628 lines
13 KiB
Perl
628 lines
13 KiB
Perl
#
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# Enhanced Mail System Status Codes - RFC 1893
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#
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package Qpsmtpd::DSN;
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use strict;
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use Qpsmtpd::Constants;
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=head1 NAME
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Qpsmtpd::DSN - Enhanced Mail System Status Codes - RFC 1893
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=head1 DESCRIPTION
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The B<Qpsmtpd::DSN> implements the I<Enhanced Mail System Status Codes> from
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RFC 1893.
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=head1 USAGE
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Any B<qpsmtpd> plugin can access these status codes. All sub routines are used
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the same way:
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use Qpsmtpd::DSN;
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...;
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return Qpsmtpd::DSN->relaying_denied();
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or
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return Qpsmtpd::DSN->relaying_denied("Relaying from $ip denied");
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or
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return Qpsmtpd::DSN->relaying_denied(DENY,"Relaying from $ip denied");
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If no status message was given, it will use the predefined one from the
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RFC. If the first argument is numeric, it will use this as a return code,
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else the default return code is used. See below which default return code
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is used in the different functions.
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The first example will return
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I<(DENY, "Relaying denied");>
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the others
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I<(DENY, "Relaying from $ip denied");>
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which will be returned to qpsmtpd.
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In those sub routines which don't start with I<addr_, sys_, net_, proto_,
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media_, sec_> I've added a default message which describes the status better
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than the RFC message.
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=cut
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my @rfc1893 = (
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[
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"Other or Undefined Status", # x.0.x
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],
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[
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"Other address status.", # x.1.0
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"Bad destination mailbox address.", # x.1.1
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"Bad destination system address.", # x.1.2
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"Bad destination mailbox address syntax.", # x.1.3
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"Destination mailbox address ambiguous.", # x.1.4
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"Destination address valid.", # x.1.5
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"Destination mailbox has moved, No forwarding address.", # x.1.6
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"Bad sender's mailbox address syntax.", # x.1.7
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"Bad sender's system address.", # x.1.8
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],
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[
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"Other or undefined mailbox status.", # x.2.0
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"Mailbox disabled, not accepting messages.", # x.2.1
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"Mailbox full.", # x.2.2
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"Message length exceeds administrative limit.", # x.2.3
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"Mailing list expansion problem.", # x.2.4
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],
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[
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"Other or undefined mail system status.", # x.3.0
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"Mail system full.", # x.3.1
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"System not accepting network messages.", # x.3.2
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"System not capable of selected features.", # x.3.3
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"Message too big for system.", # x.3.4
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"System incorrectly configured.", # x.3.5
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],
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[
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"Other or undefined network or routing status.", # x.4.0
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"No answer from host.", # x.4.1
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"Bad connection.", # x.4.2
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"Directory server failure.", # x.4.3
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"Unable to route.", # x.4.4
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"Mail system congestion.", # x.4.5
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"Routing loop detected.", # x.4.6
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"Delivery time expired.", # x.4.7
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],
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[
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"Other or undefined protocol status.", # x.5.0
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"Invalid command.", # x.5.1
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"Syntax error.", # x.5.2
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"Too many recipients.", # x.5.3
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"Invalid command arguments.", # x.5.4
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"Wrong protocol version.", # x.5.5
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],
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[
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"Other or undefined media error.", # x.6.0
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"Media not supported.", # x.6.1
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"Conversion required and prohibited.", # x.6.2
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"Conversion required but not supported.", # x.6.3
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"Conversion with loss performed.", # x.6.4
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"Conversion Failed.", # x.6.5
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],
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[
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"Other or undefined security status.", # x.7.0
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"Delivery not authorized, message refused.", # x.7.1
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"Mailing list expansion prohibited.", # x.7.2
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"Security conversion required but not possible.", # x.7.3
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"Security features not supported.", # x.7.4
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"Cryptographic failure.", # x.7.5
