main.c revision 24360 
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 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#ifndef lint
41static char sccsid[] = "@(#)main.c	8.4 (Berkeley) 3/1/94";
42#endif /* not lint */
43
44#include <sys/param.h>
45#include <sys/file.h>
46#include <sys/protosw.h>
47#include <sys/socket.h>
48
49#include <netinet/in.h>
50
51#include <ctype.h>
52#include <errno.h>
53#include <kvm.h>
54#include <limits.h>
55#include <netdb.h>
56#include <nlist.h>
57#include <paths.h>
58#include <stdio.h>
59#include <stdlib.h>
60#include <string.h>
61#include <unistd.h>
62#include <err.h>
63#include "netstat.h"
64
65struct nlist nl[] = {
66#define	N_MBSTAT	0
67	{ "_mbstat" },
68#define	N_IPSTAT	1
69	{ "_ipstat" },
70#define	N_TCB		2
71	{ "_tcb" },
72#define	N_TCPSTAT	3
73	{ "_tcpstat" },
74#define	N_UDB		4
75	{ "_udb" },
76#define	N_UDPSTAT	5
77	{ "_udpstat" },
78#define	N_IFNET		6
79	{ "_ifnet" },
80#define	N_IMP		7
81	{ "_imp_softc" },
82#define	N_ICMPSTAT	8
83	{ "_icmpstat" },
84#define	N_RTSTAT	9
85	{ "_rtstat" },
86#define	N_UNIXSW	10
87	{ "_localsw" },
88#define N_IDP		11
89	{ "_nspcb"},
90#define N_IDPSTAT	12
91	{ "_idpstat"},
92#define N_SPPSTAT	13
93	{ "_spp_istat"},
94#define N_NSERR		14
95	{ "_ns_errstat"},
96#define	N_CLNPSTAT	15
97	{ "_clnp_stat"},
98#define	IN_NOTUSED	16
99	{ "_tp_inpcb" },
100#define	ISO_TP		17
101	{ "_tp_refinfo" },
102#define	N_TPSTAT	18
103	{ "_tp_stat" },
104#define	N_ESISSTAT	19
105	{ "_esis_stat"},
106#define N_NIMP		20
107	{ "_nimp"},
108#define N_RTREE		21
109	{ "_rt_tables"},
110#define N_CLTP		22
111	{ "_cltb"},
112#define N_CLTPSTAT	23
113	{ "_cltpstat"},
114#define	N_NFILE		24
115	{ "_nfile" },
116#define	N_FILE		25
117	{ "_file" },
118#define N_IGMPSTAT	26
119	{ "_igmpstat" },
120#define N_MRTPROTO	27
121	{ "_ip_mrtproto" },
122#define N_MRTSTAT	28
123	{ "_mrtstat" },
124#define N_MFCTABLE	29
125	{ "_mfctable" },
126#define N_VIFTABLE	30
127	{ "_viftable" },
128#define N_IPX		31
129	{ "_ipxpcb"},
130#define N_IPXSTAT	32
131	{ "_ipxstat"},
132#define N_SPXSTAT	33
133	{ "_spx_istat"},
134#define N_IPXERR	34
135	{ "_ipx_errstat"},
136#define N_DDPSTAT	35
137	{ "_ddpstat"},
138#define N_DDPCB		36
139	{ "_ddpcb"},
140#define N_DIVPCB	37
141	{ "_divcb"},
142#define N_DIVSTAT	38
143	{ "_divstat"},
144	{ "" },
145};
146
147struct protox {
148	u_char	pr_index;		/* index into nlist of cb head */
149	u_char	pr_sindex;		/* index into nlist of stat block */
150	u_char	pr_wanted;		/* 1 if wanted, 0 otherwise */
151	void	(*pr_cblocks)();	/* control blocks printing routine */
152	void	(*pr_stats)();		/* statistics printing routine */
153	char	*pr_name;		/* well-known name */
154} protox[] = {
155	{ N_TCB,	N_TCPSTAT,	1,	protopr,
156	  tcp_stats,	"tcp" },
157	{ N_UDB,	N_UDPSTAT,	1,	protopr,
158	  udp_stats,	"udp" },
159	{ N_DIVPCB,	N_DIVSTAT,	1,	protopr,
160	  NULL,		"divert" }, 	/* no stat structure yet */
161	{ -1,		N_IPSTAT,	1,	0,
162	  ip_stats,	"ip" },
163	{ -1,		N_ICMPSTAT,	1,	0,
164	  icmp_stats,	"icmp" },
165	{ -1,		N_IGMPSTAT,	1,	0,
166	  igmp_stats,	"igmp" },
167	{ -1,		-1,		0,	0,
168	  0,		0 }
169};
170
171struct protox atalkprotox[] = {
172	{ N_DDPCB,	N_DDPSTAT,	1,	atalkprotopr,
173	  ddp_stats,	"ddp" },
174	{ -1,		-1,		0,	0,
175	  0,		0 }
176};
177
178struct protox ipxprotox[] = {
179	{ N_IPX,	N_IPXSTAT,	1,	ipxprotopr,
