1
by Bernd Eckenfels
Import upstream version 1.60 |
1 |
/*
|
2 |
* arp This file contains an implementation of the command
|
|
3 |
* that maintains the kernel's ARP cache. It is derived
|
|
4 |
* from Berkeley UNIX arp(8), but cleaner and with sup-
|
|
5 |
* port for devices other than Ethernet.
|
|
6 |
*
|
|
7 |
* NET-TOOLS A collection of programs that form the base set of the
|
|
8 |
* NET-3 Networking Distribution for the LINUX operating
|
|
9 |
* system.
|
|
10 |
*
|
|
5
by Tollef Fog Heen
* Merge with Debian |
11 |
* Version: $Id: arp.c,v 1.24 2005/05/16 04:30:17 ecki Exp $
|
1
by Bernd Eckenfels
Import upstream version 1.60 |
12 |
*
|
13 |
* Maintainer: Bernd 'eckes' Eckenfels, <net-tools@lina.inka.de>
|
|
14 |
*
|
|
15 |
* Author: Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
|
|
16 |
*
|
|
17 |
* Changes:
|
|
18 |
* (based on work from Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>)
|
|
19 |
* Alan Cox : modified for NET3
|
|
20 |
* Andrew Tridgell : proxy arp netmasks
|
|
21 |
* Bernd Eckenfels : -n option
|
|
22 |
* Bernd Eckenfels : Use only /proc for display
|
|
23 |
* {1.60} Bernd Eckenfels : new arpcode (-i) for 1.3.42 but works
|
|
24 |
* with 1.2.x, too
|
|
25 |
* {1.61} Bernd Eckenfels : more verbose messages
|
|
26 |
* {1.62} Bernd Eckenfels : check -t for hw adresses and try to
|
|
27 |
* explain EINVAL (jeff)
|
|
28 |
*970125 {1.63} Bernd Eckenfels : -a print hardwarename instead of tiltle
|
|
29 |
*970201 {1.64} Bernd Eckenfels : net-features.h support
|
|
30 |
*970203 {1.65} Bernd Eckenfels : "#define" in "#if",
|
|
31 |
* -H|-A additional to -t|-p
|
|
32 |
*970214 {1.66} Bernd Eckenfels : Fix optarg required for -H and -A
|
|
33 |
*970412 {1.67} Bernd Eckenfels : device=""; is default
|
|
34 |
*970514 {1.68} Bernd Eckenfels : -N and -D
|
|
35 |
*970517 {1.69} Bernd Eckenfels : usage() fixed
|
|
36 |
*970622 {1.70} Bernd Eckenfels : arp -d priv
|
|
37 |
*970106 {1.80} Bernd Eckenfels : new syntax without -D and with "dev <If>",
|
|
38 |
* ATF_MAGIC, ATF_DONTPUB support.
|
|
39 |
* Typo fix (Debian Bug#5728 Giuliano Procida)
|
|
40 |
*970803 {1.81} Bernd Eckenfels : removed junk comment line 1
|
|
41 |
*970925 {1.82} Bernd Eckenfels : include fix for libc6
|
|
42 |
*980213 (1.83) Phil Blundell: set ATF_COM on new entries
|
|
43 |
*980629 (1.84) Arnaldo Carvalho de Melo: gettext instead of catgets
|
|
44 |
*990101 {1.85} Bernd Eckenfels fixed usage and return codes
|
|
45 |
*990105 (1.86) Phil Blundell: don't ignore EINVAL in arp_set
|
|
46 |
*991121 (1.87) Bernd Eckenfels: yes --device has a mandatory arg
|
|
47 |
*010404 (1.88) Arnaldo Carvalho de Melo: use setlocale
|
|
48 |
*
|
|
49 |
* This program is free software; you can redistribute it
|
|
50 |
* and/or modify it under the terms of the GNU General
|
|
51 |
* Public License as published by the Free Software
|
|
52 |
* Foundation; either version 2 of the License, or (at
|
|
53 |
* your option) any later version.
