mtest.c revision 191651 
1/*-
2 * Copyright (c) 2007-2009 Bruce Simpson.
3 * Copyright (c) 2000 Wilbert De Graaf.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31/*
32 * Diagnostic and test utility for multicast sockets.
33 * XXX: This file currently assumes INET support in the base system.
34 * TODO: Support embedded KAME Scope ID in IPv6 group addresses.
35 * TODO: Use IPv4 link-local address when source address selection
36 * is implemented; use MCAST_JOIN_SOURCE for IPv4.
37 */
38
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD: head/usr.sbin/mtest/mtest.c 191651 2009-04-29 09:50:04Z bms $");
41
42#include <sys/types.h>
43#include <sys/param.h>
44#include <sys/errno.h>
45#include <sys/socket.h>
46#include <sys/time.h>
47#include <sys/ioctl.h>
48
49#include <net/if.h>
50#include <net/if_dl.h>
51#include <net/ethernet.h>
52#ifdef INET
53#include <netinet/in.h>
54#include <netinet/in_systm.h>
55#include <netinet/ip.h>
56#include <netinet/ip_var.h>
57#endif
58#ifdef INET6
59#include <netinet/in.h>
60#include <netinet/ip6.h>
61#endif
62
63#include <assert.h>
64#include <stdlib.h>
65#include <stdio.h>
66#include <string.h>
67#include <ctype.h>
68#include <errno.h>
69#include <err.h>
70#include <unistd.h>
71
72#include <arpa/inet.h>
73#include <netdb.h>
74#include <ifaddrs.h>
75
76union sockunion {
77	struct sockaddr_storage	ss;
78	struct sockaddr		sa;
79	struct sockaddr_dl	sdl;
80#ifdef INET
81	struct sockaddr_in	sin;
82#endif
83#ifdef INET6
84	struct sockaddr_in6	sin6;
85#endif
86};
87typedef union sockunion sockunion_t;
88
89union mrequnion {
90#ifdef INET
91	struct ip_mreq	 	 mr;
92	struct ip_mreq_source	 mrs;
93#endif
94#ifdef INET6
95	struct ipv6_mreq	 mr6;
96	struct group_source_req	 gr;
97#endif
98};
99typedef union mrequnion mrequnion_t;
100
101#define	MAX_ADDRS	20
102#define	STR_SIZE	20
103#define	LINE_LENGTH	80
104
105#ifdef INET
106static int	__ifindex_to_primary_ip(const uint32_t, struct in_addr *);
107#endif
108static uint32_t	parse_cmd_args(sockunion_t *, sockunion_t *,
109		    const char *, const char *, const char *);
110static void	process_file(char *, int, int);
111static void	process_cmd(char*, int, int, FILE *);
112static int	su_cmp(const void *, const void *);
113static void	usage(void);
114
115/*
116 * Ordering predicate for qsort().
117 */
118static int
119su_cmp(const void *a, const void *b)
120{
121	const sockunion_t	*sua = (const sockunion_t *)a;
122	const sockunion_t	*sub = (const sockunion_t *)b;
123
124	assert(sua->sa.sa_family == sub->sa.sa_family);
125
126	switch (sua->sa.sa_family) {
127#ifdef INET
128	case AF_INET:
129		return ((int)(sua->sin.sin_addr.s_addr -
130		    sub->sin.sin_addr.s_addr));
131		break;
132#endif
133#ifdef INET6
134	case AF_INET6:
135		return (memcmp(&sua->sin6.sin6_addr, &sub->sin6.sin6_addr,
136		    sizeof(struct in6_addr)));
137		break;
138#endif
139	default:
140		break;
141	}
142
143	assert(sua->sa.sa_len == sub->sa.sa_len);
144	return (memcmp(sua, sub, sua->sa.sa_len));
145}
146
147#ifdef INET
148/*
149 * Internal: Map an interface index to primary IPv4 address.
150 * This is somewhat inefficient. This is a useful enough operation
151 * that it probably belongs in the C library.
