1 files changed, 97 insertions, 0 deletions
diff --git a/tests/sys/netinet/multicast-send.c b/tests/sys/netinet/multicast-send.c
new file mode 100644
index 000000000000..f10b2b6338dd
--- /dev/null
+++ b/tests/sys/netinet/multicast-send.c
@@ -0,0 +1,97 @@
+/*-
+ * 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 <net/if.h>
+#include <assert.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <err.h>
+
+static in_port_t
+atop(const char *c)
+{
+	unsigned long ul;
+
+	errno = 0;
+	if ((ul = strtol(c, NULL, 10)) < 1 || ul > IPPORT_MAX || errno != 0)
+		err(1, "can't parse %s", c);
+
+	return ((in_port_t)ul);
+}
+
+int
+main(int argc, char *argv[])
+{
+	struct sockaddr_in src = {
+		.sin_family = AF_INET,
+		.sin_len = sizeof(struct sockaddr_in),
+	}, dst = {
+		.sin_family = AF_INET,
+		.sin_len = sizeof(struct sockaddr_in),
+	};
+	struct ip_mreqn mreqn;
+	struct in_addr in;
+	int s;
+	bool index;
+
+	if (argc < 7)
+		errx(1, "Usage: %s src-IPv4 src-port dst-IPv4 dst-port "
+		    "interface payload", argv[0]);
+
+	if (inet_pton(AF_INET, argv[1], &src.sin_addr) != 1)
+		err(1, "inet_pton(%s) failed", argv[1]);
+	src.sin_port = htons(atop(argv[2]));
+	if (inet_pton(AF_INET, argv[3], &dst.sin_addr) != 1)
+		err(1, "inet_pton(%s) failed", argv[3]);
+	dst.sin_port = htons(atop(argv[4]));
+	if (inet_pton(AF_INET, argv[5], &in) == 1)
+		index = false;
+	else if ((mreqn.imr_ifindex = if_nametoindex(argv[5])) > 0)
+		index = true;
+	else
+		err(1, "if_nametoindex(%s) failed", argv[5]);
+
+	assert((s = socket(PF_INET, SOCK_DGRAM, 0)) > 0);
+	assert(bind(s, (struct sockaddr *)&src, sizeof(src)) == 0);
+	if (index)
+		assert(setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, &mreqn,
+		    sizeof(mreqn)) == 0);
+	else
+		assert(setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, &in,
+		    sizeof(in)) == 0);
+	if (sendto(s, argv[6], strlen(argv[6]) + 1, 0, (struct sockaddr *)&dst,
+	    sizeof(dst)) != (ssize_t)strlen(argv[6]) + 1)
+		err(1, "sendto failed");
+
+	return (0);
+}