/usr.bin/netstat/main.c

  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 * 4. Neither the name of the University nor the names of its contributors
 14 *    may be used to endorse or promote products derived from this software
 15 *    without specific prior written permission.
 16 *
 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 27 * SUCH DAMAGE.
 28 */
 29
 30#ifndef lint
 31char const copyright[] =
 32"@(#) Copyright (c) 1983, 1988, 1993\n\
 33	Regents of the University of California.  All rights reserved.\n";
 34#endif /* not lint */
 35
 36#if 0
 37#ifndef lint
 38static char sccsid[] = "@(#)main.c	8.4 (Berkeley) 3/1/94";
 39#endif /* not lint */
 40#endif
 41
 42#include <sys/cdefs.h>
 43__FBSDID("$FreeBSD$");
 44
 45#include <sys/param.h>
 46#include <sys/file.h>
 47#include <sys/protosw.h>
 48#include <sys/socket.h>
 49#include <sys/socketvar.h>
 50
 51#include <netinet/in.h>
 52
 53#ifdef NETGRAPH
 54#include <netgraph/ng_socket.h>
 55#endif
 56
 57#include <ctype.h>
 58#include <err.h>
 59#include <errno.h>
 60#include <kvm.h>
 61#include <limits.h>
 62#include <netdb.h>
 63#include <nlist.h>
 64#include <paths.h>
 65#include <stdint.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	{ .n_name = "_ifnet" },
 75#define	N_RTSTAT	1
 76	{ .n_name = "_rtstat" },
 77#define	N_RTREE		2
 78	{ .n_name = "_rt_tables"},
 79#define	N_MRTSTAT	3
 80	{ .n_name = "_mrtstat" },
 81#define	N_MFCHASHTBL	4
 82	{ .n_name = "_mfchashtbl" },
 83#define	N_VIFTABLE	5
 84	{ .n_name = "_viftable" },
 85#define	N_IPX		6
 86	{ .n_name = "_ipxpcb_list"},
 87#define	N_IPXSTAT	7
 88	{ .n_name = "_ipxstat"},
 89#define	N_SPXSTAT	8
 90	{ .n_name = "_spx_istat"},
 91#define	N_DDPSTAT	9
 92	{ .n_name = "_ddpstat"},
 93#define	N_DDPCB		10
 94	{ .n_name = "_ddpcb"},
 95#define	N_NGSOCKS	11
 96	{ .n_name = "_ngsocklist"},
 97#define	N_IP6STAT	12
 98	{ .n_name = "_ip6stat" },
 99#define	N_ICMP6STAT	13
100	{ .n_name = "_icmp6stat" },
101#define	N_IPSECSTAT	14
102	{ .n_name = "_ipsec4stat" },
103#define	N_IPSEC6STAT	15
104	{ .n_name = "_ipsec6stat" },
105#define	N_PIM6STAT	16
106	{ .n_name = "_pim6stat" },
107#define	N_MRT6STAT	17
108	{ .n_name = "_mrt6stat" },
109#define	N_MF6CTABLE	18
110	{ .n_name = "_mf6ctable" },
111#define	N_MIF6TABLE	19
112	{ .n_name = "_mif6table" },
113#define	N_PFKEYSTAT	20
114	{ .n_name = "_pfkeystat" },
115#define	N_MBSTAT	21
116	{ .n_name = "_mbstat" },
117#define	N_MBTYPES	22
118	{ .n_name = "_mbtypes" },
119#define	N_NMBCLUSTERS	23
120	{ .n_name = "_nmbclusters" },
121#define	N_NMBUFS	24
122	{ .n_name = "_nmbufs" },
123#define	N_MBHI		25
124	{ .n_name = "_mbuf_hiwm" },
125#define	N_CLHI		26
126	{ .n_name = "_clust_hiwm" },
127#define	N_NCPUS		27
128	{ .n_name = "_smp_cpus" },
129#define	N_PAGESZ	28
130	{ .n_name = "_pagesize" },
131#define	N_MBPSTAT	29
132	{ .n_name = "_mb_statpcpu" },
