qpsmtpd/plugins/rcpt_ok

#!perl -w

=head1 NAME

rcpt_ok

=head1 SYNOPSIS

this plugin checks the standard rcpthosts config

=head1 DESCRIPTION

Check the recipient hostname and determine if we accept mail to that host.

This is functionally identical to qmail's rcpthosts implementation, consulting
both rcpthosts and morercpthosts.cdb.

=head1 CONFIGURATION

It should be configured to be run _LAST_!

=cut

use strict;
use warnings;

use Qpsmtpd::Constants;
use Qpsmtpd::DSN;

sub hook_rcpt {
  my ($self, $transaction, $recipient, %param) = @_;

  # Allow 'no @' addresses for 'postmaster' and 'abuse'
  # qmail-smtpd will do this for all users without a domain, but we'll
  # be a bit more picky.  Maybe that's a bad idea.
    my $host = $self->get_rcpt_host( $recipient ) or return (OK);

    return (OK) if $self->is_in_rcpthosts( $host );
    return (OK) if $self->is_in_morercpthosts( $host );
    return (OK) if $self->qp->connection->relay_client;  # failsafe

    # default of relaying_denied is obviously DENY,
    # we use the default "Relaying denied" message...
    return Qpsmtpd::DSN->relaying_denied();
}

sub is_in_rcpthosts {
    my ( $self, $host ) = @_;

    my @rcpt_hosts = ($self->qp->config('me'), $self->qp->config('rcpthosts'));

    # Check if this recipient host is allowed
    for my $allowed (@rcpt_hosts) {
        $allowed =~ s/^\s*(\S+)/$1/;
        if ( $host eq lc $allowed ) {
            $self->log( LOGINFO, "pass: $host in rcpthosts" );
            return 1;
        };

        if ( substr($allowed,0,1) eq '.' and $host =~ m/\Q$allowed\E$/i ) {
            $self->log( LOGINFO, "pass: $host in rcpthosts as $allowed" );
            return 1;
        };
    }

    return;
};

sub is_in_morercpthosts {
    my ( $self, $host ) = @_;

    my $more_rcpt_hosts = $self->qp->config('morercpthosts', 'map');

    if ( exists $more_rcpt_hosts->{$host} ) {
        $self->log( LOGINFO, "pass: $host found in morercpthosts" );
        return 1;
    };

    $self->log( LOGINFO, "fail: $host not in morercpthosts" );
    return;
};

sub get_rcpt_host {
    my ( $self, $recipient ) = @_;

    return if ! $recipient;  # Qpsmtpd::Address couldn't parse the recipient

    if ( $recipient->host ) {
        return lc $recipient->host;
    };

    # no host portion exists
    my $user = $recipient->user or return;
    if ( lc $user eq 'postmaster' || lc $user eq 'abuse' ) {
        return $self->qp->config('me');
    };
    return;
};