usr.sbin/rtsold/rtsold.c

   1 /*      $KAME: rtsold.c,v 1.67 2003/05/17 18:16:15 itojun Exp $ */
   2
   3 /*-
   4  * SPDX-License-Identifier: BSD-3-Clause
   5  *
   6  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the project nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * $FreeBSD$
  34  */
  35
  36 #include <sys/param.h>
  37 #include <sys/capsicum.h>
  38 #include <sys/event.h>
  39 #include <sys/ioctl.h>
  40 #include <sys/socket.h>
  41
  42 #include <net/if.h>
  43 #include <net/if_dl.h>
  44
  45 #include <netinet/in.h>
  46 #include <netinet/icmp6.h>
  47 #include <netinet/in_var.h>
  48 #include <arpa/inet.h>
  49
  50 #include <netinet6/nd6.h>
  51
  52 #include <capsicum_helpers.h>
  53 #include <err.h>
  54 #include <errno.h>
  55 #include <ifaddrs.h>
  56 #include <libgen.h>
  57 #include <signal.h>
  58 #include <stdarg.h>
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62 #include <syslog.h>
  63 #include <time.h>
  64 #include <unistd.h>
  65
  66 #include <libcasper.h>
  67 #include <casper/cap_syslog.h>
  68 #include <libutil.h>
  69
  70 #include "rtsold.h"
  71
  72 #define RTSOL_DUMPFILE  "/var/run/rtsold.dump"
  73
  74 struct timespec tm_max;
  75 static int log_upto = 999;
  76 static int fflag = 0;
  77
  78 int Fflag = 0;  /* force setting sysctl parameters */
  79 int aflag = 0;
  80 int dflag = 0;
  81 int uflag = 0;
  82
  83 const char *managedconf_script;
  84 const char *otherconf_script;
  85 const char *resolvconf_script = "/sbin/resolvconf";
  86
  87 cap_channel_t *capllflags, *capscript, *capsendmsg, *capsyslog;
  88
  89 /* protocol constants */
  90 #define MAX_RTR_SOLICITATION_DELAY      1 /* second */
  91 #define RTR_SOLICITATION_INTERVAL       4 /* seconds */
  92 #define MAX_RTR_SOLICITATIONS           3 /* times */
  93
  94 /*
  95  * implementation dependent constants in seconds
  96  * XXX: should be configurable
  97  */
  98 #define PROBE_INTERVAL 60
  99
 100 /* static variables and functions */
 101 static int mobile_node = 0;
 102 static int no_solicitation_delay = 0;
 103
 104 static sig_atomic_t do_dump, do_exit;
 105 static struct pidfh *pfh;
 106
 107 static char **autoifprobe(void);
 108 static int ifconfig(char *ifname);
 109 static int init_capabilities(void);
 110 static int make_packet(struct ifinfo *);
 111 static struct timespec *rtsol_check_timer(void);
 112
 113 static void set_dumpfile(int);
 114 static void set_exit(int);
 115 static void usage(const char *progname);
 116
 117 int
 118 main(int argc, char **argv)
 119 {
 120         struct kevent events[2];
 121         FILE *dumpfp;
 122         struct ifinfo *ifi;
 123         struct timespec *timeout;
 124         const char *opts, *pidfilepath, *progname;
 125         int ch, error, kq, once, rcvsock, rtsock;
 126
 127         progname = basename(argv[0]);
 128         if (strcmp(progname, "rtsold") == 0) {
 129                 opts = "adDfFim1M:O:p:R:u";
 130                 once = 0;
 131                 pidfilepath = NULL;
 132         } else {
 133                 opts = "adDFiM:O:R:u";
 134                 fflag = 1;
 135                 once = 1;
 136         }
 137
 138         while ((ch = getopt(argc, argv, opts)) != -1) {
 139                 switch (ch) {
 140                 case 'a':
 141                         aflag = 1;
 142                         break;
 143                 case 'd':
 144                         dflag += 1;
 145                         break;
 146                 case 'D':
 147                         dflag += 2;
 148                         break;
 149                 case 'f':
 150                         fflag = 1;
 151                         break;
 152                 case 'F':
 153                         Fflag = 1;
 154                         break;
 155                 case 'i':
 156                         no_solicitation_delay = 1;
 157                         break;
