[3320] | 1 | /* vi: set sw=4 ts=4: */
|
---|
| 2 | /*
|
---|
| 3 | * arp.c - Manipulate the system ARP cache
|
---|
| 4 | *
|
---|
| 5 | * This program is free software; you can redistribute it and/or
|
---|
| 6 | * modify it under the terms of the GNU General Public License
|
---|
| 7 | * as published by the Free Software Foundation; either version
|
---|
| 8 | * 2 of the License, or (at your option) any later version.
|
---|
| 9 | *
|
---|
| 10 | * Author: Fred N. van Kempen, <waltje at uwalt.nl.mugnet.org>
|
---|
| 11 | * Busybox port: Paul van Gool <pvangool at mimotech.com>
|
---|
| 12 | *
|
---|
| 13 | * modified for getopt32 by Arne Bernin <arne [at] alamut.de>
|
---|
| 14 | */
|
---|
| 15 |
|
---|
| 16 | #include "libbb.h"
|
---|
| 17 | #include "inet_common.h"
|
---|
| 18 |
|
---|
| 19 | #include <arpa/inet.h>
|
---|
| 20 | #include <net/if.h>
|
---|
| 21 | #include <net/if_arp.h>
|
---|
| 22 | #include <netinet/ether.h>
|
---|
| 23 | #include <netpacket/packet.h>
|
---|
| 24 |
|
---|
| 25 | #define DEBUG 0
|
---|
| 26 |
|
---|
| 27 | #define DFLT_AF "inet"
|
---|
| 28 | #define DFLT_HW "ether"
|
---|
| 29 |
|
---|
| 30 | enum {
|
---|
| 31 | ARP_OPT_A = (1 << 0),
|
---|
| 32 | ARP_OPT_p = (1 << 1),
|
---|
| 33 | ARP_OPT_H = (1 << 2),
|
---|
| 34 | ARP_OPT_t = (1 << 3),
|
---|
| 35 | ARP_OPT_i = (1 << 4),
|
---|
| 36 | ARP_OPT_a = (1 << 5),
|
---|
| 37 | ARP_OPT_d = (1 << 6),
|
---|
| 38 | ARP_OPT_n = (1 << 7), /* do not resolve addresses */
|
---|
| 39 | ARP_OPT_D = (1 << 8), /* HW-address is devicename */
|
---|
| 40 | ARP_OPT_s = (1 << 9),
|
---|
| 41 | ARP_OPT_v = (1 << 10) * DEBUG, /* debugging output flag */
|
---|
| 42 | };
|
---|
| 43 |
|
---|
| 44 | enum {
|
---|
| 45 | sockfd = 3, /* active socket descriptor */
|
---|
| 46 | };
|
---|
| 47 |
|
---|
| 48 | struct globals {
|
---|
| 49 | const struct aftype *ap; /* current address family */
|
---|
| 50 | const struct hwtype *hw; /* current hardware type */
|
---|
| 51 | const char *device; /* current device */
|
---|
| 52 | smallint hw_set; /* flag if hw-type was set (-H) */
|
---|
| 53 |
|
---|
| 54 | } FIX_ALIASING;
|
---|
| 55 | #define G (*(struct globals*)&bb_common_bufsiz1)
|
---|
| 56 | #define ap (G.ap )
|
---|
| 57 | #define hw (G.hw )
|
---|
| 58 | #define device (G.device )
|
---|
| 59 | #define hw_set (G.hw_set )
|
---|
| 60 | #define INIT_G() do { \
|
---|
| 61 | device = ""; \
|
---|
| 62 | } while (0)
|
---|
| 63 |
|
---|
| 64 |
|
---|
| 65 | static const char options[] ALIGN1 =
|
---|
| 66 | "pub\0"
|
---|
| 67 | "priv\0"
|
---|
| 68 | "temp\0"
|
---|
| 69 | "trail\0"
|
---|
| 70 | "dontpub\0"
|
---|
