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
 103 static sig_atomic_t do_dump, do_exit;
 104 static struct pidfh *pfh;
 105
 106 static char **autoifprobe(void);
 107 static int ifconfig(char *ifname);
 108 static int init_capabilities(void);
 109 static int make_packet(struct ifinfo *);
 110 static struct timespec *rtsol_check_timer(void);
 111
 112 static void set_dumpfile(int);
 113 static void set_exit(int);
 114 static void usage(const char *progname);
 115
 116 int
 117 main(int argc, char **argv)
 118 {
 119         struct kevent events[2];
 120         FILE *dumpfp;
 121         struct ifinfo *ifi;
 122         struct timespec *timeout;
 123         const char *opts, *pidfilepath, *progname;
 124         int ch, error, kq, once, rcvsock, rtsock;
 125
 126         progname = basename(argv[0]);
 127         if (strcmp(progname, "rtsold") == 0) {
 128                 opts = "adDfFm1M:O:p:R:u";
 129                 once = 0;
 130                 pidfilepath = NULL;
 131         } else {
 132                 opts = "adDFM:O:R:u";
 133                 fflag = 1;
 134                 once = 1;
 135         }
 136
 137         while ((ch = getopt(argc, argv, opts)) != -1) {
 138                 switch (ch) {
 139                 case 'a':
 140                         aflag = 1;
 141                         break;
 142                 case 'd':
 143                         dflag += 1;
 144                         break;
 145                 case 'D':
 146                         dflag += 2;
 147                         break;
 148                 case 'f':
 149                         fflag = 1;
 150                         break;
 151                 case 'F':
 152                         Fflag = 1;
 153                         break;
 154                 case 'm':
 155                         mobile_node = 1;
 156                         break;
 157                 case '1':
 158                         once = 1;
 159                         break;
 160                 case 'M':
 161                         managedconf_script = optarg;
 162                         break;
 163                 case 'O':
 164                         otherconf_script = optarg;
 165                         break;
 166                 case 'p':
 167                         pidfilepath = optarg;
 168                         break;
 169                 case 'R':
 170                         resolvconf_script = optarg;
 171                         break;
 172                 case 'u':
 173                         uflag = 1;
 174                         break;
 175                 default:
 176                         usage(progname);
 177                 }
 178         }
 179         argc -= optind;
 180         argv += optind;
 181
 182         if ((!aflag && argc == 0) || (aflag && argc != 0))
 183                 usage(progname);
 184
 185         /* Generate maximum time in timespec. */
 186         tm_max.tv_sec = (-1) & ~((time_t)1 << ((sizeof(tm_max.tv_sec) * 8) - 1));
 187         tm_max.tv_nsec = (-1) & ~((long)1 << ((sizeof(tm_max.tv_nsec) * 8) - 1));
 188
 189         /* set log level */
 190         if (dflag > 1)
 191                 log_upto = LOG_DEBUG;
 192         else if (dflag > 0)
 193                 log_upto = LOG_INFO;
 194         else
 195                 log_upto = LOG_NOTICE;
 196
 197         if (managedconf_script != NULL && *managedconf_script != '/')
 198                 errx(1, "configuration script (%s) must be an absolute path",
 199                     managedconf_script);
 200         if (otherconf_script != NULL && *otherconf_script != '/')
 201                 errx(1, "configuration script (%s) must be an absolute path",
 202                     otherconf_script);
 203         if (*resolvconf_script != '/')
 204                 errx(1, "configuration script (%s) must be an absolute path",
 205                     resolvconf_script);
 206
 207         if (!fflag) {
 208                 pfh = pidfile_open(pidfilepath, 0644, NULL);
 209                 if (pfh == NULL)
 210                         errx(1, "failed to open pidfile: %s", strerror(errno));
 211                 if (daemon(0, 0) != 0)
 212                         errx(1, "failed to daemonize");
 213         }
 214
 215         if ((error = init_capabilities()) != 0)
 216                 err(1, "failed to initialize capabilities");
 217
 218         if (!fflag) {
 219                 cap_openlog(capsyslog, progname, LOG_NDELAY | LOG_PID,
 220                     LOG_DAEMON);
 221                 if (log_upto >= 0)