 158                 case 'm':
 159                         mobile_node = 1;
 160                         break;
 161                 case '1':
 162                         once = 1;
 163                         break;
 164                 case 'M':
 165                         managedconf_script = optarg;
 166                         break;
 167                 case 'O':
 168                         otherconf_script = optarg;
 169                         break;
 170                 case 'p':
 171                         pidfilepath = optarg;
 172                         break;
 173                 case 'R':
 174                         resolvconf_script = optarg;
 175                         break;
 176                 case 'u':
 177                         uflag = 1;
 178                         break;
 179                 default:
 180                         usage(progname);
 181                 }
 182         }
 183         argc -= optind;
 184         argv += optind;
 185
 186         if ((!aflag && argc == 0) || (aflag && argc != 0))
 187                 usage(progname);
 188
 189         /* Generate maximum time in timespec. */
 190         tm_max.tv_sec = (-1) & ~((time_t)1 << ((sizeof(tm_max.tv_sec) * 8) - 1));
 191         tm_max.tv_nsec = (-1) & ~((long)1 << ((sizeof(tm_max.tv_nsec) * 8) - 1));
 192
 193         /* set log level */
 194         if (dflag > 1)
 195                 log_upto = LOG_DEBUG;
 196         else if (dflag > 0)
 197                 log_upto = LOG_INFO;
 198         else
 199                 log_upto = LOG_NOTICE;
 200
 201         if (managedconf_script != NULL && *managedconf_script != '/')
 202                 errx(1, "configuration script (%s) must be an absolute path",
 203                     managedconf_script);
 204         if (otherconf_script != NULL && *otherconf_script != '/')
 205                 errx(1, "configuration script (%s) must be an absolute path",
 206                     otherconf_script);
 207         if (*resolvconf_script != '/')
 208                 errx(1, "configuration script (%s) must be an absolute path",
 209                     resolvconf_script);
 210
 211         if (!fflag) {
 212                 pfh = pidfile_open(pidfilepath, 0644, NULL);
 213                 if (pfh == NULL)
 214                         errx(1, "failed to open pidfile: %s", strerror(errno));
 215                 if (daemon(0, 0) != 0)
 216                         errx(1, "failed to daemonize");
 217         }
 218
 219         if ((error = init_capabilities()) != 0)
 220                 err(1, "failed to initialize capabilities");
 221
 222         if (!fflag) {
 223                 cap_openlog(capsyslog, progname, LOG_NDELAY | LOG_PID,
 224                     LOG_DAEMON);
 225                 if (log_upto >= 0)
 226                         (void)cap_setlogmask(capsyslog, LOG_UPTO(log_upto));
 227                 (void)signal(SIGTERM, set_exit);
 228                 (void)signal(SIGINT, set_exit);
 229                 (void)signal(SIGUSR1, set_dumpfile);
 230                 dumpfp = rtsold_init_dumpfile(RTSOL_DUMPFILE);
 231         } else
 232                 dumpfp = NULL;
 233
 234         kq = kqueue();
 235         if (kq < 0) {
 236                 warnmsg(LOG_ERR, __func__, "failed to create a kqueue: %s",
 237                     strerror(errno));
 238                 exit(1);
 239         }
 240
 241         /* Open global sockets and register for read events. */
 242         if ((rtsock = rtsock_open()) < 0) {
 243                 warnmsg(LOG_ERR, __func__, "failed to open routing socket");
 244                 exit(1);
 245         }
 246         if ((rcvsock = recvsockopen()) < 0) {
 247                 warnmsg(LOG_ERR, __func__, "failed to open receive socket");
 248                 exit(1);
 249         }
 250         EV_SET(&events[0], rtsock, EVFILT_READ, EV_ADD, 0, 0, NULL);
 251         EV_SET(&events[1], rcvsock, EVFILT_READ, EV_ADD, 0, 0, NULL);