| 71 | "auto\0"
|
---|
| 72 | "dev\0"
|
---|
| 73 | "netmask\0";
|
---|
| 74 |
|
---|
| 75 | /* Delete an entry from the ARP cache. */
|
---|
| 76 | /* Called only from main, once */
|
---|
| 77 | static int arp_del(char **args)
|
---|
| 78 | {
|
---|
| 79 | char *host;
|
---|
| 80 | struct arpreq req;
|
---|
| 81 | struct sockaddr sa;
|
---|
| 82 | int flags = 0;
|
---|
| 83 | int err;
|
---|
| 84 |
|
---|
| 85 | memset(&req, 0, sizeof(req));
|
---|
| 86 |
|
---|
| 87 | /* Resolve the host name. */
|
---|
| 88 | host = *args;
|
---|
| 89 | if (ap->input(host, &sa) < 0) {
|
---|
| 90 | bb_herror_msg_and_die("%s", host);
|
---|
| 91 | }
|
---|
| 92 |
|
---|
| 93 | /* If a host has more than one address, use the correct one! */
|
---|
| 94 | memcpy(&req.arp_pa, &sa, sizeof(struct sockaddr));
|
---|
| 95 |
|
---|
| 96 | if (hw_set)
|
---|
| 97 | req.arp_ha.sa_family = hw->type;
|
---|
| 98 |
|
---|
| 99 | req.arp_flags = ATF_PERM;
|
---|
| 100 | args++;
|
---|
| 101 | while (*args != NULL) {
|
---|
| 102 | switch (index_in_strings(options, *args)) {
|
---|
| 103 | case 0: /* "pub" */
|
---|
| 104 | flags |= 1;
|
---|
| 105 | args++;
|
---|
| 106 | break;
|
---|
| 107 | case 1: /* "priv" */
|
---|
| 108 | flags |= 2;
|
---|
| 109 | args++;
|
---|
| 110 | break;
|
---|
| 111 | case 2: /* "temp" */
|
---|
| 112 | req.arp_flags &= ~ATF_PERM;
|
---|
| 113 | args++;
|
---|
| 114 | break;
|
---|
| 115 | case 3: /* "trail" */
|
---|
| 116 | req.arp_flags |= ATF_USETRAILERS;
|
---|
| 117 | args++;
|
---|
| 118 | break;
|
---|
| 119 | case 4: /* "dontpub" */
|
---|
| 120 | #ifdef HAVE_ATF_DONTPUB
|
---|
| 121 | req.arp_flags |= ATF_DONTPUB;
|
---|
| 122 | #else
|
---|
| 123 | bb_error_msg("feature ATF_DONTPUB is not supported");
|
---|
| 124 | #endif
|
---|
| 125 | args++;
|
---|
| 126 | break;
|
---|
| 127 | case 5: /* "auto" */
|
---|
| 128 | #ifdef HAVE_ATF_MAGIC
|
---|
| 129 | req.arp_flags |= ATF_MAGIC;
|
---|
| 130 | #else
|
---|
| 131 | bb_error_msg("feature ATF_MAGIC is not supported");
|
---|
| 132 | #endif
|
---|
| 133 | args++;
|
---|
| 134 | break;
|
---|
| 135 | case 6: /* "dev" */
|
---|
| 136 | if (*++args == NULL)
|
---|
| 137 | bb_show_usage();
|
---|
| 138 | device = *args;
|
---|
| 139 | args++;
|
---|
| 140 | break;
|
---|
| 141 | case 7: /* "netmask" */
|
---|
| 142 | if (*++args == NULL)
|
---|
| 143 | bb_show_usage();
|
---|
| 144 | if (strcmp(*args, "255.255.255.255") != 0) {
|
---|
| 145 | host = *args;
|
---|
| 146 | if (ap->input(host, &sa) < 0) {
|
---|
| 147 | bb_herror_msg_and_die("%s", host);
|
---|
| 148 | }
|
---|
| 149 | memcpy(&req.arp_netmask, &sa, sizeof(struct sockaddr));
