How to get easily (from a script) all CNAME of a A record?
Stacey Jonathan Marshall
stacey.marshall at oracle.com
Tue Nov 9 15:52:32 UTC 2010
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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