1 /* $OpenBSD: ndp.c,v 1.109 2023/04/05 13:56:41 bluhm Exp $ */
2 /* $KAME: ndp.c,v 1.101 2002/07/17 08:46:33 itojun 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 * Based on:
66 * "@(#) Copyright (c) 1984, 1993\n\
67 * The Regents of the University of California. All rights reserved.\n";
68 *
69 * "@(#)arp.c 8.2 (Berkeley) 1/2/94";
70 */
71
72 /*
73 * ndp - display, set, delete and flush neighbor cache
74 */
75
76
77 #include <sys/ioctl.h>
78 #include <sys/socket.h>
79 #include <sys/sysctl.h>
80 #include <sys/time.h>
81 #include <sys/queue.h>
82
83 #include <net/if.h>
84 #include <net/if_dl.h>
85 #include <net/if_types.h>
86 #include <net/route.h>
87
88 #include <netinet/in.h>
89
90 #include <netinet/icmp6.h>
91 #include <netinet6/in6_var.h>
92 #include <netinet6/nd6.h>
93
94 #include <arpa/inet.h>
95
96 #include <stdio.h>
97 #include <errno.h>
98 #include <fcntl.h>
99 #include <netdb.h>
100 #include <stdlib.h>
101 #include <string.h>
102 #include <unistd.h>
103 #include <limits.h>
104 #include <err.h>
105
106 /* packing rule for routing socket */
107 #define ROUNDUP(a) \
108 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
109 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
110
111 static pid_t pid;
112 static int nflag;
113 static int tflag;
114 static int rtsock = -1;
115 static int repeat = 0;
116
117 char host_buf[NI_MAXHOST]; /* getnameinfo() */
118 char ifix_buf[IFNAMSIZ]; /* if_indextoname() */
119
120 int file(char *);
121 void getsocket(void);
122 int parse_host(const char *, struct sockaddr_in6 *);
123 int set(int, char **);
124 void get(const char *);
125 int delete(const char *);
126 void dump(struct sockaddr_in6 *, int);
127 static struct in6_nbrinfo *getnbrinfo(struct in6_addr *, int, int);
128 static char *ether_str(struct sockaddr_dl *);
129 int ndp_ether_aton(const char *, u_char *);
130 void usage(void);
131 int rtmsg(int);
132 int rtget(struct sockaddr_in6 **, struct sockaddr_dl **);
133 void ifinfo(const char *);
134 static char *sec2str(time_t);
135 static int rdomain;
136
137 int
main(int argc,char * argv[])138 main(int argc, char *argv[])
139 {
140 int ch, mode = 0, error = 0;
141 char *arg = NULL;
142 const char *errstr;
143
144 pid = getpid();
145 rdomain = getrtable();
146 while ((ch = getopt(argc, argv, "acd:f:i:nstA:V:")) != -1) {
147 switch (ch) {
148 case 'a':
149 case 'c':
150 case 'p':
151 case 'r':
152 case 'P':
153 case 's':
154 if (mode) {
155 usage();
156 }
157 mode = ch;
158 arg = NULL;
159 break;
160 case 'd':
161 case 'f':
162 case 'i' :
163 if (mode) {
164 usage();
165 }
166 mode = ch;
167 arg = optarg;
168 break;
169 case 'n':
170 nflag = 1;
171 break;
172 case 't':
173 tflag = 1;
174 break;
175 case 'A':
176 if (mode) {
177 usage();
178 }
179 mode = 'a';
180 repeat = strtonum(optarg, 1, INT_MAX, &errstr);
181 if (errstr) {
182 usage();
183 }
184 break;
185 case 'V':
186 rdomain = strtonum(optarg, 0, RT_TABLEID_MAX, &errstr);
187 if (errstr != NULL) {
188 warn("bad rdomain: %s", errstr);
189 usage();
190 }
191 break;
192 default:
193 usage();
194 }
195 }
196 argc -= optind;
197 argv += optind;
198
199 switch (mode) {
200 case 'a':
201 case 'c':
202 if (argc != 0) {
203 usage();
204 }
205 dump(NULL, mode == 'c');
206 break;
207 case 'd':
208 if (argc != 0) {
209 usage();
210 }
211 error = delete(arg);
212 break;
213 case 'f':
214 if (argc != 0)
215 usage();
216 file(arg);
217 break;
218 case 'i':
219 if (argc != 0)
220 usage();
221 ifinfo(arg);
222 break;
223 case 's':
224 if (argc < 2 || argc > 4)
225 usage();
226 exit(set(argc, argv) ? 1 : 0);
227 case 0:
228 if (argc != 1) {