 252         if (kevent(kq, events, 2, NULL, 0, NULL) < 0) {
 253                 warnmsg(LOG_ERR, __func__, "kevent(): %s", strerror(errno));
 254                 exit(1);
 255         }
 256
 257         /* Probe network interfaces and set up tracking info. */
 258         if (ifinit() != 0) {
 259                 warnmsg(LOG_ERR, __func__, "failed to initialize interfaces");
 260                 exit(1);
 261         }
 262         if (aflag)
 263                 argv = autoifprobe();
 264         while (argv && *argv) {
 265                 if (ifconfig(*argv)) {
 266                         warnmsg(LOG_ERR, __func__,
 267                             "failed to initialize %s", *argv);
 268                         exit(1);
 269                 }
 270                 argv++;
 271         }
 272
 273         /* Write to our pidfile. */
 274         if (pfh != NULL && pidfile_write(pfh) != 0) {
 275                 warnmsg(LOG_ERR, __func__,
 276                     "failed to open pidfile: %s", strerror(errno));
 277                 exit(1);
 278         }
 279
 280         /* Enter capability mode. */
 281         caph_cache_catpages();
 282         if (caph_enter_casper() != 0) {
 283                 warnmsg(LOG_ERR, __func__, "caph_enter(): %s", strerror(errno));
 284                 exit(1);
 285         }
 286
 287         for (;;) {
 288                 if (do_exit) {
 289                         /* Handle SIGTERM, SIGINT. */
 290                         if (pfh != NULL)
 291                                 pidfile_remove(pfh);
 292                         break;
 293                 }
 294                 if (do_dump) {
 295                         /* Handle SIGUSR1. */
 296                         do_dump = 0;
 297                         if (dumpfp != NULL)
 298                                 rtsold_dump(dumpfp);
 299                 }
 300
 301                 timeout = rtsol_check_timer();
 302
 303                 if (once) {
 304                         /* if we have no timeout, we are done (or failed) */
 305                         if (timeout == NULL)
 306                                 break;
 307
 308                         /* if all interfaces have got RA packet, we are done */
 309                         TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
 310                                 if (ifi->state != IFS_DOWN && ifi->racnt == 0)
 311                                         break;
 312                         }
 313                         if (ifi == NULL)
 314                                 break;
 315                 }
 316
 317                 error = kevent(kq, NULL, 0, &events[0], 1, timeout);
 318                 if (error < 1) {
 319                         if (error < 0 && errno != EINTR)
 320                                 warnmsg(LOG_ERR, __func__, "kevent(): %s",
 321                                     strerror(errno));
 322                         continue;
 323                 }
 324
 325                 if (events[0].ident == (uintptr_t)rtsock)
 326                         rtsock_input(rtsock);
 327                 else
 328                         rtsol_input(rcvsock);
 329         }
 330
 331         return (0);
 332 }
 333
 334 static int
 335 init_capabilities(void)
 336 {
 337 #ifdef WITH_CASPER
 338         const char *const scripts[] =
 339             { resolvconf_script, managedconf_script, otherconf_script };
 340         cap_channel_t *capcasper;
 341         nvlist_t *limits;
 342
 343         capcasper = cap_init();
 344         if (capcasper == NULL)
 345                 return (-1);
 346
 347         capllflags = cap_service_open(capcasper, "rtsold.llflags");
 348         if (capllflags == NULL)
 349                 return (-1);
 350
 351         capscript = cap_service_open(capcasper, "rtsold.script");
 352         if (capscript == NULL)
 353                 return (-1);
