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 *otherconf_script;
  84 const char *resolvconf_script = "/sbin/resolvconf";
  85
  86 cap_channel_t *capllflags, *capscript, *capsendmsg, *capsyslog;
  87
  88 /* protocol constants */
  89 #define MAX_RTR_SOLICITATION_DELAY      1 /* second */
  90 #define RTR_SOLICITATION_INTERVAL       4 /* seconds */
  91 #define MAX_RTR_SOLICITATIONS           3 /* times */
  92
  93 /*
  94  * implementation dependent constants in seconds
  95  * XXX: should be configurable
  96  */
  97 #define PROBE_INTERVAL 60
  98
  99 /* static variables and functions */
 100 static int mobile_node = 0;
 101
 102 static sig_atomic_t do_dump, do_exit;
 103 static struct pidfh *pfh;
 104
 105 static char **autoifprobe(void);
 106 static int ifconfig(char *ifname);
 107 static int init_capabilities(void);
 108 static int make_packet(struct ifinfo *);
 109 static struct timespec *rtsol_check_timer(void);
 110
 111 static void set_dumpfile(int);
 112 static void set_exit(int);
 113 static void usage(const char *progname);
 114
 115 int
 116 main(int argc, char **argv)
 117 {
 118         struct kevent events[2];
 119         FILE *dumpfp;
 120         struct ifinfo *ifi;
 121         struct timespec *timeout;
 122         const char *opts, *pidfilepath, *progname;
 123         int ch, error, kq, once, rcvsock, rtsock;
 124
 125         progname = basename(argv[0]);
 126         if (strcmp(progname, "rtsold") == 0) {
 127                 opts = "adDfFm1O:p:R:u";
 128                 once = 0;
 129                 pidfilepath = NULL;
 130         } else {
 131                 opts = "adDFO:R:u";
 132                 fflag = 1;
 133                 once = 1;
 134         }
 135
 136         while ((ch = getopt(argc, argv, opts)) != -1) {
 137                 switch (ch) {
 138                 case 'a':
 139                         aflag = 1;
 140                         break;
 141                 case 'd':
 142                         dflag += 1;
 143                         break;
 144                 case 'D':
 145                         dflag += 2;
 146                         break;
 147                 case 'f':
 148                         fflag = 1;
 149                         break;
 150                 case 'F':
 151                         Fflag = 1;
 152                         break;
 153                 case 'm':
 154                         mobile_node = 1;
 155                         break;
 156                 case '1':
 157                         once = 1;
 158                         break;
 159                 case 'O':
 160                         otherconf_script = optarg;
 161                         break;
 162                 case 'p':
 163                         pidfilepath = optarg;
 164                         break;
 165                 case 'R':
 166                         resolvconf_script = optarg;
 167                         break;
 168                 case 'u':
 169                         uflag = 1;
 170                         break;
 171                 default:
 172                         usage(progname);
 173                 }
 174         }
 175         argc -= optind;
 176         argv += optind;
 177
 178         if ((!aflag && argc == 0) || (aflag && argc != 0))
 179                 usage(progname);
 180
 181         /* Generate maximum time in timespec. */
 182         tm_max.tv_sec = (-1) & ~((time_t)1 << ((sizeof(tm_max.tv_sec) * 8) - 1));
 183         tm_max.tv_nsec = (-1) & ~((long)1 << ((sizeof(tm_max.tv_nsec) * 8) - 1));
 184
 185         /* set log level */
 186         if (dflag > 1)
 187                 log_upto = LOG_DEBUG;
 188         else if (dflag > 0)
 189                 log_upto = LOG_INFO;
 190         else
 191                 log_upto = LOG_NOTICE;
 192
 193         if (otherconf_script != NULL && *otherconf_script != '/')
 194                 errx(1, "configuration script (%s) must be an absolute path",
 195                     otherconf_script);
 196         if (*resolvconf_script != '/')
 197                 errx(1, "configuration script (%s) must be an absolute path",
 198                     resolvconf_script);
 199
 200         if (!fflag) {
 201                 pfh = pidfile_open(pidfilepath, 0644, NULL);
 202                 if (pfh == NULL)
 203                         errx(1, "failed to open pidfile: %s", strerror(errno));
 204                 if (daemon(0, 0) != 0)
 205                         errx(1, "failed to daemonize");
