1 /* $NetBSD: arp.c,v 1.68 2020/09/15 11:14:16 roy Exp $ */
2
3 /*
4 * Copyright (c) 1984, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Sun Microsystems, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include <sys/cdefs.h>
36 #ifndef lint
37 __COPYRIGHT("@(#) Copyright (c) 1984, 1993\
38 The Regents of the University of California. All rights reserved.");
39 #endif /* not lint */
40
41 #ifndef lint
42 #if 0
43 static char sccsid[] = "@(#)arp.c 8.3 (Berkeley) 4/28/95";
44 #else
45 __RCSID("$NetBSD: arp.c,v 1.68 2020/09/15 11:14:16 roy Exp $");
46 #endif
47 #endif /* not lint */
48
49 /*
50 * arp - display, set, and delete arp table entries
51 */
52
53 #include <sys/param.h>
54 #include <sys/file.h>
55 #include <sys/socket.h>
56 #include <sys/sysctl.h>
57 #include <sys/ioctl.h>
58
59 #include <net/if.h>
60 #include <net/if_dl.h>
61 #include <net/if_ether.h>
62 #include <net/if_types.h>
63 #include <net/nd.h>
64 #include <net/route.h>
65 #include <netinet/in.h>
66 #include <netinet/in_var.h>
67 #include <netinet/if_inarp.h>
68 #include <arpa/inet.h>
69
70 #include <err.h>
71 #include <errno.h>
72 #include <netdb.h>
73 #include <nlist.h>
74 #include <paths.h>
75 #include <stdio.h>
76 #include <stdlib.h>
77 #include <string.h>
78 #include <unistd.h>
79 #include <ifaddrs.h>
80
81 #include "prog_ops.h"
82
83 static int is_llinfo(const struct sockaddr_dl *, int);
84 static int delete_one(struct rt_msghdr *);
85 static void dump(uint32_t);
86 static void delete(const char *, const char *);
87 static void sdl_print(const struct sockaddr_dl *);
88 static int getifname(u_int16_t, char *, size_t);
89 static int atosdl(const char *, struct sockaddr_dl *);
90 static int file(const char *);
91 static void get(const char *);
92 static int getinetaddr(const char *, struct in_addr *);
93 static int getsocket(void);
94 static int getetheraddr(struct in_addr, struct sockaddr_dl *);
95 static struct rt_msghdr * rtmsg(const int, const int, struct rt_msghdr *,
96 const struct sockaddr_inarp *, const struct sockaddr_dl *);
97 static struct in_nbrinfo * getnbrinfo(const char *, struct in_addr *);
98 static const char * sec2str(time_t);
99 static int set(int, char **);
100 static void usage(void) __dead;
101
102 static int aflag, nflag, vflag;
103 static struct sockaddr_in so_mask = {
104 .sin_len = 8,
105 .sin_addr = {
106 .s_addr = 0xffffffff
107 }
108 };
109 static struct sockaddr_inarp blank_sin = {
110 .sin_len = sizeof(blank_sin),
111 .sin_family = AF_INET
112 };
113 static struct sockaddr_dl blank_sdl = {
114 .sdl_len = sizeof(blank_sdl),
115 .sdl_family = AF_LINK
116 };
117
118 static int expire_time, flags, export_only, doing_proxy, found_entry;
119
120 int
main(int argc,char ** argv)121 main(int argc, char **argv)
122 {
123 int ch;
124 int op = 0;
125
126 setprogname(argv[0]);
127
128 while ((ch = getopt(argc, argv, "andsfv")) != -1)
129 switch((char)ch) {
130 case 'a':
131 aflag = 1;
132 break;
133 case 'd':
134 case 's':
135 case 'f':
136 if (op)
137 usage();
138 op = ch;
139 break;
140 case 'n':
141 nflag = 1;
142 break;
143 case 'v':
144 vflag = 1;
145 break;
146 default:
147 usage();
148 }
149 argc -= optind;
150 argv += optind;