152 * Return zero if found, -1 on error, 1 on not found.
153 */
154static int
155__ifindex_to_primary_ip(const uint32_t ifindex, struct in_addr *pina)
156{
157	char		 ifname[IFNAMSIZ];
158	struct ifaddrs	*ifa;
159	struct ifaddrs	*ifaddrs;
160	sockunion_t	*psu;
161	int		 retval;
162
163	assert(ifindex != 0);
164
165	retval = -1;
166	if (if_indextoname(ifindex, ifname) == NULL)
167		return (retval);
168	if (getifaddrs(&ifaddrs) < 0)
169		return (retval);
170
171	/*
172	 * Find the ifaddr entry corresponding to the interface name,
173	 * and return the first matching IPv4 address.
174	 */
175	retval = 1;
176	for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
177		if (strcmp(ifa->ifa_name, ifname) != 0)
178			continue;
179		psu = (sockunion_t *)ifa->ifa_addr;
180		if (psu && psu->sa.sa_family == AF_INET) {
181			retval = 0;
182			memcpy(pina, &psu->sin.sin_addr,
183			    sizeof(struct in_addr));
184			break;
185		}
186	}
187
188	if (retval != 0)
189		errno = EADDRNOTAVAIL;	/* XXX */
190
191	freeifaddrs(ifaddrs);
192	return (retval);
193}
194#endif /* INET */
195
196int
197main(int argc, char **argv)
198{
199	char	 line[LINE_LENGTH];
200	char	*p;
201	int	 i, s, s6;
202
203	s = -1;
204	s6 = -1;
205#ifdef INET
206	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
207	if (s == -1)
208		err(1, "can't open IPv4 socket");
209#endif
210#ifdef INET6
211	s6 = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
212	if (s6 == -1)
213		err(1, "can't open IPv6 socket");
214#endif
215
216	if (argc < 2) {
217		if (isatty(STDIN_FILENO)) {
218			printf("multicast membership test program; "
219			    "enter ? for list of commands\n");
220		}
221		do {
222			if (fgets(line, sizeof(line), stdin) != NULL) {
223				if (line[0] != 'f')
224					process_cmd(line, s, s6, stdin);
225				else {
226					/* Get the filename */
227					for (i = 1; isblank(line[i]); i++);
228					if ((p = (char*)strchr(line, '\n'))
229					    != NULL)
230						*p = '\0';
231					process_file(&line[i], s, s6);
232				}
233			}
234		} while (!feof(stdin));
235	} else {
236		for (i = 1; i < argc; i++) {
237			process_file(argv[i], s, s6);
238		}
239	}
240
241	if (s != -1)
242		close(s);
243	if (s6 != -1)
244		close(s6);
245
246	exit (0);
247}
248
249static void
250process_file(char *fname, int s, int s6)
251{
252	char line[80];
253	FILE *fp;
254	char *lineptr;
255
256	fp = fopen(fname, "r");
257	if (fp == NULL) {
258		warn("fopen");
259		return;
260	}
261
262	/* Skip comments and empty lines. */
263	while (fgets(line, sizeof(line), fp) != NULL) {
264		lineptr = line;
265		while (isblank(*lineptr))
266			lineptr++;
267		if (*lineptr != '#' && *lineptr != '\n')
268			process_cmd(lineptr, s, s6, fp);
269	}
270
271	fclose(fp);
272}
273
274/*
275 * Parse join/leave/allow/block arguments, given:
276 *  str1: group (as AF_INET or AF_INET6 printable)
277 *  str2: ifname
278 *  str3: optional source address (may be NULL).
279 *   This argument must have the same parsed address family as str1.
280 * Return the ifindex of ifname, or 0 if any parse element failed.
