main.c revision 265701 
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: stable/10/usr.bin/netstat/main.c 265701 2014-05-08 19:35:12Z melifaro $");
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" },		/* XXXGL: can be deleted */
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_RTTRASH	21
116	{ .n_name = "_rttrash" },
117#define	N_CARPSTAT	22
118	{ .n_name = "_carpstats" },
119#define	N_PFSYNCSTAT	23
120	{ .n_name = "_pfsyncstats" },
121#define	N_AHSTAT	24
122	{ .n_name = "_ahstat" },
123#define	N_ESPSTAT	25
124	{ .n_name = "_espstat" },
125#define	N_IPCOMPSTAT	26
126	{ .n_name = "_ipcompstat" },
127#define	N_TCPSTAT	27
128	{ .n_name = "_tcpstat" },
129#define	N_UDPSTAT	28
130	{ .n_name = "_udpstat" },
131#define	N_IPSTAT	29
132	{ .n_name = "_ipstat" },
133#define	N_ICMPSTAT	30
134	{ .n_name = "_icmpstat" },
135#define	N_IGMPSTAT	31
136	{ .n_name = "_igmpstat" },
137#define	N_PIMSTAT	32
138	{ .n_name = "_pimstat" },
139#define	N_TCBINFO	33
140	{ .n_name = "_tcbinfo" },
141#define	N_UDBINFO	34
142	{ .n_name = "_udbinfo" },
143#define	N_DIVCBINFO	35
144	{ .n_name = "_divcbinfo" },
145#define	N_RIPCBINFO	36
146	{ .n_name = "_ripcbinfo" },
147#define	N_UNP_COUNT	37
148	{ .n_name = "_unp_count" },
149#define	N_UNP_GENCNT	38
150	{ .n_name = "_unp_gencnt" },
151#define	N_UNP_DHEAD	39
152	{ .n_name = "_unp_dhead" },
153#define	N_UNP_SHEAD	40
154	{ .n_name = "_unp_shead" },
155#define	N_RIP6STAT	41
156	{ .n_name = "_rip6stat" },
157#define	N_SCTPSTAT	42
158	{ .n_name = "_sctpstat" },
159#define	N_MFCTABLESIZE	43
160	{ .n_name = "_mfctablesize" },
161#define	N_ARPSTAT       44
162	{ .n_name = "_arpstat" },
163#define	N_UNP_SPHEAD	45
164	{ .n_name = "unp_sphead" },
165#define	N_SFSTAT	46
166	{ .n_name = "_sfstat"},
167	{ .n_name = NULL },
168};
169
170struct protox {
171	int	pr_index;		/* index into nlist of cb head */
172	int	pr_sindex;		/* index into nlist of stat block */
173	u_char	pr_wanted;		/* 1 if wanted, 0 otherwise */
174	void	(*pr_cblocks)(u_long, const char *, int, int);
175					/* control blocks printing routine */
176	void	(*pr_stats)(u_long, const char *, int, int);
177					/* statistics printing routine */
178	void	(*pr_istats)(char *);	/* per/if statistics printing routine */
179	const char	*pr_name;		/* well-known name */
180	int	pr_usesysctl;		/* non-zero if we use sysctl, not kvm */
181	int	pr_protocol;
182} protox[] = {
183	{ N_TCBINFO,	N_TCPSTAT,	1,	protopr,
184	  tcp_stats,	NULL,		"tcp",	1,	IPPROTO_TCP },
185	{ N_UDBINFO,	N_UDPSTAT,	1,	protopr,
186	  udp_stats,	NULL,		"udp",	1,	IPPROTO_UDP },
187#ifdef SCTP
188	{ -1,		N_SCTPSTAT,	1,	sctp_protopr,
189	  sctp_stats,	NULL,		"sctp",	1,	IPPROTO_SCTP },
190#endif
191#ifdef SDP
192	{ -1,		-1,		1,	protopr,
193	 NULL,		NULL,		"sdp",	1,	IPPROTO_TCP },
194#endif
195	{ N_DIVCBINFO,	-1,		1,	protopr,
196	  NULL,		NULL,		"divert", 1,	IPPROTO_DIVERT },
197	{ N_RIPCBINFO,	N_IPSTAT,	1,	protopr,
198	  ip_stats,	NULL,		"ip",	1,	IPPROTO_RAW },
199	{ N_RIPCBINFO,	N_ICMPSTAT,	1,	protopr,
200	  icmp_stats,	NULL,		"icmp",	1,	IPPROTO_ICMP },
