main.c revision 142215 
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 142215 2005-02-22 13:04:05Z glebius $");
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	{ "" },
142};
143
144struct protox {
145	u_char	pr_index;		/* index into nlist of cb head */
146	u_char	pr_sindex;		/* index into nlist of stat block */
147	u_char	pr_wanted;		/* 1 if wanted, 0 otherwise */
148	void	(*pr_cblocks)(u_long, const char *, int);
149					/* control blocks printing routine */
150	void	(*pr_stats)(u_long, const char *, int);
151					/* statistics printing routine */
152	void	(*pr_istats)(char *);	/* per/if statistics printing routine */
153	const char	*pr_name;		/* well-known name */
154	u_long	pr_usesysctl;		/* non-zero if we use sysctl, not kvm */
155} protox[] = {
156	{ -1,		-1,		1,	protopr,
157	  tcp_stats,	NULL,		"tcp",	IPPROTO_TCP },
158	{ -1,		-1,		1,	protopr,
159	  udp_stats,	NULL,		"udp",	IPPROTO_UDP },
160	{ -1,		-1,		1,	protopr,
161	  NULL,		NULL,		"divert",IPPROTO_DIVERT },
162	{ -1,		-1,		1,	protopr,
163	  ip_stats,	NULL,		"ip",	IPPROTO_RAW },
164	{ -1,		-1,		1,	protopr,
165	  icmp_stats,	NULL,		"icmp",	IPPROTO_ICMP },
166	{ -1,		-1,		1,	protopr,
167	  igmp_stats,	NULL,		"igmp",	IPPROTO_IGMP },
168#ifdef IPSEC
169	{ -1,		N_IPSECSTAT,	1,	NULL,
170	  ipsec_stats,	NULL,		"ipsec",	0},
171#endif
172	{ -1,		-1,		1,	NULL,
173	  bdg_stats,	NULL,		"bdg",	1 /* bridging... */ },
174	{ -1,		-1,		1,	protopr,
175	  pim_stats,	NULL,		"pim",	IPPROTO_PIM },
176	{ -1,		N_CARPSTAT,	1,	0,
177	  carp_stats,	NULL,		"carp",		0},
178	{ -1,		-1,		0,	NULL,
179	  NULL,		NULL,		NULL,	0 }
180};
181
182#ifdef INET6
183struct protox ip6protox[] = {
184	{ -1,		-1,		1,	protopr,
185	  tcp_stats,	NULL,		"tcp",	IPPROTO_TCP },
186	{ -1,		-1,		1,	protopr,
187	  udp_stats,	NULL,		"udp",	IPPROTO_UDP },
188	{ -1,		N_IP6STAT,	1,	protopr,
189	  ip6_stats,	ip6_ifstats,	"ip6",	IPPROTO_RAW },
190	{ -1,		N_ICMP6STAT,	1,	protopr,
191	  icmp6_stats,	icmp6_ifstats,	"icmp6",IPPROTO_ICMPV6 },
192#ifdef IPSEC
193	{ -1,		N_IPSEC6STAT,	1,	NULL,
194	  ipsec_stats,	NULL,		"ipsec6",0 },
195#endif
196#ifdef notyet
197	{ -1,		N_PIM6STAT,	1,	NULL,
198	  pim6_stats,	NULL,		"pim6",	0 },
199#endif
200	{ -1,		-1,		1,	NULL,
201	  rip6_stats,	NULL,		"rip6",	0 },
202	{ -1,		-1,		1,	NULL,
203	  bdg_stats,	NULL,		"bdg",	1 /* bridging... */ },
204	{ -1,		-1,		0,	NULL,
205	  NULL,		NULL,		NULL,	0 }
206};
207#endif /*INET6*/
208
209#ifdef IPSEC
210struct protox pfkeyprotox[] = {
211	{ -1,		N_PFKEYSTAT,	1,	NULL,
212	  pfkey_stats,	NULL,		"pfkey", 0 },
213	{ -1,		-1,		0,	NULL,
214	  NULL,		NULL,		NULL,	0 }
215};
216#endif
217
218struct protox atalkprotox[] = {
219	{ N_DDPCB,	N_DDPSTAT,	1,	atalkprotopr,
220	  ddp_stats,	NULL,		"ddp",	0 },
221	{ -1,		-1,		0,	NULL,
222	  NULL,		NULL,		NULL,	0 }
223};
224
225struct protox netgraphprotox[] = {
226	{ N_NGSOCKS,	-1,		1,	netgraphprotopr,
