[821] | 1 | /*
|
---|
| 2 | * RFC3927 ZeroConf IPv4 Link-Local addressing
|
---|
| 3 | * (see <http://www.zeroconf.org/>)
|
---|
| 4 | *
|
---|
| 5 | * Copyright (C) 2003 by Arthur van Hoff (avh@strangeberry.com)
|
---|
| 6 | * Copyright (C) 2004 by David Brownell
|
---|
| 7 | *
|
---|
| 8 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
|
---|
| 9 | */
|
---|
| 10 |
|
---|
| 11 | /*
|
---|
| 12 | * ZCIP just manages the 169.254.*.* addresses. That network is not
|
---|
| 13 | * routed at the IP level, though various proxies or bridges can
|
---|
| 14 | * certainly be used. Its naming is built over multicast DNS.
|
---|
| 15 | */
|
---|
| 16 |
|
---|
| 17 | // #define DEBUG
|
---|
| 18 |
|
---|
| 19 | // TODO:
|
---|
| 20 | // - more real-world usage/testing, especially daemon mode
|
---|
| 21 | // - kernel packet filters to reduce scheduling noise
|
---|
| 22 | // - avoid silent script failures, especially under load...
|
---|
| 23 | // - link status monitoring (restart on link-up; stop on link-down)
|
---|
| 24 |
|
---|
| 25 | #include "busybox.h"
|
---|
| 26 | #include <errno.h>
|
---|
| 27 | #include <string.h>
|
---|
| 28 | #include <syslog.h>
|
---|
| 29 | #include <poll.h>
|
---|
| 30 | #include <time.h>
|
---|
| 31 |
|
---|
| 32 | #include <sys/wait.h>
|
---|
| 33 |
|
---|
| 34 | #include <netinet/ether.h>
|
---|
| 35 | #include <net/ethernet.h>
|
---|
| 36 | #include <net/if.h>
|
---|
| 37 | #include <net/if_arp.h>
|
---|
| 38 |
|
---|
| 39 | #include <linux/if_packet.h>
|
---|
| 40 | #include <linux/sockios.h>
|
---|
| 41 |
|
---|
| 42 |
|
---|
| 43 | struct arp_packet {
|
---|
| 44 | struct ether_header hdr;
|
---|
| 45 | // FIXME this part is netinet/if_ether.h "struct ether_arp"
|
---|
| 46 | struct arphdr arp;
|
---|
| 47 | struct ether_addr source_addr;
|
---|
| 48 | struct in_addr source_ip;
|
---|
| 49 | struct ether_addr target_addr;
|
---|
| 50 | struct in_addr target_ip;
|
---|
| 51 | } ATTRIBUTE_PACKED;
|
---|
| 52 |
|
---|
| 53 | enum {
|
---|
| 54 | /* 169.254.0.0 */
|
---|
| 55 | LINKLOCAL_ADDR = 0xa9fe0000,
|
---|
| 56 |
|
---|
| 57 | /* protocol timeout parameters, specified in seconds */
|
---|
| 58 | PROBE_WAIT = 1,
|
---|
| 59 | PROBE_MIN = 1,
|
---|
| 60 | PROBE_MAX = 2,
|
---|
| 61 | PROBE_NUM = 3,
|
---|
| 62 | MAX_CONFLICTS = 10,
|
---|
| 63 | RATE_LIMIT_INTERVAL = 60,
|
---|
| 64 | ANNOUNCE_WAIT = 2,
|
---|
| 65 | ANNOUNCE_NUM = 2,
|
---|
| 66 | ANNOUNCE_INTERVAL = 2,
|
---|
| 67 | DEFEND_INTERVAL = 10
|
---|
| 68 | };
|
---|
| 69 |
|
---|
| 70 | static const struct in_addr null_ip = { 0 };
|
---|
| 71 | static const struct ether_addr null_addr = { {0, 0, 0, 0, 0, 0} };
|
---|
| 72 |
|
---|
| 73 | static int verbose = 0;
|
---|
| 74 |
|
---|
| 75 | #define DBG(fmt,args...) \
|
---|
| 76 | do { } while (0)
|
---|
| 77 | #define VDBG DBG
|
---|
| 78 |
|
---|
| 79 | /**
|
---|
| 80 | * Pick a random link local IP address on 169.254/16, except that
|
---|
| 81 | * the first and last 256 addresses are reserved.
