main.c revision 148744 
1/*
2 * Copyright (c) 1983, 1988, 1993
3 *	Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35char const copyright[] =
36"@(#) Copyright (c) 1983, 1988, 1993\n\
37	Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#if 0
41#ifndef lint
42static char sccsid[] = "@(#)main.c	8.4 (Berkeley) 3/1/94";
43#endif /* not lint */
44#endif
45
46#include <sys/cdefs.h>
47__FBSDID("$FreeBSD: head/usr.bin/netstat/main.c 148744 2005-08-05 18:45:49Z phk $");
48
49#include <sys/param.h>
50#include <sys/file.h>
51#include <sys/protosw.h>
52#include <sys/socket.h>
53
54#include <netinet/in.h>
55
56#include <netgraph/ng_socket.h>
57
58#include <ctype.h>
59#include <err.h>
60#include <errno.h>
61#include <kvm.h>
62#include <limits.h>
63#include <netdb.h>
64#include <nlist.h>
65#include <paths.h>
66#include <stdio.h>
67#include <stdlib.h>
68#include <string.h>
69#include <unistd.h>
70#include "netstat.h"
71
72static struct nlist nl[] = {
73#define	N_IFNET		0
74	{ "_ifnet" },
75#define	N_RTSTAT	1
76	{ "_rtstat" },
77#define N_RTREE		2
78	{ "_rt_tables"},
79#define N_MRTSTAT	3
80	{ "_mrtstat" },
81#define N_MFCTABLE	4
82	{ "_mfctable" },
83#define N_VIFTABLE	5
84	{ "_viftable" },
85#define N_IPX		6
86	{ "_ipxpcb_list"},
87#define N_IPXSTAT	7
88	{ "_ipxstat"},
89#define N_SPXSTAT	8
90	{ "_spx_istat"},
91#define N_DDPSTAT	9
92	{ "_ddpstat"},
93#define N_DDPCB		10
94	{ "_ddpcb"},
95#define N_NGSOCKS	11
96	{ "_ngsocklist"},
97#define N_IP6STAT	12
98	{ "_ip6stat" },
99#define N_ICMP6STAT	13
100	{ "_icmp6stat" },
101#define N_IPSECSTAT	14
102	{ "_ipsecstat" },
103#define N_IPSEC6STAT	15
104	{ "_ipsec6stat" },
105#define N_PIM6STAT	16
106	{ "_pim6stat" },
107#define N_MRT6STAT	17
108	{ "_mrt6stat" },
109#define N_MF6CTABLE	18
110	{ "_mf6ctable" },
111#define N_MIF6TABLE	19
112	{ "_mif6table" },
113#define N_PFKEYSTAT	20
114	{ "_pfkeystat" },
115#define N_MBSTAT	21
116	{ "_mbstat" },
117#define N_MBTYPES	22
118	{ "_mbtypes" },
119#define N_NMBCLUSTERS	23
120	{ "_nmbclusters" },
121#define N_NMBUFS	24
122	{ "_nmbufs" },
123#define	N_MBHI		25
124	{ "_mbuf_hiwm" },
125#define	N_CLHI		26
126	{ "_clust_hiwm" },
127#define	N_NCPUS		27
128	{ "_smp_cpus" },
129#define	N_PAGESZ	28
130	{ "_pagesize" },
131#define	N_MBPSTAT	29
132	{ "_mb_statpcpu" },
133#define	N_RTTRASH	30
134	{ "_rttrash" },
135#define	N_MBLO		31
136	{ "_mbuf_lowm" },
137#define	N_CLLO		32
138	{ "_clust_lowm" },
139#define N_CARPSTAT	33
140	{ "_carpstats" },
141#define N_PFSYNCSTAT	34
142	{ "_pfsyncstats" },
143	{ "" },
144};
145
146struct protox {
147	u_char	pr_index;		/* index into nlist of cb head */
148	u_char	pr_sindex;		/* index into nlist of stat block */
149	u_char	pr_wanted;		/* 1 if wanted, 0 otherwise */
150	void	(*pr_cblocks)(u_long, const char *, int);