227	  NULL,		NULL,		"ctrl",	0 },
228	{ N_NGSOCKS,	-1,		1,	netgraphprotopr,
229	  NULL,		NULL,		"data",	0 },
230	{ -1,		-1,		0,	NULL,
231	  NULL,		NULL,		NULL,	0 }
232};
233
234struct protox ipxprotox[] = {
235	{ N_IPX,	N_IPXSTAT,	1,	ipxprotopr,
236	  ipx_stats,	NULL,		"ipx",	0 },
237	{ N_IPX,	N_SPXSTAT,	1,	ipxprotopr,
238	  spx_stats,	NULL,		"spx",	0 },
239	{ -1,		-1,		0,	NULL,
240	  NULL,		NULL,		0,	0 }
241};
242
243struct protox *protoprotox[] = {
244					 protox,
245#ifdef INET6
246					 ip6protox,
247#endif
248#ifdef IPSEC
249					 pfkeyprotox,
250#endif
251					 ipxprotox, atalkprotox, NULL };
252
253const char *pluralies(int);
254static void printproto(struct protox *, const char *);
255static void usage(void);
256static struct protox *name2protox(char *);
257static struct protox *knownname(char *);
258
259static kvm_t *kvmd;
260static char *nlistf = NULL, *memf = NULL;
261
262int	Aflag;		/* show addresses of protocol control block */
263int	aflag;		/* show all sockets (including servers) */
264int	bflag;		/* show i/f total bytes in/out */
265int	dflag;		/* show i/f dropped packets */
266int	gflag;		/* show group (multicast) routing or stats */
267int	iflag;		/* show interfaces */
268int	Lflag;		/* show size of listen queues */
269int	mflag;		/* show memory stats */
270int	numeric_addr;	/* show addresses numerically */
271int	numeric_port;	/* show ports numerically */
272static int pflag;	/* show given protocol */
273int	rflag;		/* show routing tables (or routing stats) */
274int	sflag;		/* show protocol statistics */
275int	tflag;		/* show i/f watchdog timers */
276int	Wflag;		/* wide display */
277int	zflag;		/* zero stats */
278
279int	interval;	/* repeat interval for i/f stats */
280
281char	*interface;	/* desired i/f for stats, or NULL for all i/fs */
282int	unit;		/* unit number for above */
283
284int	af;		/* address family */
285
286int
287main(int argc, char *argv[])
288{
289	struct protox *tp = NULL;  /* for printing cblocks & stats */
290	int ch;
291
292	af = AF_UNSPEC;
293
294	while ((ch = getopt(argc, argv, "Aabdf:gI:iLlM:mN:np:rSstuWw:z")) != -1)
295		switch(ch) {
296		case 'A':
297			Aflag = 1;
298			break;
299		case 'a':
300			aflag = 1;
301			break;
302		case 'b':
303			bflag = 1;
304			break;
305		case 'd':
306			dflag = 1;
307			break;
308		case 'f':
309			if (strcmp(optarg, "ipx") == 0)
310				af = AF_IPX;
311			else if (strcmp(optarg, "inet") == 0)
312				af = AF_INET;
313#ifdef INET6
314			else if (strcmp(optarg, "inet6") == 0)
315				af = AF_INET6;
316#endif /*INET6*/
317#ifdef INET6
318			else if (strcmp(optarg, "pfkey") == 0)
319				af = PF_KEY;
320#endif /*INET6*/
321			else if (strcmp(optarg, "unix") == 0)
322				af = AF_UNIX;
323			else if (strcmp(optarg, "atalk") == 0)
324				af = AF_APPLETALK;
325			else if (strcmp(optarg, "ng") == 0
326			    || strcmp(optarg, "netgraph") == 0)
