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1 | /* |
2 | * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. | |
3 | * | |
4 | * @APPLE_LICENSE_HEADER_START@ | |
5 | * | |
6 | * "Portions Copyright (c) 1999 Apple Computer, Inc. All Rights | |
7 | * Reserved. This file contains Original Code and/or Modifications of | |
8 | * Original Code as defined in and that are subject to the Apple Public | |
9 | * Source License Version 1.0 (the 'License'). You may not use this file | |
10 | * except in compliance with the License. Please obtain a copy of the | |
11 | * License at http://www.apple.com/publicsource and read it before using | |
12 | * this file. | |
13 | * | |
14 | * The Original Code and all software distributed under the License are | |
15 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
16 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
17 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the | |
19 | * License for the specific language governing rights and limitations | |
20 | * under the License." | |
21 | * | |
22 | * @APPLE_LICENSE_HEADER_END@ | |
23 | */ | |
24 | /* | |
25 | * Copyright (c) 1984, 1993 | |
26 | * The Regents of the University of California. All rights reserved. | |
27 | * | |
28 | * This code is derived from software contributed to Berkeley by | |
29 | * Sun Microsystems, Inc. | |
30 | * | |
31 | * Redistribution and use in source and binary forms, with or without | |
32 | * modification, are permitted provided that the following conditions | |
33 | * are met: | |
34 | * 1. Redistributions of source code must retain the above copyright | |
35 | * notice, this list of conditions and the following disclaimer. | |
36 | * 2. Redistributions in binary form must reproduce the above copyright | |
37 | * notice, this list of conditions and the following disclaimer in the | |
38 | * documentation and/or other materials provided with the distribution. | |
39 | * 3. All advertising materials mentioning features or use of this software | |
40 | * must display the following acknowledgement: | |
41 | * This product includes software developed by the University of | |
42 | * California, Berkeley and its contributors. | |
43 | * 4. Neither the name of the University nor the names of its contributors | |
44 | * may be used to endorse or promote products derived from this software | |
45 | * without specific prior written permission. | |
46 | * | |
47 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
48 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
49 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
50 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
51 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
52 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
53 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
54 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
55 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
56 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
57 | * SUCH DAMAGE. | |
58 | */ | |
59 | ||
60 | #ifndef lint | |
61 | static char copyright[] = | |
62 | "@(#) Copyright (c) 1984, 1993\n\ | |
63 | The Regents of the University of California. All rights reserved.\n"; | |
64 | #endif /* not lint */ | |
65 | ||
66 | #ifndef lint | |
67 | static char sccsid[] = "@(#)arp.c 8.3 (Berkeley) 4/28/95"; | |
68 | #endif /* not lint */ | |
69 | ||
70 | /* | |
71 | * arp - display, set, and delete arp table entries | |
72 | */ | |
73 | ||
74 | ||
75 | #include <sys/param.h> | |
76 | #include <sys/file.h> | |
77 | #include <sys/socket.h> | |
78 | #include <sys/sysctl.h> | |
