127 lines
2.5 KiB
Perl
127 lines
2.5 KiB
Perl
#!perl -w
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=head1 NAME
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check_bogus_bounce - Check that a bounce message isn't bogus
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=head1 DESCRIPTION
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This plugin is designed to reject bogus bounce messages.
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In our case a bogus bounce message is defined as a bounce message
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which has more than a single recipient.
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=head1 CONFIGURATION
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Only a single argument is recognized and is assumed to be the default
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action. Valid settings are:
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=over 8
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=item log
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Merely log the receipt of the bogus bounce (the default behaviour).
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=item deny
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Deny with a hard error code.
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=item denysoft
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Deny with a soft error code.
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=back
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=cut
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=head1 AUTHOR
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Steve Kemp
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--
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http://steve.org.uk/Software/qpsmtpd/
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=cut
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=begin doc
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Look for our single expected argument and configure "action" appropriately.
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=end doc
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=cut
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sub register {
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my ($self, $qp, $arg, @nop) = (@_);
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#
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# Default behaviour is to merely log.
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#
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$self->{_action} = "log";
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#
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# Unless one was specified
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#
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if ($arg) {
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if ($arg =~ /^(log|deny|denysoft)$/i) {
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$self->{_action} = $arg;
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}
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else {
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die "Invalid argument '$arg' - use one of : log, deny, denysoft";
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}
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}
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}
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=begin doc
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Handle the detection of bounces here.
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If we find a match then we'll react with our expected action.
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=end doc
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=cut
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sub hook_data_post {
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my ($self, $transaction) = (@_);
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#
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# Find the sender, and return unless it wasn't a bounce.
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#
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my $sender = $transaction->sender->address || undef;
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return DECLINED unless ($sender eq "<>");
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#
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# Get the recipients.
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#
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my @to = $transaction->recipients || ();
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return DECLINED unless (scalar @to > 1);
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#
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# OK at this point we know:
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#
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# 1. It is a bounce, via the null-envelope.
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# 2. It is a bogus bounce, because there are more than one recipients.
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#
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if (lc $self->{_action} eq "log") {
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$self->log(LOGWARN,
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$self->plugin_name() . " bogus bounce for :" . join(",", @to));
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}
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elsif (lc $self->{_action} eq "deny") {
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return (DENY,
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$self->plugin_name() . " determined this to be a bogus bounce");
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}
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elsif (lc $self->{_action} eq "denysoft") {
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return (DENYSOFT,
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$self->plugin_name() . " determined this to be a bogus bounce");
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}
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else {
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$self->log(LOGWARN,
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$self->plugin_name() . " failed to determine action. bug?");
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}
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#
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# All done; allow this to proceed
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#
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return DECLINED;
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}
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