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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1984 Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * This code is derived from software contributed to Berkeley by | |
6 | * Sun Microsystems, Inc. | |
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. All advertising materials mentioning features or use of this software | |
17 | * must display the following acknowledgement: | |
18 | * This product includes software developed by the University of | |
19 | * California, Berkeley and its contributors. | |
20 | * 4. Neither the name of the University nor the names of its contributors | |
21 | * may be used to endorse or promote products derived from this software | |
22 | * without specific prior written permission. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
34 | * SUCH DAMAGE. | |
35 | */ | |
36 | ||
37 | #ifndef lint | |
38 | char copyright[] = | |
39 | "@(#) Copyright (c) 1984 Regents of the University of California.\n\ | |
40 | All rights reserved.\n"; | |
41 | #endif /* not lint */ | |
42 | ||
43 | #ifndef lint | |
44 | static char sccsid[] = "@(#)arp.c 5.11.1.1 (Berkeley) 7/22/91"; | |
45 | #endif /* not lint */ | |
46 | ||
47 | /* | |
48 | * arp - display, set, and delete arp table entries | |
49 | */ | |
50 | ||
51 | #include <sys/param.h> | |
52 | #include <sys/file.h> | |
53 | #include <sys/socket.h> | |
54 | #include <sys/ioctl.h> | |
55 | ||
56 | #include <netdb.h> | |
57 | #include <netinet/in.h> | |
58 | #include <net/if.h> | |
59 | #include <netinet/if_ether.h> | |
60 | ||
61 | #include <errno.h> | |
62 | #include <nlist.h> | |
63 | #include <kvm.h> | |
64 | #include <stdio.h> | |
65 | #include <paths.h> | |
66 | ||
67 | extern int errno; | |
68 | ||
69 | main(argc, argv) | |
70 | int argc; | |
71 | char **argv; | |
72 | { | |
73 | int ch; | |
74 | ||
75 | while ((ch = getopt(argc, argv, "adsf")) != EOF) | |
76 | switch((char)ch) { | |
77 | case 'a': { | |
78 | char *mem = 0; | |
79 | ||
80 | if (argc > 4) | |
81 | usage(); | |
82 | if (argc == 4) { | |
83 | mem = argv[3]; | |
84 | } | |
85 | dump((argc >= 3) ? argv[2] : _PATH_UNIX, mem); | |
86 | exit(0); | |
87 | } | |
88 | case 'd': | |
89 | if (argc != 3) | |
90 | usage(); | |
91 | delete(argv[2]); | |
92 | exit(0); | |
93 | case 's': | |
94 | if (argc < 4 || argc > 7) | |
95 | usage(); | |
96 | exit(set(argc-2, &argv[2]) ? 1 : 0); | |
97 | case 'f': | |
98 | if (argc != 3) | |
99 | usage(); | |
100 | exit (file(argv[2]) ? 1 : 0); | |
101 | case '?': | |
102 | default: | |
103 | usage(); | |
104 | } | |
105 | if (argc != 2) | |
106 | usage(); | |
107 | get(argv[1]); | |
108 | exit(0); | |
109 | } | |
110 | ||
111 | /* | |
112 | * Process a file to set standard arp entries | |
113 | */ | |
114 | file(name) | |
115 | char *name; | |
116 | { | |
117 | FILE *fp; | |
118 | int i, retval; | |
