main.c revision 14092 
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	"",
137};
138
139struct protox {
140	u_char	pr_index;		/* index into nlist of cb head */
141	u_char	pr_sindex;		/* index into nlist of stat block */
142	u_char	pr_wanted;		/* 1 if wanted, 0 otherwise */
143	void	(*pr_cblocks)();	/* control blocks printing routine */
144	void	(*pr_stats)();		/* statistics printing routine */
145	char	*pr_name;		/* well-known name */
146} protox[] = {
147	{ N_TCB,	N_TCPSTAT,	1,	protopr,
148	  tcp_stats,	"tcp" },
149	{ N_UDB,	N_UDPSTAT,	1,	protopr,
150	  udp_stats,	"udp" },
151	{ -1,		N_IPSTAT,	1,	0,
152	  ip_stats,	"ip" },
153	{ -1,		N_ICMPSTAT,	1,	0,
154	  icmp_stats,	"icmp" },
155	{ -1,		N_IGMPSTAT,	1,	0,
156	  igmp_stats,	"igmp" },
157	{ -1,		-1,		0,	0,
158	  0,		0 }
159};
160
161struct protox ipxprotox[] = {
162	{ N_IPX,	N_IPXSTAT,	1,	ipxprotopr,
163	  ipx_stats,	"ipx" },
164	{ N_IPX,	N_SPXSTAT,	1,	ipxprotopr,
165	  spx_stats,	"spx" },
166	{ -1,		N_IPXERR,	1,	0,
167	  ipxerr_stats,	"ipx_err" },
168	{ -1,		-1,		0,	0,
169	  0,		0 }
170};
171
172#ifdef NS
173struct protox nsprotox[] = {
174	{ N_IDP,	N_IDPSTAT,	1,	nsprotopr,
175	  idp_stats,	"idp" },
176	{ N_IDP,	N_SPPSTAT,	1,	nsprotopr,
177	  spp_stats,	"spp" },
178	{ -1,		N_NSERR,	1,	0,
179	  nserr_stats,	"ns_err" },
180	{ -1,		-1,		0,	0,
181	  0,		0 }
182};
183#endif
184
185#ifdef ISO
186struct protox isoprotox[] = {
187	{ ISO_TP,	N_TPSTAT,	1,	iso_protopr,
188	  tp_stats,	"tp" },
189	{ N_CLTP,	N_CLTPSTAT,	1,	iso_protopr,
190	  cltp_stats,	"cltp" },
191	{ -1,		N_CLNPSTAT,	1,	 0,
192	  clnp_stats,	"clnp"},
193	{ -1,		N_ESISSTAT,	1,	 0,
194	  esis_stats,	"esis"},
195	{ -1,		-1,		0,	0,
196	  0,		0 }
197};
198#endif
199
200struct protox *protoprotox[] = { protox, ipxprotox,
201#ifdef NS
202					 nsprotox,
203#endif
204#ifdef ISO
205					 isoprotox,
206#endif
207					 NULL };
208
209static void printproto __P((struct protox *, char *));
210static void usage __P((void));
211static struct protox *name2protox __P((char *));
212static struct protox *knownname __P((char *));
213
214kvm_t *kvmd;
215
216int
217main(argc, argv)
218	int argc;
219	char *argv[];
220{
221	extern char *optarg;
222	extern int optind;
223	register struct protoent *p;
224	register struct protox *tp;	/* for printing cblocks & stats */
225	register char *cp;
226	int ch;
227	char *nlistf = NULL, *memf = NULL;
228	char buf[_POSIX2_LINE_MAX];
229	char buf2[_POSIX2_LINE_MAX];
230
231	if (cp = rindex(argv[0], '/'))
232		prog = cp + 1;
233	else
234		prog = argv[0];
235	af = AF_UNSPEC;
236
237	while ((ch = getopt(argc, argv, "Aabdf:ghI:iM:mN:np:rstuw:")) != EOF)
238		switch(ch) {
239		case 'A':
240			Aflag = 1;
241			break;
242		case 'a':
243			aflag = 1;
244			break;
245		case 'b':
246			bflag = 1;
247			break;
248		case 'd':
249			dflag = 1;
250			break;
251		case 'f':
252#ifdef NS
253			if (strcmp(optarg, "ns") == 0)
254				af = AF_NS;
255			else
256#endif
257			if (strcmp(optarg, "ipx") == 0)
258				af = AF_IPX;
259			else if (strcmp(optarg, "inet") == 0)
260				af = AF_INET;
261			else if (strcmp(optarg, "unix") == 0)
262				af = AF_UNIX;
263#ifdef ISO
264			else if (strcmp(optarg, "iso") == 0)
265				af = AF_ISO;
266#endif
267			else {
268				errx(1, "%s: unknown address family", optarg);
269			}
270			break;
271		case 'g':
272			gflag = 1;
273			break;
274		case 'I': {
275			char *cp;
276
277			iflag = 1;
278			for (cp = interface = optarg; isalpha(*cp); cp++)
279				continue;
280			unit = atoi(cp);
281			break;
282		}
283		case 'i':
284			iflag = 1;
285			break;
286		case 'M':
287			memf = optarg;
288			break;
289		case 'm':
290			mflag = 1;
291			break;
292		case 'N':
293			nlistf = optarg;
294			break;