 354         limits = nvlist_create(0);
 355         for (size_t i = 0; i < nitems(scripts); i++)
 356                 if (scripts[i] != NULL)
 357                         nvlist_append_string_array(limits, "scripts",
 358                             scripts[i]);
 359         if (cap_limit_set(capscript, limits) != 0)
 360                 return (-1);
 361
 362         capsendmsg = cap_service_open(capcasper, "rtsold.sendmsg");
 363         if (capsendmsg == NULL)
 364                 return (-1);
 365
 366         if (!fflag) {
 367                 capsyslog = cap_service_open(capcasper, "system.syslog");
 368                 if (capsyslog == NULL)
 369                         return (-1);
 370         }
 371
 372         cap_close(capcasper);
 373 #endif /* WITH_CASPER */
 374         return (0);
 375 }
 376
 377 static int
 378 ifconfig(char *ifname)
 379 {
 380         struct ifinfo *ifi;
 381         struct sockaddr_dl *sdl;
 382         int flags;
 383
 384         ifi = NULL;
 385         if ((sdl = if_nametosdl(ifname)) == NULL) {
 386                 warnmsg(LOG_ERR, __func__,
 387                     "failed to get link layer information for %s", ifname);
 388                 goto bad;
 389         }
 390         if (find_ifinfo(sdl->sdl_index)) {
 391                 warnmsg(LOG_ERR, __func__,
 392                     "interface %s was already configured", ifname);
 393                 goto bad;
 394         }
 395
 396         if (Fflag) {
 397                 struct in6_ndireq nd;
 398                 int s;
 399
 400                 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 401                         warnmsg(LOG_ERR, __func__, "socket() failed.");
 402                         goto bad;
 403                 }
 404                 memset(&nd, 0, sizeof(nd));
 405                 strlcpy(nd.ifname, ifname, sizeof(nd.ifname));
 406                 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
 407                         warnmsg(LOG_ERR, __func__,
 408                             "cannot get accept_rtadv flag");
 409                         (void)close(s);
 410                         goto bad;
 411                 }
 412                 nd.ndi.flags |= ND6_IFF_ACCEPT_RTADV;
 413                 if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd) < 0) {
 414                         warnmsg(LOG_ERR, __func__,
 415                             "cannot set accept_rtadv flag");
 416                         (void)close(s);
 417                         goto bad;
 418                 }
 419                 (void)close(s);
 420         }
 421
 422         if ((ifi = malloc(sizeof(*ifi))) == NULL) {
 423                 warnmsg(LOG_ERR, __func__, "memory allocation failed");
 424                 goto bad;
 425         }
 426         memset(ifi, 0, sizeof(*ifi));
 427         ifi->sdl = sdl;
 428         ifi->ifi_rdnss = IFI_DNSOPT_STATE_NOINFO;
 429         ifi->ifi_dnssl = IFI_DNSOPT_STATE_NOINFO;
 430         TAILQ_INIT(&ifi->ifi_rainfo);
 431         strlcpy(ifi->ifname, ifname, sizeof(ifi->ifname));
 432
 433         /* construct a router solicitation message */
 434         if (make_packet(ifi))
 435                 goto bad;
 436
 437         /* set link ID of this interface. */
 438 #ifdef HAVE_SCOPELIB
 439         if (inet_zoneid(AF_INET6, 2, ifname, &ifi->linkid))
 440                 goto bad;
 441 #else
 442         /* XXX: assume interface IDs as link IDs */
 443         ifi->linkid = ifi->sdl->sdl_index;
 444 #endif
 445
 446         /*
 447          * check if the interface is available.
 448          * also check if SIOCGIFMEDIA ioctl is OK on the interface.
 449          */
 450         ifi->mediareqok = 1;
 451         ifi->active = interface_status(ifi);
 452         if (!ifi->mediareqok) {
 453                 /*
 454                  * probe routers periodically even if the link status
 455                  * does not change.
