583 lines
24 KiB
Perl
583 lines
24 KiB
Perl
package Sisimai::Bite::Email::Exim;
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use parent 'Sisimai::Bite::Email';
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use feature ':5.10';
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use strict;
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use warnings;
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my $Indicators = __PACKAGE__->INDICATORS;
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my $StartingOf = {
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'deliverystatus' => ['Content-type: message/delivery-status'],
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'endof' => ['__END_OF_EMAIL_MESSAGE__'],
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};
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my $MarkingsOf = {
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# Error text regular expressions which defined in exim/src/deliver.c
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#
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# deliver.c:6292| fprintf(f,
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# deliver.c:6293|"This message was created automatically by mail delivery software.\n");
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# deliver.c:6294| if (to_sender)
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# deliver.c:6295| {
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# deliver.c:6296| fprintf(f,
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# deliver.c:6297|"\nA message that you sent could not be delivered to one or more of its\n"
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# deliver.c:6298|"recipients. This is a permanent error. The following address(es) failed:\n");
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# deliver.c:6299| }
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# deliver.c:6300| else
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# deliver.c:6301| {
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# deliver.c:6302| fprintf(f,
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# deliver.c:6303|"\nA message sent by\n\n <%s>\n\n"
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# deliver.c:6304|"could not be delivered to one or more of its recipients. The following\n"
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# deliver.c:6305|"address(es) failed:\n", sender_address);
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# deliver.c:6306| }
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#
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# deliver.c:6423| if (bounce_return_body) fprintf(f,
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# deliver.c:6424|"------ This is a copy of the message, including all the headers. ------\n");
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# deliver.c:6425| else fprintf(f,
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# deliver.c:6426|"------ This is a copy of the message's headers. ------\n");
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'alias' => qr/\A([ ]+an undisclosed address)\z/,
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'message' => qr{\A(?>
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This[ ]message[ ]was[ ]created[ ]automatically[ ]by[ ]mail[ ]delivery[ ]software[.]
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|A[ ]message[ ]that[ ]you[ ]sent[ ]was[ ]rejected[ ]by[ ]the[ ]local[ ]scanning[ ]code
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|A[ ]message[ ]that[ ]you[ ]sent[ ]contained[ ]one[ ]or[ ]more[ ]recipient[ ]addresses[ ]
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|Message[ ].+[ ](?:has[ ]been[ ]frozen|was[ ]frozen[ ]on[ ]arrival)
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|The[ ].+[ ]router[ ]encountered[ ]the[ ]following[ ]error[(]s[)]:
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)
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}x,
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'frozen' => qr/\AMessage .+ (?:has been frozen|was frozen on arrival)/,
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'rfc822' => qr{\A(?:
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[-]+[ ]This[ ]is[ ]a[ ]copy[ ]of[ ](?:the|your)[ ]message.+headers[.][ ][-]+
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|Content-Type:[ ]*message/rfc822
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)\z
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}x,
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};
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my $ReCommands = [
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# transports/smtp.c:564| *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
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# transports/smtp.c:837| string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
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qr/SMTP error from remote (?:mail server|mailer) after ([A-Za-z]{4})/,
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qr/SMTP error from remote (?:mail server|mailer) after end of ([A-Za-z]{4})/,
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qr/LMTP error after ([A-Za-z]{4})/,
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qr/LMTP error after end of ([A-Za-z]{4})/,
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];
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my $MessagesOf = {
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# find exim/ -type f -exec grep 'message = US' {} /dev/null \;
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# route.c:1158| DEBUG(D_uid) debug_printf("getpwnam() returned NULL (user not found)\n");
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'userunknown' => ['user not found'],
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# transports/smtp.c:3524| addr->message = US"all host address lookups failed permanently";
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# routers/dnslookup.c:331| addr->message = US"all relevant MX records point to non-existent hosts";
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# route.c:1826| uschar *message = US"Unrouteable address";
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'hostunknown' => [
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'all host address lookups failed permanently',
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'all relevant MX records point to non-existent hosts',
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'Unrouteable address',
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],
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# transports/appendfile.c:2567| addr->user_message = US"mailbox is full";
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# transports/appendfile.c:3049| addr->message = string_sprintf("mailbox is full "
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# transports/appendfile.c:3050| "(quota exceeded while writing to file %s)", filename);
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'mailboxfull' => [
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'mailbox is full',
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'error: quota exceed',
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],
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# routers/dnslookup.c:328| addr->message = US"an MX or SRV record indicated no SMTP service";
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# transports/smtp.c:3502| addr->message = US"no host found for existing SMTP connection";
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'notaccept' => [
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'an MX or SRV record indicated no SMTP service',
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'no host found for existing SMTP connection',
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],
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# parser.c:666| *errorptr = string_sprintf("%s (expected word or \"<\")", *errorptr);
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# parser.c:701| if(bracket_count++ > 5) FAILED(US"angle-brackets nested too deep");
