Bv9ARM.ch12.html revision d9184858dd5d7677050a813d444c281c56f697aa
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<!--
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster - Copyright (C) 2004-2015 Internet Systems Consortium, Inc. ("ISC")
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster - Copyright (C) 2000-2003 Internet Software Consortium.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster -
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster - Permission to use, copy, modify, and/or distribute this software for any
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster - purpose with or without fee is hereby granted, provided that the above
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster - copyright notice and this permission notice appear in all copies.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster -
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster - THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster - REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster - AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster - INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster - LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster - OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster - PERFORMANCE OF THIS SOFTWARE.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster-->
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<!-- $Id$ -->
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<html>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<head>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<title>Appendix�D.�BIND 9 DNS Library Support</title>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<meta name="generator" content="DocBook XSL Stylesheets V1.71.1">
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<link rel="start" href="Bv9ARM.html" title="BIND 9 Administrator Reference Manual">
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<link rel="up" href="Bv9ARM.html" title="BIND 9 Administrator Reference Manual">
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<link rel="prev" href="Bv9ARM.ch11.html" title="Appendix�C.�General DNS Reference Information">
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<link rel="next" href="Bv9ARM.ch13.html" title="Manual pages">
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster</head>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<div class="navheader">
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<table width="100%" summary="Navigation header">
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<tr><th colspan="3" align="center">Appendix�D.�BIND 9 DNS Library Support</th></tr>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<tr>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<td width="20%" align="left">
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<a accesskey="p" href="Bv9ARM.ch11.html">Prev</a>�</td>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<th width="60%" align="center">�</th>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<td width="20%" align="right">�<a accesskey="n" href="Bv9ARM.ch13.html">Next</a>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster</td>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster</tr>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster</table>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<hr>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster</div>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<div class="appendix" lang="en">
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<div class="titlepage"><div><div><h2 class="title">
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<a name="Bv9ARM.ch12"></a>Appendix�D.�BIND 9 DNS Library Support</h2></div></div></div>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<div class="toc">
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<p><b>Table of Contents</b></p>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<dl>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<dt><span class="sect1"><a href="Bv9ARM.ch12.html#bind9.library">BIND 9 DNS Library Support</a></span></dt>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<dd><dl>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<dt><span class="sect2"><a href="Bv9ARM.ch12.html#id2614528">Prerequisite</a></span></dt>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<dt><span class="sect2"><a href="Bv9ARM.ch12.html#id2614537">Compilation</a></span></dt>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<dt><span class="sect2"><a href="Bv9ARM.ch12.html#id2613401">Installation</a></span></dt>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<dt><span class="sect2"><a href="Bv9ARM.ch12.html#id2613432">Known Defects/Restrictions</a></span></dt>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<dt><span class="sect2"><a href="Bv9ARM.ch12.html#id2613645">The dns.conf File</a></span></dt>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<dt><span class="sect2"><a href="Bv9ARM.ch12.html#id2613740">Sample Applications</a></span></dt>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<dt><span class="sect2"><a href="Bv9ARM.ch12.html#id2614986">Library References</a></span></dt>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster</dl></dd>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster</dl>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster</div>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<div class="sect1" lang="en">
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<div class="titlepage"><div><div><h2 class="title" style="clear: both">
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<a name="bind9.library"></a>BIND 9 DNS Library Support</h2></div></div></div>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<p>This version of BIND 9 "exports" its internal libraries so
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster that they can be used by third-party applications more easily (we
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster call them "export" libraries in this document). In addition to
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster all major DNS-related APIs BIND 9 is currently using, the export
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster libraries provide the following features:</p>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<div class="itemizedlist"><ul type="disc">
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<li><p>The newly created "DNS client" module. This is a higher
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster level API that provides an interface to name resolution,
