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-<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
- "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
- [<!ENTITY mdash "&#8212;">]>
-<!--
- - Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
- - Copyright (C) 2000, 2001, 2003 Internet Software Consortium.
- -
- - Permission to use, copy, modify, and/or distribute this software for any
- - purpose with or without fee is hereby granted, provided that the above
- - copyright notice and this permission notice appear in all copies.
- -
- - THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
- - REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
- - AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
- - INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
- - LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
- - OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
- - PERFORMANCE OF THIS SOFTWARE.
--->
-
-<!-- $Id: lwres_getipnode.docbook,v 1.12 2007/06/18 23:47:51 tbox Exp $ -->
-<refentry>
-
- <refentryinfo>
- <date>Jun 30, 2000</date>
- </refentryinfo>
-
- <refmeta>
- <refentrytitle>lwres_getipnode</refentrytitle>
- <manvolnum>3</manvolnum>
- <refmiscinfo>BIND9</refmiscinfo>
- </refmeta>
-
- <docinfo>
- <copyright>
- <year>2004</year>
- <year>2005</year>
- <year>2007</year>
- <holder>Internet Systems Consortium, Inc. ("ISC")</holder>
- </copyright>
- <copyright>
- <year>2000</year>
- <year>2001</year>
- <year>2003</year>
- <holder>Internet Software Consortium.</holder>
- </copyright>
- </docinfo>
-
- <refnamediv>
- <refname>lwres_getipnodebyname</refname>
- <refname>lwres_getipnodebyaddr</refname>
- <refname>lwres_freehostent</refname>
- <refpurpose>lightweight resolver nodename / address translation API</refpurpose>
- </refnamediv>
- <refsynopsisdiv>
- <funcsynopsis>
-<funcsynopsisinfo>#include &lt;lwres/netdb.h&gt;</funcsynopsisinfo>
-<funcprototype>
- <funcdef>
-struct hostent *
-<function>lwres_getipnodebyname</function></funcdef>
- <paramdef>const char *<parameter>name</parameter></paramdef>
- <paramdef>int <parameter>af</parameter></paramdef>
- <paramdef>int <parameter>flags</parameter></paramdef>
- <paramdef>int *<parameter>error_num</parameter></paramdef>
- </funcprototype>
-<funcprototype>
- <funcdef>
-struct hostent *
-<function>lwres_getipnodebyaddr</function></funcdef>
- <paramdef>const void *<parameter>src</parameter></paramdef>
- <paramdef>size_t <parameter>len</parameter></paramdef>
- <paramdef>int <parameter>af</parameter></paramdef>
- <paramdef>int *<parameter>error_num</parameter></paramdef>
- </funcprototype>
-<funcprototype>
- <funcdef>
-void
-<function>lwres_freehostent</function></funcdef>
- <paramdef>struct hostent *<parameter>he</parameter></paramdef>
- </funcprototype>
-</funcsynopsis>
- </refsynopsisdiv>
-
- <refsect1>
- <title>DESCRIPTION</title>
-
- <para>
- These functions perform thread safe, protocol independent
- nodename-to-address and address-to-nodename
- translation as defined in RFC2553.
- </para>
-
- <para>
- They use a
- <type>struct hostent</type>
- which is defined in
- <filename>namedb.h</filename>:
- </para>
- <para><programlisting>
-struct hostent {
- char *h_name; /* official name of host */
- char **h_aliases; /* alias list */
- int h_addrtype; /* host address type */
- int h_length; /* length of address */
- char **h_addr_list; /* list of addresses from name server */
-};
-#define h_addr h_addr_list[0] /* address, for backward compatibility */
-</programlisting>
- </para>
-
- <para>
- The members of this structure are:
- <variablelist>
- <varlistentry>
- <term><constant>h_name</constant></term>
- <listitem>
- <para>
- The official (canonical) name of the host.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><constant>h_aliases</constant></term>
- <listitem>
- <para>
- A NULL-terminated array of alternate names (nicknames) for the
- host.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><constant>h_addrtype</constant></term>
- <listitem>
- <para>
- The type of address being returned - usually
- <type>PF_INET</type>
- or
- <type>PF_INET6</type>.
-
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><constant>h_length</constant></term>
- <listitem>
- <para>
- The length of the address in bytes.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><constant>h_addr_list</constant></term>
- <listitem>
- <para>
- A
- <type>NULL</type>
- terminated array of network addresses for the host.
- Host addresses are returned in network byte order.