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# parser.c:738| FAILED(US"domain missing in source-routed address");
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# parser.c:747| : string_sprintf("malformed address: %.32s may not follow %.*s",
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'syntaxerror' => [
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'angle-brackets nested too deep',
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'expected word or "<"',
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'domain missing in source-routed address',
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'malformed address:',
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],
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# deliver.c:5614| addr->message = US"delivery to file forbidden";
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# deliver.c:5624| addr->message = US"delivery to pipe forbidden";
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# transports/pipe.c:1156| addr->user_message = US"local delivery failed";
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'systemerror' => [
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'delivery to file forbidden',
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'delivery to pipe forbidden',
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'local delivery failed',
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'LMTP error after ',
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],
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# deliver.c:5425| new->message = US"Too many \"Received\" headers - suspected mail loop";
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'contenterror' => ['Too many "Received" headers'],
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};
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my $DelayedFor = [
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# retry.c:902| addr->message = (addr->message == NULL)? US"retry timeout exceeded" :
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# deliver.c:7475| "No action is required on your part. Delivery attempts will continue for\n"
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# smtp.c:3508| US"retry time not reached for any host after a long failure period" :
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# smtp.c:3508| US"all hosts have been failing for a long time and were last tried "
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# "after this message arrived";
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# deliver.c:7459| print_address_error(addr, f, US"Delay reason: ");
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# deliver.c:7586| "Message %s has been frozen%s.\nThe sender is <%s>.\n", message_id,
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# receive.c:4021| moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
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# receive.c:4022| "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
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'retry timeout exceeded',
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'No action is required on your part',
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'retry time not reached for any host after a long failure period',
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'all hosts have been failing for a long time and were last tried',
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'Delay reason: ',
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'has been frozen',
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'was frozen on arrival by ',
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];
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# X-Failed-Recipients: kijitora@example.ed.jp
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sub headerlist { return ['X-Failed-Recipients'] }
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sub description { 'Exim' }
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sub scan {
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# Detect an error from Exim
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# @param [Hash] mhead Message headers of a bounce email
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# @options mhead [String] from From header
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# @options mhead [String] date Date header
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# @options mhead [String] subject Subject header
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# @options mhead [Array] received Received headers
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# @options mhead [String] others Other required headers
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# @param [String] mbody Message body of a bounce email
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# @return [Hash, Undef] Bounce data list and message/rfc822 part
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# or Undef if it failed to parse or the
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# arguments are missing
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# @since v4.0.0
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my $class = shift;
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my $mhead = shift // return undef;
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my $mbody = shift // return undef;
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#'message-id'=> qr/\A[<]\w+[-]\w+[-]\w+[@].+\z/,
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# Message-Id: <E1P1YNN-0003AD-Ga@example.org>
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return undef if $mhead->{'from'} =~/[@].+[.]mail[.]ru[>]?/;
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return undef unless index($mhead->{'from'}, 'Mail Delivery System') == 0;
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return undef unless $mhead->{'subject'} =~ qr{(?:
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Mail[ ]delivery[ ]failed(:[ ]returning[ ]message[ ]to[ ]sender)?
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|Warning:[ ]message[ ].+[ ]delayed[ ]+
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|Delivery[ ]Status[ ]Notification
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|Mail[ ]failure
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|Message[ ]frozen
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|error[(]s[)][ ]in[ ]forwarding[ ]or[ ]filtering
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)
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}x;
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my $dscontents = [__PACKAGE__->DELIVERYSTATUS];
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my @hasdivided = split("\n", $$mbody);
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my $rfc822part = ''; # (String) message/rfc822-headers part
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my $rfc822list = []; # (Array) Each line in message/rfc822 part string
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my $blanklines = 0; # (Integer) The number of blank lines
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my $readcursor = 0; # (Integer) Points the current cursor position
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my $recipients = 0; # (Integer) The number of 'Final-Recipient' header
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my $localhost0 = ''; # (String) Local MTA
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my $boundary00 = ''; # (String) Boundary string
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my $havepassed = {
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'deliverystatus' => 0
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};
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my $v = undef;
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if( $mhead->{'content-type'} ) {
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# Get the boundary string and set regular expression for matching with
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# the boundary string.