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster single DNS transaction with a particular server, and dynamic
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster update. Regarding name resolution, it supports advanced
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster features such as DNSSEC validation and caching. This module
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster supports both synchronous and asynchronous mode.</p></li>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<li><p>The new "IRS" (Information Retrieval System) library.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster It provides an interface to parse the traditional resolv.conf
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster file and more advanced, DNS-specific configuration file for
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster the rest of this package (see the description for the
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster dns.conf file below).</p></li>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<li><p>As part of the IRS library, newly implemented standard
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster address-name mapping functions, getaddrinfo() and
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster getnameinfo(), are provided. They use the DNSSEC-aware
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster validating resolver backend, and could use other advanced
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster features of the BIND 9 libraries such as caching. The
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster getaddrinfo() function resolves both A and AAAA RRs
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster concurrently (when the address family is unspecified).</p></li>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<li><p>An experimental framework to support other event
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster libraries than BIND 9's internal event task system.</p></li>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster</ul></div>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<div class="sect2" lang="en">
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<div class="titlepage"><div><div><h3 class="title">
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<a name="id2614528"></a>Prerequisite</h3></div></div></div>
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster<p>GNU make is required to build the export libraries (other
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster part of BIND 9 can still be built with other types of make). In
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster the reminder of this document, "make" means GNU make. Note that
in some platforms you may need to invoke a different command name
than "make" (e.g. "gmake") to indicate it's GNU make.</p>
</div>
<div class="sect2" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="id2614537"></a>Compilation</h3></div></div></div>
<pre class="screen">
$ <strong class="userinput"><code>/configure --enable-exportlib <em class="replaceable"><code>[other flags]</code></em></code></strong>
$ <strong class="userinput"><code>make</code></strong>
</pre>
<p>
This will create (in addition to usual BIND 9 programs) and a
separate set of libraries under the lib/export directory. For
example, <code class="filename">lib/export/dns/libdns.a</code> is the archive file of the
export version of the BIND 9 DNS library. Sample application
programs using the libraries will also be built under the
lib/export/samples directory (see below).</p>
</div>
<div class="sect2" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="id2613401"></a>Installation</h3></div></div></div>
<pre class="screen">
$ <strong class="userinput"><code>cd lib/export</code></strong>
$ <strong class="userinput"><code>make install</code></strong>
</pre>
<p>
This will install library object files under the directory
specified by the --with-export-libdir configure option (default:
EPREFIX/lib/bind9), and header files under the directory
specified by the --with-export-includedir configure option
(default: PREFIX/include/bind9).
Root privilege is normally required.
"<span><strong class="command">make install</strong></span>" at the top directory will do the
same.
</p>
<p>
To see how to build your own
application after the installation, see
<code class="filename">lib/export/samples/Makefile-postinstall.in</code>.</p>
</div>
<div class="sect2" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="id2613432"></a>Known Defects/Restrictions</h3></div></div></div>
<div class="itemizedlist"><ul type="disc">
<li><p>Currently, win32 is not supported for the export
library. (Normal BIND 9 application can be built as
before).</p></li>
<li>
<p>The "fixed" RRset order is not (currently) supported in
the export library. If you want to use "fixed" RRset order
for, e.g. <span><strong class="command">named</strong></span> while still building the
export library even without the fixed order support, build
them separately:
</p>
<pre class="screen">
$ <strong class="userinput"><code>/configure --enable-fixed-rrset <em class="replaceable"><code>[other flags, but not --enable-exportlib]</code></em></code></strong>
$ <strong class="userinput"><code>make</code></strong>
$ <strong class="userinput"><code>/configure --enable-exportlib <em class="replaceable"><code>[other flags, but not --enable-fixed-rrset]</code></em></code></strong>
$ <strong class="userinput"><code>cd lib/export</code></strong>
$ <strong class="userinput"><code>make</code></strong>
</pre>
<p>
</p>
</li>
<li><p>The client module and the IRS library currently do not
support DNSSEC validation using DLV (the underlying modules
can handle it, but there is no tunable interface to enable
the feature).</p></li>
<li><p>RFC 5011 is not supported in the validating stub
resolver of the export library. In fact, it is not clear
whether it should: trust anchors would be a system-wide
configuration which would be managed by an administrator,
while the stub resolver will be used by ordinary applications
run by a normal user.</p></li>
<li><p>Not all common <code class="filename">/etc/resolv.conf</code>
options are supported
in the IRS library. The only available options in this
version are "debug" and "ndots".</p></li>
</ul></div>
</div>
<div class="sect2" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="id2613645"></a>The dns.conf File</h3></div></div></div>
<p>The IRS library supports an "advanced" configuration file
related to the DNS library for configuration parameters that
would be beyond the capability of the
<code class="filename">resolv.conf</code> file.
