/*-
* Copyright (c) 2007-2009 Bruce Simpson.
* Copyright (c) 2000 Wilbert De Graaf.
* All rights reserved.
*
* 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
* 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.
*/
/*
* Diagnostic and test utility for multicast sockets.
* XXX: This file currently assumes INET support in the base system.
* TODO: Support embedded KAME Scope ID in IPv6 group addresses.
* TODO: Use IPv4 link-local address when source address selection
* is implemented; use MCAST_JOIN_SOURCE for IPv4.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/ethernet.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#endif
#ifdef INET6
#include <netinet/in.h>
#include <netinet/ip6.h>
#endif
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <err.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <ifaddrs.h>
union sockunion {
struct sockaddr_storage ss;
struct sockaddr sa;
struct sockaddr_dl sdl;
#ifdef INET
struct sockaddr_in sin;
#endif
#ifdef INET6
struct sockaddr_in6 sin6;
#endif
};
typedef union sockunion sockunion_t;
union mrequnion {
#ifdef INET
struct ip_mreq mr;
struct ip_mreq_source mrs;
#endif
#ifdef INET6
struct ipv6_mreq mr6;
struct group_source_req gr;
#endif
};
typedef union mrequnion mrequnion_t;
#define MAX_ADDRS 20
#define STR_SIZE 20
#define LINE_LENGTH 80
#ifdef INET
static int __ifindex_to_primary_ip(const uint32_t, struct in_addr *);
#endif
static uint32_t parse_cmd_args(sockunion_t *, sockunion_t *,
const char *, const char *, const char *);
static void process_file(char *, int, int);
static void process_cmd(char*, int, int, FILE *);
static int su_cmp(const void *, const void *);
static void usage(void);
/*
* Ordering predicate for qsort().
*/
static int
su_cmp(const void *a, const void *b)
{
const sockunion_t *sua = (const sockunion_t *)a;
const sockunion_t *sub = (const sockunion_t *)b;
assert(sua->sa.sa_family == sub->sa.sa_family);
switch (sua->sa.sa_family) {
#ifdef INET
case AF_INET:
return ((int)(sua->sin.sin_addr.s_addr -
sub->sin.sin_addr.s_addr));
break;
#endif
#ifdef INET6
case AF_INET6:
return (memcmp(&sua->sin6.sin6_addr, &sub->sin6.sin6_addr,
sizeof(struct in6_addr)));
break;
#endif
default:
break;
}
assert(sua->sa.sa_len == sub->sa.sa_len);
return (memcmp(sua, sub, sua->sa.sa_len));
}
#ifdef INET
/*
* Internal: Map an interface index to primary IPv4 address.
* This is somewhat inefficient. This is a useful enough operation
* that it probably belongs in the C library.
* Return zero if found, -1 on error, 1 on not found.
*/
static int
__ifindex_to_primary_ip(const uint32_t ifindex, struct in_addr *pina)
{
char ifname[IFNAMSIZ];
struct ifaddrs *ifa;
struct ifaddrs *ifaddrs;
sockunion_t *psu;
int retval;
assert(ifindex != 0);
retval = -1;
if (if_indextoname(ifindex, ifname) == NULL)
return (retval);
if (getifaddrs(&ifaddrs) < 0)
return (retval);
/*
* Find the ifaddr entry corresponding to the interface name,
* and return the first matching IPv4 address.
