[net-dns-users] handling unsupported record types

[Chris Buxton]

Dick,

I'm not using eval (or wasn't until I saw your code sample), and this script in particular is not threaded.

My workstation is Mac OS X 10.8. The client was using Windows and ActivePerl (latest).

Regards,
Chris Buxton

On May 31, 2013, at 3:02 PM, Dick Franks <rwfranks at acm.org> wrote:

> Please can you let us know platform and perl revision info.
> 
> Others have reported issues with eval{...} and threads
> 
> Dick Franks
> 
> --
> 
> 
> On 31 May 2013 22:15, Chris Buxton <clists at buxtonfamily.us> wrote:
> The problem occurred with Net::DNS 0.72. I was not using Net::DNS::ZoneFile to read the zone from disk.
> 
> After reading these comments, I tried the script locally, on my development workstation, and it worked fine. On the client's workstation, it failed, despite having the same version of Net::DNS. I have no explanation.
> 
> Thanks for the guidance.
> Chris Buxton
> 
> On May 22, 2013, at 2:30 PM, Dick Franks <rwfranks at acm.org> wrote:
> 
>> Chris,
>> 
>> Revision of Net::DNS?
>> 
>> I do not understand why a zone transfer would fail in the way you describe.
>> 
>> Are you using Net::DNS::ZoneFile to read your zone data from disk?
>> 
>> There should be no need to hack RR.pm.
>> Your script needs to handle the exception condition.
>> 
>>     my $zone = new Net::DNS::ZoneFile( $filename );
>>     
>>     loop { # through RRs in zone file
>> 
>>         my $rr = eval { $zone->read; };        # which knows about multi-line RRs
>>         if ( $@ ) {
>>             warn $@;
>>             next;
>>         }
>> 
>>         last unless $rr;
>> 
>>         # process RR
>> 
>>     }
>> 
>> 
>> Regards
>> 
>> Dick Franks
>> 
>> --
>> 
>> 
>> On 22 May 2013 20:30, Chris Buxton <clists at buxtonfamily.us> wrote:
>> I have a script that reads zones from files on disk and also via zone transfer. Currently, when reading in data, if the script encounters a record for which Net::DNS does not implement a record type class, the script dies. The immediate case looks like this:
>> 
>> WKS not implemented at /usr/lib/perl5/site_perl/5.14/i686-cygwin-threads-64int/Net/DNS/RR.pm line 630.
>> new Net:NS::RR( ... ) at ./dnsdiff.pl line 300
>> 
>> Short of hacking Net::DNS::RR, how can I handle this without dying and without losing any records coming after the unknown record type in a zone transfer?
>> 
>> Regards,
>> Chris Buxton
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