|
---|
| 82 | */
|
---|
| 83 | static void pick(struct in_addr *ip)
|
---|
| 84 | {
|
---|
| 85 | unsigned tmp;
|
---|
| 86 |
|
---|
| 87 | /* use cheaper math than lrand48() mod N */
|
---|
| 88 | do {
|
---|
| 89 | tmp = (lrand48() >> 16) & IN_CLASSB_HOST;
|
---|
| 90 | } while (tmp > (IN_CLASSB_HOST - 0x0200));
|
---|
| 91 | ip->s_addr = htonl((LINKLOCAL_ADDR + 0x0100) + tmp);
|
---|
| 92 | }
|
---|
| 93 |
|
---|
| 94 | /**
|
---|
| 95 | * Broadcast an ARP packet.
|
---|
| 96 | */
|
---|
| 97 | static int arp(int fd, struct sockaddr *saddr, int op,
|
---|
| 98 | const struct ether_addr *source_addr, struct in_addr source_ip,
|
---|
| 99 | const struct ether_addr *target_addr, struct in_addr target_ip)
|
---|
| 100 | {
|
---|
| 101 | struct arp_packet p;
|
---|
| 102 |
|
---|
| 103 | // ether header
|
---|
| 104 | p.hdr.ether_type = htons(ETHERTYPE_ARP);
|
---|
| 105 | memcpy(p.hdr.ether_shost, source_addr, ETH_ALEN);
|
---|
| 106 | memset(p.hdr.ether_dhost, 0xff, ETH_ALEN);
|
---|
| 107 |
|
---|
| 108 | // arp request
|
---|
| 109 | p.arp.ar_hrd = htons(ARPHRD_ETHER);
|
---|
| 110 | p.arp.ar_pro = htons(ETHERTYPE_IP);
|
---|
| 111 | p.arp.ar_hln = ETH_ALEN;
|
---|
| 112 | p.arp.ar_pln = 4;
|
---|
| 113 | p.arp.ar_op = htons(op);
|
---|
| 114 | memcpy(&p.source_addr, source_addr, ETH_ALEN);
|
---|
| 115 | memcpy(&p.source_ip, &source_ip, sizeof (p.source_ip));
|
---|
| 116 | memcpy(&p.target_addr, target_addr, ETH_ALEN);
|
---|
| 117 | memcpy(&p.target_ip, &target_ip, sizeof (p.target_ip));
|
---|
| 118 |
|
---|
| 119 | // send it
|
---|
| 120 | if (sendto(fd, &p, sizeof (p), 0, saddr, sizeof (*saddr)) < 0) {
|
---|
| 121 | perror("sendto");
|
---|
| 122 | return -errno;
|
---|
| 123 | }
|
---|
| 124 | return 0;
|
---|
| 125 | }
|
---|
| 126 |
|
---|
| 127 | /**
|
---|
| 128 | * Run a script.
|
---|
| 129 | */
|
---|
| 130 | static int run(char *script, char *arg, char *intf, struct in_addr *ip)
|
---|
| 131 | {
|
---|
| 132 | int pid, status;
|
---|
| 133 | char *why;
|
---|
| 134 |
|
---|
| 135 | if (script != NULL) {
|
---|
| 136 | VDBG("%s run %s %s\n", intf, script, arg);
|
---|
| 137 | if (ip != NULL) {
|
---|
| 138 | char *addr = inet_ntoa(*ip);
|
---|
| 139 | setenv("ip", addr, 1);
|
---|
| 140 | syslog(LOG_INFO, "%s %s %s", arg, intf, addr);
|
---|
| 141 | }
|
---|
| 142 |
|
---|
| 143 | pid = vfork();
|
---|
| 144 | if (pid < 0) { // error
|
---|
| 145 | why = "vfork";
|
---|
| 146 | goto bad;
|
---|
| 147 | } else if (pid == 0) { // child
|
---|
| 148 | execl(script, script, arg, NULL);
|
---|
| 149 | perror("execl");
|
---|
| 150 | _exit(EXIT_FAILURE);
|
---|
| 151 | }
|
---|
| 152 |
|
---|
| 153 | if (waitpid(pid, &status, 0) <= 0) {
|
---|
| 154 | why = "waitpid";
|
---|
| 155 | goto bad;
|
---|
| 156 | }
|
---|
| 157 | if (WEXITSTATUS(status) != 0) {
|
---|
| 158 | bb_error_msg("script %s failed, exit=%d\n",
|
---|
| 159 | script, WEXITSTATUS(status));
|
---|
| 160 | return -errno;
|
---|
| 161 | }
|
---|
| 162 | }
|
---|
| 163 | return 0;
|
---|
| 164 | bad:
|
---|
| 165 | status = -errno;
|
---|
| 166 | syslog(LOG_ERR, "%s %s, %s error: %s",
|
---|
| 167 | arg, intf, why, strerror(errno));
|
---|
| 168 | return status;
|
---|
| 169 | }
|
---|
| 170 |
|
---|
| 171 |
|
---|
| 172 | /**
|
---|
| 173 | * Return milliseconds of random delay, up to "secs" seconds.
