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
  34 #include <sys/param.h>
  35 #include <sys/capsicum.h>
  36 #include <sys/event.h>
  37 #include <sys/ioctl.h>
  38 #include <sys/socket.h>
  39
  40 #include <net/if.h>
  41 #include <net/if_dl.h>
  42
  43 #include <netinet/in.h>
  44 #include <netinet/icmp6.h>
  45 #include <netinet/in_var.h>
  46 #include <arpa/inet.h>
  47
  48 #include <netinet6/nd6.h>
  49
  50 #include <capsicum_helpers.h>
  51 #include <err.h>
  52 #include <errno.h>
  53 #include <ifaddrs.h>
  54 #include <libgen.h>
  55 #include <signal.h>
  56 #include <stdarg.h>
  57 #include <stdio.h>
  58 #include <stdlib.h>
  59 #include <string.h>
  60 #include <syslog.h>
  61 #include <time.h>
  62 #include <unistd.h>
  63
  64 #include <libcasper.h>
  65 #include <casper/cap_syslog.h>
  66 #include <libutil.h>
  67
  68 #include "rtsold.h"
  69
  70 #define RTSOL_DUMPFILE  "/var/run/rtsold.dump"
  71
  72 struct timespec tm_max;
  73 static int log_upto = 999;
  74 static int fflag = 0;
  75
  76 int Fflag = 0;  /* force setting sysctl parameters */
  77 int aflag = 0;
  78 int dflag = 0;
  79 int uflag = 0;
  80
  81 const char *managedconf_script;
  82 const char *otherconf_script;
  83 const char *alwaysconf_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 static int no_solicitation_delay = 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 = "adDfFim1M:O:A:p:R:u";
 129                 once = 0;
 130                 pidfilepath = NULL;
 131         } else {
 132                 opts = "adDFiM:O:A: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 'i':
 155                         no_solicitation_delay = 1;
 156                         break;
 157                 case 'm':
 158                         mobile_node = 1;
 159                         break;
 160                 case '1':
 161                         once = 1;
 162                         break;
 163                 case 'M':
 164                         managedconf_script = optarg;
 165                         break;
 166                 case 'O':
 167                         otherconf_script = optarg;
 168                         break;
 169                 case 'A':
 170                         alwaysconf_script = optarg;
 171                         break;
 172                 case 'p':
 173                         pidfilepath = optarg;
 174                         break;
 175                 case 'R':
 176                         resolvconf_script = optarg;
 177                         break;
 178                 case 'u':
 179                         uflag = 1;
 180                         break;
 181                 default:
 182                         usage(progname);
 183                 }
 184         }
 185         argc -= optind;
 186         argv += optind;
 187
 188         if ((!aflag && argc == 0) || (aflag && argc != 0))
 189                 usage(progname);
 190
 191         /* Generate maximum time in timespec. */
 192         tm_max.tv_sec = (-1) & ~((time_t)1 << ((sizeof(tm_max.tv_sec) * 8) - 1));
 193         tm_max.tv_nsec = (-1) & ~((long)1 << ((sizeof(tm_max.tv_nsec) * 8) - 1));
 194
 195         /* set log level */
 196         if (dflag > 1)
 197                 log_upto = LOG_DEBUG;
 198         else if (dflag > 0)
 199                 log_upto = LOG_INFO;
 200         else
 201                 log_upto = LOG_NOTICE;
 202
 203         if (managedconf_script != NULL && *managedconf_script != '/')
 204                 errx(1, "configuration script (%s) must be an absolute path",
 205                     managedconf_script);
 206         if (otherconf_script != NULL && *otherconf_script != '/')
 207                 errx(1, "configuration script (%s) must be an absolute path",
 208                     otherconf_script);
 209         if (alwaysconf_script != NULL && *alwaysconf_script != '/')
 210                 errx(1, "configuration script (%s) must be an absolute path",
 211                     alwaysconf_script);
 212         if (*resolvconf_script != '/')
 213                 errx(1, "configuration script (%s) must be an absolute path",
 214                     resolvconf_script);
 215
 216         if (!fflag) {
 217                 pfh = pidfile_open(pidfilepath, 0644, NULL);
 218                 if (pfh == NULL)
 219                         errx(1, "failed to open pidfile: %s", strerror(errno));
 220                 if (daemon(0, 0) != 0)
 221                         errx(1, "failed to daemonize");