281 */
282static uint32_t
283parse_cmd_args(sockunion_t *psu, sockunion_t *psu2,
284    const char *str1, const char *str2, const char *str3)
285{
286	struct addrinfo		 hints;
287	struct addrinfo		*res;
288	uint32_t		 ifindex;
289	int			 af, error;
290
291	assert(psu != NULL);
292	assert(str1 != NULL);
293	assert(str2 != NULL);
294
295	af = AF_UNSPEC;
296
297	ifindex = if_nametoindex(str2);
298	if (ifindex == 0)
299		return (0);
300
301	memset(&hints, 0, sizeof(struct addrinfo));
302	hints.ai_flags = AI_NUMERICHOST;
303	hints.ai_family = PF_UNSPEC;
304	hints.ai_socktype = SOCK_DGRAM;
305
306	memset(psu, 0, sizeof(sockunion_t));
307	psu->sa.sa_family = AF_UNSPEC;
308
309	error = getaddrinfo(str1, "0", &hints, &res);
310	if (error) {
311		warnx("getaddrinfo: %s", gai_strerror(error));
312		return (0);
313	}
314	assert(res != NULL);
315	af = res->ai_family;
316	memcpy(psu, res->ai_addr, res->ai_addrlen);
317	freeaddrinfo(res);
318
319	/* sscanf() may pass the empty string. */
320	if (psu2 != NULL && str3 != NULL && *str3 != '\0') {
321		memset(psu2, 0, sizeof(sockunion_t));
322		psu2->sa.sa_family = AF_UNSPEC;
323
324		/* look for following address family; str3 is *optional*. */
325		hints.ai_family = af;
326		error = getaddrinfo(str3, "0", &hints, &res);
327		if (error) {
328			warnx("getaddrinfo: %s", gai_strerror(error));
329			ifindex = 0;
330		} else {
331			if (af != res->ai_family) {
332				errno = EINVAL; /* XXX */
333				ifindex = 0;
334			}
335			memcpy(psu2, res->ai_addr, res->ai_addrlen);
336			freeaddrinfo(res);
337		}
338	}
339
340	return (ifindex);
341}
342
343static __inline int
344af2sock(const int af, int s, int s6)
345{
346
347#ifdef INET
348	if (af == AF_INET)
349		return (s);
350#endif
351#ifdef INET6
352	if (af == AF_INET6)
353		return (s6);
354#endif
355	return (-1);
356}
357
358static __inline int
359af2socklen(const int af)
360{
361
362#ifdef INET
363	if (af == AF_INET)
364		return (sizeof(struct sockaddr_in));
365#endif
366#ifdef INET6
367	if (af == AF_INET6)
368		return (sizeof(struct sockaddr_in6));
369#endif
370	return (-1);
371}
372
373static void
374process_cmd(char *cmd, int s, int s6 __unused, FILE *fp __unused)
375{
376	char			 str1[STR_SIZE];
377	char			 str2[STR_SIZE];
378	char			 str3[STR_SIZE];
379	mrequnion_t		 mr;
380	sockunion_t		 su, su2;
381	struct ifreq		 ifr;
382	char			*line;
383	char			*toptname;
384	void			*optval;
385	uint32_t		 fmode, ifindex;
386	socklen_t		 optlen;
387	int			 af, error, f, flags, i, level, n, optname;
388
389	af = AF_UNSPEC;
390	su.sa.sa_family = AF_UNSPEC;
391	su2.sa.sa_family = AF_UNSPEC;
392
393	line = cmd;
394	while (isblank(*++line))
395		;	/* Skip whitespace. */
396
397	switch (*cmd) {
398	case '?':
399		usage();
400		break;
401
402	case 'q':
403		close(s);
404		exit(0);
405
406	case 's':
407		if ((sscanf(line, "%d", &n) != 1) || (n < 1)) {
408			printf("-1\n");
409			break;
410		}
411		sleep(n);
412		printf("ok\n");
413		break;
414
415	case 'j':
416	case 'l':
417		str3[0] = '\0';
418		toptname = "";
419		sscanf(line, "%s %s %s", str1, str2, str3);
420		ifindex = parse_cmd_args(&su, &su2, str1, str2, str3);
421		if (ifindex == 0) {
422			printf("-1\n");
423			break;
424		}
425		af = su.sa.sa_family;
426#ifdef INET
427		if (af == AF_INET) {
428			struct in_addr ina;
429
430			error = __ifindex_to_primary_ip(ifindex, &ina);
431			if (error != 0) {
432				warn("primary_ip_lookup %s", str2);
433				printf("-1\n");
434				break;
435			}
436			level = IPPROTO_IP;
437
438			if (su2.sa.sa_family != AF_UNSPEC) {
439				mr.mrs.imr_multiaddr = su.sin.sin_addr;
440				mr.mrs.imr_sourceaddr = su2.sin.sin_addr;
441				mr.mrs.imr_interface = ina;
442				optname = (*cmd == 'j') ?
