1 /* $NetBSD: ndp.c,v 1.60 2023/08/18 13:07:38 tnn Exp $ */
2 /* $KAME: ndp.c,v 1.121 2005/07/13 11:30:13 keiichi Exp $ */
3
4 /*
5 * Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32 /*
33 * Copyright (c) 1984, 1993
34 * The Regents of the University of California. All rights reserved.
35 *
36 * This code is derived from software contributed to Berkeley by
37 * Sun Microsystems, Inc.
38 *
39 * Redistribution and use in source and binary forms, with or without
40 * modification, are permitted provided that the following conditions
41 * are met:
42 * 1. Redistributions of source code must retain the above copyright
43 * notice, this list of conditions and the following disclaimer.
44 * 2. Redistributions in binary form must reproduce the above copyright
45 * notice, this list of conditions and the following disclaimer in the
46 * documentation and/or other materials provided with the distribution.
47 * 3. Neither the name of the University nor the names of its contributors
48 * may be used to endorse or promote products derived from this software
49 * without specific prior written permission.
50 *
51 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
52 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
53 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
54 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
55 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
56 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
57 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
59 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
60 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
61 * SUCH DAMAGE.
62 */
63
64 /*
65 * Copyright (c) 1997
66 * The Regents of the University of California. All rights reserved.
67 *
68 * Redistribution and use in source and binary forms, with or without
69 * modification, are permitted provided that: (1) source code distributions
70 * retain the above copyright notice and this paragraph in its entirety, (2)
71 * distributions including binary code include the above copyright notice and
72 * this paragraph in its entirety in the documentation or other materials
73 * provided with the distribution, and (3) all advertising materials mentioning
74 * features or use of this software display the following acknowledgement:
75 * ``This product includes software developed by the University of California,
76 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
77 * the University nor the names of its contributors may be used to endorse
78 * or promote products derived from this software without specific prior
79 * written permission.
80 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
81 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
82 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
83 */
84
85 /*
86 * Based on:
87 * "@(#) Copyright (c) 1984, 1993\n\
88 * The Regents of the University of California. All rights reserved.\n";
89 *
90 * "@(#)arp.c 8.2 (Berkeley) 1/2/94";
91 */
92
93 /*
94 * ndp - display, set, delete and flush neighbor cache
95 */
96
97
98 #include <sys/param.h>
99 #include <sys/file.h>
100 #include <sys/ioctl.h>
101 #include <sys/socket.h>
102 #include <sys/sysctl.h>
103 #include <sys/time.h>
104
105 #include <net/if.h>
106 #include <net/if_dl.h>
107 #include <net/if_types.h>
108 #include <net/route.h>
109
110 #include <netinet/in.h>
111
112 #include <netinet/icmp6.h>
113 #include <netinet6/in6_var.h>
114 #include <netinet6/nd6.h>
115
116 #include <arpa/inet.h>
117
118 #include <netdb.h>
119 #include <errno.h>
120 #include <nlist.h>
121 #include <stdio.h>
122 #include <string.h>
123 #include <paths.h>
124 #include <err.h>
125 #include <stdlib.h>
126 #include <fcntl.h>
127 #include <unistd.h>
128
129 #include "prog_ops.h"
130
131 static pid_t pid;
132 static int nflag;
133 static int tflag;
134 static int32_t thiszone; /* time difference with gmt */
135 static int my_s = -1;
136 static unsigned int repeat = 0;
137
138
139 static char host_buf[NI_MAXHOST]; /* getnameinfo() */
140 static char ifix_buf[IFNAMSIZ]; /* if_indextoname() */
141
142 static void getsocket(void);
143 static int set(int, char **);
144 static void get(char *);
145 static int delete(struct rt_msghdr *, char *);
146 static void delete_one(char *);
147 static void do_foreach(struct in6_addr *, char *, int);
148 static struct in6_nbrinfo *getnbrinfo(struct in6_addr *, unsigned int, int);
149 static char *ether_str(struct sockaddr_dl *);
150 static int ndp_ether_aton(char *, u_char *);
151 __dead static void usage(void);
152 static int rtmsg(int, struct rt_msghdr *);
