Fix some mis-usages of NULL.
[dragonfly.git] / usr.bin / netstat / main.c
CommitLineData
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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.
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32 *
33 * @(#) Copyright (c) 1983, 1988, 1993 Regents of the University of California. All rights reserved.
34 * @(#)main.c 8.4 (Berkeley) 3/1/94
35 * $FreeBSD: src/usr.bin/netstat/main.c,v 1.34.2.12 2001/09/17 15:17:46 ru Exp $
eecd52b2 36 * $DragonFly: src/usr.bin/netstat/main.c,v 1.14 2007/11/25 18:10:07 swildner Exp $
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37 */
38
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39#include <sys/param.h>
40#include <sys/file.h>
41#include <sys/protosw.h>
42#include <sys/socket.h>
43
44#include <netinet/in.h>
45
38a690d7 46#include <netgraph/socket/ng_socket.h>
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47
48#include <ctype.h>
49#include <err.h>
50#include <errno.h>
51#include <kvm.h>
52#include <limits.h>
53#include <netdb.h>
54#include <nlist.h>
55#include <paths.h>
56#include <stdio.h>
57#include <stdlib.h>
58#include <string.h>
59#include <unistd.h>
60#include "netstat.h"
61
62static struct nlist nl[] = {
63#define N_IFNET 0
64 { "_ifnet" },
65#define N_IMP 1
66 { "_imp_softc" },
67#define N_RTSTAT 2
68 { "_rtstat" },
69#define N_UNIXSW 3
70 { "_localsw" },
71#define N_IDP 4
72 { "_nspcb"},
73#define N_IDPSTAT 5
74 { "_idpstat"},
75#define N_SPPSTAT 6
76 { "_spp_istat"},
77#define N_NSERR 7
78 { "_ns_errstat"},
79#define N_CLNPSTAT 8
80 { "_clnp_stat"},
81#define IN_NOTUSED 9
82 { "_tp_inpcb" },
83#define ISO_TP 10
84 { "_tp_refinfo" },
85#define N_TPSTAT 11
86 { "_tp_stat" },
87#define N_ESISSTAT 12
88 { "_esis_stat"},
89#define N_NIMP 13
90 { "_nimp"},
91#define N_RTREE 14
92 { "_rt_tables"},
93#define N_CLTP 15
94 { "_cltb"},
95#define N_CLTPSTAT 16
96 { "_cltpstat"},
97#define N_NFILE 17
98 { "_nfile" },
99#define N_FILE 18
100 { "_file" },
101#define N_MRTSTAT 19
102 { "_mrtstat" },
103#define N_MFCTABLE 20
104 { "_mfctable" },
105#define N_VIFTABLE 21
106 { "_viftable" },
107#define N_IPX 22
108 { "_ipxpcb"},
109#define N_IPXSTAT 23
110 { "_ipxstat"},
111#define N_SPXSTAT 24
112 { "_spx_istat"},
113#define N_DDPSTAT 25
114 { "_ddpstat"},
115#define N_DDPCB 26
116 { "_ddpcb"},
117#define N_NGSOCKS 27
118 { "_ngsocklist"},
119#define N_IP6STAT 28
120 { "_ip6stat" },
121#define N_ICMP6STAT 29
122 { "_icmp6stat" },
123#define N_IPSECSTAT 30
124 { "_ipsecstat" },
125#define N_IPSEC6STAT 31
126 { "_ipsec6stat" },
127#define N_PIM6STAT 32
128 { "_pim6stat" },
129#define N_MRT6PROTO 33
130 { "_ip6_mrtproto" },
131#define N_MRT6STAT 34
132 { "_mrt6stat" },
133#define N_MF6CTABLE 35
134 { "_mf6ctable" },
135#define N_MIF6TABLE 36
136 { "_mif6table" },
137#define N_PFKEYSTAT 37
138 { "_pfkeystat" },
139#define N_MBSTAT 38
140 { "_mbstat" },
141#define N_MBTYPES 39
142 { "_mbtypes" },
143#define N_NMBCLUSTERS 40
144 { "_nmbclusters" },
145#define N_NMBUFS 41
146 { "_nmbufs" },
147#define N_RTTRASH 42
148 { "_rttrash" },
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149#define N_NCPUS 43
150 { "_ncpus" },