151					/* control blocks printing routine */
152	void	(*pr_stats)(u_long, const char *, int);
153					/* statistics printing routine */
154	void	(*pr_istats)(char *);	/* per/if statistics printing routine */
155	const char	*pr_name;		/* well-known name */
156	u_long	pr_usesysctl;		/* non-zero if we use sysctl, not kvm */
157} protox[] = {
158	{ -1,		-1,		1,	protopr,
159	  tcp_stats,	NULL,		"tcp",	IPPROTO_TCP },
160	{ -1,		-1,		1,	protopr,
161	  udp_stats,	NULL,		"udp",	IPPROTO_UDP },
162	{ -1,		-1,		1,	protopr,
163	  NULL,		NULL,		"divert",IPPROTO_DIVERT },
164	{ -1,		-1,		1,	protopr,
165	  ip_stats,	NULL,		"ip",	IPPROTO_RAW },
166	{ -1,		-1,		1,	protopr,
167	  icmp_stats,	NULL,		"icmp",	IPPROTO_ICMP },
168	{ -1,		-1,		1,	protopr,
169	  igmp_stats,	NULL,		"igmp",	IPPROTO_IGMP },
170#ifdef IPSEC
171	{ -1,		N_IPSECSTAT,	1,	NULL,
172	  ipsec_stats,	NULL,		"ipsec",	0},
173#endif
174	{ -1,		-1,		1,	NULL,
175	  bdg_stats,	NULL,		"bdg",	1 /* bridging... */ },
176	{ -1,		-1,		1,	protopr,
177	  pim_stats,	NULL,		"pim",	IPPROTO_PIM },
178	{ -1,		N_CARPSTAT,	1,	0,
179	  carp_stats,	NULL,		"carp",		0},
180	{ -1,		-1,		1,	NULL,
181	  pfsync_stats,	NULL,		"pfsync",	1},
182	{ -1,		-1,		0,	NULL,
183	  NULL,		NULL,		NULL,	0 }
184};
185
186#ifdef INET6
187struct protox ip6protox[] = {
188	{ -1,		-1,		1,	protopr,
189	  tcp_stats,	NULL,		"tcp",	IPPROTO_TCP },
190	{ -1,		-1,		1,	protopr,
191	  udp_stats,	NULL,		"udp",	IPPROTO_UDP },
192	{ -1,		N_IP6STAT,	1,	protopr,
193	  ip6_stats,	ip6_ifstats,	"ip6",	IPPROTO_RAW },
194	{ -1,		N_ICMP6STAT,	1,	protopr,
195	  icmp6_stats,	icmp6_ifstats,	"icmp6",IPPROTO_ICMPV6 },
196#ifdef IPSEC
197	{ -1,		N_IPSEC6STAT,	1,	NULL,
198	  ipsec_stats,	NULL,		"ipsec6",0 },
199#endif
200#ifdef notyet
201	{ -1,		N_PIM6STAT,	1,	NULL,
202	  pim6_stats,	NULL,		"pim6",	0 },
203#endif
204	{ -1,		-1,		1,	NULL,
205	  rip6_stats,	NULL,		"rip6",	0 },
206	{ -1,		-1,		1,	NULL,
207	  bdg_stats,	NULL,		"bdg",	1 /* bridging... */ },
208	{ -1,		-1,		0,	NULL,
209	  NULL,		NULL,		NULL,	0 }
210};
211#endif /*INET6*/
212
213#ifdef IPSEC
214struct protox pfkeyprotox[] = {
215	{ -1,		N_PFKEYSTAT,	1,	NULL,
216	  pfkey_stats,	NULL,		"pfkey", 0 },
217	{ -1,		-1,		0,	NULL,
218	  NULL,		NULL,		NULL,	0 }
219};
220#endif
221
222struct protox atalkprotox[] = {
223	{ N_DDPCB,	N_DDPSTAT,	1,	atalkprotopr,
224	  ddp_stats,	NULL,		"ddp",	0 },
225	{ -1,		-1,		0,	NULL,
226	  NULL,		NULL,		NULL,	0 }
227};
228
229struct protox netgraphprotox[] = {
230	{ N_NGSOCKS,	-1,		1,	netgraphprotopr,
231	  NULL,		NULL,		"ctrl",	0 },
232	{ N_NGSOCKS,	-1,		1,	netgraphprotopr,
233	  NULL,		NULL,		"data",	0 },
234	{ -1,		-1,		0,	NULL,
235	  NULL,		NULL,		NULL,	0 }
236};
237
238#ifdef IPX
239struct protox ipxprotox[] = {
240	{ N_IPX,	N_IPXSTAT,	1,	ipxprotopr,