119 | char line[100], arg[5][50], *args[5]; | |
120 | ||
121 | if ((fp = fopen(name, "r")) == NULL) { | |
122 | fprintf(stderr, "arp: cannot open %s\n", name); | |
123 | exit(1); | |
124 | } | |
125 | args[0] = &arg[0][0]; | |
126 | args[1] = &arg[1][0]; | |
127 | args[2] = &arg[2][0]; | |
128 | args[3] = &arg[3][0]; | |
129 | args[4] = &arg[4][0]; | |
130 | retval = 0; | |
131 | while(fgets(line, 100, fp) != NULL) { | |
132 | i = sscanf(line, "%s %s %s %s %s", arg[0], arg[1], arg[2], | |
133 | arg[3], arg[4]); | |
134 | if (i < 2) { | |
135 | fprintf(stderr, "arp: bad line: %s\n", line); | |
136 | retval = 1; | |
137 | continue; | |
138 | } | |
139 | if (set(i, args)) | |
140 | retval = 1; | |
141 | } | |
142 | fclose(fp); | |
143 | return (retval); | |
144 | } | |
145 | ||
146 | /* | |
147 | * Set an individual arp entry | |
148 | */ | |
149 | set(argc, argv) | |
150 | int argc; | |
151 | char **argv; | |
152 | { | |
153 | struct arpreq ar; | |
154 | struct hostent *hp; | |
155 | struct sockaddr_in *sin; | |
156 | u_char *ea; | |
157 | int s; | |
158 | char *host = argv[0], *eaddr = argv[1]; | |
159 | ||
160 | argc -= 2; | |
161 | argv += 2; | |
162 | bzero((caddr_t)&ar, sizeof ar); | |
163 | sin = (struct sockaddr_in *)&ar.arp_pa; | |
164 | sin->sin_family = AF_INET; | |
165 | sin->sin_addr.s_addr = inet_addr(host); | |
166 | if (sin->sin_addr.s_addr == -1) { | |
167 | if (!(hp = gethostbyname(host))) { | |
168 | fprintf(stderr, "arp: %s: ", host); | |
169 | herror((char *)NULL); | |
170 | return (1); | |
171 | } | |
172 | bcopy((char *)hp->h_addr, (char *)&sin->sin_addr, | |
173 | sizeof sin->sin_addr); | |
174 | } | |
175 | ea = (u_char *)ar.arp_ha.sa_data; | |
176 | if (ether_aton(eaddr, ea)) | |
177 | return (1); | |
178 | ar.arp_flags = ATF_PERM; | |
179 | while (argc-- > 0) { | |
180 | if (strncmp(argv[0], "temp", 4) == 0) | |
181 | ar.arp_flags &= ~ATF_PERM; | |
182 | else if (strncmp(argv[0], "pub", 3) == 0) | |
183 | ar.arp_flags |= ATF_PUBL; | |
184 | else if (strncmp(argv[0], "trail", 5) == 0) | |
185 | ar.arp_flags |= ATF_USETRAILERS; | |
186 | argv++; | |
187 | } | |
188 | ||
189 | s = socket(AF_INET, SOCK_DGRAM, 0); | |
190 | if (s < 0) { | |
191 | perror("arp: socket"); | |
192 | exit(1); | |
193 | } | |
194 | if (ioctl(s, SIOCSARP, (caddr_t)&ar) < 0) { | |
195 | perror(host); | |
196 | exit(1); | |
197 | } | |
198 | close(s); | |
199 | return (0); | |
200 | } | |
201 | ||
202 | /* | |
203 | * Display an individual arp entry | |
204 | */ | |
205 | get(host) | |
206 | char *host; | |
207 | { | |
208 | struct arpreq ar; | |
209 | struct hostent *hp; | |
210 | struct sockaddr_in *sin; | |
211 | u_char *ea; | |
212 | int s; | |
213 | char *inet_ntoa(); | |
214 | ||
215 | bzero((caddr_t)&ar, sizeof ar); | |
216 | ar.arp_pa.sa_family = AF_INET; | |
217 | sin = (struct sockaddr_in *)&ar.arp_pa; | |
218 | sin->sin_family = AF_INET; | |