 206         }
 207
 208         if ((error = init_capabilities()) != 0)
 209                 err(1, "failed to initialize capabilities");
 210
 211         if (!fflag) {
 212                 cap_openlog(capsyslog, progname, LOG_NDELAY | LOG_PID,
 213                     LOG_DAEMON);
 214                 if (log_upto >= 0)
 215                         (void)cap_setlogmask(capsyslog, LOG_UPTO(log_upto));
 216                 (void)signal(SIGTERM, set_exit);
 217                 (void)signal(SIGINT, set_exit);
 218                 (void)signal(SIGUSR1, set_dumpfile);
 219                 dumpfp = rtsold_init_dumpfile(RTSOL_DUMPFILE);
 220         } else
 221                 dumpfp = NULL;
 222
 223         kq = kqueue();
 224         if (kq < 0) {
 225                 warnmsg(LOG_ERR, __func__, "failed to create a kqueue: %s",
 226                     strerror(errno));
 227                 exit(1);
 228         }
 229
 230         /* Open global sockets and register for read events. */
 231         if ((rtsock = rtsock_open()) < 0) {
 232                 warnmsg(LOG_ERR, __func__, "failed to open routing socket");
 233                 exit(1);
 234         }
 235         if ((rcvsock = recvsockopen()) < 0) {
 236                 warnmsg(LOG_ERR, __func__, "failed to open receive socket");
 237                 exit(1);
 238         }
 239         EV_SET(&events[0], rtsock, EVFILT_READ, EV_ADD, 0, 0, NULL);
 240         EV_SET(&events[1], rcvsock, EVFILT_READ, EV_ADD, 0, 0, NULL);
 241         if (kevent(kq, events, 2, NULL, 0, NULL) < 0) {
 242                 warnmsg(LOG_ERR, __func__, "kevent(): %s", strerror(errno));
 243                 exit(1);
 244         }
 245
 246         /* Probe network interfaces and set up tracking info. */
 247         if (ifinit() != 0) {
 248                 warnmsg(LOG_ERR, __func__, "failed to initialize interfaces");
 249                 exit(1);
 250         }
 251         if (aflag)
 252                 argv = autoifprobe();
 253         while (argv && *argv) {
 254                 if (ifconfig(*argv)) {
 255                         warnmsg(LOG_ERR, __func__,
 256                             "failed to initialize %s", *argv);
 257                         exit(1);
 258                 }
 259                 argv++;
 260         }
 261
 262         /* Write to our pidfile. */
 263         if (pfh != NULL && pidfile_write(pfh) != 0) {
 264                 warnmsg(LOG_ERR, __func__,
 265                     "failed to open pidfile: %s", strerror(errno));
 266                 exit(1);
 267         }
 268
 269         /* Enter capability mode. */
 270         caph_cache_catpages();
 271         if (caph_enter_casper() != 0) {
 272                 warnmsg(LOG_ERR, __func__, "caph_enter(): %s", strerror(errno));
 273                 exit(1);
 274         }
 275
 276         for (;;) {
 277                 if (do_exit) {
 278                         /* Handle SIGTERM, SIGINT. */
 279                         if (pfh != NULL)
 280                                 pidfile_remove(pfh);
 281                         break;
 282                 }
 283                 if (do_dump) {
 284                         /* Handle SIGUSR1. */
 285                         do_dump = 0;
 286                         if (dumpfp != NULL)
 287                                 rtsold_dump(dumpfp);
 288                 }
 289
 290                 timeout = rtsol_check_timer();
 291
 292                 if (once) {
 293                         /* if we have no timeout, we are done (or failed) */
 294                         if (timeout == NULL)
 295                                 break;
 296
 297                         /* if all interfaces have got RA packet, we are done */
 298                         TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
 299                                 if (ifi->state != IFS_DOWN && ifi->racnt == 0)
 300                                         break;
 301                         }
 302                         if (ifi == NULL)
 303                                 break;
 304                 }
 305
 306                 error = kevent(kq, NULL, 0, &events[0], 1, timeout);
 307                 if (error < 1) {
 308                         if (error < 0 && errno != EINTR)
 309                                 warnmsg(LOG_ERR, __func__, "kevent(): %s",
 310                                     strerror(errno));
 311                         continue;
