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#-*- perl -*-
#
# Copyright (C) 2001,2002,2003,2004 Ken'ichi Fukamachi
# All rights reserved. This program is free software; you can
# redistribute it and/or modify it under the same terms as Perl itself.
#
# $FML: INET6.pm,v 1.13 2003/12/31 04:08:45 fukachan Exp $
#
package Mail::Delivery::Net::INET6;
use strict;
use vars qw(@ISA @EXPORT @EXPORT_OK);
use Carp;
use Mail::Delivery::Utils;
require Exporter;
@ISA = qw(Exporter);
@EXPORT = qw(is_ipv6_ready is_ipv6_mta_syntax connect6);
# Descriptions: we have Socket6.pm or not ?
# Arguments: OBJ($self) HASH_REF($args)
# Side Effects: none
# Return Value: none
sub _we_can_use_Socket6
{
my ($self, $args) = @_;
eval q{
use Socket;
use Socket6;
};
if ($@ =~ /Can\'t locate Socket6.pm/o) {
$self->{_ipv6_ready} = 'no';
}
else {
Log("IPv6 ready");
$self->{_ipv6_ready} = 'yes';
}
}
# Descriptions: This host supports IPv6 ?
# Arguments: OBJ($self) HASH_REF($args)
# Side Effects: none
# Return Value: 1 or 0
sub is_ipv6_ready
{
my ($self, $args) = @_;
# probe the IPv6 availability for the first time
unless ($self->{_ipv6_ready}) {
_we_can_use_Socket6($self, $args);
};
return ($self->{_ipv6_ready} eq 'yes' ? 1 : 0);
}
# Descriptions: $host is IPv6 syntax ?
# return (host, port) if IPv6 native format
# Arguments: OBJ($self) STR($host)
# Side Effects: none
# Return Value: ARRAY(host, port)
sub is_ipv6_mta_syntax
{
my ($self, $host) = @_;
my ($x_host, $x_port);
# check the mta syntax whether it is ipv6 form or not.
if ($host =~ /\[([\d:]+)\]:(\d+)/) {
($x_host, $x_port) = ($1, $2);
return ($x_host, $x_port);
}
else {
return wantarray ? () : undef;
}
}
# Descriptions: try connect(2) by IPv6.
# Arguments: OBJ($self) HASH_REF($args)
# Side Effects: create IPv6 smtp connection
# Return Value: none
sub connect6
{
my ($self, $args) = @_;
my $mta = $args->{ _mta };
# check the mta syntax is $ipv6_addr:$port or not.
my ($host, $port) = $self->is_ipv6_mta_syntax( $args->{ _mta } );
# if mta is ipv6 raw address syntax,
# try to parse $mta to $host:$port style.
unless ($host) {
if ($mta =~ /(\S+):(\S+)/) {
($host, $port) = ($1, $2);
}
}
# hmm, invalid MTA
unless ($host && $port) {
Log("connect6: cannot find mta=$mta");
$self->{_socket} = undef;
return undef;
}
my $fh = undef;
eval q{
use IO::Handle;
use Socket;
use Socket6;
my ($family, $type, $proto, $saddr, $canonname);
# resolve socket info by getaddrinfo()
my @res = getaddrinfo($host, $port, AF_UNSPEC, SOCK_STREAM);
$family = -1;
# clean up
delete $self->{_socket} if defined $self->{_socket};
ADDR_ENTRY:
while (scalar(@res) >= 5) {
($family, $type, $proto, $saddr, $canonname, @res) = @res;
my ($host, $port) =
getnameinfo($saddr, NI_NUMERICHOST | NI_NUMERICSERV);
# check only IPv6 case here.
next ADDR_ENTRY if $family != AF_INET6;
$fh = new IO::Socket;
socket($fh, $family, $type, $proto) || do {
Log("Error: cannot create IPv6 socket");
$self->error_set("Error: cannot create IPv6 socket");
next ADDR_ENTRY;
};
if (connect($fh, $saddr)) {
Log("(debug6) o.k. connect [$host]:$port");
last ADDR_ENTRY;
}
else {
Log("Error: cannot connect [$host]:$port via IPv6");
$self->error_set("Error: cannot [$host]:$port via IPv6");
}
$family = -1;
}
# check socket is under connected state.
# XXX sub $socket->connected { getpeername($self);}
# XXX IO::Socket of old perl have no such method.
if (($family != -1) && defined($fh)) {
if ($family == AF_INET6) {
$self->{_socket} = $fh;
Log("connected to $host:$port by IPv6");
}
else { # cheap diagnostic
delete $self->{_socket};
Log("connected to $host:$port by ? (AF=$family)");
}
} else {
delete $self->{_socket};
Log("(debug6) fail to connect [$host]:$port by IPv6");
$self->error_set("Error: cannot [$host]:$port via IPv6");
}
};
Log($@) if $@;
}
=head1 NAME
Mail::Delivery::Net::INET6 - establish tcp connection over IPv6
=head1 SYNOPSIS
if ($self->is_ipv6_ready($args)) {
$self->connect6($args);
}
=head1 DESCRIPTION
This module tries to create a socket and establish a tcp connection
over IPv6. It is used within C<Mail::Delivery::SMTP> module.
=head1 METHODS
=item C<is_ipv6_ready()>
It checks whether your environment has Socket6.pm or not?
If Socket6 module exists, we assume your operating system is IPv6 ready!
=item C<connect6()>
try L<connect(2)>.
If it succeeds, returned
$self->{ _socket } has true value.
If not,
$self->{ _socket } is undef.
Avaialble arguments follows:
connect6( { _mta => $mta });
$mta is a hostname or [raw_ipv6_addr]:port form, for example,
[::1]:25.
=head1 SEE ALSO
L<Mail::Delivery::SMTP>,
L<Socket6>,
L<Socket>,
L<IO::Handle>,
L<IO::Socket>,
L<Mail::Delivery::Utils>
=head1 CODING STYLE
See C<http://www.fml.org/software/FNF/> on fml coding style guide.
=head1 AUTHOR
Ken'ichi Fukamachi
=head1 COPYRIGHT
Copyright (C) 2001,2002,2003,2004 Ken'ichi Fukamachi
All rights reserved. This program is free software; you can
redistribute it and/or modify it under the same terms as Perl itself.
=head1 HISTORY
Mail::Delivery::Net::INET6 first appeared in fml8 mailing list driver package.
See C<http://www.fml.org/> for more details.
=cut
1;
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