201	{ N_RIPCBINFO,	N_IGMPSTAT,	1,	protopr,
202	  igmp_stats,	NULL,		"igmp",	1,	IPPROTO_IGMP },
203#ifdef IPSEC
204	{ -1,		N_IPSECSTAT,	1,	NULL,	/* keep as compat */
205	  ipsec_stats,	NULL,		"ipsec", 0,	0},
206	{ -1,		N_AHSTAT,	1,	NULL,
207	  ah_stats,	NULL,		"ah",	0,	0},
208	{ -1,		N_ESPSTAT,	1,	NULL,
209	  esp_stats,	NULL,		"esp",	0,	0},
210	{ -1,		N_IPCOMPSTAT,	1,	NULL,
211	  ipcomp_stats,	NULL,		"ipcomp", 0,	0},
212#endif
213	{ N_RIPCBINFO,	N_PIMSTAT,	1,	protopr,
214	  pim_stats,	NULL,		"pim",	1,	IPPROTO_PIM },
215	{ -1,		N_CARPSTAT,	1,	NULL,
216	  carp_stats,	NULL,		"carp",	1,	0 },
217#ifdef PF
218	{ -1,		N_PFSYNCSTAT,	1,	NULL,
219	  pfsync_stats,	NULL,		"pfsync", 1,	0 },
220#endif
221	{ -1,		N_ARPSTAT,	1,	NULL,
222	  arp_stats,	NULL,		"arp", 1,	0 },
223	{ -1,		-1,		0,	NULL,
224	  NULL,		NULL,		NULL,	0,	0 }
225};
226
227#ifdef INET6
228struct protox ip6protox[] = {
229	{ N_TCBINFO,	N_TCPSTAT,	1,	protopr,
230	  tcp_stats,	NULL,		"tcp",	1,	IPPROTO_TCP },
231	{ N_UDBINFO,	N_UDPSTAT,	1,	protopr,
232	  udp_stats,	NULL,		"udp",	1,	IPPROTO_UDP },
233	{ N_RIPCBINFO,	N_IP6STAT,	1,	protopr,
234	  ip6_stats,	ip6_ifstats,	"ip6",	1,	IPPROTO_RAW },
235	{ N_RIPCBINFO,	N_ICMP6STAT,	1,	protopr,
236	  icmp6_stats,	icmp6_ifstats,	"icmp6", 1,	IPPROTO_ICMPV6 },
237#ifdef SDP
238	{ -1,		-1,		1,	protopr,
239	 NULL,		NULL,		"sdp",	1,	IPPROTO_TCP },
240#endif
241#ifdef IPSEC
242	{ -1,		N_IPSEC6STAT,	1,	NULL,
243	  ipsec_stats,	NULL,		"ipsec6", 0,	0 },
244#endif
245#ifdef notyet
246	{ -1,		N_PIM6STAT,	1,	NULL,
247	  pim6_stats,	NULL,		"pim6",	1,	0 },
248#endif
249	{ -1,		N_RIP6STAT,	1,	NULL,
250	  rip6_stats,	NULL,		"rip6",	1,	0 },
251	{ -1,		-1,		0,	NULL,
252	  NULL,		NULL,		NULL,	0,	0 }
253};
254#endif /*INET6*/
255
256#ifdef IPSEC
257struct protox pfkeyprotox[] = {
258	{ -1,		N_PFKEYSTAT,	1,	NULL,
259	  pfkey_stats,	NULL,		"pfkey", 0,	0 },
260	{ -1,		-1,		0,	NULL,
261	  NULL,		NULL,		NULL,	0,	0 }
262};
263#endif
264
265struct protox atalkprotox[] = {
266	{ N_DDPCB,	N_DDPSTAT,	1,	atalkprotopr,
267	  ddp_stats,	NULL,		"ddp",	0,	0 },
268	{ -1,		-1,		0,	NULL,
269	  NULL,		NULL,		NULL,	0,	0 }
270};
271#ifdef NETGRAPH
272struct protox netgraphprotox[] = {
273	{ N_NGSOCKS,	-1,		1,	netgraphprotopr,
274	  NULL,		NULL,		"ctrl",	0,	0 },
275	{ N_NGSOCKS,	-1,		1,	netgraphprotopr,
276	  NULL,		NULL,		"data",	0,	0 },
277	{ -1,		-1,		0,	NULL,
278	  NULL,		NULL,		NULL,	0,	0 }
279};
280#endif
281#ifdef IPX
282struct protox ipxprotox[] = {
283	{ N_IPX,	N_IPXSTAT,	1,	ipxprotopr,
284	  ipx_stats,	NULL,		"ipx",	0,	0 },
285	{ N_IPX,	N_SPXSTAT,	1,	ipxprotopr,
286	  spx_stats,	NULL,		"spx",	0,	0 },
287	{ -1,		-1,		0,	NULL,
288	  NULL,		NULL,		0,	0,	0 }
289};
290#endif
291
292struct protox *protoprotox[] = {
293					 protox,
294#ifdef INET6
295					 ip6protox,
296#endif
297#ifdef IPSEC
298					 pfkeyprotox,
299#endif
300#ifdef IPX
301					 ipxprotox,
302#endif
303					 atalkprotox, NULL };
304
305static void printproto(struct protox *, const char *);
306static void usage(void);
307static struct protox *name2protox(const char *);