79 | ||
80 | #include <net/if.h> | |
81 | #include <net/if_dl.h> | |
82 | #include <net/if_types.h> | |
83 | #include <net/route.h> | |
84 | ||
85 | #include <netinet/in.h> | |
86 | #include <netinet/if_ether.h> | |
87 | ||
88 | #include <arpa/inet.h> | |
89 | ||
90 | #include <err.h> | |
91 | #include <errno.h> | |
92 | #include <netdb.h> | |
93 | #include <nlist.h> | |
94 | #include <paths.h> | |
95 | #include <stdio.h> | |
96 | #include <stdlib.h> | |
97 | #include <string.h> | |
98 | #include <unistd.h> | |
99 | ||
100 | static int pid; | |
101 | static int nflag; | |
102 | static int s = -1; | |
103 | ||
104 | int delete __P((char *, char *)); | |
105 | void dump __P((u_long)); | |
106 | int ether_aton __P((char *, u_char *)); | |
107 | void ether_print __P((u_char *)); | |
108 | int file __P((char *)); | |
109 | void get __P((char *)); | |
110 | void getsocket __P((void)); | |
111 | int rtmsg __P((int)); | |
112 | int set __P((int, char **)); | |
113 | void usage __P((void)); | |
114 | ||
115 | int | |
116 | main(argc, argv) | |
117 | int argc; | |
118 | char **argv; | |
119 | { | |
120 | int ch; | |
121 | ||
122 | pid = getpid(); | |
123 | while ((ch = getopt(argc, argv, "ands")) != EOF) | |
124 | switch((char)ch) { | |
125 | case 'a': | |
126 | dump(0); | |
127 | exit(0); | |
128 | case 'd': | |
129 | if (argc < 3 || argc > 4) | |
130 | usage(); | |
131 | delete(argv[2], argv[3]); | |
132 | exit(0); | |
133 | case 'n': | |
134 | nflag = 1; | |
135 | continue; | |
136 | case 's': | |
137 | if (argc < 4 || argc > 7) | |
138 | usage(); | |
139 | exit(set(argc-2, &argv[2]) ? 1 : 0); | |
140 | case '?': | |
141 | default: | |
142 | usage(); | |
143 | } | |
144 | if (argc != 2) | |
145 | usage(); | |
146 | get(argv[1]); | |
147 | return (0); | |
148 | } | |
149 | ||
150 | /* | |
151 | * Process a file to set standard arp entries | |
152 | */ | |
153 | int | |
154 | file(name) | |
155 | char *name; | |
156 | { | |
157 | FILE *fp; | |
158 | int i, retval; | |
159 | char line[100], arg[5][50], *args[5]; | |
160 | ||
161 | if ((fp = fopen(name, "r")) == NULL) { | |
162 | fprintf(stderr, "arp: cannot open %s\n", name); | |
163 | exit(1); | |
164 | } | |
165 | args[0] = &arg[0][0]; | |
166 | args[1] = &arg[1][0]; | |
167 | args[2] = &arg[2][0]; | |
168 | args[3] = &arg[3][0]; | |
169 | args[4] = &arg[4][0]; | |
170 | retval = 0; | |
171 | while(fgets(line, 100, fp) != NULL) { | |
172 | i = sscanf(line, "%s %s %s %s %s", arg[0], arg[1], arg[2], | |
173 | arg[3], arg[4]); | |
174 | if (i < 2) { | |
175 | fprintf(stderr, "arp: bad line: %s\n", line); | |
176 | retval = 1; | |
177 | continue; | |
178 | } | |
179 | if (set(i, args)) | |
180 | retval = 1; | |
181 | } | |
182 | fclose(fp); | |
183 | return (retval); | |
184 | } | |
185 | ||
186 | void | |
187 | getsocket() { | |
188 | if (s < 0) { | |
189 | s = socket(PF_ROUTE, SOCK_RAW, 0); | |
190 | if (s < 0) { | |
191 | perror("arp: socket"); | |
192 | exit(1); | |
193 | } | |
194 | } | |
195 | } | |
196 | ||
197 | struct sockaddr_in so_mask = {8, 0, 0, { 0xffffffff}}; | |
198 | struct sockaddr_inarp blank_sin = {sizeof(blank_sin), AF_INET }, sin_m; | |
199 | struct sockaddr_dl blank_sdl = {sizeof(blank_sdl), AF_LINK }, sdl_m; | |
200 | int expire_time, flags, export_only, doing_proxy, found_entry; | |
201 | struct { | |
202 | struct rt_msghdr m_rtm; | |
203 | char m_space[512]; | |
204 | } m_rtmsg; | |
205 | ||
206 | /* | |
207 | * Set an individual arp entry | |
208 | */ | |
209 | int | |
210 | set(argc, argv) | |
211 | int argc; | |
212 | char **argv; | |
213 | { | |
