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
206 lines
6.8 KiB
Plaintext
206 lines
6.8 KiB
Plaintext
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
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[<!ENTITY mdash "—">]>
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<!--
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- Copyright (C) 2004, 2005, 2007, 2014 Internet Systems Consortium, Inc. ("ISC")
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- Copyright (C) 2000, 2001 Internet Software Consortium.
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-
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- Permission to use, copy, modify, and/or distribute this software for any
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- purpose with or without fee is hereby granted, provided that the above
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- copyright notice and this permission notice appear in all copies.
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-
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- THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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- REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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- AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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- INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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- LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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- OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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- PERFORMANCE OF THIS SOFTWARE.
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-->
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<refentry>
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<refentryinfo>
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<date>June 18, 2007</date>
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</refentryinfo>
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<refmeta>
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<refentrytitle>lwres_getnameinfo</refentrytitle>
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<manvolnum>3</manvolnum>
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<refmiscinfo>BIND9</refmiscinfo>
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</refmeta>
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<docinfo>
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<copyright>
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<year>2004</year>
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<year>2005</year>
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<year>2007</year>
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<year>2014</year>
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<holder>Internet Systems Consortium, Inc. ("ISC")</holder>
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</copyright>
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<copyright>
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<year>2000</year>
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<year>2001</year>
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<holder>Internet Software Consortium.</holder>
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</copyright>
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</docinfo>
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<refnamediv>
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<refname>lwres_getnameinfo</refname>
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<refpurpose>lightweight resolver socket address structure to hostname and
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service name
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</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <lwres/netdb.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>
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int
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<function>lwres_getnameinfo</function></funcdef>
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<paramdef>const struct sockaddr *<parameter>sa</parameter></paramdef>
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<paramdef>size_t <parameter>salen</parameter></paramdef>
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<paramdef>char *<parameter>host</parameter></paramdef>
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<paramdef>size_t <parameter>hostlen</parameter></paramdef>
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<paramdef>char *<parameter>serv</parameter></paramdef>
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<paramdef>size_t <parameter>servlen</parameter></paramdef>
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<paramdef>int <parameter>flags</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>DESCRIPTION</title>
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<para>
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This function is equivalent to the
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<citerefentry>
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<refentrytitle>getnameinfo</refentrytitle><manvolnum>3</manvolnum>
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</citerefentry> function defined in RFC2133.
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<function>lwres_getnameinfo()</function> returns the
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hostname for the
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<type>struct sockaddr</type> <parameter>sa</parameter> which
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is
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<parameter>salen</parameter> bytes long. The hostname is of
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length
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<parameter>hostlen</parameter> and is returned via
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<parameter>*host.</parameter> The maximum length of the
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hostname is
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1025 bytes: <constant>NI_MAXHOST</constant>.
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</para>
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<para> The name of the service associated with the port number in
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<parameter>sa</parameter> is returned in <parameter>*serv.</parameter>
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It is <parameter>servlen</parameter> bytes long. The
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maximum length
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of the service name is <constant>NI_MAXSERV</constant> - 32
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bytes.
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</para>
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<para>
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The <parameter>flags</parameter> argument sets the
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following
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bits:
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<variablelist>
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<varlistentry>
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<term><constant>NI_NOFQDN</constant></term>
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<listitem>
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<para>
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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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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>NI_NUMERICHOST</constant></term>
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<listitem>
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<para>
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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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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>NI_NAMEREQD</constant></term>
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<listitem>
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<para>
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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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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>NI_NUMERICSERV</constant></term>
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<listitem>
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<para>
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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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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>NI_DGRAM</constant></term>
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<listitem>
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<para>
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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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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1>
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<title>RETURN VALUES</title>
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<para><function>lwres_getnameinfo()</function>
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returns 0 on success or a non-zero error code if an error occurs.
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</para>
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</refsect1>
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<refsect1>
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<title>SEE ALSO</title>
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<para><citerefentry>
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<refentrytitle>RFC2133</refentrytitle>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>getservbyport</refentrytitle><manvolnum>3</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>lwres</refentrytitle><manvolnum>3</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>lwres_getnameinfo</refentrytitle><manvolnum>3</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>lwres_getnamebyaddr</refentrytitle><manvolnum>3</manvolnum>
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</citerefentry>.
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<citerefentry>
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<refentrytitle>lwres_net_ntop</refentrytitle><manvolnum>3</manvolnum>
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</citerefentry>.
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</para>
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</refsect1>
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<refsect1>
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<title>BUGS</title>
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<para>
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RFC2133 fails to define what the nonzero return values of
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<citerefentry>
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<refentrytitle>getnameinfo</refentrytitle><manvolnum>3</manvolnum>
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</citerefentry>
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are.
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</para>
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</refsect1>
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</refentry><!--
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- Local variables:
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- mode: sgml
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- End:
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-->
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