153 static void ifinfo(char *, int, char **);
154 static const char *sec2str(time_t);
155 static char *ether_str(struct sockaddr_dl *);
156 static void ts_print(const struct timeval *);
157 static int32_t gmt2local(time_t t);
158
159 #define NDP_F_CLEAR 1
160 #define NDP_F_DELETE 2
161
162 static int mode = 0;
163 static char *arg = NULL;
164
165 int
main(int argc,char ** argv)166 main(int argc, char **argv)
167 {
168 int ch;
169
170 while ((ch = getopt(argc, argv, "acd:f:i:nstA:")) != -1)
171 switch (ch) {
172 case 'a':
173 case 'c':
174 case 's':
175 case 'd':
176 case 'f':
177 case 'i' :
178 if (mode) {
179 usage();
180 /*NOTREACHED*/
181 }
182 mode = ch;
183 arg = optarg;
184 break;
185 case 'n':
186 nflag = 1;
187 break;
188 case 't':
189 tflag = 1;
190 break;
191 case 'A':
192 if (mode) {
193 usage();
194 /*NOTREACHED*/
195 }
196 mode = 'a';
197 repeat = atoi(optarg);
198 break;
199 default:
200 usage();
201 }
202
203 argc -= optind;
204 argv += optind;
205
206 if (prog_init && prog_init() == -1)
207 err(1, "init failed");
208
209 pid = prog_getpid();
210 thiszone = gmt2local(0L);
211
212 switch (mode) {
213 case 'a':
214 case 'c':
215 if (argc != 0) {
216 usage();
217 /*NOTREACHED*/
218 }
219 do_foreach(0, NULL, mode == 'c' ? NDP_F_CLEAR : 0);
220 break;
221 case 'd':
222 if (argc != 0) {
223 usage();
224 /*NOTREACHED*/
225 }
226 delete_one(arg);
227 break;
228 case 'i':
229 ifinfo(arg, argc, argv);
230 break;
231 case 's':
232 if (argc < 2 || argc > 4)
233 usage();
234 return(set(argc, argv) ? 1 : 0);
235 case 0:
236 if (argc != 1) {
237 usage();
238 /*NOTREACHED*/
239 }
240 get(argv[0]);
241 break;
242 }
243 return(0);
244 }
245
246 static void
makeaddr(struct sockaddr_in6 * mysin,const void * resp)247 makeaddr(struct sockaddr_in6 *mysin, const void *resp)
248 {
249 const struct sockaddr_in6 *res = resp;
250 mysin->sin6_addr = res->sin6_addr;
251 mysin->sin6_scope_id = res->sin6_scope_id;
252 inet6_putscopeid(mysin, INET6_IS_ADDR_LINKLOCAL);
253 }
254
255 static void
getsocket(void)256 getsocket(void)
257 {
258 if (my_s < 0) {
259 my_s = prog_socket(PF_ROUTE, SOCK_RAW, 0);
260 if (my_s < 0)
261 err(1, "socket");
262 }
263 }
264
265 #ifdef notdef
266 static struct sockaddr_in6 so_mask = {
267 .sin6_len = sizeof(so_mask),
268 .sin6_family = AF_INET6
269 };
270 #endif
271 static struct sockaddr_in6 blank_sin = {
272 .sin6_len = sizeof(blank_sin),
273 .sin6_family = AF_INET6
274 };
275 static struct sockaddr_in6 sin_m;
276 static struct sockaddr_dl blank_sdl = {
277 .sdl_len = sizeof(blank_sdl),
278 .sdl_family = AF_LINK,
279 };
280 static struct sockaddr_dl sdl_m;
281 static int expire_time, flags, found_entry;
282 static struct {
283 struct rt_msghdr m_rtm;
284 char m_space[512];
285 } m_rtmsg;
286
287 /*
288 * Set an individual neighbor cache entry
289 */
290 static int
set(int argc,char ** argv)291 set(int argc, char **argv)
292 {
293 register struct sockaddr_in6 *mysin = &sin_m;
294 register struct sockaddr_dl *sdl;
295 register struct rt_msghdr *rtm = &(m_rtmsg.m_rtm);
296 struct addrinfo hints, *res;
297 int gai_error;
298 u_char *ea;
299 char *host = argv[0], *eaddr = argv[1];
300
301 getsocket();
302 argc -= 2;
303 argv += 2;
304 sdl_m = blank_sdl;
305 sin_m = blank_sin;
306
307 (void)memset(&hints, 0, sizeof(hints));
308 hints.ai_family = AF_INET6;
309 gai_error = getaddrinfo(host, NULL, &hints, &res);
310 if (gai_error) {
311 warnx("%s: %s", host, gai_strerror(gai_error));
312 return 1;
313 }
314 makeaddr(mysin, res->ai_addr);
315 freeaddrinfo(res);
316 ea = (u_char *)LLADDR(&sdl_m);
317 if (ndp_ether_aton(eaddr, ea) == 0)
318 sdl_m.sdl_alen = 6;
319 flags = expire_time = 0;
320 while (argc-- > 0) {
321 if (strncmp(argv[0], "temp", 4) == 0) {
322 struct timeval tim;
323
324 (void)gettimeofday(&tim, 0);
325 expire_time = tim.tv_sec + 20 * 60;
326 } else if (strncmp(argv[0], "proxy", 5) == 0)
327 flags |= RTF_ANNOUNCE;
328 argv++;
329 }
330 if (rtmsg(RTM_GET, NULL) < 0) {
331 errx(1, "RTM_GET(%s) failed", host);
332 /* NOTREACHED */
333 }
334 mysin = (struct sockaddr_in6 *)(void *)(rtm + 1);
335 sdl = (struct sockaddr_dl *)(void *)(RT_ROUNDUP(mysin->sin6_len) + (char *)(void *)mysin);
336 if (IN6_ARE_ADDR_EQUAL(&mysin->sin6_addr, &sin_m.sin6_addr)) {
337 if (sdl->sdl_family == AF_LINK &&
338 !(rtm->rtm_flags & RTF_GATEWAY)) {
339 switch (sdl->sdl_type) {
340 case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023:
341 case IFT_ISO88024: case IFT_ISO88025:
342 goto overwrite;
343 }
344 }
345 /*
346 * IPv4 arp command retries with sin_other = SIN_PROXY here.