229 usage();
230 }
231 get(argv[0]);
232 break;
233 }
234 return (error);
235 }
236
237 /*
238 * Process a file to set standard ndp entries
239 */
240 int
file(char * name)241 file(char *name)
242 {
243 FILE *fp;
244 int i, retval;
245 char line[100], arg[5][50], *args[5];
246
247 if ((fp = fopen(name, "r")) == NULL) {
248 err(1, "cannot open %s", name);
249 }
250 args[0] = &arg[0][0];
251 args[1] = &arg[1][0];
252 args[2] = &arg[2][0];
253 args[3] = &arg[3][0];
254 args[4] = &arg[4][0];
255 retval = 0;
256 while (fgets(line, sizeof(line), fp) != NULL) {
257 i = sscanf(line, "%49s %49s %49s %49s %49s",
258 arg[0], arg[1], arg[2], arg[3], arg[4]);
259 if (i < 2) {
260 warnx("bad line: %s", line);
261 retval = 1;
262 continue;
263 }
264 if (set(i, args))
265 retval = 1;
266 }
267 fclose(fp);
268 return (retval);
269 }
270
271 void
getsocket(void)272 getsocket(void)
273 {
274 socklen_t len = sizeof(rdomain);
275
276 if (rtsock >= 0)
277 return;
278 rtsock = socket(AF_ROUTE, SOCK_RAW, 0);
279 if (rtsock == -1)
280 err(1, "routing socket");
281 if (setsockopt(rtsock, AF_ROUTE, ROUTE_TABLEFILTER, &rdomain, len) == -1)
282 err(1, "ROUTE_TABLEFILTER");
283
284 if (pledge("stdio dns", NULL) == -1)
285 err(1, "pledge");
286 }
287
288 int
parse_host(const char * host,struct sockaddr_in6 * sin6)289 parse_host(const char *host, struct sockaddr_in6 *sin6)
290 {
291 struct addrinfo hints, *res;
292 int gai_error;
293
294 bzero(&hints, sizeof(hints));
295 hints.ai_family = AF_INET6;
296 if (nflag)
297 hints.ai_flags = AI_NUMERICHOST;
298
299 gai_error = getaddrinfo(host, NULL, &hints, &res);
300 if (gai_error) {
301 warnx("%s: %s", host, gai_strerror(gai_error));
302 return 1;
303 }
304 *sin6 = *(struct sockaddr_in6 *)res->ai_addr;
305 freeaddrinfo(res);
306 return 0;
307 }
308
309 struct sockaddr_in6 so_mask = {sizeof(so_mask), AF_INET6 };
310 struct sockaddr_in6 blank_sin = {sizeof(blank_sin), AF_INET6 }, sin_m;
311 struct sockaddr_dl blank_sdl = {sizeof(blank_sdl), AF_LINK }, sdl_m;
312 struct sockaddr_dl ifp_m = { sizeof(ifp_m), AF_LINK };
313 time_t expire_time;
314 int flags, found_entry;
315 struct {
316 struct rt_msghdr m_rtm;
317 char m_space[512];
318 } m_rtmsg;
319
320 /*
321 * Set an individual neighbor cache entry
322 */
323 int
set(int argc,char * argv[])324 set(int argc, char *argv[])
325 {
326 struct sockaddr_in6 *sin = &sin_m;
327 struct sockaddr_dl *sdl;
328 struct rt_msghdr *rtm = &(m_rtmsg.m_rtm);
329 u_char *ea;
330 const char *host = argv[0], *eaddr = argv[1];
331
332 getsocket();
333 argc -= 2;
334 argv += 2;
335 sdl_m = blank_sdl;
336 sin_m = blank_sin;
337
338 if (parse_host(host, sin))
339 return 1;
340 ea = (u_char *)LLADDR(&sdl_m);
341 if (ndp_ether_aton(eaddr, ea) == 0)
342 sdl_m.sdl_alen = 6;
343 expire_time = 0;
344 flags = 0;
345 while (argc-- > 0) {
346 if (strncmp(argv[0], "temp", 4) == 0) {
347 struct timeval now;
348
349 gettimeofday(&now, 0);
350 expire_time = now.tv_sec + 20 * 60;
351 } else if (strncmp(argv[0], "proxy", 5) == 0)
352 flags |= RTF_ANNOUNCE;
353 argv++;
354 }
355
356 if (rtget(&sin, &sdl)) {
357 errx(1, "RTM_GET(%s) failed", host);
358 }
359
360 if (IN6_ARE_ADDR_EQUAL(&sin->sin6_addr, &sin_m.sin6_addr) &&
361 sin->sin6_scope_id == sin_m.sin6_scope_id) {
362 if (sdl->sdl_family == AF_LINK &&
363 (rtm->rtm_flags & RTF_LLINFO) &&
364 !(rtm->rtm_flags & RTF_GATEWAY)) {
365 switch (sdl->sdl_type) {
366 case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023:
367 case IFT_ISO88024: case IFT_ISO88025:
368 goto overwrite;
369 }
370 }
371 /*
372 * IPv4 arp command retries with sin_other = SIN_PROXY here.