180	  ipx_stats,	"ipx" },
181	{ N_IPX,	N_SPXSTAT,	1,	ipxprotopr,
182	  spx_stats,	"spx" },
183	{ -1,		N_IPXERR,	1,	0,
184	  ipxerr_stats,	"ipx_err" },
185	{ -1,		-1,		0,	0,
186	  0,		0 }
187};
188
189#ifdef NS
190struct protox nsprotox[] = {
191	{ N_IDP,	N_IDPSTAT,	1,	nsprotopr,
192	  idp_stats,	"idp" },
193	{ N_IDP,	N_SPPSTAT,	1,	nsprotopr,
194	  spp_stats,	"spp" },
195	{ -1,		N_NSERR,	1,	0,
196	  nserr_stats,	"ns_err" },
197	{ -1,		-1,		0,	0,
198	  0,		0 }
199};
200#endif
201
202#ifdef ISO
203struct protox isoprotox[] = {
204	{ ISO_TP,	N_TPSTAT,	1,	iso_protopr,
205	  tp_stats,	"tp" },
206	{ N_CLTP,	N_CLTPSTAT,	1,	iso_protopr,
207	  cltp_stats,	"cltp" },
208	{ -1,		N_CLNPSTAT,	1,	 0,
209	  clnp_stats,	"clnp"},
210	{ -1,		N_ESISSTAT,	1,	 0,
211	  esis_stats,	"esis"},
212	{ -1,		-1,		0,	0,
213	  0,		0 }
214};
215#endif
216
217struct protox *protoprotox[] = { protox, ipxprotox, atalkprotox,
218#ifdef NS
219					 nsprotox,
220#endif
221#ifdef ISO
222					 isoprotox,
223#endif
224					 NULL };
225
226static void printproto __P((struct protox *, char *));
227static void usage __P((void));
228static struct protox *name2protox __P((char *));
229static struct protox *knownname __P((char *));
230
231kvm_t *kvmd;
232
233int
234main(argc, argv)
235	int argc;
236	char *argv[];
237{
238	extern char *optarg;
239	extern int optind;
240	register struct protoent *p;
241	register struct protox *tp;	/* for printing cblocks & stats */
242	register char *cp;
243	int ch;
244	char *nlistf = NULL, *memf = NULL;
245	char buf[_POSIX2_LINE_MAX];
246
247	if ((cp = rindex(argv[0], '/')))
248		prog = cp + 1;
249	else
250		prog = argv[0];
251	af = AF_UNSPEC;
252
253	while ((ch = getopt(argc, argv, "Aabdf:ghI:iM:mN:np:rstuw:")) != -1)
254		switch(ch) {
255		case 'A':
256			Aflag = 1;
257			break;
258		case 'a':
259			aflag = 1;
260			break;
261		case 'b':
262			bflag = 1;
263			break;
264		case 'd':
265			dflag = 1;
266			break;
267		case 'f':
268#ifdef NS
269			if (strcmp(optarg, "ns") == 0)
270				af = AF_NS;
271			else
272#endif
273			if (strcmp(optarg, "ipx") == 0)
274				af = AF_IPX;
275			else if (strcmp(optarg, "inet") == 0)
276				af = AF_INET;
277			else if (strcmp(optarg, "unix") == 0)
278				af = AF_UNIX;
279			else if (strcmp(optarg, "atalk") == 0)
280				af = AF_APPLETALK;
281#ifdef ISO
282			else if (strcmp(optarg, "iso") == 0)
283				af = AF_ISO;
284#endif
285			else {
286				errx(1, "%s: unknown address family", optarg);
287			}
288			break;
289		case 'g':
290			gflag = 1;
291			break;
292		case 'I': {
293			char *cp;
294
295			iflag = 1;
296			for (cp = interface = optarg; isalpha(*cp); cp++)
297				continue;
298			unit = atoi(cp);
299			break;
300		}
301		case 'i':
302			iflag = 1;
303			break;
304		case 'M':
305			memf = optarg;
306			break;
307		case 'm':
308			mflag = 1;
309			break;
310		case 'N':
311			nlistf = optarg;
312			break;
313		case 'n':
314			nflag = 1;
315			break;
316		case 'p':
317			if ((tp = name2protox(optarg)) == NULL) {
318				errx(1,
319				     "%s: unknown or uninstrumented protocol",
320				     optarg);
321			}
322			pflag = 1;
323			break;
324		case 'r':
325			rflag = 1;
326			break;
327		case 's':
328			++sflag;
329			break;
330		case 't':
331			tflag = 1;
332			break;
333		case 'u':
334			af = AF_UNIX;
335			break;
336		case 'w':
337			interval = atoi(optarg);
338			iflag = 1;