308static struct protox *knownname(const char *);
309
310static kvm_t *kvmd;
311static char *nlistf = NULL, *memf = NULL;
312
313int	Aflag;		/* show addresses of protocol control block */
314int	aflag;		/* show all sockets (including servers) */
315int	Bflag;		/* show information about bpf consumers */
316int	bflag;		/* show i/f total bytes in/out */
317int	dflag;		/* show i/f dropped packets */
318int	gflag;		/* show group (multicast) routing or stats */
319int	hflag;		/* show counters in human readable format */
320int	iflag;		/* show interfaces */
321int	Lflag;		/* show size of listen queues */
322int	mflag;		/* show memory stats */
323int	noutputs = 0;	/* how much outputs before we exit */
324int	numeric_addr;	/* show addresses numerically */
325int	numeric_port;	/* show ports numerically */
326static int pflag;	/* show given protocol */
327int	Qflag;		/* show netisr information */
328int	rflag;		/* show routing tables (or routing stats) */
329int	sflag;		/* show protocol statistics */
330int	Wflag;		/* wide display */
331int	Tflag;		/* TCP Information */
332int	xflag;		/* extra information, includes all socket buffer info */
333int	zflag;		/* zero stats */
334
335int	interval;	/* repeat interval for i/f stats */
336
337char	*interface;	/* desired i/f for stats, or NULL for all i/fs */
338int	unit;		/* unit number for above */
339
340int	af;		/* address family */
341int	live;		/* true if we are examining a live system */
342
343int
344main(int argc, char *argv[])
345{
346	struct protox *tp = NULL;  /* for printing cblocks & stats */
347	int ch;
348	int fib = -1;
349	char *endptr;
350
351	af = AF_UNSPEC;
352
353	while ((ch = getopt(argc, argv, "46AaBbdF:f:ghI:iLlM:mN:np:Qq:rSTsuWw:xz"))
354	    != -1)
355		switch(ch) {
356		case '4':
357#ifdef INET
358			af = AF_INET;
359#else
360			errx(1, "IPv4 support is not compiled in");
361#endif
362			break;
363		case '6':
364#ifdef INET6
365			af = AF_INET6;
366#else
367			errx(1, "IPv6 support is not compiled in");
368#endif
369			break;
370		case 'A':
371			Aflag = 1;
372			break;
373		case 'a':
374			aflag = 1;
375			break;
376		case 'B':
377			Bflag = 1;
378			break;
379		case 'b':
380			bflag = 1;
381			break;
382		case 'd':
383			dflag = 1;
384			break;
385		case 'F':
386			fib = strtol(optarg, &endptr, 0);
387			if (*endptr != '\0' ||
388			    (fib == 0 && (errno == EINVAL || errno == ERANGE)))
389				errx(1, "%s: invalid fib", optarg);
390			break;
391		case 'f':
392			if (strcmp(optarg, "ipx") == 0)
393				af = AF_IPX;
394			else if (strcmp(optarg, "inet") == 0)
395				af = AF_INET;
396#ifdef INET6
397			else if (strcmp(optarg, "inet6") == 0)
398				af = AF_INET6;
399#endif
400#ifdef IPSEC
401			else if (strcmp(optarg, "pfkey") == 0)
402				af = PF_KEY;
403#endif
404			else if (strcmp(optarg, "unix") == 0)
405				af = AF_UNIX;
406			else if (strcmp(optarg, "atalk") == 0)
407				af = AF_APPLETALK;
408#ifdef NETGRAPH
409			else if (strcmp(optarg, "ng") == 0
410			    || strcmp(optarg, "netgraph") == 0)
411				af = AF_NETGRAPH;
