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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.

           Get a list of nameservers as configured by dns_server directives or
           as provided by Net::DNS, typically from /etc/resolv.conf

           Get or set a list of currently available nameservers, which is
           typically a known-to-be-good subset of configured nameservers

           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

       $packet = new_dns_packet ($domain, $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:

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


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

       $id = $res->bgsend($domain, $type, $class, $cb)
           Quite similar to "Net::DNS::Resolver::bgsend", except that when a
           reply 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 = $self->{resolver}->bgsend($domain, $type, undef, sub {
                   my ($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

       $id = $res->bgread()
           Similar to "Net::DNS::Resolver::bgread".  Reads a DNS packet from a
           supplied socket, decodes it, and returns a Net::DNS::Packet object
           if successful.  Dies on error.

       $nfound = $res->poll_responses()
           See if there are any "bgsend" reply 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()".

           This subroutine is a simple synchronous leftover from SpamAssassin
           version 3.3 and does not participate in packet query caching and
           callback grouping as implemented by
           AsyncLoop::bgsend_and_start_lookup().  As such it should be avoided
           for mainstream usage.  Currently used through Mail::SPF::Server by
           the SPF plugin.

           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 v5.20.2                      2020-02-Mail::SpamAssassin::DnsResolver(3pm)

Czas wygenerowania: 0.00014 sek.

Created with the man page lookup class by Andrew Collington.
Based on a C man page viewer by Vadim Pavlov
Unicode soft-hyphen fix (as used by RedHat) by Dan Edwards
Some optimisations by Eli Argon
Caching idea and code contribution by James Richardson

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