339			break;
340		case '?':
341		default:
342			usage();
343		}
344	argv += optind;
345	argc -= optind;
346
347#define	BACKWARD_COMPATIBILITY
348#ifdef	BACKWARD_COMPATIBILITY
349	if (*argv) {
350		if (isdigit(**argv)) {
351			interval = atoi(*argv);
352			if (interval <= 0)
353				usage();
354			++argv;
355			iflag = 1;
356		}
357		if (*argv) {
358			nlistf = *argv;
359			if (*++argv)
360				memf = *argv;
361		}
362	}
363#endif
364
365	/*
366	 * Discard setgid privileges if not the running kernel so that bad
367	 * guys can't print interesting stuff from kernel memory.
368	 */
369	if (nlistf != NULL || memf != NULL)
370		setgid(getgid());
371
372	kvmd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, buf);
373	if (kvmd == NULL) {
374		errx(1, "kvm_open: %s", buf);
375	}
376	if (kvm_nlist(kvmd, nl) < 0) {
377		if(nlistf)
378			errx(1, "%s: kvm_nlist: %s", nlistf, kvm_geterr(kvmd));
379		else
380			errx(1, "kvm_nlist: %s", kvm_geterr(kvmd));
381	}
382
383	if (nl[0].n_type == 0) {
384		if(nlistf)
385			errx(1, "%s: no namelist", nlistf);
386		else
387			errx(1, "no namelist");
388	}
389	if (mflag) {
390		mbpr(nl[N_MBSTAT].n_value);
391		exit(0);
392	}
393	if (pflag) {
394		if (tp->pr_stats)
395			(*tp->pr_stats)(nl[tp->pr_sindex].n_value,
396				tp->pr_name);
397		else
398			printf("%s: no stats routine\n", tp->pr_name);
399		exit(0);
400	}
401#if 0
402	/*
403	 * Keep file descriptors open to avoid overhead
404	 * of open/close on each call to get* routines.
405	 */
406	sethostent(1);
407	setnetent(1);
408#else
409	/*
410	 * This does not make sense any more with DNS being default over
411	 * the files.  Doing a setXXXXent(1) causes a tcp connection to be
412	 * used for the queries, which is slower.
413	 */
414#endif
415	if (iflag) {
416		intpr(interval, nl[N_IFNET].n_value);
417		exit(0);
418	}
419	if (rflag) {
420		if (sflag)
421			rt_stats(nl[N_RTSTAT].n_value);
422		else
423			routepr(nl[N_RTREE].n_value);
424		exit(0);
425	}
426	if (gflag) {
427		if (sflag)
428			mrt_stats(nl[N_MRTPROTO].n_value,
429			    nl[N_MRTSTAT].n_value);
430		else
431			mroutepr(nl[N_MRTPROTO].n_value,
432			    nl[N_MFCTABLE].n_value,
433			    nl[N_VIFTABLE].n_value);
434		exit(0);
435	}
436	if (af == AF_INET || af == AF_UNSPEC) {
437		setprotoent(1);
438		setservent(1);
439		/* ugh, this is O(MN) ... why do we do this? */
440		while ((p = getprotoent())) {
441			for (tp = protox; tp->pr_name; tp++)
442				if (strcmp(tp->pr_name, p->p_name) == 0)
443					break;
444			if (tp->pr_name == 0 || tp->pr_wanted == 0)
445				continue;
446			printproto(tp, p->p_name);
447		}
448		endprotoent();
449	}
450	if (af == AF_IPX || af == AF_UNSPEC)
451		for (tp = ipxprotox; tp->pr_name; tp++)
452			printproto(tp, tp->pr_name);
453	if (af == AF_APPLETALK || af == AF_UNSPEC)
454		for (tp = atalkprotox; tp->pr_name; tp++)
455			printproto(tp, tp->pr_name);
456#ifdef NS
457	if (af == AF_NS || af == AF_UNSPEC)
458		for (tp = nsprotox; tp->pr_name; tp++)
459			printproto(tp, tp->pr_name);
460#endif
461#ifdef ISO
462	if (af == AF_ISO || af == AF_UNSPEC)
463		for (tp = isoprotox; tp->pr_name; tp++)
464			printproto(tp, tp->pr_name);
465#endif
466	if ((af == AF_UNIX || af == AF_UNSPEC) && !sflag)
467		unixpr(nl[N_UNIXSW].n_value);
468	exit(0);
469}
470
471/*
472 * Print out protocol statistics or control blocks (per sflag).
