openssl/test/recipes/70-test_sslextension.t

#!/usr/bin/perl
# Written by Matt Caswell for the OpenSSL project.
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use strict;
use OpenSSL::Test qw/:DEFAULT cmdstr top_file top_dir/;
use TLSProxy::Proxy;

my $test_name = "test_sslextension";
setup($test_name);

plan skip_all => "$test_name can only be performed with OpenSSL configured shared"
    unless (map { s/\R//; s/^SHARED_LIBS=\s*//; $_ }
	    grep { /^SHARED_LIBS=/ }
	    do { local @ARGV = ( top_file("Makefile") ); <> })[0] ne "";

$ENV{OPENSSL_ENGINES} = top_dir("engines");
$ENV{OPENSSL_ia32cap} = '~0x200000200000000';
my $proxy = TLSProxy::Proxy->new(
    \&extension_filter,
    cmdstr(app(["openssl"])),
    top_file("apps", "server.pem")
);

plan tests => 1;

#Test 1: Sending a zero length extension block should pass
$proxy->start();
ok(TLSProxy::Message->success, "Zero extension length test");

sub extension_filter
{
    my $proxy = shift;

    # We're only interested in the initial ClientHello
    if ($proxy->flight != 0) {
        return;
    }

    foreach my $message (@{$proxy->message_list}) {
        if ($message->mt == TLSProxy::Message::MT_CLIENT_HELLO) {
            #Remove all extensions and set the extension len to zero
            $message->extension_data({});
            $message->extensions_len(0);
            #Extensions have been removed so make sure we don't try to use them
            $message->process_extensions();

            $message->repack();
        }
    }
}