 222                         (void)cap_setlogmask(capsyslog, LOG_UPTO(log_upto));
 223                 (void)signal(SIGTERM, set_exit);
 224                 (void)signal(SIGINT, set_exit);
 225                 (void)signal(SIGUSR1, set_dumpfile);
 226                 dumpfp = rtsold_init_dumpfile(RTSOL_DUMPFILE);
 227         } else
 228                 dumpfp = NULL;
 229
 230         kq = kqueue();
 231         if (kq < 0) {
 232                 warnmsg(LOG_ERR, __func__, "failed to create a kqueue: %s",
 233                     strerror(errno));
 234                 exit(1);
 235         }
 236
 237         /* Open global sockets and register for read events. */
 238         if ((rtsock = rtsock_open()) < 0) {
 239                 warnmsg(LOG_ERR, __func__, "failed to open routing socket");
 240                 exit(1);
 241         }
 242         if ((rcvsock = recvsockopen()) < 0) {
 243                 warnmsg(LOG_ERR, __func__, "failed to open receive socket");
 244                 exit(1);
 245         }
 246         EV_SET(&events[0], rtsock, EVFILT_READ, EV_ADD, 0, 0, NULL);
 247         EV_SET(&events[1], rcvsock, EVFILT_READ, EV_ADD, 0, 0, NULL);
 248         if (kevent(kq, events, 2, NULL, 0, NULL) < 0) {
 249                 warnmsg(LOG_ERR, __func__, "kevent(): %s", strerror(errno));
 250                 exit(1);
 251         }
 252
 253         /* Probe network interfaces and set up tracking info. */
 254         if (ifinit() != 0) {
 255                 warnmsg(LOG_ERR, __func__, "failed to initialize interfaces");
 256                 exit(1);
 257         }
 258         if (aflag)
 259                 argv = autoifprobe();
 260         while (argv && *argv) {
 261                 if (ifconfig(*argv)) {
 262                         warnmsg(LOG_ERR, __func__,
 263                             "failed to initialize %s", *argv);
 264                         exit(1);
 265                 }
 266                 argv++;
 267         }
 268
 269         /* Write to our pidfile. */
 270         if (pfh != NULL && pidfile_write(pfh) != 0) {
 271                 warnmsg(LOG_ERR, __func__,
 272                     "failed to open pidfile: %s", strerror(errno));
 273                 exit(1);
 274         }
 275
 276         /* Enter capability mode. */
 277         caph_cache_catpages();
 278         if (caph_enter_casper() != 0) {
 279                 warnmsg(LOG_ERR, __func__, "caph_enter(): %s", strerror(errno));
 280                 exit(1);
 281         }
 282
 283         for (;;) {
 284                 if (do_exit) {
 285                         /* Handle SIGTERM, SIGINT. */
 286                         if (pfh != NULL)
 287                                 pidfile_remove(pfh);
 288                         break;
 289                 }
 290                 if (do_dump) {
 291                         /* Handle SIGUSR1. */
 292                         do_dump = 0;
 293                         if (dumpfp != NULL)
 294                                 rtsold_dump(dumpfp);
 295                 }
 296
 297                 timeout = rtsol_check_timer();
 298
 299                 if (once) {
 300                         /* if we have no timeout, we are done (or failed) */
 301                         if (timeout == NULL)
 302                                 break;
 303
 304                         /* if all interfaces have got RA packet, we are done */
 305                         TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
 306                                 if (ifi->state != IFS_DOWN && ifi->racnt == 0)
 307                                         break;
 308                         }
 309                         if (ifi == NULL)
 310                                 break;
 311                 }
 312
 313                 error = kevent(kq, NULL, 0, &events[0], 1, timeout);
 314                 if (error < 1) {
 315                         if (error < 0 && errno != EINTR)
 316                                 warnmsg(LOG_ERR, __func__, "kevent(): %s",
 317                                     strerror(errno));
 318                         continue;
 319                 }
 320
 321                 if (events[0].ident == (uintptr_t)rtsock)
 322                         rtsock_input(rtsock);
 323                 else
 324                         rtsol_input(rcvsock);
 325         }
 326
 327         return (0);
 328 }
 329
 330 static int
 331 init_capabilities(void)
 332 {
 333 #ifdef WITH_CASPER
 334         const char *const scripts[] =
 335             { resolvconf_script, managedconf_script, otherconf_script };