443				    IP_ADD_SOURCE_MEMBERSHIP :
444				    IP_DROP_SOURCE_MEMBERSHIP;
445				toptname = (*cmd == 'j') ?
446				    "IP_ADD_SOURCE_MEMBERSHIP" :
447				    "IP_DROP_SOURCE_MEMBERSHIP";
448				optval = (void *)&mr.mrs;
449				optlen = sizeof(mr.mrs);
450			} else {
451				mr.mr.imr_multiaddr = su.sin.sin_addr;
452				mr.mr.imr_interface = ina;
453				optname = (*cmd == 'j') ?
454				    IP_ADD_MEMBERSHIP : IP_DROP_MEMBERSHIP;
455				toptname = (*cmd == 'j') ?
456				    "IP_ADD_MEMBERSHIP" : "IP_DROP_MEMBERSHIP";
457				optval = (void *)&mr.mr;
458				optlen = sizeof(mr.mr);
459			}
460			if (setsockopt(s, level, optname, optval,
461			    optlen) == 0) {
462				printf("ok\n");
463				break;
464			} else {
465				warn("setsockopt %s", toptname);
466			}
467		}
468#ifdef INET6
469		else
470#endif /* INET with INET6 */
471#endif /* INET */
472#ifdef INET6
473		if (af == AF_INET6) {
474			level = IPPROTO_IPV6;
475			if (su2.sa.sa_family != AF_UNSPEC) {
476				mr.gr.gsr_interface = ifindex;
477				mr.gr.gsr_group = su.ss;
478				mr.gr.gsr_source = su2.ss;
479				optname = (*cmd == 'j') ?
480				    MCAST_JOIN_SOURCE_GROUP:
481				    MCAST_LEAVE_SOURCE_GROUP;
482				toptname = (*cmd == 'j') ?
483				    "MCAST_JOIN_SOURCE_GROUP":
484				    "MCAST_LEAVE_SOURCE_GROUP";
485				optval = (void *)&mr.gr;
486				optlen = sizeof(mr.gr);
487			} else {
488				mr.mr6.ipv6mr_multiaddr = su.sin6.sin6_addr;
489				mr.mr6.ipv6mr_interface = ifindex;
490				optname = (*cmd == 'j') ?
491				    IPV6_JOIN_GROUP :
492				    IPV6_LEAVE_GROUP;
493				toptname = (*cmd == 'j') ?
494				    "IPV6_JOIN_GROUP" :
495				    "IPV6_LEAVE_GROUP";
496				optval = (void *)&mr.mr6;
497				optlen = sizeof(mr.mr6);
498			}
499			if (setsockopt(s6, level, optname, optval,
500			    optlen) == 0) {
501				printf("ok\n");
502				break;
503			} else {
504				warn("setsockopt %s", toptname);
505			}
506		}
507#endif /* INET6 */
508		/* FALLTHROUGH */
509		printf("-1\n");
510		break;
511
512	/*
513	 * Set the socket to include or exclude filter mode, and
514	 * add some sources to the filterlist, using the full-state API.
