How to get easily (from a script) all CNAME of a A record?

[Kevin Darcy]

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.

                                                                         
                                                                         
                                         - Kevin

On 11/9/2010 4:16 PM, Philippe.Simonet at swisscom.com wrote:
>
> Hi
>
> If you have control over all zones, you could also pre-store the 
> results of
>
> your search in DNS J
>
> For all CNAME records, make e.g. a TXT record with the reverse result :
>
> (TXT is maybe not the better record type...which ones (for specialists))
>
> For each :
>
> a-name IN A 1.2.3.4
>
> an-alias IN CNAME a-name
>
> Just add :
>
> a-name IN TXT an-alias
>
> and make more than one TXT records for each cname pointing to the same 
> record ...
>
> a-name IN TXT another-alias
>
> best regards
>
> Philippe
>
> *From:*bind-users-bounces+philippe.simonet=swisscom.com at lists.isc.org 
> [mailto:bind-users-bounces+philippe.simonet=swisscom.com at lists.isc.org] *On 
> Behalf Of *Stacey Jonathan Marshall
> *Sent:* mardi 9 novembre 2010 16:53
> *To:* bind-users at lists.isc.org
> *Subject:* Re: How to get easily (from a script) all CNAME of a A record?
>
> On 09/11/2010 14:14, Michelle Konzack wrote:
>
> Hello Matus UHLAR - fantomas,
>   
> Am 2010-11-09 14:13:47, hacktest Du folgendes herunter:
>
>     I am not sure whether dnswalk over whole internet can do that, but on your
>
>   
> I will try it...
>   
>
>     server you can either run recursive grep over named data directory, or dump
>
>     the named dsatabase and grep it...
>
>   
> This is what I currently do...
>   
> ----[ '/usr/sbin/get_hosts_in cname' ]----------------------------------
> #!/bin/sh
>   
> QUERY="$1"
>   
> for FILE in $(cd /etc/bind&&  ls *.signed)
> do
>    grep --regexp=" IN CNAME .*${QUERY}" /etc/bind/${FILE} 2>/dev/null |cut -d ' ' -f1 |sed 's|.$||'
> done
> ------------------------------------------------------------------------
>   
> ...and it is to slow do to more then  80.000  Zones  (they  have  to  be
> greped all) number of VHosts.
>   
> Oh, it is now time to use "xargs", because I saw today, that I  hit  the
> limits for "ls".  :-D
>   
> Following is working:
>      cd /etc/bind&&  ls
>   
> but not:
>      cd /etc/bind&&  ls *
> or
>      cd /etc/bind&&  ls *.signed
>   
> and the OSes are called Linux and BSD...  WTF?
>   
> It seems that a commandline can not have more then 31.000 characters.
> (no not options but total lenght)
>   
> Thanks, Greetings and nice Day/Evening
>      Michelle Konzack
>   
>
> 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:
>
>
> cd /etc/bind
> for FILE in *.signed
> do
>    grep --regexp=" IN CNAME .*${QUERY}" ${FILE} 2>/dev/null |cut -d ' ' -f1 |sed 's|.$||'
> done
>
> It might still have the same issue, but worth a go.
>
> I assume the command length is also why your not simply running "grep 
> -h <expression> *.signed"?
>
> Stace
>
>   
>   
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