 456                  */
 457                 ifi->probeinterval = PROBE_INTERVAL;
 458         }
 459
 460         /* activate interface: interface_up returns 0 on success */
 461         flags = interface_up(ifi->ifname);
 462         if (flags == 0)
 463                 ifi->state = IFS_DELAY;
 464         else if (flags == IFS_TENTATIVE)
 465                 ifi->state = IFS_TENTATIVE;
 466         else
 467                 ifi->state = IFS_DOWN;
 468
 469         rtsol_timer_update(ifi);
 470
 471         TAILQ_INSERT_TAIL(&ifinfo_head, ifi, ifi_next);
 472         return (0);
 473
 474 bad:
 475         free(sdl);
 476         free(ifi);
 477         return (-1);
 478 }
 479
 480 struct rainfo *
 481 find_rainfo(struct ifinfo *ifi, struct sockaddr_in6 *sin6)
 482 {
 483         struct rainfo *rai;
 484
 485         TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next)
 486                 if (memcmp(&rai->rai_saddr.sin6_addr, &sin6->sin6_addr,
 487                     sizeof(rai->rai_saddr.sin6_addr)) == 0)
 488                         return (rai);
 489
 490         return (NULL);
 491 }
 492
 493 struct ifinfo *
 494 find_ifinfo(int ifindex)
 495 {
 496         struct ifinfo *ifi;
 497
 498         TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
 499                 if (ifi->sdl->sdl_index == ifindex)
 500                         return (ifi);
 501         }
 502         return (NULL);
 503 }
 504
 505 static int
 506 make_packet(struct ifinfo *ifi)
 507 {
 508         size_t packlen = sizeof(struct nd_router_solicit), lladdroptlen = 0;
 509         struct nd_router_solicit *rs;
 510         char *buf;
 511
 512         if ((lladdroptlen = lladdropt_length(ifi->sdl)) == 0) {
 513                 warnmsg(LOG_INFO, __func__,
 514                     "link-layer address option has null length"
 515                     " on %s. Treat as not included.", ifi->ifname);
 516         }
 517         packlen += lladdroptlen;
 518         ifi->rs_datalen = packlen;
 519
 520         /* allocate buffer */
 521         if ((buf = malloc(packlen)) == NULL) {
 522                 warnmsg(LOG_ERR, __func__,
 523                     "memory allocation failed for %s", ifi->ifname);
 524                 return (-1);
 525         }
 526         ifi->rs_data = buf;
 527
 528         /* fill in the message */
 529         rs = (struct nd_router_solicit *)buf;
 530         rs->nd_rs_type = ND_ROUTER_SOLICIT;
 531         rs->nd_rs_code = 0;
 532         rs->nd_rs_cksum = 0;
 533         rs->nd_rs_reserved = 0;
 534         buf += sizeof(*rs);
 535
 536         /* fill in source link-layer address option */
 537         if (lladdroptlen)
 538                 lladdropt_fill(ifi->sdl, (struct nd_opt_hdr *)buf);
 539
 540         return (0);
 541 }
 542
 543 static struct timespec *
 544 rtsol_check_timer(void)
 545 {
 546         static struct timespec returnval;
 547         struct timespec now, rtsol_timer;
 548         struct ifinfo *ifi;
 549         struct rainfo *rai;
 550         struct ra_opt *rao, *raotmp;
 551         int error, flags;
 552
 553         clock_gettime(CLOCK_MONOTONIC_FAST, &now);
 554
 555         rtsol_timer = tm_max;
 556
 557         TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
 558                 if (TS_CMP(&ifi->expire, &now, <=)) {
 559                         warnmsg(LOG_DEBUG, __func__, "timer expiration on %s, "
 560                             "state = %d", ifi->ifname, ifi->state);
 561
 562                         while((rai = TAILQ_FIRST(&ifi->ifi_rainfo)) != NULL) {
 563                                 /* Remove all RA options. */
 564                                 TAILQ_REMOVE(&ifi->ifi_rainfo, rai, rai_next);
 565                                 while ((rao = TAILQ_FIRST(&rai->rai_ra_opt)) !=
 566                                     NULL) {
 567                                         TAILQ_REMOVE(&rai->rai_ra_opt, rao,
 568                                             rao_next);
 569                                         if (rao->rao_msg != NULL)
 570                                                 free(rao->rao_msg);
 571                                         free(rao);
 572                                 }
 573                                 free(rai);
 574                         }
 575                         switch (ifi->state) {
 576                         case IFS_DOWN:
 577                         case IFS_TENTATIVE:
 578                                 /* interface_up returns 0 on success */
 579                                 flags = interface_up(ifi->ifname);
 580                                 if (flags == 0)
 581                                         ifi->state = IFS_DELAY;
 582                                 else if (flags == IFS_TENTATIVE)
 583                                         ifi->state = IFS_TENTATIVE;
 584                                 else
 585                                         ifi->state = IFS_DOWN;
 586                                 break;
 587                         case IFS_IDLE:
 588                         {
 589                                 int oldstatus = ifi->active;
 590                                 int probe = 0;
 591
 592                                 ifi->active = interface_status(ifi);
 593
 594                                 if (oldstatus != ifi->active) {
 595                                         warnmsg(LOG_DEBUG, __func__,
 596                                             "%s status is changed"
 597                                             " from %d to %d",
 598                                             ifi->ifname,
 599                                             oldstatus, ifi->active);
 600                                         probe = 1;
 601                                         ifi->state = IFS_DELAY;
 602                                 } else if (ifi->probeinterval &&
 603                                     (ifi->probetimer -=
 604                                     ifi->timer.tv_sec) <= 0) {
 605                                         /* probe timer expired */
 606                                         ifi->probetimer =
 607                                             ifi->probeinterval;
 608                                         probe = 1;
 609                                         ifi->state = IFS_PROBE;
 610                                 }
 611
 612                                 /*
 613                                  * If we need a probe, clear the previous
 614                                  * status wrt the "managed/other" configuration.