412#endif
413			else if (strcmp(optarg, "link") == 0)
414				af = AF_LINK;
415			else {
416				errx(1, "%s: unknown address family", optarg);
417			}
418			break;
419		case 'g':
420			gflag = 1;
421			break;
422		case 'h':
423			hflag = 1;
424			break;
425		case 'I': {
426			char *cp;
427
428			iflag = 1;
429			for (cp = interface = optarg; isalpha(*cp); cp++)
430				continue;
431			unit = atoi(cp);
432			break;
433		}
434		case 'i':
435			iflag = 1;
436			break;
437		case 'L':
438			Lflag = 1;
439			break;
440		case 'M':
441			memf = optarg;
442			break;
443		case 'm':
444			mflag = 1;
445			break;
446		case 'N':
447			nlistf = optarg;
448			break;
449		case 'n':
450			numeric_addr = numeric_port = 1;
451			break;
452		case 'p':
453			if ((tp = name2protox(optarg)) == NULL) {
454				errx(1,
455				     "%s: unknown or uninstrumented protocol",
456				     optarg);
457			}
458			pflag = 1;
459			break;
460		case 'Q':
461			Qflag = 1;
462			break;
463		case 'q':
464			noutputs = atoi(optarg);
465			if (noutputs != 0)
466				noutputs++;
467			break;
468		case 'r':
469			rflag = 1;
470			break;
471		case 's':
472			++sflag;
473			break;
474		case 'S':
475			numeric_addr = 1;
476			break;
477		case 'u':
478			af = AF_UNIX;
479			break;
480		case 'W':
481		case 'l':
482			Wflag = 1;
483			break;
484		case 'w':
485			interval = atoi(optarg);
486			iflag = 1;
487			break;
488		case 'T':
489			Tflag = 1;
490			break;
491		case 'x':
492			xflag = 1;
493			break;
494		case 'z':
495			zflag = 1;
496			break;
497		case '?':
498		default:
499			usage();
500		}
501	argv += optind;
502	argc -= optind;
503
504#define	BACKWARD_COMPATIBILITY
505#ifdef	BACKWARD_COMPATIBILITY
506	if (*argv) {
507		if (isdigit(**argv)) {
508			interval = atoi(*argv);
509			if (interval <= 0)
510				usage();
511			++argv;
512			iflag = 1;
513		}
514		if (*argv) {
515			nlistf = *argv;
516			if (*++argv)
517				memf = *argv;
518		}
519	}
520#endif
521
522	/*
523	 * Discard setgid privileges if not the running kernel so that bad
524	 * guys can't print interesting stuff from kernel memory.
525	 */
526	live = (nlistf == NULL && memf == NULL);
527	if (!live)
528		setgid(getgid());
529
530	if (xflag && Tflag)
531		errx(1, "-x and -T are incompatible, pick one.");
532
533	if (Bflag) {
534		if (!live)
535			usage();
536		bpf_stats(interface);
537		exit(0);
538	}
539	if (mflag) {
540		if (!live) {
541			if (kread(0, NULL, 0) == 0)
542				mbpr(kvmd, nl[N_SFSTAT].n_value);
543		} else
544			mbpr(NULL, 0);
545		exit(0);
546	}
547	if (Qflag) {
548		if (!live) {
549			if (kread(0, NULL, 0) == 0)
550				netisr_stats(kvmd);
551		} else
552			netisr_stats(NULL);
553		exit(0);
554	}
555#if 0
556	/*
557	 * Keep file descriptors open to avoid overhead
558	 * of open/close on each call to get* routines.
559	 */
560	sethostent(1);
561	setnetent(1);
562#else
563	/*
564	 * This does not make sense any more with DNS being default over
565	 * the files.  Doing a setXXXXent(1) causes a tcp connection to be
566	 * used for the queries, which is slower.