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$boundary00 = Sisimai::MIME->boundary($mhead->{'content-type'});
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}
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for my $e ( @hasdivided ) {
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# Read each line between the start of the message and the start of rfc822 part.
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last if $e eq $StartingOf->{'endof'}->[0];
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unless( $readcursor ) {
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# Beginning of the bounce message or delivery status part
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if( $e =~ $MarkingsOf->{'message'} ) {
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$readcursor |= $Indicators->{'deliverystatus'};
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next unless $e =~ $MarkingsOf->{'frozen'};
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}
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}
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unless( $readcursor & $Indicators->{'message-rfc822'} ) {
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# Beginning of the original message part
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if( $e =~ $MarkingsOf->{'rfc822'} ) {
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$readcursor |= $Indicators->{'message-rfc822'};
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next;
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}
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}
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if( $readcursor & $Indicators->{'message-rfc822'} ) {
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# After "message/rfc822"
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unless( length $e ) {
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$blanklines++;
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last if $blanklines > 1;
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next;
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}
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push @$rfc822list, $e;
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} else {
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# Before "message/rfc822"
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next unless $readcursor & $Indicators->{'deliverystatus'};
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next unless length $e;
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# This message was created automatically by mail delivery software.
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#
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# A message that you sent could not be delivered to one or more of its
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# recipients. This is a permanent error. The following address(es) failed:
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#
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# kijitora@example.jp
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# SMTP error from remote mail server after RCPT TO:<kijitora@example.jp>:
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# host neko.example.jp [192.0.2.222]: 550 5.1.1 <kijitora@example.jp>... User Unknown
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$v = $dscontents->[-1];
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if( $e =~ /\A[ \t]{2}([^ \t]+[@][^ \t]+[.]?[a-zA-Z]+)(:.+)?\z/ ||
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$e =~ /\A[ \t]{2}[^ \t]+[@][^ \t]+[.][a-zA-Z]+[ ]<(.+?[@].+?)>:.+\z/ ||
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$e =~ $MarkingsOf->{'alias'} ) {
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# kijitora@example.jp
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# sabineko@example.jp: forced freeze
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# mikeneko@example.jp <nekochan@example.org>: ...
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#
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# deliver.c:4549| printed = US"an undisclosed address";
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# an undisclosed address
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# (generated from kijitora@example.jp)
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my $r = $1;
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if( $v->{'recipient'} ) {
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# There are multiple recipient addresses in the message body.
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push @$dscontents, __PACKAGE__->DELIVERYSTATUS;
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$v = $dscontents->[-1];
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}
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if( $e =~ /\A[ \t]+[^ \t]+[@][^ \t]+[.][a-zA-Z]+[ ]<(.+?[@].+?)>:.+\z/ ) {
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# parser.c:743| while (bracket_count-- > 0) if (*s++ != '>')
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# parser.c:744| {
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# parser.c:745| *errorptr = s[-1] == 0
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# parser.c:746| ? US"'>' missing at end of address"
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# parser.c:747| : string_sprintf("malformed address: %.32s may not follow %.*s",
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# parser.c:748| s-1, (int)(s - US mailbox - 1), mailbox);
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# parser.c:749| goto PARSE_FAILED;
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# parser.c:750| }
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$r = $1;
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$v->{'diagnosis'} = $e;
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}
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$v->{'recipient'} = $r;
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$recipients++;
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} elsif( $e =~ /\A[ ]+[(]generated[ ]from[ ](.+)[)]\z/ ||
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$e =~ /\A[ ]+generated[ ]by[ ]([^ \t]+[@][^ \t]+)/ ) {
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# (generated from kijitora@example.jp)
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# pipe to |/bin/echo "Some pipe output"
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# generated by userx@myhost.test.ex
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$v->{'alias'} = $1;
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} else {
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next unless length $e;
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if( $e =~ $MarkingsOf->{'frozen'} ) {
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# Message *** has been frozen by the system filter.
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# Message *** was frozen on arrival by ACL.
