From: Nicki Křížek <nicki@isc.org>
Date: Tue, 2 Dec 2025 16:05:14 +0000 (+0100)
Subject: Remove unused ipv6only feature check
X-Git-Tag: v9.21.17~52^2~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=789e40bd4c2f18432fcc30a279f7138767eb2c9a;p=thirdparty%2Fbind9.git

Remove unused ipv6only feature check

There isn't any system test that uses this feature check.
---

diff --git a/bin/tests/system/feature-test.c b/bin/tests/system/feature-test.c
index 73d0e73e660..75c940ad461 100644
--- a/bin/tests/system/feature-test.c
+++ b/bin/tests/system/feature-test.c
@@ -52,7 +52,6 @@ usage(void) {
 	fprintf(stderr, "\t--have-geoip2\n");
 	fprintf(stderr, "\t--have-json-c\n");
 	fprintf(stderr, "\t--have-libxml2\n");
-	fprintf(stderr, "\t--ipv6only=no\n");
 	fprintf(stderr, "\t--md5\n");
 	fprintf(stderr, "\t--rsasha1\n");
 	fprintf(stderr, "\t--tsan\n");
@@ -207,25 +206,6 @@ main(int argc, char **argv) {
 		return 0;
 	}
 
-	if (strcmp(argv[1], "--ipv6only=no") == 0) {
-#if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY)
-		int s;
-		int n = -1;
-		int v6only = -1;
-		socklen_t len = sizeof(v6only);
-
-		s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
-		if (s >= 0) {
-			n = getsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
-				       (void *)&v6only, &len);
-			close(s);
-		}
-		return (n == 0 && v6only == 0) ? 0 : 1;
-#else  /* defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY) */
-		return 1;
-#endif /* defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY) */
-	}
-
 	if (strcasecmp(argv[1], "--rsasha1") == 0) {
 		if (!dst_algorithm_supported(DST_ALG_RSASHA1)) {
 			return 1;