214 | struct hostent *hp; | |
215 | register struct sockaddr_inarp *sin = &sin_m; | |
216 | register struct sockaddr_dl *sdl; | |
217 | register struct rt_msghdr *rtm = &(m_rtmsg.m_rtm); | |
218 | u_char *ea; | |
219 | char *host = argv[0], *eaddr = argv[1]; | |
220 | ||
221 | getsocket(); | |
222 | argc -= 2; | |
223 | argv += 2; | |
224 | sdl_m = blank_sdl; | |
225 | sin_m = blank_sin; | |
226 | sin->sin_addr.s_addr = inet_addr(host); | |
227 | if (sin->sin_addr.s_addr == -1) { | |
228 | if (!(hp = gethostbyname(host))) { | |
229 | fprintf(stderr, "arp: %s: ", host); | |
230 | herror((char *)NULL); | |
231 | return (1); | |
232 | } | |
233 | bcopy((char *)hp->h_addr, (char *)&sin->sin_addr, | |
234 | sizeof sin->sin_addr); | |
235 | } | |
236 | ea = (u_char *)LLADDR(&sdl_m); | |
237 | if (ether_aton(eaddr, ea) == 0) | |
238 | sdl_m.sdl_alen = 6; | |
239 | doing_proxy = flags = export_only = expire_time = 0; | |
240 | while (argc-- > 0) { | |
241 | if (strncmp(argv[0], "temp", 4) == 0) { | |
242 | struct timeval time; | |
243 | gettimeofday(&time, 0); | |
244 | expire_time = time.tv_sec + 20 * 60; | |
245 | } | |
246 | else if (strncmp(argv[0], "pub", 3) == 0) { | |
247 | flags |= RTF_ANNOUNCE; | |
248 | doing_proxy = SIN_PROXY; | |
249 | } else if (strncmp(argv[0], "trail", 5) == 0) { | |
250 | printf("%s: Sending trailers is no longer supported\n", | |
251 | host); | |
252 | } | |
253 | argv++; | |
254 | } | |
255 | tryagain: | |
256 | if (rtmsg(RTM_GET) < 0) { | |
257 | perror(host); | |
258 | return (1); | |
259 | } | |
260 | sin = (struct sockaddr_inarp *)(rtm + 1); | |
261 | sdl = (struct sockaddr_dl *)(sin->sin_len + (char *)sin); | |
262 | if (sin->sin_addr.s_addr == sin_m.sin_addr.s_addr) { | |
263 | if (sdl->sdl_family == AF_LINK && | |
264 | (rtm->rtm_flags & RTF_LLINFO) && | |
265 | !(rtm->rtm_flags & RTF_GATEWAY)) switch (sdl->sdl_type) { | |
266 | case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023: | |
267 | case IFT_ISO88024: case IFT_ISO88025: | |
268 | goto overwrite; | |
269 | } | |
270 | if (doing_proxy == 0) { | |
271 | printf("set: can only proxy for %s\n", host); | |
272 | return (1); | |
273 | } | |
274 | if (sin_m.sin_other & SIN_PROXY) { | |
275 | printf("set: proxy entry exists for non 802 device\n"); | |
276 | return(1); | |
277 | } | |
278 | sin_m.sin_other = SIN_PROXY; | |
279 | export_only = 1; | |
280 | goto tryagain; | |
281 | } | |
282 | overwrite: | |
283 | if (sdl->sdl_family != AF_LINK) { | |
284 | printf("cannot intuit interface index and type for %s\n", host); | |
285 | return (1); | |
286 | } | |
287 | sdl_m.sdl_type = sdl->sdl_type; | |
288 | sdl_m.sdl_index = sdl->sdl_index; | |
289 | return (rtmsg(RTM_ADD)); | |
290 | } | |
291 | ||
292 | /* | |
293 | * Display an individual arp entry | |
294 | */ | |
295 | void | |
296 | get(host) | |
297 | char *host; | |
298 | { | |
299 | struct hostent *hp; | |
300 | struct sockaddr_inarp *sin = &sin_m; | |
301 | ||
302 | sin_m = blank_sin; | |
303 | sin->sin_addr.s_addr = inet_addr(host); | |
304 | if (sin->sin_addr.s_addr == -1) { | |
305 | if (!(hp = gethostbyname(host))) { | |
306 | fprintf(stderr, "arp: %s: ", host); | |
307 | herror((char *)NULL); | |
308 | exit(1); | |
309 | } | |
310 | bcopy((char *)hp->h_addr, (char *)&sin->sin_addr, | |
311 | sizeof sin->sin_addr); | |
312 | } | |
313 | dump(sin->sin_addr.s_addr); | |
314 | if (found_entry == 0) { | |
315 | printf("%s (%s) -- no entry\n", | |
316 | host, inet_ntoa(sin->sin_addr)); | |
317 | exit(1); | |
318 | } | |
319 | } | |
320 | ||
321 | /* | |
322 | * Delete an arp entry | |
323 | */ | |
324 | int | |