373 */
374 warnx("set: cannot configure a new entry");
375 return 1;
376 }
377
378 overwrite:
379 if (sdl->sdl_family != AF_LINK) {
380 printf("cannot intuit interface index and type for %s\n", host);
381 return (1);
382 }
383 sdl_m.sdl_type = sdl->sdl_type;
384 sdl_m.sdl_index = sdl->sdl_index;
385 return (rtmsg(RTM_ADD));
386 }
387
388 /*
389 * Display an individual neighbor cache entry
390 */
391 void
get(const char * host)392 get(const char *host)
393 {
394 struct sockaddr_in6 *sin = &sin_m;
395
396 sin_m = blank_sin;
397 if (parse_host(host, sin))
398 return;
399
400 dump(sin, 0);
401 if (found_entry == 0) {
402 getnameinfo((struct sockaddr *)sin, sin->sin6_len, host_buf,
403 sizeof(host_buf), NULL ,0,
404 (nflag ? NI_NUMERICHOST : 0));
405 printf("%s (%s) -- no entry\n", host, host_buf);
406 exit(1);
407 }
408 }
409
410 /*
411 * Delete a neighbor cache entry
412 */
413 int
delete(const char * host)414 delete(const char *host)
415 {
416 struct sockaddr_in6 *sin;
417 struct rt_msghdr *rtm;
418 struct sockaddr_dl *sdl;
419
420 sin = &sin_m;
421 rtm = &m_rtmsg.m_rtm;
422
423 getsocket();
424 sin_m = blank_sin; /* struct copy */
425 if (parse_host(host, sin))
426 return 1;
427 if (rtget(&sin, &sdl)) {
428 warn("%s", host);
429 return 1;
430 }
431 if (IN6_ARE_ADDR_EQUAL(&sin->sin6_addr, &sin_m.sin6_addr) &&
432 sin->sin6_scope_id == sin_m.sin6_scope_id) {
433 if (sdl->sdl_family == AF_LINK && rtm->rtm_flags & RTF_LLINFO) {
434 if (rtm->rtm_flags & RTF_LOCAL)
435 return 0;
436 if ((rtm->rtm_flags & RTF_GATEWAY) == 0)
437 goto delete;
438 }
439 }
440
441 /*
442 * IPv4 arp command retries with sin_other = SIN_PROXY here.