 615                                  */
 616                                 if (probe) {
 617                                         ifi->managedconfig = 0;
 618                                         ifi->otherconfig = 0;
 619                                 }
 620                                 if (probe && mobile_node) {
 621                                         error = cap_probe_defrouters(capsendmsg,
 622                                             ifi);
 623                                         if (error != 0)
 624                                                 warnmsg(LOG_DEBUG, __func__,
 625                                             "failed to probe routers: %d",
 626                                                     error);
 627                                 }
 628                                 break;
 629                         }
 630                         case IFS_DELAY:
 631                                 ifi->state = IFS_PROBE;
 632                                 (void)cap_rssend(capsendmsg, ifi);
 633                                 break;
 634                         case IFS_PROBE:
 635                                 if (ifi->probes < MAX_RTR_SOLICITATIONS)
 636                                         (void)cap_rssend(capsendmsg, ifi);
 637                                 else {
 638                                         warnmsg(LOG_INFO, __func__,
 639                                             "No answer after sending %d RSs",
 640                                             ifi->probes);
 641                                         ifi->probes = 0;
 642                                         ifi->state = IFS_IDLE;
 643                                 }
 644                                 break;
 645                         }
 646                         rtsol_timer_update(ifi);
 647                 } else {
 648                         /* Expiration check for RA options. */
 649                         int expire = 0;
 650
 651                         TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next) {
 652                                 TAILQ_FOREACH_SAFE(rao, &rai->rai_ra_opt,
 653                                     rao_next, raotmp) {
 654                                         warnmsg(LOG_DEBUG, __func__,
 655                                             "RA expiration timer: "
 656                                             "type=%d, msg=%s, expire=%s",
 657                                             rao->rao_type, (char *)rao->rao_msg,
 658                                                 sec2str(&rao->rao_expire));
 659                                         if (TS_CMP(&now, &rao->rao_expire,
 660                                             >=)) {
 661                                                 warnmsg(LOG_DEBUG, __func__,
 662                                                     "RA expiration timer: "
 663                                                     "expired.");
 664                                                 TAILQ_REMOVE(&rai->rai_ra_opt,
 665                                                     rao, rao_next);
 666                                                 if (rao->rao_msg != NULL)
 667                                                         free(rao->rao_msg);
 668                                                 free(rao);
 669                                                 expire = 1;
 670                                         }
 671                                 }
 672                         }
 673                         if (expire)
 674                                 ra_opt_handler(ifi);
 675                 }
 676                 if (TS_CMP(&ifi->expire, &rtsol_timer, <))
 677                         rtsol_timer = ifi->expire;
 678         }
 679
 680         if (TS_CMP(&rtsol_timer, &tm_max, ==)) {
 681                 warnmsg(LOG_DEBUG, __func__, "there is no timer");
 682                 return (NULL);
 683         } else if (TS_CMP(&rtsol_timer, &now, <))
 684                 /* this may occur when the interval is too small */
 685                 returnval.tv_sec = returnval.tv_nsec = 0;
 686         else
 687                 TS_SUB(&rtsol_timer, &now, &returnval);
 688
 689         now.tv_sec += returnval.tv_sec;
