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         unsigned int ra_options = RA_RDNSS_DEFAULT_LIFETIME;
  78
  79         while ((c = getopt(argc, argv, "S::N:V:P:FB:c:i:r:Ru:s:kt:m:Lhedp:fav")) != -1) {
  80                 switch (c) {
  81                 case 'S':
  82                         allow_slaac_only = (optarg) ? atoi(optarg) : -1;
  83                         break;
  84
  85                 case 'N':
  86                         if (!strcmp(optarg, "force")) {
  87                                 ia_na_mode = IA_MODE_FORCE;
  88                                 allow_slaac_only = -1;
  89                         } else if (!strcmp(optarg, "none")) {
  90                                 ia_na_mode = IA_MODE_NONE;
  91                         } else if (!strcmp(optarg, "try")) {
  92                                 ia_na_mode = IA_MODE_TRY;
  93                         } else{
  94                                 help = true;
  95                         }
  96                         break;
  97
  98                 case 'V':
  99                         l = script_unhexlify(buf, sizeof(buf), optarg);
 100                         if (!l)
 101                                 help=true;
 102
 103                         odhcp6c_add_state(STATE_VENDORCLASS, buf, l);
 104
 105                         break;
 106                 case 'P':
 107                         if (ia_pd_mode == IA_MODE_NONE)
 108                                 ia_pd_mode = IA_MODE_TRY;
 109
 110                         if (allow_slaac_only >= 0 && allow_slaac_only < 10)
 111                                 allow_slaac_only = 10;
 112
 113                         char *iaid_begin;
 114                         int iaid_len = 0;
 115
 116                         int prefix_length = strtoul(optarg, &iaid_begin, 10);
 117
 118                         if (*iaid_begin != '\0' && *iaid_begin != ',' && *iaid_begin != ':') {
 119                                 syslog(LOG_ERR, "invalid argument: '%s'", optarg);
 120                                 return 1;
 121                         }
 122
 123                         struct odhcp6c_request_prefix prefix = { 0, prefix_length };
 124
 125                         if (*iaid_begin == ',' && (iaid_len = strlen(iaid_begin)) > 1)
 126                                 memcpy(&prefix.iaid, iaid_begin + 1, iaid_len > 4 ? 4 : iaid_len);
 127                         else if (*iaid_begin == ':')
 128                                 prefix.iaid = htonl((uint32_t)strtoul(&iaid_begin[1], NULL, 16));
 129                         else
 130                                 prefix.iaid = htonl(++ia_pd_iaid_index);
 131
 132                         odhcp6c_add_state(STATE_IA_PD_INIT, &prefix, sizeof(prefix));
 133
 134                         break;
 135
 136                 case 'F':
 137                         allow_slaac_only = -1;
 138                         ia_pd_mode = IA_MODE_FORCE;
 139                         break;
 140
 141                 case 'c':
 142                         l = script_unhexlify(&buf[4], sizeof(buf) - 4, optarg);
 143                         if (l > 0) {
 144                                 buf[0] = 0;
 145                                 buf[1] = DHCPV6_OPT_CLIENTID;
 146                                 buf[2] = 0;
 147                                 buf[3] = l;
 148                                 odhcp6c_add_state(STATE_CLIENT_ID, buf, l + 4);
 149                         } else {
 150                                 help = true;
 151                         }
 152                         break;
 153
 154                 case 'i':
 155                         if (inet_pton(AF_INET6, optarg, &ifid) != 1)
 156                                 help = true;
 157                         break;
 158
 159                 case 'r':
 160                         optpos = optarg;
 161                         while (optpos[0]) {
 162                                 opttype = htons(strtoul(optarg, &optpos, 10));
 163                                 if (optpos == optarg)
 164                                         break;
 165                                 else if (optpos[0])
 166                                         optarg = &optpos[1];
 167                                 odhcp6c_add_state(STATE_ORO, &opttype, 2);
 168                         }
 169                         break;
 170
 171                 case 'R':
 172                         client_options |= DHCPV6_STRICT_OPTIONS;
 173                         break;
 174
 175                 case 'u':
 176                         optlen = htons(strlen(optarg));
 177                         odhcp6c_add_state(STATE_USERCLASS, &optlen, 2);