 336         const char *scripts_set[nitems(scripts)];
 337         cap_channel_t *capcasper;
 338         nvlist_t *limits;
 339         int count;
 340
 341         capcasper = cap_init();
 342         if (capcasper == NULL)
 343                 return (-1);
 344
 345         capllflags = cap_service_open(capcasper, "rtsold.llflags");
 346         if (capllflags == NULL)
 347                 return (-1);
 348
 349         capscript = cap_service_open(capcasper, "rtsold.script");
 350         if (capscript == NULL)
 351                 return (-1);
 352         count = 0;
 353         for (size_t i = 0; i < nitems(scripts); i++)
 354                 if (scripts[i] != NULL)
 355                         scripts_set[count++] = scripts[i];
 356         limits = nvlist_create(0);
 357         nvlist_add_string_array(limits, "scripts", scripts_set, count);
 358         if (cap_limit_set(capscript, limits) != 0)
 359                 return (-1);
 360
 361         capsendmsg = cap_service_open(capcasper, "rtsold.sendmsg");
 362         if (capsendmsg == NULL)
 363                 return (-1);
 364
 365         if (!fflag) {
 366                 capsyslog = cap_service_open(capcasper, "system.syslog");
 367                 if (capsyslog == NULL)
 368                         return (-1);
 369         }
 370
 371         cap_close(capcasper);
 372 #endif /* WITH_CASPER */
 373         return (0);
 374 }
 375
 376 static int
 377 ifconfig(char *ifname)
 378 {
 379         struct ifinfo *ifi;
 380         struct sockaddr_dl *sdl;
 381         int flags;
 382
 383         ifi = NULL;
 384         if ((sdl = if_nametosdl(ifname)) == NULL) {
 385                 warnmsg(LOG_ERR, __func__,
 386                     "failed to get link layer information for %s", ifname);
 387                 goto bad;
 388         }
 389         if (find_ifinfo(sdl->sdl_index)) {
 390                 warnmsg(LOG_ERR, __func__,
 391                     "interface %s was already configured", ifname);
 392                 goto bad;
 393         }
 394
 395         if (Fflag) {
 396                 struct in6_ndireq nd;
 397                 int s;
 398
 399                 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 400                         warnmsg(LOG_ERR, __func__, "socket() failed.");
 401                         goto bad;
 402                 }
 403                 memset(&nd, 0, sizeof(nd));
 404                 strlcpy(nd.ifname, ifname, sizeof(nd.ifname));
 405                 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
 406                         warnmsg(LOG_ERR, __func__,
 407                             "cannot get accept_rtadv flag");
 408                         (void)close(s);
 409                         goto bad;
 410                 }
 411                 nd.ndi.flags |= ND6_IFF_ACCEPT_RTADV;
 412                 if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd) < 0) {
 413                         warnmsg(LOG_ERR, __func__,
 414                             "cannot set accept_rtadv flag");
 415                         (void)close(s);
 416                         goto bad;
 417                 }
 418                 (void)close(s);
 419         }
 420
 421         if ((ifi = malloc(sizeof(*ifi))) == NULL) {
 422                 warnmsg(LOG_ERR, __func__, "memory allocation failed");
 423                 goto bad;
 424         }
 425         memset(ifi, 0, sizeof(*ifi));
 426         ifi->sdl = sdl;
 427         ifi->ifi_rdnss = IFI_DNSOPT_STATE_NOINFO;
 428         ifi->ifi_dnssl = IFI_DNSOPT_STATE_NOINFO;
 429         TAILQ_INIT(&ifi->ifi_rainfo);
 430         strlcpy(ifi->ifname, ifname, sizeof(ifi->ifname));
 431
 432         /* construct a router solicitation message */
 433         if (make_packet(ifi))
 434                 goto bad;
 435
 436         /* set link ID of this interface. */
 437 #ifdef HAVE_SCOPELIB
 438         if (inet_zoneid(AF_INET6, 2, ifname, &ifi->linkid))
 439                 goto bad;
 440 #else
 441         /* XXX: assume interface IDs as link IDs */
 442         ifi->linkid = ifi->sdl->sdl_index;
 443 #endif
 444
 445         /*
 446          * check if the interface is available.
 447          * also check if SIOCGIFMEDIA ioctl is OK on the interface.
 448          */
 449         ifi->mediareqok = 1;
 450         ifi->active = interface_status(ifi);
 451         if (!ifi->mediareqok) {
 452                 /*
 453                  * probe routers periodically even if the link status
 454                  * does not change.