515	 */
516	case 'i':
517	case 'e': {
518		sockunion_t	 sources[MAX_ADDRS];
519		struct addrinfo	 hints;
520		struct addrinfo	*res;
521		char		*cp;
522		int		 af1;
523
524		n = 0;
525		fmode = (*cmd == 'i') ? MCAST_INCLUDE : MCAST_EXCLUDE;
526		if ((sscanf(line, "%s %s %d", str1, str2, &n)) != 3) {
527			printf("-1\n");
528			break;
529		}
530
531		ifindex = parse_cmd_args(&su, NULL, str1, str2, NULL);
532		if (ifindex == 0 || n < 0 || n > MAX_ADDRS) {
533			printf("-1\n");
534			break;
535		}
536		af = su.sa.sa_family;
537
538		memset(&hints, 0, sizeof(struct addrinfo));
539		hints.ai_flags = AI_NUMERICHOST;
540		hints.ai_family = af;
541		hints.ai_socktype = SOCK_DGRAM;
542
543		for (i = 0; i < n; i++) {
544			sockunion_t *psu = (sockunion_t *)&sources[i];
545			/*
546			 * Trim trailing whitespace, as getaddrinfo()
547			 * can't cope with it.
548			 */
549			fgets(str1, sizeof(str1), fp);
550			cp = strchr(str1, '\n');
551			if (cp != NULL)
552				*cp = '\0';
553
554			res = NULL;
555			error = getaddrinfo(str1, "0", &hints, &res);
556			if (error)
557				break;
558			assert(res != NULL);
559
560			memset(psu, 0, sizeof(sockunion_t));
561			af1 = res->ai_family;
562			if (af1 == af)
563				memcpy(psu, res->ai_addr, res->ai_addrlen);
564			freeaddrinfo(res);
565			if (af1 != af)
566				break;
567		}
568		if (i < n) {
569			if (error)
570				warnx("getaddrinfo: %s", gai_strerror(error));
571			printf("-1\n");
572			break;
573		}
574		if (setsourcefilter(af2sock(af, s, s6), ifindex,
575		    &su.sa, su.sa.sa_len, fmode, n, &sources[0].ss) != 0)
576			warn("setsourcefilter");
577		else
578			printf("ok\n");
579	} break;
580
581	/*
582	 * Allow or block traffic from a source, using the
583	 * delta based api.
584	 */
585	case 't':
586	case 'b': {
587		str3[0] = '\0';
588		toptname = "";
589		sscanf(line, "%s %s %s", str1, str2, str3);
590		ifindex = parse_cmd_args(&su, &su2, str1, str2, str3);
591		if (ifindex == 0 || su2.sa.sa_family == AF_UNSPEC) {
592			printf("-1\n");
593			break;
594		}
595		af = su.sa.sa_family;
596
597		/* First determine our current filter mode. */
598		n = 0;
599		if (getsourcefilter(af2sock(af, s, s6), ifindex,
600		    &su.sa, su.sa.sa_len, &fmode, &n, NULL) != 0) {
601			warn("getsourcefilter");
602			break;
603		}
604#ifdef INET
605		if (af == AF_INET) {
606			struct in_addr ina;
607
608			error = __ifindex_to_primary_ip(ifindex, &ina);
609			if (error != 0) {
610				warn("primary_ip_lookup %s", str2);
611				printf("-1\n");
612				break;
613			}
614			level = IPPROTO_IP;
615			optval = (void *)&mr.mrs;
616			optlen = sizeof(mr.mrs);
617			mr.mrs.imr_multiaddr = su.sin.sin_addr;
618			mr.mrs.imr_sourceaddr = su2.sin.sin_addr;
619			mr.mrs.imr_interface = ina;
620			if (fmode == MCAST_EXCLUDE) {
621				/* Any-source mode socket membership. */
622				optname = (*cmd == 't') ?
623				    IP_UNBLOCK_SOURCE :
624				    IP_BLOCK_SOURCE;
625				toptname = (*cmd == 't') ?
626				    "IP_UNBLOCK_SOURCE" :
627				    "IP_BLOCK_SOURCE";
628			} else {
629				/* Source-specific mode socket membership. */
630				optname = (*cmd == 't') ?
