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Prefer IO::Socket::INET6 over IO::Socket::IP

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While IO::Socket::IP is a core perl module (since Perl v5.19.8, or so
says corelist), IO::Socket::INET6 has been around longer, is said to
be more widely deployed, and most importantly, seems to have less bugs
hitting us.  We therefore prefer IO::Socket::INET6, and only fall back
to IO::Socket::IP if the former doesn't exist on the local system.

Reviewed-by: Viktor Dukhovni <viktor@openssl.org>
This commit is contained in:
Richard Levitte
2016-02-14 07:10:38 +01:00
parent c8d1c9b067
commit 98ac876f2d
1 changed files with 11 additions and 12 deletions
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23
util/TLSProxy/Proxy.pm
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@@ -98,9 +98,14 @@ sub new
message_list => [], message_list => [],
}; };
# IO::Socket::IP is on the core module list, IO::Socket::INET6 isn't.
# However, IO::Socket::INET6 is older and is said to be more widely
# deployed for the moment, and may have less bugs, so we try the latter
# first, then fall back on the code modules. Worst case scenario, we
# fall back to IO::Socket::INET, only supports IPv4.
eval { eval {
require IO::Socket::IP; require IO::Socket::INET6;
my $s = IO::Socket::IP->new( my $s = IO::Socket::INET6->new(
LocalAddr => "::1", LocalAddr => "::1",
LocalPort => 0, LocalPort => 0,
Listen=>1, Listen=>1,
@@ -109,13 +114,12 @@ sub new
$s->close(); $s->close();
}; };
if ($@ eq "") { if ($@ eq "") {
# IO::Socket::IP supports IPv6 and is in the core modules list $IP_factory = sub { IO::Socket::INET6->new(@_); };
$IP_factory = sub { IO::Socket::IP->new(@_); };
$have_IPv6 = 1; $have_IPv6 = 1;
} else { } else {
eval { eval {
require IO::Socket::INET6; require IO::Socket::IP;
my $s = IO::Socket::INET6->new( my $s = IO::Socket::IP->new(
LocalAddr => "::1", LocalAddr => "::1",
LocalPort => 0, LocalPort => 0,
Listen=>1, Listen=>1,
@@ -124,14 +128,9 @@ sub new
$s->close(); $s->close();
}; };
if ($@ eq "") { if ($@ eq "") {
# IO::Socket::INET6 supports IPv6 but isn't on the core modules list $IP_factory = sub { IO::Socket::IP->new(@_); };
# However, it's a bit older and said to be more widely deployed
# at the time of writing this comment.
$IP_factory = sub { IO::Socket::INET6->new(@_); };
$have_IPv6 = 1; $have_IPv6 = 1;
} else { } else {
# IO::Socket::INET doesn't support IPv6 but is a fallback in case
# we have no other.
$IP_factory = sub { IO::Socket::INET->new(@_); }; $IP_factory = sub { IO::Socket::INET->new(@_); };
} }
} }