295		case 'n':
296			nflag = 1;
297			break;
298		case 'p':
299			if ((tp = name2protox(optarg)) == NULL) {
300				errx(1,
301				     "%s: unknown or uninstrumented protocol",
302				     optarg);
303			}
304			pflag = 1;
305			break;
306		case 'r':
307			rflag = 1;
308			break;
309		case 's':
310			++sflag;
311			break;
312		case 't':
313			tflag = 1;
314			break;
315		case 'u':
316			af = AF_UNIX;
317			break;
318		case 'w':
319			interval = atoi(optarg);
320			iflag = 1;
321			break;
322		case '?':
323		default:
324			usage();
325		}
326	argv += optind;
327	argc -= optind;
328
329#define	BACKWARD_COMPATIBILITY
330#ifdef	BACKWARD_COMPATIBILITY
331	if (*argv) {
332		if (isdigit(**argv)) {
333			interval = atoi(*argv);
334			if (interval <= 0)
335				usage();
336			++argv;
337			iflag = 1;
338		}
339		if (*argv) {
340			nlistf = *argv;
341			if (*++argv)
342				memf = *argv;
343		}
344	}
345#endif
346
347	/*
348	 * Discard setgid privileges if not the running kernel so that bad
349	 * guys can't print interesting stuff from kernel memory.
350	 */
351	if (nlistf != NULL || memf != NULL)
352		setgid(getgid());
353
354	kvmd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, buf);
355	if (kvmd == NULL) {
356		errx(1, "kvm_open: %s", buf);
357	}
358	if (kvm_nlist(kvmd, nl) < 0) {
359		if(nlistf)
360			errx(1, "%s: kvm_nlist: %s", nlistf, kvm_geterr(kvmd));
361		else
362			errx(1, "kvm_nlist: %s", kvm_geterr(kvmd));
363	}
364
365	if (nl[0].n_type == 0) {
366		if(nlistf)
367			errx(1, "%s: no namelist", nlistf);
368		else
369			errx(1, "no namelist");
370	}
371	if (mflag) {
372		mbpr(nl[N_MBSTAT].n_value);
373		exit(0);
374	}
375	if (pflag) {
376		if (tp->pr_stats)
377			(*tp->pr_stats)(nl[tp->pr_sindex].n_value,
378				tp->pr_name);
379		else
380			printf("%s: no stats routine\n", tp->pr_name);
381		exit(0);
382	}
383#if 0
384	/*
385	 * Keep file descriptors open to avoid overhead
386	 * of open/close on each call to get* routines.
387	 */
388	sethostent(1);
389	setnetent(1);
390#else
391	/*
392	 * This does not make sense any more with DNS being default over
393	 * the files.  Doing a setXXXXent(1) causes a tcp connection to be
394	 * used for the queries, which is slower.
395	 */
396#endif
397	if (iflag) {
398		intpr(interval, nl[N_IFNET].n_value);
399		exit(0);
400	}
401	if (rflag) {
402		if (sflag)
403			rt_stats(nl[N_RTSTAT].n_value);
404		else
405			routepr(nl[N_RTREE].n_value);
406		exit(0);
407	}
408	if (gflag) {
409		if (sflag)
410			mrt_stats(nl[N_MRTPROTO].n_value,
411			    nl[N_MRTSTAT].n_value);
412		else
413			mroutepr(nl[N_MRTPROTO].n_value,
414			    nl[N_MFCTABLE].n_value,
415			    nl[N_VIFTABLE].n_value);
416		exit(0);
417	}
418	if (af == AF_INET || af == AF_UNSPEC) {
419		setprotoent(1);
420		setservent(1);
421		/* ugh, this is O(MN) ... why do we do this? */
422		while (p = getprotoent()) {
423			for (tp = protox; tp->pr_name; tp++)
424				if (strcmp(tp->pr_name, p->p_name) == 0)
425					break;
426			if (tp->pr_name == 0 || tp->pr_wanted == 0)
427				continue;
428			printproto(tp, p->p_name);
429		}
430		endprotoent();
431	}
432	if (af == AF_IPX || af == AF_UNSPEC)
433		for (tp = ipxprotox; tp->pr_name; tp++)
434			printproto(tp, tp->pr_name);
435#ifdef NS
436	if (af == AF_NS || af == AF_UNSPEC)
437		for (tp = nsprotox; tp->pr_name; tp++)
438			printproto(tp, tp->pr_name);
439#endif
440#ifdef ISO
441	if (af == AF_ISO || af == AF_UNSPEC)
442		for (tp = isoprotox; tp->pr_name; tp++)
443			printproto(tp, tp->pr_name);
444#endif
445	if ((af == AF_UNIX || af == AF_UNSPEC) && !sflag)
446		unixpr(nl[N_UNIXSW].n_value);
447	exit(0);
448}
449
450/*
451 * Print out protocol statistics or control blocks (per sflag).