151
152 if (!op && aflag)
153 op = 'a';
154
155 if (prog_init && prog_init() == -1)
156 err(1, "init failed");
157
158 switch((char)op) {
159 case 'a':
160 dump(0);
161 break;
162 case 'd':
163 if (aflag && argc == 0)
164 delete(NULL, NULL);
165 else {
166 if (aflag || argc < 1 || argc > 2)
167 usage();
168 delete(argv[0], argv[1]);
169 }
170 break;
171 case 's':
172 if (argc < 2 || argc > 7)
173 usage();
174 return (set(argc, argv) ? 1 : 0);
175 case 'f':
176 if (argc != 1)
177 usage();
178 return (file(argv[0]));
179 default:
180 if (argc != 1)
181 usage();
182 get(argv[0]);
183 break;
184 }
185 return (0);
186 }
187
188 /*
189 * Process a file to set standard arp entries
190 */
191 static int
file(const char * name)192 file(const char *name)
193 {
194 char *line, *argv[5];
195 int i, retval;
196 FILE *fp;
197
198 if (!strcmp(name, "-")) {
199 fp = stdin;
200 } else {
201 fp = fopen(name, "r");
202 if (fp == NULL) {
203 err(1, "Cannot open %s", name);
204 }
205 }
206 retval = 0;
207 for (; (line = fparseln(fp, NULL, NULL, NULL, 0)) != NULL; free(line)) {
208 char **ap, *inputstring;
209
210 inputstring = line;
211 for (ap = argv; ap < &argv[sizeof(argv) / sizeof(argv[0])] &&
212 (*ap = stresep(&inputstring, " \t", '\\')) != NULL;) {
213 if (**ap != '\0')
214 ap++;
215 }
216 i = ap - argv;
217 if (i < 2) {
218 warnx("bad line: %s", line);
219 retval = 1;
220 continue;
221 }
222 if (set(i, argv))
223 retval = 1;
224 }
225 if (fp != stdin)
226 (void)fclose(fp);
227 return retval;
228 }
229
230 static int
getsocket(void)231 getsocket(void)
232 {
233 int s;
234 s = prog_socket(PF_ROUTE, SOCK_RAW, 0);
235 if (s < 0)
236 err(1, "socket");
237 return s;
238 }
239
240 static int
getlink(const char * name,struct sockaddr_dl * sdl)241 getlink(const char *name, struct sockaddr_dl *sdl)
242 {
243 struct ifaddrs *ifap, *ifa;
244
245 if (getifaddrs(&ifap) != 0) {
246 warn("getifaddrs");
247 return 0;
248 }
249
250 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
251 if (ifa->ifa_addr->sa_family != AF_LINK)
252 continue;
253 if (strcmp(ifa->ifa_name, name) != 0)
254 continue;
255 memcpy(sdl, ifa->ifa_addr, sizeof(*sdl));
256 freeifaddrs(ifap);
257 return 1;
258 }
259 freeifaddrs(ifap);
260 return 0;
261 }
262
263 /*
264 * Set an individual arp entry
265 */
266 static int
set(int argc,char ** argv)267 set(int argc, char **argv)
268 {
269 struct sockaddr_inarp *sina;
270 struct sockaddr_dl *sdl = NULL;
271 struct rt_msghdr *rtm;
272 char *host = argv[0], *eaddr;
273 struct sockaddr_inarp sin_m = blank_sin; /* struct copy */
274 struct sockaddr_dl sdl_m = blank_sdl; /* struct copy */
275 int s;
276
277 eaddr = argv[1];
278
279 s = getsocket();
280 argc -= 2;
281 argv += 2;
282
283 if (getinetaddr(host, &sin_m.sin_addr) == -1) {
284 prog_close(s);
285 return (1);
286 }
287 if (strcmp(eaddr, "auto") != 0 && atosdl(eaddr, &sdl_m))
288 warnx("invalid link-level address '%s'", eaddr);
289 doing_proxy = flags = export_only = expire_time = 0;
290 for (; argc-- > 0; argv++) {
291 if (strncmp(argv[0], "temp", 4) == 0) {
292 struct timeval timev;
293 (void)gettimeofday(&timev, 0);
294 expire_time = timev.tv_sec + 20 * 60;
295 }