 455                  */
 456                 ifi->probeinterval = PROBE_INTERVAL;
 457         }
 458
 459         /* activate interface: interface_up returns 0 on success */
 460         flags = interface_up(ifi->ifname);
 461         if (flags == 0)
 462                 ifi->state = IFS_DELAY;
 463         else if (flags == IFS_TENTATIVE)
 464                 ifi->state = IFS_TENTATIVE;
 465         else
 466                 ifi->state = IFS_DOWN;
 467
 468         rtsol_timer_update(ifi);
 469
 470         TAILQ_INSERT_TAIL(&ifinfo_head, ifi, ifi_next);
 471         return (0);
 472
 473 bad:
 474         free(sdl);
 475         free(ifi);
 476         return (-1);
 477 }
 478
 479 struct rainfo *
 480 find_rainfo(struct ifinfo *ifi, struct sockaddr_in6 *sin6)
 481 {
 482         struct rainfo *rai;
 483
 484         TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next)
 485                 if (memcmp(&rai->rai_saddr.sin6_addr, &sin6->sin6_addr,
 486                     sizeof(rai->rai_saddr.sin6_addr)) == 0)
 487                         return (rai);
 488
 489         return (NULL);
 490 }
 491
 492 struct ifinfo *
 493 find_ifinfo(int ifindex)
 494 {
 495         struct ifinfo *ifi;
 496
 497         TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
 498                 if (ifi->sdl->sdl_index == ifindex)
 499                         return (ifi);
 500         }
 501         return (NULL);
 502 }
 503
 504 static int
 505 make_packet(struct ifinfo *ifi)
 506 {
 507         size_t packlen = sizeof(struct nd_router_solicit), lladdroptlen = 0;
 508         struct nd_router_solicit *rs;
 509         char *buf;
 510
 511         if ((lladdroptlen = lladdropt_length(ifi->sdl)) == 0) {
 512                 warnmsg(LOG_INFO, __func__,
 513                     "link-layer address option has null length"
 514                     " on %s. Treat as not included.", ifi->ifname);
 515         }
 516         packlen += lladdroptlen;
 517         ifi->rs_datalen = packlen;
 518
 519         /* allocate buffer */
 520         if ((buf = malloc(packlen)) == NULL) {
 521                 warnmsg(LOG_ERR, __func__,
 522                     "memory allocation failed for %s", ifi->ifname);
 523                 return (-1);
 524         }
 525         ifi->rs_data = buf;
 526
 527         /* fill in the message */
 528         rs = (struct nd_router_solicit *)buf;
 529         rs->nd_rs_type = ND_ROUTER_SOLICIT;
 530         rs->nd_rs_code = 0;
 531         rs->nd_rs_cksum = 0;
 532         rs->nd_rs_reserved = 0;
 533         buf += sizeof(*rs);
 534
 535         /* fill in source link-layer address option */
 536         if (lladdroptlen)
 537                 lladdropt_fill(ifi->sdl, (struct nd_opt_hdr *)buf);
 538
 539         return (0);
 540 }
 541
 542 static struct timespec *
 543 rtsol_check_timer(void)
 544 {
 545         static struct timespec returnval;
 546         struct timespec now, rtsol_timer;
 547         struct ifinfo *ifi;
 548         struct rainfo *rai;
 549         struct ra_opt *rao, *raotmp;
 550         int error, flags;
 551
 552         clock_gettime(CLOCK_MONOTONIC_FAST, &now);
 553
 554         rtsol_timer = tm_max;
 555
 556         TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
 557                 if (TS_CMP(&ifi->expire, &now, <=)) {
 558                         warnmsg(LOG_DEBUG, __func__, "timer expiration on %s, "
 559                             "state = %d", ifi->ifname, ifi->state);
 560
 561                         while((rai = TAILQ_FIRST(&ifi->ifi_rainfo)) != NULL) {
 562                                 /* Remove all RA options. */
 563                                 TAILQ_REMOVE(&ifi->ifi_rainfo, rai, rai_next);
 564                                 while ((rao = TAILQ_FIRST(&rai->rai_ra_opt)) !=
 565                                     NULL) {
 566                                         TAILQ_REMOVE(&rai->rai_ra_opt, rao,
 567                                             rao_next);
 568                                         if (rao->rao_msg != NULL)
 569                                                 free(rao->rao_msg);
 570                                         free(rao);
 571                                 }
 572                                 free(rai);
 573                         }
 574                         switch (ifi->state) {
 575                         case IFS_DOWN:
 576                         case IFS_TENTATIVE:
 577                                 /* interface_up returns 0 on success */
 578                                 flags = interface_up(ifi->ifname);
 579                                 if (flags == 0)
 580                                         ifi->state = IFS_DELAY;
 581                                 else if (flags == IFS_TENTATIVE)
 582                                         ifi->state = IFS_TENTATIVE;
 583                                 else
 584                                         ifi->state = IFS_DOWN;
 585                                 break;