631				    IP_ADD_SOURCE_MEMBERSHIP :
632				    IP_DROP_SOURCE_MEMBERSHIP;
633				toptname = (*cmd == 't') ?
634				    "IP_ADD_SOURCE_MEMBERSHIP" :
635				    "IP_DROP_SOURCE_MEMBERSHIP";
636			}
637			if (setsockopt(s, level, optname, optval,
638			    optlen) == 0) {
639				printf("ok\n");
640				break;
641			} else {
642				warn("setsockopt %s", toptname);
643			}
644		}
645#ifdef INET6
646		else
647#endif /* INET with INET6 */
648#endif /* INET */
649#ifdef INET6
650		if (af == AF_INET6) {
651			level = IPPROTO_IPV6;
652			mr.gr.gsr_interface = ifindex;
653			mr.gr.gsr_group = su.ss;
654			mr.gr.gsr_source = su2.ss;
655			if (fmode == MCAST_EXCLUDE) {
656				/* Any-source mode socket membership. */
657				optname = (*cmd == 't') ?
658				    MCAST_UNBLOCK_SOURCE :
659				    MCAST_BLOCK_SOURCE;
660				toptname = (*cmd == 't') ?
661				    "MCAST_UNBLOCK_SOURCE" :
662				    "MCAST_BLOCK_SOURCE";
663			} else {
664				/* Source-specific mode socket membership. */
665				optname = (*cmd == 't') ?
666				    MCAST_JOIN_SOURCE_GROUP :
667				    MCAST_LEAVE_SOURCE_GROUP;
668				toptname = (*cmd == 't') ?
669				    "MCAST_JOIN_SOURCE_GROUP":
670				    "MCAST_LEAVE_SOURCE_GROUP";
671			}
672			optval = (void *)&mr.gr;
673			optlen = sizeof(mr.gr);
674			if (setsockopt(s6, level, optname, optval,
675			    optlen) == 0) {
676				printf("ok\n");
677				break;
678			} else {
679				warn("setsockopt %s", toptname);
680			}
681		}
682#endif /* INET6 */
683		/* FALLTHROUGH */
684		printf("-1\n");
685	} break;
686
687	case 'g': {
688		sockunion_t	 sources[MAX_ADDRS];
689		char		 addrbuf[NI_MAXHOST];
690		int		 nreqsrc, nsrc;
691
692		if ((sscanf(line, "%s %s %d", str1, str2, &nreqsrc)) != 3) {
693			printf("-1\n");
694			break;
695		}
696		ifindex = parse_cmd_args(&su, NULL, str1, str2, NULL);
697		if (ifindex == 0 || (n < 0 || n > MAX_ADDRS)) {
698			printf("-1\n");
699			break;
700		}
701
702		af = su.sa.sa_family;
703		nsrc = nreqsrc;
704		if (getsourcefilter(af2sock(af, s, s6), ifindex, &su.sa,
705		    su.sa.sa_len, &fmode, &nsrc, &sources[0].ss) != 0) {
706			warn("getsourcefilter");
707			printf("-1\n");
708			break;
709		}
710		printf("%s\n", (fmode == MCAST_INCLUDE) ? "include" :
711		    "exclude");
712		printf("%d\n", nsrc);
713
714		nsrc = MIN(nreqsrc, nsrc);
715		fprintf(stderr, "hexdump of sources:\n");
716		uint8_t *bp = (uint8_t *)&sources[0];
717		for (i = 0; i < (nsrc * sizeof(sources[0])); i++) {
718			fprintf(stderr, "%02x", bp[i]);
719		}
720		fprintf(stderr, "\nend hexdump\n");
721
722		qsort(sources, nsrc, af2socklen(af), su_cmp);
723		for (i = 0; i < nsrc; i++) {
724			sockunion_t *psu = (sockunion_t *)&sources[i];
725			addrbuf[0] = '\0';
726			error = getnameinfo(&psu->sa, psu->sa.sa_len,
727			    addrbuf, sizeof(addrbuf), NULL, 0,
728			    NI_NUMERICHOST);
729			if (error)
730				warnx("getnameinfo: %s", gai_strerror(error));
731			else
732				printf("%s\n", addrbuf);