133#define	N_RTTRASH	30
134	{ .n_name = "_rttrash" },
135#define	N_MBLO		31
136	{ .n_name = "_mbuf_lowm" },
137#define	N_CLLO		32
138	{ .n_name = "_clust_lowm" },
139#define	N_CARPSTAT	33
140	{ .n_name = "_carpstats" },
141#define	N_PFSYNCSTAT	34
142	{ .n_name = "_pfsyncstats" },
143#define	N_AHSTAT	35
144	{ .n_name = "_ahstat" },
145#define	N_ESPSTAT	36
146	{ .n_name = "_espstat" },
147#define	N_IPCOMPSTAT	37
148	{ .n_name = "_ipcompstat" },
149#define	N_TCPSTAT	38
150	{ .n_name = "_tcpstat" },
151#define	N_UDPSTAT	39
152	{ .n_name = "_udpstat" },
153#define	N_IPSTAT	40
154	{ .n_name = "_ipstat" },
155#define	N_ICMPSTAT	41
156	{ .n_name = "_icmpstat" },
157#define	N_IGMPSTAT	42
158	{ .n_name = "_igmpstat" },
159#define	N_PIMSTAT	43
160	{ .n_name = "_pimstat" },
161#define	N_TCBINFO	44
162	{ .n_name = "_tcbinfo" },
163#define	N_UDBINFO	45
164	{ .n_name = "_udbinfo" },
165#define	N_DIVCBINFO	46
166	{ .n_name = "_divcbinfo" },
167#define	N_RIPCBINFO	47
168	{ .n_name = "_ripcbinfo" },
169#define	N_UNP_COUNT	48
170	{ .n_name = "_unp_count" },
171#define	N_UNP_GENCNT	49
172	{ .n_name = "_unp_gencnt" },
173#define	N_UNP_DHEAD	50
174	{ .n_name = "_unp_dhead" },
175#define	N_UNP_SHEAD	51
176	{ .n_name = "_unp_shead" },
177#define	N_RIP6STAT	52
178	{ .n_name = "_rip6stat" },
179#define	N_SCTPSTAT	53
180	{ .n_name = "_sctpstat" },
181#define	N_MFCTABLESIZE	54
182	{ .n_name = "_mfctablesize" },
183#define N_ARPSTAT       55
184	{ .n_name = "_arpstat" },
185#define	N_UNP_SPHEAD	56
186	{ .n_name = "unp_sphead" },
187	{ .n_name = NULL },
188};
189
190struct protox {
191	int	pr_index;		/* index into nlist of cb head */
192	int	pr_sindex;		/* index into nlist of stat block */
193	u_char	pr_wanted;		/* 1 if wanted, 0 otherwise */
194	void	(*pr_cblocks)(u_long, const char *, int, int);
195					/* control blocks printing routine */
196	void	(*pr_stats)(u_long, const char *, int, int);
197					/* statistics printing routine */
198	void	(*pr_istats)(char *);	/* per/if statistics printing routine */
199	const char	*pr_name;		/* well-known name */
200	int	pr_usesysctl;		/* non-zero if we use sysctl, not kvm */
201	int	pr_protocol;
202} protox[] = {
203	{ N_TCBINFO,	N_TCPSTAT,	1,	protopr,
204	  tcp_stats,	NULL,		"tcp",	1,	IPPROTO_TCP },
205	{ N_UDBINFO,	N_UDPSTAT,	1,	protopr,
206	  udp_stats,	NULL,		"udp",	1,	IPPROTO_UDP },
207#ifdef SCTP
208	{ -1,		N_SCTPSTAT,	1,	sctp_protopr,
209	  sctp_stats,	NULL,		"sctp",	1,	IPPROTO_SCTP },
210#endif
211#ifdef SDP
212	{ -1,		-1,		1,	protopr,
213	 NULL,		NULL,		"sdp",	1,	IPPROTO_TCP },
214#endif
215	{ N_DIVCBINFO,	-1,		1,	protopr,
216	  NULL,		NULL,		"divert", 1,	IPPROTO_DIVERT },
217	{ N_RIPCBINFO,	N_IPSTAT,	1,	protopr,
218	  ip_stats,	NULL,		"ip",	1,	IPPROTO_RAW },
219	{ N_RIPCBINFO,	N_ICMPSTAT,	1,	protopr,
220	  icmp_stats,	NULL,		"icmp",	1,	IPPROTO_ICMP },
221	{ N_RIPCBINFO,	N_IGMPSTAT,	1,	protopr,