 222         }
 223
 224         if ((error = init_capabilities()) != 0)
 225                 err(1, "failed to initialize capabilities");
 226
 227         if (!fflag) {
 228                 cap_openlog(capsyslog, progname, LOG_NDELAY | LOG_PID,
 229                     LOG_DAEMON);
 230                 if (log_upto >= 0)
 231                         (void)cap_setlogmask(capsyslog, LOG_UPTO(log_upto));
 232                 (void)signal(SIGTERM, set_exit);
 233                 (void)signal(SIGINT, set_exit);
 234                 (void)signal(SIGUSR1, set_dumpfile);
 235                 dumpfp = rtsold_init_dumpfile(RTSOL_DUMPFILE);
 236         } else
 237                 dumpfp = NULL;
 238
 239         kq = kqueue();
 240         if (kq < 0) {
 241                 warnmsg(LOG_ERR, __func__, "failed to create a kqueue: %s",
 242                     strerror(errno));
 243                 exit(1);
 244         }
 245
 246         /* Open global sockets and register for read events. */
 247         if ((rtsock = rtsock_open()) < 0) {
 248                 warnmsg(LOG_ERR, __func__, "failed to open routing socket");
 249                 exit(1);
 250         }
 251         if ((rcvsock = recvsockopen()) < 0) {
 252                 warnmsg(LOG_ERR, __func__, "failed to open receive socket");
 253                 exit(1);
 254         }
 255         EV_SET(&events[0], rtsock, EVFILT_READ, EV_ADD, 0, 0, NULL);
 256         EV_SET(&events[1], rcvsock, EVFILT_READ, EV_ADD, 0, 0, NULL);
 257         if (kevent(kq, events, 2, NULL, 0, NULL) < 0) {
 258                 warnmsg(LOG_ERR, __func__, "kevent(): %s", strerror(errno));
 259                 exit(1);
 260         }
 261
 262         /* Probe network interfaces and set up tracking info. */
 263         if (ifinit() != 0) {
 264                 warnmsg(LOG_ERR, __func__, "failed to initialize interfaces");
 265                 exit(1);
 266         }
 267         if (aflag)
 268                 argv = autoifprobe();
 269         while (argv && *argv) {
 270                 if (ifconfig(*argv)) {
 271                         warnmsg(LOG_ERR, __func__,
 272                             "failed to initialize %s", *argv);
 273                         exit(1);
 274                 }
 275                 argv++;
 276         }
 277
 278         /* Write to our pidfile. */
 279         if (pfh != NULL && pidfile_write(pfh) != 0) {
 280                 warnmsg(LOG_ERR, __func__,
 281                     "failed to open pidfile: %s", strerror(errno));
 282                 exit(1);
 283         }
 284
 285         /* Enter capability mode. */
 286         caph_cache_catpages();
 287         if (caph_enter_casper() != 0) {
 288                 warnmsg(LOG_ERR, __func__, "caph_enter(): %s", strerror(errno));
 289                 exit(1);
 290         }
 291
 292         for (;;) {
 293                 if (do_exit) {
 294                         /* Handle SIGTERM, SIGINT. */
 295                         if (pfh != NULL)
 296                                 pidfile_remove(pfh);
 297                         break;
 298                 }
 299                 if (do_dump) {
 300                         /* Handle SIGUSR1. */
 301                         do_dump = 0;
 302                         if (dumpfp != NULL)
 303                                 rtsold_dump(dumpfp);
 304                 }
 305
 306                 timeout = rtsol_check_timer();
 307
 308                 if (once) {
 309                         /* if we have no timeout, we are done (or failed) */
 310                         if (timeout == NULL)
 311                                 break;
 312
 313                         /* if all interfaces have got RA packet, we are done */
 314                         TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
 315                                 if (ifi->state != IFS_DOWN && ifi->racnt == 0)
 316                                         break;
 317                         }
 318                         if (ifi == NULL)
 319                                 break;
 320                 }
 321
 322                 error = kevent(kq, NULL, 0, &events[0], 1, timeout);
 323                 if (error < 1) {
 324                         if (error < 0 && errno != EINTR)
 325                                 warnmsg(LOG_ERR, __func__, "kevent(): %s",
 326                                     strerror(errno));
 327                         continue;
 328                 }
 329
 330                 if (events[0].ident == (uintptr_t)rtsock)