 312                 }
 313
 314                 if (events[0].ident == (uintptr_t)rtsock)
 315                         rtsock_input(rtsock);
 316                 else
 317                         rtsol_input(rcvsock);
 318         }
 319
 320         return (0);
 321 }
 322
 323 static int
 324 init_capabilities(void)
 325 {
 326 #ifdef WITH_CASPER
 327         const char *const scripts[2] = { resolvconf_script, otherconf_script };
 328         cap_channel_t *capcasper;
 329         nvlist_t *limits;
 330
 331         capcasper = cap_init();
 332         if (capcasper == NULL)
 333                 return (-1);
 334
 335         capllflags = cap_service_open(capcasper, "rtsold.llflags");
 336         if (capllflags == NULL)
 337                 return (-1);
 338
 339         capscript = cap_service_open(capcasper, "rtsold.script");
 340         if (capscript == NULL)
 341                 return (-1);
 342         limits = nvlist_create(0);
 343         nvlist_add_string_array(limits, "scripts", scripts,
 344             otherconf_script != NULL ? 2 : 1);
 345         if (cap_limit_set(capscript, limits) != 0)
 346                 return (-1);
 347
 348         capsendmsg = cap_service_open(capcasper, "rtsold.sendmsg");
 349         if (capsendmsg == NULL)
 350                 return (-1);
 351
 352         if (!fflag) {
 353                 capsyslog = cap_service_open(capcasper, "system.syslog");
 354                 if (capsyslog == NULL)
 355                         return (-1);
 356         }
 357
 358         cap_close(capcasper);
 359 #endif /* WITH_CASPER */
 360         return (0);
 361 }
 362
 363 static int
 364 ifconfig(char *ifname)
 365 {
 366         struct ifinfo *ifi;
 367         struct sockaddr_dl *sdl;
 368         int flags;
 369
 370         ifi = NULL;
 371         if ((sdl = if_nametosdl(ifname)) == NULL) {
 372                 warnmsg(LOG_ERR, __func__,
 373                     "failed to get link layer information for %s", ifname);
 374                 goto bad;
 375         }
 376         if (find_ifinfo(sdl->sdl_index)) {
 377                 warnmsg(LOG_ERR, __func__,
 378                     "interface %s was already configured", ifname);
 379                 goto bad;
 380         }
 381
 382         if (Fflag) {
 383                 struct in6_ndireq nd;
 384                 int s;
 385
 386                 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 387                         warnmsg(LOG_ERR, __func__, "socket() failed.");
 388                         goto bad;
 389                 }
 390                 memset(&nd, 0, sizeof(nd));
 391                 strlcpy(nd.ifname, ifname, sizeof(nd.ifname));
 392                 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
 393                         warnmsg(LOG_ERR, __func__,
 394                             "cannot get accept_rtadv flag");
 395                         (void)close(s);
 396                         goto bad;
 397                 }
 398                 nd.ndi.flags |= ND6_IFF_ACCEPT_RTADV;
 399                 if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd) < 0) {
 400                         warnmsg(LOG_ERR, __func__,
 401                             "cannot set accept_rtadv flag");
 402                         (void)close(s);
 403                         goto bad;
 404                 }
 405                 (void)close(s);
 406         }
 407
 408         if ((ifi = malloc(sizeof(*ifi))) == NULL) {
 409                 warnmsg(LOG_ERR, __func__, "memory allocation failed");
 410                 goto bad;
 411         }
 412         memset(ifi, 0, sizeof(*ifi));
 413         ifi->sdl = sdl;
 414         ifi->ifi_rdnss = IFI_DNSOPT_STATE_NOINFO;
 415         ifi->ifi_dnssl = IFI_DNSOPT_STATE_NOINFO;
 416         TAILQ_INIT(&ifi->ifi_rainfo);
 417         strlcpy(ifi->ifname, ifname, sizeof(ifi->ifname));
 418
 419         /* construct a router solicitation message */
 420         if (make_packet(ifi))
 421                 goto bad;
 422
 423         /* set link ID of this interface. */
 424 #ifdef HAVE_SCOPELIB
 425         if (inet_zoneid(AF_INET6, 2, ifname, &ifi->linkid))
 426                 goto bad;
 427 #else
 428         /* XXX: assume interface IDs as link IDs */
 429         ifi->linkid = ifi->sdl->sdl_index;
 430 #endif
 431
 432         /*
 433          * check if the interface is available.
 434          * also check if SIOCGIFMEDIA ioctl is OK on the interface.