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"Cryptographic algorithm not supported.", # x.7.6
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"Message integrity failure.", # x.7.7
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],
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);
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sub _status {
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my $return = shift;
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my $const = Qpsmtpd::Constants::return_code($return);
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if ($const =~ /^DENYSOFT/) {
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return 4;
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}
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elsif ($const =~ /^DENY/) {
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return 5;
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}
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elsif ($const eq 'OK' or $const eq 'DONE') {
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return 2;
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}
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else { # err .... no :)
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return 4; # just 2,4,5 are allowed.. temp error by default
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}
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}
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sub _dsn {
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my ($self, $return, $reason, $default, $subject, $detail) = @_;
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if (!defined $return) {
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$return = $default;
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}
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elsif ($return !~ /^\d+$/) {
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$reason = $return;
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$return = $default;
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}
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my $msg = $rfc1893[$subject][$detail];
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unless (defined $msg) {
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$detail = 0;
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$msg = $rfc1893[$subject][$detail];
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unless (defined $msg) {
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$subject = 0;
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$msg = $rfc1893[$subject][$detail];
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}
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}
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my $class = &_status($return);
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if (defined $reason) {
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$msg = $reason;
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}
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return ($return, "$msg (#$class.$subject.$detail)");
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}
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sub unspecified { shift->_dsn(shift, shift, DENYSOFT, 0, 0); }
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=head1 ADDRESS STATUS
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=over 9
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=item addr_unspecified
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X.1.0
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default: DENYSOFT
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=cut
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sub addr_unspecified { shift->_dsn(shift, shift, DENYSOFT, 1, 0); }
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=item no_such_user, addr_bad_dest_mbox
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X.1.1
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default: DENY
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=cut
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sub no_such_user { shift->_dsn(shift, (shift || "No such user"), DENY, 1, 1); }
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sub addr_bad_dest_mbox { shift->_dsn(shift, shift, DENY, 1, 1); }
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=item addr_bad_dest_system
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X.1.2
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default: DENY
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=cut
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sub addr_bad_dest_system { shift->_dsn(shift, shift, DENY, 1, 2); }
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=item addr_bad_dest_syntax
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X.1.3
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default: DENY
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=cut
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sub addr_bad_dest_syntax { shift->_dsn(shift, shift, DENY, 1, 3); }
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=item addr_dest_ambigous
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X.1.4
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default: DENYSOFT
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=cut
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sub addr_dest_ambigous { shift->_dsn(shift, shift, DENYSOFT, 1, 4); }
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=item addr_rcpt_ok
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X.1.5
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default: OK
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=cut
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# XXX: do we need this? Maybe in all address verifying plugins?
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sub addr_rcpt_ok { shift->_dsn(shift, shift, OK, 1, 5); }
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=item addr_mbox_moved
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X.1.6
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default: DENY
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=cut
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sub addr_mbox_moved { shift->_dsn(shift, shift, DENY, 1, 6); }
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=item addr_bad_from_syntax
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X.1.7
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default: DENY
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=cut
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sub addr_bad_from_syntax { shift->_dsn(shift, shift, DENY, 1, 7); }
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=item addr_bad_from_system
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X.1.8
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default: DENY
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=back
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=cut
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sub addr_bad_from_system { shift->_dsn(shift, shift, DENY, 1, 8); }
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=head1 MAILBOX STATUS
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=over 5
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=item mbox_unspecified
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X.2.0
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default: DENYSOFT
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=cut
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sub mbox_unspecified { shift->_dsn(shift, shift, DENYSOFT, 2, 0); }
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=item mbox_disabled
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X.2.1
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default: DENY ...but RFC says:
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The mailbox exists, but is not accepting messages. This may
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be a permanent error if the mailbox will never be re-enabled
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or a transient error if the mailbox is only temporarily
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disabled.