222	  igmp_stats,	NULL,		"igmp",	1,	IPPROTO_IGMP },
223#ifdef IPSEC
224	{ -1,		N_IPSECSTAT,	1,	NULL,	/* keep as compat */
225	  ipsec_stats,	NULL,		"ipsec", 0,	0},
226	{ -1,		N_AHSTAT,	1,	NULL,
227	  ah_stats,	NULL,		"ah",	0,	0},
228	{ -1,		N_ESPSTAT,	1,	NULL,
229	  esp_stats,	NULL,		"esp",	0,	0},
230	{ -1,		N_IPCOMPSTAT,	1,	NULL,
231	  ipcomp_stats,	NULL,		"ipcomp", 0,	0},
232#endif
233	{ N_RIPCBINFO,	N_PIMSTAT,	1,	protopr,
234	  pim_stats,	NULL,		"pim",	1,	IPPROTO_PIM },
235	{ -1,		N_CARPSTAT,	1,	NULL,
236	  carp_stats,	NULL,		"carp",	1,	0 },
237	{ -1,		N_PFSYNCSTAT,	1,	NULL,
238	  pfsync_stats,	NULL,		"pfsync", 1,	0 },
239	{ -1,		N_ARPSTAT,	1,	NULL,
240	  arp_stats,	NULL,		"arp", 1,	0 },
241	{ -1,		-1,		0,	NULL,
242	  NULL,		NULL,		NULL,	0,	0 }
243};
244
245#ifdef INET6
246struct protox ip6protox[] = {
247	{ N_TCBINFO,	N_TCPSTAT,	1,	protopr,
248	  tcp_stats,	NULL,		"tcp",	1,	IPPROTO_TCP },
249	{ N_UDBINFO,	N_UDPSTAT,	1,	protopr,
250	  udp_stats,	NULL,		"udp",	1,	IPPROTO_UDP },
251	{ N_RIPCBINFO,	N_IP6STAT,	1,	protopr,
252	  ip6_stats,	ip6_ifstats,	"ip6",	1,	IPPROTO_RAW },
253	{ N_RIPCBINFO,	N_ICMP6STAT,	1,	protopr,
254	  icmp6_stats,	icmp6_ifstats,	"icmp6", 1,	IPPROTO_ICMPV6 },
255#ifdef SDP
256	{ -1,		-1,		1,	protopr,
257	 NULL,		NULL,		"sdp",	1,	IPPROTO_TCP },
258#endif
259#ifdef IPSEC
260	{ -1,		N_IPSEC6STAT,	1,	NULL,
261	  ipsec_stats,	NULL,		"ipsec6", 0,	0 },
262#endif
263#ifdef notyet
264	{ -1,		N_PIM6STAT,	1,	NULL,
265	  pim6_stats,	NULL,		"pim6",	1,	0 },
266#endif
267	{ -1,		N_RIP6STAT,	1,	NULL,
268	  rip6_stats,	NULL,		"rip6",	1,	0 },
269	{ -1,		-1,		0,	NULL,
270	  NULL,		NULL,		NULL,	0,	0 }
271};
272#endif /*INET6*/
273
274#ifdef IPSEC
275struct protox pfkeyprotox[] = {
276	{ -1,		N_PFKEYSTAT,	1,	NULL,
277	  pfkey_stats,	NULL,		"pfkey", 0,	0 },
278	{ -1,		-1,		0,	NULL,
279	  NULL,		NULL,		NULL,	0,	0 }
280};
281#endif
282
283struct protox atalkprotox[] = {
284	{ N_DDPCB,	N_DDPSTAT,	1,	atalkprotopr,
285	  ddp_stats,	NULL,		"ddp",	0,	0 },
286	{ -1,		-1,		0,	NULL,
287	  NULL,		NULL,		NULL,	0,	0 }
288};
289#ifdef NETGRAPH
290struct protox netgraphprotox[] = {
291	{ N_NGSOCKS,	-1,		1,	netgraphprotopr,
292	  NULL,		NULL,		"ctrl",	0,	0 },
293	{ N_NGSOCKS,	-1,		1,	netgraphprotopr,
294	  NULL,		NULL,		"data",	0,	0 },
295	{ -1,		-1,		0,	NULL,
296	  NULL,		NULL,		NULL,	0,	0 }
297};
298#endif
299#ifdef IPX
300struct protox ipxprotox[] = {
301	{ N_IPX,	N_IPXSTAT,	1,	ipxprotopr,
302	  ipx_stats,	NULL,		"ipx",	0,	0 },
303	{ N_IPX,	N_SPXSTAT,	1,	ipxprotopr,
304	  spx_stats,	NULL,		"spx",	0,	0 },
305	{ -1,		-1,		0,	NULL,
306	  NULL,		NULL,		0,	0,	0 }
307};
308#endif
309
310struct protox *protoprotox[] = {
311					 protox,
312#ifdef INET6
313					 ip6protox,
314#endif
315#ifdef IPSEC
316					 pfkeyprotox,
317#endif
318#ifdef IPX
319					 ipxprotox,
320#endif
321					 atalkprotox, NULL };
322