|
---|
| 150 | req.arp_flags |= ATF_NETMASK;
|
---|
| 151 | }
|
---|
| 152 | args++;
|
---|
| 153 | break;
|
---|
| 154 | default:
|
---|
| 155 | bb_show_usage();
|
---|
| 156 | break;
|
---|
| 157 | }
|
---|
| 158 | }
|
---|
| 159 | if (flags == 0)
|
---|
| 160 | flags = 3;
|
---|
| 161 |
|
---|
| 162 | strncpy(req.arp_dev, device, sizeof(req.arp_dev));
|
---|
| 163 |
|
---|
| 164 | err = -1;
|
---|
| 165 |
|
---|
| 166 | /* Call the kernel. */
|
---|
| 167 | if (flags & 2) {
|
---|
| 168 | if (option_mask32 & ARP_OPT_v)
|
---|
| 169 | bb_error_msg("SIOCDARP(nopub)");
|
---|
| 170 | err = ioctl(sockfd, SIOCDARP, &req);
|
---|
| 171 | if (err < 0) {
|
---|
| 172 | if (errno == ENXIO) {
|
---|
| 173 | if (flags & 1)
|
---|
| 174 | goto nopub;
|
---|
| 175 | printf("No ARP entry for %s\n", host);
|
---|
| 176 | return -1;
|
---|
| 177 | }
|
---|
| 178 | bb_perror_msg_and_die("SIOCDARP(priv)");
|
---|
| 179 | }
|
---|
| 180 | }
|
---|
| 181 | if ((flags & 1) && err) {
|
---|
| 182 | nopub:
|
---|
| 183 | req.arp_flags |= ATF_PUBL;
|
---|
| 184 | if (option_mask32 & ARP_OPT_v)
|
---|
| 185 | bb_error_msg("SIOCDARP(pub)");
|
---|
| 186 | if (ioctl(sockfd, SIOCDARP, &req) < 0) {
|
---|
| 187 | if (errno == ENXIO) {
|
---|
| 188 | printf("No ARP entry for %s\n", host);
|
---|
| 189 | return -1;
|
---|
| 190 | }
|
---|
| 191 | bb_perror_msg_and_die("SIOCDARP(pub)");
|
---|
| 192 | }
|
---|
| 193 | }
|
---|
| 194 | return 0;
|
---|
| 195 | }
|
---|
| 196 |
|
---|
| 197 | /* Get the hardware address to a specified interface name */
|
---|
| 198 | static void arp_getdevhw(char *ifname, struct sockaddr *sa,
|
---|
| 199 | const struct hwtype *hwt)
|
---|
| 200 | {
|
---|
| 201 | struct ifreq ifr;
|
---|
| 202 | const struct hwtype *xhw;
|
---|
| 203 |
|
---|
| 204 | strcpy(ifr.ifr_name, ifname);
|
---|
| 205 | ioctl_or_perror_and_die(sockfd, SIOCGIFHWADDR, &ifr,
|
---|
| 206 | "cant get HW-Address for '%s'", ifname);
|
---|
| 207 | if (hwt && (ifr.ifr_hwaddr.sa_family != hw->type)) {
|
---|
| 208 | bb_error_msg_and_die("protocol type mismatch");
|
---|
| 209 | }
|
---|
| 210 | memcpy(sa, &(ifr.ifr_hwaddr), sizeof(struct sockaddr));
|
---|
| 211 |
|
---|
| 212 | if (option_mask32 & ARP_OPT_v) {
|
---|
| 213 | xhw = get_hwntype(ifr.ifr_hwaddr.sa_family);
|
---|
| 214 | if (!xhw || !xhw->print) {
|
---|
| 215 | xhw = get_hwntype(-1);
|
---|
| 216 | }
|
---|
| 217 | bb_error_msg("device '%s' has HW address %s '%s'",
|
---|
| 218 | ifname, xhw->name,
|
---|
| 219 | xhw->print((unsigned char *) &ifr.ifr_hwaddr.sa_data));
|
---|
| 220 | }
|
---|
| 221 | }
|
---|
| 222 |
|
---|
| 223 | /* Set an entry in the ARP cache. */