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=cut
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sub mbox_disabled { shift->_dsn(shift, shift, DENY, 2, 1); }
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=item mbox_full
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X.2.2
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default: DENYSOFT
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=cut
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sub mbox_full { shift->_dsn(shift, shift, DENYSOFT, 2, 2); }
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=item mbox_msg_too_long
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X.2.3
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default: DENY
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=cut
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sub mbox_msg_too_long { shift->_dsn(shift, shift, DENY, 2, 3); }
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=item mbox_list_expansion_problem
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X.2.4
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default: DENYSOFT
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=back
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=cut
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sub mbox_list_expansion_problem { shift->_dsn(shift, shift, DENYSOFT, 2, 4); }
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=head1 MAIL SYSTEM STATUS
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=over 4
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=item sys_unspecified
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X.3.0
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default: DENYSOFT
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=cut
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sub sys_unspecified { shift->_dsn(shift, shift, DENYSOFT, 3, 0); }
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=item sys_disk_full
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X.3.1
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default: DENYSOFT
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=cut
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sub sys_disk_full { shift->_dsn(shift, shift, DENYSOFT, 3, 1); }
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=item sys_not_accepting_mail
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X.3.2
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default: DENYSOFT
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=cut
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sub sys_not_accepting_mail { shift->_dsn(shift, shift, DENYSOFT, 3, 2); }
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=item sys_not_supported
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X.3.3
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default: DENYSOFT
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Selected features specified for the message are not
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supported by the destination system. This can occur in
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gateways when features from one domain cannot be mapped onto
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the supported feature in another.
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=cut
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sub sys_not_supported { shift->_dsn(shift, shift, DENYSOFT, 3, 3); }
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=item sys_msg_too_big
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X.3.4
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default DENY
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=back
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=cut
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sub sys_msg_too_big { shift->_dsn(shift, shift, DENY, 3, 4); }
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=head1 NETWORK AND ROUTING STATUS
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=cut
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=over 4
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=item net_unspecified
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X.4.0
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default: DENYSOFT
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=cut
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sub net_unspecified { shift->_dsn(shift, shift, DENYSOFT, 4, 0); }
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# not useful # sub net_no_answer { shift->_dsn(shift,shift,4,1); }
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# not useful # sub net_bad_connection { shift->_dsn(shift,shift,4,2); }
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=item net_directory_server_failed, temp_resolver_failed
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X.4.3
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default: DENYSOFT
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=cut
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sub temp_resolver_failed {
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shift->_dsn(shift, (shift || "Temporary address resolution failure"),
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DENYSOFT, 4, 3);
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}
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sub net_directory_server_failed { shift->_dsn(shift, shift, DENYSOFT, 4, 3); }
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# not useful # sub net_unable_to_route { shift->_dsn(shift,shift,4,4); }
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=item net_system_congested
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X.4.5
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default: DENYSOFT
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=cut
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sub net_system_congested { shift->_dsn(shift, shift, DENYSOFT, 4, 5); }
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=item net_routing_loop, too_many_hops
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X.4.6
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default: DENY, but RFC says:
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A routing loop caused the message to be forwarded too many
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times, either because of incorrect routing tables or a user
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forwarding loop. This is useful only as a persistent
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transient error.
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Why do we want to DENYSOFT something like this?