 178                         odhcp6c_add_state(STATE_USERCLASS, optarg, strlen(optarg));
 179                         break;
 180
 181                 case 's':
 182                         script = optarg;
 183                         break;
 184
 185                 case 'k':
 186                         release = false;
 187                         break;
 188
 189                 case 't':
 190                         sol_timeout = atoi(optarg);
 191                         break;
 192
 193                 case 'm':
 194                         min_update_interval = atoi(optarg);
 195                         break;
 196
 197                 case 'L':
 198                         ra_options &= ~RA_RDNSS_DEFAULT_LIFETIME;
 199                         break;
 200
 201                 case 'e':
 202                         logopt |= LOG_PERROR;
 203                         break;
 204
 205                 case 'd':
 206                         daemonize = true;
 207                         break;
 208
 209                 case 'p':
 210                         pidfile = optarg;
 211                         break;
 212
 213                 case 'f':
 214                         client_options &= ~DHCPV6_CLIENT_FQDN;
 215                         break;
 216
 217                 case 'a':
 218                         client_options &= ~DHCPV6_ACCEPT_RECONFIGURE;
 219                         break;
 220
 221                 case 'v':
 222                         ++verbosity;
 223                         break;
 224
 225                 default:
 226                         help = true;
 227                         break;
 228                 }
 229         }
 230
 231         if (allow_slaac_only > 0)
 232                 script_sync_delay = allow_slaac_only;
 233
 234         openlog("odhcp6c", logopt, LOG_DAEMON);
 235         if (!verbosity)
 236                 setlogmask(LOG_UPTO(LOG_WARNING));
 237
 238         const char *ifname = argv[optind];
 239
 240         if (help || !ifname)
 241                 return usage();
 242
 243         signal(SIGIO, sighandler);
 244         signal(SIGHUP, sighandler);
 245         signal(SIGINT, sighandler);
 246         signal(SIGTERM, sighandler);
 247         signal(SIGUSR1, sighandler);
 248         signal(SIGUSR2, sighandler);
 249
 250         if ((urandom_fd = open("/dev/urandom", O_CLOEXEC | O_RDONLY)) < 0 ||
 251                         init_dhcpv6(ifname, client_options, sol_timeout) ||
 252                         ra_init(ifname, &ifid, ra_options) ||
 253                         script_init(script, ifname)) {
 254                 syslog(LOG_ERR, "failed to initialize: %s", strerror(errno));
 255                 return 3;
 256         }
 257
 258         if (daemonize) {
 259                 openlog("odhcp6c", LOG_PID, LOG_DAEMON); // Disable LOG_PERROR
 260                 if (daemon(0, 0)) {
 261                         syslog(LOG_ERR, "Failed to daemonize: %s",
 262                                         strerror(errno));
 263                         return 4;
 264                 }
 265
 266                 if (!pidfile) {
 267                         snprintf((char*)buf, sizeof(buf), "/var/run/odhcp6c.%s.pid", ifname);
 268                         pidfile = (char*)buf;
 269                 }
 270
 271                 FILE *fp = fopen(pidfile, "w");
 272                 if (fp) {
 273                         fprintf(fp, "%i\n", getpid());
 274                         fclose(fp);
 275                 }
 276         }
 277
 278         script_call("started", 0, false);
 279
 280         while (!signal_term) { // Main logic
 281                 odhcp6c_clear_state(STATE_SERVER_ID);
 282                 odhcp6c_clear_state(STATE_SERVER_ADDR);
 283                 odhcp6c_clear_state(STATE_IA_NA);
 284                 odhcp6c_clear_state(STATE_IA_PD);
 285                 odhcp6c_clear_state(STATE_SNTP_IP);
 286                 odhcp6c_clear_state(STATE_NTP_IP);
 287                 odhcp6c_clear_state(STATE_NTP_FQDN);
 288                 odhcp6c_clear_state(STATE_SIP_IP);
 289                 odhcp6c_clear_state(STATE_SIP_FQDN);
 290                 bound = false;
 291
 292                 syslog(LOG_NOTICE, "(re)starting transaction on %s", ifname);
 293
 294                 signal_usr1 = signal_usr2 = false;
 295                 int mode = dhcpv6_set_ia_mode(ia_na_mode, ia_pd_mode);
 296                 if (mode != DHCPV6_STATELESS)
 297                         mode = dhcpv6_request(DHCPV6_MSG_SOLICIT);
 298                 odhcp6c_signal_process();
 299
 300                 if (mode < 0)
 301                         continue;
 302
 303                 do {
 304                         int res = dhcpv6_request(mode == DHCPV6_STATELESS ?