443 */
444 warnx("delete: cannot locate %s", host);
445 return 1;
446
447 delete:
448 if (sdl->sdl_family != AF_LINK) {
449 printf("cannot locate %s\n", host);
450 return 1;
451 }
452 if (rtmsg(RTM_DELETE))
453 return 1;
454 getnameinfo((struct sockaddr *)sin, sin->sin6_len, host_buf,
455 sizeof(host_buf), NULL, 0, (nflag ? NI_NUMERICHOST : 0));
456 printf("%s (%s) deleted\n", host, host_buf);
457 return 0;
458 }
459
460 /*
461 * strlen("2001:0db8:3333:4444:5555:6666:7777:8888") == 39
462 */
463 #define W_ADDR 39
464 #define W_LL 17
465 #define W_IF 7
466
467 /*
468 * Dump the entire neighbor cache
469 */
470 void
dump(struct sockaddr_in6 * addr,int cflag)471 dump(struct sockaddr_in6 *addr, int cflag)
472 {
473 int mib[7];
474 size_t needed;
475 char *lim, *buf = NULL, *next;
476 struct rt_msghdr *rtm;
477 struct sockaddr_in6 *sin;
478 struct sockaddr_dl *sdl;
479 struct in6_nbrinfo *nbi;
480 struct timeval now;
481 int addrwidth;
482 int llwidth;
483 int ifwidth;
484 char *ifname;
485
486 /* Print header */
487 if (!tflag && !cflag)
488 printf("%-*.*s %-*.*s %*.*s %-9.9s %1s %5s\n",
489 W_ADDR, W_ADDR, "Neighbor", W_LL, W_LL, "Linklayer Address",
490 W_IF, W_IF, "Netif", "Expire", "S", "Flags");
491
492 again:;
493 lim = NULL;
494 mib[0] = CTL_NET;
495 mib[1] = PF_ROUTE;
496 mib[2] = 0;
497 mib[3] = AF_INET6;
498 mib[4] = NET_RT_FLAGS;
499 mib[5] = RTF_LLINFO;
500 mib[6] = rdomain;
501 while (1) {
502 if (sysctl(mib, 7, NULL, &needed, NULL, 0) == -1)
503 err(1, "sysctl(PF_ROUTE estimate)");
504 if (needed == 0)
505 break;
506 if ((buf = realloc(buf, needed)) == NULL)
507 err(1, "realloc");
508 if (sysctl(mib, 7, buf, &needed, NULL, 0) == -1) {
509 if (errno == ENOMEM)
510 continue;
511 err(1, "sysctl(PF_ROUTE, NET_RT_FLAGS)");
512 }
513 lim = buf + needed;
514 break;
515 }
516
517 for (next = buf; next && lim && next < lim; next += rtm->rtm_msglen) {
518 int isrouter = 0, prbs = 0;
519
520 rtm = (struct rt_msghdr *)next;
521 if (rtm->rtm_version != RTM_VERSION)
522 continue;
523 sin = (struct sockaddr_in6 *)(next + rtm->rtm_hdrlen);
524 #ifdef __KAME__
525 {
526 struct in6_addr *in6 = &sin->sin6_addr;
527 if ((IN6_IS_ADDR_LINKLOCAL(in6) ||
528 IN6_IS_ADDR_MC_LINKLOCAL(in6) ||
529 IN6_IS_ADDR_MC_INTFACELOCAL(in6)) &&
530 sin->sin6_scope_id == 0) {
531 sin->sin6_scope_id = (u_int32_t)
532 ntohs(*(u_short *)&in6->s6_addr[2]);
533 *(u_short *)&in6->s6_addr[2] = 0;
534 }
535 }
536 #endif
537 sdl = (struct sockaddr_dl *)((char *)sin + ROUNDUP(sin->sin6_len));
538
539 /*
540 * Some OSes can produce a route that has the LINK flag but
541 * has a non-AF_LINK gateway (e.g. fe80::xx%lo0 on FreeBSD
542 * and BSD/OS, where xx is not the interface identifier on
543 * lo0). Such routes entry would annoy getnbrinfo() below,
544 * so we skip them.
545 * XXX: such routes should have the GATEWAY flag, not the
546 * LINK flag. However, there is rotten routing software
547 * that advertises all routes that have the GATEWAY flag.
548 * Thus, KAME kernel intentionally does not set the LINK flag.
549 * What is to be fixed is not ndp, but such routing software
550 * (and the kernel workaround)...