296 else if (strncmp(argv[0], "pub", 3) == 0) {
297 flags |= RTF_ANNOUNCE;
298 doing_proxy = 1;
299 if (argc && strncmp(argv[1], "pro", 3) == 0) {
300 export_only = 1;
301 argc--; argv++;
302 }
303 } else if (strncmp(argv[0], "trail", 5) == 0) {
304 warnx("%s: Sending trailers is no longer supported",
305 host);
306 } else if (strcmp(argv[0], "ifscope") == 0) {
307 if (argc == 0) {
308 warnx("missing interface for ifscope");
309 continue;
310 }
311 argc--;
312 argv++;
313 if (!getlink(argv[0], &sdl_m))
314 warnx("cannot get link address for %s", argv[0]);
315 }
316
317 }
318 if (doing_proxy && strcmp(eaddr, "auto") == 0) {
319 if (getetheraddr(sin_m.sin_addr, &sdl_m) == -1) {
320 prog_close(s);
321 return 1;
322 }
323 }
324 tryagain:
325 rtm = rtmsg(s, RTM_GET, NULL, &sin_m, &sdl_m);
326 if (rtm == NULL) {
327 warn("%s", host);
328 prog_close(s);
329 return (1);
330 }
331 sina = (struct sockaddr_inarp *)(void *)(rtm + 1);
332 sdl = (struct sockaddr_dl *)(void *)(RT_ROUNDUP(sina->sin_len) +
333 (char *)(void *)sina);
334 if (sina->sin_addr.s_addr == sin_m.sin_addr.s_addr) {
335 if (is_llinfo(sdl, rtm->rtm_flags))
336 goto overwrite;
337 if (doing_proxy == 0) {
338 warnx("set: can only proxy for %s", host);
339 prog_close(s);
340 return (1);
341 }
342 if (sin_m.sin_other & SIN_PROXY) {
343 warnx("set: proxy entry exists for non 802 device");
344 prog_close(s);
345 return (1);
346 }
347 sin_m.sin_other = SIN_PROXY;
348 export_only = 1;
349 goto tryagain;
350 }
351 overwrite:
352 if (sdl->sdl_family != AF_LINK) {
353 warnx("cannot intuit interface index and type for %s",
354 host);
355 prog_close(s);
356 return (1);
357 }
358 sdl_m.sdl_type = sdl->sdl_type;
359 sdl_m.sdl_index = sdl->sdl_index;
360 sin_m.sin_other = 0;
361 if (doing_proxy && export_only)
362 sin_m.sin_other = SIN_PROXY;
363 rtm = rtmsg(s, RTM_ADD, NULL, &sin_m, &sdl_m);
364 if (vflag)
365 (void)printf("%s (%s) added\n", host, eaddr);
366 prog_close(s);
367 return (rtm == NULL) ? 1 : 0;
368 }
369
370 /*
371 * Display an individual arp entry
372 */
373 static void
get(const char * host)374 get(const char *host)
375 {
376 struct sockaddr_inarp sin = blank_sin; /* struct copy */
377
378 if (getinetaddr(host, &sin.sin_addr) == -1)
379 exit(1);
380 dump(sin.sin_addr.s_addr);
381 if (found_entry == 0)
382 errx(1, "%s (%s) -- no entry", host, inet_ntoa(sin.sin_addr));
383 }
384
385
386 static int
is_llinfo(const struct sockaddr_dl * sdl,int rtflags)387 is_llinfo(const struct sockaddr_dl *sdl, int rtflags)
388 {
389 if (sdl->sdl_family != AF_LINK ||
390 (rtflags & (RTF_LLDATA|RTF_GATEWAY)) != RTF_LLDATA)
391 return 0;
392
393 switch (sdl->sdl_type) {
394 case IFT_ETHER:
395 case IFT_FDDI:
396 case IFT_ISO88023:
397 case IFT_ISO88024:
398 case IFT_ISO88025:
399 case IFT_ARCNET:
400 return 1;
401 default:
402 return 0;
403 }
404 }
405
406 /*
407 * Delete an arp entry
408 */
409 int
delete_one(struct rt_msghdr * rtm)410 delete_one(struct rt_msghdr *rtm)
411 {
412 struct sockaddr_inarp *sina;
413 struct sockaddr_dl *sdl;
414 int s;
415
416 s = getsocket();
417 sina = (struct sockaddr_inarp *)(void *)(rtm + 1);
418 sdl = (struct sockaddr_dl *)(void *)(RT_ROUNDUP(sina->sin_len) +
419 (char *)(void *)sina);
