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PTR RRs benefit from label compression, whereas TXT records do not.
Therefore I prefer PTR records for any such "metadata" references
within DNS. There's no chance they'll be mistaken for, or conflict
with reverse DNS records if they're not in the in-addr.arpa branch
of the namespace.<br>
<br>
- Kevin<br>
<br>
On 11/9/2010 4:16 PM, <a class="moz-txt-link-abbreviated" href="mailto:Philippe.Simonet@swisscom.com">Philippe.Simonet@swisscom.com</a> wrote:
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<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US">Hi<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US">If you have control over all zones,
you could also pre-store the results of <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US">your search in DNS </span><span
style="font-size: 11pt; font-family: Wingdings; color:
rgb(31, 73, 125);" lang="EN-US">J</span><span
style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US">For all CNAME records, make e.g. a
TXT record with the reverse result : <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US">(TXT is maybe not the better record
type…which ones (for specialists))<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US">For each : <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US">a-name IN A 1.2.3.4<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US">an-alias IN CNAME a-name<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US">Just add : <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US">a-name IN TXT an-alias<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US">and make more than one TXT records
for each cname pointing to the same record …<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US">a-name IN TXT another-alias<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US">best regards<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US">Philippe<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);" lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size: 10pt;
font-family:
"Tahoma","sans-serif"; color:
windowtext;" lang="EN-US">From:</span></b><span
style="font-size: 10pt; font-family:
"Tahoma","sans-serif"; color:
windowtext;" lang="EN-US">
<a class="moz-txt-link-abbreviated" href="mailto:bind-users-bounces+philippe.simonet=swisscom.com@lists.isc.org">bind-users-bounces+philippe.simonet=swisscom.com@lists.isc.org</a>
[<a class="moz-txt-link-freetext" href="mailto:bind-users-bounces+philippe.simonet=swisscom.com@lists.isc.org">mailto:bind-users-bounces+philippe.simonet=swisscom.com@lists.isc.org</a>]
<b>On Behalf Of </b>Stacey Jonathan Marshall<br>
<b>Sent:</b> mardi 9 novembre 2010 16:53<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:bind-users@lists.isc.org">bind-users@lists.isc.org</a><br>
<b>Subject:</b> Re: How to get easily (from a script)
all CNAME of a A record?<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">On 09/11/2010 14:14, Michelle Konzack
wrote: <o:p></o:p></p>
<pre>Hello Matus UHLAR - fantomas,<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Am 2010-11-09 14:13:47, hacktest Du folgendes herunter:<o:p></o:p></pre>
<blockquote style="margin-top: 5pt; margin-bottom: 5pt;">
<pre>I am not sure whether dnswalk over whole internet can do that, but on your<o:p></o:p></pre>
</blockquote>
<pre><o:p> </o:p></pre>
<pre>I will try it...<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<blockquote style="margin-top: 5pt; margin-bottom: 5pt;">
<pre>server you can either run recursive grep over named data directory, or dump<o:p></o:p></pre>
<pre>the named dsatabase and grep it...<o:p></o:p></pre>
</blockquote>
<pre><o:p> </o:p></pre>
<pre>This is what I currently do...<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>----[ '/usr/sbin/get_hosts_in cname' ]----------------------------------<o:p></o:p></pre>
<pre>#!/bin/sh<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>QUERY="$1"<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>for FILE in $(cd /etc/bind && ls *.signed)<o:p></o:p></pre>
<pre>do<o:p></o:p></pre>
<pre> grep --regexp=" IN CNAME .*${QUERY}" /etc/bind/${FILE} 2>/dev/null |cut -d ' ' -f1 |sed 's|.$||'<o:p></o:p></pre>
<pre>done<o:p></o:p></pre>
<pre>------------------------------------------------------------------------<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>...and it is to slow do to more then 80.000 Zones (they have to be<o:p></o:p></pre>
<pre>greped all) number of VHosts.<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Oh, it is now time to use "xargs", because I saw today, that I hit the<o:p></o:p></pre>
<pre>limits for "ls". :-D<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Following is working:<o:p></o:p></pre>
<pre> cd /etc/bind && ls<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>but not:<o:p></o:p></pre>
<pre> cd /etc/bind && ls *<o:p></o:p></pre>
<pre>or<o:p></o:p></pre>
<pre> cd /etc/bind && ls *.signed<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>and the OSes are called Linux and BSD... WTF?<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>It seems that a commandline can not have more then 31.000 characters.<o:p></o:p></pre>
<pre>(no not options but total lenght)<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Thanks, Greetings and nice Day/Evening<o:p></o:p></pre>
<pre> Michelle Konzack<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<p class="MsoNormal">The asterisk causes the shell to expand
the names and run ls with them as a single command, so in
effect you have "ls file1 file2 file3 ...". Try the
following instead:<br>
<br>
<br>
<o:p></o:p></p>
<pre>cd /etc/bind<o:p></o:p></pre>
<pre>for FILE in *.signed<o:p></o:p></pre>
<pre>do<o:p></o:p></pre>
<pre> grep --regexp=" IN CNAME .*${QUERY}" ${FILE} 2>/dev/null |cut -d ' ' -f1 |sed 's|.$||'<o:p></o:p></pre>
<pre>done<o:p></o:p></pre>
<p class="MsoNormal">It might still have the same issue, but
worth a go.<br>
<br>
I assume the command length is also why your not simply
running "grep -h <expression> *.signed"?<br>
<br>
Stace<br>
<br>
<o:p></o:p></p>
<pre><o:p> </o:p></pre>
<pre><o:p> </o:p></pre>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>bind-users mailing list<o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="mailto:bind-users@lists.isc.org">bind-users@lists.isc.org</a><o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="https://lists.isc.org/mailman/listinfo/bind-users">https://lists.isc.org/mailman/listinfo/bind-users</a><o:p></o:p></pre>
<p class="MsoNormal"><o:p> </o:p></p>
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