551 */
552 if (sdl->sdl_family != AF_LINK)
553 continue;
554
555 if (!(rtm->rtm_flags & RTF_HOST))
556 continue;
557
558 if (addr) {
559 if (!IN6_ARE_ADDR_EQUAL(&addr->sin6_addr,
560 &sin->sin6_addr) || addr->sin6_scope_id !=
561 sin->sin6_scope_id)
562 continue;
563 found_entry = 1;
564 } else if (IN6_IS_ADDR_MULTICAST(&sin->sin6_addr))
565 continue;
566 getnameinfo((struct sockaddr *)sin, sin->sin6_len, host_buf,
567 sizeof(host_buf), NULL, 0, (nflag ? NI_NUMERICHOST : 0));
568 if (cflag) {
569 if (rtm->rtm_flags & RTF_CLONED)
570 delete(host_buf);
571 continue;
572 }
573 gettimeofday(&now, 0);
574 if (tflag) {
575 char buf[sizeof("00:00:00")];
576 struct tm *tm;
577
578 tm = localtime(&now.tv_sec);
579 if (tm != NULL) {
580 strftime(buf, sizeof(buf), "%H:%M:%S", tm);
581 printf("%s.%06ld ", buf, now.tv_usec);
582 }
583 }
584
585 addrwidth = strlen(host_buf);
586 if (addrwidth < W_ADDR)
587 addrwidth = W_ADDR;
588 llwidth = strlen(ether_str(sdl));
589 if (W_ADDR + W_LL - addrwidth > llwidth)
590 llwidth = W_ADDR + W_LL - addrwidth;
591 ifname = if_indextoname(sdl->sdl_index, ifix_buf);
592 if (!ifname)
593 ifname = "?";
594 ifwidth = strlen(ifname);
595 if (W_ADDR + W_LL + W_IF - addrwidth - llwidth > ifwidth)
596 ifwidth = W_ADDR + W_LL + W_IF - addrwidth - llwidth;
597
598 printf("%-*.*s %-*.*s %*.*s", addrwidth, addrwidth, host_buf,
599 llwidth, llwidth, ether_str(sdl), ifwidth, ifwidth, ifname);
600
601 /* Print neighbor discovery specific information */
602 nbi = getnbrinfo(&sin->sin6_addr, sdl->sdl_index, 1);
603 if (nbi) {
604 if (nbi->expire > now.tv_sec) {
605 printf(" %-9.9s",
606 sec2str(nbi->expire - now.tv_sec));
607 } else if (nbi->expire == 0)
608 printf(" %-9.9s", "permanent");
609 else
610 printf(" %-9.9s", "expired");
611
612 switch (nbi->state) {
613 case ND6_LLINFO_NOSTATE:
614 printf(" N");
615 break;
616 case ND6_LLINFO_INCOMPLETE:
617 printf(" I");
618 break;
619 case ND6_LLINFO_REACHABLE:
620 printf(" R");
621 break;
622 case ND6_LLINFO_STALE:
623 printf(" S");
624 break;
625 case ND6_LLINFO_DELAY:
626 printf(" D");
627 break;
628 case ND6_LLINFO_PROBE:
629 printf(" P");
630 break;
631 default:
632 printf(" ?");
633 break;
634 }
635
636 isrouter = nbi->isrouter;
637 prbs = nbi->asked;
638 } else {
639 warnx("failed to get neighbor information");
640 printf(" ");
641 }
642
643 printf(" %s%s%s",
644 (rtm->rtm_flags & RTF_LOCAL) ? "l" : "",
645 isrouter ? "R" : "",
646 (rtm->rtm_flags & RTF_ANNOUNCE) ? "p" : "");
647
648 if (prbs)
649 printf(" %d", prbs);
650
651 printf("\n");
652 }
653
654 if (repeat) {
655 printf("\n");
656 fflush(stdout);
657 sleep(repeat);
658 goto again;
659 }
660
661 free(buf);
662 }
663
664 static struct in6_nbrinfo *
getnbrinfo(struct in6_addr * addr,int ifindex,int warning)665 getnbrinfo(struct in6_addr *addr, int ifindex, int warning)
666 {
667 static struct in6_nbrinfo nbi;
668 int s;
669
670 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) == -1)
671 err(1, "socket");
672
673 bzero(&nbi, sizeof(nbi));
674 if_indextoname(ifindex, nbi.ifname);
675 nbi.addr = *addr;
