OpenSSL::Test: Avoid running IPv6 related tests if IPv6 was explicitly disabled

It's possible to disable IPv6  explicitly when configuring OpenSSL.  In that
case, IPv6 related tests should be skipped.

This is solved by having OpenSSL::Test::Utils::have_IPv6() check configuration
first, before trying to determine if the machine supports IPv6.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Neil Horman <nhorman@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24748)

(cherry picked from commit 5a9c90b1e59b2c368876229862fbff29f2bcf006)

diff --git a/util/perl/OpenSSL/Test/Utils.pm b/util/perl/OpenSSL/Test/Utils.pm
index dcff6a5c996795fc4cee8c8dd504607dfa68fca2..90469cd6fe3dcb9641017617c008705f770839c2 100644 (file)
--- a/util/perl/OpenSSL/Test/Utils.pm
+++ b/util/perl/OpenSSL/Test/Utils.pm
@@ -72,6 +72,8 @@ Returns an item from the %config hash in \$TOP/configdata.pm.
 =item B<have_IPv6>
 
 Return true if IPv4 / IPv6 is possible to use on the current system.
+Additionally, B<have_IPv6> also checks how OpenSSL was configured,
+i.e. if IPv6 was explicitly disabled with -DOPENSSL_USE_IPv6=0.
 
 =back
 
@@ -80,6 +82,7 @@ Return true if IPv4 / IPv6 is possible to use on the current system.
 our %available_protocols;
 our %disabled;
 our %config;
+our %target;
 my $configdata_loaded = 0;
 
 sub load_configdata {
@@ -91,6 +94,7 @@ sub load_configdata {
           %available_protocols = %configdata::available_protocols;
           %disabled = %configdata::disabled;
           %config = %configdata::config;
+          %target = %configdata::target;
     };
     $configdata_loaded = 1;
 }
@@ -221,6 +225,18 @@ sub have_IPv4 {
 }
 
 sub have_IPv6 {
+    if ($have_IPv6 < 0) {
+        load_configdata() unless $configdata_loaded;
+        # If OpenSSL is configured with IPv6 explicitly disabled, no IPv6
+        # related tests should be performed.  In other words, pretend IPv6
+        # isn't present.
+        $have_IPv6 = 0
+            if grep { $_ eq 'OPENSSL_USE_IPV6=0' } @{$config{CPPDEFINES}};
+        # Similarly, if a config target has explicitly disabled IPv6, no
+        # IPv6 related tests should be performed.
+        $have_IPv6 = 0
+            if grep { $_ eq 'OPENSSL_USE_IPV6=0' } @{$target{defines}};
+    }
     if ($have_IPv6 < 0) {
         $have_IPv6 = check_IP("::1");
     }