 586                         case IFS_IDLE:
 587                         {
 588                                 int oldstatus = ifi->active;
 589                                 int probe = 0;
 590
 591                                 ifi->active = interface_status(ifi);
 592
 593                                 if (oldstatus != ifi->active) {
 594                                         warnmsg(LOG_DEBUG, __func__,
 595                                             "%s status is changed"
 596                                             " from %d to %d",
 597                                             ifi->ifname,
 598                                             oldstatus, ifi->active);
 599                                         probe = 1;
 600                                         ifi->state = IFS_DELAY;
 601                                 } else if (ifi->probeinterval &&
 602                                     (ifi->probetimer -=
 603                                     ifi->timer.tv_sec) <= 0) {
 604                                         /* probe timer expired */
 605                                         ifi->probetimer =
 606                                             ifi->probeinterval;
 607                                         probe = 1;
 608                                         ifi->state = IFS_PROBE;
 609                                 }
 610
 611                                 /*
 612                                  * If we need a probe, clear the previous
 613                                  * status wrt the "managed/other" configuration.
 614                                  */
 615                                 if (probe) {
 616                                         ifi->managedconfig = 0;
 617                                         ifi->otherconfig = 0;
 618                                 }
 619                                 if (probe && mobile_node) {
 620                                         error = cap_probe_defrouters(capsendmsg,
 621                                             ifi);
 622                                         if (error != 0)
 623                                                 warnmsg(LOG_DEBUG, __func__,
 624                                             "failed to probe routers: %d",
 625                                                     error);
 626                                 }
 627                                 break;
 628                         }
 629                         case IFS_DELAY:
 630                                 ifi->state = IFS_PROBE;
 631                                 (void)cap_rssend(capsendmsg, ifi);
 632                                 break;
 633                         case IFS_PROBE:
 634                                 if (ifi->probes < MAX_RTR_SOLICITATIONS)
 635                                         (void)cap_rssend(capsendmsg, ifi);
 636                                 else {
 637                                         warnmsg(LOG_INFO, __func__,
 638                                             "No answer after sending %d RSs",
 639                                             ifi->probes);
 640                                         ifi->probes = 0;
 641                                         ifi->state = IFS_IDLE;
 642                                 }
 643                                 break;
 644                         }
 645                         rtsol_timer_update(ifi);
 646                 } else {
 647                         /* Expiration check for RA options. */
 648                         int expire = 0;
 649
 650                         TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next) {
 651                                 TAILQ_FOREACH_SAFE(rao, &rai->rai_ra_opt,
 652                                     rao_next, raotmp) {
 653                                         warnmsg(LOG_DEBUG, __func__,
 654                                             "RA expiration timer: "
 655                                             "type=%d, msg=%s, expire=%s",
 656                                             rao->rao_type, (char *)rao->rao_msg,
 657                                                 sec2str(&rao->rao_expire));
 658                                         if (TS_CMP(&now, &rao->rao_expire,
 659                                             >=)) {
 660                                                 warnmsg(LOG_DEBUG, __func__,
 661                                                     "RA expiration timer: "
 662                                                     "expired.");
 663                                                 TAILQ_REMOVE(&rai->rai_ra_opt,
 664                                                     rao, rao_next);
 665                                                 if (rao->rao_msg != NULL)
 666                                                         free(rao->rao_msg);
 667                                                 free(rao);
 668                                                 expire = 1;