 305                                         DHCPV6_MSG_INFO_REQ : DHCPV6_MSG_REQUEST);
 306                         bool signalled = odhcp6c_signal_process();
 307
 308                         if (res > 0)
 309                                 break;
 310                         else if (signalled) {
 311                                 mode = -1;
 312                                 break;
 313                         }
 314
 315                         mode = dhcpv6_promote_server_cand();
 316                 } while (mode > DHCPV6_UNKNOWN);
 317
 318                 if (mode < 0)
 319                         continue;
 320
 321                 switch (mode) {
 322                 case DHCPV6_STATELESS:
 323                         bound = true;
 324                         syslog(LOG_NOTICE, "entering stateless-mode on %s", ifname);
 325
 326                         while (!signal_usr2 && !signal_term) {
 327                                 signal_usr1 = false;
 328                                 script_call("informed", script_sync_delay, true);
 329
 330                                 int res = dhcpv6_poll_reconfigure();
 331                                 odhcp6c_signal_process();
 332
 333                                 if (res > 0)
 334                                         continue;
 335
 336                                 if (signal_usr1) {
 337                                         signal_usr1 = false; // Acknowledged
 338                                         continue;
 339                                 }
 340                                 if (signal_usr2 || signal_term)
 341                                         break;
 342
 343                                 res = dhcpv6_request(DHCPV6_MSG_INFO_REQ);
 344                                 odhcp6c_signal_process();
 345                                 if (signal_usr1)
 346                                         continue;
 347                                 else if (res < 0)
 348                                         break;
 349                         }
 350                         break;
 351
 352                 case DHCPV6_STATEFUL:
 353                         bound = true;
 354                         script_call("bound", script_sync_delay, true);
 355                         syslog(LOG_NOTICE, "entering stateful-mode on %s", ifname);
 356
 357                         while (!signal_usr2 && !signal_term) {
 358                                 // Renew Cycle
 359                                 // Wait for T1 to expire or until we get a reconfigure
 360                                 int res = dhcpv6_poll_reconfigure();
 361                                 odhcp6c_signal_process();
 362                                 if (res > 0) {
 363                                         script_call("updated", 0, false);
 364                                         continue;
 365                                 }
 366
 367                                 // Handle signal, if necessary
 368                                 if (signal_usr1)
 369                                         signal_usr1 = false; // Acknowledged
 370                                 if (signal_usr2 || signal_term)
 371                                         break; // Other signal type
 372
 373                                 // Send renew as T1 expired
 374                                 res = dhcpv6_request(DHCPV6_MSG_RENEW);
 375                                 odhcp6c_signal_process();
 376                                 if (res > 0) { // Renew was succesfull
 377                                         // Publish updates
 378                                         script_call("updated", 0, false);
 379                                         continue; // Renew was successful
 380                                 }
 381
 382                                 odhcp6c_clear_state(STATE_SERVER_ID); // Remove binding
 383                                 odhcp6c_clear_state(STATE_SERVER_ADDR);