323static void printproto(struct protox *, const char *);
324static void usage(void);
325static struct protox *name2protox(const char *);
326static struct protox *knownname(const char *);
327
328static kvm_t *kvmd;
329static char *nlistf = NULL, *memf = NULL;
330
331int	Aflag;		/* show addresses of protocol control block */
332int	aflag;		/* show all sockets (including servers) */
333int	Bflag;		/* show information about bpf consumers */
334int	bflag;		/* show i/f total bytes in/out */
335int	dflag;		/* show i/f dropped packets */
336int	gflag;		/* show group (multicast) routing or stats */
337int	hflag;		/* show counters in human readable format */
338int	iflag;		/* show interfaces */
339int	Lflag;		/* show size of listen queues */
340int	mflag;		/* show memory stats */
341int	noutputs = 0;	/* how much outputs before we exit */
342int	numeric_addr;	/* show addresses numerically */
343int	numeric_port;	/* show ports numerically */
344static int pflag;	/* show given protocol */
345int	Qflag;		/* show netisr information */
346int	rflag;		/* show routing tables (or routing stats) */
347int	sflag;		/* show protocol statistics */
348int	Wflag;		/* wide display */
349int	Tflag;		/* TCP Information */
350int	xflag;		/* extra information, includes all socket buffer info */
351int	zflag;		/* zero stats */
352
353int	interval;	/* repeat interval for i/f stats */
354
355char	*interface;	/* desired i/f for stats, or NULL for all i/fs */
356int	unit;		/* unit number for above */
357
358int	af;		/* address family */
359int	live;		/* true if we are examining a live system */
360
361int
362main(int argc, char *argv[])
363{
364	struct protox *tp = NULL;  /* for printing cblocks & stats */
365	int ch;
366
367	af = AF_UNSPEC;
368
369	while ((ch = getopt(argc, argv, "AaBbdf:ghI:iLlM:mN:np:Qq:rSTsuWw:xz"))
370	    != -1)
371		switch(ch) {
372		case 'A':
373			Aflag = 1;
374			break;
375		case 'a':
376			aflag = 1;
377			break;
378		case 'B':
379			Bflag = 1;
380			break;
381		case 'b':
382			bflag = 1;
383			break;
384		case 'd':
385			dflag = 1;
386			break;
387		case 'f':
388			if (strcmp(optarg, "ipx") == 0)
389				af = AF_IPX;
390			else if (strcmp(optarg, "inet") == 0)
391				af = AF_INET;
392#ifdef INET6
393			else if (strcmp(optarg, "inet6") == 0)
394				af = AF_INET6;
395#endif
396#ifdef IPSEC
397			else if (strcmp(optarg, "pfkey") == 0)
398				af = PF_KEY;
399#endif
400			else if (strcmp(optarg, "unix") == 0)
401				af = AF_UNIX;
402			else if (strcmp(optarg, "atalk") == 0)
403				af = AF_APPLETALK;
404#ifdef NETGRAPH
405			else if (strcmp(optarg, "ng") == 0
406			    || strcmp(optarg, "netgraph") == 0)
407				af = AF_NETGRAPH;
408#endif
409			else if (strcmp(optarg, "link") == 0)
410				af = AF_LINK;
411			else {
412				errx(1, "%s: unknown address family", optarg);
413			}
414			break;
415		case 'g':
416			gflag = 1;
