main.c revision 16080 
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
230	if ((cp = rindex(argv[0], '/')))
231		prog = cp + 1;
232	else
233		prog = argv[0];
234	af = AF_UNSPEC;
235
236	while ((ch = getopt(argc, argv, "Aabdf:ghI:iM:mN:np:rstuw:")) != EOF)
237		switch(ch) {
238		case 'A':
239			Aflag = 1;
240			break;
241		case 'a':
242			aflag = 1;
243			break;
244		case 'b':
245			bflag = 1;
246			break;
247		case 'd':
248			dflag = 1;
249			break;
250		case 'f':
251#ifdef NS
252			if (strcmp(optarg, "ns") == 0)
253				af = AF_NS;
254			else
255#endif
256			if (strcmp(optarg, "ipx") == 0)
257				af = AF_IPX;
258			else if (strcmp(optarg, "inet") == 0)
259				af = AF_INET;
260			else if (strcmp(optarg, "unix") == 0)
261				af = AF_UNIX;
262#ifdef ISO
263			else if (strcmp(optarg, "iso") == 0)
264				af = AF_ISO;
265#endif
266			else {
267				errx(1, "%s: unknown address family", optarg);
268			}
269			break;
270		case 'g':
271			gflag = 1;
272			break;
273		case 'I': {
274			char *cp;
275
276			iflag = 1;
277			for (cp = interface = optarg; isalpha(*cp); cp++)
278				continue;
279			unit = atoi(cp);
280			break;
281		}
282		case 'i':
283			iflag = 1;
284			break;
285		case 'M':
286			memf = optarg;
287			break;
288		case 'm':
289			mflag = 1;
290			break;
291		case 'N':
292			nlistf = optarg;
293			break;
294		case 'n':
295			nflag = 1;
296			break;
297		case 'p':
298			if ((tp = name2protox(optarg)) == NULL) {
299				errx(1,
300				     "%s: unknown or uninstrumented protocol",
301				     optarg);
302			}
303			pflag = 1;
304			break;
305		case 'r':
306			rflag = 1;
307			break;
308		case 's':
309			++sflag;
310			break;
311		case 't':
312			tflag = 1;
313			break;
314		case 'u':
315			af = AF_UNIX;
316			break;
317		case 'w':
318			interval = atoi(optarg);
319			iflag = 1;
320			break;
321		case '?':
322		default:
323			usage();
324		}
325	argv += optind;
326	argc -= optind;
327
328#define	BACKWARD_COMPATIBILITY
329#ifdef	BACKWARD_COMPATIBILITY
330	if (*argv) {
331		if (isdigit(**argv)) {
332			interval = atoi(*argv);
333			if (interval <= 0)
334				usage();
335			++argv;
336			iflag = 1;
337		}
338		if (*argv) {
339			nlistf = *argv;
340			if (*++argv)
341				memf = *argv;
342		}
343	}
344#endif
345
346	/*
347	 * Discard setgid privileges if not the running kernel so that bad
348	 * guys can't print interesting stuff from kernel memory.
349	 */
350	if (nlistf != NULL || memf != NULL)
351		setgid(getgid());
352
353	kvmd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, buf);
354	if (kvmd == NULL) {
355		errx(1, "kvm_open: %s", buf);
356	}
357	if (kvm_nlist(kvmd, nl) < 0) {
358		if(nlistf)
359			errx(1, "%s: kvm_nlist: %s", nlistf, kvm_geterr(kvmd));
360		else
361			errx(1, "kvm_nlist: %s", kvm_geterr(kvmd));
362	}
363
364	if (nl[0].n_type == 0) {
365		if(nlistf)
366			errx(1, "%s: no namelist", nlistf);
367		else
368			errx(1, "no namelist");
369	}
370	if (mflag) {
371		mbpr(nl[N_MBSTAT].n_value);
372		exit(0);
373	}
374	if (pflag) {
375		if (tp->pr_stats)
376			(*tp->pr_stats)(nl[tp->pr_sindex].n_value,
377				tp->pr_name);
378		else
379			printf("%s: no stats routine\n", tp->pr_name);
380		exit(0);
381	}
382#if 0
383	/*
384	 * Keep file descriptors open to avoid overhead
385	 * of open/close on each call to get* routines.
386	 */
387	sethostent(1);
388	setnetent(1);
389#else
390	/*
391	 * This does not make sense any more with DNS being default over
392	 * the files.  Doing a setXXXXent(1) causes a tcp connection to be
393	 * used for the queries, which is slower.