Specifically, it is intended to provide DNSSEC related
configuration parameters. By default the path to this
configuration file is <code class="filename">/etc/dns.conf</code>.
This module is very
experimental and the configuration syntax or library interfaces
may change in future versions. Currently, only the
<span><strong class="command">trusted-keys</strong></span>
statement is supported, whose syntax is the same as the same name
of statement for <code class="filename">named.conf</code>. (See
<a href="Bv9ARM.ch06.html#trusted-keys" title="trusted-keys Statement Grammar">the section called &#8220;<span><strong class="command">trusted-keys</strong></span> Statement Grammar&#8221;</a> for details.)</p>
</div>
<div class="sect2" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="id2613740"></a>Sample Applications</h3></div></div></div>
<p>Some sample application programs using this API are
provided for reference. The following is a brief description of
these applications.
</p>
<div class="sect3" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="id2613749"></a>sample: a simple stub resolver utility</h4></div></div></div>
<p>
It sends a query of a given name (of a given optional RR type) to a
specified recursive server, and prints the result as a list of
RRs. It can also act as a validating stub resolver if a trust
anchor is given via a set of command line options.</p>
<p>
Usage: sample [options] server_address hostname
</p>
<p>
Options and Arguments:
</p>
<div class="variablelist"><dl>
<dt><span class="term">
-t RRtype
</span></dt>
<dd><p>
specify the RR type of the query. The default is the A RR.
</p></dd>
<dt><span class="term">
[-a algorithm] [-e] -k keyname -K keystring
</span></dt>
<dd>
<p>
specify a command-line DNS key to validate the answer. For
example, to specify the following DNSKEY of example.com:
</p>
<div class="literallayout"><p><br>
����������������example.com.�3600�IN�DNSKEY�257�3�5�xxx<br>
</p></div>
<p>
specify the options as follows:
</p>
<pre class="screen">
<strong class="userinput"><code>
-e -k example.com -K "xxx"
</code></strong>
</pre>
<p>
-e means that this key is a zone's "key signing key" (as known
as "secure Entry point").
When -a is omitted rsasha1 will be used by default.
</p>
</dd>
<dt><span class="term">
-s domain:alt_server_address
</span></dt>
<dd><p>
specify a separate recursive server address for the specific
"domain". Example: -s example.com:2001:db8::1234
</p></dd>
<dt><span class="term">server_address</span></dt>
<dd><p>
an IP(v4/v6) address of the recursive server to which queries
are sent.
</p></dd>
<dt><span class="term">hostname</span></dt>
<dd><p>
the domain name for the query
</p></dd>
</dl></div>
</div>
<div class="sect3" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="id2613840"></a>sample-async: a simple stub resolver, working asynchronously</h4></div></div></div>
<p>
Similar to "sample", but accepts a list
of (query) domain names as a separate file and resolves the names
asynchronously.</p>
<p>
Usage: sample-async [-s server_address] [-t RR_type] input_file</p>
<p>
Options and Arguments:
</p>
<div class="variablelist"><dl>
<dt><span class="term">
-s server_address
</span></dt>
<dd>
an IPv4 address of the recursive server to which queries are sent.