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151#define N_CARPSTAT 44
152 { "_carpstats" },
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153 { "" },
154};
155
156struct protox {
157 u_char pr_index; /* index into nlist of cb head */
158 u_char pr_sindex; /* index into nlist of stat block */
159 u_char pr_wanted; /* 1 if wanted, 0 otherwise */
160 void (*pr_cblocks)(u_long, char *, int);
161 /* control blocks printing routine */
162 void (*pr_stats)(u_long, char *, int);
163 /* statistics printing routine */
164 void (*pr_istats)(char *); /* per/if statistics printing routine */
165 char *pr_name; /* well-known name */
166 int pr_usesysctl; /* true if we use sysctl, not kvm */
167} protox[] = {
168 { -1, -1, 1, protopr,
169 tcp_stats, NULL, "tcp", IPPROTO_TCP },
170 { -1, -1, 1, protopr,
171 udp_stats, NULL, "udp", IPPROTO_UDP },
172 { -1, -1, 1, protopr,
173 NULL, NULL, "divert",IPPROTO_DIVERT },
174 { -1, -1, 1, protopr,
175 ip_stats, NULL, "ip", IPPROTO_RAW },
176 { -1, -1, 1, protopr,
177 icmp_stats, NULL, "icmp", IPPROTO_ICMP },
178 { -1, -1, 1, protopr,
179 igmp_stats, NULL, "igmp", IPPROTO_IGMP },
180#ifdef IPSEC
181 { -1, N_IPSECSTAT, 1, 0,
182 ipsec_stats, NULL, "ipsec", 0},
183#endif
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184 { -1, N_CARPSTAT, 1, 0,
185 carp_stats, NULL, "carp", 0},
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186 { -1, -1, 0, 0,
187 0, NULL, 0 }
188};
189
190#ifdef INET6
191struct protox ip6protox[] = {
192 { -1, -1, 1, protopr,
193 tcp_stats, NULL, "tcp", IPPROTO_TCP },
194 { -1, -1, 1, protopr,
195 udp_stats, NULL, "udp", IPPROTO_UDP },
196 { -1, N_IP6STAT, 1, protopr,
197 ip6_stats, ip6_ifstats, "ip6", IPPROTO_RAW },
198 { -1, N_ICMP6STAT, 1, protopr,
199 icmp6_stats, icmp6_ifstats, "icmp6",IPPROTO_ICMPV6 },
200#ifdef IPSEC
201 { -1, N_IPSEC6STAT, 1, 0,
202 ipsec_stats, NULL, "ipsec6",0 },
203#endif
204#ifdef notyet
205 { -1, N_PIM6STAT, 1, 0,
206 pim6_stats, NULL, "pim6", 0 },
207#endif
208 { -1, -1, 1, 0,
209 rip6_stats, NULL, "rip6", 0 },
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210 { -1, -1, 1, protopr,
211 pim_stats, NULL, "pim", IPPROTO_PIM },
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212 { -1, -1, 0, 0,
213 0, NULL, 0, 0 }
214};
215#endif /*INET6*/
216
217#ifdef IPSEC
218struct protox pfkeyprotox[] = {
219 { -1, N_PFKEYSTAT, 1, 0,
220 pfkey_stats, NULL, "pfkey", 0 },
221 { -1, -1, 0, 0,
222 0, NULL, 0, 0 }
223};
224#endif
225
226struct protox atalkprotox[] = {
227 { N_DDPCB, N_DDPSTAT, 1, atalkprotopr,
228 ddp_stats, NULL, "ddp" },
229 { -1, -1, 0, 0,
230 0, NULL, 0 }
231};
232
233struct protox netgraphprotox[] = {
234 { N_NGSOCKS, -1, 1, netgraphprotopr,
235 NULL, NULL, "ctrl" },
236 { N_NGSOCKS, -1, 1, netgraphprotopr,
237 NULL, NULL, "data" },
eecd52b2 238 { -1, -1, 0, 0,
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239 0, NULL, 0 }
240};
241
242struct protox ipxprotox[] = {
243 { N_IPX, N_IPXSTAT, 1, ipxprotopr,
244 ipx_stats, NULL, "ipx", 0 },
245 { N_IPX, N_SPXSTAT, 1, ipxprotopr,
246 spx_stats, NULL, "spx", 0 },
247 { -1, -1, 0, 0,
248 0, NULL, 0, 0 }
249};
250
251#ifdef NS
252struct protox nsprotox[] = {
253 { N_IDP, N_IDPSTAT, 1, nsprotopr,
254 idp_stats, NULL, "idp" },