 331                         rtsock_input(rtsock);
 332                 else
 333                         rtsol_input(rcvsock);
 334         }
 335
 336         return (0);
 337 }
 338
 339 static int
 340 init_capabilities(void)
 341 {
 342 #ifdef WITH_CASPER
 343         const char *const scripts[] =
 344             { resolvconf_script, managedconf_script, otherconf_script,
 345             alwaysconf_script };
 346         cap_channel_t *capcasper;
 347         nvlist_t *limits;
 348
 349         capcasper = cap_init();
 350         if (capcasper == NULL)
 351                 return (-1);
 352
 353         capllflags = cap_service_open(capcasper, "rtsold.llflags");
 354         if (capllflags == NULL)
 355                 return (-1);
 356
 357         capscript = cap_service_open(capcasper, "rtsold.script");
 358         if (capscript == NULL)
 359                 return (-1);
 360         limits = nvlist_create(0);
 361         for (size_t i = 0; i < nitems(scripts); i++)
 362                 if (scripts[i] != NULL)
 363                         nvlist_append_string_array(limits, "scripts",
 364                             scripts[i]);
 365         if (cap_limit_set(capscript, limits) != 0)
 366                 return (-1);
 367
 368         capsendmsg = cap_service_open(capcasper, "rtsold.sendmsg");
 369         if (capsendmsg == NULL)
 370                 return (-1);
 371
 372         if (!fflag) {
 373                 capsyslog = cap_service_open(capcasper, "system.syslog");
 374                 if (capsyslog == NULL)
 375                         return (-1);
 376         }
 377
 378         cap_close(capcasper);
 379 #endif /* WITH_CASPER */
 380         return (0);
 381 }
 382
 383 static int
 384 ifconfig(char *ifname)
 385 {
 386         struct ifinfo *ifi;
 387         struct sockaddr_dl *sdl;
 388         int flags;
 389
 390         ifi = NULL;
 391         if ((sdl = if_nametosdl(ifname)) == NULL) {
 392                 warnmsg(LOG_ERR, __func__,
 393                     "failed to get link layer information for %s", ifname);
 394                 goto bad;
 395         }
 396         if (find_ifinfo(sdl->sdl_index)) {
 397                 warnmsg(LOG_ERR, __func__,
 398                     "interface %s was already configured", ifname);
 399                 goto bad;
 400         }
 401
 402         if (Fflag) {
 403                 struct in6_ndireq nd;
 404                 int s;
 405
 406                 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 407                         warnmsg(LOG_ERR, __func__, "socket() failed.");
 408                         goto bad;
 409                 }
 410                 memset(&nd, 0, sizeof(nd));
 411                 strlcpy(nd.ifname, ifname, sizeof(nd.ifname));
 412                 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
 413                         warnmsg(LOG_ERR, __func__,
 414                             "cannot get accept_rtadv flag");
 415                         (void)close(s);
 416                         goto bad;
 417                 }
 418                 nd.ndi.flags |= ND6_IFF_ACCEPT_RTADV;
 419                 if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd) < 0) {
 420                         warnmsg(LOG_ERR, __func__,
 421                             "cannot set accept_rtadv flag");
 422                         (void)close(s);
 423                         goto bad;
 424                 }
 425                 (void)close(s);
 426         }
 427
 428         if ((ifi = malloc(sizeof(*ifi))) == NULL) {
 429                 warnmsg(LOG_ERR, __func__, "memory allocation failed");
 430                 goto bad;
 431         }
 432         memset(ifi, 0, sizeof(*ifi));
 433         ifi->sdl = sdl;
 434         ifi->ifi_rdnss = IFI_DNSOPT_STATE_NOINFO;
 435         ifi->ifi_dnssl = IFI_DNSOPT_STATE_NOINFO;
 436         TAILQ_INIT(&ifi->ifi_rainfo);
 437         strlcpy(ifi->ifname, ifname, sizeof(ifi->ifname));
 438
 439         /* construct a router solicitation message */
 440         if (make_packet(ifi))
 441                 goto bad;
 442
 443         /* set link ID of this interface. */
 444 #ifdef HAVE_SCOPELIB
 445         if (inet_zoneid(AF_INET6, 2, ifname, &ifi->linkid))
 446                 goto bad;
 447 #else
 448         /* XXX: assume interface IDs as link IDs */
 449         ifi->linkid = ifi->sdl->sdl_index;
 450 #endif
 451
 452         /*
 453          * check if the interface is available.