347 */
348 (void)fprintf(stderr, "set: cannot configure a new entry\n");
349 return 1;
350 }
351
352 overwrite:
353 if (sdl->sdl_family != AF_LINK) {
354 warnx("cannot intuit interface index and type for %s", host);
355 return (1);
356 }
357 sdl_m.sdl_type = sdl->sdl_type;
358 sdl_m.sdl_index = sdl->sdl_index;
359 return (rtmsg(RTM_ADD, NULL));
360 }
361
362 /*
363 * Display an individual neighbor cache entry
364 */
365 static void
get(char * host)366 get(char *host)
367 {
368 struct sockaddr_in6 *mysin = &sin_m;
369 struct addrinfo hints, *res;
370 int gai_error;
371
372 sin_m = blank_sin;
373 (void)memset(&hints, 0, sizeof(hints));
374 hints.ai_family = AF_INET6;
375 gai_error = getaddrinfo(host, NULL, &hints, &res);
376 if (gai_error) {
377 warnx("%s: %s", host, gai_strerror(gai_error));
378 return;
379 }
380 makeaddr(mysin, res->ai_addr);
381 freeaddrinfo(res);
382 do_foreach(&mysin->sin6_addr, host, 0);
383 if (found_entry == 0) {
384 (void)getnameinfo((struct sockaddr *)(void *)mysin,
385 (socklen_t)mysin->sin6_len,
386 host_buf, sizeof(host_buf), NULL ,0,
387 (nflag ? NI_NUMERICHOST : 0));
388 errx(1, "%s (%s) -- no entry", host, host_buf);
389 }
390 }
391
392 static void
delete_one(char * host)393 delete_one(char *host)
394 {
395 struct sockaddr_in6 *mysin = &sin_m;
396 struct addrinfo hints, *res;
397 int gai_error;
398
399 sin_m = blank_sin;
400 (void)memset(&hints, 0, sizeof(hints));
401 hints.ai_family = AF_INET6;
402 gai_error = getaddrinfo(host, NULL, &hints, &res);
403 if (gai_error) {
404 warnx("%s: %s", host, gai_strerror(gai_error));
405 return;
406 }
407 makeaddr(mysin, res->ai_addr);
408 freeaddrinfo(res);
409 do_foreach(&mysin->sin6_addr, host, NDP_F_DELETE);
410 }
411
412 /*
413 * Delete a neighbor cache entry
414 */
415 static int
delete(struct rt_msghdr * rtm,char * host)416 delete(struct rt_msghdr *rtm, char *host)
417 {
418 char delete_host_buf[NI_MAXHOST];
419 struct sockaddr_in6 *mysin = &sin_m;
420 struct sockaddr_dl *sdl;
421
422 getsocket();
423 mysin = (struct sockaddr_in6 *)(void *)(rtm + 1);
424 sdl = (struct sockaddr_dl *)(void *)(RT_ROUNDUP(mysin->sin6_len) +
425 (char *)(void *)mysin);
426
427 if (sdl->sdl_family != AF_LINK) {
428 (void)printf("cannot locate %s\n", host);
429 return (1);
430 }
431 if (rtmsg(RTM_DELETE, rtm) == 0) {
432 struct sockaddr_in6 s6 = *mysin; /* XXX: for safety */
433
434 s6.sin6_scope_id = 0;
435 inet6_putscopeid(&s6, INET6_IS_ADDR_LINKLOCAL);
436 (void)getnameinfo((struct sockaddr *)(void *)&s6,
437 (socklen_t)s6.sin6_len, delete_host_buf,
438 sizeof(delete_host_buf), NULL, 0,
439 (nflag ? NI_NUMERICHOST : 0));
