src/odhcp6c.c

   1 /**
   2  * Copyright (C) 2012-2014 Steven Barth <steven@midlink.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License v2 as published by
   6  * the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  */
  14
  15 #include <time.h>
  16 #include <errno.h>
  17 #include <fcntl.h>
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <stddef.h>
  21 #include <unistd.h>
  22 #include <syslog.h>
  23 #include <signal.h>
  24 #include <string.h>
  25 #include <stdbool.h>
  26
  27 #include <net/if.h>
  28 #include <sys/syscall.h>
  29 #include <arpa/inet.h>
  30
  31 #include "odhcp6c.h"
  32 #include "ra.h"
  33
  34
  35
  36 static void sighandler(int signal);
  37 static int usage(void);
  38
  39 static uint8_t *state_data[_STATE_MAX] = {NULL};
  40 static size_t state_len[_STATE_MAX] = {0};
  41
  42 static volatile bool signal_io = false;
  43 static volatile bool signal_usr1 = false;
  44 static volatile bool signal_usr2 = false;
  45 static volatile bool signal_term = false;
  46
  47 static int urandom_fd = -1, allow_slaac_only = 0;
  48 static bool bound = false, release = true, ra = false;
  49 static time_t last_update = 0;
  50
  51 static unsigned int min_update_interval = DEFAULT_MIN_UPDATE_INTERVAL;
  52 static unsigned int script_sync_delay = 10;
  53 static unsigned int script_accu_delay = 1;
  54
  55 int main(_unused int argc, char* const argv[])
  56 {
  57         // Allocate ressources
  58         const char *pidfile = NULL;
  59         const char *script = "/usr/sbin/odhcp6c-update";
  60         ssize_t l;
  61         uint8_t buf[134];
  62         char *optpos;
  63         uint16_t opttype;
  64         uint16_t optlen;
  65         enum odhcp6c_ia_mode ia_na_mode = IA_MODE_TRY;
  66         enum odhcp6c_ia_mode ia_pd_mode = IA_MODE_NONE;
  67         int ia_pd_iaid_index = 0;
  68         static struct in6_addr ifid = IN6ADDR_ANY_INIT;
  69         int sol_timeout = DHCPV6_SOL_MAX_RT;
  70         int verbosity = 0;
  71
  72
  73         bool help = false, daemonize = false;
  74         int logopt = LOG_PID;
  75         int c;
  76         unsigned int client_options = DHCPV6_CLIENT_FQDN | DHCPV6_ACCEPT_RECONFIGURE;
  77
  78         while ((c = getopt(argc, argv, "S::N:V:P:FB:c:i:r:Ru:s:kt:m:hedp:fav")) != -1) {
  79                 switch (c) {
  80                 case 'S':
  81                         allow_slaac_only = (optarg) ? atoi(optarg) : -1;
  82                         break;
  83
  84                 case 'N':
  85                         if (!strcmp(optarg, "force")) {
  86                                 ia_na_mode = IA_MODE_FORCE;
  87                                 allow_slaac_only = -1;
  88                         } else if (!strcmp(optarg, "none")) {
  89                                 ia_na_mode = IA_MODE_NONE;
  90                         } else if (!strcmp(optarg, "try")) {
  91                                 ia_na_mode = IA_MODE_TRY;
  92                         } else{
  93                                 help = true;
  94                         }
  95                         break;
  96
  97                 case 'V':
  98                         l = script_unhexlify(buf, sizeof(buf), optarg);
  99                         if (!l)
 100                                 help=true;
 101
 102                         odhcp6c_add_state(STATE_VENDORCLASS, buf, l);
 103
 104                         break;
 105                 case 'P':
 106                         if (ia_pd_mode == IA_MODE_NONE)
 107                                 ia_pd_mode = IA_MODE_TRY;
 108
 109                         if (allow_slaac_only >= 0 && allow_slaac_only < 10)
 110                                 allow_slaac_only = 10;
 111
 112                         char *iaid_begin;
 113                         int iaid_len = 0;
 114
 115                         int prefix_length = strtoul(optarg, &iaid_begin, 10);
 116
 117                         if (*iaid_begin != '\0' && *iaid_begin != ',' && *iaid_begin != ':') {
 118                                 syslog(LOG_ERR, "invalid argument: '%s'", optarg);
 119                                 return 1;
 120                         }
 121
 122                         struct odhcp6c_request_prefix prefix = { 0, prefix_length };
 123
 124                         if (*iaid_begin == ',' && (iaid_len = strlen(iaid_begin)) > 1)
 125                                 memcpy(&prefix.iaid, iaid_begin + 1, iaid_len > 4 ? 4 : iaid_len);
 126                         else if (*iaid_begin == ':')
 127                                 prefix.iaid = htonl((uint32_t)strtoul(&iaid_begin[1], NULL, 16));
 128                         else
 129                                 prefix.iaid = htonl(++ia_pd_iaid_index);
 130
 131                         odhcp6c_add_state(STATE_IA_PD_INIT, &prefix, sizeof(prefix));