 454          * also check if SIOCGIFMEDIA ioctl is OK on the interface.
 455          */
 456         ifi->mediareqok = 1;
 457         ifi->active = interface_status(ifi);
 458         if (!ifi->mediareqok) {
 459                 /*
 460                  * probe routers periodically even if the link status
 461                  * does not change.
 462                  */
 463                 ifi->probeinterval = PROBE_INTERVAL;
 464         }
 465
 466         /* activate interface: interface_up returns 0 on success */
 467         flags = interface_up(ifi->ifname);
 468         if (flags == 0)
 469                 ifi->state = IFS_DELAY;
 470         else if (flags == IFS_TENTATIVE)
 471                 ifi->state = IFS_TENTATIVE;
 472         else
 473                 ifi->state = IFS_DOWN;
 474
 475         rtsol_timer_update(ifi);
 476
 477         TAILQ_INSERT_TAIL(&ifinfo_head, ifi, ifi_next);
 478         return (0);
 479
 480 bad:
 481         free(sdl);
 482         free(ifi);
 483         return (-1);
 484 }
 485
 486 struct rainfo *
 487 find_rainfo(struct ifinfo *ifi, struct sockaddr_in6 *sin6)
 488 {
 489         struct rainfo *rai;
 490
 491         TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next)
 492                 if (memcmp(&rai->rai_saddr.sin6_addr, &sin6->sin6_addr,
 493                     sizeof(rai->rai_saddr.sin6_addr)) == 0)
 494                         return (rai);
 495
 496         return (NULL);
 497 }
 498
 499 struct ifinfo *
 500 find_ifinfo(int ifindex)
 501 {
 502         struct ifinfo *ifi;
 503
 504         TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
 505                 if (ifi->sdl->sdl_index == ifindex)
 506                         return (ifi);
 507         }
 508         return (NULL);
 509 }
 510
 511 static int
 512 make_packet(struct ifinfo *ifi)
 513 {
 514         size_t packlen = sizeof(struct nd_router_solicit), lladdroptlen = 0;
 515         struct nd_router_solicit *rs;
 516         char *buf;
 517
 518         if ((lladdroptlen = lladdropt_length(ifi->sdl)) == 0) {
 519                 warnmsg(LOG_INFO, __func__,
 520                     "link-layer address option has null length"
 521                     " on %s. Treat as not included.", ifi->ifname);
 522         }
 523         packlen += lladdroptlen;
 524         ifi->rs_datalen = packlen;
 525
 526         /* allocate buffer */
 527         if ((buf = malloc(packlen)) == NULL) {
 528                 warnmsg(LOG_ERR, __func__,
 529                     "memory allocation failed for %s", ifi->ifname);
 530                 return (-1);
 531         }
 532         ifi->rs_data = buf;
 533
 534         /* fill in the message */
 535         rs = (struct nd_router_solicit *)buf;
 536         rs->nd_rs_type = ND_ROUTER_SOLICIT;
 537         rs->nd_rs_code = 0;
 538         rs->nd_rs_cksum = 0;
 539         rs->nd_rs_reserved = 0;
 540         buf += sizeof(*rs);
 541
 542         /* fill in source link-layer address option */
 543         if (lladdroptlen)
 544                 lladdropt_fill(ifi->sdl, (struct nd_opt_hdr *)buf);
 545
 546         return (0);
 547 }
 548
 549 static struct timespec *
 550 rtsol_check_timer(void)
 551 {
 552         static struct timespec returnval;
 553         struct timespec now, rtsol_timer;
 554         struct ifinfo *ifi;
 555         struct rainfo *rai;
 556         struct ra_opt *rao, *raotmp;
 557         int error, flags;
 558
 559         clock_gettime(CLOCK_MONOTONIC_FAST, &now);