327				af = AF_NETGRAPH;
328			else if (strcmp(optarg, "link") == 0)
329				af = AF_LINK;
330			else {
331				errx(1, "%s: unknown address family", optarg);
332			}
333			break;
334		case 'g':
335			gflag = 1;
336			break;
337		case 'I': {
338			char *cp;
339
340			iflag = 1;
341			for (cp = interface = optarg; isalpha(*cp); cp++)
342				continue;
343			unit = atoi(cp);
344			break;
345		}
346		case 'i':
347			iflag = 1;
348			break;
349		case 'L':
350			Lflag = 1;
351			break;
352		case 'M':
353			memf = optarg;
354			break;
355		case 'm':
356			mflag = 1;
357			break;
358		case 'N':
359			nlistf = optarg;
360			break;
361		case 'n':
362			numeric_addr = numeric_port = 1;
363			break;
364		case 'p':
365			if ((tp = name2protox(optarg)) == NULL) {
366				errx(1,
367				     "%s: unknown or uninstrumented protocol",
368				     optarg);
369			}
370			pflag = 1;
371			break;
372		case 'r':
373			rflag = 1;
374			break;
375		case 's':
376			++sflag;
377			break;
378		case 'S':
379			numeric_addr = 1;
380			break;
381		case 't':
382			tflag = 1;
383			break;
384		case 'u':
385			af = AF_UNIX;
386			break;
387		case 'W':
388		case 'l':
389			Wflag = 1;
390			break;
391		case 'w':
392			interval = atoi(optarg);
393			iflag = 1;
394			break;
395		case 'z':
396			zflag = 1;
397			break;
398		case '?':
399		default:
400			usage();
401		}
402	argv += optind;
403	argc -= optind;
404
405#define	BACKWARD_COMPATIBILITY
406#ifdef	BACKWARD_COMPATIBILITY
407	if (*argv) {
408		if (isdigit(**argv)) {
409			interval = atoi(*argv);
410			if (interval <= 0)
411				usage();
412			++argv;
413			iflag = 1;
414		}
415		if (*argv) {
416			nlistf = *argv;
417			if (*++argv)
418				memf = *argv;
419		}
420	}
421#endif
422
423	/*
424	 * Discard setgid privileges if not the running kernel so that bad
425	 * guys can't print interesting stuff from kernel memory.
426	 */
427	if (nlistf != NULL || memf != NULL)
428		setgid(getgid());
429
430	if (mflag) {
431		if (memf != NULL) {
432			if (kread(0, 0, 0) == 0)
433				mbpr(nl[N_MBSTAT].n_value,
434				    nl[N_MBTYPES].n_value,
435				    nl[N_NMBCLUSTERS].n_value,
436				    nl[N_NMBUFS].n_value,
437				    nl[N_MBHI].n_value,
438				    nl[N_CLHI].n_value,
439				    nl[N_MBLO].n_value,
440				    nl[N_CLLO].n_value,
441				    nl[N_NCPUS].n_value,
442				    nl[N_PAGESZ].n_value,
443				    nl[N_MBPSTAT].n_value);
444		} else
445			mbpr(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
446		exit(0);
447	}
448#if 0
449	/*
450	 * Keep file descriptors open to avoid overhead
451	 * of open/close on each call to get* routines.
452	 */
453	sethostent(1);
454	setnetent(1);
455#else
456	/*
457	 * This does not make sense any more with DNS being default over
458	 * the files.  Doing a setXXXXent(1) causes a tcp connection to be
459	 * used for the queries, which is slower.