|
---|
| 174 | */
|
---|
| 175 | static inline unsigned ms_rdelay(unsigned secs)
|
---|
| 176 | {
|
---|
| 177 | return lrand48() % (secs * 1000);
|
---|
| 178 | }
|
---|
| 179 |
|
---|
| 180 | /**
|
---|
| 181 | * main program
|
---|
| 182 | */
|
---|
| 183 |
|
---|
| 184 | int zcip_main(int argc, char *argv[])
|
---|
| 185 | {
|
---|
| 186 | char *intf = NULL;
|
---|
| 187 | char *script = NULL;
|
---|
| 188 | int quit = 0;
|
---|
| 189 | int foreground = 0;
|
---|
| 190 |
|
---|
| 191 | char *why;
|
---|
| 192 | struct sockaddr saddr;
|
---|
| 193 | struct ether_addr addr;
|
---|
| 194 | struct in_addr ip = { 0 };
|
---|
| 195 | int fd;
|
---|
| 196 | int ready = 0;
|
---|
| 197 | suseconds_t timeout = 0; // milliseconds
|
---|
| 198 | time_t defend = 0;
|
---|
| 199 | unsigned conflicts = 0;
|
---|
| 200 | unsigned nprobes = 0;
|
---|
| 201 | unsigned nclaims = 0;
|
---|
| 202 | int t;
|
---|
| 203 |
|
---|
| 204 | // parse commandline: prog [options] ifname script
|
---|
| 205 | while ((t = getopt(argc, argv, "fqr:v")) != EOF) {
|
---|
| 206 | switch (t) {
|
---|
| 207 | case 'f':
|
---|
| 208 | foreground = 1;
|
---|
| 209 | continue;
|
---|
| 210 | case 'q':
|
---|
| 211 | quit = 1;
|
---|
| 212 | continue;
|
---|
| 213 | case 'r':
|
---|
| 214 | if (inet_aton(optarg, &ip) == 0
|
---|
| 215 | || (ntohl(ip.s_addr) & IN_CLASSB_NET)
|
---|
| 216 | != LINKLOCAL_ADDR) {
|
---|
| 217 | bb_error_msg_and_die("invalid link address");
|
---|
| 218 | }
|
---|
| 219 | continue;
|
---|
| 220 | case 'v':
|
---|
| 221 | verbose++;
|
---|
| 222 | foreground = 1;
|
---|
| 223 | continue;
|
---|
| 224 | default:
|
---|
| 225 | bb_error_msg_and_die("bad option");
|
---|
| 226 | }
|
---|
| 227 | }
|
---|
| 228 | if (optind < argc - 1) {
|
---|
| 229 | intf = argv[optind++];
|
---|
| 230 | setenv("interface", intf, 1);
|
---|
| 231 | script = argv[optind++];
|
---|
| 232 | }
|
---|
| 233 | if (optind != argc || !intf)
|
---|
| 234 | bb_show_usage();
|
---|
| 235 | openlog(bb_applet_name, 0, LOG_DAEMON);
|
---|
| 236 |
|
---|
| 237 | // initialize the interface (modprobe, ifup, etc)
|
---|
| 238 | if (run(script, "init", intf, NULL) < 0)
|
---|
| 239 | return EXIT_FAILURE;
|
---|
| 240 |
|
---|
| 241 | // initialize saddr
|
---|
| 242 | memset(&saddr, 0, sizeof (saddr));
|
---|
| 243 | safe_strncpy(saddr.sa_data, intf, sizeof (saddr.sa_data));
|
---|
| 244 |
|
---|
| 245 | // open an ARP socket
|
---|
| 246 | if ((fd = socket(PF_PACKET, SOCK_PACKET, htons(ETH_P_ARP))) < 0) {
|
---|
| 247 | why = "open";
|
---|
| 248 | fail:
|
---|
| 249 | foreground = 1;
|
---|
| 250 | goto bad;
|
---|
| 251 | }