 132
 133                         break;
 134
 135                 case 'F':
 136                         allow_slaac_only = -1;
 137                         ia_pd_mode = IA_MODE_FORCE;
 138                         break;
 139
 140                 case 'c':
 141                         l = script_unhexlify(&buf[4], sizeof(buf) - 4, optarg);
 142                         if (l > 0) {
 143                                 buf[0] = 0;
 144                                 buf[1] = DHCPV6_OPT_CLIENTID;
 145                                 buf[2] = 0;
 146                                 buf[3] = l;
 147                                 odhcp6c_add_state(STATE_CLIENT_ID, buf, l + 4);
 148                         } else {
 149                                 help = true;
 150                         }
 151                         break;
 152
 153                 case 'i':
 154                         if (inet_pton(AF_INET6, optarg, &ifid) != 1)
 155                                 help = true;
 156                         break;
 157
 158                 case 'r':
 159                         optpos = optarg;
 160                         while (optpos[0]) {
 161                                 opttype = htons(strtoul(optarg, &optpos, 10));
 162                                 if (optpos == optarg)
 163                                         break;
 164                                 else if (optpos[0])
 165                                         optarg = &optpos[1];
 166                                 odhcp6c_add_state(STATE_ORO, &opttype, 2);
 167                         }
 168                         break;
 169
 170                 case 'R':
 171                         client_options |= DHCPV6_STRICT_OPTIONS;
 172                         break;
 173
 174                 case 'u':
 175                         optlen = htons(strlen(optarg));
 176                         odhcp6c_add_state(STATE_USERCLASS, &optlen, 2);
 177                         odhcp6c_add_state(STATE_USERCLASS, optarg, strlen(optarg));
 178                         break;
 179
 180                 case 's':
 181                         script = optarg;
 182                         break;
 183
 184                 case 'k':
 185                         release = false;
 186                         break;
 187
 188                 case 't':
 189                         sol_timeout = atoi(optarg);
 190                         break;
 191
 192                 case 'm':
 193                         min_update_interval = atoi(optarg);
 194                         break;
 195
 196                 case 'e':
 197                         logopt |= LOG_PERROR;
 198                         break;
 199
 200                 case 'd':
 201                         daemonize = true;
 202                         break;
 203
 204                 case 'p':
 205                         pidfile = optarg;
 206                         break;
 207
 208                 case 'f':
 209                         client_options &= ~DHCPV6_CLIENT_FQDN;
 210                         break;
 211
 212                 case 'a':
 213                         client_options &= ~DHCPV6_ACCEPT_RECONFIGURE;
 214                         break;
 215
 216                 case 'v':
 217                         ++verbosity;
 218                         break;
 219
 220                 default:
 221                         help = true;
 222                         break;
 223                 }
 224         }
 225
 226         if (allow_slaac_only > 0)
 227                 script_sync_delay = allow_slaac_only;
 228
 229         openlog("odhcp6c", logopt, LOG_DAEMON);
 230         if (!verbosity)
 231                 setlogmask(LOG_UPTO(LOG_WARNING));
 232
 233         const char *ifname = argv[optind];
 234
 235         if (help || !ifname)
 236                 return usage();
 237
 238         signal(SIGIO, sighandler);
 239         signal(SIGHUP, sighandler);
 240         signal(SIGINT, sighandler);
 241         signal(SIGTERM, sighandler);
 242         signal(SIGUSR1, sighandler);
 243         signal(SIGUSR2, sighandler);
 244
 245         if ((urandom_fd = open("/dev/urandom", O_CLOEXEC | O_RDONLY)) < 0 ||
 246                         init_dhcpv6(ifname, client_options, sol_timeout) ||
 247                         ra_init(ifname, &ifid) || script_init(script, ifname)) {
 248                 syslog(LOG_ERR, "failed to initialize: %s", strerror(errno));
 249                 return 3;
 250         }
 251
 252         if (daemonize) {
 253                 openlog("odhcp6c", LOG_PID, LOG_DAEMON); // Disable LOG_PERROR
 254                 if (daemon(0, 0)) {
 255                         syslog(LOG_ERR, "Failed to daemonize: %s",
 256                                         strerror(errno));