440 (void)printf("%s (%s) deleted\n", host, delete_host_buf);
441 }
442
443 return 0;
444 }
445
446 #define W_ADDR (8 * 4 + 7)
447 #define W_LL 17
448 #define W_IF 6
449
450 /*
451 * Iterate on neighbor caches and do
452 * - dump all caches,
453 * - clear all caches (NDP_F_CLEAR) or
454 * - remove matched caches (NDP_F_DELETE)
455 */
456 static void
do_foreach(struct in6_addr * addr,char * host,int _flags)457 do_foreach(struct in6_addr *addr, char *host, int _flags)
458 {
459 int mib[6];
460 size_t needed;
461 char *lim, *buf, *next;
462 struct rt_msghdr *rtm;
463 struct sockaddr_in6 *mysin;
464 struct sockaddr_dl *sdl;
465 struct in6_nbrinfo *nbi;
466 struct timeval tim;
467 int addrwidth;
468 int llwidth;
469 int ifwidth;
470 char flgbuf[8], *fl;
471 const char *ifname;
472 int cflag = _flags == NDP_F_CLEAR;
473 int dflag = _flags == NDP_F_DELETE;
474
475 /* Print header */
476 if (!tflag && !cflag)
477 (void)printf("%-*.*s %-*.*s %*.*s %-9.9s %1s %2s\n",
478 W_ADDR, W_ADDR, "Neighbor", W_LL, W_LL, "Linklayer Address",
479 W_IF, W_IF, "Netif", "Expire", "S", "Fl");
480
481 again:;
482 mib[0] = CTL_NET;
483 mib[1] = PF_ROUTE;
484 mib[2] = 0;
485 mib[3] = AF_INET6;
486 mib[4] = NET_RT_FLAGS;
487 mib[5] = RTF_LLDATA;
488 if (prog_sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
489 err(1, "sysctl(PF_ROUTE estimate)");
490 if (needed > 0) {
491 if ((buf = malloc(needed)) == NULL)
492 err(1, "malloc");
493 if (prog_sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
494 free(buf);
495 if (errno == ENOBUFS)
496 goto again;
497 err(1, "sysctl(PF_ROUTE, NET_RT_FLAGS)");
498 }
499 lim = buf + needed;
500 } else
501 buf = lim = NULL;
502
503 for (next = buf; next && next < lim; next += rtm->rtm_msglen) {
504 int isrouter = 0, prbs = 0;
505
506 rtm = (struct rt_msghdr *)(void *)next;
507 mysin = (struct sockaddr_in6 *)(void *)(rtm + 1);
508 sdl = (struct sockaddr_dl *)(void *)((char *)(void *)mysin + RT_ROUNDUP(mysin->sin6_len));
509
510 /*
511 * Some OSes can produce a route that has the LINK flag but
512 * has a non-AF_LINK gateway (e.g. fe80::xx%lo0 on FreeBSD
513 * and BSD/OS, where xx is not the interface identifier on
514 * lo0). Such routes entry would annoy getnbrinfo() below,
515 * so we skip them.
516 * XXX: such routes should have the GATEWAY flag, not the
517 * LINK flag. However, there is rotten routing software
518 * that advertises all routes that have the GATEWAY flag.
519 * Thus, KAME kernel intentionally does not set the LINK flag.
520 * What is to be fixed is not ndp, but such routing software
521 * (and the kernel workaround)...