 435          */
 436         ifi->mediareqok = 1;
 437         ifi->active = interface_status(ifi);
 438         if (!ifi->mediareqok) {
 439                 /*
 440                  * probe routers periodically even if the link status
 441                  * does not change.
 442                  */
 443                 ifi->probeinterval = PROBE_INTERVAL;
 444         }
 445
 446         /* activate interface: interface_up returns 0 on success */
 447         flags = interface_up(ifi->ifname);
 448         if (flags == 0)
 449                 ifi->state = IFS_DELAY;
 450         else if (flags == IFS_TENTATIVE)
 451                 ifi->state = IFS_TENTATIVE;
 452         else
 453                 ifi->state = IFS_DOWN;
 454
 455         rtsol_timer_update(ifi);
 456
 457         TAILQ_INSERT_TAIL(&ifinfo_head, ifi, ifi_next);
 458         return (0);
 459
 460 bad:
 461         free(sdl);
 462         free(ifi);
 463         return (-1);
 464 }
 465
 466 struct rainfo *
 467 find_rainfo(struct ifinfo *ifi, struct sockaddr_in6 *sin6)
 468 {
 469         struct rainfo *rai;
 470
 471         TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next)
 472                 if (memcmp(&rai->rai_saddr.sin6_addr, &sin6->sin6_addr,
 473                     sizeof(rai->rai_saddr.sin6_addr)) == 0)
 474                         return (rai);
 475
 476         return (NULL);
 477 }
 478
 479 struct ifinfo *
 480 find_ifinfo(int ifindex)
 481 {
 482         struct ifinfo *ifi;
 483
 484         TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
 485                 if (ifi->sdl->sdl_index == ifindex)
 486                         return (ifi);
 487         }
 488         return (NULL);
 489 }
 490
 491 static int
 492 make_packet(struct ifinfo *ifi)
 493 {
 494         size_t packlen = sizeof(struct nd_router_solicit), lladdroptlen = 0;
 495         struct nd_router_solicit *rs;
 496         char *buf;
 497
 498         if ((lladdroptlen = lladdropt_length(ifi->sdl)) == 0) {
 499                 warnmsg(LOG_INFO, __func__,
 500                     "link-layer address option has null length"
 501                     " on %s. Treat as not included.", ifi->ifname);
 502         }
 503         packlen += lladdroptlen;
 504         ifi->rs_datalen = packlen;
 505
 506         /* allocate buffer */
 507         if ((buf = malloc(packlen)) == NULL) {
 508                 warnmsg(LOG_ERR, __func__,
 509                     "memory allocation failed for %s", ifi->ifname);
 510                 return (-1);
 511         }
 512         ifi->rs_data = buf;
 513
 514         /* fill in the message */
 515         rs = (struct nd_router_solicit *)buf;
 516         rs->nd_rs_type = ND_ROUTER_SOLICIT;
 517         rs->nd_rs_code = 0;
 518         rs->nd_rs_cksum = 0;
 519         rs->nd_rs_reserved = 0;
 520         buf += sizeof(*rs);
 521
 522         /* fill in source link-layer address option */
 523         if (lladdroptlen)
 524                 lladdropt_fill(ifi->sdl, (struct nd_opt_hdr *)buf);
 525
 526         return (0);
 527 }
 528
 529 static struct timespec *
 530 rtsol_check_timer(void)
 531 {
 532         static struct timespec returnval;
 533         struct timespec now, rtsol_timer;
 534         struct ifinfo *ifi;
 535         struct rainfo *rai;
 536         struct ra_opt *rao, *raotmp;
 537         int error, flags;
 538
 539         clock_gettime(CLOCK_MONOTONIC_FAST, &now);
 540
 541         rtsol_timer = tm_max;
 542
 543         TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
 544                 if (TS_CMP(&ifi->expire, &now, <=)) {
 545                         warnmsg(LOG_DEBUG, __func__, "timer expiration on %s, "
 546                             "state = %d", ifi->ifname, ifi->state);
 547
 548                         while((rai = TAILQ_FIRST(&ifi->ifi_rainfo)) != NULL) {
 549                                 /* Remove all RA options. */
 550                                 TAILQ_REMOVE(&ifi->ifi_rainfo, rai, rai_next);
 551                                 while ((rao = TAILQ_FIRST(&rai->rai_ra_opt)) !=
 552                                     NULL) {
 553                                         TAILQ_REMOVE(&rai->rai_ra_opt, rao,
 554                                             rao_next);
 555                                         if (rao->rao_msg != NULL)
 556                                                 free(rao->rao_msg);
 557                                         free(rao);
 558                                 }
 559                                 free(rai);
 560                         }
 561                         switch (ifi->state) {
 562                         case IFS_DOWN:
 563                         case IFS_TENTATIVE:
 564                                 /* interface_up returns 0 on success */
 565                                 flags = interface_up(ifi->ifname);
 566                                 if (flags == 0)
 567                                         ifi->state = IFS_DELAY;
 568                                 else if (flags == IFS_TENTATIVE)