 669                                         }
 670                                 }
 671                         }
 672                         if (expire)
 673                                 ra_opt_handler(ifi);
 674                 }
 675                 if (TS_CMP(&ifi->expire, &rtsol_timer, <))
 676                         rtsol_timer = ifi->expire;
 677         }
 678
 679         if (TS_CMP(&rtsol_timer, &tm_max, ==)) {
 680                 warnmsg(LOG_DEBUG, __func__, "there is no timer");
 681                 return (NULL);
 682         } else if (TS_CMP(&rtsol_timer, &now, <))
 683                 /* this may occur when the interval is too small */
 684                 returnval.tv_sec = returnval.tv_nsec = 0;
 685         else
 686                 TS_SUB(&rtsol_timer, &now, &returnval);
 687
 688         now.tv_sec += returnval.tv_sec;
 689         now.tv_nsec += returnval.tv_nsec;
 690         warnmsg(LOG_DEBUG, __func__, "New timer is %s",
 691             sec2str(&now));
 692
 693         return (&returnval);
 694 }
 695
 696 void
 697 rtsol_timer_update(struct ifinfo *ifi)
 698 {
 699 #define MILLION 1000000
 700 #define DADRETRY 10             /* XXX: adhoc */
 701         long interval;
 702         struct timespec now;
 703
 704         bzero(&ifi->timer, sizeof(ifi->timer));
 705
 706         switch (ifi->state) {
 707         case IFS_DOWN:
 708         case IFS_TENTATIVE:
 709                 if (++ifi->dadcount > DADRETRY) {
 710                         ifi->dadcount = 0;
 711                         ifi->timer.tv_sec = PROBE_INTERVAL;
 712                 } else
 713                         ifi->timer.tv_sec = 1;
 714                 break;
 715         case IFS_IDLE:
 716                 if (mobile_node)
 717                         /* XXX should be configurable */
 718                         ifi->timer.tv_sec = 3;
 719                 else
 720                         ifi->timer = tm_max;    /* stop timer(valid?) */
 721                 break;
 722         case IFS_DELAY:
 723                 interval = arc4random_uniform(MAX_RTR_SOLICITATION_DELAY * MILLION);
 724                 ifi->timer.tv_sec = interval / MILLION;
 725                 ifi->timer.tv_nsec = (interval % MILLION) * 1000;
 726                 break;
 727         case IFS_PROBE:
 728                 if (ifi->probes < MAX_RTR_SOLICITATIONS)
 729                         ifi->timer.tv_sec = RTR_SOLICITATION_INTERVAL;
 730                 else
 731                         /*
 732                          * After sending MAX_RTR_SOLICITATIONS solicitations,
 733                          * we're just waiting for possible replies; there
 734                          * will be no more solicitation.  Thus, we change
 735                          * the timer value to MAX_RTR_SOLICITATION_DELAY based
 736                          * on RFC 2461, Section 6.3.7.
 737                          */
 738                         ifi->timer.tv_sec = MAX_RTR_SOLICITATION_DELAY;
 739                 break;
 740         default:
 741                 warnmsg(LOG_ERR, __func__,
 742                     "illegal interface state(%d) on %s",
 743                     ifi->state, ifi->ifname);
 744                 return;
 745         }
 746
 747         /* reset the timer */
 748         if (TS_CMP(&ifi->timer, &tm_max, ==)) {
 749                 ifi->expire = tm_max;
 750                 warnmsg(LOG_DEBUG, __func__,
 751                     "stop timer for %s", ifi->ifname);
 752         } else {
 753                 clock_gettime(CLOCK_MONOTONIC_FAST, &now);
 754                 TS_ADD(&now, &ifi->timer, &ifi->expire);
 755
 756                 now.tv_sec += ifi->timer.tv_sec;
 757                 now.tv_nsec += ifi->timer.tv_nsec;
 758                 warnmsg(LOG_DEBUG, __func__, "set timer for %s to %s",
 759                     ifi->ifname, sec2str(&now));
 760         }
 761
 762 #undef MILLION
 763 }
 764
 765 static void
 766 set_dumpfile(int sig __unused)
 767 {
 768
 769         do_dump = 1;
 770 }
 771
 772 static void
 773 set_exit(int sig __unused)
 774 {
 775
 776         do_exit = 1;
 777 }
 778
 779 static void
 780 usage(const char *progname)
 781 {
 782
 783         if (strcmp(progname, "rtsold") == 0) {
 784                 fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] "
 785                     "[-p pidfile] [-R script-name] interface ...\n");
 786                 fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] "
 787                     "[-p pidfile] [-R script-name] -a\n");
 788         } else {
 789                 fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
 790                     "[-p pidfile] [-R script-name] interface ...\n");
 791                 fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
 792                     "[-p pidfile] [-R script-name] -a\n");
 793         }
 794         exit(1);
 795 }
 796
 797 void
 798 warnmsg(int priority, const char *func, const char *msg, ...)