|
|
54 |
*/
|
|
55 |
#include <sys/types.h> |
|
56 |
#include <sys/socket.h> |
|
57 |
#include <sys/ioctl.h> |
|
58 |
#include <net/if.h> |
|
59 |
/* #include <linux/netdevice.h> */
|
|
60 |
/* #include <linux/if_arp.h> */
|
|
61 |
#include <net/if_arp.h> |
|
62 |
#include <stdlib.h> |
|
63 |
#include <stdio.h> |
|
64 |
#include <errno.h> |
|
65 |
#include <ctype.h> |
|
66 |
#include <fcntl.h> |
|
67 |
#include <string.h> |
|
68 |
#include <getopt.h> |
|
69 |
#include <unistd.h> |
|
70 |
#include "net-support.h" |
|
71 |
#include "pathnames.h" |
|
72 |
#include "version.h" |
|
73 |
#include "config.h" |
|
74 |
#include "intl.h" |
|
75 |
#include "util.h" |
|
76 |
||
77 |
#define DFLT_AF "inet"
|
|
78 |
#define DFLT_HW "ether"
|
|
79 |
||
80 |
#define FEATURE_ARP
|
|
81 |
#include "lib/net-features.h" |
|
82 |
||
83 |
char *Release = RELEASE, *Version = "arp 1.88 (2001-04-04)"; |
|
84 |
||
85 |
int opt_n = 0; /* do not resolve addresses */ |
|
86 |
int opt_N = 0; /* use symbolic names */ |
|
87 |
int opt_v = 0; /* debugging output flag */ |
|
88 |
int opt_D = 0; /* HW-address is devicename */ |
|
89 |
int opt_e = 0; /* 0=BSD output, 1=new linux */ |
|
90 |
int opt_a = 0; /* all entries, substring match */ |
|
91 |
struct aftype *ap; /* current address family */ |
|
92 |
struct hwtype *hw; /* current hardware type */ |
|
93 |
int sockfd = 0; /* active socket descriptor */ |
|
94 |
int hw_set = 0; /* flag if hw-type was set (-H) */ |
|
95 |
char device[16] = ""; /* current device */ |
|
96 |
static void usage(void); |
|
97 |
||
98 |
/* Delete an entry from the ARP cache. */
|
|
99 |
static int arp_del(char **args) |
|
100 |
{
|
|
101 |
char host[128]; |
|
102 |
struct arpreq req; |
|
103 |
struct sockaddr sa; |
|
104 |
int flags = 0; |
|
3
by Bernd Eckenfels
* typo fix in po/de.po for german arp command output (Closes: Bug #176151) |
105 |
int deleted = 0; |
1
by Bernd Eckenfels
Import upstream version 1.60 |
106 |
|
107 |
memset((char *) &req, 0, sizeof(req)); |
|
108 |
||
109 |
/* Resolve the host name. */
|
|
110 |
if (*args == NULL) { |
|
111 |
fprintf(stderr, _("arp: need host name\n")); |
|
112 |
return (-1); |
|
113 |
}
|
|
114 |
safe_strncpy(host, *args, (sizeof host)); |
|
115 |
if (ap->input(0, host, &sa) < 0) { |
|
116 |
ap->herror(host); |
|
117 |
return (-1); |
|
118 |
}
|
|
119 |
/* If a host has more than one address, use the correct one! */
|
|
120 |
memcpy((char *) &req.arp_pa, (char *) &sa, sizeof(struct sockaddr)); |
|
121 |
||
122 |
if (hw_set) |
|
123 |
req.arp_ha.sa_family = hw->type; |
|
124 |
||
125 |
req.arp_flags = ATF_PERM; |
|
126 |
args++; |
|
127 |
while (*args != NULL) { |
|
128 |
if (opt_v) |
|
129 |
fprintf(stderr, "args=%s\n", *args); |
|
130 |
if (!strcmp(*args, "pub")) { |
|
131 |
flags |= 1; |
|
132 |
args++; |
|
133 |
continue; |
|
134 |
}
|
|
135 |
if (!strcmp(*args, "priv")) { |
|
136 |
flags |= 2; |
|
137 |
args++; |
|
138 |
continue; |
|
139 |
}
|
|
140 |
if (!strcmp(*args, "temp")) { |
|
141 |
req.arp_flags &= ~ATF_PERM; |
|
142 |
args++; |
|
143 |
continue; |
|
144 |
}
|
|
145 |
if (!strcmp(*args, "trail")) { |
|
146 |
req.arp_flags |= ATF_USETRAILERS; |
|
147 |
args++; |
|
148 |
continue; |
|
149 |
}
|
|
150 |
if (!strcmp(*args, "dontpub")) { |
|
4
by Ian Jackson
Look up TCP/UDP protocol numbers using correct protocol, not |
151 |
#ifdef ATF_DONTPUB
|
1
by Bernd Eckenfels
Import upstream version 1.60 |
152 |
req.arp_flags |= ATF_DONTPUB; |
153 |
#else
|
|
154 |
ENOSUPP("arp", "ATF_DONTPUB"); |
|
155 |
#endif
|
|
156 |
args++; |
|
157 |
continue; |
|
158 |
}
|
|
159 |
if (!strcmp(*args, "auto")) { |
|
4
by Ian Jackson
Look up TCP/UDP protocol numbers using correct protocol, not |
160 |
#ifdef ATF_MAGIC
|
1
by Bernd Eckenfels
Import upstream version 1.60 |