255 { N_IDP, N_SPPSTAT, 1, nsprotopr,
256 spp_stats, NULL, "spp" },
257 { -1, N_NSERR, 1, 0,
258 nserr_stats, NULL, "ns_err" },
259 { -1, -1, 0, 0,
260 0, NULL, 0 }
261};
262#endif
263
264#ifdef ISO
265struct protox isoprotox[] = {
266 { ISO_TP, N_TPSTAT, 1, iso_protopr,
267 tp_stats, NULL, "tp" },
268 { N_CLTP, N_CLTPSTAT, 1, iso_protopr,
269 cltp_stats, NULL, "cltp" },
270 { -1, N_CLNPSTAT, 1, 0,
271 clnp_stats, NULL, "clnp"},
272 { -1, N_ESISSTAT, 1, 0,
273 esis_stats, NULL, "esis"},
274 { -1, -1, 0, 0,
275 0, NULL, 0 }
276};
277#endif
278
279struct protox *protoprotox[] = {
280 protox,
281#ifdef INET6
282 ip6protox,
283#endif
284#ifdef IPSEC
285 pfkeyprotox,
286#endif
287 ipxprotox, atalkprotox,
288#ifdef NS
289 nsprotox,
290#endif
291#ifdef ISO
292 isoprotox,
293#endif
294 NULL };
295
296static void printproto (struct protox *, char *);
297static void usage (void);
298static struct protox *name2protox (char *);
299static struct protox *knownname (char *);
300
301static kvm_t *kvmd;
302static char *nlistf = NULL, *memf = NULL;
303
304int Aflag; /* show addresses of protocol control block */
305int aflag; /* show all sockets (including servers) */
306int bflag; /* show i/f total bytes in/out */
b06a5e2a 307int cpuflag = -1; /* dump route table from specific cpu */
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308int dflag; /* show i/f dropped packets */
309int gflag; /* show group (multicast) routing or stats */
310int iflag; /* show interfaces */
311int Lflag; /* show size of listen queues */
312int mflag; /* show memory stats */
ae94c427 313int Pflag; /* show more protocol info (go past 80 columns) */
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314int numeric_addr; /* show addresses numerically */
315int numeric_port; /* show ports numerically */
316static int pflag; /* show given protocol */
317int rflag; /* show routing tables (or routing stats) */
318int sflag; /* show protocol statistics */
319int tflag; /* show i/f watchdog timers */
caed4051 320int Bflag; /* show buffer limit instead of buffer use */
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321int Wflag; /* wide display */
322int zflag; /* zero stats */
323
324int interval; /* repeat interval for i/f stats */
325
326char *interface; /* desired i/f for stats, or NULL for all i/fs */
327int unit; /* unit number for above */
328
329int af; /* address family */
330
331int
1d1731fa 332main(int argc, char **argv)
984263bc 333{
6bd457ed 334 struct protox *tp = NULL; /* for printing cblocks & stats */
984263bc 335 int ch;
b06a5e2a 336 int n;
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337
338 af = AF_UNSPEC;
339
b06a5e2a 340 while ((ch = getopt(argc, argv, "Aabc:df:gI:iLlM:mN:nPp:rSsBtuWw:z")) != -1)
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341 switch(ch) {
342 case 'A':
343 Aflag = 1;
344 break;
345 case 'a':
346 aflag = 1;
347 break;
348 case 'b':
349 bflag = 1;
350 break;
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351 case 'c':
352 kread(0, 0, 0);
353 kread(nl[N_NCPUS].n_value, (char *)&n, sizeof(n));
354 cpuflag = strtol(optarg, NULL, 0);
355 if (cpuflag < 0 || cpuflag >= n)
356 errx(1, "cpu %d does not exist", cpuflag);
357 break;