219 | sin->sin_addr.s_addr = inet_addr(host); | |
220 | if (sin->sin_addr.s_addr == -1) { | |
221 | if (!(hp = gethostbyname(host))) { | |
222 | fprintf(stderr, "arp: %s: ", host); | |
223 | herror((char *)NULL); | |
224 | exit(1); | |
225 | } | |
226 | bcopy((char *)hp->h_addr, (char *)&sin->sin_addr, | |
227 | sizeof sin->sin_addr); | |
228 | } | |
229 | s = socket(AF_INET, SOCK_DGRAM, 0); | |
230 | if (s < 0) { | |
231 | perror("arp: socket"); | |
232 | exit(1); | |
233 | } | |
234 | if (ioctl(s, SIOCGARP, (caddr_t)&ar) < 0) { | |
235 | if (errno == ENXIO) | |
236 | printf("%s (%s) -- no entry\n", | |
237 | host, inet_ntoa(sin->sin_addr)); | |
238 | else | |
239 | perror("SIOCGARP"); | |
240 | exit(1); | |
241 | } | |
242 | close(s); | |
243 | ea = (u_char *)ar.arp_ha.sa_data; | |
244 | printf("%s (%s) at ", host, inet_ntoa(sin->sin_addr)); | |
245 | if (ar.arp_flags & ATF_COM) | |
246 | ether_print(ea); | |
247 | else | |
248 | printf("(incomplete)"); | |
249 | if (ar.arp_flags & ATF_PERM) | |
250 | printf(" permanent"); | |
251 | if (ar.arp_flags & ATF_PUBL) | |
252 | printf(" published"); | |
253 | if (ar.arp_flags & ATF_USETRAILERS) | |
254 | printf(" trailers"); | |
255 | printf("\n"); | |
256 | } | |
257 | ||
258 | /* | |
259 | * Delete an arp entry | |
260 | */ | |
261 | delete(host) | |
262 | char *host; | |
263 | { | |
264 | struct arpreq ar; | |
265 | struct hostent *hp; | |
266 | struct sockaddr_in *sin; | |
267 | int s; | |
268 | ||
269 | bzero((caddr_t)&ar, sizeof ar); | |
270 | ar.arp_pa.sa_family = AF_INET; | |
271 | sin = (struct sockaddr_in *)&ar.arp_pa; | |
272 | sin->sin_family = AF_INET; | |
273 | sin->sin_addr.s_addr = inet_addr(host); | |
274 | if (sin->sin_addr.s_addr == -1) { | |
275 | if (!(hp = gethostbyname(host))) { | |
276 | fprintf(stderr, "arp: %s: ", host); | |
277 | herror((char *)NULL); | |
278 | exit(1); | |
279 | } | |
280 | bcopy((char *)hp->h_addr, (char *)&sin->sin_addr, | |
281 | sizeof sin->sin_addr); | |
282 | } | |
283 | s = socket(AF_INET, SOCK_DGRAM, 0); | |
284 | if (s < 0) { | |
285 | perror("arp: socket"); | |
286 | exit(1); | |
287 | } | |
288 | if (ioctl(s, SIOCDARP, (caddr_t)&ar) < 0) { | |
289 | if (errno == ENXIO) | |
290 | printf("%s (%s) -- no entry\n", | |
291 | host, inet_ntoa(sin->sin_addr)); | |
292 | else | |
293 | perror("SIOCDARP"); | |
294 | exit(1); | |
295 | } | |
296 | close(s); | |
297 | printf("%s (%s) deleted\n", host, inet_ntoa(sin->sin_addr)); | |
298 | } | |
299 | ||
300 | struct nlist nl[] = { | |
301 | #define X_ARPTAB 0 | |
302 | { "_arptab" }, | |
303 | #define X_ARPTAB_SIZE 1 | |
304 | { "_arptab_size" }, | |
305 | { "" }, | |
306 | }; | |
307 | ||
308 | /* | |
309 | * Dump the entire arp table | |
310 | */ | |
311 | dump(kernel, mem) | |
312 | char *kernel, *mem; | |
313 | { | |
314 | extern int h_errno; | |
315 | struct arptab *at; | |
316 | struct hostent *hp; | |