 257                         return 4;
 258                 }
 259
 260                 if (!pidfile) {
 261                         snprintf((char*)buf, sizeof(buf), "/var/run/odhcp6c.%s.pid", ifname);
 262                         pidfile = (char*)buf;
 263                 }
 264
 265                 FILE *fp = fopen(pidfile, "w");
 266                 if (fp) {
 267                         fprintf(fp, "%i\n", getpid());
 268                         fclose(fp);
 269                 }
 270         }
 271
 272         script_call("started", 0, false);
 273
 274         while (!signal_term) { // Main logic
 275                 odhcp6c_clear_state(STATE_SERVER_ID);
 276                 odhcp6c_clear_state(STATE_SERVER_ADDR);
 277                 odhcp6c_clear_state(STATE_IA_NA);
 278                 odhcp6c_clear_state(STATE_IA_PD);
 279                 odhcp6c_clear_state(STATE_SNTP_IP);
 280                 odhcp6c_clear_state(STATE_NTP_IP);
 281                 odhcp6c_clear_state(STATE_NTP_FQDN);
 282                 odhcp6c_clear_state(STATE_SIP_IP);
 283                 odhcp6c_clear_state(STATE_SIP_FQDN);
 284                 bound = false;
 285
 286                 syslog(LOG_NOTICE, "(re)starting transaction on %s", ifname);
 287
 288                 signal_usr1 = signal_usr2 = false;
 289                 int mode = dhcpv6_set_ia_mode(ia_na_mode, ia_pd_mode);
 290                 if (mode != DHCPV6_STATELESS)
 291                         mode = dhcpv6_request(DHCPV6_MSG_SOLICIT);
 292                 odhcp6c_signal_process();
 293
 294                 if (mode < 0)
 295                         continue;
 296
 297                 do {
 298                         int res = dhcpv6_request(mode == DHCPV6_STATELESS ?
 299                                         DHCPV6_MSG_INFO_REQ : DHCPV6_MSG_REQUEST);
 300                         bool signalled = odhcp6c_signal_process();
 301
 302                         if (res > 0)
 303                                 break;
 304                         else if (signalled) {
 305                                 mode = -1;
 306                                 break;
 307                         }
 308
 309                         mode = dhcpv6_promote_server_cand();
 310                 } while (mode > DHCPV6_UNKNOWN);
 311
 312                 if (mode < 0)
 313                         continue;
 314
 315                 switch (mode) {
 316                 case DHCPV6_STATELESS:
 317                         bound = true;
 318                         syslog(LOG_NOTICE, "entering stateless-mode on %s", ifname);
 319
 320                         while (!signal_usr2 && !signal_term) {
 321                                 signal_usr1 = false;
 322                                 script_call("informed", script_sync_delay, true);
 323
 324                                 int res = dhcpv6_poll_reconfigure();
 325                                 odhcp6c_signal_process();
 326
 327                                 if (res > 0)
 328                                         continue;
 329
 330                                 if (signal_usr1) {
 331                                         signal_usr1 = false; // Acknowledged
 332                                         continue;
 333                                 }
 334                                 if (signal_usr2 || signal_term)
 335                                         break;
 336
 337                                 res = dhcpv6_request(DHCPV6_MSG_INFO_REQ);
 338                                 odhcp6c_signal_process();
 339                                 if (signal_usr1)
 340                                         continue;
 341                                 else if (res < 0)
 342                                         break;
 343                         }
 344                         break;
 345
 346                 case DHCPV6_STATEFUL:
 347                         bound = true;
 348                         script_call("bound", script_sync_delay, true);
 349                         syslog(LOG_NOTICE, "entering stateful-mode on %s", ifname);
 350
 351                         while (!signal_usr2 && !signal_term) {
 352                                 // Renew Cycle
 353                                 // Wait for T1 to expire or until we get a reconfigure
 354                                 int res = dhcpv6_poll_reconfigure();
 355                                 odhcp6c_signal_process();
 356                                 if (res > 0) {
 357                                         script_call("updated", 0, false);
 358                                         continue;
 359                                 }
 360
 361                                 // Handle signal, if necessary
 362                                 if (signal_usr1)