 569                                         ifi->state = IFS_TENTATIVE;
 570                                 else
 571                                         ifi->state = IFS_DOWN;
 572                                 break;
 573                         case IFS_IDLE:
 574                         {
 575                                 int oldstatus = ifi->active;
 576                                 int probe = 0;
 577
 578                                 ifi->active = interface_status(ifi);
 579
 580                                 if (oldstatus != ifi->active) {
 581                                         warnmsg(LOG_DEBUG, __func__,
 582                                             "%s status is changed"
 583                                             " from %d to %d",
 584                                             ifi->ifname,
 585                                             oldstatus, ifi->active);
 586                                         probe = 1;
 587                                         ifi->state = IFS_DELAY;
 588                                 } else if (ifi->probeinterval &&
 589                                     (ifi->probetimer -=
 590                                     ifi->timer.tv_sec) <= 0) {
 591                                         /* probe timer expired */
 592                                         ifi->probetimer =
 593                                             ifi->probeinterval;
 594                                         probe = 1;
 595                                         ifi->state = IFS_PROBE;
 596                                 }
 597
 598                                 /*
 599                                  * If we need a probe, clear the previous
 600                                  * status wrt the "other" configuration.
 601                                  */
 602                                 if (probe)
 603                                         ifi->otherconfig = 0;
 604                                 if (probe && mobile_node) {
 605                                         error = cap_probe_defrouters(capsendmsg,
 606                                             ifi);
 607                                         if (error != 0)
 608                                                 warnmsg(LOG_DEBUG, __func__,
 609                                             "failed to probe routers: %d",
 610                                                     error);
 611                                 }
 612                                 break;
 613                         }
 614                         case IFS_DELAY:
 615                                 ifi->state = IFS_PROBE;
 616                                 (void)cap_rssend(capsendmsg, ifi);
 617                                 break;
 618                         case IFS_PROBE:
 619                                 if (ifi->probes < MAX_RTR_SOLICITATIONS)
 620                                         (void)cap_rssend(capsendmsg, ifi);
 621                                 else {
 622                                         warnmsg(LOG_INFO, __func__,
 623                                             "No answer after sending %d RSs",
 624                                             ifi->probes);
 625                                         ifi->probes = 0;
 626                                         ifi->state = IFS_IDLE;
 627                                 }
 628                                 break;
 629                         }
 630                         rtsol_timer_update(ifi);
 631                 } else {
 632                         /* Expiration check for RA options. */
 633                         int expire = 0;
 634
 635                         TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next) {
 636                                 TAILQ_FOREACH_SAFE(rao, &rai->rai_ra_opt,
 637                                     rao_next, raotmp) {
 638                                         warnmsg(LOG_DEBUG, __func__,
 639                                             "RA expiration timer: "
 640                                             "type=%d, msg=%s, expire=%s",
 641                                             rao->rao_type, (char *)rao->rao_msg,
 642                                                 sec2str(&rao->rao_expire));
 643                                         if (TS_CMP(&now, &rao->rao_expire,
 644                                             >=)) {
 645                                                 warnmsg(LOG_DEBUG, __func__,
 646                                                     "RA expiration timer: "
 647                                                     "expired.");
 648                                                 TAILQ_REMOVE(&rai->rai_ra_opt,
 649                                                     rao, rao_next);
 650                                                 if (rao->rao_msg != NULL)
 651                                                         free(rao->rao_msg);
 652                                                 free(rao);