241	  ipx_stats,	NULL,		"ipx",	0 },
242	{ N_IPX,	N_SPXSTAT,	1,	ipxprotopr,
243	  spx_stats,	NULL,		"spx",	0 },
244	{ -1,		-1,		0,	NULL,
245	  NULL,		NULL,		0,	0 }
246};
247#endif
248
249struct protox *protoprotox[] = {
250					 protox,
251#ifdef INET6
252					 ip6protox,
253#endif
254#ifdef IPSEC
255					 pfkeyprotox,
256#endif
257#ifdef IPX
258					 ipxprotox,
259#endif
260					 atalkprotox, NULL };
261
262const char *pluralies(int);
263static void printproto(struct protox *, const char *);
264static void usage(void);
265static struct protox *name2protox(char *);
266static struct protox *knownname(char *);
267
268static kvm_t *kvmd;
269static char *nlistf = NULL, *memf = NULL;
270
271int	Aflag;		/* show addresses of protocol control block */
272int	aflag;		/* show all sockets (including servers) */
273int	bflag;		/* show i/f total bytes in/out */
274int	dflag;		/* show i/f dropped packets */
275int	gflag;		/* show group (multicast) routing or stats */
276int	iflag;		/* show interfaces */
277int	Lflag;		/* show size of listen queues */
278int	mflag;		/* show memory stats */
279int	numeric_addr;	/* show addresses numerically */
280int	numeric_port;	/* show ports numerically */
281static int pflag;	/* show given protocol */
282int	rflag;		/* show routing tables (or routing stats) */
283int	sflag;		/* show protocol statistics */
284int	tflag;		/* show i/f watchdog timers */
285int	Wflag;		/* wide display */
286int	zflag;		/* zero stats */
287
288int	interval;	/* repeat interval for i/f stats */
289
290char	*interface;	/* desired i/f for stats, or NULL for all i/fs */
291int	unit;		/* unit number for above */
292
293int	af;		/* address family */
294
295int
296main(int argc, char *argv[])
297{
298	struct protox *tp = NULL;  /* for printing cblocks & stats */
299	int ch;
300
301	af = AF_UNSPEC;
302
303	while ((ch = getopt(argc, argv, "Aabdf:gI:iLlM:mN:np:rSstuWw:z")) != -1)
304		switch(ch) {
305		case 'A':
306			Aflag = 1;
307			break;
308		case 'a':
309			aflag = 1;
310			break;
311		case 'b':
312			bflag = 1;
313			break;
314		case 'd':
315			dflag = 1;
316			break;
317		case 'f':
318			if (strcmp(optarg, "ipx") == 0)
319				af = AF_IPX;
320			else if (strcmp(optarg, "inet") == 0)
321				af = AF_INET;
322#ifdef INET6
323			else if (strcmp(optarg, "inet6") == 0)
324				af = AF_INET6;
325#endif /*INET6*/
326#ifdef INET6
327			else if (strcmp(optarg, "pfkey") == 0)
328				af = PF_KEY;
329#endif /*INET6*/
330			else if (strcmp(optarg, "unix") == 0)
331				af = AF_UNIX;
332			else if (strcmp(optarg, "atalk") == 0)
333				af = AF_APPLETALK;
334			else if (strcmp(optarg, "ng") == 0
335			    || strcmp(optarg, "netgraph") == 0)
336				af = AF_NETGRAPH;
337			else if (strcmp(optarg, "link") == 0)
338				af = AF_LINK;
