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
usage(void)55 usage(void)
56 {
57
58 printf("%s <add|del> <ifname> <IPv4 addr>\n",
59 getprogname());
60 exit(1);
61 }
62
63 int
main(int argc,char * argv[])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