 799 {
 800         va_list ap;
 801         char buf[BUFSIZ];
 802
 803         va_start(ap, msg);
 804         if (fflag) {
 805                 if (priority <= log_upto)
 806                         vwarnx(msg, ap);
 807         } else {
 808                 snprintf(buf, sizeof(buf), "<%s> %s", func, msg);
 809                 msg = buf;
 810                 cap_vsyslog(capsyslog, priority, msg, ap);
 811         }
 812         va_end(ap);
 813 }
 814
 815 /*
 816  * return a list of interfaces which is suitable to sending an RS.
 817  */
 818 static char **
 819 autoifprobe(void)
 820 {
 821         static char **argv = NULL;
 822         static int n = 0;
 823         char **a;
 824         int s = 0, i, found;
 825         struct ifaddrs *ifap, *ifa;
 826         struct in6_ndireq nd;
 827
 828         /* initialize */
 829         while (n--)
 830                 free(argv[n]);
 831         if (argv) {
 832                 free(argv);
 833                 argv = NULL;
 834         }
 835         n = 0;
 836
 837         if (getifaddrs(&ifap) != 0)
 838                 return (NULL);
 839
 840         if (!Fflag && (s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 841                 warnmsg(LOG_ERR, __func__, "socket");
 842                 exit(1);
 843         }
 844
 845         /* find an ethernet */
 846         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 847                 if ((ifa->ifa_flags & IFF_UP) == 0)
 848                         continue;
 849                 if ((ifa->ifa_flags & IFF_POINTOPOINT) != 0)
 850                         continue;
 851                 if ((ifa->ifa_flags & IFF_LOOPBACK) != 0)
 852                         continue;
 853                 if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
 854                         continue;
 855
 856                 if (ifa->ifa_addr->sa_family != AF_INET6)
 857                         continue;
 858
 859                 found = 0;
 860                 for (i = 0; i < n; i++) {
 861                         if (strcmp(argv[i], ifa->ifa_name) == 0) {
 862                                 found++;
 863                                 break;
 864                         }
 865                 }
 866                 if (found)
 867                         continue;
 868
 869                 /*
 870                  * Skip the interfaces which IPv6 and/or accepting RA
 871                  * is disabled.
 872                  */
 873                 if (!Fflag) {
 874                         memset(&nd, 0, sizeof(nd));
 875                         strlcpy(nd.ifname, ifa->ifa_name, sizeof(nd.ifname));
 876                         if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
 877                                 warnmsg(LOG_ERR, __func__,
 878                                         "ioctl(SIOCGIFINFO_IN6)");
 879                                 exit(1);
 880                         }
 881                         if ((nd.ndi.flags & ND6_IFF_IFDISABLED))
 882                                 continue;
 883                         if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV))
 884                                 continue;
 885                 }
 886
 887                 /* if we find multiple candidates, just warn. */
 888                 if (n != 0 && dflag > 1)
 889                         warnmsg(LOG_WARNING, __func__,
 890                                 "multiple interfaces found");
 891
 892                 a = realloc(argv, (n + 1) * sizeof(char *));
 893                 if (a == NULL) {
 894                         warnmsg(LOG_ERR, __func__, "realloc");
 895                         exit(1);
 896                 }
 897                 argv = a;
 898                 argv[n] = strdup(ifa->ifa_name);
 899                 if (!argv[n]) {
 900                         warnmsg(LOG_ERR, __func__, "malloc");
 901                         exit(1);
 902                 }
 903                 n++;
 904         }
 905
 906         if (n) {
 907                 a = realloc(argv, (n + 1) * sizeof(char *));
 908                 if (a == NULL) {
 909                         warnmsg(LOG_ERR, __func__, "realloc");
 910                         exit(1);
 911                 }
 912                 argv = a;
 913                 argv[n] = NULL;
 914
 915                 if (dflag > 0) {
 916                         for (i = 0; i < n; i++)
 917                                 warnmsg(LOG_WARNING, __func__, "probing %s",
 918                                         argv[i]);
 919                 }
 920         }
 921         if (!Fflag)
 922                 close(s);
 923         freeifaddrs(ifap);
 924         return (argv);
 925 }