339			else {
340				errx(1, "%s: unknown address family", optarg);
341			}
342			break;
343		case 'g':
344			gflag = 1;
345			break;
346		case 'I': {
347			char *cp;
348
349			iflag = 1;
350			for (cp = interface = optarg; isalpha(*cp); cp++)
351				continue;
352			unit = atoi(cp);
353			break;
354		}
355		case 'i':
356			iflag = 1;
357			break;
358		case 'L':
359			Lflag = 1;
360			break;
361		case 'M':
362			memf = optarg;
363			break;
364		case 'm':
365			mflag = 1;
366			break;
367		case 'N':
368			nlistf = optarg;
369			break;
370		case 'n':
371			numeric_addr = numeric_port = 1;
372			break;
373		case 'p':
374			if ((tp = name2protox(optarg)) == NULL) {
375				errx(1,
376				     "%s: unknown or uninstrumented protocol",
377				     optarg);
378			}
379			pflag = 1;
380			break;
381		case 'r':
382			rflag = 1;
383			break;
384		case 's':
385			++sflag;
386			break;
387		case 'S':
388			numeric_addr = 1;
389			break;
390		case 't':
391			tflag = 1;
392			break;
393		case 'u':
394			af = AF_UNIX;
395			break;
396		case 'W':
397		case 'l':
398			Wflag = 1;
399			break;
400		case 'w':
401			interval = atoi(optarg);
402			iflag = 1;
403			break;
404		case 'z':
405			zflag = 1;
406			break;
407		case '?':
408		default:
409			usage();
410		}
411	argv += optind;
412	argc -= optind;
413
414#define	BACKWARD_COMPATIBILITY
415#ifdef	BACKWARD_COMPATIBILITY
416	if (*argv) {
417		if (isdigit(**argv)) {
418			interval = atoi(*argv);
419			if (interval <= 0)
420				usage();
421			++argv;
422			iflag = 1;
423		}
424		if (*argv) {
425			nlistf = *argv;
426			if (*++argv)
427				memf = *argv;
428		}
429	}
430#endif
431
432	/*
433	 * Discard setgid privileges if not the running kernel so that bad
434	 * guys can't print interesting stuff from kernel memory.
435	 */
436	if (nlistf != NULL || memf != NULL)
437		setgid(getgid());
438
439	if (mflag) {
440		if (memf != NULL) {
441			if (kread(0, 0, 0) == 0)
442				mbpr(nl[N_MBSTAT].n_value,
443				    nl[N_MBTYPES].n_value,
444				    nl[N_NMBCLUSTERS].n_value,
445				    nl[N_NMBUFS].n_value,
446				    nl[N_MBHI].n_value,
447				    nl[N_CLHI].n_value,
448				    nl[N_MBLO].n_value,
449				    nl[N_CLLO].n_value,
450				    nl[N_NCPUS].n_value,
451				    nl[N_PAGESZ].n_value,
452				    nl[N_MBPSTAT].n_value);
453		} else
454			mbpr(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
455		exit(0);
456	}
457#if 0
458	/*
459	 * Keep file descriptors open to avoid overhead
460	 * of open/close on each call to get* routines.
461	 */
462	sethostent(1);
463	setnetent(1);
464#else
465	/*
466	 * This does not make sense any more with DNS being default over
467	 * the files.  Doing a setXXXXent(1) causes a tcp connection to be
468	 * used for the queries, which is slower.