325 | delete(host, info) | |
326 | char *host; | |
327 | char *info; | |
328 | { | |
329 | struct hostent *hp; | |
330 | register struct sockaddr_inarp *sin = &sin_m; | |
331 | register struct rt_msghdr *rtm = &m_rtmsg.m_rtm; | |
332 | struct sockaddr_dl *sdl; | |
333 | ||
334 | if (info && strncmp(info, "pro", 3) ) | |
335 | export_only = 1; | |
336 | getsocket(); | |
337 | sin_m = blank_sin; | |
338 | sin->sin_addr.s_addr = inet_addr(host); | |
339 | if (sin->sin_addr.s_addr == -1) { | |
340 | if (!(hp = gethostbyname(host))) { | |
341 | fprintf(stderr, "arp: %s: ", host); | |
342 | herror((char *)NULL); | |
343 | return (1); | |
344 | } | |
345 | bcopy((char *)hp->h_addr, (char *)&sin->sin_addr, | |
346 | sizeof sin->sin_addr); | |
347 | } | |
348 | tryagain: | |
349 | if (rtmsg(RTM_GET) < 0) { | |
350 | perror(host); | |
351 | return (1); | |
352 | } | |
353 | sin = (struct sockaddr_inarp *)(rtm + 1); | |
354 | sdl = (struct sockaddr_dl *)(sin->sin_len + (char *)sin); | |
355 | if (sin->sin_addr.s_addr == sin_m.sin_addr.s_addr) { | |
356 | if (sdl->sdl_family == AF_LINK && | |
357 | (rtm->rtm_flags & RTF_LLINFO) && | |
358 | !(rtm->rtm_flags & RTF_GATEWAY)) switch (sdl->sdl_type) { | |
359 | case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023: | |
360 | case IFT_ISO88024: case IFT_ISO88025: | |
361 | goto delete; | |
362 | } | |
363 | } | |
364 | if (sin_m.sin_other & SIN_PROXY) { | |
365 | fprintf(stderr, "delete: can't locate %s\n",host); | |
366 | return (1); | |
367 | } else { | |
368 | sin_m.sin_other = SIN_PROXY; | |
369 | goto tryagain; | |
370 | } | |
371 | delete: | |
372 | if (sdl->sdl_family != AF_LINK) { | |
373 | printf("cannot locate %s\n", host); | |
374 | return (1); | |
375 | } | |
376 | if (rtmsg(RTM_DELETE)) | |
377 | return (1); | |
378 | printf("%s (%s) deleted\n", host, inet_ntoa(sin->sin_addr)); | |
379 | return (0); | |
380 | } | |
381 | ||
382 | /* | |
383 | * Dump the entire arp table | |
384 | */ | |
385 | void | |
386 | dump(addr) | |
387 | u_long addr; | |
388 | { | |
389 | int mib[6]; | |
390 | size_t needed; | |
391 | char *host, *lim, *buf, *next; | |
392 | struct rt_msghdr *rtm; | |
393 | struct sockaddr_inarp *sin; | |
394 | struct sockaddr_dl *sdl; | |
395 | extern int h_errno; | |
396 | struct hostent *hp; | |
397 | ||
398 | mib[0] = CTL_NET; | |
399 | mib[1] = PF_ROUTE; | |
400 | mib[2] = 0; | |
401 | mib[3] = AF_INET; | |
402 | mib[4] = NET_RT_FLAGS; | |
403 | mib[5] = RTF_LLINFO; | |
404 | if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) | |
405 | err(1, "route-sysctl-estimate"); | |
406 | if ((buf = malloc(needed)) == NULL) | |
407 | err(1, "malloc"); | |
408 | if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) | |
409 | err(1, "actual retrieval of routing table"); | |
410 | lim = buf + needed; | |
411 | for (next = buf; next < lim; next += rtm->rtm_msglen) { | |
412 | rtm = (struct rt_msghdr *)next; | |
413 | sin = (struct sockaddr_inarp *)(rtm + 1); | |
414 | sdl = (struct sockaddr_dl *)(sin + 1); | |
415 | if (addr) { | |
416 | if (addr != sin->sin_addr.s_addr) | |
417 | continue; | |
418 | found_entry = 1; | |
419 | } | |
420 | if (nflag == 0) | |
421 | hp = gethostbyaddr((caddr_t)&(sin->sin_addr), | |
422 | sizeof sin->sin_addr, AF_INET); | |
423 | else | |
424 | hp = 0; | |
425 | if (hp) | |
426 | host = hp->h_name; | |
427 | else { | |
428 | host = "?"; | |
429 | if (h_errno == TRY_AGAIN) | |
430 | nflag = 1; | |
431 | } | |
432 | printf("%s (%s) at ", host, inet_ntoa(sin->sin_addr)); | |
433 | if (sdl->sdl_alen) | |
434 | ether_print((u_char *)LLADDR(sdl)); | |
