89 lines
1.6 KiB
C
89 lines
1.6 KiB
C
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <strings.h>
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#include <unistd.h>
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#include <err.h>
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enum{
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ARG_PROG = 0,
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ARG_OP,
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ARG_IFNAME,
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ARG_ADDR,
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ARG_NUM
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};
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static void
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usage(void)
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{
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printf("%s <add|del> <ifname> <IPv4 addr>\n",
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getprogname());
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exit(1);
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}
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int
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main(int argc, char *argv[])
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{
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int fd, rv;
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unsigned long req;
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struct ifreq ifr;
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unsigned int ifidx;
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struct sockaddr_in *sin;
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struct sockaddr_in6 *sin6;
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bzero(&ifr, sizeof(ifr));
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if (argc != ARG_NUM)
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usage();
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if (strcmp(argv[ARG_OP], "add") == 0)
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req = SIOCADDMULTI;
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else if (strcmp(argv[ARG_OP], "del") == 0)
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req = SIOCDELMULTI;
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else
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usage();
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ifidx = if_nametoindex(argv[ARG_IFNAME]);
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if (ifidx == 0)
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err(1, "if_nametoindex(%s)", argv[ARG_IFNAME]);
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strncpy(ifr.ifr_name, argv[ARG_IFNAME], sizeof(ifr.ifr_name));
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sin = (struct sockaddr_in *)&ifr.ifr_addr;
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sin->sin_family = AF_INET;
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sin->sin_len = sizeof(*sin);
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rv = inet_pton(AF_INET, argv[ARG_ADDR], &sin->sin_addr);
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if (rv != 1) {
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sin6 = (struct sockaddr_in6 *)&ifr.ifr_addr;
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sin6->sin6_family = AF_INET6;
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sin6->sin6_len = sizeof(*sin6);
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rv = inet_pton(AF_INET6, argv[ARG_ADDR], &sin6->sin6_addr);
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if (rv != 1)
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errx(1, "inet_pton(%s)", argv[ARG_ADDR]);
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}
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fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (fd < 0)
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err(1, "socket");
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if (ioctl(fd, req, (caddr_t)&ifr) < 0) {
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err(1, "ioctl(%s)",
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(req == SIOCADDMULTI) ? "SIOCADDMULTI" : "SIOCDELMULTI");
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}
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close(fd);
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return 0;
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}
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