161 |
req.arp_flags |= ATF_MAGIC; |
162 |
#else
|
|
163 |
ENOSUPP("arp", "ATF_MAGIC"); |
|
164 |
#endif
|
|
165 |
args++; |
|
166 |
continue; |
|
167 |
}
|
|
168 |
if (!strcmp(*args, "dev")) { |
|
169 |
if (*++args == NULL) |
|
170 |
usage(); |
|
171 |
safe_strncpy(device, *args, sizeof(device)); |
|
172 |
args++; |
|
173 |
continue; |
|
174 |
}
|
|
175 |
if (!strcmp(*args, "netmask")) { |
|
176 |
if (*++args == NULL) |
|
177 |
usage(); |
|
178 |
if (strcmp(*args, "255.255.255.255") != 0) { |
|
179 |
strcpy(host, *args); |
|
180 |
if (ap->input(0, host, &sa) < 0) { |
|
181 |
ap->herror(host); |
|
182 |
return (-1); |
|
183 |
}
|
|
184 |
memcpy((char *) &req.arp_netmask, (char *) &sa, |
|
185 |
sizeof(struct sockaddr)); |
|
186 |
req.arp_flags |= ATF_NETMASK; |
|
187 |
}
|
|
188 |
args++; |
|
189 |
continue; |
|
190 |
}
|
|
191 |
usage(); |
|
192 |
}
|
|
3
by Bernd Eckenfels
* typo fix in po/de.po for german arp command output (Closes: Bug #176151) |
193 |
|
194 |
// if neighter priv nor pub is given, work on both
|
|
1
by Bernd Eckenfels
Import upstream version 1.60 |
195 |
if (flags == 0) |
196 |
flags = 3; |
|
197 |
||
198 |
strcpy(req.arp_dev, device); |
|
199 |
||
3
by Bernd Eckenfels
* typo fix in po/de.po for german arp command output (Closes: Bug #176151) |
200 |
/* unfortuatelly the kernel interface does not allow us to
|
201 |
delete private entries anlone, so we need this hack
|
|
202 |
to avoid "not found" errors if we try both. */
|
|
203 |
deleted = 0; |
|
1
by Bernd Eckenfels
Import upstream version 1.60 |
204 |
|
205 |
/* Call the kernel. */
|
|
206 |
if (flags & 2) { |
|
207 |
if (opt_v) |
|
4
by Ian Jackson
Look up TCP/UDP protocol numbers using correct protocol, not |
208 |
fprintf(stderr, "arp: SIOCDARP(dontpub)\n"); |
3
by Bernd Eckenfels
* typo fix in po/de.po for german arp command output (Closes: Bug #176151) |
209 |
if (ioctl(sockfd, SIOCDARP, &req) < 0) { |
210 |
if ((errno == ENXIO) || (errno == ENOENT)) { |
|
1
by Bernd Eckenfels
Import upstream version 1.60 |
211 |
if (flags & 1) |
4
by Ian Jackson
Look up TCP/UDP protocol numbers using correct protocol, not |
212 |
goto dontpub; |
1
by Bernd Eckenfels
Import upstream version 1.60 |
213 |
printf(_("No ARP entry for %s\n"), host); |
214 |
return (-1); |
|
215 |
}
|
|
4
by Ian Jackson
Look up TCP/UDP protocol numbers using correct protocol, not |
216 |
perror("SIOCDARP(dontpub)"); |
1
by Bernd Eckenfels
Import upstream version 1.60 |
217 |
return (-1); |
3
by Bernd Eckenfels
* typo fix in po/de.po for german arp command output (Closes: Bug #176151) |
218 |
} else |
219 |
deleted = 1; |
|
1
by Bernd Eckenfels
Import upstream version 1.60 |
220 |
}
|
3
by Bernd Eckenfels
* typo fix in po/de.po for german arp command output (Closes: Bug #176151) |
221 |
if (!deleted && (flags & 1)) { |
4
by Ian Jackson
Look up TCP/UDP protocol numbers using correct protocol, not |
222 |
dontpub: |
1
by Bernd Eckenfels
Import upstream version 1.60 |
223 |
req.arp_flags |= ATF_PUBL; |
224 |
if (opt_v) |
|
225 |
fprintf(stderr, "arp: SIOCDARP(pub)\n"); |
|
226 |
if (ioctl(sockfd, SIOCDARP, &req) < 0) { |
|
3
by Bernd Eckenfels
* typo fix in po/de.po for german arp command output (Closes: Bug #176151) |
227 |
if ((errno == ENXIO) || (errno == ENOENT)) { |
1
by Bernd Eckenfels
Import upstream version 1.60 |
228 |
printf(_("No ARP entry for %s\n"), host); |
229 |
return (-1); |
|
230 |
}
|
|
231 |
perror("SIOCDARP(pub)"); |
|
232 |
return (-1); |
|
233 |
}
|
|
234 |
}
|
|
235 |
return (0); |
|
236 |
}
|
|
237 |
||
238 |
/* Get the hardware address to a specified interface name */
|
|
239 |
static int arp_getdevhw(char *ifname, struct sockaddr *sa, struct hwtype *hw) |
|
240 |
{
|
|
241 |
struct ifreq ifr; |
|
242 |
