Bug #56583 for Net-DNS:

Wed Apr 14 04:51:05 2010 douzzer [...] mega.nu - Ticket created

Net::DNS::Resolver::Base::query() fails (returns undef) if there are no RR's in the answer section. This is a serious problem, because authoritative servers (BIND 9, at least) return delegations (NS, DS, RRSIG) entirely in the authority section and return an empty answer section. (The additional section may of course have RRs.) I found that doing this at line 464 in Base.pm DTRT: if ($packet->header->ancount || $packet->header->nscount) { return $packet; } else { return undef; } At line 442, I also made this substitution: return $packet if ($packet->header->ancount || $packet->header->nscount); # answer found

Wed Apr 14 14:19:26 2010 rwfranks [...] acm.org - Correspondence added

From:

rwfranks [...] acm.org

On Wed Apr 14 04:51:05 2010, douzzer wrote: Show quoted text

> Net::DNS::Resolver::Base::query() fails (returns undef) if there are

no RR's in the answer section. This is expected and well-documented behaviour, NOT a bug. Run perldoc Net::DNS::Resolver to see the following explanation and advice. --Dick query $packet = $res->query('mailhost'); $packet = $res->query('mailhost.example.com'); $packet = $res->query('192.168.1.1'); $packet = $res->query('example.com', 'MX'); $packet = $res->query('user.passwd.example.com', 'TXT', 'HS'); Performs a DNS query for the given name; the search list is not applied. If the name doesn’t contain any dots and defnames is true then the default domain will be appended. The record type and class can be omitted; they default to A and IN. If the name looks like an IP address (IPv4 or IPv6), then an appropriate PTR query will be performed. Returns a "Net::DNS::Packet" object, or "undef" if no answers were found. If you need to examine the response packet whether it contains any answers or not, use the send() method instead. send $packet = $res->send($packet_object); $packet = $res->send('mailhost.example.com'); $packet = $res->send('example.com', 'MX'); $packet = $res->send('user.passwd.example.com', 'TXT', 'HS'); Performs a DNS query for the given name. Neither the searchlist nor the default domain will be appended.

Wed Apr 14 14:19:27 2010 The RT System itself - Status changed from 'new' to 'open'

Mon Jan 17 08:01:11 2011 willem [...] cpan.org - Correspondence added

Hi douzzer, As Dick mentions this is the correct behaviour, and send should be used if you wish to inspect the other packet data. Regards, Willem On Wed Apr 14 14:19:26 2010, rwfranks@acm.org wrote: Show quoted text

> On Wed Apr 14 04:51:05 2010, douzzer wrote:

> > Net::DNS::Resolver::Base::query() fails (returns undef) if there are

> no RR's in the answer section. > > > This is expected and well-documented behaviour, NOT a bug. > Run perldoc Net::DNS::Resolver to see the following explanation and

advice. Show quoted text

> > --Dick > > > query > > $packet = $res->query('mailhost'); > $packet = $res->query('mailhost.example.com'); > $packet = $res->query('192.168.1.1'); > $packet = $res->query('example.com', 'MX'); > $packet = $res->query('user.passwd.example.com', 'TXT', 'HS'); > > Performs a DNS query for the given name; the search list is not > applied. If the name doesn’t contain any dots and > defnames is true then the default domain will be appended. > > The record type and class can be omitted; they default to A and IN. > If the name looks like an IP address (IPv4 or > IPv6), then an appropriate PTR query will be performed. > > Returns a "Net::DNS::Packet" object, or "undef" if no answers were > found. If you need to examine the response packet > whether it contains any answers or not, use the send() method instead. > > > send > > $packet = $res->send($packet_object); > $packet = $res->send('mailhost.example.com'); > $packet = $res->send('example.com', 'MX'); > $packet = $res->send('user.passwd.example.com', 'TXT', 'HS'); > > Performs a DNS query for the given name. Neither the searchlist nor > the default domain will be appended. > >

Mon Jan 17 08:01:11 2011 willem [...] cpan.org - Status changed from 'open' to 'rejected'