*/
retval = 1;
for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
if (strcmp(ifa->ifa_name, ifname) != 0)
continue;
psu = (sockunion_t *)ifa->ifa_addr;
if (psu && psu->sa.sa_family == AF_INET) {
retval = 0;
memcpy(pina, &psu->sin.sin_addr,
sizeof(struct in_addr));
break;
}
}
if (retval != 0)
errno = EADDRNOTAVAIL; /* XXX */
freeifaddrs(ifaddrs);
return (retval);
}
#endif /* INET */
int
main(int argc, char **argv)
{
char line[LINE_LENGTH];
char *p;
int i, s, s6;
s = -1;
s6 = -1;
#ifdef INET
s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (s == -1 && errno != EAFNOSUPPORT)
err(1, "can't open IPv4 socket");
#endif
#ifdef INET6
s6 = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
if (s6 == -1 && errno != EAFNOSUPPORT)
err(1, "can't open IPv6 socket");
#endif
if (s == -1 && s6 == -1)
errc(1, EPROTONOSUPPORT, "can't open socket");
if (argc < 2) {
if (isatty(STDIN_FILENO)) {
printf("multicast membership test program; "
"enter ? for list of commands\n");
}
do {
if (fgets(line, sizeof(line), stdin) != NULL) {
if (line[0] != 'f')
process_cmd(line, s, s6, stdin);
else {
/* Get the filename */
for (i = 1; isblank(line[i]); i++);
if ((p = (char*)strchr(line, '\n'))
!= NULL)
*p = '\0';
process_file(&line[i], s, s6);
}
}
} while (!feof(stdin));
} else {
for (i = 1; i < argc; i++) {
process_file(argv[i], s, s6);
}
}
if (s != -1)
close(s);
if (s6 != -1)
close(s6);
exit (0);
}
static void
process_file(char *fname, int s, int s6)
{
char line[80];
FILE *fp;
char *lineptr;
fp = fopen(fname, "r");
if (fp == NULL) {
warn("fopen");
return;
}
/* Skip comments and empty lines. */
while (fgets(line, sizeof(line), fp) != NULL) {
lineptr = line;
while (isblank(*lineptr))
lineptr++;
if (*lineptr != '#' && *lineptr != '\n')
process_cmd(lineptr, s, s6, fp);
}
fclose(fp);
}
/*
* Parse join/leave/allow/block arguments, given:
* str1: group (as AF_INET or AF_INET6 printable)
* str2: ifname
* str3: optional source address (may be NULL).
* This argument must have the same parsed address family as str1.
* Return the ifindex of ifname, or 0 if any parse element failed.
*/
static uint32_t
parse_cmd_args(sockunion_t *psu, sockunion_t *psu2,
const char *str1, const char *str2, const char *str3)
{
struct addrinfo hints;
struct addrinfo *res;
uint32_t ifindex;
int af, error;
assert(psu != NULL);
assert(str1 != NULL);
assert(str2 != NULL);
af = AF_UNSPEC;
ifindex = if_nametoindex(str2);
if (ifindex == 0)
return (0);
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_flags = AI_NUMERICHOST;
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
memset(psu, 0, sizeof(sockunion_t));
psu->sa.sa_family = AF_UNSPEC;
error = getaddrinfo(str1, "0", &hints, &res);
if (error) {
warnx("getaddrinfo: %s", gai_strerror(error));
return (0);
}
assert(res != NULL);
af = res->ai_family;
memcpy(psu, res->ai_addr, res->ai_addrlen);
freeaddrinfo(res);
/* sscanf() may pass the empty string. */
if (psu2 != NULL && str3 != NULL && *str3 != '\0') {
memset(psu2, 0, sizeof(sockunion_t));
psu2->sa.sa_family = AF_UNSPEC;