522 */
523 if (sdl->sdl_family != AF_LINK)
524 continue;
525
526 if (!(rtm->rtm_flags & RTF_HOST))
527 continue;
528
529 if (addr) {
530 if (!IN6_ARE_ADDR_EQUAL(addr, &mysin->sin6_addr))
531 continue;
532 found_entry = 1;
533 } else if (IN6_IS_ADDR_MULTICAST(&mysin->sin6_addr))
534 continue;
535 if (dflag) {
536 (void)delete(rtm, host_buf);
537 continue;
538 }
539 if (IN6_IS_ADDR_LINKLOCAL(&mysin->sin6_addr) ||
540 IN6_IS_ADDR_MC_LINKLOCAL(&mysin->sin6_addr)) {
541 uint16_t scopeid = mysin->sin6_scope_id;
542 inet6_getscopeid(mysin, INET6_IS_ADDR_LINKLOCAL|
543 INET6_IS_ADDR_MC_LINKLOCAL);
544 if (scopeid == 0)
545 mysin->sin6_scope_id = sdl->sdl_index;
546 }
547 (void)getnameinfo((struct sockaddr *)(void *)mysin,
548 (socklen_t)mysin->sin6_len,
549 host_buf, sizeof(host_buf), NULL, 0,
550 (nflag ? NI_NUMERICHOST : 0));
551 if (cflag) {
552 /* Restore scopeid */
553 if (IN6_IS_ADDR_LINKLOCAL(&mysin->sin6_addr) ||
554 IN6_IS_ADDR_MC_LINKLOCAL(&mysin->sin6_addr))
555 inet6_putscopeid(mysin, INET6_IS_ADDR_LINKLOCAL|
556 INET6_IS_ADDR_MC_LINKLOCAL);
557 if ((rtm->rtm_flags & RTF_STATIC) == 0)
558 (void)delete(rtm, host_buf);
559 continue;
560 }
561 (void)gettimeofday(&tim, 0);
562 if (tflag)
563 ts_print(&tim);
564
565 addrwidth = strlen(host_buf);
566 if (addrwidth < W_ADDR)
567 addrwidth = W_ADDR;
568 llwidth = strlen(ether_str(sdl));
569 if (W_ADDR + W_LL - addrwidth > llwidth)
570 llwidth = W_ADDR + W_LL - addrwidth;
571 ifname = if_indextoname((unsigned int)sdl->sdl_index, ifix_buf);
572 if (!ifname)
573 ifname = "?";
574 ifwidth = strlen(ifname);
575 if (W_ADDR + W_LL + W_IF - addrwidth - llwidth > ifwidth)
576 ifwidth = W_ADDR + W_LL + W_IF - addrwidth - llwidth;
577
578 (void)printf("%-*.*s %-*.*s %*.*s", addrwidth, addrwidth,
579 host_buf, llwidth, llwidth, ether_str(sdl), ifwidth,
580 ifwidth, ifname);
581
582 /* Print neighbor discovery specific informations */
583 nbi = getnbrinfo(&mysin->sin6_addr,
584 (unsigned int)sdl->sdl_index, 1);
585 if (nbi) {
586 if (nbi->expire > tim.tv_sec) {
587 (void)printf(" %-9.9s",
588 sec2str(nbi->expire - tim.tv_sec));
589 } else if (nbi->expire == 0)
590 (void)printf(" %-9.9s", "permanent");
591 else
592 (void)printf(" %-9.9s", "expired");
593
594 switch (nbi->state) {
595 case ND_LLINFO_NOSTATE:
596 (void)printf(" N");
597 break;
598 case ND_LLINFO_WAITDELETE:
599 (void)printf(" W");
600 break;
601 case ND_LLINFO_INCOMPLETE:
602 (void)printf(" I");
603 break;
604 case ND_LLINFO_REACHABLE:
605 (void)printf(" R");
606 break;
607 case ND_LLINFO_STALE:
608 (void)printf(" S");
609 break;
610 case ND_LLINFO_DELAY:
611 (void)printf(" D");
612 break;
613 case ND_LLINFO_PROBE:
614 (void)printf(" P");
615 break;
616 case ND_LLINFO_UNREACHABLE:
617 (void)printf(" U");
618 break;
619 default:
620 (void)printf(" ?");
621 break;
622 }
623
624 isrouter = nbi->isrouter;
625 prbs = nbi->asked;
626 } else {
627 warnx("failed to get neighbor information");
628 (void)printf(" ");
629 }
630
631 /*
632 * other flags. R: router, P: proxy, W: ??