(IPv6 addresses are not supported in this implementation)
</dd>
<dt><span class="term">
-t RR_type
</span></dt>
<dd>
specify the RR type of the queries. The default is the A
RR.
</dd>
<dt><span class="term">
input_file
</span></dt>
<dd>
a list of domain names to be resolved. each line
consists of a single domain name. Example:
<div class="literallayout"><p><br>
��www.example.com<br>
��mx.example.net<br>
��ns.xxx.example<br>
</p></div>
</dd>
</dl></div>
</div>
<div class="sect3" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="id2614234"></a>sample-request: a simple DNS transaction client</h4></div></div></div>
<p>
It sends a query to a specified server, and
prints the response with minimal processing. It doesn't act as a
"stub resolver": it stops the processing once it gets any
response from the server, whether it's a referral or an alias
(CNAME or DNAME) that would require further queries to get the
ultimate answer. In other words, this utility acts as a very
simplified <span><strong class="command">dig</strong></span>.
</p>
<p>
Usage: sample-request [-t RRtype] server_address hostname
</p>
<p>
Options and Arguments:
</p>
<div class="variablelist"><dl>
<dt><span class="term">
-t RRtype
</span></dt>
<dd><p>
specify the RR type of
the queries. The default is the A RR.
</p></dd>
<dt><span class="term">
server_address
</span></dt>
<dd><p>
an IP(v4/v6)
address of the recursive server to which the query is sent.
</p></dd>
<dt><span class="term">
hostname
</span></dt>
<dd><p>
the domain name for the query
</p></dd>
</dl></div>
</div>
<div class="sect3" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="id2614298"></a>sample-gai: getaddrinfo() and getnameinfo() test code</h4></div></div></div>
<p>
This is a test program
to check getaddrinfo() and getnameinfo() behavior. It takes a
host name as an argument, calls getaddrinfo() with the given host
name, and calls getnameinfo() with the resulting IP addresses
returned by getaddrinfo(). If the dns.conf file exists and
defines a trust anchor, the underlying resolver will act as a
validating resolver, and getaddrinfo()/getnameinfo() will fail
with an EAI_INSECUREDATA error when DNSSEC validation fails.
</p>
<p>
Usage: sample-gai hostname
</p>
</div>
<div class="sect3" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="id2614313"></a>sample-update: a simple dynamic update client program</h4></div></div></div>
<p>
It accepts a single update command as a
command-line argument, sends an update request message to the
authoritative server, and shows the response from the server. In
other words, this is a simplified <span><strong class="command">nsupdate</strong></span>.
</p>
<p>
Usage: sample-update [options] (add|delete) "update data"
</p>
<p>
Options and Arguments:
</p>
<div class="variablelist"><dl>
<dt><span class="term">
-a auth_server
</span></dt>
<dd><p>
An IP address of the authoritative server that has authority
for the zone containing the update name. This should normally
be the primary authoritative server that accepts dynamic
updates. It can also be a secondary server that is configured
to forward update requests to the primary server.
</p></dd>
<dt><span class="term">
-k keyfile
</span></dt>
<dd><p>
A TSIG key file to secure the update transaction. The keyfile
format is the same as that for the nsupdate utility.
</p></dd>
<dt><span class="term">
-p prerequisite
</span></dt>
<dd><p>
A prerequisite for the update (only one prerequisite can be
specified). The prerequisite format is the same as that is
accepted by the nsupdate utility.
</p></dd>
<dt><span class="term">
-r recursive_server
</span></dt>
<dd><p>
An IP address of a recursive server that this utility will
use. A recursive server may be necessary to identify the
authoritative server address to which the update request is
sent.
</p></dd>
<dt><span class="term">
-z zonename
</span></dt>
<dd><p>
The domain name of the zone that contains
</p></dd>
<dt><span class="term">
(add|delete)
</span></dt>
<dd><p>
Specify the type of update operation. Either "add" or "delete"
must be specified.
</p></dd>
<dt><span class="term">
"update data"
</span></dt>
<dd><p>
Specify the data to be updated. A typical example of the data
would look like "name TTL RRtype RDATA".