420 if (sdl->sdl_family != AF_LINK) {
421 prog_close(s);
422 return (1);
423 }
424 rtm = rtmsg(s, RTM_DELETE, rtm, sina, sdl);
425 prog_close(s);
426 if (rtm == NULL)
427 return (1);
428 return (0);
429 }
430
431 /*
432 * Dump the entire arp table
433 */
434 void
dump(uint32_t addr)435 dump(uint32_t addr)
436 {
437 int mib[6];
438 size_t needed;
439 char ifname[IFNAMSIZ];
440 char *lim, *buf, *next;
441 const char *host;
442 struct rt_msghdr *rtm;
443 struct sockaddr_inarp *sina;
444 struct sockaddr_dl *sdl;
445 struct hostent *hp;
446 struct timeval tim;
447 struct in_nbrinfo *nbi;
448
449 mib[0] = CTL_NET;
450 mib[1] = PF_ROUTE;
451 mib[2] = 0;
452 mib[3] = AF_INET;
453 mib[4] = NET_RT_FLAGS;
454 mib[5] = 0;
455 if (prog_sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
456 err(1, "route-sysctl-estimate");
457 if (needed == 0)
458 return;
459 if ((buf = malloc(needed)) == NULL)
460 err(1, "malloc");
461 if (prog_sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
462 err(1, "actual retrieval of routing table");
463 lim = buf + needed;
464 for (next = buf; next < lim; next += rtm->rtm_msglen) {
465 rtm = (struct rt_msghdr *)(void *)next;
466 sina = (struct sockaddr_inarp *)(void *)(rtm + 1);
467 sdl = (struct sockaddr_dl *)(void *)
468 (RT_ROUNDUP(sina->sin_len) + (char *)(void *)sina);
469 if (addr) {
470 if (addr != sina->sin_addr.s_addr)
471 continue;
472 found_entry = 1;
473 }
474 if (nflag == 0)
475 hp = gethostbyaddr((const char *)(void *)
476 &(sina->sin_addr),
477 sizeof sina->sin_addr, AF_INET);
478 else
479 hp = NULL;
480
481 host = hp ? hp->h_name : "?";
482
483 (void)printf("%s (%s) at ", host, inet_ntoa(sina->sin_addr));
484 if (sdl->sdl_alen)
485 sdl_print(sdl);
486 else
487 (void)printf("(incomplete)");
488
489 if (sdl->sdl_index) {
490 if (getifname(sdl->sdl_index, ifname, sizeof(ifname)) == 0)
491 (void)printf(" on %s", ifname);
492 }
493
494 if (sina->sin_other & SIN_PROXY)
495 (void)printf(" published (proxy only)");
496 if (rtm->rtm_addrs & RTA_NETMASK) {
497 sina = (struct sockaddr_inarp *)(void *)
498 (RT_ROUNDUP(sdl->sdl_len) + (char *)(void *)sdl);
499 if (sina->sin_addr.s_addr == 0xffffffff)
500 (void)printf(" published");
501 if (sina->sin_len != 8)
502 (void)printf("(weird)");
503 }
504
505 if (sdl->sdl_index == 0)
506 goto done;
507 (void)gettimeofday(&tim, 0);
508 nbi = getnbrinfo(ifname, &sina->sin_addr);
509 if (nbi != NULL) {
510 if (nbi->expire > tim.tv_sec) {
511 (void)printf(" %s",
512 sec2str(nbi->expire - tim.tv_sec));
513 } else if (nbi->expire == 0)
514 (void)printf(" %s", "permanent");
515 else
516 (void)printf(" %s", "expired");
517
518 switch (nbi->state) {
519 case ND_LLINFO_NOSTATE:
520 (void)printf(" N");
521 break;
522 case ND_LLINFO_WAITDELETE:
523 (void)printf(" W");
524 break;
525 case ND_LLINFO_INCOMPLETE:
526 (void)printf(" I");
527 break;
528 case ND_LLINFO_REACHABLE:
529 (void)printf(" R");
530 break;
531 case ND_LLINFO_STALE:
532 (void)printf(" S");
533 break;
534 case ND_LLINFO_DELAY:
535 (void)printf(" D");
536 break;
537 case ND_LLINFO_PROBE:
538 (void)printf(" P");
539 break;
540 case ND_LLINFO_UNREACHABLE:
541 (void)printf(" U");
542 break;
543 default:
544 (void)printf(" ?");
545 break;
546 }
547 }
548
549 done:
550 (void)printf("\n");
551 }
552 free(buf);
553 }
554
555 /*
556 * Delete the entire arp table
557 */
558 void
delete(const char * host,const char * info)559 delete(const char *host, const char *info)
560 {
561 int mib[6];
562 char addr[sizeof("000.000.000.000\0")];
563 size_t needed;
564 char *lim, *buf, *next;
565 struct rt_msghdr *rtm;
566 struct sockaddr_inarp *sina;
567 struct sockaddr_inarp sin_m = blank_sin; /* struct copy */
568 bool found = false;
569
570 if (host != NULL) {
571 int ret = getinetaddr(host, &sin_m.sin_addr);
572 if (ret == -1)
573 return;
574 }
575 if (info && strncmp(info, "pro", 3) == 0)
576 sin_m.sin_other = SIN_PROXY;
577
578 retry:
579 mib[0] = CTL_NET;
580 mib[1] = PF_ROUTE;
581 mib[2] = 0;
582 mib[3] = AF_INET;
583 mib[4] = NET_RT_FLAGS;
584 mib[5] = RTF_LLDATA;
585 if (prog_sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
586 err(1, "route-sysctl-estimate");
587 if (needed == 0)
588 return;
589 if ((buf = malloc(needed)) == NULL)
590 err(1, "malloc");
591 if (prog_sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
592 free(buf);
593 if (errno == ENOBUFS)
594 goto retry;
595 err(1, "actual retrieval of routing table");
596 }
597 lim = buf + needed;
598
599 for (next = buf; next < lim; next += rtm->rtm_msglen) {
600 int ret;
601 rtm = (struct rt_msghdr *)(void *)next;
602 sina = (struct sockaddr_inarp *)(void *)(rtm + 1);
603 if (host != NULL &&
604 sina->sin_addr.s_addr != sin_m.sin_addr.s_addr)
605 continue;
606 found = true;
607 ret = delete_one(rtm);
608 if (vflag && ret == 0) {
609 snprintf(addr, sizeof(addr), "%s",
610 inet_ntoa(sina->sin_addr));
611 (void)printf("%s (%s) deleted\n",
612 host != NULL ? host : addr, addr);
613 }
614 }
615 if (host != NULL && !found)
616 warnx("delete: can't locate %s", host);
617 free(buf);
618 }
619
620 void
sdl_print(const struct sockaddr_dl * sdl)621 sdl_print(const struct sockaddr_dl *sdl)
622 {
623 char hbuf[NI_MAXHOST];
624
625 if (getnameinfo((const struct sockaddr *)(const void *)sdl,
626 (socklen_t)sdl->sdl_len,
627 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
628 (void)printf("<invalid>");
629 else
630 (void)printf("%s", hbuf);
631 }
632
633 static int
atosdl(const char * ss,struct sockaddr_dl * sdl)634 atosdl(const char *ss, struct sockaddr_dl *sdl)
635 {
636 int i;
637 unsigned long b;
638 char *endp;
639 char *p;
640 char *t, *r;
641
642 p = LLADDR(sdl);
643 endp = ((char *)(void *)sdl) + sdl->sdl_len;
644 i = 0;
645
646 b = strtoul(ss, &t, 16);
647 if (b > 255 || t == ss)
648 return 1;
649
650 *p++ = (char)b;
651 ++i;
652 while ((p < endp) && (*t++ == ':')) {
653 b = strtoul(t, &r, 16);
654 if (b > 255 || r == t)
655 break;
656 *p++ = (char)b;
657 ++i;
658 t = r;
659 }
660 sdl->sdl_alen = i;
661
662 return 0;
663 }
664
665 static void
usage(void)666 usage(void)
667 {
668 const char *progname;
669
670 progname = getprogname();
671 (void)fprintf(stderr, "Usage: %s [-n] hostname\n", progname);
672 (void)fprintf(stderr, " %s [-nv] -a\n", progname);
673 (void)fprintf(stderr, " %s [-v] -d [-a|hostname [proxy]]\n",
674 progname);
675 (void)fprintf(stderr, " %s -s hostname ether_addr [temp] [pub [proxy]]\n",