417			break;
418		case 'h':
419			hflag = 1;
420			break;
421		case 'I': {
422			char *cp;
423
424			iflag = 1;
425			for (cp = interface = optarg; isalpha(*cp); cp++)
426				continue;
427			unit = atoi(cp);
428			break;
429		}
430		case 'i':
431			iflag = 1;
432			break;
433		case 'L':
434			Lflag = 1;
435			break;
436		case 'M':
437			memf = optarg;
438			break;
439		case 'm':
440			mflag = 1;
441			break;
442		case 'N':
443			nlistf = optarg;
444			break;
445		case 'n':
446			numeric_addr = numeric_port = 1;
447			break;
448		case 'p':
449			if ((tp = name2protox(optarg)) == NULL) {
450				errx(1,
451				     "%s: unknown or uninstrumented protocol",
452				     optarg);
453			}
454			pflag = 1;
455			break;
456		case 'Q':
457			Qflag = 1;
458			break;
459		case 'q':
460			noutputs = atoi(optarg);
461			if (noutputs != 0)
462				noutputs++;
463			break;
464		case 'r':
465			rflag = 1;
466			break;
467		case 's':
468			++sflag;
469			break;
470		case 'S':
471			numeric_addr = 1;
472			break;
473		case 'u':
474			af = AF_UNIX;
475			break;
476		case 'W':
477		case 'l':
478			Wflag = 1;
479			break;
480		case 'w':
481			interval = atoi(optarg);
482			iflag = 1;
483			break;
484		case 'T':
485			Tflag = 1;
486			break;
487		case 'x':
488			xflag = 1;
489			break;
490		case 'z':
491			zflag = 1;
492			break;
493		case '?':
494		default:
495			usage();
496		}
497	argv += optind;
498	argc -= optind;
499
500#define	BACKWARD_COMPATIBILITY
501#ifdef	BACKWARD_COMPATIBILITY
502	if (*argv) {
503		if (isdigit(**argv)) {
504			interval = atoi(*argv);
505			if (interval <= 0)
506				usage();
507			++argv;
508			iflag = 1;
509		}
510		if (*argv) {
511			nlistf = *argv;
512			if (*++argv)
513				memf = *argv;
514		}
515	}
516#endif
517
518	/*
519	 * Discard setgid privileges if not the running kernel so that bad
520	 * guys can't print interesting stuff from kernel memory.
521	 */
522	live = (nlistf == NULL && memf == NULL);
523	if (!live)
524		setgid(getgid());
525
526	if (xflag && Tflag) 
527		errx(1, "-x and -T are incompatible, pick one.");
528
529	if (Bflag) {
530		if (!live)
531			usage();
532		bpf_stats(interface);
533		exit(0);
534	}
535	if (mflag) {
536		if (!live) {
537			if (kread(0, NULL, 0) == 0)
538				mbpr(kvmd, nl[N_MBSTAT].n_value);
539		} else
540			mbpr(NULL, 0);
541		exit(0);
542	}
543	if (Qflag) {
544		if (!live) {
545			if (kread(0, NULL, 0) == 0)
546				netisr_stats(kvmd);
547		} else
548			netisr_stats(NULL);
549		exit(0);
550	}
551#if 0
552	/*
553	 * Keep file descriptors open to avoid overhead
554	 * of open/close on each call to get* routines.
555	 */
556	sethostent(1);
557	setnetent(1);
558#else
559	/*
560	 * This does not make sense any more with DNS being default over
561	 * the files.  Doing a setXXXXent(1) causes a tcp connection to be
562	 * used for the queries, which is slower.
