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diff --git a/lib/lwres/man/lwres_getipnode.html b/lib/lwres/man/lwres_getipnode.html new file mode 100644 index 0000000..49e2c14 --- /dev/null +++ b/lib/lwres/man/lwres_getipnode.html @@ -0,0 +1,316 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<!-- + - Copyright (C) 2000, 2001, 2003-2005, 2007, 2014-2016, 2018, 2019 Internet Systems Consortium, Inc. ("ISC") + - + - This Source Code Form is subject to the terms of the Mozilla Public + - License, v. 2.0. If a copy of the MPL was not distributed with this + - file, You can obtain one at http://mozilla.org/MPL/2.0/. +--> +<html lang="en"> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>lwres_getipnode</title> +<meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> +</head> +<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry"> +<a name="id-1"></a><div class="titlepage"></div> + + + + + + + + <div class="refnamediv"> +<h2>Name</h2> +<p> + lwres_getipnodebyname, + lwres_getipnodebyaddr, + lwres_freehostent + — lightweight resolver nodename / address translation API + </p> +</div> + <div class="refsynopsisdiv"> +<h2>Synopsis</h2> + <div class="funcsynopsis"> +<pre class="funcsynopsisinfo">#include <lwres/netdb.h></pre> +<table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"> +<tr> +<td><code class="funcdef"> +struct hostent * +<b class="fsfunc">lwres_getipnodebyname</b>(</code></td> +<td>const char *<var class="pdparam">name</var>, </td> +</tr> +<tr> +<td> </td> +<td>int <var class="pdparam">af</var>, </td> +</tr> +<tr> +<td> </td> +<td>int <var class="pdparam">flags</var>, </td> +</tr> +<tr> +<td> </td> +<td>int *<var class="pdparam">error_num</var><code>)</code>;</td> +</tr> +</table> +<div class="funcprototype-spacer"> </div> +<table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"> +<tr> +<td><code class="funcdef"> +struct hostent * +<b class="fsfunc">lwres_getipnodebyaddr</b>(</code></td> +<td>const void *<var class="pdparam">src</var>, </td> +</tr> +<tr> +<td> </td> +<td>size_t <var class="pdparam">len</var>, </td> +</tr> +<tr> +<td> </td> +<td>int <var class="pdparam">af</var>, </td> +</tr> +<tr> +<td> </td> +<td>int *<var class="pdparam">error_num</var><code>)</code>;</td> +</tr> +</table> +<div class="funcprototype-spacer"> </div> +<table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr> +<td><code class="funcdef"> +void +<b class="fsfunc">lwres_freehostent</b>(</code></td> +<td>struct hostent *<var class="pdparam">he</var><code>)</code>;</td> +</tr></table> +<div class="funcprototype-spacer"> </div> +</div> + </div> + + <div class="refsection"> +<a name="id-1.7"></a><h2>DESCRIPTION</h2> + + + <p> + These functions perform thread safe, protocol independent + nodename-to-address and address-to-nodename + translation as defined in RFC2553. + </p> + + <p> + They use a + <span class="type">struct hostent</span> + which is defined in + <code class="filename">namedb.h</code>: + </p> + <pre class="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 */ +</pre> +<p> + </p> + + <p> + The members of this structure are: + </p> +<div class="variablelist"><dl class="variablelist"> +<dt><span class="term"><code class="constant">h_name</code></span></dt> +<dd> + <p> + The official (canonical) name of the host. + </p> + </dd> +<dt><span class="term"><code class="constant">h_aliases</code></span></dt> +<dd> + <p> + A NULL-terminated array of alternate names (nicknames) for the + host. + </p> + </dd> +<dt><span class="term"><code class="constant">h_addrtype</code></span></dt> +<dd> + <p> + The type of address being returned - usually + <span class="type">PF_INET</span> + or + <span class="type">PF_INET6</span>. + + </p> + </dd> +<dt><span class="term"><code class="constant">h_length</code></span></dt> +<dd> + <p> + The length of the address in bytes. + </p> + </dd> +<dt><span class="term"><code class="constant">h_addr_list</code></span></dt> +<dd> + <p> + A + <span class="type">NULL</span> + terminated array of network addresses for the host. + Host addresses are returned in network byte order. + </p> + </dd> +</dl></div> +<p> + </p> + + <p><code class="function">lwres_getipnodebyname()</code> + looks