struct hwtype *xhw; |
|
243 |
||
244 |
strcpy(ifr.ifr_name, ifname); |
|
245 |
if (ioctl(sockfd, SIOCGIFHWADDR, &ifr) < 0) { |
|
246 |
fprintf(stderr, _("arp: cant get HW-Address for `%s': %s.\n"), ifname, strerror(errno)); |
|
247 |
return (-1); |
|
248 |
}
|
|
249 |
if (hw && (ifr.ifr_hwaddr.sa_family != hw->type)) { |
|
250 |
fprintf(stderr, _("arp: protocol type mismatch.\n")); |
|
251 |
return (-1); |
|
252 |
}
|
|
253 |
memcpy((char *) sa, (char *) &(ifr.ifr_hwaddr), sizeof(struct sockaddr)); |
|
254 |
||
255 |
if (opt_v) { |
|
256 |
if (!(xhw = get_hwntype(ifr.ifr_hwaddr.sa_family)) || (xhw->print == 0)) { |
|
257 |
xhw = get_hwntype(-1); |
|
258 |
}
|
|
259 |
fprintf(stderr, _("arp: device `%s' has HW address %s `%s'.\n"), ifname, xhw->name, xhw->print((char *)&ifr.ifr_hwaddr.sa_data)); |
|
260 |
}
|
|
261 |
return (0); |
|
262 |
}
|
|
263 |
||
264 |
/* Set an entry in the ARP cache. */
|
|
265 |
static int arp_set(char **args) |
|
266 |
{
|
|
267 |
char host[128]; |
|
268 |
struct arpreq req; |
|
269 |
struct sockaddr sa; |
|
270 |
int flags; |
|
271 |
||
272 |
memset((char *) &req, 0, sizeof(req)); |
|
273 |
||
274 |
/* Resolve the host name. */
|
|
275 |
if (*args == NULL) { |
|
276 |
fprintf(stderr, _("arp: need host name\n")); |
|
277 |
return (-1); |
|
278 |
}
|
|
279 |
safe_strncpy(host, *args++, (sizeof host)); |
|
280 |
if (ap->input(0, host, &sa) < 0) { |
|
281 |
ap->herror(host); |
|
282 |
return (-1); |
|
283 |
}
|
|
284 |
/* If a host has more than one address, use the correct one! */
|
|
285 |
memcpy((char *) &req.arp_pa, (char *) &sa, sizeof(struct sockaddr)); |
|
286 |
||
287 |
/* Fetch the hardware address. */
|
|
288 |
if (*args == NULL) { |
|
289 |
fprintf(stderr, _("arp: need hardware address\n")); |
|
290 |
return (-1); |
|
291 |
}
|
|
292 |
if (opt_D) { |
|
293 |
if (arp_getdevhw(*args++, &req.arp_ha, hw_set ? hw : NULL) < 0) |
|
294 |
return (-1); |
|
295 |
} else { |
|
296 |
if (hw->input(*args++, &req.arp_ha) < 0) { |
|
297 |
fprintf(stderr, _("arp: invalid hardware address\n")); |
|
298 |
return (-1); |
|
299 |
}
|
|
300 |
}
|
|
301 |
||
302 |
/* Check out any modifiers. */
|
|
303 |
flags = ATF_PERM | ATF_COM; |
|
304 |
while (*args != NULL) { |
|
305 |
if (!strcmp(*args, "temp")) { |
|
306 |
flags &= ~ATF_PERM; |
|
307 |
args++; |
|
308 |
continue; |
|
309 |
}
|
|
310 |
if (!strcmp(*args, "pub")) { |
|
311 |
flags |= ATF_PUBL; |
|
312 |
args++; |
|
313 |
continue; |
|
314 |
}
|
|
315 |
if (!strcmp(*args, "priv")) { |
|
316 |
flags &= ~ATF_PUBL; |
|
317 |
args++; |
|
318 |
continue; |
|
319 |
}
|
|
320 |
if (!strcmp(*args, "trail")) { |
|
321 |
flags |= ATF_USETRAILERS; |
|
322 |
args++; |
|
323 |
continue; |
|
324 |
}
|
|
325 |
if (!strcmp(*args, "dontpub")) { |
|
4
by Ian Jackson
Look up TCP/UDP protocol numbers using correct protocol, not |
326 |
#ifdef ATF_DONTPUB
|
1
by Bernd Eckenfels
Import upstream version 1.60 |
327 |
flags |= ATF_DONTPUB; |
328 |
#else
|
|
329 |
ENOSUPP("arp", "ATF_DONTPUB"); |
|
330 |
#endif
|
|
331 |
args++; |
|
332 |
continue; |
|
333 |
}
|
|
334 |
if (!strcmp(*args, "auto")) { |
|
4
by Ian Jackson
Look up TCP/UDP protocol numbers using correct protocol, not |
335 |
#ifdef ATF_MAGIC
|
1
by Bernd Eckenfels
Import upstream version 1.60 |
336 |
flags |= ATF_MAGIC; |
337 |
#else
|
|
338 |
ENOSUPP("arp", "ATF_MAGIC"); |
|
339 |
#endif
|
|
340 |
args++; |
|
341 |
continue; |
|
342 |
}
|
|
343 |
if (!strcmp(*args, "dev")) { |
|
344 |
if (*++args == NULL) |
|
345 |
usage(); |
|
346 |
safe_strncpy(device, *args, sizeof(device)); |
|
347 |
args++; |
|
348 |
continue; |
|
349 |
}
|
|
350 |
if (!strcmp(*args, "netmask")) { |
|
351 |
if (*++args == NULL) |
|
352 |
usage(); |
|
353 |
if (strcmp(*args, "255.255.255.255") != 0) { |
|
354 |