|
---|
| 224 | /* Called only from main, once */
|
---|
| 225 | static int arp_set(char **args)
|
---|
| 226 | {
|
---|
| 227 | char *host;
|
---|
| 228 | struct arpreq req;
|
---|
| 229 | struct sockaddr sa;
|
---|
| 230 | int flags;
|
---|
| 231 |
|
---|
| 232 | memset(&req, 0, sizeof(req));
|
---|
| 233 |
|
---|
| 234 | host = *args++;
|
---|
| 235 | if (ap->input(host, &sa) < 0) {
|
---|
| 236 | bb_herror_msg_and_die("%s", host);
|
---|
| 237 | }
|
---|
| 238 | /* If a host has more than one address, use the correct one! */
|
---|
| 239 | memcpy(&req.arp_pa, &sa, sizeof(struct sockaddr));
|
---|
| 240 |
|
---|
| 241 | /* Fetch the hardware address. */
|
---|
| 242 | if (*args == NULL) {
|
---|
| 243 | bb_error_msg_and_die("need hardware address");
|
---|
| 244 | }
|
---|
| 245 | if (option_mask32 & ARP_OPT_D) {
|
---|
| 246 | arp_getdevhw(*args++, &req.arp_ha, hw_set ? hw : NULL);
|
---|
| 247 | } else {
|
---|
| 248 | if (hw->input(*args++, &req.arp_ha) < 0) {
|
---|
| 249 | bb_error_msg_and_die("invalid hardware address");
|
---|
| 250 | }
|
---|
| 251 | }
|
---|
| 252 |
|
---|
| 253 | /* Check out any modifiers. */
|
---|
| 254 | flags = ATF_PERM | ATF_COM;
|
---|
| 255 | while (*args != NULL) {
|
---|
| 256 | switch (index_in_strings(options, *args)) {
|
---|
| 257 | case 0: /* "pub" */
|
---|
| 258 | flags |= ATF_PUBL;
|
---|
| 259 | args++;
|
---|
| 260 | break;
|
---|
| 261 | case 1: /* "priv" */
|
---|
| 262 | flags &= ~ATF_PUBL;
|
---|
| 263 | args++;
|
---|
| 264 | break;
|
---|
| 265 | case 2: /* "temp" */
|
---|
| 266 | flags &= ~ATF_PERM;
|
---|
| 267 | args++;
|
---|
| 268 | break;
|
---|
| 269 | case 3: /* "trail" */
|
---|
| 270 | flags |= ATF_USETRAILERS;
|
---|
| 271 | args++;
|
---|
| 272 | break;
|
---|
| 273 | case 4: /* "dontpub" */
|
---|
| 274 | #ifdef HAVE_ATF_DONTPUB
|
---|
| 275 | flags |= ATF_DONTPUB;
|
---|
| 276 | #else
|
---|
| 277 | bb_error_msg("feature ATF_DONTPUB is not supported");
|
---|
| 278 | #endif
|
---|
| 279 | args++;
|
---|
| 280 | break;
|
---|
| 281 | case 5: /* "auto" */
|
---|
| 282 | #ifdef HAVE_ATF_MAGIC
|
---|
| 283 | flags |= ATF_MAGIC;
|
---|
| 284 | #else
|
---|
| 285 | bb_error_msg("feature ATF_MAGIC is not supported");
|
---|
| 286 | #endif
|
---|
| 287 | args++;
|
---|
| 288 | break;
|
---|
| 289 | case 6: /* "dev" */
|
---|
| 290 | if (*++args == NULL)
|
---|
| 291 | bb_show_usage();
|
---|
| 292 | device = *args;
|
---|
| 293 | args++;
|
---|
| 294 | break;
|
---|
| 295 | case 7: /* "netmask" */
|
---|
| 296 | if (*++args == NULL)
|
---|
| 297 | bb_show_usage();
|
---|
| 298 | if (strcmp(*args, "255.255.255.255") != 0) {
