94 lines
2.8 KiB
Plaintext
94 lines
2.8 KiB
Plaintext
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#
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# This file is best read with ``perldoc advanced.pod''
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#
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###
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# Conventions:
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# plugin names: F<myplugin>, F<qpsmtpd-async>
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# constants: I<LOGDEBUG>
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# smtp commands, answers: B<HELO>, B<250 Queued!>
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#
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# Notes:
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# * due to restrictions of some POD parsers, no C<<$object->method()>>
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# are allowed, use C<$object-E<gt>method()>
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#
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=head1 Advanced Playground
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=head2 Discarding messages
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If you want to make the client think a message has been regularily accepted,
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but in real you delete it or send it to F</dev/null>, ..., use something
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like the following plugin and load it before your default queue plugin.
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sub hook_queue {
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my ($self, $transaction) = @_;
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if ($transaction->notes('discard_mail')) {
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my $msg_id = $transaction->header->get('Message-Id') || '';
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$msg_id =~ s/[\r\n].*//s;
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return(OK, "Queued! $msg_id");
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}
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return(DECLINED);
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}
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=head2 Changing return values
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This is an example how to use the C<isa_plugin> method.
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The B<rcpt_ok_maxrelay> plugin wraps the B<rcpt_ok> plugin. The B<rcpt_ok>
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plugin checks the F<rcpthosts> and F<morercpthosts> config files for
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domains, which we accept mail for. If not found it tells the
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client that relaying is not allowed. Clients which are marked as
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C<relay clients> are excluded from this rule. This plugin counts the
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number of unsuccessfull relaying attempts and drops the connection if
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too many were made.
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The optional parameter I<MAX_RELAY_ATTEMPTS> configures this plugin to drop
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the connection after I<MAX_RELAY_ATTEMPTS> unsuccessful relaying attempts.
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Set to C<0> to disable, default is C<5>.
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Note: Do not load both (B<rcpt_ok> and B<rcpt_ok_maxrelay>). This plugin
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should be configured to run I<last>, like B<rcpt_ok>.
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use Qpsmtpd::DSN;
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sub init {
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my ($self, $qp, @args) = @_;
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die "too many arguments"
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if @args > 1;
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$self->{_count_relay_max} = defined $args[0] ? $args[0] : 5;
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$self->isa_plugin("rcpt_ok");
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}
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sub hook_rcpt {
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my ($self, $transaction, $recipient) = @_;
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my ($rc, @msg) = $self->SUPER::hook_rcpt($transaction, $recipient);
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return ($rc, @msg)
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unless (($rc == DENY) and $self->{_count_relay_max});
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my $count =
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($self->qp->connection->notes('count_relay_attempts') || 0) + 1;
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$self->qp->connection->notes('count_relay_attempts', $count);
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return ($rc, @msg) unless ($count > $self->{_count_relay_max});
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return Qpsmtpd::DSN->relaying_denied(DENY_DISCONNECT,
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"Too many relaying attempts");
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}
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=head2 Results of other hooks
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B<NOTE:> just copied from README.plugins
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If we're in a transaction, the results of a callback are stored in
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$self->transaction->notes( $code->{name})->{"hook_$hook"}->{return}
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If we're in a connection, store things in the connection notes instead.
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B<FIXME>: does the above (regarding connection notes) work?
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=cut
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# vim: ts=2 sw=2 expandtab
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