b>(</code></td>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<var class="pdparam">flags</var><code>)</code>;</td>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein This function is equivalent to the
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein <span class="citerefentry"><span class="refentrytitle">getnameinfo</span>(3)</span> function defined in RFC2133.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein <code class="function">lwres_getnameinfo()</code> returns the
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein hostname for the
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein <span class="type">struct sockaddr</span> <em class="parameter"><code>sa</code></em> which
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein <em class="parameter"><code>salen</code></em> bytes long. The hostname is of
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein <em class="parameter"><code>hostlen</code></em> and is returned via
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein <em class="parameter"><code>*host.</code></em> The maximum length of the
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein 1025 bytes: <code class="constant">NI_MAXHOST</code>.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p> The name of the service associated with the port number in
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein <em class="parameter"><code>sa</code></em> is returned in <em class="parameter"><code>*serv.</code></em>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein It is <em class="parameter"><code>servlen</code></em> bytes long. The
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein maximum length
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein of the service name is <code class="constant">NI_MAXSERV</code> - 32
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein The <em class="parameter"><code>flags</code></em> argument sets the
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<dt><span class="term"><code class="constant">NI_NOFQDN</code></span></dt>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein A fully qualified domain name is not required for local hosts.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein The local part of the fully qualified domain name is returned
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<dt><span class="term"><code class="constant">NI_NUMERICHOST</code></span></dt>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein Return the address in numeric form, as if calling inet_ntop(),
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein instead of a host name.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<dt><span class="term"><code class="constant">NI_NAMEREQD</code></span></dt>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein A name is required. If the hostname cannot be found in the DNS
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein this flag is set, a non-zero error code is returned.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein If the hostname is not found and the flag is not set, the
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein address is returned in numeric form.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<dt><span class="term"><code class="constant">NI_NUMERICSERV</code></span></dt>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein The service name is returned as a digit string representing the
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein port number.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<dt><span class="term"><code class="constant">NI_DGRAM</code></span></dt>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein Specifies that the service being looked up is a datagram
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein service, and causes getservbyport() to be called with a second
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein argument of "udp" instead of its default of "tcp". This is
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein for the few ports (512-514) that have different services for UDP
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p><code class="function">lwres_getnameinfo()</code>
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein returns 0 on success or a non-zero error code if an error occurs.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein<p><span class="citerefentry"><span class="refentrytitle">RFC2133</span></span>,
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein <span class="citerefentry"><span class="refentrytitle">getservbyport</span>(3)</span>,
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein <span class="citerefentry"><span class="refentrytitle">lwres</span>(3)</span>,
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein <span class="citerefentry"><span class="refentrytitle">lwres_getnameinfo</span>(3)</span>,
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein <span class="citerefentry"><span class="refentrytitle">lwres_getnamebyaddr</span>(3)</span>.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein <span class="citerefentry"><span class="refentrytitle">lwres_net_ntop</span>(3)</span>.
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein RFC2133 fails to define what the nonzero return values of
60e5e10f8d2e2b0c41e8abad38cacd867caa6ab2Rob Austein <span class="citerefentry"><span class="refentrytitle">getnameinfo</span>(3)</span>