|
---|
| 252 | // bind to the interface's ARP socket
|
---|
| 253 | if (bind(fd, &saddr, sizeof (saddr)) < 0) {
|
---|
| 254 | why = "bind";
|
---|
| 255 | goto fail;
|
---|
| 256 | } else {
|
---|
| 257 | struct ifreq ifr;
|
---|
| 258 | unsigned short seed[3];
|
---|
| 259 |
|
---|
| 260 | // get the interface's ethernet address
|
---|
| 261 | memset(&ifr, 0, sizeof (ifr));
|
---|
| 262 | strncpy(ifr.ifr_name, intf, sizeof (ifr.ifr_name));
|
---|
| 263 | if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) {
|
---|
| 264 | why = "get ethernet address";
|
---|
| 265 | goto fail;
|
---|
| 266 | }
|
---|
| 267 | memcpy(&addr, &ifr.ifr_hwaddr.sa_data, ETH_ALEN);
|
---|
| 268 |
|
---|
| 269 | // start with some stable ip address, either a function of
|
---|
| 270 | // the hardware address or else the last address we used.
|
---|
| 271 | // NOTE: the sequence of addresses we try changes only
|
---|
| 272 | // depending on when we detect conflicts.
|
---|
| 273 | memcpy(seed, &ifr.ifr_hwaddr.sa_data, ETH_ALEN);
|
---|
| 274 | seed48(seed);
|
---|
| 275 | if (ip.s_addr == 0)
|
---|
| 276 | pick(&ip);
|
---|
| 277 | }
|
---|
| 278 |
|
---|
| 279 | // FIXME cases to handle:
|
---|
| 280 | // - zcip already running!
|
---|
| 281 | // - link already has local address... just defend/update
|
---|
| 282 |
|
---|
| 283 | // daemonize now; don't delay system startup
|
---|
| 284 | if (!foreground) {
|
---|
| 285 | if (daemon(0, verbose) < 0) {
|
---|
| 286 | why = "daemon";
|
---|
| 287 | goto bad;
|
---|
| 288 | }
|
---|
| 289 | syslog(LOG_INFO, "start, interface %s", intf);
|
---|
| 290 | }
|
---|
| 291 |
|
---|
| 292 | // run the dynamic address negotiation protocol,
|
---|
| 293 | // restarting after address conflicts:
|
---|
| 294 | // - start with some address we want to try
|
---|
| 295 | // - short random delay
|
---|
| 296 | // - arp probes to see if another host else uses it
|
---|
| 297 | // - arp announcements that we're claiming it
|
---|
| 298 | // - use it
|
---|
| 299 | // - defend it, within limits
|
---|
| 300 | while (1) {
|
---|
| 301 | struct pollfd fds[1];
|
---|
| 302 | struct timeval tv1;
|
---|
| 303 | struct arp_packet p;
|
---|
| 304 |
|
---|
| 305 | fds[0].fd = fd;
|
---|
| 306 | fds[0].events = POLLIN;
|
---|
| 307 | fds[0].revents = 0;
|
---|
| 308 |
|
---|
| 309 | // poll, being ready to adjust current timeout
|
---|
| 310 | if (!timeout) {
|
---|
| 311 | timeout = ms_rdelay(PROBE_WAIT);
|
---|
| 312 | // FIXME setsockopt(fd, SO_ATTACH_FILTER, ...) to
|
---|
| 313 | // make the kernel filter out all packets except
|
---|
| 314 | // ones we'd care about.