 560
 561         rtsol_timer = tm_max;
 562
 563         TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
 564                 if (TS_CMP(&ifi->expire, &now, <=)) {
 565                         warnmsg(LOG_DEBUG, __func__, "timer expiration on %s, "
 566                             "state = %d", ifi->ifname, ifi->state);
 567
 568                         while((rai = TAILQ_FIRST(&ifi->ifi_rainfo)) != NULL) {
 569                                 /* Remove all RA options. */
 570                                 TAILQ_REMOVE(&ifi->ifi_rainfo, rai, rai_next);
 571                                 while ((rao = TAILQ_FIRST(&rai->rai_ra_opt)) !=
 572                                     NULL) {
 573                                         TAILQ_REMOVE(&rai->rai_ra_opt, rao,
 574                                             rao_next);
 575                                         if (rao->rao_msg != NULL)
 576                                                 free(rao->rao_msg);
 577                                         free(rao);
 578                                 }
 579                                 free(rai);
 580                         }
 581                         switch (ifi->state) {
 582                         case IFS_DOWN:
 583                         case IFS_TENTATIVE:
 584                                 /* interface_up returns 0 on success */
 585                                 flags = interface_up(ifi->ifname);
 586                                 if (flags == 0)
 587                                         ifi->state = IFS_DELAY;
 588                                 else if (flags == IFS_TENTATIVE)
 589                                         ifi->state = IFS_TENTATIVE;
 590                                 else
 591                                         ifi->state = IFS_DOWN;
 592                                 break;
 593                         case IFS_IDLE:
 594                         {
 595                                 int oldstatus = ifi->active;
 596                                 int probe = 0;
 597
 598                                 ifi->active = interface_status(ifi);
 599
 600                                 if (oldstatus != ifi->active) {
 601                                         warnmsg(LOG_DEBUG, __func__,
 602                                             "%s status is changed"
 603                                             " from %d to %d",
 604                                             ifi->ifname,
 605                                             oldstatus, ifi->active);
 606                                         probe = 1;
 607                                         ifi->state = IFS_DELAY;
 608                                 } else if (ifi->probeinterval &&
 609                                     (ifi->probetimer -=
 610                                     ifi->timer.tv_sec) <= 0) {
 611                                         /* probe timer expired */
 612                                         ifi->probetimer =
 613                                             ifi->probeinterval;
 614                                         probe = 1;
 615                                         ifi->state = IFS_PROBE;
 616                                 }
 617
 618                                 /*
 619                                  * If we need a probe, clear the previous
 620                                  * status wrt the "managed/other" configuration.