/* look for following address family; str3 is *optional*. */
hints.ai_family = af;
error = getaddrinfo(str3, "0", &hints, &res);
if (error) {
warnx("getaddrinfo: %s", gai_strerror(error));
ifindex = 0;
} else {
if (af != res->ai_family) {
errno = EINVAL; /* XXX */
ifindex = 0;
}
memcpy(psu2, res->ai_addr, res->ai_addrlen);
freeaddrinfo(res);
}
}
return (ifindex);
}
static __inline int
af2sock(const int af, int s, int s6)
{
#ifdef INET
if (af == AF_INET)
return (s);
#endif
#ifdef INET6
if (af == AF_INET6)
return (s6);
#endif
return (-1);
}
static __inline int
af2socklen(const int af)
{
#ifdef INET
if (af == AF_INET)
return (sizeof(struct sockaddr_in));
#endif
#ifdef INET6
if (af == AF_INET6)
return (sizeof(struct sockaddr_in6));
#endif
return (-1);
}
static void
process_cmd(char *cmd, int s, int s6, FILE *fp __unused)
{
char str1[STR_SIZE];
char str2[STR_SIZE];
char str3[STR_SIZE];
mrequnion_t mr;
sockunion_t su, su2;
struct ifreq ifr;
char *line;
char *toptname;
void *optval;
uint32_t fmode, ifindex;
socklen_t optlen;
int af, error, f, flags, i, level, n, optname;
af = AF_UNSPEC;
su.sa.sa_family = AF_UNSPEC;
su2.sa.sa_family = AF_UNSPEC;
line = cmd;
while (isblank(*++line))
; /* Skip whitespace. */
switch (*cmd) {
case '?':
usage();
break;
case 'q':
close(s);
exit(0);
case 's':
if ((sscanf(line, "%d", &n) != 1) || (n < 1)) {
printf("-1\n");
break;
}
sleep(n);
printf("ok\n");
break;
case 'j':
case 'l':
str3[0] = '\0';
toptname = "";
sscanf(line, "%s %s %s", str1, str2, str3);
ifindex = parse_cmd_args(&su, &su2, str1, str2, str3);
if (ifindex == 0) {
printf("-1\n");
break;
}
af = su.sa.sa_family;
#ifdef INET
if (af == AF_INET) {
struct in_addr ina;
error = __ifindex_to_primary_ip(ifindex, &ina);
if (error != 0) {
warn("primary_ip_lookup %s", str2);
printf("-1\n");
break;
}
level = IPPROTO_IP;
if (su2.sa.sa_family != AF_UNSPEC) {
mr.mrs.imr_multiaddr = su.sin.sin_addr;
mr.mrs.imr_sourceaddr = su2.sin.sin_addr;
mr.mrs.imr_interface = ina;
optname = (*cmd == 'j') ?
IP_ADD_SOURCE_MEMBERSHIP :
IP_DROP_SOURCE_MEMBERSHIP;
toptname = (*cmd == 'j') ?
"IP_ADD_SOURCE_MEMBERSHIP" :
"IP_DROP_SOURCE_MEMBERSHIP";
optval = (void *)&mr.mrs;
optlen = sizeof(mr.mrs);
} else {
mr.mr.imr_multiaddr = su.sin.sin_addr;
mr.mr.imr_interface = ina;
optname = (*cmd == 'j') ?
IP_ADD_MEMBERSHIP : IP_DROP_MEMBERSHIP;
toptname = (*cmd == 'j') ?
"IP_ADD_MEMBERSHIP" : "IP_DROP_MEMBERSHIP";
optval = (void *)&mr.mr;
optlen = sizeof(mr.mr);
}
if (s < 0) {
warnc(EPROTONOSUPPORT, "setsockopt %s",
toptname);
} else if (setsockopt(s, level, optname, optval,
optlen) == 0) {
printf("ok\n");
break;
} else {
warn("setsockopt %s", toptname);
}
}
#ifdef INET6
else
#endif /* INET with INET6 */
#endif /* INET */
#ifdef INET6
if (af == AF_INET6) {
level = IPPROTO_IPV6;
if (su2.sa.sa_family != AF_UNSPEC) {
mr.gr.gsr_interface = ifindex;
mr.gr.gsr_group = su.ss;
mr.gr.gsr_source = su2.ss;
optname = (*cmd == 'j') ?
MCAST_JOIN_SOURCE_GROUP:
MCAST_LEAVE_SOURCE_GROUP;
toptname = (*cmd == 'j') ?