567	 */
568#endif
569	if (iflag && !sflag) {
570		intpr(interval, NULL, af);
571		exit(0);
572	}
573	if (rflag) {
574		if (sflag) {
575			rt_stats();
576			flowtable_stats();
577		} else
578			routepr(fib, af);
579		exit(0);
580	}
581
582	if (gflag) {
583		if (sflag) {
584			if (af == AF_INET || af == AF_UNSPEC)
585				mrt_stats();
586#ifdef INET6
587			if (af == AF_INET6 || af == AF_UNSPEC)
588				mrt6_stats();
589#endif
590		} else {
591			if (af == AF_INET || af == AF_UNSPEC)
592				mroutepr();
593#ifdef INET6
594			if (af == AF_INET6 || af == AF_UNSPEC)
595				mroute6pr();
596#endif
597		}
598		exit(0);
599	}
600
601	/* Load all necessary kvm symbols */
602	kresolve_list(nl);
603
604	if (tp) {
605		printproto(tp, tp->pr_name);
606		exit(0);
607	}
608	if (af == AF_INET || af == AF_UNSPEC)
609		for (tp = protox; tp->pr_name; tp++)
610			printproto(tp, tp->pr_name);
611#ifdef INET6
612	if (af == AF_INET6 || af == AF_UNSPEC)
613		for (tp = ip6protox; tp->pr_name; tp++)
614			printproto(tp, tp->pr_name);
615#endif /*INET6*/
616#ifdef IPSEC
617	if (af == PF_KEY || af == AF_UNSPEC)
618		for (tp = pfkeyprotox; tp->pr_name; tp++)
619			printproto(tp, tp->pr_name);
620#endif /*IPSEC*/
621#ifdef IPX
622	if (af == AF_IPX || af == AF_UNSPEC) {
623		for (tp = ipxprotox; tp->pr_name; tp++)
624			printproto(tp, tp->pr_name);
625	}
626#endif /* IPX */
627	if (af == AF_APPLETALK || af == AF_UNSPEC)
628		for (tp = atalkprotox; tp->pr_name; tp++)
629			printproto(tp, tp->pr_name);
630#ifdef NETGRAPH
631	if (af == AF_NETGRAPH || af == AF_UNSPEC)
632		for (tp = netgraphprotox; tp->pr_name; tp++)
633			printproto(tp, tp->pr_name);
634#endif /* NETGRAPH */
635	if ((af == AF_UNIX || af == AF_UNSPEC) && !sflag)
636		unixpr(nl[N_UNP_COUNT].n_value, nl[N_UNP_GENCNT].n_value,
637		    nl[N_UNP_DHEAD].n_value, nl[N_UNP_SHEAD].n_value,
638		    nl[N_UNP_SPHEAD].n_value);
639	exit(0);
640}
641
642/*
643 * Print out protocol statistics or control blocks (per sflag).
644 * If the interface was not specifically requested, and the symbol
645 * is not in the namelist, ignore this one.
646 */
647static void
648printproto(struct protox *tp, const char *name)
649{
650	void (*pr)(u_long, const char *, int, int);
651	u_long off;
652
653	if (sflag) {
654		if (iflag) {
655			if (tp->pr_istats)
656				intpr(interval, tp->pr_istats, af);
657			else if (pflag)
658				printf("%s: no per-interface stats routine\n",
659				    tp->pr_name);
660			return;
661		} else {
662			pr = tp->pr_stats;
663			if (!pr) {
664				if (pflag)
665					printf("%s: no stats routine\n",
666					    tp->pr_name);
667				return;
668			}
669			if (tp->pr_usesysctl && live)
670				off = 0;
671			else if (tp->pr_sindex < 0) {
672				if (pflag)
673					printf(
674				    "%s: stats routine doesn't work on cores\n",
675					    tp->pr_name);
676				return;
677			} else
678				off = nl[tp->pr_sindex].n_value;
679		}
680	} else {
681		pr = tp->pr_cblocks;
682		if (!pr) {
683			if (pflag)
684				printf("%s: no PCB routine\n", tp->pr_name);
685			return;
686		}
687		if (tp->pr_usesysctl && live)
688			off = 0;
689		else if (tp->pr_index < 0) {
690			if (pflag)
691				printf(
692				    "%s: PCB routine doesn't work on cores\n",
693				    tp->pr_name);
694			return;
695		} else
696			off = nl[tp->pr_index].n_value;
697	}
698	if (pr != NULL && (off || (live && tp->pr_usesysctl) ||
699	    af != AF_UNSPEC))
700		(*pr)(off, name, af, tp->pr_protocol);
701}
702
703static int
704kvmd_init(void)
705{
706	char errbuf[_POSIX2_LINE_MAX];
707
708	if (kvmd != NULL)
709		return (0);
710
711	kvmd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
712	setgid(getgid());
713
714	if (kvmd == NULL) {
715		warnx("kvm not available: %s", errbuf);
716		return (-1);
717	}
718
719	return (0);
720}
721
722/*
723 * Resolve symbol list, return 0 on success.