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=back
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=cut
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sub net_routing_loop { shift->_dsn(shift, shift, DENY, 4, 6); }
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sub too_many_hops {
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shift->_dsn(shift, (shift || "Too many hops"), DENY, 4, 6,);
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}
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# not useful # sub delivery_time_expired { shift->_dsn(shift,shift,4,7); }
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=head1 MAIL DELIVERY PROTOCOL STATUS
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=over 6
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=item proto_unspecified
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X.5.0
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default: DENYSOFT
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=cut
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sub proto_unspecified { shift->_dsn(shift, shift, DENYSOFT, 5, 0); }
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=item proto_invalid_command
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X.5.1
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default: DENY
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=cut
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sub proto_invalid_command { shift->_dsn(shift, shift, DENY, 5, 1); }
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=item proto_syntax_error
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X.5.2
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default: DENY
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=cut
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sub proto_syntax_error { shift->_dsn(shift, shift, DENY, 5, 2); }
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=item proto_rcpt_list_too_long, too_many_rcpts
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X.5.3
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default: DENYSOFT
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=cut
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sub proto_rcpt_list_too_long { shift->_dsn(shift, shift, DENYSOFT, 5, 3); }
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sub too_many_rcpts { shift->_dsn(shift, shift, DENYSOFT, 5, 3); }
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=item proto_invalid_cmd_args
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X.5.4
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default: DENY
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=cut
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sub proto_invalid_cmd_args { shift->_dsn(shift, shift, DENY, 5, 4); }
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=item proto_wrong_version
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X.5.5
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default: DENYSOFT
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=back
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=cut
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sub proto_wrong_version { shift->_dsn(shift, shift, DENYSOFT, 5, 5); }
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=head1 MESSAGE CONTENT OR MESSAGE MEDIA STATUS
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=over 5
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=item media_unspecified
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X.6.0
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default: DENYSOFT
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=cut
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sub media_unspecified { shift->_dsn(shift, shift, DENYSOFT, 6, 0); }
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=item media_unsupported
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X.6.1
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default: DENY
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=cut
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sub media_unsupported { shift->_dsn(shift, shift, DENY, 6, 1); }
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=item media_conv_prohibited
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X.6.2
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default: DENY
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=cut
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sub media_conv_prohibited { shift->_dsn(shift, shift, DENY, 6, 2); }
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=item media_conv_unsupported
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X.6.3
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default: DENYSOFT
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=cut
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sub media_conv_unsupported { shift->_dsn(shift, shift, DENYSOFT, 6, 3); }
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=item media_conv_lossy
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X.6.4
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default: DENYSOFT
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=back
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=cut
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sub media_conv_lossy { shift->_dsn(shift, shift, DENYSOFT, 6, 4); }
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=head1 SECURITY OR POLICY STATUS
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=over 8
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=item sec_unspecified
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X.7.0
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default: DENYSOFT
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=cut
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sub sec_unspecified { shift->_dsn(shift, shift, DENYSOFT, 7, 0); }
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=item sec_sender_unauthorized, bad_sender_ip, relaying_denied
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X.7.1
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default: DENY
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=cut
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sub sec_sender_unauthorized { shift->_dsn(shift, shift, DENY, 7, 1); }
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sub bad_sender_ip {
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shift->_dsn(shift, (shift || "Bad sender's IP"), DENY, 7, 1,);
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}
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sub relaying_denied {
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shift->_dsn(shift, (shift || "Relaying denied"), DENY, 7, 1);
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}
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=item sec_list_dest_prohibited
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X.7.2
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default: DENY
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=cut
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sub sec_list_dest_prohibited { shift->_dsn(shift, shift, DENY, 7, 2); }
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=item sec_conv_failed
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X.7.3
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default: DENY
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=cut
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sub sec_conv_failed { shift->_dsn(shift, shift, DENY, 7, 3); }
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=item sec_feature_unsupported
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X.7.4
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default: DENY
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=cut
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sub sec_feature_unsupported { shift->_dsn(shift, shift, DENY, 7, 4); }
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=item sec_crypto_failure
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X.7.5
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default: DENY
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=cut
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sub sec_crypto_failure { shift->_dsn(shift, shift, DENY, 7, 5); }
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=item sec_crypto_algorithm_unsupported
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X.7.6
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default: DENYSOFT
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=cut
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sub sec_crypto_algorithm_unsupported {
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shift->_dsn(shift, shift, DENYSOFT, 7, 6);
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}
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=item sec_msg_integrity_failure
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X.7.7
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default: DENY
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=back
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=cut
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sub sec_msg_integrity_failure { shift->_dsn(shift, shift, DENY, 7, 7); }
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1;
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# vim: st=4 sw=4 expandtab
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