469	 */
470#endif
471	if (iflag && !sflag) {
472		kread(0, 0, 0);
473		intpr(interval, nl[N_IFNET].n_value, NULL);
474		exit(0);
475	}
476	if (rflag) {
477		kread(0, 0, 0);
478		if (sflag)
479			rt_stats(nl[N_RTSTAT].n_value, nl[N_RTTRASH].n_value);
480		else
481			routepr(nl[N_RTREE].n_value);
482		exit(0);
483	}
484	if (gflag) {
485		kread(0, 0, 0);
486		if (sflag) {
487			if (af == AF_INET || af == AF_UNSPEC)
488				mrt_stats(nl[N_MRTSTAT].n_value);
489#ifdef INET6
490			if (af == AF_INET6 || af == AF_UNSPEC)
491				mrt6_stats(nl[N_MRT6STAT].n_value);
492#endif
493		} else {
494			if (af == AF_INET || af == AF_UNSPEC)
495				mroutepr(nl[N_MFCTABLE].n_value,
496					 nl[N_VIFTABLE].n_value);
497#ifdef INET6
498			if (af == AF_INET6 || af == AF_UNSPEC)
499				mroute6pr(nl[N_MF6CTABLE].n_value,
500					  nl[N_MIF6TABLE].n_value);
501#endif
502		}
503		ifmalist_dump();
504		exit(0);
505	}
506
507	kread(0, 0, 0);
508	if (tp) {
509		printproto(tp, tp->pr_name);
510		exit(0);
511	}
512	if (af == AF_INET || af == AF_UNSPEC)
513		for (tp = protox; tp->pr_name; tp++)
514			printproto(tp, tp->pr_name);
515#ifdef INET6
516	if (af == AF_INET6 || af == AF_UNSPEC)
517		for (tp = ip6protox; tp->pr_name; tp++)
518			printproto(tp, tp->pr_name);
519#endif /*INET6*/
520#ifdef IPSEC
521	if (af == PF_KEY || af == AF_UNSPEC)
522		for (tp = pfkeyprotox; tp->pr_name; tp++)
523			printproto(tp, tp->pr_name);
524#endif /*IPSEC*/
525#ifdef IPX
526	if (af == AF_IPX || af == AF_UNSPEC) {
527		kread(0, 0, 0);
528		for (tp = ipxprotox; tp->pr_name; tp++)
529			printproto(tp, tp->pr_name);
530	}
531#endif /* IPX */
532	if (af == AF_APPLETALK || af == AF_UNSPEC)
533		for (tp = atalkprotox; tp->pr_name; tp++)
534			printproto(tp, tp->pr_name);
535	if (af == AF_NETGRAPH || af == AF_UNSPEC)
536		for (tp = netgraphprotox; tp->pr_name; tp++)
537			printproto(tp, tp->pr_name);
538	if ((af == AF_UNIX || af == AF_UNSPEC) && !Lflag && !sflag)
539		unixpr();
540	exit(0);
541}
542
543/*
544 * Print out protocol statistics or control blocks (per sflag).
545 * If the interface was not specifically requested, and the symbol
546 * is not in the namelist, ignore this one.
547 */
548static void
549printproto(tp, name)
550	struct protox *tp;
551	const char *name;
552{
553	void (*pr)(u_long, const char *, int);
554	u_long off;
555
556	if (sflag) {
557		if (iflag) {
558			if (tp->pr_istats)
559				intpr(interval, nl[N_IFNET].n_value,
560				      tp->pr_istats);
561			else if (pflag)
562				printf("%s: no per-interface stats routine\n",
563				    tp->pr_name);
564			return;
565		}
566		else {
567			pr = tp->pr_stats;
568			if (!pr) {
569				if (pflag)
570					printf("%s: no stats routine\n",
571					    tp->pr_name);
572				return;
573			}
574			off = tp->pr_usesysctl ? tp->pr_usesysctl
575				: nl[tp->pr_sindex].n_value;
576		}
577	} else {
578		pr = tp->pr_cblocks;
579		if (!pr) {
580			if (pflag)
581				printf("%s: no PCB routine\n", tp->pr_name);
582			return;
583		}
584		off = tp->pr_usesysctl ? tp->pr_usesysctl
585			: nl[tp->pr_index].n_value;
586	}
587	if (pr != NULL && (off || af != AF_UNSPEC))
588		(*pr)(off, name, af);
589}
590
591/*
592 * Read kernel memory, return 0 on success.