 363                                         signal_usr1 = false; // Acknowledged
 364                                 if (signal_usr2 || signal_term)
 365                                         break; // Other signal type
 366
 367                                 // Send renew as T1 expired
 368                                 res = dhcpv6_request(DHCPV6_MSG_RENEW);
 369                                 odhcp6c_signal_process();
 370                                 if (res > 0) { // Renew was succesfull
 371                                         // Publish updates
 372                                         script_call("updated", 0, false);
 373                                         continue; // Renew was successful
 374                                 }
 375
 376                                 odhcp6c_clear_state(STATE_SERVER_ID); // Remove binding
 377                                 odhcp6c_clear_state(STATE_SERVER_ADDR);
 378
 379                                 size_t ia_pd_len, ia_na_len;
 380                                 odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
 381                                 odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
 382
 383                                 if (ia_pd_len == 0 && ia_na_len == 0)
 384                                         break;
 385
 386                                 // If we have IAs, try rebind otherwise restart
 387                                 res = dhcpv6_request(DHCPV6_MSG_REBIND);
 388                                 odhcp6c_signal_process();
 389
 390                                 if (res > 0)
 391                                         script_call("rebound", 0, true);
 392                                 else {
 393                                         break;
 394                                 }
 395                         }
 396                         break;
 397
 398                 default:
 399                         break;
 400                 }
 401
 402                 odhcp6c_expire();
 403
 404                 size_t ia_pd_len, ia_na_len, server_id_len;
 405                 odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
 406                 odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
 407                 odhcp6c_get_state(STATE_SERVER_ID, &server_id_len);
 408
 409                 // Add all prefixes to lost prefixes
 410                 bound = false;
 411                 script_call("unbound", 0, true);
 412
 413                 if (server_id_len > 0 && (ia_pd_len > 0 || ia_na_len > 0) && release)
 414                         dhcpv6_request(DHCPV6_MSG_RELEASE);
 415
 416                 odhcp6c_clear_state(STATE_IA_NA);
 417                 odhcp6c_clear_state(STATE_IA_PD);
 418         }
 419
 420         script_call("stopped", 0, true);
 421         return 0;
 422 }
 423
 424
 425 static int usage(void)
 426 {
 427         const char buf[] =
 428         "Usage: odhcp6c [options] <interface>\n"
 429         "\nFeature options:\n"
 430         "       -S <time>       Wait at least <time> sec for a DHCP-server (0)\n"
 431         "       -N <mode>       Mode for requesting addresses [try|force|none]\n"
 432         "       -P <length>     Request IPv6-Prefix (0 = auto)\n"
 433         "       -F              Force IPv6-Prefix\n"
 434         "       -V <class>      Set vendor-class option (base-16 encoded)\n"
 435         "       -u <user-class> Set user-class option string\n"
 436         "       -c <clientid>   Override client-ID (base-16 encoded 16-bit type + value)\n"
 437         "       -i <iface-id>   Use a custom interface identifier for RA handling\n"
 438         "       -r <options>    Options to be requested (comma-separated)\n"
 439         "       -R              Do not request any options except those specified with -r\n"
 440         "       -s <script>     Status update script (/usr/sbin/odhcp6c-update)\n"
 441         "       -a              Don't send Accept Reconfigure option\n"
 442         "       -f              Don't send Client FQDN option\n"
 443         "       -k              Don't send a RELEASE when stopping\n"
 444         "       -t <seconds>    Maximum timeout for DHCPv6-SOLICIT (120)\n"
 445         "       -m <seconds>    Minimum time between accepting updates (30)\n"
 446         "\nInvocation options:\n"
 447         "       -p <pidfile>    Set pidfile (/var/run/odhcp6c.pid)\n"
 448         "       -d              Daemonize\n"
 449         "       -e              Write logmessages to stderr\n"
 450         "       -v              Increase logging verbosity\n"
 451         "       -h              Show this help\n\n";
 452         fputs(buf, stderr);
 453         return 1;
 454 }
 455
 456
 457 // Don't want to pull-in librt and libpthread just for a monotonic clock...