|
---|
| 299 | host = *args;
|
---|
| 300 | if (ap->input(host, &sa) < 0) {
|
---|
| 301 | bb_herror_msg_and_die("%s", host);
|
---|
| 302 | }
|
---|
| 303 | memcpy(&req.arp_netmask, &sa, sizeof(struct sockaddr));
|
---|
| 304 | flags |= ATF_NETMASK;
|
---|
| 305 | }
|
---|
| 306 | args++;
|
---|
| 307 | break;
|
---|
| 308 | default:
|
---|
| 309 | bb_show_usage();
|
---|
| 310 | break;
|
---|
| 311 | }
|
---|
| 312 | }
|
---|
| 313 |
|
---|
| 314 | /* Fill in the remainder of the request. */
|
---|
| 315 | req.arp_flags = flags;
|
---|
| 316 |
|
---|
| 317 | strncpy(req.arp_dev, device, sizeof(req.arp_dev));
|
---|
| 318 |
|
---|
| 319 | /* Call the kernel. */
|
---|
| 320 | if (option_mask32 & ARP_OPT_v)
|
---|
| 321 | bb_error_msg("SIOCSARP()");
|
---|
| 322 | xioctl(sockfd, SIOCSARP, &req);
|
---|
| 323 | return 0;
|
---|
| 324 | }
|
---|
| 325 |
|
---|
| 326 |
|
---|
| 327 | /* Print the contents of an ARP request block. */
|
---|
| 328 | static void
|
---|
| 329 | arp_disp(const char *name, char *ip, int type, int arp_flags,
|
---|
| 330 | char *hwa, char *mask, char *dev)
|
---|
| 331 | {
|
---|
| 332 | static const int arp_masks[] = {
|
---|
| 333 | ATF_PERM, ATF_PUBL,
|
---|
| 334 | #ifdef HAVE_ATF_MAGIC
|
---|
| 335 | ATF_MAGIC,
|
---|
| 336 | #endif
|
---|
| 337 | #ifdef HAVE_ATF_DONTPUB
|
---|
| 338 | ATF_DONTPUB,
|
---|
| 339 | #endif
|
---|
| 340 | ATF_USETRAILERS,
|
---|
| 341 | };
|
---|
| 342 | static const char arp_labels[] ALIGN1 = "PERM\0""PUP\0"
|
---|
| 343 | #ifdef HAVE_ATF_MAGIC
|
---|
| 344 | "AUTO\0"
|
---|
| 345 | #endif
|
---|
| 346 | #ifdef HAVE_ATF_DONTPUB
|
---|
| 347 | "DONTPUB\0"
|
---|
| 348 | #endif
|
---|
| 349 | "TRAIL\0"
|
---|
| 350 | ;
|
---|
| 351 |
|
---|
| 352 | const struct hwtype *xhw;
|
---|
| 353 |
|
---|
| 354 | xhw = get_hwntype(type);
|
---|
| 355 | if (xhw == NULL)
|
---|
| 356 | xhw = get_hwtype(DFLT_HW);
|
---|
| 357 |
|
---|
| 358 | printf("%s (%s) at ", name, ip);
|
---|
| 359 |
|
---|
| 360 | if (!(arp_flags & ATF_COM)) {
|
---|
| 361 | if (arp_flags & ATF_PUBL)
|
---|
| 362 | printf("* ");
|
---|
| 363 | else
|
---|
| 364 | printf("<incomplete> ");
|
---|
| 365 | } else {
|
---|
| 366 | printf("%s [%s] ", hwa, xhw->name);
|
---|
| 367 | }
|
---|
| 368 |
|
---|
| 369 | if (arp_flags & ATF_NETMASK)
|
---|
| 370 | printf("netmask %s ", mask);
|
---|
| 371 |
|
---|
| 372 | print_flags_separated(arp_masks, arp_labels, arp_flags, " ");
|
---|
| 373 | printf(" on %s\n", dev);
|
---|
| 374 | }
|
---|
| 375 |
|
---|
| 376 | /* Display the contents of the ARP cache in the kernel. */
|
---|
| 377 | /* Called only from main, once */
|
---|