 653                                                 expire = 1;
 654                                         }
 655                                 }
 656                         }
 657                         if (expire)
 658                                 ra_opt_handler(ifi);
 659                 }
 660                 if (TS_CMP(&ifi->expire, &rtsol_timer, <))
 661                         rtsol_timer = ifi->expire;
 662         }
 663
 664         if (TS_CMP(&rtsol_timer, &tm_max, ==)) {
 665                 warnmsg(LOG_DEBUG, __func__, "there is no timer");
 666                 return (NULL);
 667         } else if (TS_CMP(&rtsol_timer, &now, <))
 668                 /* this may occur when the interval is too small */
 669                 returnval.tv_sec = returnval.tv_nsec = 0;
 670         else
 671                 TS_SUB(&rtsol_timer, &now, &returnval);
 672
 673         now.tv_sec += returnval.tv_sec;
 674         now.tv_nsec += returnval.tv_nsec;
 675         warnmsg(LOG_DEBUG, __func__, "New timer is %s",
 676             sec2str(&now));
 677
 678         return (&returnval);
 679 }
 680
 681 void
 682 rtsol_timer_update(struct ifinfo *ifi)
 683 {
 684 #define MILLION 1000000
 685 #define DADRETRY 10             /* XXX: adhoc */
 686         long interval;
 687         struct timespec now;
 688
 689         bzero(&ifi->timer, sizeof(ifi->timer));
 690
 691         switch (ifi->state) {
 692         case IFS_DOWN:
 693         case IFS_TENTATIVE:
 694                 if (++ifi->dadcount > DADRETRY) {
 695                         ifi->dadcount = 0;
 696                         ifi->timer.tv_sec = PROBE_INTERVAL;
 697                 } else
 698                         ifi->timer.tv_sec = 1;
 699                 break;
 700         case IFS_IDLE:
 701                 if (mobile_node)
 702                         /* XXX should be configurable */
 703                         ifi->timer.tv_sec = 3;
 704                 else
 705                         ifi->timer = tm_max;    /* stop timer(valid?) */
 706                 break;
 707         case IFS_DELAY:
 708                 interval = arc4random_uniform(MAX_RTR_SOLICITATION_DELAY * MILLION);
 709                 ifi->timer.tv_sec = interval / MILLION;
 710                 ifi->timer.tv_nsec = (interval % MILLION) * 1000;
 711                 break;
 712         case IFS_PROBE:
 713                 if (ifi->probes < MAX_RTR_SOLICITATIONS)
 714                         ifi->timer.tv_sec = RTR_SOLICITATION_INTERVAL;
 715                 else
 716                         /*
 717                          * After sending MAX_RTR_SOLICITATIONS solicitations,
 718                          * we're just waiting for possible replies; there
 719                          * will be no more solicitation.  Thus, we change
 720                          * the timer value to MAX_RTR_SOLICITATION_DELAY based
 721                          * on RFC 2461, Section 6.3.7.
 722                          */
 723                         ifi->timer.tv_sec = MAX_RTR_SOLICITATION_DELAY;
 724                 break;
 725         default:
 726                 warnmsg(LOG_ERR, __func__,
 727                     "illegal interface state(%d) on %s",
 728                     ifi->state, ifi->ifname);
 729                 return;
 730         }
 731
 732         /* reset the timer */
 733         if (TS_CMP(&ifi->timer, &tm_max, ==)) {
 734                 ifi->expire = tm_max;
 735                 warnmsg(LOG_DEBUG, __func__,
 736                     "stop timer for %s", ifi->ifname);
 737         } else {
 738                 clock_gettime(CLOCK_MONOTONIC_FAST, &now);
 739                 TS_ADD(&now, &ifi->timer, &ifi->expire);
 740
 741                 now.tv_sec += ifi->timer.tv_sec;
 742                 now.tv_nsec += ifi->timer.tv_nsec;
 743                 warnmsg(LOG_DEBUG, __func__, "set timer for %s to %s",
 744                     ifi->ifname, sec2str(&now));
 745         }
 746
 747 #undef MILLION
 748 }
 749
 750 static void
 751 set_dumpfile(int sig __unused)
 752 {
 753
 754         do_dump = 1;
 755 }
 756
 757 static void
 758 set_exit(int sig __unused)
 759 {
 760
 761         do_exit = 1;
 762 }
 763
 764 static void
 765 usage(const char *progname)
 766 {
 767
 768         if (strcmp(progname, "rtsold") == 0) {
 769                 fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] "
 770                     "[-p pidfile] [-R script-name] interface ...\n");
 771                 fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] "
 772                     "[-p pidfile] [-R script-name] -a\n");
 773         } else {
 774                 fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
 775                     "[-p pidfile] [-R script-name] interface ...\n");
 776                 fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
 777                     "[-p pidfile] [-R script-name] -a\n");
 778         }
 779         exit(1);
 780 }
 781
 782 void
 783 warnmsg(int priority, const char *func, const char *msg, ...)