460	 */
461#endif
462	if (iflag && !sflag) {
463		kread(0, 0, 0);
464		intpr(interval, nl[N_IFNET].n_value, NULL);
465		exit(0);
466	}
467	if (rflag) {
468		kread(0, 0, 0);
469		if (sflag)
470			rt_stats(nl[N_RTSTAT].n_value, nl[N_RTTRASH].n_value);
471		else
472			routepr(nl[N_RTREE].n_value);
473		exit(0);
474	}
475	if (gflag) {
476		kread(0, 0, 0);
477		if (sflag) {
478			if (af == AF_INET || af == AF_UNSPEC)
479				mrt_stats(nl[N_MRTSTAT].n_value);
480#ifdef INET6
481			if (af == AF_INET6 || af == AF_UNSPEC)
482				mrt6_stats(nl[N_MRT6STAT].n_value);
483#endif
484		} else {
485			if (af == AF_INET || af == AF_UNSPEC)
486				mroutepr(nl[N_MFCTABLE].n_value,
487					 nl[N_VIFTABLE].n_value);
488#ifdef INET6
489			if (af == AF_INET6 || af == AF_UNSPEC)
490				mroute6pr(nl[N_MF6CTABLE].n_value,
491					  nl[N_MIF6TABLE].n_value);
492#endif
493		}
494		ifmalist_dump();
495		exit(0);
496	}
497
498	kread(0, 0, 0);
499	if (tp) {
500		printproto(tp, tp->pr_name);
501		exit(0);
502	}
503	if (af == AF_INET || af == AF_UNSPEC)
504		for (tp = protox; tp->pr_name; tp++)
505			printproto(tp, tp->pr_name);
506#ifdef INET6
507	if (af == AF_INET6 || af == AF_UNSPEC)
508		for (tp = ip6protox; tp->pr_name; tp++)
509			printproto(tp, tp->pr_name);
510#endif /*INET6*/
511#ifdef IPSEC
512	if (af == PF_KEY || af == AF_UNSPEC)
513		for (tp = pfkeyprotox; tp->pr_name; tp++)
514			printproto(tp, tp->pr_name);
515#endif /*IPSEC*/
516	if (af == AF_IPX || af == AF_UNSPEC) {
517		kread(0, 0, 0);
518		for (tp = ipxprotox; tp->pr_name; tp++)
519			printproto(tp, tp->pr_name);
520	}
521	if (af == AF_APPLETALK || af == AF_UNSPEC)
522		for (tp = atalkprotox; tp->pr_name; tp++)
523			printproto(tp, tp->pr_name);
524	if (af == AF_NETGRAPH || af == AF_UNSPEC)
525		for (tp = netgraphprotox; tp->pr_name; tp++)
526			printproto(tp, tp->pr_name);
527	if ((af == AF_UNIX || af == AF_UNSPEC) && !Lflag && !sflag)
528		unixpr();
529	exit(0);
530}
531
532/*
533 * Print out protocol statistics or control blocks (per sflag).
534 * If the interface was not specifically requested, and the symbol
535 * is not in the namelist, ignore this one.
536 */
537static void
538printproto(tp, name)
539	struct protox *tp;
540	const char *name;
541{
542	void (*pr)(u_long, const char *, int);
543	u_long off;
544
545	if (sflag) {
546		if (iflag) {
547			if (tp->pr_istats)
548				intpr(interval, nl[N_IFNET].n_value,
549				      tp->pr_istats);
550			else if (pflag)
551				printf("%s: no per-interface stats routine\n",
552				    tp->pr_name);
553			return;
554		}
555		else {
556			pr = tp->pr_stats;
557			if (!pr) {
558				if (pflag)
559					printf("%s: no stats routine\n",
560					    tp->pr_name);
561				return;
562			}
563			off = tp->pr_usesysctl ? tp->pr_usesysctl
564				: nl[tp->pr_sindex].n_value;
565		}
566	} else {
567		pr = tp->pr_cblocks;
568		if (!pr) {
569			if (pflag)
570				printf("%s: no PCB routine\n", tp->pr_name);
571			return;
572		}
573		off = tp->pr_usesysctl ? tp->pr_usesysctl
574			: nl[tp->pr_index].n_value;
575	}
576	if (pr != NULL && (off || af != AF_UNSPEC))
577		(*pr)(off, name, af);
578}
579
580/*
581 * Read kernel memory, return 0 on success.