 458 uint64_t odhcp6c_get_milli_time(void)
 459 {
 460         struct timespec t = {0, 0};
 461         syscall(SYS_clock_gettime, CLOCK_MONOTONIC, &t);
 462         return ((uint64_t)t.tv_sec) * 1000 + ((uint64_t)t.tv_nsec) / 1000000;
 463 }
 464
 465
 466 static uint8_t* odhcp6c_resize_state(enum odhcp6c_state state, ssize_t len)
 467 {
 468         if (len == 0)
 469                 return state_data[state] + state_len[state];
 470         else if (state_len[state] + len > 1024)
 471                 return NULL;
 472
 473         uint8_t *n = realloc(state_data[state], state_len[state] + len);
 474         if (n || state_len[state] + len == 0) {
 475                 state_data[state] = n;
 476                 n += state_len[state];
 477                 state_len[state] += len;
 478         }
 479         return n;
 480 }
 481
 482
 483 bool odhcp6c_signal_process(void)
 484 {
 485         while (signal_io) {
 486                 signal_io = false;
 487
 488                 bool ra_updated = ra_process();
 489
 490                 if (ra_link_up()) {
 491                         signal_usr2 = true;
 492                         ra = false;
 493                 }
 494
 495                 if (ra_updated && (bound || allow_slaac_only >= 0)) {
 496                         script_call("ra-updated", (!ra && !bound) ?
 497                                         script_sync_delay : script_accu_delay, false);
 498                         ra = true;
 499                 }
 500         }
 501
 502         return signal_usr1 || signal_usr2 || signal_term;
 503 }
 504
 505
 506 void odhcp6c_clear_state(enum odhcp6c_state state)
 507 {
 508         state_len[state] = 0;
 509 }
 510
 511
 512 void odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len)
 513 {
 514         uint8_t *n = odhcp6c_resize_state(state, len);
 515         if (n)
 516                 memcpy(n, data, len);
 517 }
 518
 519 int odhcp6c_insert_state(enum odhcp6c_state state, size_t offset, const void *data, size_t len)
 520 {
 521         ssize_t len_after = state_len[state] - offset;
 522         if (len_after < 0)
 523                 return -1;
 524
 525         uint8_t *n = odhcp6c_resize_state(state, len);
 526         if (n) {
 527                 uint8_t *sdata = state_data[state];
 528
 529                 memmove(sdata + offset + len, sdata + offset, len_after);
 530                 memcpy(sdata + offset, data, len);
 531         }
 532
 533         return 0;
 534 }
 535
 536 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len)
 537 {
 538         uint8_t *data = state_data[state];
 539         ssize_t len_after = state_len[state] - (offset + len);
 540         if (len_after < 0)
 541                 return state_len[state];
 542
 543         memmove(data + offset, data + offset + len, len_after);
 544         return state_len[state] -= len;
 545 }
 546
 547
 548 void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len)
 549 {
 550         *len = state_len[state];
 551         void *data = state_data[state];
 552
 553         state_len[state] = 0;
 554         state_data[state] = NULL;
 555
 556         return data;
 557 }
 558
 559
 560 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len)
 561 {
 562         *len = state_len[state];
 563         return state_data[state];
 564 }
 565
 566
 567 static struct odhcp6c_entry* odhcp6c_find_entry(enum odhcp6c_state state, const struct odhcp6c_entry *new)
 568 {
 569         size_t len, cmplen = offsetof(struct odhcp6c_entry, target) + ((new->length + 7) / 8);
 570         uint8_t *start = odhcp6c_get_state(state, &len);
 571
 572         for (struct odhcp6c_entry *c = (struct odhcp6c_entry*)start;
 573                         (uint8_t*)c < &start[len] && &c->auxtarget[c->auxlen] <= &start[len];
 574                         c = (struct odhcp6c_entry*)(&c->auxtarget[c->auxlen]))
 575                 if (!memcmp(c, new, cmplen) && !memcmp(c->auxtarget, new->auxtarget, new->auxlen))
 576                         return c;
 577
 578         return NULL;
 579 }
 580
 581
 582 bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new,