724 */
725int
726kresolve_list(struct nlist *_nl)
727{
728
729	if ((kvmd == NULL) && (kvmd_init() != 0))
730		return (-1);
731
732	if (_nl[0].n_type != 0)
733		return (0);
734
735	if (kvm_nlist(kvmd, _nl) < 0) {
736		if (nlistf)
737			errx(1, "%s: kvm_nlist: %s", nlistf,
738			     kvm_geterr(kvmd));
739		else
740			errx(1, "kvm_nlist: %s", kvm_geterr(kvmd));
741	}
742
743	return (0);
744}
745
746/*
747 * Read kernel memory, return 0 on success.
748 */
749int
750kread(u_long addr, void *buf, size_t size)
751{
752
753	if (kvmd_init() < 0)
754		return (-1);
755
756	if (!buf)
757		return (0);
758	if (kvm_read(kvmd, addr, buf, size) != (ssize_t)size) {
759		warnx("%s", kvm_geterr(kvmd));
760		return (-1);
761	}
762	return (0);
763}
764
765/*
766 * Read single counter(9).
767 */
768uint64_t
769kread_counter(u_long addr)
770{
771
772	if (kvmd_init() < 0)
773		return (-1);
774
775	return (kvm_counter_u64_fetch(kvmd, addr));
776}
777
778/*
779 * Read an array of N counters in kernel memory into array of N uint64_t's.
780 */
781int
782kread_counters(u_long addr, void *buf, size_t size)
783{
784	uint64_t *c = buf;
785
786	if (kvmd_init() < 0)
787		return (-1);
788
789	if (kread(addr, buf, size) < 0)
790		return (-1);
791
792	while (size != 0) {
793		*c = kvm_counter_u64_fetch(kvmd, *c);
794		size -= sizeof(*c);
795		c++;
796	}
797	return (0);
798}
799
800const char *
801plural(uintmax_t n)
802{
803	return (n != 1 ? "s" : "");
804}
805
806const char *
807plurales(uintmax_t n)
808{
809	return (n != 1 ? "es" : "");
810}
811
812const char *
813pluralies(uintmax_t n)
814{
815	return (n != 1 ? "ies" : "y");
816}
817
818/*
819 * Find the protox for the given "well-known" name.
820 */
821static struct protox *
822knownname(const char *name)
823{
824	struct protox **tpp, *tp;
825
826	for (tpp = protoprotox; *tpp; tpp++)
827		for (tp = *tpp; tp->pr_name; tp++)
828			if (strcmp(tp->pr_name, name) == 0)
829				return (tp);
830	return (NULL);
831}
832
833/*
834 * Find the protox corresponding to name.
835 */
836static struct protox *
837name2protox(const char *name)
838{
839	struct protox *tp;
840	char **alias;			/* alias from p->aliases */
841	struct protoent *p;
842
843	/*
844	 * Try to find the name in the list of "well-known" names. If that
845	 * fails, check if name is an alias for an Internet protocol.
846	 */
847	if ((tp = knownname(name)) != NULL)
848		return (tp);
849
850	setprotoent(1);			/* make protocol lookup cheaper */
851	while ((p = getprotoent()) != NULL) {
852		/* assert: name not same as p->name */
853		for (alias = p->p_aliases; *alias; alias++)
854			if (strcmp(name, *alias) == 0) {
855				endprotoent();
856				return (knownname(p->p_name));
857			}
858	}
859	endprotoent();
860	return (NULL);
861}
862
863static void
864usage(void)
865{
866	(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",
867"usage: netstat [-46AaLnSTWx] [-f protocol_family | -p protocol]\n"
868"               [-M core] [-N system]",
869"       netstat -i | -I interface [-46abdhnW] [-f address_family]\n"
870"               [-M core] [-N system]",
871"       netstat -w wait [-I interface] [-46d] [-M core] [-N system] [-q howmany]",
872"       netstat -s [-s] [-46z] [-f protocol_family | -p protocol]\n"
873"               [-M core] [-N system]",
874"       netstat -i | -I interface [-46s] [-f protocol_family | -p protocol]\n"
875"               [-M core] [-N system]",
876"       netstat -m [-M core] [-N system]",
877"       netstat -B [-I interface]",
878"       netstat -r [-46AanW] [-f address_family] [-M core] [-N system]",
879"       netstat -rs [-s] [-M core] [-N system]",
880"       netstat -g [-46W] [-f address_family] [-M core] [-N system]",
881"       netstat -gs [-46s] [-f address_family] [-M core] [-N system]",
882"       netstat -Q");
883	exit(1);
884}
885