676 if (ioctl(s, SIOCGNBRINFO_IN6, (caddr_t)&nbi) == -1) {
677 if (warning)
678 warn("ioctl(SIOCGNBRINFO_IN6)");
679 close(s);
680 return(NULL);
681 }
682
683 close(s);
684 return(&nbi);
685 }
686
687 static char *
ether_str(struct sockaddr_dl * sdl)688 ether_str(struct sockaddr_dl *sdl)
689 {
690 static char hbuf[NI_MAXHOST];
691 u_char *cp;
692
693 if (sdl->sdl_alen) {
694 cp = (u_char *)LLADDR(sdl);
695 snprintf(hbuf, sizeof(hbuf), "%02x:%02x:%02x:%02x:%02x:%02x",
696 cp[0], cp[1], cp[2], cp[3], cp[4], cp[5]);
697 } else
698 snprintf(hbuf, sizeof(hbuf), "(incomplete)");
699
700 return(hbuf);
701 }
702
703 int
ndp_ether_aton(const char * a,u_char * n)704 ndp_ether_aton(const char *a, u_char *n)
705 {
706 int i, o[6];
707
708 i = sscanf(a, "%x:%x:%x:%x:%x:%x", &o[0], &o[1], &o[2],
709 &o[3], &o[4], &o[5]);
710 if (i != 6) {
711 warnx("invalid Ethernet address '%s'", a);
712 return (1);
713 }
714 for (i = 0; i < 6; i++)
715 n[i] = o[i];
716 return (0);
717 }
718
719 void
usage(void)720 usage(void)
721 {
722 printf("usage: ndp [-acnt] ");
723 printf("[-A wait] [-d hostname] [-f filename] [-i interface]\n");
724 printf("\t[-s nodename ether_addr [temp] [proxy]] ");
725 printf("[-V rdomain] [hostname]\n");
726 exit(1);
727 }
728
729 int
rtmsg(int cmd)730 rtmsg(int cmd)
731 {
732 static int seq;
733 int rlen;
734 struct rt_msghdr *rtm = &m_rtmsg.m_rtm;
735 char *cp = m_rtmsg.m_space;
736 int l;
737
738 errno = 0;
739 if (cmd == RTM_DELETE)
740 goto doit;
741 bzero((char *)&m_rtmsg, sizeof(m_rtmsg));
742 rtm->rtm_flags = flags;
743 rtm->rtm_version = RTM_VERSION;
744 rtm->rtm_tableid = rdomain;
745
746 switch (cmd) {
747 default:
748 errx(1, "internal wrong cmd");
749 case RTM_ADD:
750 rtm->rtm_addrs |= RTA_GATEWAY;
751 if (expire_time) {
752 rtm->rtm_rmx.rmx_expire = expire_time;
753 rtm->rtm_inits = RTV_EXPIRE;
754 }
755 rtm->rtm_flags |= (RTF_HOST | RTF_STATIC);
756 #if 0 /* we don't support ipv6addr/128 type proxying. */
757 if (rtm->rtm_flags & RTF_ANNOUNCE) {
758 rtm->rtm_flags &= ~RTF_HOST;
759 rtm->rtm_addrs |= RTA_NETMASK;
760 }
761 #endif
762 /* FALLTHROUGH */
763 case RTM_GET:
764 rtm->rtm_addrs |= (RTA_DST | RTA_IFP);
765 }
766
767 #define NEXTADDR(w, s) \
768 if (rtm->rtm_addrs & (w)) { \
769 memcpy(cp, &(s), sizeof(s)); \
770 ADVANCE(cp, (struct sockaddr *)&(s)); \
771 }
772
773 #ifdef __KAME__
774 {
775 struct sockaddr_in6 sin6 = sin_m;
776 struct in6_addr *in6 = &sin6.sin6_addr;
777 if (IN6_IS_ADDR_LINKLOCAL(in6) ||
778 IN6_IS_ADDR_MC_LINKLOCAL(in6) ||
779 IN6_IS_ADDR_MC_INTFACELOCAL(in6)) {
780 *(u_int16_t *)& in6->s6_addr[2] =
781 htons(sin6.sin6_scope_id);
782 sin6.sin6_scope_id = 0;
783 }
784 NEXTADDR(RTA_DST, sin6);
785 }
786 #else
787 NEXTADDR(RTA_DST, sin_m);
788 #endif
789 NEXTADDR(RTA_GATEWAY, sdl_m);
790 #if 0 /* we don't support ipv6addr/128 type proxying. */
791 memset(&so_mask.sin6_addr, 0xff, sizeof(so_mask.sin6_addr));
792 NEXTADDR(RTA_NETMASK, so_mask);
793 #endif
794 NEXTADDR(RTA_IFP, ifp_m);
795
796 rtm->rtm_msglen = cp - (char *)&m_rtmsg;
797 doit:
798 l = rtm->rtm_msglen;
799 rtm->rtm_seq = ++seq;
800 rtm->rtm_type = cmd;