563	 */
564#endif
565	kread(0, NULL, 0);
566	if (iflag && !sflag) {
567		intpr(interval, nl[N_IFNET].n_value, NULL);
568		exit(0);
569	}
570	if (rflag) {
571		if (sflag)
572			rt_stats(nl[N_RTSTAT].n_value, nl[N_RTTRASH].n_value);
573		else
574			routepr(nl[N_RTREE].n_value);
575		exit(0);
576	}
577	if (gflag) {
578		if (sflag) {
579			if (af == AF_INET || af == AF_UNSPEC)
580				mrt_stats(nl[N_MRTSTAT].n_value);
581#ifdef INET6
582			if (af == AF_INET6 || af == AF_UNSPEC)
583				mrt6_stats(nl[N_MRT6STAT].n_value);
584#endif
585		} else {
586			if (af == AF_INET || af == AF_UNSPEC)
587				mroutepr(nl[N_MFCHASHTBL].n_value,
588					 nl[N_MFCTABLESIZE].n_value,
589					 nl[N_VIFTABLE].n_value);
590#ifdef INET6
591			if (af == AF_INET6 || af == AF_UNSPEC)
592				mroute6pr(nl[N_MF6CTABLE].n_value,
593					  nl[N_MIF6TABLE].n_value);
594#endif
595		}
596		exit(0);
597	}
598
599	if (tp) {
600		printproto(tp, tp->pr_name);
601		exit(0);
602	}
603	if (af == AF_INET || af == AF_UNSPEC)
604		for (tp = protox; tp->pr_name; tp++)
605			printproto(tp, tp->pr_name);
606#ifdef INET6
607	if (af == AF_INET6 || af == AF_UNSPEC)
608		for (tp = ip6protox; tp->pr_name; tp++)
609			printproto(tp, tp->pr_name);
610#endif /*INET6*/
611#ifdef IPSEC
612	if (af == PF_KEY || af == AF_UNSPEC)
613		for (tp = pfkeyprotox; tp->pr_name; tp++)
614			printproto(tp, tp->pr_name);
615#endif /*IPSEC*/
616#ifdef IPX
617	if (af == AF_IPX || af == AF_UNSPEC) {
618		for (tp = ipxprotox; tp->pr_name; tp++)
619			printproto(tp, tp->pr_name);
620	}
621#endif /* IPX */
622	if (af == AF_APPLETALK || af == AF_UNSPEC)
623		for (tp = atalkprotox; tp->pr_name; tp++)
624			printproto(tp, tp->pr_name);
625#ifdef NETGRAPH
626	if (af == AF_NETGRAPH || af == AF_UNSPEC)
627		for (tp = netgraphprotox; tp->pr_name; tp++)
628			printproto(tp, tp->pr_name);
629#endif /* NETGRAPH */
630	if ((af == AF_UNIX || af == AF_UNSPEC) && !sflag)
631		unixpr(nl[N_UNP_COUNT].n_value, nl[N_UNP_GENCNT].n_value,
632		    nl[N_UNP_DHEAD].n_value, nl[N_UNP_SHEAD].n_value,
633		    nl[N_UNP_SPHEAD].n_value);
634	exit(0);
635}
636
637/*
638 * Print out protocol statistics or control blocks (per sflag).
639 * If the interface was not specifically requested, and the symbol
640 * is not in the namelist, ignore this one.
641 */
642static void
643printproto(tp, name)
644	struct protox *tp;
645	const char *name;
646{
647	void (*pr)(u_long, const char *, int, int);
648	u_long off;
649
650	if (sflag) {
651		if (iflag) {
652			if (tp->pr_istats)
653				intpr(interval, nl[N_IFNET].n_value,
654				      tp->pr_istats);
655			else if (pflag)
656				printf("%s: no per-interface stats routine\n",
657				    tp->pr_name);
658			return;
659		} else {
660			pr = tp->pr_stats;
661			if (!pr) {
662				if (pflag)
663					printf("%s: no stats routine\n",
664					    tp->pr_name);
665				return;
666			}
667			if (tp->pr_usesysctl && live)
668				off = 0;
669			else if (tp->pr_sindex < 0) {
670				if (pflag)
671					printf(
672				    "%s: stats routine doesn't work on cores\n",
673					    tp->pr_name);
674				return;
675			} else
676				off = nl[tp->pr_sindex].n_value;
677		}
678	} else {
679		pr = tp->pr_cblocks;
680		if (!pr) {
681			if (pflag)
682				printf("%s: no PCB routine\n", tp->pr_name);
683			return;
684		}
685		if (tp->pr_usesysctl && live)
686			off = 0;
687		else if (tp->pr_index < 0) {
688			if (pflag)
689				printf(
690				    "%s: PCB routine doesn't work on cores\n",
691				    tp->pr_name);
692			return;
693		} else
694			off = nl[tp->pr_index].n_value;
695	}
696	if (pr != NULL && (off || (live && tp->pr_usesysctl) ||
697	    af != AF_UNSPEC))
698		(*pr)(off, name, af, tp->pr_protocol);
699}
700
701/*
702 * Read kernel memory, return 0 on success.