394	 */
395#endif
396	if (iflag) {
397		intpr(interval, nl[N_IFNET].n_value);
398		exit(0);
399	}
400	if (rflag) {
401		if (sflag)
402			rt_stats(nl[N_RTSTAT].n_value);
403		else
404			routepr(nl[N_RTREE].n_value);
405		exit(0);
406	}
407	if (gflag) {
408		if (sflag)
409			mrt_stats(nl[N_MRTPROTO].n_value,
410			    nl[N_MRTSTAT].n_value);
411		else
412			mroutepr(nl[N_MRTPROTO].n_value,
413			    nl[N_MFCTABLE].n_value,
414			    nl[N_VIFTABLE].n_value);
415		exit(0);
416	}
417	if (af == AF_INET || af == AF_UNSPEC) {
418		setprotoent(1);
419		setservent(1);
420		/* ugh, this is O(MN) ... why do we do this? */
421		while ((p = getprotoent())) {
422			for (tp = protox; tp->pr_name; tp++)
423				if (strcmp(tp->pr_name, p->p_name) == 0)
424					break;
425			if (tp->pr_name == 0 || tp->pr_wanted == 0)
426				continue;
427			printproto(tp, p->p_name);
428		}
429		endprotoent();
430	}
431	if (af == AF_IPX || af == AF_UNSPEC)
432		for (tp = ipxprotox; tp->pr_name; tp++)
433			printproto(tp, tp->pr_name);
434#ifdef NS
435	if (af == AF_NS || af == AF_UNSPEC)
436		for (tp = nsprotox; tp->pr_name; tp++)
437			printproto(tp, tp->pr_name);
438#endif
439#ifdef ISO
440	if (af == AF_ISO || af == AF_UNSPEC)
441		for (tp = isoprotox; tp->pr_name; tp++)
442			printproto(tp, tp->pr_name);
443#endif
444	if ((af == AF_UNIX || af == AF_UNSPEC) && !sflag)
445		unixpr(nl[N_UNIXSW].n_value);
446	exit(0);
447}
448
449/*
450 * Print out protocol statistics or control blocks (per sflag).
451 * If the interface was not specifically requested, and the symbol
452 * is not in the namelist, ignore this one.
453 */
454static void
455printproto(tp, name)
456	register struct protox *tp;
457	char *name;
458{
459	void (*pr)();
460	u_long off;
461
462	if (sflag) {
463		pr = tp->pr_stats;
464		off = nl[tp->pr_sindex].n_value;
465	} else {
466		pr = tp->pr_cblocks;
467		off = nl[tp->pr_index].n_value;
468	}
469	if (pr != NULL && (off || af != AF_UNSPEC))
470		(*pr)(off, name);
471}
472
473/*
474 * Read kernel memory, return 0 on success.
475 */
476int
477kread(addr, buf, size)
478	u_long addr;
479	char *buf;
480	int size;
481{
482
483	if (kvm_read(kvmd, addr, buf, size) != size) {
484		warnx("%s", kvm_geterr(kvmd));
485		return (-1);
486	}
487	return (0);
488}
489
490char *
491plural(n)
492	int n;
493{
494	return (n != 1 ? "s" : "");
495}
496
497char *
498plurales(n)
499	int n;
500{
501	return (n != 1 ? "es" : "");
502}
503
504/*
505 * Find the protox for the given "well-known" name.
506 */
507static struct protox *
508knownname(name)
509	char *name;
510{
511	struct protox **tpp, *tp;
512
513	for (tpp = protoprotox; *tpp; tpp++)
514		for (tp = *tpp; tp->pr_name; tp++)
515			if (strcmp(tp->pr_name, name) == 0)
516				return (tp);
517	return (NULL);
518}
519
520/*
521 * Find the protox corresponding to name.
522 */
523static struct protox *
524name2protox(name)
525	char *name;
526{
527	struct protox *tp;
528	char **alias;			/* alias from p->aliases */
529	struct protoent *p;
530
531	/*
532	 * Try to find the name in the list of "well-known" names. If that
533	 * fails, check if name is an alias for an Internet protocol.
534	 */
535	if ((tp = knownname(name)))
536		return (tp);
537
538	setprotoent(1);			/* make protocol lookup cheaper */
539	while ((p = getprotoent())) {
540		/* assert: name not same as p->name */
541		for (alias = p->p_aliases; *alias; alias++)
542			if (strcmp(name, *alias) == 0) {
543				endprotoent();
544				return (knownname(p->p_name));
545			}
546	}
547	endprotoent();
548	return (NULL);
549}
550
551static void
552usage()
553{
554	(void)fprintf(stderr,
555"usage: %s [-Aan] [-f address_family] [-M core] [-N system]\n", prog);
556	(void)fprintf(stderr,
557"       %s [-bdghimnrs] [-f address_family] [-M core] [-N system]\n", prog);
558	(void)fprintf(stderr,
559"       %s [-bdn] [-I interface] [-M core] [-N system] [-w wait]\n", prog);
560	(void)fprintf(stderr,
561"       %s [-M core] [-N system] [-p protocol]\n", prog);
562	exit(1);
563}
564
565void
566trimdomain(cp)
567	char *cp;
568{
569	static char domain[MAXHOSTNAMELEN + 1];
570	static int first = 1;
571	char *s;
572
573	if (first) {
574		first = 0;
575		if (gethostname(domain, MAXHOSTNAMELEN) == 0 &&
576		    (s = strchr(domain, '.')))
577			(void) strcpy(domain, s + 1);
578		else
579			domain[0] = 0;
580	}
581
582	if (domain[0]) {
583		while ((cp = strchr(cp, '.'))) {
584			if (!strcasecmp(cp + 1, domain)) {
585				*cp = 0;	/* hit it */
586				break;
587			} else {
588				cp++;
589			}
590		}
591	}
592}
593
594