733		}
734		printf("ok\n");
735	} break;
736
737	/* link-layer stuff follows. */
738
739	case 'a':
740	case 'd': {
741		struct sockaddr_dl	*dlp;
742		struct ether_addr	*ep;
743
744		memset(&ifr, 0, sizeof(struct ifreq));
745		dlp = (struct sockaddr_dl *)&ifr.ifr_addr;
746		dlp->sdl_len = sizeof(struct sockaddr_dl);
747		dlp->sdl_family = AF_LINK;
748		dlp->sdl_index = 0;
749		dlp->sdl_nlen = 0;
750		dlp->sdl_alen = ETHER_ADDR_LEN;
751		dlp->sdl_slen = 0;
752		if (sscanf(line, "%s %s", str1, str2) != 2) {
753			warnc(EINVAL, "sscanf");
754			break;
755		}
756		ep = ether_aton(str2);
757		if (ep == NULL) {
758			warnc(EINVAL, "ether_aton");
759			break;
760		}
761		strlcpy(ifr.ifr_name, str1, IF_NAMESIZE);
762		memcpy(LLADDR(dlp), ep, ETHER_ADDR_LEN);
763		if (ioctl(s, (*cmd == 'a') ? SIOCADDMULTI : SIOCDELMULTI,
764		    &ifr) == -1) {
765			warn("ioctl SIOCADDMULTI/SIOCDELMULTI");
766			printf("-1\n");
767		} else
768			printf("ok\n");
769		break;
770	}
771
772	case 'm':
773		fprintf(stderr,
774		    "warning: IFF_ALLMULTI cannot be set from userland "
775		    "in FreeBSD; command ignored.\n");
776		printf("-1\n");
777		break;
778
779	case 'p':
780		if (sscanf(line, "%s %u", ifr.ifr_name, &f) != 2) {
781			printf("-1\n");
782			break;
783		}
784		if (ioctl(s, SIOCGIFFLAGS, &ifr) == -1) {
785			warn("ioctl SIOCGIFFLAGS");
786			break;
787		}
788		flags = (ifr.ifr_flags & 0xffff) | (ifr.ifr_flagshigh << 16);
789		if (f == 0) {
790			flags &= ~IFF_PPROMISC;
791		} else {
792			flags |= IFF_PPROMISC;
793		}
794		ifr.ifr_flags = flags & 0xffff;
795		ifr.ifr_flagshigh = flags >> 16;
796		if (ioctl(s, SIOCSIFFLAGS, &ifr) == -1)
797			warn("ioctl SIOCGIFFLAGS");
798		else
799			printf( "changed to 0x%08x\n", flags );
800		break;
801
802	case '\n':
803		break;
804	default:
805		printf("invalid command\n");
806		break;
807	}
808}
809
810static void
811usage(void)
812{
813
814	printf("j mcast-addr ifname [src-addr] - join IP multicast group\n");
815	printf("l mcast-addr ifname [src-addr] - leave IP multicast group\n");
816	printf(
817"i mcast-addr ifname n          - set n include mode src filter\n");
818	printf(
819"e mcast-addr ifname n          - set n exclude mode src filter\n");
820	printf("t mcast-addr ifname src-addr  - allow traffic from src\n");
821	printf("b mcast-addr ifname src-addr  - block traffic from src\n");
822	printf("g mcast-addr ifname n        - get and show n src filters\n");
823	printf("a ifname mac-addr          - add link multicast filter\n");
824	printf("d ifname mac-addr          - delete link multicast filter\n");
825	printf("m ifname 1/0               - set/clear ether allmulti flag\n");
826	printf("p ifname 1/0               - set/clear ether promisc flag\n");
827	printf("f filename                 - read command(s) from file\n");
828	printf("s seconds                  - sleep for some time\n");
829	printf("q                          - quit\n");
830}
831
832