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$v->{'alterrors'} .= $e.' ';
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} else {
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if( $boundary00 ) {
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# --NNNNNNNNNN-eximdsn-MMMMMMMMMM
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# Content-type: message/delivery-status
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# ...
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if( $e =~ /\AReporting-MTA:[ ]*(?:DNS|dns);[ ]*(.+)\z/ ) {
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# Reporting-MTA: dns; mx.example.jp
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$v->{'lhost'} = $1;
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} elsif( $e =~ /\AAction:[ ]*(.+)\z/ ) {
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# Action: failed
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$v->{'action'} = lc $1;
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} elsif( $e =~ /\AStatus:[ ]*(\d[.]\d+[.]\d+)/ ) {
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# Status: 5.0.0
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$v->{'status'} = $1;
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} elsif( $e =~ /\ADiagnostic-Code:[ ]*(.+?);[ ]*(.+)\z/ ) {
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# Diagnostic-Code: SMTP; 550 5.1.1 <userunknown@example.jp>... User Unknown
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$v->{'spec'} = uc $1;
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$v->{'diagnosis'} = $2;
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} elsif( $e =~ /\AFinal-Recipient:[ ]*(?:RFC|rfc)822;[ ]*(.+)\z/ ) {
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# Final-Recipient: rfc822;|/bin/echo "Some pipe output"
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my $c = $1;
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$v->{'spec'} ||= rindex($c, '@') > -1 ? 'SMTP' : 'X-UNIX';
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} else {
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# Error message ?
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unless( $havepassed->{'deliverystatus'} ) {
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# Content-type: message/delivery-status
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$havepassed->{'deliverystatus'} = 1 if index($e, $StartingOf->{'deliverystatus'}) == 0;
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$v->{'alterrors'} .= $e.' ' if index($e, ' ') == 0;
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}
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}
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} else {
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if( scalar @$dscontents == $recipients ) {
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# Error message
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next unless length $e;
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$v->{'diagnosis'} .= $e.' ';
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} else {
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# Error message when email address above does not include '@'
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# and domain part.
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if( $e =~ m<\A[ ]+pipe[ ]to[ ][|]/.+> ) {
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# pipe to |/path/to/prog ...
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# generated by kijitora@example.com
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$v->{'diagnosis'} = $e;
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} else {
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next unless index($e, ' ') == 0;
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$v->{'alterrors'} .= $e.' ';
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}
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}
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}
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}
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}
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} # End of if: rfc822
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}
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if( $recipients ) {
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# Check "an undisclosed address", "unroutable address"
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for my $q ( @$dscontents ) {
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# Replace the recipient address with the value of "alias"
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next unless $q->{'alias'};
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if( ! $q->{'recipient'} || rindex($q->{'recipient'}, '@') == -1 ) {
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# The value of "recipient" is empty or does not include "@"
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$q->{'recipient'} = $q->{'alias'};
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}
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}
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} else {
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# Fallback for getting recipient addresses
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if( defined $mhead->{'x-failed-recipients'} ) {
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# X-Failed-Recipients: kijitora@example.jp
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my @rcptinhead = split(',', $mhead->{'x-failed-recipients'});
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map { $_ =~ s/\A[ ]+//; $_ =~ s/[ ]+\z// } @rcptinhead;
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$recipients = scalar @rcptinhead;
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while( my $e = shift @rcptinhead ) {
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# Insert each recipient address into @$dscontents
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$dscontents->[-1]->{'recipient'} = $e;
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next if scalar @$dscontents == $recipients;
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push @$dscontents, __PACKAGE__->DELIVERYSTATUS;
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}
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}
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}
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return undef unless $recipients;
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if( scalar @{ $mhead->{'received'} } ) {
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# Get the name of local MTA
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# Received: from marutamachi.example.org (c192128.example.net [192.0.2.128])
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$localhost0 = $1 if $mhead->{'received'}->[-1] =~ /from[ \t]([^ ]+) /;
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}
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for my $e ( @$dscontents ) {
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# Set default values if each value is empty.
