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Mail::SpamAssassin::DnUseroContributed PerMail::SpamAssassin::DnsResolver(3pm)

       Mail::SpamAssassin::DnsResolver - DNS resolution engine

       This is a DNS resolution engine for SpamAssassin, implemented in order
       to reduce file descriptor usage by Net::DNS and avoid a response
       collision bug in that module.

           Load the "Net::DNS::Resolver" object.  Returns 0 if Net::DNS cannot
           be used, 1 if it is available.

       $resolver = $res->get_resolver()
           Return the "Net::DNS::Resolver" object.

           Wrapper for Net::DNS::Resolver->nameservers to get or set list of

           Re-connect to the first nameserver listed in "/etc/resolv.conf" or
           similar platform-dependent source, as provided by "Net::DNS".

           Return the "IO::Socket::INET" object used to communicate with the

       $packet = new_dns_packet ($host, $type, $class)
           A wrapper for "Net::DNS::Packet::new()" which traps a die thrown by

           To use this, change calls to "Net::DNS::Resolver::bgsend" from:

               $res->bgsend($hostname, $type);


               $res->bgsend(Mail::SpamAssassin::DnsResolver::new_dns_packet($hostname, $type, $class));

       $id = $res->bgsend($host, $type, $class, $cb)
           Quite similar to "Net::DNS::Resolver::bgsend", except that when a
           response packet eventually arrives, and "poll_responses" is called,
           the callback sub reference $cb will be called.

           Note that $type and $class may be "undef", in which case they will
           default to "A" and "IN", respectively.

           The callback sub will be called with three arguments -- the packet
           that was delivered, and an id string that fingerprints the query
           packet and the expected reply. The third argument is a timestamp
           (Unix time, floating point), captured at the time the packet was
           collected. It is expected that a closure callback be used, like so:

             my $id = $self->{resolver}->bgsend($host, $type, undef, sub {
                   my ($reply, $reply_id, $timestamp) = @_;
                   $self->got_a_reply ($reply, $reply_id);

           The callback can ignore the reply as an invalid packet sent to the
           listening port if the reply id does not match the return value from

       $nfound = $res->poll_responses()
           See if there are any "bgsend" response packets ready, and return
           the number of such packets delivered to their callbacks.

           Call this to release pending requests from memory, when aborting
           backgrounded requests, or when the scan is complete.
           "Mail::SpamAssassin::PerMsgStatus::check" calls this before

       $packet = $res->send($name, $type, $class)
           Emulates "Net::DNS::Resolver::send()".

           Little more than a stub for callers expecting this from

           If called immediately after a call to $res->send this will return
           "query timed out" if the $res->send DNS query timed out.  Otherwise
           "unknown error or no error" will be returned.

           No other errors are reported.

           Reset socket when done with it.

           Clean up for destruction.

perl v5.10.0                      2008-06-Mail::SpamAssassin::DnsResolver(3pm)