strcpy(host, *args); |
|
355 |
if (ap->input(0, host, &sa) < 0) { |
|
356 |
ap->herror(host); |
|
357 |
return (-1); |
|
358 |
}
|
|
359 |
memcpy((char *) &req.arp_netmask, (char *) &sa, |
|
360 |
sizeof(struct sockaddr)); |
|
361 |
flags |= ATF_NETMASK; |
|
362 |
}
|
|
363 |
args++; |
|
364 |
continue; |
|
365 |
}
|
|
366 |
usage(); |
|
367 |
}
|
|
368 |
||
369 |
/* Fill in the remainder of the request. */
|
|
370 |
req.arp_flags = flags; |
|
371 |
||
372 |
strcpy(req.arp_dev, device); |
|
373 |
||
374 |
/* Call the kernel. */
|
|
375 |
if (opt_v) |
|
376 |
fprintf(stderr, "arp: SIOCSARP()\n"); |
|
377 |
if (ioctl(sockfd, SIOCSARP, &req) < 0) { |
|
378 |
perror("SIOCSARP"); |
|
379 |
return (-1); |
|
380 |
}
|
|
381 |
return (0); |
|
382 |
}
|
|
383 |
||
384 |
||
385 |
/* Process an EtherFile */
|
|
386 |
static int arp_file(char *name) |
|
387 |
{
|
|
388 |
char buff[1024]; |
|
389 |
char *sp, *args[32]; |
|
390 |
int linenr, argc; |
|
391 |
FILE *fp; |
|
392 |
||
393 |
if ((fp = fopen(name, "r")) == NULL) { |
|
394 |
fprintf(stderr, _("arp: cannot open etherfile %s !\n"), name); |
|
395 |
return (-1); |
|
396 |
}
|
|
397 |
/* Read the lines in the file. */
|
|
398 |
linenr = 0; |
|
399 |
while (fgets(buff, sizeof(buff), fp) != (char *) NULL) { |
|
400 |
linenr++; |
|
401 |
if (opt_v == 1) |
|
402 |
fprintf(stderr, ">> %s", buff); |
|
403 |
if ((sp = strchr(buff, '\n')) != (char *) NULL) |
|
404 |
*sp = '\0'; |
|
405 |
if (buff[0] == '#' || buff[0] == '\0') |
|
406 |
continue; |
|
407 |
||
408 |
argc = getargs(buff, args); |
|
409 |
if (argc < 2) { |
|
410 |
fprintf(stderr, _("arp: format error on line %u of etherfile %s !\n"), |
|
411 |
linenr, name); |
|
412 |
continue; |
|
413 |
}
|
|
414 |
if (strchr (args[0], ':') != NULL) { |
|
415 |
/* We have a correct ethers file, switch hw adress and hostname
|
|
416 |
for arp */
|
|
417 |
char *cp; |
|
418 |
cp = args[1]; |
|
419 |
args[1] = args[0]; |
|
420 |
args[0] = cp; |
|
421 |
}
|
|
422 |
if (arp_set(args) != 0) |
|
423 |
fprintf(stderr, _("arp: cannot set entry on line %u of etherfile %s !\n"), |
|
424 |
linenr, name); |
|
425 |
}
|
|
426 |
||
427 |
(void) fclose(fp); |
|
428 |
return (0); |
|
429 |
}
|
|
430 |
||
431 |
||
432 |
/* Print the contents of an ARP request block. */
|
|
433 |
static void arp_disp_2(char *name, int type, int arp_flags, char *hwa, char *mask, char *dev) |
|
434 |
{
|
|
435 |
static int title = 0; |
|
436 |
struct hwtype *xhw; |
|
437 |
char flags[10]; |
|
438 |
||
439 |
xhw = get_hwntype(type); |
|
440 |
if (xhw == NULL) |
|
441 |
xhw = get_hwtype(DFLT_HW); |
|
442 |
||
443 |
if (title++ == 0) { |
|
444 |
printf(_("Address HWtype HWaddress Flags Mask Iface\n")); |
|
445 |
}
|
|
446 |
/* Setup the flags. */
|
|
447 |
flags[0] = '\0'; |
|
448 |
if (arp_flags & ATF_COM) |
|
449 |
strcat(flags, "C"); |
|
450 |
if (arp_flags & ATF_PERM) |
|
451 |
strcat(flags, "M"); |
|
452 |
if (arp_flags & ATF_PUBL) |
|
453 |
strcat(flags, "P"); |
|
4
by Ian Jackson
Look up TCP/UDP protocol numbers using correct protocol, not |
454 |
#ifdef ATF_MAGIC
|
1
by Bernd Eckenfels
Import upstream version 1.60 |
455 |
if (arp_flags & ATF_MAGIC) |
456 |
strcat(flags, "A"); |
|
457 |
#endif
|
|
4
by Ian Jackson
Look up TCP/UDP protocol numbers using correct protocol, not |
458 |
#ifdef ATF_DONTPUB
|
1
by Bernd Eckenfels
Import upstream version 1.60 |
459 |
if (arp_flags & ATF_DONTPUB) |
460 |
strcat(flags, "!"); |
|
461 |
#endif
|
|
462 |
if (arp_flags & ATF_USETRAILERS) |
|
463 |
strcat(flags, "T"); |
|
464 |
||
465 |
if (!(arp_flags & ATF_NETMASK)) |
|
466 |
mask = ""; |
|
467 |
||
468 |
printf("%-23.23s ", name); |
|
469 |
||
470 |
if (!(arp_flags & ATF_COM)) { |
|
471 |
if (arp_flags & ATF_PUBL) |
|
3
by Bernd Eckenfels
