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      1 /*	$NetBSD: siocXmulti.c,v 1.3 2021/08/19 03:36:42 yamaguchi Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2021 Internet Initiative Japan Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __RCSID("$NetBSD: siocXmulti.c,v 1.3 2021/08/19 03:36:42 yamaguchi Exp $");
     31 
     32 #include <sys/socket.h>
     33 #include <sys/ioctl.h>
     34 
     35 #include <net/if.h>
     36 #include <netinet/in.h>
     37 #include <arpa/inet.h>
     38 
     39 #include <stdio.h>
     40 #include <stdlib.h>
     41 #include <string.h>
     42 #include <strings.h>
     43 #include <unistd.h>
     44 #include <err.h>
     45 
     46 enum{
     47 	ARG_PROG = 0,
     48 	ARG_OP,
     49 	ARG_IFNAME,
     50 	ARG_ADDR,
     51 	ARG_NUM
     52 };
     53 
     54 static void
     55 usage(void)
     56 {
     57 
     58 	printf("%s <add|del> <ifname> <IPv4 addr>\n",
     59 	    getprogname());
     60 	exit(1);
     61 }
     62 
     63 int
     64 main(int argc, char *argv[])
     65 {
     66 	int			 fd, rv;
     67 	unsigned long		 req;
     68 	struct ifreq		 ifr;
     69 	unsigned int		 ifidx;
     70 	struct sockaddr_in	*sin;
     71 	struct sockaddr_in6	*sin6;
     72 
     73 	bzero(&ifr, sizeof(ifr));
     74 
     75 	if (argc != ARG_NUM)
     76 		usage();
     77 
     78 	if (strcmp(argv[ARG_OP], "add") == 0)
     79 		req = SIOCADDMULTI;
     80 	else if (strcmp(argv[ARG_OP], "del") == 0)
     81 		req = SIOCDELMULTI;
     82 	else
     83 		usage();
     84 
     85 	ifidx = if_nametoindex(argv[ARG_IFNAME]);
     86 	if (ifidx == 0)
     87 		err(1, "if_nametoindex(%s)", argv[ARG_IFNAME]);
     88 
     89 	strncpy(ifr.ifr_name, argv[ARG_IFNAME], sizeof(ifr.ifr_name) - 1);
     90 	ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = '\0';
     91 
     92 	sin = (struct sockaddr_in *)&ifr.ifr_addr;
     93 	sin->sin_family = AF_INET;
     94 	sin->sin_len = sizeof(*sin);
     95 	rv = inet_pton(AF_INET, argv[ARG_ADDR], &sin->sin_addr);
     96 
     97 	if (rv != 1) {
     98 		sin6 = (struct sockaddr_in6 *)&ifr.ifr_addr;
     99 		sin6->sin6_family = AF_INET6;
    100 		sin6->sin6_len = sizeof(*sin6);
    101 		rv = inet_pton(AF_INET6, argv[ARG_ADDR], &sin6->sin6_addr);
    102 
    103 		if (rv != 1)
    104 			errx(1, "inet_pton(%s)", argv[ARG_ADDR]);
    105 	}
    106 
    107 	fd = socket(AF_INET, SOCK_DGRAM, 0);
    108 	if (fd < 0)
    109 		err(1, "socket");
    110 
    111 	if (ioctl(fd, req, (caddr_t)&ifr) < 0) {
    112 		err(1, "ioctl(%s)",
    113 		    (req == SIOCADDMULTI) ? "SIOCADDMULTI" : "SIOCDELMULTI");
    114 	}
    115 
    116 	close(fd);
    117 
    118 	return 0;
    119 }
    120