| 378 | static int arp_show(char *name)
|
---|
| 379 | {
|
---|
| 380 | const char *host;
|
---|
| 381 | const char *hostname;
|
---|
| 382 | FILE *fp;
|
---|
| 383 | struct sockaddr sa;
|
---|
| 384 | int type, flags;
|
---|
| 385 | int num;
|
---|
| 386 | unsigned entries = 0, shown = 0;
|
---|
| 387 | char ip[128];
|
---|
| 388 | char hwa[128];
|
---|
| 389 | char mask[128];
|
---|
| 390 | char line[128];
|
---|
| 391 | char dev[128];
|
---|
| 392 |
|
---|
| 393 | host = NULL;
|
---|
| 394 | if (name != NULL) {
|
---|
| 395 | /* Resolve the host name. */
|
---|
| 396 | if (ap->input(name, &sa) < 0) {
|
---|
| 397 | bb_herror_msg_and_die("%s", name);
|
---|
| 398 | }
|
---|
| 399 | host = xstrdup(ap->sprint(&sa, 1));
|
---|
| 400 | }
|
---|
| 401 | fp = xfopen_for_read("/proc/net/arp");
|
---|
| 402 | /* Bypass header -- read one line */
|
---|
| 403 | fgets(line, sizeof(line), fp);
|
---|
| 404 |
|
---|
| 405 | /* Read the ARP cache entries. */
|
---|
| 406 | while (fgets(line, sizeof(line), fp)) {
|
---|
| 407 |
|
---|
| 408 | mask[0] = '-'; mask[1] = '\0';
|
---|
| 409 | dev[0] = '-'; dev[1] = '\0';
|
---|
| 410 | /* All these strings can't overflow
|
---|
| 411 | * because fgets above reads limited amount of data */
|
---|
| 412 | num = sscanf(line, "%s 0x%x 0x%x %s %s %s\n",
|
---|
| 413 | ip, &type, &flags, hwa, mask, dev);
|
---|
| 414 | if (num < 4)
|
---|
| 415 | break;
|
---|
| 416 |
|
---|
| 417 | entries++;
|
---|
| 418 | /* if the user specified hw-type differs, skip it */
|
---|
| 419 | if (hw_set && (type != hw->type))
|
---|
| 420 | continue;
|
---|
| 421 |
|
---|
| 422 | /* if the user specified address differs, skip it */
|
---|
| 423 | if (host && strcmp(ip, host) != 0)
|
---|
| 424 | continue;
|
---|
| 425 |
|
---|
| 426 | /* if the user specified device differs, skip it */
|
---|
| 427 | if (device[0] && strcmp(dev, device) != 0)
|
---|
| 428 | continue;
|
---|
| 429 |
|
---|
| 430 | shown++;
|
---|
| 431 | /* This IS ugly but it works -be */
|
---|
| 432 | hostname = "?";
|
---|
| 433 | if (!(option_mask32 & ARP_OPT_n)) {
|
---|
| 434 | if (ap->input(ip, &sa) < 0)
|
---|
| 435 | hostname = ip;
|
---|
| 436 | else
|
---|
| 437 | hostname = ap->sprint(&sa, (option_mask32 & ARP_OPT_n) | 0x8000);
|
---|
| 438 | if (strcmp(hostname, ip) == 0)
|
---|
| 439 | hostname = "?";
|
---|
| 440 | }
|
---|
| 441 |
|
---|
| 442 | arp_disp(hostname, ip, type, flags, hwa, mask, dev);
|
---|
| 443 | }
|
---|
| 444 | if (option_mask32 & ARP_OPT_v)
|
---|
| 445 | printf("Entries: %d\tSkipped: %d\tFound: %d\n",
|
---|
| 446 | entries, entries - shown, shown);
|
---|
| 447 |
|
---|