473 * If the interface was not specifically requested, and the symbol
474 * is not in the namelist, ignore this one.
475 */
476static void
477printproto(tp, name)
478	register struct protox *tp;
479	char *name;
480{
481	void (*pr)();
482	u_long off;
483
484	if (sflag) {
485		pr = tp->pr_stats;
486		off = nl[tp->pr_sindex].n_value;
487	} else {
488		pr = tp->pr_cblocks;
489		off = nl[tp->pr_index].n_value;
490	}
491	if (pr != NULL && (off || af != AF_UNSPEC))
492		(*pr)(off, name);
493}
494
495/*
496 * Read kernel memory, return 0 on success.
497 */
498int
499kread(addr, buf, size)
500	u_long addr;
501	char *buf;
502	int size;
503{
504
505	if (kvm_read(kvmd, addr, buf, size) != size) {
506		warnx("%s", kvm_geterr(kvmd));
507		return (-1);
508	}
509	return (0);
510}
511
512char *
513plural(n)
514	int n;
515{
516	return (n != 1 ? "s" : "");
517}
518
519char *
520plurales(n)
521	int n;
522{
523	return (n != 1 ? "es" : "");
524}
525
526/*
527 * Find the protox for the given "well-known" name.
528 */
529static struct protox *
530knownname(name)
531	char *name;
532{
533	struct protox **tpp, *tp;
534
535	for (tpp = protoprotox; *tpp; tpp++)
536		for (tp = *tpp; tp->pr_name; tp++)
537			if (strcmp(tp->pr_name, name) == 0)
538				return (tp);
539	return (NULL);
540}
541
542/*
543 * Find the protox corresponding to name.
544 */
545static struct protox *
546name2protox(name)
547	char *name;
548{
549	struct protox *tp;
550	char **alias;			/* alias from p->aliases */
551	struct protoent *p;
552
553	/*
554	 * Try to find the name in the list of "well-known" names. If that
555	 * fails, check if name is an alias for an Internet protocol.
556	 */
557	if ((tp = knownname(name)))
558		return (tp);
559
560	setprotoent(1);			/* make protocol lookup cheaper */
561	while ((p = getprotoent())) {
562		/* assert: name not same as p->name */
563		for (alias = p->p_aliases; *alias; alias++)
564			if (strcmp(name, *alias) == 0) {
565				endprotoent();
566				return (knownname(p->p_name));
567			}
568	}
569	endprotoent();
570	return (NULL);
571}
572
573static void
574usage()
575{
576	(void)fprintf(stderr,
577"usage: %s [-Aan] [-f address_family] [-M core] [-N system]\n", prog);
578	(void)fprintf(stderr,
579"       %s [-bdghimnrs] [-f address_family] [-M core] [-N system]\n", prog);
580	(void)fprintf(stderr,
581"       %s [-bdn] [-I interface] [-M core] [-N system] [-w wait]\n", prog);
582	(void)fprintf(stderr,
583"       %s [-M core] [-N system] [-p protocol]\n", prog);
584	exit(1);
585}
586
587void
588trimdomain(cp)
589	char *cp;
590{
591	static char domain[MAXHOSTNAMELEN + 1];
592	static int first = 1;
593	char *s;
594
595	if (first) {
596		first = 0;
597		if (gethostname(domain, MAXHOSTNAMELEN) == 0 &&
598		    (s = strchr(domain, '.')))
599			(void) strcpy(domain, s + 1);
600		else
601			domain[0] = 0;
602	}
603
604	if (domain[0]) {
605		while ((cp = strchr(cp, '.'))) {
606			if (!strcasecmp(cp + 1, domain)) {
607				*cp = 0;	/* hit it */
608				break;
609			} else {
610				cp++;
611			}
612		}
613	}
614}
615
616