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$e->{'agent'} = __PACKAGE__->smtpagent;
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$e->{'lhost'} ||= $localhost0;
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unless( $e->{'diagnosis'} ) {
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# Empty Diagnostic-Code: or error message
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if( $boundary00 ) {
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# --NNNNNNNNNN-eximdsn-MMMMMMMMMM
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# Content-type: message/delivery-status
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#
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# Reporting-MTA: dns; the.local.host.name
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#
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# Action: failed
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# Final-Recipient: rfc822;/a/b/c
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# Status: 5.0.0
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#
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# Action: failed
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# Final-Recipient: rfc822;|/p/q/r
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# Status: 5.0.0
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$e->{'diagnosis'} = $dscontents->[0]->{'diagnosis'} || '';
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$e->{'spec'} ||= $dscontents->[0]->{'spec'};
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if( $dscontents->[0]->{'alterrors'} ) {
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# The value of "alterrors" is also copied
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$e->{'alterrors'} = $dscontents->[0]->{'alterrors'};
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}
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}
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}
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if( exists $e->{'alterrors'} && $e->{'alterrors'} ) {
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# Copy alternative error message
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$e->{'diagnosis'} ||= $e->{'alterrors'};
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if( index($e->{'diagnosis'}, '-') == 0 || substr($e->{'diagnosis'}, -2, 2) eq '__' ) {
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# Override the value of diagnostic code message
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$e->{'diagnosis'} = $e->{'alterrors'} if $e->{'alterrors'};
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} else {
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# Check the both value and try to match
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if( length($e->{'diagnosis'}) < length($e->{'alterrors'}) ) {
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# Check the value of alterrors
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my $rxdiagnosis = qr/\Q$e->{'diagnosis'}\E/i;
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if( $e->{'alterrors'} =~ $rxdiagnosis ) {
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# Override the value of diagnostic code message because
|
|
# the value of alterrors includes the value of diagnosis.
|
|
$e->{'diagnosis'} = $e->{'alterrors'};
|
|
}
|
|
}
|
|
}
|
|
delete $e->{'alterrors'};
|
|
}
|
|
$e->{'diagnosis'} = Sisimai::String->sweep($e->{'diagnosis'});
|
|
$e->{'diagnosis'} =~ s/\b__.+\z//;
|
|
|
|
unless( $e->{'rhost'} ) {
|
|
# Get the remote host name
|
|
# host neko.example.jp [192.0.2.222]: 550 5.1.1 <kijitora@example.jp>... User Unknown
|
|
$e->{'rhost'} = $1 if $e->{'diagnosis'} =~ /host[ \t]+([^ \t]+)[ \t]\[.+\]:[ \t]/;
|
|
|
|
unless( $e->{'rhost'} ) {
|
|
if( scalar @{ $mhead->{'received'} } ) {
|
|
# Get localhost and remote host name from Received header.
|
|
my $r0 = $mhead->{'received'};
|
|
$e->{'rhost'} = pop @{ Sisimai::RFC5322->received($r0->[-1]) };
|
|
}
|
|
}
|
|
}
|
|
|
|
unless( $e->{'command'} ) {
|
|
# Get the SMTP command name for the session
|
|
SMTP: for my $r ( @$ReCommands ) {
|
|
# Verify each regular expression of SMTP commands
|
|
next unless $e->{'diagnosis'} =~ $r;
|
|
$e->{'command'} = uc $1;
|
|
last;
|
|
}
|
|
|
|
# Detect the reason of bounce
|
|
if( $e->{'command'} eq 'HELO' || $e->{'command'} eq 'EHLO' ) {
|
|
# HELO | Connected to 192.0.2.135 but my name was rejected.
|
|
$e->{'reason'} = 'blocked';
|
|
|
|
} elsif( $e->{'command'} eq 'MAIL' ) {
|
|
# MAIL | Connected to 192.0.2.135 but sender was rejected.
|
|
# $e->{'reason'} = 'rejected';
|
|
$e->{'reason'} = 'onhold';
|
|
|
|
} else {
|
|
# Verify each regular expression of session errors
|
|
SESSION: for my $r ( keys %$MessagesOf ) {
|
|
# Check each regular expression
|
|
next unless grep { index($e->{'diagnosis'}, $_) > -1 } @{ $MessagesOf->{ $r } };
|
|
$e->{'reason'} = $r;
|
|
last;
|
|
}
|
|
|
|
unless( $e->{'reason'} ) {
|
|
# The reason "expired"
|
|
$e->{'reason'} = 'expired' if grep { index($e->{'diagnosis'}, $_) > -1 } @$DelayedFor;