633 */
634 fl = flgbuf;
635 if (isrouter)
636 *fl++ = 'R';
637 if (rtm->rtm_flags & RTF_ANNOUNCE)
638 *fl++ = 'p';
639 *fl++ = '\0';
640 (void)printf(" %s", flgbuf);
641
642 if (prbs)
643 (void)printf(" %d", prbs);
644
645 (void)printf("\n");
646 }
647 if (buf != NULL)
648 free(buf);
649
650 if (repeat) {
651 (void)printf("\n");
652 (void)fflush(stdout);
653 (void)sleep(repeat);
654 goto again;
655 }
656 }
657
658 static struct in6_nbrinfo *
getnbrinfo(struct in6_addr * addr,unsigned int ifindex,int warning)659 getnbrinfo(struct in6_addr *addr, unsigned int ifindex, int warning)
660 {
661 static struct in6_nbrinfo nbi;
662 int s;
663
664 if ((s = prog_socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
665 err(1, "socket");
666
667 (void)memset(&nbi, 0, sizeof(nbi));
668 (void)if_indextoname(ifindex, nbi.ifname);
669 nbi.addr = *addr;
670 if (prog_ioctl(s, SIOCGNBRINFO_IN6, &nbi) < 0) {
671 if (warning)
672 warn("ioctl(SIOCGNBRINFO_IN6)");
673 (void)prog_close(s);
674 return(NULL);
675 }
676
677 (void)prog_close(s);
678 return(&nbi);
679 }
680
681 static char *
ether_str(struct sockaddr_dl * sdl)682 ether_str(struct sockaddr_dl *sdl)
683 {
684 static char hbuf[NI_MAXHOST];
685
686 if (sdl->sdl_alen) {
687 if (getnameinfo((struct sockaddr *)(void *)sdl,
688 (socklen_t)sdl->sdl_len,
689 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
690 (void)snprintf(hbuf, sizeof(hbuf), "<invalid>");
691 } else
692 (void)snprintf(hbuf, sizeof(hbuf), "(incomplete)");
693
694 return(hbuf);
695 }
696
697 static int
ndp_ether_aton(char * a,u_char * n)698 ndp_ether_aton(char *a, u_char *n)
699 {
700 int i, o[6];
701
702 i = sscanf(a, "%x:%x:%x:%x:%x:%x", &o[0], &o[1], &o[2],
703 &o[3], &o[4], &o[5]);
704 if (i != 6) {
705 warnx("invalid Ethernet address '%s'", a);
706 return (1);
707 }
708 for (i = 0; i < 6; i++)
709 n[i] = o[i];
710 return (0);
711 }
712
713 static void
usage(void)714 usage(void)
715 {
716 const char *pn = getprogname();
717
718 (void)fprintf(stderr, "Usage: %s [-nt] hostname\n", pn);
719 (void)fprintf(stderr,
720 " %s [-nt] -a | -c\n", pn);
721 (void)fprintf(stderr, " %s [-nt] -A wait\n", pn);
722 (void)fprintf(stderr, " %s [-nt] -d hostname\n", pn);
723 (void)fprintf(stderr, " %s [-nt] -f filename\n", pn);
724 (void)fprintf(stderr, " %s [-nt] -i interface [flags...]\n", pn);
725 (void)fprintf(stderr,
726 " %s [-nt] -s nodename etheraddr [temp] [proxy]\n", pn);
727 exit(1);
728 }
729
730 static int
rtmsg(int cmd,struct rt_msghdr * _rtm)731 rtmsg(int cmd, struct rt_msghdr *_rtm)
732 {
733 static int seq;
734 register struct rt_msghdr *rtm = _rtm;
735 register char *cp = m_rtmsg.m_space;
736 register int l;
737
738 errno = 0;
739 if (rtm != NULL) {
740 memcpy(&m_rtmsg, rtm, rtm->rtm_msglen);
741 rtm = &m_rtmsg.m_rtm;
742 goto doit;
743 }
744 (void)memset(&m_rtmsg, 0, sizeof(m_rtmsg));
745 rtm = &m_rtmsg.m_rtm;
746 rtm->rtm_flags = flags;
747 rtm->rtm_version = RTM_VERSION;
748
749 switch (cmd) {
750 default:
751 errx(1, "internal wrong cmd");
752 /*NOTREACHED*/
753 case RTM_ADD:
754 rtm->rtm_addrs |= RTA_GATEWAY;
755 if (expire_time) {
756 rtm->rtm_rmx.rmx_expire = expire_time;
757 rtm->rtm_inits = RTV_EXPIRE;
758 }
759 rtm->rtm_flags |= (RTF_HOST | RTF_STATIC | RTF_LLDATA);
760 #ifdef notdef /* we don't support ipv6addr/128 type proxying. */
761 if (rtm->rtm_flags & RTF_ANNOUNCE) {