801 if ((rlen = write(rtsock, (char *)&m_rtmsg, l)) == -1) {
802 if (errno != ESRCH || cmd != RTM_DELETE) {
803 err(1, "writing to routing socket");
804 }
805 }
806 do {
807 l = read(rtsock, (char *)&m_rtmsg, sizeof(m_rtmsg));
808 } while (l > 0 && (rtm->rtm_version != RTM_VERSION ||
809 rtm->rtm_seq != seq || rtm->rtm_pid != pid));
810 if (l == -1)
811 warn("read from routing socket");
812 return (0);
813 }
814
815 int
rtget(struct sockaddr_in6 ** sinp,struct sockaddr_dl ** sdlp)816 rtget(struct sockaddr_in6 **sinp, struct sockaddr_dl **sdlp)
817 {
818 struct rt_msghdr *rtm = &(m_rtmsg.m_rtm);
819 struct sockaddr_in6 *sin = NULL;
820 struct sockaddr_dl *sdl = NULL;
821 struct sockaddr *sa;
822 char *cp;
823 unsigned int i;
824
825 if (rtmsg(RTM_GET) < 0)
826 return (1);
827
828 if (rtm->rtm_addrs) {
829 cp = ((char *)rtm + rtm->rtm_hdrlen);
830 for (i = 1; i; i <<= 1) {
831 if (i & rtm->rtm_addrs) {
832 sa = (struct sockaddr *)cp;
833 switch (i) {
834 case RTA_DST:
835 sin = (struct sockaddr_in6 *)sa;
836 break;
837 case RTA_IFP:
838 sdl = (struct sockaddr_dl *)sa;
839 break;
840 default:
841 break;
842 }
843 ADVANCE(cp, sa);
844 }
845 }
846 }
847
848 if (sin == NULL || sdl == NULL)
849 return (1);
850
851 #ifdef __KAME__
852 {
853 static struct sockaddr_in6 ksin;
854 struct in6_addr *in6;
855
856 /* do not damage the route message, we need it for delete */
857 ksin = *sin;
858 sin = &ksin;
859 in6 = &sin->sin6_addr;
860
861 if ((IN6_IS_ADDR_LINKLOCAL(in6) ||
862 IN6_IS_ADDR_MC_LINKLOCAL(in6) ||
863 IN6_IS_ADDR_MC_INTFACELOCAL(in6)) &&
864 sin->sin6_scope_id == 0) {
865 sin->sin6_scope_id = (u_int32_t)ntohs(*(u_short *)
866 &in6->s6_addr[2]);
867 *(u_short *)&in6->s6_addr[2] = 0;
868 }
869 }
870 #endif
871 *sinp = sin;
872 *sdlp = sdl;
873
874 return (0);
875 }
876
877 void
ifinfo(const char * ifname)878 ifinfo(const char *ifname)
879 {
880 struct in6_ndireq nd;
881 int s;
882
883 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) == -1) {
884 err(1, "socket");
885 }
886 bzero(&nd, sizeof(nd));
887 strlcpy(nd.ifname, ifname, sizeof(nd.ifname));
888 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) == -1)
889 err(1, "ioctl(SIOCGIFINFO_IN6)");
890
891 printf("reachable=%ds\n", nd.ndi.reachable);
892
893 close(s);
894 }
895
896 static char *
sec2str(time_t total)897 sec2str(time_t total)
898 {
899 static char result[256];
900 int days, hours, mins, secs;
901 int first = 1;
902 char *p = result;
903 char *ep = &result[sizeof(result)];
904 int n;
905
906 days = total / 3600 / 24;
907 hours = (total / 3600) % 24;
908 mins = (total / 60) % 60;
909 secs = total % 60;
910
911 if (days) {
912 first = 0;
913 n = snprintf(p, ep - p, "%dd", days);
914 if (n < 0 || n >= ep - p)
915 return "?";
916 p += n;
917 }
918 if (!first || hours) {
919 first = 0;
920 n = snprintf(p, ep - p, "%dh", hours);
921 if (n < 0 || n >= ep - p)
922 return "?";
923 p += n;
924 }
925 if (!first || mins) {
926 first = 0;
927 n = snprintf(p, ep - p, "%dm", mins);
928 if (n < 0 || n >= ep - p)
929 return "?";
930 p += n;
931 }
932 snprintf(p, ep - p, "%ds", secs);
933
934 return(result);
935 }
936