|
---|
| 315 | }
|
---|
| 316 | gettimeofday(&tv1, NULL);
|
---|
| 317 | tv1.tv_usec += (timeout % 1000) * 1000;
|
---|
| 318 | while (tv1.tv_usec > 1000000) {
|
---|
| 319 | tv1.tv_usec -= 1000000;
|
---|
| 320 | tv1.tv_sec++;
|
---|
| 321 | }
|
---|
| 322 | tv1.tv_sec += timeout / 1000;
|
---|
| 323 |
|
---|
| 324 | VDBG("...wait %ld %s nprobes=%d, nclaims=%d\n",
|
---|
| 325 | timeout, intf, nprobes, nclaims);
|
---|
| 326 | switch (poll(fds, 1, timeout)) {
|
---|
| 327 |
|
---|
| 328 | // timeouts trigger protocol transitions
|
---|
| 329 | case 0:
|
---|
| 330 | // probes
|
---|
| 331 | if (nprobes < PROBE_NUM) {
|
---|
| 332 | nprobes++;
|
---|
| 333 | VDBG("probe/%d %s@%s\n",
|
---|
| 334 | nprobes, intf, inet_ntoa(ip));
|
---|
| 335 | (void)arp(fd, &saddr, ARPOP_REQUEST,
|
---|
| 336 | &addr, null_ip,
|
---|
| 337 | &null_addr, ip);
|
---|
| 338 | if (nprobes < PROBE_NUM) {
|
---|
| 339 | timeout = PROBE_MIN * 1000;
|
---|
| 340 | timeout += ms_rdelay(PROBE_MAX
|
---|
| 341 | - PROBE_MIN);
|
---|
| 342 | } else
|
---|
| 343 | timeout = ANNOUNCE_WAIT * 1000;
|
---|
| 344 | }
|
---|
| 345 | // then announcements
|
---|
| 346 | else if (nclaims < ANNOUNCE_NUM) {
|
---|
| 347 | nclaims++;
|
---|
| 348 | VDBG("announce/%d %s@%s\n",
|
---|
| 349 | nclaims, intf, inet_ntoa(ip));
|
---|
| 350 | (void)arp(fd, &saddr, ARPOP_REQUEST,
|
---|
| 351 | &addr, ip,
|
---|
| 352 | &addr, ip);
|
---|
| 353 | if (nclaims < ANNOUNCE_NUM) {
|
---|
| 354 | timeout = ANNOUNCE_INTERVAL * 1000;
|
---|
| 355 | } else {
|
---|
| 356 | // link is ok to use earlier
|
---|
| 357 | run(script, "config", intf, &ip);
|
---|
| 358 | ready = 1;
|
---|
| 359 | conflicts = 0;
|
---|
| 360 | timeout = -1;
|
---|
| 361 |
|
---|
| 362 | // NOTE: all other exit paths
|
---|
| 363 | // should deconfig ...
|
---|
| 364 | if (quit)
|
---|
| 365 | return EXIT_SUCCESS;
|
---|
| 366 | // FIXME update filters
|
---|
| 367 | }
|
---|
| 368 | }
|
---|
| 369 | break;
|
---|
| 370 |
|
---|
| 371 | // packets arriving
|
---|
| 372 | case 1:
|
---|
| 373 | // maybe adjust timeout
|
---|
| 374 | if (timeout > 0) {
|
---|
| 375 | struct timeval tv2;
|
---|
| 376 |
|
---|
| 377 | gettimeofday(&tv2, NULL);
|
---|
| 378 | if (timercmp(&tv1, &tv2, <)) {
|
---|
| 379 | timeout = 0;
|
---|
| 380 | } else {
|
---|
| 381 | timersub(&tv1, &tv2, &tv1);
|
---|
| 382 | timeout = 1000 * tv1.tv_sec
|
---|
| 383 | + tv1.tv_usec / 1000;
|
---|
| 384 | }
|
---|
| 385 | }
|
---|
| 386 | if ((fds[0].revents & POLLIN) == 0) {
|
---|
| 387 | if (fds[0].revents & POLLERR) {
|
---|
| 388 | // FIXME: links routinely go down;
|
---|
| 389 | // this shouldn't necessarily exit.