"MCAST_JOIN_SOURCE_GROUP":
"MCAST_LEAVE_SOURCE_GROUP";
optval = (void *)&mr.gr;
optlen = sizeof(mr.gr);
} else {
mr.mr6.ipv6mr_multiaddr = su.sin6.sin6_addr;
mr.mr6.ipv6mr_interface = ifindex;
optname = (*cmd == 'j') ?
IPV6_JOIN_GROUP :
IPV6_LEAVE_GROUP;
toptname = (*cmd == 'j') ?
"IPV6_JOIN_GROUP" :
"IPV6_LEAVE_GROUP";
optval = (void *)&mr.mr6;
optlen = sizeof(mr.mr6);
}
if (s6 < 0) {
warnc(EPROTONOSUPPORT, "setsockopt %s",
toptname);
} else if (setsockopt(s6, level, optname, optval,
optlen) == 0) {
printf("ok\n");
break;
} else {
warn("setsockopt %s", toptname);
}
}
#endif /* INET6 */
/* FALLTHROUGH */
printf("-1\n");
break;
/*
* Set the socket to include or exclude filter mode, and
* add some sources to the filterlist, using the full-state API.
*/
case 'i':
case 'e': {
sockunion_t sources[MAX_ADDRS];
struct addrinfo hints;
struct addrinfo *res;
char *cp;
int af1;
n = 0;
fmode = (*cmd == 'i') ? MCAST_INCLUDE : MCAST_EXCLUDE;
if ((sscanf(line, "%s %s %d", str1, str2, &n)) != 3) {
printf("-1\n");
break;
}
ifindex = parse_cmd_args(&su, NULL, str1, str2, NULL);
if (ifindex == 0 || n < 0 || n > MAX_ADDRS) {
printf("-1\n");
break;
}
af = su.sa.sa_family;
if (af2sock(af, s, s6) == -1) {
warnc(EPROTONOSUPPORT, "setsourcefilter");
break;
}
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_flags = AI_NUMERICHOST;
hints.ai_family = af;
hints.ai_socktype = SOCK_DGRAM;
for (i = 0; i < n; i++) {
sockunion_t *psu = (sockunion_t *)&sources[i];
/*
* Trim trailing whitespace, as getaddrinfo()
* can't cope with it.
*/
fgets(str1, sizeof(str1), fp);
cp = strchr(str1, '\n');
if (cp != NULL)
*cp = '\0';
res = NULL;
error = getaddrinfo(str1, "0", &hints, &res);
if (error)
break;
assert(res != NULL);
memset(psu, 0, sizeof(sockunion_t));
af1 = res->ai_family;
if (af1 == af)
memcpy(psu, res->ai_addr, res->ai_addrlen);
freeaddrinfo(res);
if (af1 != af)
break;
}
if (i < n) {
if (error)
warnx("getaddrinfo: %s", gai_strerror(error));
printf("-1\n");
break;
}
if (setsourcefilter(af2sock(af, s, s6), ifindex,
&su.sa, su.sa.sa_len, fmode, n, &sources[0].ss) != 0)
warn("setsourcefilter");
else
printf("ok\n");
} break;
/*
* Allow or block traffic from a source, using the
* delta based api.
*/
case 't':
case 'b': {
str3[0] = '\0';
toptname = "";
sscanf(line, "%s %s %s", str1, str2, str3);
ifindex = parse_cmd_args(&su, &su2, str1, str2, str3);
if (ifindex == 0 || su2.sa.sa_family == AF_UNSPEC) {
printf("-1\n");
break;
}
af = su.sa.sa_family;
if (af2sock(af, s, s6) == -1) {
warnc(EPROTONOSUPPORT, "getsourcefilter");
break;
}
/* First determine our current filter mode. */
n = 0;
if (getsourcefilter(af2sock(af, s, s6), ifindex,
&su.sa, su.sa.sa_len, &fmode, &n, NULL) != 0) {
warn("getsourcefilter");
break;
}
#ifdef INET
if (af == AF_INET) {
struct in_addr ina;
error = __ifindex_to_primary_ip(ifindex, &ina);
if (error != 0) {
warn("primary_ip_lookup %s", str2);
printf("-1\n");
break;
}
level = IPPROTO_IP;
optval = (void *)&mr.mrs;
optlen = sizeof(mr.mrs);
mr.mrs.imr_multiaddr = su.sin.sin_addr;
mr.mrs.imr_sourceaddr = su2.sin.sin_addr;
mr.mrs.imr_interface = ina;
if (fmode == MCAST_EXCLUDE) {
/* Any-source mode socket membership. */
optname = (*cmd == 't') ?