| 448 | if (!shown) {
|
---|
| 449 | if (hw_set || host || device[0])
|
---|
| 450 | printf("No match found in %d entries\n", entries);
|
---|
| 451 | }
|
---|
| 452 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
| 453 | free((char*)host);
|
---|
| 454 | fclose(fp);
|
---|
| 455 | }
|
---|
| 456 | return 0;
|
---|
| 457 | }
|
---|
| 458 |
|
---|
| 459 | int arp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 460 | int arp_main(int argc UNUSED_PARAM, char **argv)
|
---|
| 461 | {
|
---|
| 462 | const char *hw_type = "ether";
|
---|
| 463 | const char *protocol;
|
---|
| 464 | unsigned opts;
|
---|
| 465 |
|
---|
| 466 | INIT_G();
|
---|
| 467 |
|
---|
| 468 | xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), sockfd);
|
---|
| 469 | ap = get_aftype(DFLT_AF);
|
---|
| 470 | if (!ap)
|
---|
| 471 | bb_error_msg_and_die("%s: %s not supported", DFLT_AF, "address family");
|
---|
| 472 |
|
---|
| 473 | opts = getopt32(argv, "A:p:H:t:i:adnDsv", &protocol, &protocol,
|
---|
| 474 | &hw_type, &hw_type, &device);
|
---|
| 475 | argv += optind;
|
---|
| 476 | if (opts & (ARP_OPT_A | ARP_OPT_p)) {
|
---|
| 477 | ap = get_aftype(protocol);
|
---|
| 478 | if (ap == NULL)
|
---|
| 479 | bb_error_msg_and_die("%s: unknown %s", protocol, "address family");
|
---|
| 480 | }
|
---|
| 481 | if (opts & (ARP_OPT_A | ARP_OPT_p)) {
|
---|
| 482 | hw = get_hwtype(hw_type);
|
---|
| 483 | if (hw == NULL)
|
---|
| 484 | bb_error_msg_and_die("%s: unknown %s", hw_type, "hardware type");
|
---|
| 485 | hw_set = 1;
|
---|
| 486 | }
|
---|
| 487 | //if (opts & ARP_OPT_i)... -i
|
---|
| 488 |
|
---|
| 489 | if (ap->af != AF_INET) {
|
---|
| 490 | bb_error_msg_and_die("%s: kernel only supports 'inet'", ap->name);
|
---|
| 491 | }
|
---|
| 492 |
|
---|
| 493 | /* If no hw type specified get default */
|
---|
| 494 | if (!hw) {
|
---|
| 495 | hw = get_hwtype(DFLT_HW);
|
---|
| 496 | if (!hw)
|
---|
| 497 | bb_error_msg_and_die("%s: %s not supported", DFLT_HW, "hardware type");
|
---|
| 498 | }
|
---|
| 499 |
|
---|
| 500 | if (hw->alen <= 0) {
|
---|
| 501 | bb_error_msg_and_die("%s: %s without ARP support",
|
---|
| 502 | hw->name, "hardware type");
|
---|
| 503 | }
|
---|
| 504 |
|
---|
| 505 | /* Now see what we have to do here... */
|
---|
| 506 | if (opts & (ARP_OPT_d | ARP_OPT_s)) {
|
---|
| 507 | if (argv[0] == NULL)
|
---|
| 508 | bb_error_msg_and_die("need host name");
|
---|
| 509 | if (opts & ARP_OPT_s)
|
---|
| 510 | return arp_set(argv);
|
---|
| 511 | return arp_del(argv);
|
---|
| 512 | }
|
---|
| 513 | //if (opts & ARP_OPT_a) - default
|
---|
| 514 | return arp_show(argv[0]);
|
---|
| 515 | }
|
---|