 384
 385                                 size_t ia_pd_len, ia_na_len;
 386                                 odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
 387                                 odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
 388
 389                                 if (ia_pd_len == 0 && ia_na_len == 0)
 390                                         break;
 391
 392                                 // If we have IAs, try rebind otherwise restart
 393                                 res = dhcpv6_request(DHCPV6_MSG_REBIND);
 394                                 odhcp6c_signal_process();
 395
 396                                 if (res > 0)
 397                                         script_call("rebound", 0, true);
 398                                 else {
 399                                         break;
 400                                 }
 401                         }
 402                         break;
 403
 404                 default:
 405                         break;
 406                 }
 407
 408                 odhcp6c_expire();
 409
 410                 size_t ia_pd_len, ia_na_len, server_id_len;
 411                 odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
 412                 odhcp6c_get_state(STATE_IA_NA, &ia_na_len);
 413                 odhcp6c_get_state(STATE_SERVER_ID, &server_id_len);
 414
 415                 // Add all prefixes to lost prefixes
 416                 bound = false;
 417                 script_call("unbound", 0, true);
 418
 419                 if (server_id_len > 0 && (ia_pd_len > 0 || ia_na_len > 0) && release)
 420                         dhcpv6_request(DHCPV6_MSG_RELEASE);
 421
 422                 odhcp6c_clear_state(STATE_IA_NA);
 423                 odhcp6c_clear_state(STATE_IA_PD);
 424         }
 425
 426         script_call("stopped", 0, true);
 427         return 0;
 428 }
 429
 430
 431 static int usage(void)
 432 {
 433         const char buf[] =
 434         "Usage: odhcp6c [options] <interface>\n"
 435         "\nFeature options:\n"
 436         "       -S <time>       Wait at least <time> sec for a DHCP-server (0)\n"
 437         "       -N <mode>       Mode for requesting addresses [try|force|none]\n"
 438         "       -P <length>     Request IPv6-Prefix (0 = auto)\n"
 439         "       -F              Force IPv6-Prefix\n"
 440         "       -V <class>      Set vendor-class option (base-16 encoded)\n"
 441         "       -u <user-class> Set user-class option string\n"
 442         "       -c <clientid>   Override client-ID (base-16 encoded 16-bit type + value)\n"
 443         "       -i <iface-id>   Use a custom interface identifier for RA handling\n"
 444         "       -r <options>    Options to be requested (comma-separated)\n"
 445         "       -R              Do not request any options except those specified with -r\n"
 446         "       -s <script>     Status update script (/usr/sbin/odhcp6c-update)\n"
 447         "       -a              Don't send Accept Reconfigure option\n"
 448         "       -f              Don't send Client FQDN option\n"
 449         "       -k              Don't send a RELEASE when stopping\n"
 450         "       -t <seconds>    Maximum timeout for DHCPv6-SOLICIT (120)\n"
 451         "       -m <seconds>    Minimum time between accepting updates (30)\n"
 452         "       -L              Ignore default lifetime for RDNSS records\n"
 453         "\nInvocation options:\n"
 454         "       -p <pidfile>    Set pidfile (/var/run/odhcp6c.pid)\n"
 455         "       -d              Daemonize\n"
 456         "       -e              Write logmessages to stderr\n"
 457         "       -v              Increase logging verbosity\n"
 458         "       -h              Show this help\n\n";
 459         fputs(buf, stderr);
 460         return 1;
 461 }
 462
 463
 464 // Don't want to pull-in librt and libpthread just for a monotonic clock...