452 * If the interface was not specifically requested, and the symbol
453 * is not in the namelist, ignore this one.
454 */
455static void
456printproto(tp, name)
457	register struct protox *tp;
458	char *name;
459{
460	void (*pr)();
461	u_long off;
462
463	if (sflag) {
464		pr = tp->pr_stats;
465		off = nl[tp->pr_sindex].n_value;
466	} else {
467		pr = tp->pr_cblocks;
468		off = nl[tp->pr_index].n_value;
469	}
470	if (pr != NULL && (off || af != AF_UNSPEC))
471		(*pr)(off, name);
472}
473
474/*
475 * Read kernel memory, return 0 on success.
476 */
477int
478kread(addr, buf, size)
479	u_long addr;
480	char *buf;
481	int size;
482{
483
484	if (kvm_read(kvmd, addr, buf, size) != size) {
485		warnx("%s", kvm_geterr(kvmd));
486		return (-1);
487	}
488	return (0);
489}
490
491char *
492plural(n)
493	int n;
494{
495	return (n != 1 ? "s" : "");
496}
497
498char *
499plurales(n)
500	int n;
501{
502	return (n != 1 ? "es" : "");
503}
504
505/*
506 * Find the protox for the given "well-known" name.
507 */
508static struct protox *
509knownname(name)
510	char *name;
511{
512	struct protox **tpp, *tp;
513
514	for (tpp = protoprotox; *tpp; tpp++)
515		for (tp = *tpp; tp->pr_name; tp++)
516			if (strcmp(tp->pr_name, name) == 0)
517				return (tp);
518	return (NULL);
519}
520
521/*
522 * Find the protox corresponding to name.
523 */
524static struct protox *
525name2protox(name)
526	char *name;
527{
528	struct protox *tp;
529	char **alias;			/* alias from p->aliases */
530	struct protoent *p;
531
532	/*
533	 * Try to find the name in the list of "well-known" names. If that
534	 * fails, check if name is an alias for an Internet protocol.
535	 */
536	if (tp = knownname(name))
537		return (tp);
538
539	setprotoent(1);			/* make protocol lookup cheaper */
540	while (p = getprotoent()) {
541		/* assert: name not same as p->name */
542		for (alias = p->p_aliases; *alias; alias++)
543			if (strcmp(name, *alias) == 0) {
544				endprotoent();
545				return (knownname(p->p_name));
546			}
547	}
548	endprotoent();
549	return (NULL);
550}
551
552static void
553usage()
554{
555	(void)fprintf(stderr,
556"usage: %s [-Aan] [-f address_family] [-M core] [-N system]\n", prog);
557	(void)fprintf(stderr,
558"       %s [-bdghimnrs] [-f address_family] [-M core] [-N system]\n", prog);
559	(void)fprintf(stderr,
560"       %s [-bdn] [-I interface] [-M core] [-N system] [-w wait]\n", prog);
561	(void)fprintf(stderr,
562"       %s [-M core] [-N system] [-p protocol]\n", prog);
563	exit(1);
564}
565
566void
567trimdomain(cp)
568	char *cp;
569{
570	static char domain[MAXHOSTNAMELEN + 1];
571	static int first = 1;
572	char *s;
573
574	if (first) {
575		first = 0;
576		if (gethostname(domain, MAXHOSTNAMELEN) == 0 &&
577		    (s = strchr(domain, '.')))
578			(void) strcpy(domain, s + 1);
579		else
580			domain[0] = 0;
581	}
582
583	if (domain[0]) {
584		while ((cp = strchr(cp, '.'))) {
585			if (!strcasecmp(cp + 1, domain)) {
586				*cp = 0;	/* hit it */
587				break;
588			} else {
589				cp++;
590			}
591		}
592	}
593}
594
595