- </para>
- </listitem>
- </varlistentry>
- </variablelist>
- </para>
-
- <para><function>lwres_getipnodebyname()</function>
- looks up addresses of protocol family <parameter>af</parameter>
- for the hostname <parameter>name</parameter>. The
- <parameter>flags</parameter> parameter contains ORed flag bits
- to specify the types of addresses that are searched for, and the
- types of addresses that are returned. The flag bits are:
-
- <variablelist>
- <varlistentry>
- <term><constant>AI_V4MAPPED</constant></term>
- <listitem>
- <para>
- This is used with an
- <parameter>af</parameter>
- of AF_INET6, and causes IPv4 addresses to be returned as
- IPv4-mapped
- IPv6 addresses.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><constant>AI_ALL</constant></term>
- <listitem>
- <para>
- This is used with an
- <parameter>af</parameter>
- of AF_INET6, and causes all known addresses (IPv6 and IPv4) to
- be returned.
- If AI_V4MAPPED is also set, the IPv4 addresses are return as
- mapped
- IPv6 addresses.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><constant>AI_ADDRCONFIG</constant></term>
- <listitem>
- <para>
- Only return an IPv6 or IPv4 address if here is an active network
- interface of that type. This is not currently implemented
- in the BIND 9 lightweight resolver, and the flag is ignored.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><constant>AI_DEFAULT</constant></term>
- <listitem>
- <para>
- This default sets the
- <constant>AI_V4MAPPED</constant>
- and
- <constant>AI_ADDRCONFIG</constant>
- flag bits.
- </para>
- </listitem>
- </varlistentry>
- </variablelist>
- </para>
-
- <para><function>lwres_getipnodebyaddr()</function>
- performs a reverse lookup of address <parameter>src</parameter>
- which is <parameter>len</parameter> bytes long.
- <parameter>af</parameter> denotes the protocol family, typically
- <type>PF_INET</type> or <type>PF_INET6</type>.
- </para>
- <para><function>lwres_freehostent()</function>
- releases all the memory associated with the <type>struct
- hostent</type> pointer <parameter>he</parameter>. Any memory
- allocated for the <constant>h_name</constant>,
- <constant>h_addr_list</constant> and
- <constant>h_aliases</constant> is freed, as is the memory for
- the <type>hostent</type> structure itself.
- </para>
- </refsect1>
- <refsect1>
- <title>RETURN VALUES</title>
- <para>
- If an error occurs,
- <function>lwres_getipnodebyname()</function>
- and
- <function>lwres_getipnodebyaddr()</function>
- set
- <parameter>*error_num</parameter>
- to an appropriate error code and the function returns a
- <type>NULL</type>
- pointer.
- The error codes and their meanings are defined in
- <filename>&lt;lwres/netdb.h&gt;</filename>:
- <variablelist>
- <varlistentry>
- <term><constant>HOST_NOT_FOUND</constant></term>
- <listitem>
- <para>
- No such host is known.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><constant>NO_ADDRESS</constant></term>
- <listitem>
- <para>
- The server recognised the request and the name but no address is
- available. Another type of request to the name server for the
- domain might return an answer.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><constant>TRY_AGAIN</constant></term>
- <listitem>
- <para>
- A temporary and possibly transient error occurred, such as a
- failure of a server to respond. The request may succeed if
- retried.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><constant>NO_RECOVERY</constant></term>
- <listitem>
- <para>
- An unexpected failure occurred, and retrying the request
- is pointless.
- </para>
- </listitem>
- </varlistentry>
- </variablelist>
- </para>
- <para><citerefentry>
- <refentrytitle>lwres_hstrerror</refentrytitle><manvolnum>3</manvolnum>
- </citerefentry>
- translates these error codes to suitable error messages.
- </para>
- </refsect1>
- <refsect1>
- <title>SEE ALSO</title>
- <para><citerefentry>
- <refentrytitle>RFC2553</refentrytitle>
- </citerefentry>,
-
- <citerefentry>
- <refentrytitle>lwres</refentrytitle><manvolnum>3</manvolnum>
- </citerefentry>,
-
- <citerefentry>
- <refentrytitle>lwres_gethostent</refentrytitle><manvolnum>3</manvolnum>
- </citerefentry>,
-
- <citerefentry>
- <refentrytitle>lwres_getaddrinfo</refentrytitle><manvolnum>3</manvolnum>
- </citerefentry>,
-
- <citerefentry>
- <refentrytitle>lwres_getnameinfo</refentrytitle><manvolnum>3</manvolnum>
- </citerefentry>,
-
- <citerefentry>
- <refentrytitle>lwres_hstrerror</refentrytitle><manvolnum>3</manvolnum>
- </citerefentry>.
- </para>
- </refsect1>
-</refentry><!--
- - Local variables:
- - mode: sgml
- - End:
--->
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