 784 {
 785         va_list ap;
 786         char buf[BUFSIZ];
 787
 788         va_start(ap, msg);
 789         if (fflag) {
 790                 if (priority <= log_upto)
 791                         vwarnx(msg, ap);
 792         } else {
 793                 snprintf(buf, sizeof(buf), "<%s> %s", func, msg);
 794                 msg = buf;
 795                 cap_vsyslog(capsyslog, priority, msg, ap);
 796         }
 797         va_end(ap);
 798 }
 799
 800 /*
 801  * return a list of interfaces which is suitable to sending an RS.
 802  */
 803 static char **
 804 autoifprobe(void)
 805 {
 806         static char **argv = NULL;
 807         static int n = 0;
 808         char **a;
 809         int s = 0, i, found;
 810         struct ifaddrs *ifap, *ifa;
 811         struct in6_ndireq nd;
 812
 813         /* initialize */
 814         while (n--)
 815                 free(argv[n]);
 816         if (argv) {
 817                 free(argv);
 818                 argv = NULL;
 819         }
 820         n = 0;
 821
 822         if (getifaddrs(&ifap) != 0)
 823                 return (NULL);
 824
 825         if (!Fflag && (s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 826                 warnmsg(LOG_ERR, __func__, "socket");
 827                 exit(1);
 828         }
 829
 830         /* find an ethernet */
 831         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 832                 if ((ifa->ifa_flags & IFF_UP) == 0)
 833                         continue;
 834                 if ((ifa->ifa_flags & IFF_POINTOPOINT) != 0)
 835                         continue;
 836                 if ((ifa->ifa_flags & IFF_LOOPBACK) != 0)
 837                         continue;
 838                 if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
 839                         continue;
 840
 841                 if (ifa->ifa_addr->sa_family != AF_INET6)
 842                         continue;
 843
 844                 found = 0;
 845                 for (i = 0; i < n; i++) {
 846                         if (strcmp(argv[i], ifa->ifa_name) == 0) {
 847                                 found++;
 848                                 break;
 849                         }
 850                 }
 851                 if (found)
 852                         continue;
 853
 854                 /*
 855                  * Skip the interfaces which IPv6 and/or accepting RA
 856                  * is disabled.
 857                  */
 858                 if (!Fflag) {
 859                         memset(&nd, 0, sizeof(nd));
 860                         strlcpy(nd.ifname, ifa->ifa_name, sizeof(nd.ifname));
 861                         if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
 862                                 warnmsg(LOG_ERR, __func__,
 863                                         "ioctl(SIOCGIFINFO_IN6)");
 864                                 exit(1);
 865                         }
 866                         if ((nd.ndi.flags & ND6_IFF_IFDISABLED))
 867                                 continue;
 868                         if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV))
 869                                 continue;
 870                 }
 871
 872                 /* if we find multiple candidates, just warn. */
 873                 if (n != 0 && dflag > 1)
 874                         warnmsg(LOG_WARNING, __func__,
 875                                 "multiple interfaces found");
 876
 877                 a = realloc(argv, (n + 1) * sizeof(char *));
 878                 if (a == NULL) {
 879                         warnmsg(LOG_ERR, __func__, "realloc");
 880                         exit(1);
 881                 }
 882                 argv = a;
 883                 argv[n] = strdup(ifa->ifa_name);
 884                 if (!argv[n]) {
 885                         warnmsg(LOG_ERR, __func__, "malloc");
 886                         exit(1);
 887                 }
 888                 n++;
 889         }
 890
 891         if (n) {
 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] = NULL;
 899
 900                 if (dflag > 0) {
 901                         for (i = 0; i < n; i++)
 902                                 warnmsg(LOG_WARNING, __func__, "probing %s",
 903                                         argv[i]);
 904                 }
 905         }
 906         if (!Fflag)
 907                 close(s);
 908         freeifaddrs(ifap);
 909         return (argv);
 910 }