up addresses of protocol family <em class="parameter"><code>af</code></em> + for the hostname <em class="parameter"><code>name</code></em>. The + <em class="parameter"><code>flags</code></em> 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: + + </p> +<div class="variablelist"><dl class="variablelist"> +<dt><span class="term"><code class="constant">AI_V4MAPPED</code></span></dt> +<dd> + <p> + This is used with an + <em class="parameter"><code>af</code></em> + of AF_INET6, and causes IPv4 addresses to be returned as + IPv4-mapped + IPv6 addresses. + </p> + </dd> +<dt><span class="term"><code class="constant">AI_ALL</code></span></dt> +<dd> + <p> + This is used with an + <em class="parameter"><code>af</code></em> + 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. + </p> + </dd> +<dt><span class="term"><code class="constant">AI_ADDRCONFIG</code></span></dt> +<dd> + <p> + 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. + </p> + </dd> +<dt><span class="term"><code class="constant">AI_DEFAULT</code></span></dt> +<dd> + <p> + This default sets the + <code class="constant">AI_V4MAPPED</code> + and + <code class="constant">AI_ADDRCONFIG</code> + flag bits. + </p> + </dd> +</dl></div> +<p> + </p> + + <p><code class="function">lwres_getipnodebyaddr()</code> + performs a reverse lookup of address <em class="parameter"><code>src</code></em> + which is <em class="parameter"><code>len</code></em> bytes long. + <em class="parameter"><code>af</code></em> denotes the protocol family, typically + <span class="type">PF_INET</span> or <span class="type">PF_INET6</span>. + </p> + <p><code class="function">lwres_freehostent()</code> + releases all the memory associated with the <span class="type">struct + hostent</span> pointer <em class="parameter"><code>he</code></em>. Any memory + allocated for the <code class="constant">h_name</code>, + <code class="constant">h_addr_list</code> and + <code class="constant">h_aliases</code> is freed, as is the memory for + the <span class="type">hostent</span> structure itself. + </p> + </div> + <div class="refsection"> +<a name="id-1.8"></a><h2>RETURN VALUES</h2> + + <p> + If an error occurs, + <code class="function">lwres_getipnodebyname()</code> + and + <code class="function">lwres_getipnodebyaddr()</code> + set + <em class="parameter"><code>*error_num</code></em> + to an appropriate error code and the function returns a + <span class="type">NULL</span> + pointer. + The error codes and their meanings are defined in + <code class="filename"><lwres/netdb.h></code>: + </p> +<div class="variablelist"><dl class="variablelist"> +<dt><span class="term"><code class="constant">HOST_NOT_FOUND</code></span></dt> +<dd> + <p> + No such host is known. + </p> + </dd> +<dt><span class="term"><code class="constant">NO_ADDRESS</code></span></dt> +<dd> + <p> + 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. + </p> + </dd> +<dt><span class="term"><code class="constant">TRY_AGAIN</code></span></dt> +<dd> + <p> + A temporary and possibly transient error occurred, such as a + failure of a server to respond. The request may succeed if + retried. + </p> + </dd> +<dt><span class="term"><code class="constant">NO_RECOVERY</code></span></dt> +<dd> + <p> + An unexpected failure occurred, and retrying the request + is pointless. + </p> + </dd> +</dl></div> +<p> + </p> + <p><span class="citerefentry"> + <span class="refentrytitle">lwres_hstrerror</span>(3) + </span> + translates these error codes to suitable error messages. + </p> + </div> + <div class="refsection"> +<a name="id-1.9"></a><h2>SEE ALSO</h2> + + <p><span class="citerefentry"> + <span class="refentrytitle">RFC2553</span> + </span>, + + <span class="citerefentry"> + <span class="refentrytitle">lwres</span>(3) + </span>, + + <span class="citerefentry"> + <span class="refentrytitle">lwres_gethostent</span>(3) + </span>, + + <span class="citerefentry"> + <span class="refentrytitle">lwres_getaddrinfo</span>(3) + </span>, + + <span class="citerefentry"> + <span class="refentrytitle">lwres_getnameinfo</span>(3) + </span>, + + <span class="citerefentry"> + <span class="refentrytitle">lwres_hstrerror</span>(3) + </span>. + </p> + </div> +</div></body> +</html> |