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358 case 'd':
359 dflag = 1;
360 break;
361 case 'f':
362#ifdef NS
363 if (strcmp(optarg, "ns") == 0)
364 af = AF_NS;
365 else
366#endif
367 if (strcmp(optarg, "ipx") == 0)
368 af = AF_IPX;
369 else if (strcmp(optarg, "inet") == 0)
370 af = AF_INET;
371#ifdef INET6
372 else if (strcmp(optarg, "inet6") == 0)
373 af = AF_INET6;
374#endif /*INET6*/
375#ifdef INET6
376 else if (strcmp(optarg, "pfkey") == 0)
377 af = PF_KEY;
378#endif /*INET6*/
379 else if (strcmp(optarg, "unix") == 0)
380 af = AF_UNIX;
381 else if (strcmp(optarg, "atalk") == 0)
382 af = AF_APPLETALK;
383 else if (strcmp(optarg, "ng") == 0
384 || strcmp(optarg, "netgraph") == 0)
385 af = AF_NETGRAPH;
386#ifdef ISO
387 else if (strcmp(optarg, "iso") == 0)
388 af = AF_ISO;
389#endif
390 else if (strcmp(optarg, "link") == 0)
391 af = AF_LINK;
392 else {
393 errx(1, "%s: unknown address family", optarg);
394 }
395 break;
396 case 'g':
397 gflag = 1;
398 break;
399 case 'I': {
400 char *cp;
401
402 iflag = 1;
403 for (cp = interface = optarg; isalpha(*cp); cp++)
404 continue;
405 unit = atoi(cp);
406 break;
407 }
408 case 'i':
409 iflag = 1;
410 break;
411 case 'L':
412 Lflag = 1;
413 break;
414 case 'M':
415 memf = optarg;
416 break;
417 case 'm':
418 mflag = 1;
419 break;
420 case 'N':
421 nlistf = optarg;
422 break;
423 case 'n':
424 numeric_addr = numeric_port = 1;
425 break;
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426 case 'P':
427 Pflag = 1;
428 break;
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429 case 'p':
430 if ((tp = name2protox(optarg)) == NULL) {
431 errx(1,
432 "%s: unknown or uninstrumented protocol",
433 optarg);
434 }
435 pflag = 1;
436 break;
437 case 'r':
438 rflag = 1;
439 break;
440 case 's':
441 ++sflag;
442 break;
443 case 'S':
444 numeric_addr = 1;
445 break;
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446 case 'B':
447 Bflag = 1;
448 break;
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449 case 't':
450 tflag = 1;
451 break;
452 case 'u':
453 af = AF_UNIX;
454 break;
455 case 'W':
456 case 'l':
457 Wflag = 1;
458 break;
459 case 'w':
460 interval = atoi(optarg);
461 iflag = 1;
462 break;
463 case 'z':
464 zflag = 1;
465 break;
466 case '?':
467 default:
468 usage();
469 }
470 argv += optind;
471 argc -= optind;
472
473#define BACKWARD_COMPATIBILITY
474#ifdef BACKWARD_COMPATIBILITY
475 if (*argv) {
476 if (isdigit(**argv)) {
477 interval = atoi(*argv);
478 if (interval <= 0)
479 usage();
480 ++argv;
481 iflag = 1;
482 }
483 if (*argv) {
484 nlistf = *argv;
485 if (*++argv)
486 memf = *argv;
487 }
488 }
489#endif
490
491 /*
492 * Discard setgid privileges if not the running kernel so that bad
493 * guys can't print interesting stuff from kernel memory.
494 */
495 if (nlistf != NULL || memf != NULL)
496 setgid(getgid());
497
498 if (mflag) {
499 if (memf != NULL) {
500 if (kread(0, 0, 0) == 0)
501 mbpr(nl[N_MBSTAT].n_value,
502 nl[N_MBTYPES].n_value,
503 nl[N_NMBCLUSTERS].n_value,
504 nl[N_NMBUFS].n_value);
505 } else
506 mbpr(0, 0, 0, 0);
507 exit(0);
508 }
509#if 0
510 /*
511 * Keep file descriptors open to avoid overhead
512 * of open/close on each call to get* routines.