|
|
}
|
|
}
|
|
}
|
|
|
|
STATUS: {
|
|
# Prefer the value of smtp reply code in Diagnostic-Code:
|
|
# See set-of-emails/maildir/bsd/exim-20.eml
|
|
# Action: failed
|
|
# Final-Recipient: rfc822;userx@test.ex
|
|
# Status: 5.0.0
|
|
# Remote-MTA: dns; 127.0.0.1
|
|
# Diagnostic-Code: smtp; 450 TEMPERROR: retry timeout exceeded
|
|
# The value of "Status:" indicates permanent error but the value
|
|
# of SMTP reply code in Diagnostic-Code: field is "TEMPERROR"!!!!
|
|
my $sv = Sisimai::SMTP::Status->find($e->{'diagnosis'});
|
|
my $rv = Sisimai::SMTP::Reply->find($e->{'diagnosis'});
|
|
my $s1 = 0; # First character of Status as integer
|
|
my $r1 = 0; # First character of SMTP reply code as integer
|
|
my $v1 = 0;
|
|
|
|
FIND_CODE: while(1) {
|
|
# "Status:" field did not exist in the bounce message
|
|
last if $sv;
|
|
last unless $rv;
|
|
|
|
# Check SMTP reply code
|
|
# Generate pseudo DSN code from SMTP reply code
|
|
$r1 = substr($rv, 0, 1);
|
|
if( $r1 == 4 ) {
|
|
# Get the internal DSN(temporary error)
|
|
$sv = Sisimai::SMTP::Status->code($e->{'reason'}, 1);
|
|
|
|
} elsif( $r1 == 5 ) {
|
|
# Get the internal DSN(permanent error)
|
|
$sv = Sisimai::SMTP::Status->code($e->{'reason'}, 0);
|
|
}
|
|
last;
|
|
}
|
|
|
|
$s1 = substr($sv, 0, 1) if $sv;
|
|
$v1 = $s1 + $r1;
|
|
$v1 += substr($e->{'status'}, 0, 1) if $e->{'status'};
|
|
|
|
if( $v1 > 0 ) {
|
|
# Status or SMTP reply code exists
|
|
# Set pseudo DSN into the value of "status" accessor
|
|
$e->{'status'} = $sv if $r1 > 0;
|
|
|
|
} else {
|
|
# Neither Status nor SMTP reply code exist
|
|
if( $e->{'reason'} eq 'expired' || $e->{'reason'} eq 'mailboxfull' ) {
|
|
# Set pseudo DSN (temporary error)
|
|
$sv = Sisimai::SMTP::Status->code($e->{'reason'}, 1);
|
|
|
|
} else {
|
|
# Set pseudo DSN (permanent error)
|
|
$sv = Sisimai::SMTP::Status->code($e->{'reason'}, 0);
|
|
}
|
|
}
|
|
$e->{'status'} ||= $sv;
|
|
}
|
|
$e->{'command'} ||= '';
|
|
}
|
|
$rfc822part = Sisimai::RFC5322->weedout($rfc822list);
|
|
return { 'ds' => $dscontents, 'rfc822' => $$rfc822part };
|
|
}
|
|
|
|
1;
|
|
__END__
|
|
|
|
=encoding utf-8
|
|
|
|
=head1 NAME
|
|
|
|
Sisimai::Bite::Email::Exim - bounce mail parser class for C<Exim>.
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
use Sisimai::Bite::Email::Exim;
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
Sisimai::Bite::Email::Exim parses a bounce email which created by C<Exim>.
|
|
Methods in the module are called from only Sisimai::Message.
|
|
|
|
=head1 CLASS METHODS
|
|
|
|
=head2 C<B<description()>>
|
|
|
|
C<description()> returns description string of this module.
|
|
|
|
print Sisimai::Bite::Email::Exim->description;
|
|
|
|
=head2 C<B<smtpagent()>>
|
|
|
|
C<smtpagent()> returns MTA name.
|
|
|
|
print Sisimai::Bite::Email::Exim->smtpagent;
|
|
|
|
=head2 C<B<scan(I<header data>, I<reference to body string>)>>
|
|
|
|
C<scan()> method parses a bounced email and return results as a array reference.
|
|
See Sisimai::Message for more details.
|
|
|
|
=head1 AUTHOR
|
|
|
|
azumakuniyuki
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright (C) 2014-2018 azumakuniyuki, All rights reserved.
|
|
|
|
=head1 LICENSE
|
|
|
|
This software is distributed under The BSD 2-Clause License.
|
|
|
|
=cut
|