317 | int bynumber, mf, arptab_size, sz; | |
318 | char *host, *malloc(); | |
319 | off_t lseek(); | |
320 | ||
321 | if (kvm_openfiles(kernel, mem, NULL) == -1) { | |
322 | fprintf(stderr, "arp: kvm_openfiles: %s\n", kvm_geterr()); | |
323 | exit(1); | |
324 | } | |
325 | if (kvm_nlist(nl) < 0 || nl[X_ARPTAB_SIZE].n_type == 0) { | |
326 | fprintf(stderr, "arp: %s: bad namelist\n", kernel); | |
327 | exit(1); | |
328 | } | |
329 | if (kvm_read((void *)(nl[X_ARPTAB_SIZE].n_value), | |
330 | &arptab_size, sizeof arptab_size) == -1 || | |
331 | arptab_size <= 0 || arptab_size > 1000) { | |
332 | fprintf(stderr, "arp: %s: namelist wrong\n", kernel); | |
333 | exit(1); | |
334 | } | |
335 | sz = arptab_size * sizeof (struct arptab); | |
336 | at = (struct arptab *)malloc((u_int)sz); | |
337 | if (at == NULL) { | |
338 | fputs("arp: can't get memory for arptab.\n", stderr); | |
339 | exit(1); | |
340 | } | |
341 | if (kvm_read((void *)(nl[X_ARPTAB].n_value), (char *)at, sz) == -1) { | |
342 | perror("arp: error reading arptab"); | |
343 | exit(1); | |
344 | } | |
345 | for (bynumber = 0; arptab_size-- > 0; at++) { | |
346 | if (at->at_iaddr.s_addr == 0 || at->at_flags == 0) | |
347 | continue; | |
348 | if (bynumber == 0) | |
349 | hp = gethostbyaddr((caddr_t)&at->at_iaddr, | |
350 | sizeof at->at_iaddr, AF_INET); | |
351 | else | |
352 | hp = 0; | |
353 | if (hp) | |
354 | host = hp->h_name; | |
355 | else { | |
356 | host = "?"; | |
357 | if (h_errno == TRY_AGAIN) | |
358 | bynumber = 1; | |
359 | } | |
360 | printf("%s (%s) at ", host, inet_ntoa(at->at_iaddr)); | |
361 | if (at->at_flags & ATF_COM) | |
362 | ether_print(at->at_enaddr); | |
363 | else | |
364 | printf("(incomplete)"); | |
365 | if (at->at_flags & ATF_PERM) | |
366 | printf(" permanent"); | |
367 | if (at->at_flags & ATF_PUBL) | |
368 | printf(" published"); | |
369 | if (at->at_flags & ATF_USETRAILERS) | |
370 | printf(" trailers"); | |
371 | printf("\n"); | |
372 | } | |
373 | } | |
374 | ||
375 | ether_print(cp) | |
376 | u_char *cp; | |
377 | { | |
378 | printf("%x:%x:%x:%x:%x:%x", cp[0], cp[1], cp[2], cp[3], cp[4], cp[5]); | |
379 | } | |
380 | ||
381 | ether_aton(a, n) | |
382 | char *a; | |
383 | u_char *n; | |
384 | { | |
385 | int i, o[6]; | |
386 | ||
387 | i = sscanf(a, "%x:%x:%x:%x:%x:%x", &o[0], &o[1], &o[2], | |
388 | &o[3], &o[4], &o[5]); | |
389 | if (i != 6) { | |
390 | fprintf(stderr, "arp: invalid Ethernet address '%s'\n", a); | |
391 | return (1); | |
392 | } | |
393 | for (i=0; i<6; i++) | |
394 | n[i] = o[i]; | |
395 | return (0); | |
396 | } | |
397 | ||
398 | usage() | |
399 | { | |
400 | printf("usage: arp hostname\n"); | |
401 | printf(" arp -a [kernel] [kernel_memory]\n"); | |
402 | printf(" arp -d hostname\n"); | |
403 | printf(" arp -s hostname ether_addr [temp] [pub] [trail]\n"); | |
404 | printf(" arp -f filename\n"); | |
405 | exit(1); | |
406 | } |