513 */
514 sethostent(1);
515 setnetent(1);
516#else
517 /*
518 * This does not make sense any more with DNS being default over
519 * the files. Doing a setXXXXent(1) causes a tcp connection to be
520 * used for the queries, which is slower.
521 */
522#endif
523 if (iflag && !sflag) {
524 kread(0, 0, 0);
525 intpr(interval, nl[N_IFNET].n_value, NULL);
526 exit(0);
527 }
528 if (rflag) {
529 kread(0, 0, 0);
530 if (sflag)
72ce0f6d 531 rt_stats();
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532 else
533 routepr(nl[N_RTREE].n_value);
534 exit(0);
535 }
536 if (gflag) {
537 kread(0, 0, 0);
538 if (sflag) {
539 if (af == AF_INET || af == AF_UNSPEC)
540 mrt_stats(nl[N_MRTSTAT].n_value);
541#ifdef INET6
542 if (af == AF_INET6 || af == AF_UNSPEC)
543 mrt6_stats(nl[N_MRT6STAT].n_value);
544#endif
545 } else {
546 if (af == AF_INET || af == AF_UNSPEC)
547 mroutepr(nl[N_MFCTABLE].n_value,
548 nl[N_VIFTABLE].n_value);
549#ifdef INET6
550 if (af == AF_INET6 || af == AF_UNSPEC)
551 mroute6pr(nl[N_MF6CTABLE].n_value,
552 nl[N_MIF6TABLE].n_value);
553#endif
554 }
555 exit(0);
556 }
557
558 kread(0, 0, 0);
559 if (tp) {
560 printproto(tp, tp->pr_name);
561 exit(0);
562 }
563 if (af == AF_INET || af == AF_UNSPEC)
564 for (tp = protox; tp->pr_name; tp++)
565 printproto(tp, tp->pr_name);
566#ifdef INET6
567 if (af == AF_INET6 || af == AF_UNSPEC)
568 for (tp = ip6protox; tp->pr_name; tp++)
569 printproto(tp, tp->pr_name);
570#endif /*INET6*/
571#ifdef IPSEC
572 if (af == PF_KEY || af == AF_UNSPEC)
573 for (tp = pfkeyprotox; tp->pr_name; tp++)
574 printproto(tp, tp->pr_name);
575#endif /*IPSEC*/
576 if (af == AF_IPX || af == AF_UNSPEC) {
577 kread(0, 0, 0);
578 for (tp = ipxprotox; tp->pr_name; tp++)
579 printproto(tp, tp->pr_name);
580 }
581 if (af == AF_APPLETALK || af == AF_UNSPEC)
582 for (tp = atalkprotox; tp->pr_name; tp++)
583 printproto(tp, tp->pr_name);
584 if (af == AF_NETGRAPH || af == AF_UNSPEC)
585 for (tp = netgraphprotox; tp->pr_name; tp++)
586 printproto(tp, tp->pr_name);
587#ifdef NS
588 if (af == AF_NS || af == AF_UNSPEC)
589 for (tp = nsprotox; tp->pr_name; tp++)
590 printproto(tp, tp->pr_name);
591#endif
592#ifdef ISO
593 if (af == AF_ISO || af == AF_UNSPEC)
594 for (tp = isoprotox; tp->pr_name; tp++)
595 printproto(tp, tp->pr_name);
596#endif
597 if ((af == AF_UNIX || af == AF_UNSPEC) && !Lflag && !sflag)
598 unixpr();
599 exit(0);
600}
601
602/*
603 * Print out protocol statistics or control blocks (per sflag).
604 * If the interface was not specifically requested, and the symbol
605 * is not in the namelist, ignore this one.