435 | else | |
436 | printf("(incomplete)"); | |
437 | if (rtm->rtm_rmx.rmx_expire == 0) | |
438 | printf(" permanent"); | |
439 | if (sin->sin_other & SIN_PROXY) | |
440 | printf(" published (proxy only)"); | |
441 | if (rtm->rtm_addrs & RTA_NETMASK) { | |
442 | sin = (struct sockaddr_inarp *) | |
443 | (sdl->sdl_len + (char *)sdl); | |
444 | if (sin->sin_addr.s_addr == 0xffffffff) | |
445 | printf(" published"); | |
446 | if (sin->sin_len != 8) | |
447 | printf("(wierd)"); | |
448 | } | |
449 | printf("\n"); | |
450 | } | |
451 | } | |
452 | ||
453 | void | |
454 | ether_print(cp) | |
455 | u_char *cp; | |
456 | { | |
457 | printf("%x:%x:%x:%x:%x:%x", cp[0], cp[1], cp[2], cp[3], cp[4], cp[5]); | |
458 | } | |
459 | ||
460 | int | |
461 | ether_aton(a, n) | |
462 | char *a; | |
463 | u_char *n; | |
464 | { | |
465 | int i, o[6]; | |
466 | ||
467 | i = sscanf(a, "%x:%x:%x:%x:%x:%x", &o[0], &o[1], &o[2], | |
468 | &o[3], &o[4], &o[5]); | |
469 | if (i != 6) { | |
470 | fprintf(stderr, "arp: invalid Ethernet address '%s'\n", a); | |
471 | return (1); | |
472 | } | |
473 | for (i=0; i<6; i++) | |
474 | n[i] = o[i]; | |
475 | return (0); | |
476 | } | |
477 | ||
478 | void | |
479 | usage() | |
480 | { | |
481 | printf("usage: arp hostname\n"); | |
482 | printf(" arp -a [kernel] [kernel_memory]\n"); | |
483 | printf(" arp -d hostname\n"); | |
484 | printf(" arp -s hostname ether_addr [temp] [pub]\n"); | |
485 | printf(" arp -f filename\n"); | |
486 | exit(1); | |
487 | } | |
488 | ||
489 | int | |
490 | rtmsg(cmd) | |
491 | int cmd; | |
492 | { | |
493 | static int seq; | |
494 | int rlen; | |
495 | register struct rt_msghdr *rtm = &m_rtmsg.m_rtm; | |
496 | register char *cp = m_rtmsg.m_space; | |
497 | register int l; | |
498 | ||
499 | errno = 0; | |
500 | if (cmd == RTM_DELETE) | |
501 | goto doit; | |
502 | bzero((char *)&m_rtmsg, sizeof(m_rtmsg)); | |
503 | rtm->rtm_flags = flags; | |
504 | rtm->rtm_version = RTM_VERSION; | |
505 | ||
506 | switch (cmd) { | |
507 | default: | |
508 | fprintf(stderr, "arp: internal wrong cmd\n"); | |
509 | exit(1); | |
510 | case RTM_ADD: | |
511 | rtm->rtm_addrs |= RTA_GATEWAY; | |
512 | rtm->rtm_rmx.rmx_expire = expire_time; | |
513 | rtm->rtm_inits = RTV_EXPIRE; | |
514 | rtm->rtm_flags |= (RTF_HOST | RTF_STATIC); | |
515 | sin_m.sin_other = 0; | |
516 | if (doing_proxy) { | |
517 | if (export_only) | |
518 | sin_m.sin_other = SIN_PROXY; | |
519 | else { | |
520 | rtm->rtm_addrs |= RTA_NETMASK; | |
521 | rtm->rtm_flags &= ~RTF_HOST; | |
522 | } | |
523 | } | |
524 | /* FALLTHROUGH */ | |
525 | case RTM_GET: | |
526 | rtm->rtm_addrs |= RTA_DST; | |
527 | } | |
528 | #define NEXTADDR(w, s) \ | |
529 | if (rtm->rtm_addrs & (w)) { \ | |
530 | bcopy((char *)&s, cp, sizeof(s)); cp += sizeof(s);} | |
531 | ||
532 | NEXTADDR(RTA_DST, sin_m); | |
533 | NEXTADDR(RTA_GATEWAY, sdl_m); | |
534 | NEXTADDR(RTA_NETMASK, so_mask); | |
535 | ||
536 | rtm->rtm_msglen = cp - (char *)&m_rtmsg; | |
537 | doit: | |
538 | l = rtm->rtm_msglen; | |
539 | rtm->rtm_seq = ++seq; | |
540 | rtm->rtm_type = cmd; | |
541 | if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) { | |
542 | if (errno != ESRCH || cmd != RTM_DELETE) { | |
543 | perror("writing to routing socket"); | |
544 | return (-1); | |
545 | } | |
546 | } | |
547 | do { | |
548 | l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg)); | |
549 | } while (l > 0 && (rtm->rtm_seq != seq || rtm->rtm_pid != pid)); | |
550 | if (l < 0) | |
551 | (void) fprintf(stderr, "arp: read from routing socket: %s\n", | |
552 | strerror(errno)); | |
553 | return (0); | |
554 | } |