676 progname);
677 (void)fprintf(stderr, " %s -f filename\n", progname);
678 exit(1);
679 }
680
681 static struct rt_msghdr *
rtmsg(const int s,const int cmd,struct rt_msghdr * _rtm,const struct sockaddr_inarp * sin,const struct sockaddr_dl * sdl)682 rtmsg(const int s, const int cmd, struct rt_msghdr *_rtm,
683 const struct sockaddr_inarp *sin, const struct sockaddr_dl *sdl)
684 {
685 static int seq;
686 struct rt_msghdr *rtm = _rtm;
687 char *cp;
688 int l;
689 static struct {
690 struct rt_msghdr m_rtm;
691 char m_space[512];
692 } m_rtmsg;
693 pid_t pid;
694
695 errno = 0;
696 if (rtm != NULL) {
697 memcpy(&m_rtmsg, rtm, rtm->rtm_msglen);
698 rtm = &m_rtmsg.m_rtm;
699 goto doit;
700 }
701 (void)memset(&m_rtmsg, 0, sizeof(m_rtmsg));
702 rtm = &m_rtmsg.m_rtm;
703 cp = m_rtmsg.m_space;
704
705 rtm->rtm_flags = flags;
706 rtm->rtm_version = RTM_VERSION;
707
708 switch (cmd) {
709 default:
710 errx(1, "internal wrong cmd");
711 /*NOTREACHED*/
712 case RTM_ADD:
713 rtm->rtm_addrs |= RTA_GATEWAY;
714 rtm->rtm_rmx.rmx_expire = expire_time;
715 rtm->rtm_inits = RTV_EXPIRE;
716 rtm->rtm_flags |= (RTF_HOST | RTF_STATIC | RTF_LLDATA);
717 if (doing_proxy) {
718 if (!export_only) {
719 rtm->rtm_addrs |= RTA_NETMASK;
720 rtm->rtm_flags &= ~RTF_HOST;
721 }
722 }
723 rtm->rtm_addrs |= RTA_DST;
724 break;
725 case RTM_GET:
726 rtm->rtm_flags |= RTF_LLDATA;
727 rtm->rtm_addrs |= RTA_DST | RTA_GATEWAY;
728 }
729
730 #define NEXTADDR(w, s) \
731 if (rtm->rtm_addrs & (w)) { \
732 (void)memcpy(cp, &s, \
733 (size_t)((const struct sockaddr *)&s)->sa_len); \
734 RT_ADVANCE(cp, ((const struct sockaddr *)&s)); \
735 }
736
737 NEXTADDR(RTA_DST, *sin);
738 NEXTADDR(RTA_GATEWAY, *sdl);
739 NEXTADDR(RTA_NETMASK, so_mask);
740
741 rtm->rtm_msglen = cp - (char *)(void *)&m_rtmsg;
742 doit:
743 l = rtm->rtm_msglen;
744 rtm->rtm_seq = ++seq;
745 rtm->rtm_type = cmd;
746 if (prog_write(s, &m_rtmsg, (size_t)l) < 0) {
747 if (errno != ESRCH || cmd != RTM_DELETE) {
748 warn("writing to routing socket");
749 return NULL;
750 }
751 }
752
753 pid = prog_getpid();
754 do {
755 l = prog_read(s, &m_rtmsg, sizeof(m_rtmsg));
756 } while (l > 0 && (rtm->rtm_seq != seq || rtm->rtm_pid != pid));
757 if (l < 0)
758 warn("read from routing socket");
759 return rtm;
760 }
761
762 static int
getinetaddr(const char * host,struct in_addr * inap)763 getinetaddr(const char *host, struct in_addr *inap)
764 {
765 struct hostent *hp;
766
767 if (inet_aton(host, inap) == 1)
768 return (0);
769 if ((hp = gethostbyname(host)) == NULL) {
770 warnx("%s: %s", host, hstrerror(h_errno));
771 return (-1);
772 }
773 (void)memcpy(inap, hp->h_addr, sizeof(*inap));
774 return (0);
775 }
776
777 static int
getifname(u_int16_t ifindex,char * ifname,size_t l)778 getifname(u_int16_t ifindex, char *ifname, size_t l)
779 {
780 int i;
781 struct ifaddrs *addr;
782 const struct sockaddr_dl *sdl;
783 static struct ifaddrs* ifaddrs = NULL;
784
785 if (ifaddrs == NULL) {
786 i = getifaddrs(&ifaddrs);
787 if (i != 0)
788 err(1, "getifaddrs");
789 }
790
791 for (addr = ifaddrs; addr; addr = addr->ifa_next) {
792 if (addr->ifa_addr == NULL ||
793 addr->ifa_addr->sa_family != AF_LINK)
