1 files changed, 130 insertions, 0 deletions
diff --git a/tests/sys/netinet/multicast-receive.c b/tests/sys/netinet/multicast-receive.c
new file mode 100644
index 000000000000..81d0f10f5cfe
--- /dev/null
+++ b/tests/sys/netinet/multicast-receive.c
@@ -0,0 +1,130 @@
+/*-
+ * 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 <netinet/ip.h>
+#include <arpa/inet.h>
+#include <net/if.h>
+#include <assert.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.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[])
+{
+	char buf[IP_MAXPACKET + 1];
+	struct sockaddr_in sin = {
+		.sin_family = AF_INET,
+		.sin_len = sizeof(struct sockaddr_in),
+	};
+	socklen_t slen = sizeof(struct sockaddr_in);
+	struct in_addr maddr, ifaddr;
+	ssize_t len;
+	int s, ifindex;
+	bool index;
+
+	if (argc < 4)
+usage:
+		errx(1, "Usage: %s (ip_mreq|ip_mreqn|group_req) "
+		    "IPv4-group port interface", argv[0]);
+
+	if (inet_pton(AF_INET, argv[2], &maddr) != 1)
+		err(1, "inet_pton(%s) failed", argv[2]);
+	sin.sin_port = htons(atop(argv[3]));
+	if (inet_pton(AF_INET, argv[4], &ifaddr) == 1)
+		index = false;
+	else if ((ifindex = if_nametoindex(argv[4])) > 0)
+		index = true;
+	else if (strcmp(argv[4], "0") == 0) {
+		ifindex = 0;
+		index = true;
+	} else
+		err(1, "if_nametoindex(%s) failed", argv[4]);
+
+	assert((s = socket(PF_INET, SOCK_DGRAM, 0)) > 0);
+	assert(bind(s, (struct sockaddr *)&sin, sizeof(sin)) == 0);
+
+	if (strcmp(argv[1], "ip_mreq") == 0) {
+		if (index)
+			errx(1, "ip_mreq doesn't accept index");
+		struct ip_mreq mreq = {
+			.imr_multiaddr = maddr,
+			.imr_interface = ifaddr,
+		};
+		assert(setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq,
+		    sizeof(mreq)) == 0);
+	} else if (strcmp(argv[1], "ip_mreqn") == 0) {
+		/*
+		 * ip_mreqn shall be used with index, but for testing
+		 * purposes accept address too.
+		 */
+		struct ip_mreqn mreqn = {
+			.imr_multiaddr = maddr,
+			.imr_address = index ? (struct in_addr){ 0 } : ifaddr,
+			.imr_ifindex = index ? ifindex : 0,
+		};
+		assert(setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreqn,
+		    sizeof(mreqn)) == 0);
+	} else if (strcmp(argv[1], "group_req") == 0) {
+		if (!index)
+			errx(1, "group_req expects index");
+		struct group_req greq = { .gr_interface = ifindex };
+		struct sockaddr_in *gsa = (struct sockaddr_in *)&greq.gr_group;
+
+		gsa->sin_family = AF_INET;
+		gsa->sin_len = sizeof(struct sockaddr_in);
+		gsa->sin_addr = maddr;
+		assert(setsockopt(s, IPPROTO_IP, MCAST_JOIN_GROUP, &greq,
+		    sizeof(greq)) == 0);
+	} else
+		goto usage;
+
+	assert((len = recvfrom(s, buf, sizeof(buf) - 1, 0,
+	    (struct sockaddr *)&sin, &slen)) > 0);
+	buf[len] = '\0';
+	printf("%s:%u %s\n", inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), buf);
+
+	return (0);
+}