IP_UNBLOCK_SOURCE :
IP_BLOCK_SOURCE;
toptname = (*cmd == 't') ?
"IP_UNBLOCK_SOURCE" :
"IP_BLOCK_SOURCE";
} else {
/* Source-specific mode socket membership. */
optname = (*cmd == 't') ?
IP_ADD_SOURCE_MEMBERSHIP :
IP_DROP_SOURCE_MEMBERSHIP;
toptname = (*cmd == 't') ?
"IP_ADD_SOURCE_MEMBERSHIP" :
"IP_DROP_SOURCE_MEMBERSHIP";
}
if (setsockopt(s, level, optname, optval,
optlen) == 0) {
printf("ok\n");
break;
} else {
warn("setsockopt %s", toptname);
}
}
#ifdef INET6
else
#endif /* INET with INET6 */
#endif /* INET */
#ifdef INET6
if (af == AF_INET6) {
level = IPPROTO_IPV6;
mr.gr.gsr_interface = ifindex;
mr.gr.gsr_group = su.ss;
mr.gr.gsr_source = su2.ss;
if (fmode == MCAST_EXCLUDE) {
/* Any-source mode socket membership. */
optname = (*cmd == 't') ?
MCAST_UNBLOCK_SOURCE :
MCAST_BLOCK_SOURCE;
toptname = (*cmd == 't') ?
"MCAST_UNBLOCK_SOURCE" :
"MCAST_BLOCK_SOURCE";
} else {
/* Source-specific mode socket membership. */
optname = (*cmd == 't') ?
MCAST_JOIN_SOURCE_GROUP :
MCAST_LEAVE_SOURCE_GROUP;
toptname = (*cmd == 't') ?
"MCAST_JOIN_SOURCE_GROUP":
"MCAST_LEAVE_SOURCE_GROUP";
}
optval = (void *)&mr.gr;
optlen = sizeof(mr.gr);
if (setsockopt(s6, level, optname, optval,
optlen) == 0) {
printf("ok\n");
break;
} else {
warn("setsockopt %s", toptname);
}
}
#endif /* INET6 */
/* FALLTHROUGH */
printf("-1\n");
} break;
case 'g': {
sockunion_t sources[MAX_ADDRS];
char addrbuf[NI_MAXHOST];
int nreqsrc, nsrc;
if ((sscanf(line, "%s %s %d", str1, str2, &nreqsrc)) != 3) {
printf("-1\n");
break;
}
ifindex = parse_cmd_args(&su, NULL, str1, str2, NULL);
if (ifindex == 0 || (n < 0 || n > MAX_ADDRS)) {
printf("-1\n");
break;
}
af = su.sa.sa_family;
if (af2sock(af, s, s6) == -1) {
warnc(EPROTONOSUPPORT, "getsourcefilter");
break;
}
nsrc = nreqsrc;
if (getsourcefilter(af2sock(af, s, s6), ifindex, &su.sa,
su.sa.sa_len, &fmode, &nsrc, &sources[0].ss) != 0) {
warn("getsourcefilter");
printf("-1\n");
break;
}
printf("%s\n", (fmode == MCAST_INCLUDE) ? "include" :
"exclude");
printf("%d\n", nsrc);
nsrc = MIN(nreqsrc, nsrc);
fprintf(stderr, "hexdump of sources:\n");
uint8_t *bp = (uint8_t *)&sources[0];
for (i = 0; i < (nsrc * sizeof(sources[0])); i++) {
fprintf(stderr, "%02x", bp[i]);
}
fprintf(stderr, "\nend hexdump\n");
qsort(sources, nsrc, af2socklen(af), su_cmp);
for (i = 0; i < nsrc; i++) {
sockunion_t *psu = (sockunion_t *)&sources[i];
addrbuf[0] = '\0';
error = getnameinfo(&psu->sa, psu->sa.sa_len,
addrbuf, sizeof(addrbuf), NULL, 0,