* typo fix in po/de.po for german arp command output (Closes: Bug #176151) |
472 |
printf("%-8.8s%-20.20s", "*", _("<from_interface>")); |
1
by Bernd Eckenfels
Import upstream version 1.60 |
473 |
else
|
474 |
printf("%-8.8s%-20.20s", "", _("(incomplete)")); |
|
475 |
} else { |
|
476 |
printf("%-8.8s%-20.20s", xhw->name, hwa); |
|
477 |
}
|
|
478 |
||
479 |
printf("%-6.6s%-15.15s %s\n", flags, mask, dev); |
|
480 |
}
|
|
481 |
||
482 |
/* Print the contents of an ARP request block. */
|
|
483 |
static void arp_disp(char *name, char *ip, int type, int arp_flags, char *hwa, char *mask, char *dev) |
|
484 |
{
|
|
485 |
struct hwtype *xhw; |
|
486 |
||
487 |
xhw = get_hwntype(type); |
|
488 |
if (xhw == NULL) |
|
489 |
xhw = get_hwtype(DFLT_HW); |
|
490 |
||
491 |
printf(_("%s (%s) at "), name, ip); |
|
492 |
||
493 |
if (!(arp_flags & ATF_COM)) { |
|
494 |
if (arp_flags & ATF_PUBL) |
|
3
by Bernd Eckenfels
* typo fix in po/de.po for german arp command output (Closes: Bug #176151) |
495 |
printf("<from_interface> "); |
1
by Bernd Eckenfels
Import upstream version 1.60 |
496 |
else
|
497 |
printf(_("<incomplete> ")); |
|
498 |
} else { |
|
499 |
printf("%s [%s] ", hwa, xhw->name); |
|
500 |
}
|
|
501 |
||
502 |
if (arp_flags & ATF_NETMASK) |
|
503 |
printf(_("netmask %s "), mask); |
|
504 |
||
505 |
if (arp_flags & ATF_PERM) |
|
506 |
printf("PERM "); |
|
507 |
if (arp_flags & ATF_PUBL) |
|
3
by Bernd Eckenfels
* typo fix in po/de.po for german arp command output (Closes: Bug #176151) |
508 |
printf("PUB "); |
4
by Ian Jackson
Look up TCP/UDP protocol numbers using correct protocol, not |
509 |
#ifdef ATF_MAGIC
|
1
by Bernd Eckenfels
Import upstream version 1.60 |
510 |
if (arp_flags & ATF_MAGIC) |
511 |
printf("AUTO "); |
|
512 |
#endif
|
|
4
by Ian Jackson
Look up TCP/UDP protocol numbers using correct protocol, not |
513 |
#ifdef ATF_DONTPUB
|
1
by Bernd Eckenfels
Import upstream version 1.60 |
514 |
if (arp_flags & ATF_DONTPUB) |
515 |
printf("DONTPUB "); |
|
516 |
#endif
|
|
517 |
if (arp_flags & ATF_USETRAILERS) |
|
518 |
printf("TRAIL "); |
|
519 |
||
520 |
printf(_("on %s\n"), dev); |
|
521 |
}
|
|
522 |
||
523 |
||
524 |
/* Display the contents of the ARP cache in the kernel. */
|
|
525 |
static int arp_show(char *name) |
|
526 |
{
|
|
527 |
char host[100]; |
|
528 |
struct sockaddr sa; |
|
529 |
char ip[100]; |
|
530 |
char hwa[100]; |
|
531 |
char mask[100]; |
|
532 |
char line[200]; |
|
533 |
char dev[100]; |
|
534 |
int type, flags; |
|
535 |
FILE *fp; |
|
536 |
char *hostname; |
|
537 |
int num, entries = 0, showed = 0; |
|
538 |
||
539 |
host[0] = '\0'; |
|
540 |
||
541 |
if (name != NULL) { |
|
542 |
/* Resolve the host name. */
|
|
543 |
safe_strncpy(host, name, (sizeof host)); |
|
544 |
if (ap->input(0, host, &sa) < 0) { |
|
545 |
ap->herror(host); |
|
546 |
return (-1); |
|
547 |
}
|
|
548 |
safe_strncpy(host, ap->sprint(&sa, 1), sizeof(host)); |
|
549 |
}
|
|
550 |
/* Open the PROCps kernel table. */
|
|
551 |
if ((fp = fopen(_PATH_PROCNET_ARP, "r")) == NULL) { |
|
552 |
perror(_PATH_PROCNET_ARP); |
|
553 |
return (-1); |
|
554 |
}
|
|
555 |
/* Bypass header -- read until newline */
|
|
556 |
if (fgets(line, sizeof(line), fp) != (char *) NULL) { |
|
557 |
strcpy(mask, "-"); |
|
558 |
strcpy(dev, "-"); |
|
559 |
/* Read the ARP cache entries. */
|
|
560 |
for (; fgets(line, sizeof(line), fp);) { |
|
561 |
num = sscanf(line, "%s 0x%x 0x%x %100s %100s %100s\n", |
|
562 |
ip, &type, &flags, hwa, mask, dev); |
|
563 |
if (num < 4) |
|
564 |
break; |
|
565 |
||
566 |
entries++; |
|
567 |
/* if the user specified hw-type differs, skip it */
|
|
568 |
if (hw_set && (type != hw->type)) |
|
569 |
continue; |
|
570 |
||
571 |
/* if the user specified address differs, skip it */
|
|
572 |