762 rtm->rtm_flags &= ~RTF_HOST;
763 rtm->rtm_addrs |= RTA_NETMASK;
764 }
765 #endif
766 rtm->rtm_addrs |= RTA_DST;
767 break;
768 case RTM_GET:
769 rtm->rtm_flags |= RTF_LLDATA;
770 rtm->rtm_addrs |= RTA_DST | RTA_GATEWAY;
771 }
772 #define NEXTADDR(w, s) \
773 if (rtm->rtm_addrs & (w)) { \
774 (void)memcpy(cp, &s, sizeof(s)); \
775 RT_ADVANCE(cp, (struct sockaddr *)(void *)&s); \
776 }
777
778 NEXTADDR(RTA_DST, sin_m);
779 NEXTADDR(RTA_GATEWAY, sdl_m);
780 #ifdef notdef /* we don't support ipv6addr/128 type proxying. */
781 (void)memset(&so_mask.sin6_addr, 0xff, sizeof(so_mask.sin6_addr));
782 NEXTADDR(RTA_NETMASK, so_mask);
783 #endif
784
785 rtm->rtm_msglen = cp - (char *)(void *)&m_rtmsg;
786 doit:
787 l = rtm->rtm_msglen;
788 rtm->rtm_seq = ++seq;
789 rtm->rtm_type = cmd;
790 if (prog_write(my_s, &m_rtmsg, (size_t)l) == -1) {
791 if (errno != ESRCH || cmd != RTM_DELETE)
792 err(1, "writing to routing socket");
793 }
794 do {
795 l = prog_read(my_s, &m_rtmsg, sizeof(m_rtmsg));
796 } while (l > 0 && (rtm->rtm_seq != seq || rtm->rtm_pid != pid));
797 if (l < 0)
798 warn("read from routing socket");
799 return (0);
800 }
801
802 static void
ifinfo(char * ifname,int argc,char ** argv)803 ifinfo(char *ifname, int argc, char **argv)
804 {
805 struct in6_ndireq nd;
806 int i, s;
807 u_int32_t newflags;
808 bool valset = false, flagset = false;
809
810 if ((s = prog_socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
811 err(1, "socket");
812 (void)memset(&nd, 0, sizeof(nd));
813 (void)strlcpy(nd.ifname, ifname, sizeof(nd.ifname));
814 if (prog_ioctl(s, SIOCGIFINFO_IN6, &nd) < 0)
815 err(1, "ioctl(SIOCGIFINFO_IN6)");
816 #define ND nd.ndi
817 newflags = ND.flags;
818 for (i = 0; i < argc; i++) {
819 int clear = 0;
820 char *cp = argv[i];
821
822 if (*cp == '-') {
823 clear = 1;
824 cp++;
825 }
826
827 #define SETFLAG(s, f) \
828 do {\
829 if (strcmp(cp, (s)) == 0) {\
830 if (clear)\
831 newflags &= ~(f);\
832 else\
833 newflags |= (f);\
834 flagset = true; \
835 }\
836 } while (0)
837 /*
838 * XXX: this macro is not 100% correct, in that it matches "nud" against
839 * "nudbogus". But we just let it go since this is minor.
840 */
841 #define SETVALUE(f, v) \
842 do { \
843 char *valptr; \
844 unsigned long newval; \
845 v = 0; /* unspecified */ \
846 if (strncmp(cp, f, strlen(f)) == 0) { \
847 valptr = strchr(cp, '='); \
848 if (valptr == NULL) \
849 err(1, "syntax error in %s field", (f)); \
850 errno = 0; \
851 newval = strtoul(++valptr, NULL, 0); \
852 if (errno) \
853 err(1, "syntax error in %s's value", (f)); \
854 v = newval; \
855 valset = true; \
856 } \
857 } while (0)
858
859 #ifdef ND6_IFF_IFDISABLED
860 SETFLAG("disabled", ND6_IFF_IFDISABLED);
861 #endif
862 SETFLAG("nud", ND6_IFF_PERFORMNUD);
863 #ifdef ND6_IFF_ACCEPT_RTADV
864 SETFLAG("accept_rtadv", ND6_IFF_ACCEPT_RTADV);
865 #endif
866 #ifdef ND6_IFF_OVERRIDE_RTADV
867 SETFLAG("override_rtadv", ND6_IFF_OVERRIDE_RTADV);
868 #endif
869 #ifdef ND6_IFF_AUTO_LINKLOCAL
870 SETFLAG("auto_linklocal", ND6_IFF_AUTO_LINKLOCAL);
871 #endif
872 #ifdef ND6_IFF_PREFER_SOURCE
873 SETFLAG("prefer_source", ND6_IFF_PREFER_SOURCE);
874 #endif
875 #ifdef ND6_IFF_DONT_SET_IFROUTE
876 SETFLAG("dont_set_ifroute", ND6_IFF_DONT_SET_IFROUTE);
877 #endif
878 SETVALUE("basereachable", ND.basereachable);
