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#!/usr/bin/perl
# Copyright © 2013 Guilhem Moulin <guilhem@fripost.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
use warnings;
use strict;
use Net::LDAPI;
use Net::LDAP::Util qw/escape_filter_value ldap_explode_dn escape_dn_value/;
use Authen::SASL;
use Net::SMTP;
if (!@ARGV or grep { $_ eq '-h' or $_ eq '--help' } @ARGV) {
# Help
print STDERR "Usage: $0 {original sender} {original recipient} [additional recipient ...]\n";
print STDERR "\n";
print STDERR "The message read from the standard input is redirected to 'additional recipient',\n";
print STDERR "and also forwarded to the domain owner if any. If the 'additional recipient' begins\n";
print STDERR "with '\@', the localpart of 'original recipient' is prepended.\n";
print STDERR "\n";
print STDERR "This is mostly useful to comply to RFC 822 section 6.3 and RFC 2142 section\n";
print STDERR "4 (to forward mails to 'admin\@' and 'postmaster\@' to the site admin in\n";
print STDERR "addition to the virtual domain manager).\n";
exit;
}
# The original sender
my $sender = shift;
# The original recipient
my $orig = shift;
$orig =~ /^(.+)\@([^@]+)$/
or warn "Warning: Non fully qualified: $orig";
my ($local,$domain) = ($1,$2);
# The new recipient (typically, the admin site)
my @recipients = grep { $_ and $orig ne $_ }
# add localparts to domain
map { my $x = $_;
if ($x =~ /^\@/) {
$x = (defined $local and $local ne '') ? $local.$x : undef;
}
$x
}
@ARGV;
# Die if we can't deliver to site admins
die "Error: Aborted delivery to '$orig' in attempt to break an alias expansion loop.\n"
unless @recipients;
if (defined $domain) {
# Look for the domain owner or postmaster
my $ldap = Net::LDAPI::->new();
$ldap->bind( undef, sasl => Authen::SASL::->new(mechanism => 'EXTERNAL') )
or die "Error: Couldn't bind";
my @attrs = ( 'fripostPostmaster', 'fripostOwner' );
my $mesg = $ldap->search( base => 'fvd='.escape_dn_value($domain).','
.'ou=virtual,dc=fripost,dc=org'
, scope => 'base'
, deref => 'never'
, filter => '(&(objectClass=FripostVirtualDomain)'
.'(fvd='.escape_filter_value($domain).')'.
')'
, attrs => \@attrs
);
if ($mesg->code) {
warn "Warning: ".$mesg->error;
}
elsif ($mesg->count != 1) {
# Note: this may happen for "$mydestination", but these mails
# are unlikely. We'll get a harmless warning at worst.
warn "Warning: Something weird happened when looking up domain '".$domain.
"'. Check your ACL.";
}
else {
my $entry = $mesg->pop_entry() // die "Error: Cannot pop entry.";
foreach (@attrs) {
my $v = $entry->get_value($_, asref => 1) or next;
foreach my $dn (@$v) {
my $dn2 = ldap_explode_dn($dn, casefold => 'lower');
my $l = $dn2->[0]->{fvl};
my $d = $dn2->[1]->{fvd};
if ($l ne '' and $d ne '') {
push @recipients, $l.'@'.$d;
}
else {
warn "Warning: Invalid DN: $dn"
}
}
}
}
$ldap->unbind;
}
my $smtp = Net::SMTP::->new( 'localhost:25', Timeout => 1200 );
$smtp->mail($sender);
$smtp->to(@recipients, { Notify => ['FAILURE','DELAY'], SkipBad => 1 });
$smtp->data(<STDIN>);
$smtp->quit;
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