606 */
607static void
6bd457ed 608printproto(struct protox *tp, char *name)
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609{
610 void (*pr)(u_long, char *, int);
611 u_long off;
612
613 if (sflag) {
614 if (iflag) {
615 if (tp->pr_istats)
616 intpr(interval, nl[N_IFNET].n_value,
617 tp->pr_istats);
618 else if (pflag)
619 printf("%s: no per-interface stats routine\n",
620 tp->pr_name);
621 return;
622 }
623 else {
624 pr = tp->pr_stats;
625 if (!pr) {
626 if (pflag)
627 printf("%s: no stats routine\n",
628 tp->pr_name);
629 return;
630 }
631 off = tp->pr_usesysctl ? tp->pr_usesysctl
632 : nl[tp->pr_sindex].n_value;
633 }
634 } else {
635 pr = tp->pr_cblocks;
636 if (!pr) {
637 if (pflag)
638 printf("%s: no PCB routine\n", tp->pr_name);
639 return;
640 }
641 off = tp->pr_usesysctl ? tp->pr_usesysctl
642 : nl[tp->pr_index].n_value;
643 }
644 if (pr != NULL && (off || af != AF_UNSPEC))
645 (*pr)(off, name, af);
646}
647
648/*
649 * Read kernel memory, return 0 on success.
650 */
651int
652kread(u_long addr, char *buf, int size)
653{
654 if (kvmd == 0) {
655 /*
656 * XXX.
657 */
658 kvmd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, buf);
659 if (kvmd != NULL) {
660 if (kvm_nlist(kvmd, nl) < 0) {
661 if(nlistf)
662 errx(1, "%s: kvm_nlist: %s", nlistf,
663 kvm_geterr(kvmd));
664 else
665 errx(1, "kvm_nlist: %s", kvm_geterr(kvmd));
666 }
667
668 if (nl[0].n_type == 0) {
669 if(nlistf)
670 errx(1, "%s: no namelist", nlistf);
671 else
672 errx(1, "no namelist");
673 }
674 } else {
675 warnx("kvm not available");
676 return(-1);
677 }
678 }
679 if (!buf)
680 return (0);
681 if (kvm_read(kvmd, addr, buf, size) != size) {
682 warnx("%s", kvm_geterr(kvmd));
683 return (-1);
684 }
685 return (0);
686}
687
688char *
689plural(int n)
690{
691 return (n != 1 ? "s" : "");
692}
693
694char *
695plurales(int n)
696{
697 return (n != 1 ? "es" : "");
698}
699
700/*
701 * Find the protox for the given "well-known" name.
702 */
703static struct protox *
704knownname(char *name)
705{
706 struct protox **tpp, *tp;
707
708 for (tpp = protoprotox; *tpp; tpp++)
709 for (tp = *tpp; tp->pr_name; tp++)
710 if (strcmp(tp->pr_name, name) == 0)
711 return (tp);
712 return (NULL);
713}
714
715/*
716 * Find the protox corresponding to name.
717 */
718static struct protox *
719name2protox(char *name)
720{
721 struct protox *tp;
722 char **alias; /* alias from p->aliases */
723 struct protoent *p;
724
725 /*
726 * Try to find the name in the list of "well-known" names. If that
727 * fails, check if name is an alias for an Internet protocol.
728 */
729 if ((tp = knownname(name)) != NULL)
730 return (tp);
731
732 setprotoent(1); /* make protocol lookup cheaper */
733 while ((p = getprotoent()) != NULL) {
734 /* assert: name not same as p->name */
735 for (alias = p->p_aliases; *alias; alias++)
736 if (strcmp(name, *alias) == 0) {
737 endprotoent();
738 return (knownname(p->p_name));
739 }
740 }
741 endprotoent();
742 return (NULL);
743}
744
745static void
746usage(void)
747{
748 (void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
b06a5e2a 749"usage: netstat [-AaLnSW] [-c cpu] [-f protocol_family | -p protocol]\n"
984263bc
MD
750" [-M core] [-N system]",
751" netstat -i | -I interface [-abdnt] [-f address_family]\n"
752" [-M core] [-N system]",
753" netstat -w wait [-I interface] [-d] [-M core] [-N system]",
754" netstat -s [-s] [-z] [-f protocol_family | -p protocol] [-M core]",
755" netstat -i | -I interface -s [-f protocol_family | -p protocol]\n"
756" [-M core] [-N system]",
757" netstat -m [-M core] [-N system]",
758" netstat -r [-AanW] [-f address_family] [-M core] [-N system]",
759" netstat -rs [-s] [-M core] [-N system]",
760" netstat -g [-W] [-f address_family] [-M core] [-N system]",
761" netstat -gs [-s] [-f address_family] [-M core] [-N system]");
762 exit(1);
763}