 690         now.tv_nsec += returnval.tv_nsec;
 691         warnmsg(LOG_DEBUG, __func__, "New timer is %s",
 692             sec2str(&now));
 693
 694         return (&returnval);
 695 }
 696
 697 void
 698 rtsol_timer_update(struct ifinfo *ifi)
 699 {
 700 #define MILLION 1000000
 701 #define DADRETRY 10             /* XXX: adhoc */
 702         long interval;
 703         struct timespec now;
 704
 705         bzero(&ifi->timer, sizeof(ifi->timer));
 706
 707         switch (ifi->state) {
 708         case IFS_DOWN:
 709         case IFS_TENTATIVE:
 710                 if (++ifi->dadcount > DADRETRY) {
 711                         ifi->dadcount = 0;
 712                         ifi->timer.tv_sec = PROBE_INTERVAL;
 713                 } else
 714                         ifi->timer.tv_sec = 1;
 715                 break;
 716         case IFS_IDLE:
 717                 if (mobile_node)
 718                         /* XXX should be configurable */
 719                         ifi->timer.tv_sec = 3;
 720                 else
 721                         ifi->timer = tm_max;    /* stop timer(valid?) */
 722                 break;
 723         case IFS_DELAY:
 724                 if (no_solicitation_delay)
 725                         interval = 0;
 726                 else
 727                         interval = arc4random_uniform(MAX_RTR_SOLICITATION_DELAY * MILLION);
 728                 ifi->timer.tv_sec = interval / MILLION;
 729                 ifi->timer.tv_nsec = (interval % MILLION) * 1000;
 730                 break;
 731         case IFS_PROBE:
 732                 if (ifi->probes < MAX_RTR_SOLICITATIONS)
 733                         ifi->timer.tv_sec = RTR_SOLICITATION_INTERVAL;
 734                 else
 735                         /*
 736                          * After sending MAX_RTR_SOLICITATIONS solicitations,
 737                          * we're just waiting for possible replies; there
 738                          * will be no more solicitation.  Thus, we change
 739                          * the timer value to MAX_RTR_SOLICITATION_DELAY based
 740                          * on RFC 2461, Section 6.3.7.
 741                          */
 742                         ifi->timer.tv_sec = MAX_RTR_SOLICITATION_DELAY;
 743                 break;
 744         default:
 745                 warnmsg(LOG_ERR, __func__,
 746                     "illegal interface state(%d) on %s",
 747                     ifi->state, ifi->ifname);
 748                 return;
 749         }
 750
 751         /* reset the timer */
 752         if (TS_CMP(&ifi->timer, &tm_max, ==)) {
 753                 ifi->expire = tm_max;
 754                 warnmsg(LOG_DEBUG, __func__,
 755                     "stop timer for %s", ifi->ifname);
 756         } else {
 757                 clock_gettime(CLOCK_MONOTONIC_FAST, &now);
 758                 TS_ADD(&now, &ifi->timer, &ifi->expire);
 759
 760                 now.tv_sec += ifi->timer.tv_sec;
 761                 now.tv_nsec += ifi->timer.tv_nsec;
 762                 warnmsg(LOG_DEBUG, __func__, "set timer for %s to %s",
 763                     ifi->ifname, sec2str(&now));
 764         }
 765
 766 #undef MILLION
 767 }
 768
 769 static void
 770 set_dumpfile(int sig __unused)
 771 {
 772
 773         do_dump = 1;
 774 }
 775
 776 static void
 777 set_exit(int sig __unused)
 778 {
 779
 780         do_exit = 1;
 781 }
 782
 783 static void
 784 usage(const char *progname)
 785 {
 786
 787         if (strcmp(progname, "rtsold") == 0) {
 788                 fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] "
 789                     "[-p pidfile] [-R script-name] interface ...\n");
 790                 fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] "
 791                     "[-p pidfile] [-R script-name] -a\n");
 792         } else {
 793                 fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
 794                     "[-p pidfile] [-R script-name] interface ...\n");
 795                 fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
 796                     "[-p pidfile] [-R script-name] -a\n");
 797         }
 798         exit(1);
 799 }
 800
 801 void
 802 warnmsg(int priority, const char *func, const char *msg, ...)