 465 uint64_t odhcp6c_get_milli_time(void)
 466 {
 467         struct timespec t = {0, 0};
 468         syscall(SYS_clock_gettime, CLOCK_MONOTONIC, &t);
 469         return ((uint64_t)t.tv_sec) * 1000 + ((uint64_t)t.tv_nsec) / 1000000;
 470 }
 471
 472
 473 static uint8_t* odhcp6c_resize_state(enum odhcp6c_state state, ssize_t len)
 474 {
 475         if (len == 0)
 476                 return state_data[state] + state_len[state];
 477         else if (state_len[state] + len > 1024)
 478                 return NULL;
 479
 480         uint8_t *n = realloc(state_data[state], state_len[state] + len);
 481         if (n || state_len[state] + len == 0) {
 482                 state_data[state] = n;
 483                 n += state_len[state];
 484                 state_len[state] += len;
 485         }
 486         return n;
 487 }
 488
 489
 490 bool odhcp6c_signal_process(void)
 491 {
 492         while (signal_io) {
 493                 signal_io = false;
 494
 495                 bool ra_updated = ra_process();
 496
 497                 if (ra_link_up()) {
 498                         signal_usr2 = true;
 499                         ra = false;
 500                 }
 501
 502                 if (ra_updated && (bound || allow_slaac_only >= 0)) {
 503                         script_call("ra-updated", (!ra && !bound) ?
 504                                         script_sync_delay : script_accu_delay, false);
 505                         ra = true;
 506                 }
 507         }
 508
 509         return signal_usr1 || signal_usr2 || signal_term;
 510 }
 511
 512
 513 void odhcp6c_clear_state(enum odhcp6c_state state)
 514 {
 515         state_len[state] = 0;
 516 }
 517
 518
 519 void odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len)
 520 {
 521         uint8_t *n = odhcp6c_resize_state(state, len);
 522         if (n)
 523                 memcpy(n, data, len);
 524 }
 525
 526 int odhcp6c_insert_state(enum odhcp6c_state state, size_t offset, const void *data, size_t len)
 527 {
 528         ssize_t len_after = state_len[state] - offset;
 529         if (len_after < 0)
 530                 return -1;
 531
 532         uint8_t *n = odhcp6c_resize_state(state, len);
 533         if (n) {
 534                 uint8_t *sdata = state_data[state];
 535
 536                 memmove(sdata + offset + len, sdata + offset, len_after);
 537                 memcpy(sdata + offset, data, len);
 538         }
 539
 540         return 0;
 541 }
 542
 543 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len)
 544 {
 545         uint8_t *data = state_data[state];
 546         ssize_t len_after = state_len[state] - (offset + len);
 547         if (len_after < 0)
 548                 return state_len[state];
 549
 550         memmove(data + offset, data + offset + len, len_after);
 551         return state_len[state] -= len;
 552 }
 553
 554
 555 void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len)
 556 {
 557         *len = state_len[state];
 558         void *data = state_data[state];
 559
 560         state_len[state] = 0;
 561         state_data[state] = NULL;
 562
 563         return data;
 564 }
 565
 566
 567 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len)
 568 {
 569         *len = state_len[state];
 570         return state_data[state];
 571 }
 572
 573
 574 static struct odhcp6c_entry* odhcp6c_find_entry(enum odhcp6c_state state, const struct odhcp6c_entry *new)
 575 {
 576         size_t len, cmplen = offsetof(struct odhcp6c_entry, target) + ((new->length + 7) / 8);
 577         uint8_t *start = odhcp6c_get_state(state, &len);
 578
 579         for (struct odhcp6c_entry *c = (struct odhcp6c_entry*)start;
 580                         (uint8_t*)c < &start[len] &&
 581                         (uint8_t*)odhcp6c_next_entry(c) <= &start[len];
 582                         c = odhcp6c_next_entry(c))
 583                 if (!memcmp(c, new, cmplen) && !memcmp(c->auxtarget, new->auxtarget, new->auxlen))
 584                         return c;
 585
 586         return NULL;
 587 }
 588
 589
 590 bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new,
 591                 uint32_t safe, bool filterexcess)
 592 {
 593         size_t len;
