Show quoted text> I'm upgrading to IPV6 an existing ssl server script which already uses IO::Socket::SSL for
> years.
>
> I installed IO::Socket::INET6 and if i use Domain => AF_UNSPEC, the server only binds the
> ipv6 address. I was expecting IO::Socket::SSL should bind both ipv4 and ipv6 addresses.
> ...
> The same server script without the ssl layer (using only IO::Socket::INET6) can bind both ipv6
> et ipv4 addresses.
I've tried on Ubuntu 11.10 too.
I've used IO::Socket::INET6 2.65 and IO::Socket::SSL 1.66
with the following program
use strict;
use warnings;
use IO::Socket::SSL;
use Socket;
for my $class ( qw(IO::Socket::SSL IO::Socket::INET6)) {
for my $domain (AF_UNSPEC,AF_INET6,AF_INET) {
print "dom=$domain class=$class ---- \n";
my $srv = $class->new(
Listen => 10,
SSL_server => 1,
LocalPort => 1234,
Reuse => 1,
Domain => $domain,
) or die;
system('netstat -nl -A inet | grep 1234');
system('netstat -nl -A inet6 | grep 1234');
}
}
I get
dom=0 class=IO::Socket::SSL ----
tcp6 0 0 :::1234 :::* LISTEN
dom=10 class=IO::Socket::SSL ----
tcp6 0 0 :::1234 :::* LISTEN
dom=2 class=IO::Socket::SSL ----
tcp 0 0 0.0.0.0:1234 0.0.0.0:* LISTEN
dom=0 class=IO::Socket::INET6 ----
tcp6 0 0 :::1234 :::* LISTEN
dom=10 class=IO::Socket::INET6 ----
tcp6 0 0 :::1234 :::* LISTEN
dom=2 class=IO::Socket::INET6 ----
tcp 0 0 0.0.0.0:1234 0.0.0.0:* LISTEN
so IO::Socket::SSL behaves the same as IO::Socket::INET6, e.g. opens
IPv6 sockets for AF_INET6 and AF_UNSPEC and IPv4 sockets for AF_INET,
which matches documentation of IO::Socket::INET6.
Both the SSL and the plain INET6 socket provide access for IPv4 connects
via v4-mapped-on-v6, at least on Linux.
IMHO there is no such thing as a single socket, which listens for IPv6
and IPv4. There is only an IPv6 socket getting IPv4 connection through
the v4-mapped-on-v6 mechanism, which is not supported on all OS (OpenBSD
has no support for security reasons).
So you need to create two sockets, one for IPv4 and one for IPv6.
The use for AF_UNSPEC is only to let getaddrinfo decide if it should
use AF_INET6 or AF_INET, if the host can do both it will pick AF_INET6.
Regards,
Steffen
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