 803 {
 804         va_list ap;
 805         char buf[BUFSIZ];
 806
 807         va_start(ap, msg);
 808         if (fflag) {
 809                 if (priority <= log_upto)
 810                         vwarnx(msg, ap);
 811         } else {
 812                 snprintf(buf, sizeof(buf), "<%s> %s", func, msg);
 813                 msg = buf;
 814                 cap_vsyslog(capsyslog, priority, msg, ap);
 815         }
 816         va_end(ap);
 817 }
 818
 819 /*
 820  * return a list of interfaces which is suitable to sending an RS.
 821  */
 822 static char **
 823 autoifprobe(void)
 824 {
 825         static char **argv = NULL;
 826         static int n = 0;
 827         char **a;
 828         int s = 0, i, found;
 829         struct ifaddrs *ifap, *ifa;
 830         struct in6_ndireq nd;
 831
 832         /* initialize */
 833         while (n--)
 834                 free(argv[n]);
 835         if (argv) {
 836                 free(argv);
 837                 argv = NULL;
 838         }
 839         n = 0;
 840
 841         if (getifaddrs(&ifap) != 0)
 842                 return (NULL);
 843
 844         if (!Fflag && (s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 845                 warnmsg(LOG_ERR, __func__, "socket");
 846                 exit(1);
 847         }
 848
 849         /* find an ethernet */
 850         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 851                 if ((ifa->ifa_flags & IFF_UP) == 0)
 852                         continue;
 853                 if ((ifa->ifa_flags & IFF_LOOPBACK) != 0)
 854                         continue;
 855                 if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
 856                         continue;
 857
 858                 if (ifa->ifa_addr->sa_family != AF_INET6)
 859                         continue;
 860
 861                 found = 0;
 862                 for (i = 0; i < n; i++) {
 863                         if (strcmp(argv[i], ifa->ifa_name) == 0) {
 864                                 found++;
 865                                 break;
 866                         }
 867                 }
 868                 if (found)
 869                         continue;
 870
 871                 /*
 872                  * Skip the interfaces which IPv6 and/or accepting RA
 873                  * is disabled.
 874                  */
 875                 if (!Fflag) {
 876                         memset(&nd, 0, sizeof(nd));
 877                         strlcpy(nd.ifname, ifa->ifa_name, sizeof(nd.ifname));
 878                         if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
 879                                 warnmsg(LOG_ERR, __func__,
 880                                         "ioctl(SIOCGIFINFO_IN6)");
 881                                 exit(1);
 882                         }
 883                         if ((nd.ndi.flags & ND6_IFF_IFDISABLED))
 884                                 continue;
 885                         if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV))
 886                                 continue;
 887                 }
 888
 889                 /* if we find multiple candidates, just warn. */
 890                 if (n != 0 && dflag > 1)
 891                         warnmsg(LOG_WARNING, __func__,
 892                                 "multiple interfaces found");
 893
 894                 a = realloc(argv, (n + 1) * sizeof(char *));
 895                 if (a == NULL) {
 896                         warnmsg(LOG_ERR, __func__, "realloc");
 897                         exit(1);
 898                 }
 899                 argv = a;
 900                 argv[n] = strdup(ifa->ifa_name);
 901                 if (!argv[n]) {
 902                         warnmsg(LOG_ERR, __func__, "malloc");
 903                         exit(1);
 904                 }
 905                 n++;
 906         }
 907
 908         if (n) {
 909                 a = realloc(argv, (n + 1) * sizeof(char *));
 910                 if (a == NULL) {
 911                         warnmsg(LOG_ERR, __func__, "realloc");
 912                         exit(1);
 913                 }
 914                 argv = a;
 915                 argv[n] = NULL;
 916
 917                 if (dflag > 0) {
 918                         for (i = 0; i < n; i++)
 919                                 warnmsg(LOG_WARNING, __func__, "probing %s",
 920                                         argv[i]);
 921                 }
 922         }
 923         if (!Fflag)
 924                 close(s);
 925         freeifaddrs(ifap);
 926         return (argv);
 927 }