if (host[0] && strcmp(ip, host)) |
|
573 |
continue; |
|
574 |
||
575 |
/* if the user specified device differs, skip it */
|
|
576 |
if (device[0] && strcmp(dev, device)) |
|
577 |
continue; |
|
578 |
||
579 |
showed++; |
|
580 |
/* This IS ugly but it works -be */
|
|
581 |
if (opt_n) |
|
582 |
hostname = "?"; |
|
583 |
else { |
|
584 |
if (ap->input(0, ip, &sa) < 0) |
|
585 |
hostname = ip; |
|
586 |
else
|
|
587 |
hostname = ap->sprint(&sa, opt_n | 0x8000); |
|
588 |
if (strcmp(hostname, ip) == 0) |
|
589 |
hostname = "?"; |
|
590 |
}
|
|
591 |
||
592 |
if (opt_e) |
|
593 |
arp_disp_2(hostname[0] == '?' ? ip : hostname, type, flags, hwa, mask, dev); |
|
594 |
else
|
|
595 |
arp_disp(hostname, ip, type, flags, hwa, mask, dev); |
|
596 |
}
|
|
597 |
}
|
|
598 |
if (opt_v) |
|
599 |
printf(_("Entries: %d\tSkipped: %d\tFound: %d\n"), entries, entries - showed, showed); |
|
600 |
||
601 |
if (!showed) { |
|
602 |
if (host[0] && !opt_a) |
|
603 |
printf(_("%s (%s) -- no entry\n"), name, host); |
|
604 |
else if (hw_set || host[0] || device[0]) { |
|
605 |
printf(_("arp: in %d entries no match found.\n"), entries); |
|
606 |
}
|
|
607 |
}
|
|
608 |
(void) fclose(fp); |
|
609 |
return (0); |
|
610 |
}
|
|
611 |
||
612 |
static void version(void) |
|
613 |
{
|
|
614 |
fprintf(stderr, "%s\n%s\n%s\n", Release, Version, Features); |
|
615 |
exit(E_VERSION); |
|
616 |
}
|
|
617 |
||
618 |
static void usage(void) |
|
619 |
{
|
|
620 |
fprintf(stderr, _("Usage:\n arp [-vn] [<HW>] [-i <if>] [-a] [<hostname>] <-Display ARP cache\n")); |
|
4
by Ian Jackson
Look up TCP/UDP protocol numbers using correct protocol, not |
621 |
fprintf(stderr, _(" arp [-v] [-i <if>] -d <host> [pub] <-Delete ARP entry\n")); |
3
by Bernd Eckenfels
* typo fix in po/de.po for german arp command output (Closes: Bug #176151) |
622 |
fprintf(stderr, _(" arp [-vnD] [<HW>] [-i <if>] -f [<filename>] <-Add entry from file\n")); |
4
by Ian Jackson
Look up TCP/UDP protocol numbers using correct protocol, not |
623 |
fprintf(stderr, _(" arp [-v] [<HW>] [-i <if>] -s <host> <hwaddr> [temp] <-Add entry\n")); |
624 |
fprintf(stderr, _(" arp [-v] [<HW>] [-i <if>] -Ds <host> <if> [netmask <nm>] pub <-''-\n\n")); |
|
1
by Bernd Eckenfels
Import upstream version 1.60 |
625 |
|
626 |
fprintf(stderr, _(" -a display (all) hosts in alternative (BSD) style\n")); |
|
627 |
fprintf(stderr, _(" -s, --set set a new ARP entry\n")); |
|
628 |
fprintf(stderr, _(" -d, --delete delete a specified entry\n")); |
|
629 |
fprintf(stderr, _(" -v, --verbose be verbose\n")); |
|
630 |
fprintf(stderr, _(" -n, --numeric don't resolve names\n")); |
|
631 |
fprintf(stderr, _(" -i, --device specify network interface (e.g. eth0)\n")); |
|
632 |
fprintf(stderr, _(" -D, --use-device read <hwaddr> from given device\n")); |
|
633 |
fprintf(stderr, _(" -A, -p, --protocol specify protocol family\n")); |
|
634 |
fprintf(stderr, _(" -f, --file read new entries from file or from /etc/ethers\n\n")); |
|
635 |
||
636 |
fprintf(stderr, _(" <HW>=Use '-H <hw>' to specify hardware address type. Default: %s\n"), DFLT_HW); |
|
637 |
fprintf(stderr, _(" List of possible hardware types (which support ARP):\n")); |
|
638 |
print_hwlist(1); /* 1 = ARPable */ |
|
639 |
exit(E_USAGE); |
|
640 |
}
|
|
641 |
||
642 |
int main(int argc, char **argv) |
|
643 |
{
|
|
644 |
int i, lop, what; |
|
645 |
struct option longopts[] = |
|
646 |
{
|
|
647 |
{"verbose", 0, 0, 'v'}, |
|
648 |
{"version", 0, 0, 'V'}, |
|
649 |
{"all", 0, 0, 'a'}, |
|
650 |
{"delete", 0, 0, 'd'}, |
|
651 |
{"file", 0, 0, 'f'}, |
|
652 |
{"numeric", 0, 0, 'n'}, |
|
653 |
{"set", 0, 0, 's'}, |
|
654 |
{"protocol", 1, 0, 'A'}, |
|
655 |
{"hw-type", 1, 0, 'H'}, |
|
656 |
{"device", 1, 0, 'i'}, |
|
657 |
{"help", 0, 0, 'h'}, |
|
658 |