</p></dd>
</dl></div>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>In practice, either -a or -r must be specified. Others can
be optional; the underlying library routine tries to identify the
appropriate server and the zone name for the update.</div>
<p>
Examples: assuming the primary authoritative server of the
dynamic.example.com zone has an IPv6 address 2001:db8::1234,
</p>
<pre class="screen">
$ <strong class="userinput"><code>sample-update -a sample-update -k Kxxx.+nnn+mmmm.key add "foo.dynamic.example.com 30 IN A 192.168.2.1"</code></strong></pre>
<p>
adds an A RR for foo.dynamic.example.com using the given key.
</p>
<pre class="screen">
$ <strong class="userinput"><code>sample-update -a sample-update -k Kxxx.+nnn+mmmm.key delete "foo.dynamic.example.com 30 IN A"</code></strong></pre>
<p>
removes all A RRs for foo.dynamic.example.com using the given key.
</p>
<pre class="screen">
$ <strong class="userinput"><code>sample-update -a sample-update -k Kxxx.+nnn+mmmm.key delete "foo.dynamic.example.com"</code></strong></pre>
<p>
removes all RRs for foo.dynamic.example.com using the given key.
</p>
</div>
<div class="sect3" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="id2614854"></a>nsprobe: domain/name server checker in terms of RFC 4074</h4></div></div></div>
<p>
It checks a set
of domains to see the name servers of the domains behave
correctly in terms of RFC 4074. This is included in the set of
sample programs to show how the export library can be used in a
DNS-related application.
</p>
<p>
Usage: nsprobe [-d] [-v [-v...]] [-c cache_address] [input_file]
</p>
<p>
Options
</p>
<div class="variablelist"><dl>
<dt><span class="term">
-d
</span></dt>
<dd><p>
run in the "debug" mode. with this option nsprobe will dump
every RRs it receives.
</p></dd>
<dt><span class="term">
-v
</span></dt>
<dd><p>
increase verbosity of other normal log messages. This can be
specified multiple times
</p></dd>
<dt><span class="term">
-c cache_address
</span></dt>
<dd><p>
specify an IP address of a recursive (caching) name server.
nsprobe uses this server to get the NS RRset of each domain and
the A and/or AAAA RRsets for the name servers. The default
value is 127.0.0.1.
</p></dd>
<dt><span class="term">
input_file
</span></dt>
<dd><p>
a file name containing a list of domain (zone) names to be
probed. when omitted the standard input will be used. Each
line of the input file specifies a single domain name such as
"example.com". In general this domain name must be the apex
name of some DNS zone (unlike normal "host names" such as
"www.example.com"). nsprobe first identifies the NS RRsets for
the given domain name, and sends A and AAAA queries to these
servers for some "widely used" names under the zone;
specifically, adding "www" and "ftp" to the zone name.
</p></dd>
</dl></div>
</div>
</div>
<div class="sect2" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="id2614986"></a>Library References</h3></div></div></div>
<p>As of this writing, there is no formal "manual" of the
libraries, except this document, header files (some of them
provide pretty detailed explanations), and sample application
programs.</p>
</div>
</div>
</div>
<div class="navfooter">
<hr>
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left">
<a accesskey="p" href="Bv9ARM.ch11.html">Prev</a>�</td>
<td width="20%" align="center">�</td>
<td width="40%" align="right">�<a accesskey="n" href="Bv9ARM.ch13.html">Next</a>
</td>
</tr>
<tr>
<td width="40%" align="left" valign="top">Appendix�C.�General <acronym class="acronym">DNS</acronym> Reference Information�</td>
<td width="20%" align="center"><a accesskey="h" href="Bv9ARM.html">Home</a></td>
<td width="40%" align="right" valign="top">�Manual pages</td>
</tr>
</table>
</div>
<p style="text-align: center;">BIND 9.11.0pre-alpha</p>
</body>
</html>