|
---|
| 390 | bb_error_msg("%s: poll error\n", intf);
|
---|
| 391 | if (ready) {
|
---|
| 392 | run(script, "deconfig",
|
---|
| 393 | intf, &ip);
|
---|
| 394 | }
|
---|
| 395 | return EXIT_FAILURE;
|
---|
| 396 | }
|
---|
| 397 | continue;
|
---|
| 398 | }
|
---|
| 399 | // read ARP packet
|
---|
| 400 | if (recv(fd, &p, sizeof (p), 0) < 0) {
|
---|
| 401 | why = "recv";
|
---|
| 402 | goto bad;
|
---|
| 403 | }
|
---|
| 404 | if (p.hdr.ether_type != htons(ETHERTYPE_ARP))
|
---|
| 405 | continue;
|
---|
| 406 |
|
---|
| 407 | VDBG("%s recv arp type=%d, op=%d,\n",
|
---|
| 408 | intf, ntohs(p.hdr.ether_type),
|
---|
| 409 | ntohs(p.arp.ar_op));
|
---|
| 410 | VDBG("\tsource=%s %s\n",
|
---|
| 411 | ether_ntoa(&p.source_addr),
|
---|
| 412 | inet_ntoa(p.source_ip));
|
---|
| 413 | VDBG("\ttarget=%s %s\n",
|
---|
| 414 | ether_ntoa(&p.target_addr),
|
---|
| 415 | inet_ntoa(p.target_ip));
|
---|
| 416 | if (p.arp.ar_op != htons(ARPOP_REQUEST)
|
---|
| 417 | && p.arp.ar_op != htons(ARPOP_REPLY))
|
---|
| 418 | continue;
|
---|
| 419 |
|
---|
| 420 | // some cases are always conflicts
|
---|
| 421 | if ((p.source_ip.s_addr == ip.s_addr)
|
---|
| 422 | && (memcmp(&addr, &p.source_addr,
|
---|
| 423 | ETH_ALEN) != 0)) {
|
---|
| 424 | collision:
|
---|
| 425 | VDBG("%s ARP conflict from %s\n", intf,
|
---|
| 426 | ether_ntoa(&p.source_addr));
|
---|
| 427 | if (ready) {
|
---|
| 428 | time_t now = time(0);
|
---|
| 429 |
|
---|
| 430 | if ((defend + DEFEND_INTERVAL)
|
---|
| 431 | < now) {
|
---|
| 432 | defend = now;
|
---|
| 433 | (void)arp(fd, &saddr,
|
---|
| 434 | ARPOP_REQUEST,
|
---|
| 435 | &addr, ip,
|
---|
| 436 | &addr, ip);
|
---|
| 437 | VDBG("%s defend\n", intf);
|
---|
| 438 | timeout = -1;
|
---|
| 439 | continue;
|
---|
| 440 | }
|
---|
| 441 | defend = now;
|
---|
| 442 | ready = 0;
|
---|
| 443 | run(script, "deconfig", intf, &ip);
|
---|
| 444 | // FIXME rm filters: setsockopt(fd,
|
---|
| 445 | // SO_DETACH_FILTER, ...)
|
---|
| 446 | }
|
---|
| 447 | conflicts++;
|
---|
| 448 | if (conflicts >= MAX_CONFLICTS) {
|
---|
| 449 | VDBG("%s ratelimit\n", intf);
|
---|
| 450 | sleep(RATE_LIMIT_INTERVAL);
|
---|
| 451 | }
|
---|
| 452 | // restart the whole protocol
|
---|
| 453 | pick(&ip);
|
---|
| 454 | timeout = 0;
|
---|
| 455 | nprobes = 0;
|
---|
| 456 | nclaims = 0;
|
---|
| 457 | }
|
---|
| 458 | // two hosts probing one address is a collision too
|
---|
| 459 | else if (p.target_ip.s_addr == ip.s_addr
|
---|
| 460 | && nclaims == 0
|
---|
| 461 | && p.arp.ar_op == htons(ARPOP_REQUEST)
|
---|
| 462 | && memcmp(&addr, &p.target_addr,
|
---|
| 463 | ETH_ALEN) != 0) {
|
---|
| 464 | goto collision;
|
---|
| 465 | }
|
---|
| 466 | break;
|
---|
| 467 |
|
---|
| 468 | default:
|
---|
| 469 | why = "poll";
|
---|
| 470 | goto bad;
|
---|
| 471 | }
|
---|
| 472 | }
|
---|
| 473 | bad:
|
---|
| 474 | if (foreground)
|
---|
| 475 | perror(why);
|
---|
| 476 | else
|
---|
| 477 | syslog(LOG_ERR, "%s %s, %s error: %s",
|
---|
| 478 | bb_applet_name, intf, why, strerror(errno));
|
---|
| 479 | return EXIT_FAILURE;
|
---|
| 480 | }
|
---|