{"use-device", 0, 0, 'D'}, |
|
659 |
{"symbolic", 0, 0, 'N'}, |
|
660 |
{NULL, 0, 0, 0} |
|
661 |
};
|
|
662 |
||
663 |
#if I18N
|
|
664 |
setlocale (LC_ALL, ""); |
|
665 |
bindtextdomain("net-tools", "/usr/share/locale"); |
|
666 |
textdomain("net-tools"); |
|
667 |
#endif
|
|
668 |
||
669 |
/* Initialize variables... */
|
|
670 |
if ((hw = get_hwtype(DFLT_HW)) == NULL) { |
|
671 |
fprintf(stderr, _("%s: hardware type not supported!\n"), DFLT_HW); |
|
672 |
return (-1); |
|
673 |
}
|
|
674 |
if ((ap = get_aftype(DFLT_AF)) == NULL) { |
|
675 |
fprintf(stderr, _("%s: address family not supported!\n"), DFLT_AF); |
|
676 |
return (-1); |
|
677 |
}
|
|
678 |
what = 0; |
|
679 |
||
680 |
/* Fetch the command-line arguments. */
|
|
681 |
/* opterr = 0; */
|
|
682 |
while ((i = getopt_long(argc, argv, "A:H:adfp:nsei:t:vh?DNV", longopts, &lop)) != EOF) |
|
683 |
switch (i) { |
|
684 |
case 'a': |
|
685 |
what = 1; |
|
686 |
opt_a = 1; |
|
687 |
break; |
|
688 |
case 'f': |
|
689 |
what = 2; |
|
690 |
break; |
|
691 |
case 'd': |
|
692 |
what = 3; |
|
693 |
break; |
|
694 |
case 's': |
|
695 |
what = 4; |
|
696 |
break; |
|
697 |
||
698 |
||
699 |
case 'e': |
|
700 |
opt_e = 1; |
|
701 |
break; |
|
702 |
case 'n': |
|
703 |
opt_n = FLAG_NUM; |
|
704 |
break; |
|
705 |
case 'D': |
|
706 |
opt_D = 1; |
|
707 |
break; |
|
708 |
case 'N': |
|
709 |
opt_N = FLAG_SYM; |
|
710 |
fprintf(stderr, _("arp: -N not yet supported.\n")); |
|
711 |
break; |
|
712 |
case 'v': |
|
713 |
opt_v = 1; |
|
714 |
break; |
|
715 |
||
716 |
case 'A': |
|
717 |
case 'p': |
|
718 |
ap = get_aftype(optarg); |
|
719 |
if (ap == NULL) { |
|
720 |
fprintf(stderr, _("arp: %s: unknown address family.\n"), |
|
721 |
optarg); |
|
722 |
exit(-1); |
|
723 |
}
|
|
724 |
break; |
|
725 |
case 'H': |
|
726 |
case 't': |
|
727 |
hw = get_hwtype(optarg); |
|
728 |
if (hw == NULL) { |
|
729 |
fprintf(stderr, _("arp: %s: unknown hardware type.\n"), |
|
730 |
optarg); |
|
731 |
exit(-1); |
|
732 |
}
|
|
733 |
hw_set = 1; |
|
734 |
break; |
|
735 |
case 'i': |
|
736 |
safe_strncpy(device, optarg, sizeof(device)); |
|
737 |
break; |
|
738 |
||
739 |
case 'V': |
|
740 |
version(); |
|
741 |
case '?': |
|
742 |
case 'h': |
|
743 |
default: |
|
744 |
usage(); |
|
745 |
}
|
|
746 |
||
747 |
if (ap->af != AF_INET) { |
|
748 |
fprintf(stderr, _("arp: %s: kernel only supports 'inet'.\n"), |
|
749 |
ap->name); |
|
750 |
exit(-1); |
|
751 |
}
|
|
752 |
||
753 |
/* If not hw type specified get default */
|
|
754 |
if(hw_set==0) |
|
755 |
if ((hw = get_hwtype(DFLT_HW)) == NULL) { |
|
756 |
fprintf(stderr, _("%s: hardware type not supported!\n"), DFLT_HW); |
|
757 |
return (-1); |
|
758 |
}
|
|
759 |
||
760 |
if (hw->alen <= 0) { |
|
761 |
fprintf(stderr, _("arp: %s: hardware type without ARP support.\n"), |
|
762 |
hw->name); |
|
763 |
exit(-1); |
|
764 |
}
|
|
765 |
if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { |
|
766 |
perror("socket"); |
|
767 |
exit(-1); |
|
768 |
}
|
|
769 |
/* Now see what we have to do here... */
|
|
770 |
switch (what) { |
|
771 |
case 0: |
|
772 |
opt_e = 1; |
|
773 |
what = arp_show(argv[optind]); |
|
774 |
break; |
|
775 |
||
776 |
case 1: /* show an ARP entry in the cache */ |
|
777 |
what = arp_show(argv[optind]); |
|
778 |
break; |
|
779 |
||
780 |
case 2: /* process an EtherFile */ |
|
781 |
what = arp_file(argv[optind] ? argv[optind] : "/etc/ethers"); |
|
782 |
break; |
|
783 |
||
784 |
case 3: /* delete an ARP entry from the cache */ |
|
785 |
what = arp_del(&argv[optind]); |
|
786 |
break; |
|
787 |
||
788 |
case 4: /* set an ARP entry in the cache */ |
|
789 |
what = arp_set(&argv[optind]); |
|
790 |
break; |
|
791 |
||
792 |
default: |
|
793 |
usage(); |
|
794 |
}
|
|
795 |
||
796 |
exit(what); |
|
797 |
}
|