879 SETVALUE("retrans", ND.retrans);
880 SETVALUE("curhlim", ND.chlim);
881
882 ND.flags = newflags;
883 #ifdef SIOCSIFINFO_IN6
884 if (valset && prog_ioctl(s, SIOCSIFINFO_IN6, &nd) < 0)
885 err(1, "ioctl(SIOCSIFINFO_IN6)");
886 #endif
887 if (flagset && prog_ioctl(s, SIOCSIFINFO_FLAGS, &nd) < 0)
888 err(1, "ioctl(SIOCSIFINFO_FLAGS)");
889 #undef SETFLAG
890 #undef SETVALUE
891 }
892
893 if (prog_ioctl(s, SIOCGIFINFO_IN6, &nd) < 0)
894 err(1, "ioctl(SIOCGIFINFO_IN6)");
895 (void)printf("curhlim=%d", ND.chlim);
896 (void)printf(", basereachable=%ds%dms",
897 ND.basereachable / 1000, ND.basereachable % 1000);
898 (void)printf(", retrans=%ds%dms", ND.retrans / 1000, ND.retrans % 1000);
899 if (ND.flags) {
900 (void)printf("\nFlags: ");
901 if ((ND.flags & ND6_IFF_PERFORMNUD))
902 (void)printf("nud ");
903 #ifdef ND6_IFF_IFDISABLED
904 if ((ND.flags & ND6_IFF_IFDISABLED))
905 (void)printf("disabled ");
906 #endif
907 #ifdef ND6_IFF_AUTO_LINKLOCAL
908 if ((ND.flags & ND6_IFF_AUTO_LINKLOCAL))
909 (void)printf("auto_linklocal ");
910 #endif
911 #ifdef ND6_IFF_PREFER_SOURCE
912 if ((ND.flags & ND6_IFF_PREFER_SOURCE))
913 (void)printf("prefer_source ");
914 #endif
915 }
916 (void)putc('\n', stdout);
917 #undef ND
918
919 (void)prog_close(s);
920 }
921
922 static const char *
sec2str(time_t total)923 sec2str(time_t total)
924 {
925 static char result[256];
926 int days, hours, mins, secs;
927 int first = 1;
928 char *p = result;
929 char *ep = &result[sizeof(result)];
930 int n;
931
932 days = total / 3600 / 24;
933 hours = (total / 3600) % 24;
934 mins = (total / 60) % 60;
935 secs = total % 60;
936
937 if (days) {
938 first = 0;
939 n = snprintf(p, (size_t)(ep - p), "%dd", days);
940 if (n < 0 || n >= ep - p)
941 return "?";
942 p += n;
943 }
944 if (!first || hours) {
945 first = 0;
946 n = snprintf(p, (size_t)(ep - p), "%dh", hours);
947 if (n < 0 || n >= ep - p)
948 return "?";
949 p += n;
950 }
951 if (!first || mins) {
952 first = 0;
953 n = snprintf(p, (size_t)(ep - p), "%dm", mins);
954 if (n < 0 || n >= ep - p)
955 return "?";
956 p += n;
957 }
958 (void)snprintf(p, (size_t)(ep - p), "%ds", secs);
959
960 return(result);
961 }
962
963 /*
964 * Print the timestamp
965 * from tcpdump/util.c
966 */
967 static void
ts_print(const struct timeval * tvp)968 ts_print(const struct timeval *tvp)
969 {
970 int s;
971
972 /* Default */
973 s = (tvp->tv_sec + thiszone) % 86400;
974 (void)printf("%02d:%02d:%02d.%06u ",
975 s / 3600, (s % 3600) / 60, s % 60, (u_int32_t)tvp->tv_usec);
976 }
977
978 /*
979 * Returns the difference between gmt and local time in seconds.
980 * Use gmtime() and localtime() to keep things simple.
981 */
982 static int32_t
gmt2local(time_t t)983 gmt2local(time_t t)
984 {
985 int dt, dir;
986 struct tm *gmt, *loc;
987 struct tm sgmt;
988
989 if (t == 0)
990 t = time(NULL);
991 gmt = &sgmt;
992 *gmt = *gmtime(&t);
993 loc = localtime(&t);
994 dt = (loc->tm_hour - gmt->tm_hour) * 60 * 60 +
995 (loc->tm_min - gmt->tm_min) * 60;
996
997 /*
998 * If the year or julian day is different, we span 00:00 GMT
999 * and must add or subtract a day. Check the year first to
1000 * avoid problems when the julian day wraps.
1001 */
1002 dir = loc->tm_year - gmt->tm_year;
1003 if (dir == 0)
1004 dir = loc->tm_yday - gmt->tm_yday;
1005 dt += dir * 24 * 60 * 60;
1006
1007 return (dt);
1008 }
1009