 583                 uint32_t safe, bool filterexcess)
 584 {
 585         size_t len;
 586         struct odhcp6c_entry *x = odhcp6c_find_entry(state, new);
 587         uint8_t *start = odhcp6c_get_state(state, &len);
 588
 589         if (x && x->valid > new->valid && new->valid < safe)
 590                 new->valid = safe;
 591
 592         if (new->valid > 0) {
 593                 if (x) {
 594                         if (filterexcess && new->valid >= x->valid &&
 595                                         new->valid != UINT32_MAX &&
 596                                         new->valid - x->valid < min_update_interval &&
 597                                         new->preferred >= x->preferred &&
 598                                         new->preferred != UINT32_MAX &&
 599                                         new->preferred - x->preferred < min_update_interval)
 600                                 return false;
 601                         x->valid = new->valid;
 602                         x->preferred = new->preferred;
 603                         x->t1 = new->t1;
 604                         x->t2 = new->t2;
 605                         x->iaid = new->iaid;
 606                 } else {
 607                         odhcp6c_add_state(state, new, sizeof(*new) + new->auxlen);
 608                 }
 609         } else if (x) {
 610                 odhcp6c_remove_state(state, ((uint8_t*)x) - start, sizeof(*x) + x->auxlen);
 611         }
 612         return true;
 613 }
 614
 615
 616 static void odhcp6c_expire_list(enum odhcp6c_state state, uint32_t elapsed)
 617 {
 618         size_t len;
 619         uint8_t *start = odhcp6c_get_state(state, &len);
 620         for (struct odhcp6c_entry *c = (struct odhcp6c_entry*)start;
 621                         (uint8_t*)c < &start[len] && &c->auxtarget[c->auxlen] <= &start[len];
 622                         c = (struct odhcp6c_entry*)(&c->auxtarget[c->auxlen])) {
 623                 if (c->t1 < elapsed)
 624                         c->t1 = 0;
 625                 else if (c->t1 != UINT32_MAX)
 626                         c->t1 -= elapsed;
 627
 628                 if (c->t2 < elapsed)
 629                         c->t2 = 0;
 630                 else if (c->t2 != UINT32_MAX)
 631                         c->t2 -= elapsed;
 632
 633                 if (c->preferred < elapsed)
 634                         c->preferred = 0;
 635                 else if (c->preferred != UINT32_MAX)
 636                         c->preferred -= elapsed;
 637
 638                 if (c->valid < elapsed)
 639                         c->valid = 0;
 640                 else if (c->valid != UINT32_MAX)
 641                         c->valid -= elapsed;
 642
 643                 if (!c->valid)
 644                         odhcp6c_remove_state(state, ((uint8_t*)c) - start, sizeof(*c) + c->auxlen);
 645         }
 646 }
 647
 648
 649 void odhcp6c_expire(void)
 650 {
 651         time_t now = odhcp6c_get_milli_time() / 1000;
 652         uint32_t elapsed = (last_update > 0) ? now - last_update : 0;
 653         last_update = now;
 654
 655         odhcp6c_expire_list(STATE_RA_PREFIX, elapsed);
 656         odhcp6c_expire_list(STATE_RA_ROUTE, elapsed);
 657         odhcp6c_expire_list(STATE_RA_DNS, elapsed);
 658         odhcp6c_expire_list(STATE_RA_SEARCH, elapsed);
 659         odhcp6c_expire_list(STATE_IA_NA, elapsed);
 660         odhcp6c_expire_list(STATE_IA_PD, elapsed);
 661 }
 662
 663
 664 uint32_t odhcp6c_elapsed(void)
 665 {
 666         return odhcp6c_get_milli_time() / 1000 - last_update;
 667 }
 668
 669
 670 int odhcp6c_random(void *buf, size_t len)
 671 {
 672         return read(urandom_fd, buf, len);
 673 }
 674
 675 bool odhcp6c_is_bound(void)
 676 {
 677         return bound;
 678 }
 679
 680 static void sighandler(int signal)
 681 {
 682         if (signal == SIGUSR1)
 683                 signal_usr1 = true;
 684         else if (signal == SIGUSR2)
 685                 signal_usr2 = true;
 686         else if (signal == SIGIO)
 687                 signal_io = true;
 688         else
 689                 signal_term = true;
 690 }