NI_NUMERICHOST);
if (error)
warnx("getnameinfo: %s", gai_strerror(error));
else
printf("%s\n", addrbuf);
}
printf("ok\n");
} break;
/* link-layer stuff follows. */
case 'a':
case 'd': {
struct sockaddr_dl *dlp;
struct ether_addr *ep;
memset(&ifr, 0, sizeof(struct ifreq));
dlp = (struct sockaddr_dl *)&ifr.ifr_addr;
dlp->sdl_len = sizeof(struct sockaddr_dl);
dlp->sdl_family = AF_LINK;
dlp->sdl_index = 0;
dlp->sdl_nlen = 0;
dlp->sdl_alen = ETHER_ADDR_LEN;
dlp->sdl_slen = 0;
if (sscanf(line, "%s %s", str1, str2) != 2) {
warnc(EINVAL, "sscanf");
break;
}
ep = ether_aton(str2);
if (ep == NULL) {
warnc(EINVAL, "ether_aton");
break;
}
strlcpy(ifr.ifr_name, str1, IF_NAMESIZE);
memcpy(LLADDR(dlp), ep, ETHER_ADDR_LEN);
if (ioctl(s, (*cmd == 'a') ? SIOCADDMULTI : SIOCDELMULTI,
&ifr) == -1) {
warn("ioctl SIOCADDMULTI/SIOCDELMULTI");
printf("-1\n");
} else
printf("ok\n");
break;
}
case 'm':
fprintf(stderr,
"warning: IFF_ALLMULTI cannot be set from userland "
"in FreeBSD; command ignored.\n");
printf("-1\n");
break;
case 'p':
if (sscanf(line, "%s %u", ifr.ifr_name, &f) != 2) {
printf("-1\n");
break;
}
if (ioctl(s, SIOCGIFFLAGS, &ifr) == -1) {
warn("ioctl SIOCGIFFLAGS");
break;
}
flags = (ifr.ifr_flags & 0xffff) | (ifr.ifr_flagshigh << 16);
if (f == 0) {
flags &= ~IFF_PPROMISC;
} else {
flags |= IFF_PPROMISC;
}
ifr.ifr_flags = flags & 0xffff;
ifr.ifr_flagshigh = flags >> 16;
if (ioctl(s, SIOCSIFFLAGS, &ifr) == -1)
warn("ioctl SIOCGIFFLAGS");
else
printf( "changed to 0x%08x\n", flags );
break;
case '\n':
break;
default:
printf("invalid command\n");
break;
}
}
static void
usage(void)
{
printf("j mcast-addr ifname [src-addr] - join IP multicast group\n");
printf("l mcast-addr ifname [src-addr] - leave IP multicast group\n");
printf(
"i mcast-addr ifname n - set n include mode src filter\n");
printf(
"e mcast-addr ifname n - set n exclude mode src filter\n");
printf("t mcast-addr ifname src-addr - allow traffic from src\n");
printf("b mcast-addr ifname src-addr - block traffic from src\n");
printf("g mcast-addr ifname n - get and show n src filters\n");
printf("a ifname mac-addr - add link multicast filter\n");
printf("d ifname mac-addr - delete link multicast filter\n");
printf("m ifname 1/0 - set/clear ether allmulti flag\n");
printf("p ifname 1/0 - set/clear ether promisc flag\n");
printf("f filename - read command(s) from file\n");
printf("s seconds - sleep for some time\n");
printf("q - quit\n");
}