703 */
704int
705kread(u_long addr, void *buf, size_t size)
706{
707	char errbuf[_POSIX2_LINE_MAX];
708
709	if (kvmd == NULL) {
710		kvmd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
711		setgid(getgid());
712		if (kvmd != NULL) {
713			if (kvm_nlist(kvmd, nl) < 0) {
714				if (nlistf)
715					errx(1, "%s: kvm_nlist: %s", nlistf,
716					     kvm_geterr(kvmd));
717				else
718					errx(1, "kvm_nlist: %s", kvm_geterr(kvmd));
719			}
720
721			if (nl[0].n_type == 0) {
722				if (nlistf)
723					errx(1, "%s: no namelist", nlistf);
724				else
725					errx(1, "no namelist");
726			}
727		} else {
728			warnx("kvm not available: %s", errbuf);
729			return(-1);
730		}
731	}
732	if (!buf)
733		return (0);
734	if (kvm_read(kvmd, addr, buf, size) != (ssize_t)size) {
735		warnx("%s", kvm_geterr(kvmd));
736		return (-1);
737	}
738	return (0);
739}
740
741const char *
742plural(uintmax_t n)
743{
744	return (n != 1 ? "s" : "");
745}
746
747const char *
748plurales(uintmax_t n)
749{
750	return (n != 1 ? "es" : "");
751}
752
753const char *
754pluralies(uintmax_t n)
755{
756	return (n != 1 ? "ies" : "y");
757}
758
759/*
760 * Find the protox for the given "well-known" name.
761 */
762static struct protox *
763knownname(const char *name)
764{
765	struct protox **tpp, *tp;
766
767	for (tpp = protoprotox; *tpp; tpp++)
768		for (tp = *tpp; tp->pr_name; tp++)
769			if (strcmp(tp->pr_name, name) == 0)
770				return (tp);
771	return (NULL);
772}
773
774/*
775 * Find the protox corresponding to name.
776 */
777static struct protox *
778name2protox(const char *name)
779{
780	struct protox *tp;
781	char **alias;			/* alias from p->aliases */
782	struct protoent *p;
783
784	/*
785	 * Try to find the name in the list of "well-known" names. If that
786	 * fails, check if name is an alias for an Internet protocol.
787	 */
788	if ((tp = knownname(name)) != NULL)
789		return (tp);
790
791	setprotoent(1);			/* make protocol lookup cheaper */
792	while ((p = getprotoent()) != NULL) {
793		/* assert: name not same as p->name */
794		for (alias = p->p_aliases; *alias; alias++)
795			if (strcmp(name, *alias) == 0) {
796				endprotoent();
797				return (knownname(p->p_name));
798			}
799	}
800	endprotoent();
801	return (NULL);
802}
803
804static void
805usage(void)
806{
807	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
808"usage: netstat [-AaLnSTWx] [-f protocol_family | -p protocol]\n"
809"               [-M core] [-N system]",
810"       netstat -i | -I interface [-abdhnW] [-f address_family]\n"
811"               [-M core] [-N system]",
812"       netstat -w wait [-I interface] [-d] [-M core] [-N system] [-q howmany]",
813"       netstat -s [-s] [-z] [-f protocol_family | -p protocol]\n"
814"               [-M core] [-N system]",
815"       netstat -i | -I interface -s [-f protocol_family | -p protocol]\n"
816"               [-M core] [-N system]",
817"       netstat -m [-M core] [-N system]",
818"       netstat -B [-I interface]",
819"       netstat -r [-AanW] [-f address_family] [-M core] [-N system]",
820"       netstat -rs [-s] [-M core] [-N system]",
821"       netstat -g [-W] [-f address_family] [-M core] [-N system]",
822"       netstat -gs [-s] [-f address_family] [-M core] [-N system]",
823"       netstat -Q");
824	exit(1);
825}