582 */
583int
584kread(u_long addr, char *buf, int size)
585{
586	if (kvmd == 0) {
587		/*
588		 * XXX.
589		 */
590		kvmd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, buf);
591		setgid(getgid());
592		if (kvmd != NULL) {
593			if (kvm_nlist(kvmd, nl) < 0) {
594				if(nlistf)
595					errx(1, "%s: kvm_nlist: %s", nlistf,
596					     kvm_geterr(kvmd));
597				else
598					errx(1, "kvm_nlist: %s", kvm_geterr(kvmd));
599			}
600
601			if (nl[0].n_type == 0) {
602				if(nlistf)
603					errx(1, "%s: no namelist", nlistf);
604				else
605					errx(1, "no namelist");
606			}
607		} else {
608			warnx("kvm not available");
609			return(-1);
610		}
611	}
612	if (!buf)
613		return (0);
614	if (kvm_read(kvmd, addr, buf, size) != size) {
615		warnx("%s", kvm_geterr(kvmd));
616		return (-1);
617	}
618	return (0);
619}
620
621const char *
622plural(int n)
623{
624	return (n != 1 ? "s" : "");
625}
626
627const char *
628plurales(int n)
629{
630	return (n != 1 ? "es" : "");
631}
632
633const char *
634pluralies(int n)
635{
636	return (n != 1 ? "ies" : "y");
637}
638
639/*
640 * Find the protox for the given "well-known" name.
641 */
642static struct protox *
643knownname(char *name)
644{
645	struct protox **tpp, *tp;
646
647	for (tpp = protoprotox; *tpp; tpp++)
648		for (tp = *tpp; tp->pr_name; tp++)
649			if (strcmp(tp->pr_name, name) == 0)
650				return (tp);
651	return (NULL);
652}
653
654/*
655 * Find the protox corresponding to name.
656 */
657static struct protox *
658name2protox(char *name)
659{
660	struct protox *tp;
661	char **alias;			/* alias from p->aliases */
662	struct protoent *p;
663
664	/*
665	 * Try to find the name in the list of "well-known" names. If that
666	 * fails, check if name is an alias for an Internet protocol.
667	 */
668	if ((tp = knownname(name)) != NULL)
669		return (tp);
670
671	setprotoent(1);			/* make protocol lookup cheaper */
672	while ((p = getprotoent()) != NULL) {
673		/* assert: name not same as p->name */
674		for (alias = p->p_aliases; *alias; alias++)
675			if (strcmp(name, *alias) == 0) {
676				endprotoent();
677				return (knownname(p->p_name));
678			}
679	}
680	endprotoent();
681	return (NULL);
682}
683
684static void
685usage(void)
686{
687	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
688"usage: netstat [-AaLnSW] [-f protocol_family | -p protocol]\n"
689"               [-M core] [-N system]",
690"       netstat -i | -I interface [-abdnt] [-f address_family]\n"
691"               [-M core] [-N system]",
692"       netstat -w wait [-I interface] [-d] [-M core] [-N system]",
693"       netstat -s [-s] [-z] [-f protocol_family | -p protocol] [-M core]",
694"       netstat -i | -I interface -s [-f protocol_family | -p protocol]\n"
695"               [-M core] [-N system]",
696"       netstat -m [-M core] [-N system]",
697"       netstat -r [-AenW] [-f address_family] [-M core] [-N system]",
698"       netstat -rs [-s] [-M core] [-N system]",
699"       netstat -g [-W] [-f address_family] [-M core] [-N system]",
700"       netstat -gs [-s] [-f address_family] [-M core] [-N system]");
701	exit(1);
702}
703