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a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson<hr>
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson</div>
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson<div class="appendix" lang="en">
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson<div class="titlepage"><div><div><h2 class="title">
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson<a name="Bv9ARM.ch12"></a>Appendix�D.�BIND 9 DNS Library Support</h2></div></div></div>
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson<div class="toc">
785cb9cf4f6f42d4e1da4bf27aaf750a021be13dMichael Sawyer<p><b>Table of Contents</b></p>
785cb9cf4f6f42d4e1da4bf27aaf750a021be13dMichael Sawyer<dl>
785cb9cf4f6f42d4e1da4bf27aaf750a021be13dMichael Sawyer<dt><span class="sect1"><a href="Bv9ARM.ch12.html#bind9.library">BIND 9 DNS Library Support</a></span></dt>
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson<dd><dl>
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson<dt><span class="sect2"><a href="Bv9ARM.ch12.html#id2616167">Prerequisite</a></span></dt>
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson<dt><span class="sect2"><a href="Bv9ARM.ch12.html#id2616177">Compilation</a></span></dt>
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson<dt><span class="sect2"><a href="Bv9ARM.ch12.html#id2613266">Installation</a></span></dt>
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson<dt><span class="sect2"><a href="Bv9ARM.ch12.html#id2613297">Known Defects/Restrictions</a></span></dt>
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson<dt><span class="sect2"><a href="Bv9ARM.ch12.html#id2614670">The dns.conf File</a></span></dt>
34274c3cd60edd969a34004012aed0b2cc2ab441Andreas Gustafsson<dt><span class="sect2"><a href="Bv9ARM.ch12.html#id2614697">Sample Applications</a></span></dt>
34274c3cd60edd969a34004012aed0b2cc2ab441Andreas Gustafsson<dt><span class="sect2"><a href="Bv9ARM.ch12.html#id2616284">Library References</a></span></dt>
34274c3cd60edd969a34004012aed0b2cc2ab441Andreas Gustafsson</dl></dd>
34274c3cd60edd969a34004012aed0b2cc2ab441Andreas Gustafsson</dl>
34274c3cd60edd969a34004012aed0b2cc2ab441Andreas Gustafsson</div>
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson<div class="sect1" lang="en">
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson<div class="titlepage"><div><div><h2 class="title" style="clear: both">
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson<a name="bind9.library"></a>BIND 9 DNS Library Support</h2></div></div></div>
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson<p>This version of BIND 9 "exports" its internal libraries so
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson that they can be used by third-party applications more easily (we
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson call them "export" libraries in this document). In addition to
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson all major DNS-related APIs BIND 9 is currently using, the export
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson libraries provide the following features:</p>
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson<div class="itemizedlist"><ul type="disc">
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson<li><p>The newly created "DNS client" module. This is a higher
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson level API that provides an interface to name resolution,
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson single DNS transaction with a particular server, and dynamic
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson update. Regarding name resolution, it supports advanced
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson features such as DNSSEC validation and caching. This module
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson supports both synchronous and asynchronous mode.</p></li>
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson<li><p>The new "IRS" (Information Retrieval System) library.
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson It provides an interface to parse the traditional resolv.conf
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson file and more advanced, DNS-specific configuration file for
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson the rest of this package (see the description for the
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson dns.conf file below).</p></li>
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson<li><p>As part of the IRS library, newly implemented standard
a47331123450129c1ad7d5326eecb7484b3e7348Andreas Gustafsson address-name mapping functions, getaddrinfo() and
getnameinfo(), are provided. They use the DNSSEC-aware
validating resolver backend, and could use other advanced
features of the BIND 9 libraries such as caching. The
getaddrinfo() function resolves both A and AAAA RRs
concurrently (when the address family is unspecified).</p></li>
<li><p>An experimental framework to support other event
libraries than BIND 9's internal event task system.</p></li>
</ul></div>
<div class="sect2" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<a name="id2616167"></a>Prerequisite</h3></div></div></div>
<p>GNU make is required to build the export libraries (other
part of BIND 9 can still be built with other types of make). In
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="id2616177"></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="id2613266"></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="id2613297"></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="id2614670"></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="id2614697"></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="id2614706"></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="id2614796"></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="id2614850"></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="id2614982"></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="id2614997"></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="id2616220"></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="id2616284"></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>
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