1 files changed, 63 insertions, 0 deletions
diff --git a/tests/sys/netinet/sendto-IP_MULTICAST_IF.c b/tests/sys/netinet/sendto-IP_MULTICAST_IF.c
new file mode 100644
index 000000000000..d478e4da0b3b
--- /dev/null
+++ b/tests/sys/netinet/sendto-IP_MULTICAST_IF.c
@@ -0,0 +1,63 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2025 Gleb Smirnoff <glebius@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <assert.h>
+#include <err.h>
+
+int
+main(int argc, char *argv[])
+{
+	struct sockaddr_in sin = {
+		.sin_family = AF_INET,
+		.sin_len = sizeof(struct sockaddr_in),
+	};
+	struct in_addr in;
+	int s, rv;
+
+	if (argc < 2)
+		errx(1, "Usage: %s IPv4-address", argv[0]);
+
+	if (inet_pton(AF_INET, argv[1], &in) != 1)
+		err(1, "inet_pton(%s) failed", argv[1]);
+
+	assert((s = socket(PF_INET, SOCK_DGRAM, 0)) > 0);
+	assert(bind(s, (struct sockaddr *)&sin, sizeof(sin)) == 0);
+	assert(setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, &in, sizeof(in))
+	  == 0);
+	/* RFC 6676 */
+	assert(inet_pton(AF_INET, "233.252.0.1", &sin.sin_addr) == 1);
+	sin.sin_port = htons(6676);
+	rv = sendto(s, &sin, sizeof(sin), 0,
+	    (struct sockaddr *)&sin, sizeof(sin));
+	if (rv != sizeof(sin))
+		err(1, "sendto failed");
+
+	return (0);
+}