593 */
594int
595kread(u_long addr, char *buf, int size)
596{
597	if (kvmd == 0) {
598		/*
599		 * XXX.
600		 */
601		kvmd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, buf);
602		setgid(getgid());
603		if (kvmd != NULL) {
604			if (kvm_nlist(kvmd, nl) < 0) {
605				if(nlistf)
606					errx(1, "%s: kvm_nlist: %s", nlistf,
607					     kvm_geterr(kvmd));
608				else
609					errx(1, "kvm_nlist: %s", kvm_geterr(kvmd));
610			}
611
612			if (nl[0].n_type == 0) {
613				if(nlistf)
614					errx(1, "%s: no namelist", nlistf);
615				else
616					errx(1, "no namelist");
617			}
618		} else {
619			warnx("kvm not available");
620			return(-1);
621		}
622	}
623	if (!buf)
624		return (0);
625	if (kvm_read(kvmd, addr, buf, size) != size) {
626		warnx("%s", kvm_geterr(kvmd));
627		return (-1);
628	}
629	return (0);
630}
631
632const char *
633plural(int n)
634{
635	return (n != 1 ? "s" : "");
636}
637
638const char *
639plurales(int n)
640{
641	return (n != 1 ? "es" : "");
642}
643
644const char *
645pluralies(int n)
646{
647	return (n != 1 ? "ies" : "y");
648}
649
650/*
651 * Find the protox for the given "well-known" name.
652 */
653static struct protox *
654knownname(char *name)
655{
656	struct protox **tpp, *tp;
657
658	for (tpp = protoprotox; *tpp; tpp++)
659		for (tp = *tpp; tp->pr_name; tp++)
660			if (strcmp(tp->pr_name, name) == 0)
661				return (tp);
662	return (NULL);
663}
664
665/*
666 * Find the protox corresponding to name.
667 */
668static struct protox *
669name2protox(char *name)
670{
671	struct protox *tp;
672	char **alias;			/* alias from p->aliases */
673	struct protoent *p;
674
675	/*
676	 * Try to find the name in the list of "well-known" names. If that
677	 * fails, check if name is an alias for an Internet protocol.
678	 */
679	if ((tp = knownname(name)) != NULL)
680		return (tp);
681
682	setprotoent(1);			/* make protocol lookup cheaper */
683	while ((p = getprotoent()) != NULL) {
684		/* assert: name not same as p->name */
685		for (alias = p->p_aliases; *alias; alias++)
686			if (strcmp(name, *alias) == 0) {
687				endprotoent();
688				return (knownname(p->p_name));
689			}
690	}
691	endprotoent();
692	return (NULL);
693}
694
695static void
696usage(void)
697{
698	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
699"usage: netstat [-AaLnSW] [-f protocol_family | -p protocol]\n"
700"               [-M core] [-N system]",
701"       netstat -i | -I interface [-abdnt] [-f address_family]\n"
702"               [-M core] [-N system]",
703"       netstat -w wait [-I interface] [-d] [-M core] [-N system]",
704"       netstat -s [-s] [-z] [-f protocol_family | -p protocol] [-M core]",
705"       netstat -i | -I interface -s [-f protocol_family | -p protocol]\n"
706"               [-M core] [-N system]",
707"       netstat -m [-M core] [-N system]",
708"       netstat -r [-AenW] [-f address_family] [-M core] [-N system]",
709"       netstat -rs [-s] [-M core] [-N system]",
710"       netstat -g [-W] [-f address_family] [-M core] [-N system]",
711"       netstat -gs [-s] [-f address_family] [-M core] [-N system]");
712	exit(1);
713}
714