794 continue;
795
796 sdl = (const struct sockaddr_dl *)(void *)addr->ifa_addr;
797 if (sdl && sdl->sdl_index == ifindex) {
798 (void) strlcpy(ifname, addr->ifa_name, l);
799 return 0;
800 }
801 }
802
803 return -1;
804 }
805
806 static int
getetheraddr(struct in_addr ipaddr,struct sockaddr_dl * sdl)807 getetheraddr(struct in_addr ipaddr, struct sockaddr_dl *sdl)
808 {
809 struct ifaddrs *ifaddrs, *addr;
810 in_addr_t ina, mask;
811 char ifname[IFNAMSIZ];
812
813 if (getifaddrs(&ifaddrs) != 0) {
814 warn("getifaddrs");
815 return -1;
816 }
817
818 for (addr = ifaddrs; addr; addr = addr->ifa_next) {
819 if (addr->ifa_addr == NULL ||
820 addr->ifa_addr->sa_family != AF_INET)
821 continue;
822 if ((addr->ifa_flags & (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|
823 IFF_LOOPBACK|IFF_NOARP)) != (IFF_UP|IFF_BROADCAST))
824 continue;
825
826 mask = ((struct sockaddr_in *)(void *)addr->ifa_netmask)->sin_addr.s_addr;
827 ina = ((struct sockaddr_in *)(void *)addr->ifa_addr)->sin_addr.s_addr;
828 if ((ipaddr.s_addr & mask) != (ina & mask))
829 continue;
830 strlcpy(ifname, addr->ifa_name, sizeof(ifname));
831 break;
832 }
833 if (addr == NULL) {
834 warnx("No interface matched %s", inet_ntoa(ipaddr));
835 freeifaddrs(ifaddrs);
836 return -1;
837 }
838
839 for (addr = ifaddrs; addr; addr = addr->ifa_next) {
840 if (addr->ifa_addr == NULL ||
841 addr->ifa_addr->sa_family != AF_LINK)
842 continue;
843 if (strcmp(ifname, addr->ifa_name) != 0)
844 continue;
845 memcpy(sdl, addr->ifa_addr, sizeof(*sdl));
846 freeifaddrs(ifaddrs);
847 return 0;
848 }
849 warnx("No link address for interface %s", ifname);
850 freeifaddrs(ifaddrs);
851 return -1;
852 }
853
854 static struct in_nbrinfo *
getnbrinfo(const char * ifname,struct in_addr * addr)855 getnbrinfo(const char *ifname, struct in_addr *addr)
856 {
857 static struct in_nbrinfo nbi, *nbip;
858 int s;
859
860 if ((s = prog_socket(AF_INET, SOCK_DGRAM, 0)) == -1)
861 err(1, "socket");
862
863 (void)memset(&nbi, 0, sizeof(nbi));
864 (void)strlcpy(nbi.ifname, ifname, sizeof(nbi.ifname));
865 nbi.addr = *addr;
866 if (prog_ioctl(s, SIOCGNBRINFO, &nbi) == -1) {
867 warn("ioctl(SIOCGNBRINFO)");
868 nbip = NULL;
869 } else
870 nbip = &nbi;
871 (void)prog_close(s);
872
873 return nbip;
874 }
875
876 static const char *
sec2str(time_t total)877 sec2str(time_t total)
878 {
879 static char result[256];
880 int days, hours, mins, secs;
881 int first = 1;
882 char *p = result;
883 char *ep = &result[sizeof(result)];
884 int n;
885
886 days = total / 3600 / 24;
887 hours = (total / 3600) % 24;
888 mins = (total / 60) % 60;
889 secs = total % 60;
890
891 if (days) {
892 first = 0;
893 n = snprintf(p, (size_t)(ep - p), "%dd", days);
894 if (n < 0 || n >= ep - p)
895 return "?";
896 p += n;
897 }
898 if (!first || hours) {
899 first = 0;
900 n = snprintf(p, (size_t)(ep - p), "%dh", hours);
901 if (n < 0 || n >= ep - p)
902 return "?";
903 p += n;
904 }
905 if (!first || mins) {
906 first = 0;
907 n = snprintf(p, (size_t)(ep - p), "%dm", mins);
908 if (n < 0 || n >= ep - p)
909 return "?";
910 p += n;
911 }
912 (void)snprintf(p, (size_t)(ep - p), "%ds", secs);
913
914 return(result);
915 }
916