 594         struct odhcp6c_entry *x = odhcp6c_find_entry(state, new);
 595         uint8_t *start = odhcp6c_get_state(state, &len);
 596
 597         if (x && x->valid > new->valid && new->valid < safe)
 598                 new->valid = safe;
 599
 600         if (new->valid > 0) {
 601                 if (x) {
 602                         if (filterexcess && new->valid >= x->valid &&
 603                                         new->valid != UINT32_MAX &&
 604                                         new->valid - x->valid < min_update_interval &&
 605                                         new->preferred >= x->preferred &&
 606                                         new->preferred != UINT32_MAX &&
 607                                         new->preferred - x->preferred < min_update_interval)
 608                                 return false;
 609                         x->valid = new->valid;
 610                         x->preferred = new->preferred;
 611                         x->t1 = new->t1;
 612                         x->t2 = new->t2;
 613                         x->iaid = new->iaid;
 614                 } else {
 615                         odhcp6c_add_state(state, new, odhcp6c_entry_size(new));
 616                 }
 617         } else if (x) {
 618                 odhcp6c_remove_state(state, ((uint8_t*)x) - start, odhcp6c_entry_size(x));
 619         }
 620         return true;
 621 }
 622
 623
 624 static void odhcp6c_expire_list(enum odhcp6c_state state, uint32_t elapsed)
 625 {
 626         size_t len;
 627         uint8_t *start = odhcp6c_get_state(state, &len);
 628         for (struct odhcp6c_entry *c = (struct odhcp6c_entry*)start;
 629                         (uint8_t*)c < &start[len] &&
 630                         (uint8_t*)odhcp6c_next_entry(c) <= &start[len];
 631                         ) {
 632                 if (c->t1 < elapsed)
 633                         c->t1 = 0;
 634                 else if (c->t1 != UINT32_MAX)
 635                         c->t1 -= elapsed;
 636
 637                 if (c->t2 < elapsed)
 638                         c->t2 = 0;
 639                 else if (c->t2 != UINT32_MAX)
 640                         c->t2 -= elapsed;
 641
 642                 if (c->preferred < elapsed)
 643                         c->preferred = 0;
 644                 else if (c->preferred != UINT32_MAX)
 645                         c->preferred -= elapsed;
 646
 647                 if (c->valid < elapsed)
 648                         c->valid = 0;
 649                 else if (c->valid != UINT32_MAX)
 650                         c->valid -= elapsed;
 651
 652                 if (!c->valid) {
 653                         odhcp6c_remove_state(state, ((uint8_t*)c) - start, odhcp6c_entry_size(c));
 654                         start = odhcp6c_get_state(state, &len);
 655                 } else {
 656                         c = odhcp6c_next_entry(c);
 657                 }
 658         }
 659 }
 660
 661
 662 void odhcp6c_expire(void)
 663 {
 664         time_t now = odhcp6c_get_milli_time() / 1000;
 665         uint32_t elapsed = (last_update > 0) ? now - last_update : 0;
 666         last_update = now;
 667
 668         odhcp6c_expire_list(STATE_RA_PREFIX, elapsed);
 669         odhcp6c_expire_list(STATE_RA_ROUTE, elapsed);
 670         odhcp6c_expire_list(STATE_RA_DNS, elapsed);
 671         odhcp6c_expire_list(STATE_RA_SEARCH, elapsed);
 672         odhcp6c_expire_list(STATE_IA_NA, elapsed);
 673         odhcp6c_expire_list(STATE_IA_PD, elapsed);
 674 }
 675
 676
 677 uint32_t odhcp6c_elapsed(void)
 678 {
 679         return odhcp6c_get_milli_time() / 1000 - last_update;
 680 }
 681
 682
 683 int odhcp6c_random(void *buf, size_t len)
 684 {
 685         return read(urandom_fd, buf, len);
 686 }
 687
 688 bool odhcp6c_is_bound(void)
 689 {
 690         return bound;
 691 }
 692
 693 static void sighandler(int signal)
 694 {
 695         if (signal == SIGUSR1)
 696                 signal_usr1 = true;
 697         else if (signal == SIGUSR2)
 698                 signal_usr2 = true;
 699         else if (signal == SIGIO)
 700                 signal_io = true;
 701         else
 702                 signal_term = true;
 703 }