 621                                  */
 622                                 if (probe) {
 623                                         ifi->managedconfig = 0;
 624                                         ifi->otherconfig = 0;
 625                                         ifi->alwaysconfig = 0;
 626                                 }
 627                                 if (probe && mobile_node) {
 628                                         error = cap_probe_defrouters(capsendmsg,
 629                                             ifi);
 630                                         if (error != 0)
 631                                                 warnmsg(LOG_DEBUG, __func__,
 632                                             "failed to probe routers: %d",
 633                                                     error);
 634                                 }
 635                                 break;
 636                         }
 637                         case IFS_DELAY:
 638                                 ifi->state = IFS_PROBE;
 639                                 (void)cap_rssend(capsendmsg, ifi);
 640                                 break;
 641                         case IFS_PROBE:
 642                                 if (ifi->probes < MAX_RTR_SOLICITATIONS)
 643                                         (void)cap_rssend(capsendmsg, ifi);
 644                                 else {
 645                                         warnmsg(LOG_INFO, __func__,
 646                                             "No answer after sending %d RSs",
 647                                             ifi->probes);
 648                                         ifi->probes = 0;
 649                                         ifi->state = IFS_IDLE;
 650                                 }
 651                                 break;
 652                         }
 653                         rtsol_timer_update(ifi);
 654                 } else {
 655                         /* Expiration check for RA options. */
 656                         int expire = 0;
 657
 658                         TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next) {
 659                                 TAILQ_FOREACH_SAFE(rao, &rai->rai_ra_opt,
 660                                     rao_next, raotmp) {
 661                                         warnmsg(LOG_DEBUG, __func__,
 662                                             "RA expiration timer: "
 663                                             "type=%d, msg=%s, expire=%s",
 664                                             rao->rao_type, (char *)rao->rao_msg,
 665                                                 sec2str(&rao->rao_expire));
 666                                         if (TS_CMP(&now, &rao->rao_expire,
 667                                             >=)) {
 668                                                 warnmsg(LOG_DEBUG, __func__,
 669                                                     "RA expiration timer: "
 670                                                     "expired.");
 671                                                 TAILQ_REMOVE(&rai->rai_ra_opt,
 672                                                     rao, rao_next);
 673                                                 if (rao->rao_msg != NULL)
 674                                                         free(rao->rao_msg);
 675                                                 free(rao);
 676                                                 expire = 1;
 677                                         }
 678                                 }
 679                         }
 680                         if (expire)
 681                                 ra_opt_handler(ifi);
 682                 }
 683                 if (TS_CMP(&ifi->expire, &rtsol_timer, <))
 684                         rtsol_timer = ifi->expire;
 685         }
 686
 687         if (TS_CMP(&rtsol_timer, &tm_max, ==)) {
 688                 warnmsg(LOG_DEBUG, __func__, "there is no timer");
 689                 return (NULL);
 690         } else if (TS_CMP(&rtsol_timer, &now, <))
 691                 /* this may occur when the interval is too small */
 692                 returnval.tv_sec = returnval.tv_nsec = 0;
 693         else
 694                 TS_SUB(&rtsol_timer, &now, &returnval);
 695
 696         now.tv_sec += returnval.tv_sec;
 697         now.tv_nsec += returnval.tv_nsec;
 698         warnmsg(LOG_DEBUG, __func__, "New timer is %s",
 699             sec2str(&now));
 700
 701         return (&returnval);
 702 }
 703
 704 void
 705 rtsol_timer_update(struct ifinfo *ifi)
 706 {
 707 #define MILLION 1000000
 708 #define DADRETRY 10             /* XXX: adhoc */
 709         long interval;
 710         struct timespec now;
 711
 712         bzero(&ifi->timer, sizeof(ifi->timer));
 713
 714         switch (ifi->state) {
 715         case IFS_DOWN:
 716         case IFS_TENTATIVE:
 717                 if (++ifi->dadcount > DADRETRY) {
 718                         ifi->dadcount = 0;
 719                         ifi->timer.tv_sec = PROBE_INTERVAL;
 720                 } else
 721                         ifi->timer.tv_sec = 1;
 722                 break;
 723         case IFS_IDLE:
 724                 if (mobile_node)
 725                         /* XXX should be configurable */
 726                         ifi->timer.tv_sec = 3;
 727                 else
 728                         ifi->timer = tm_max;    /* stop timer(valid?) */
 729                 break;
 730         case IFS_DELAY:
 731                 if (no_solicitation_delay)
 732                         interval = 0;
 733                 else
 734                         interval = arc4random_uniform(MAX_RTR_SOLICITATION_DELAY * MILLION);
 735                 ifi->timer.tv_sec = interval / MILLION;
 736                 ifi->timer.tv_nsec = (interval % MILLION) * 1000;
 737                 break;
 738         case IFS_PROBE:
 739                 if (ifi->probes < MAX_RTR_SOLICITATIONS)
 740                         ifi->timer.tv_sec = RTR_SOLICITATION_INTERVAL;
 741                 else
 742                         /*
 743                          * After sending MAX_RTR_SOLICITATIONS solicitations,
 744                          * we're just waiting for possible replies; there
 745                          * will be no more solicitation.  Thus, we change
 746                          * the timer value to MAX_RTR_SOLICITATION_DELAY based
 747                          * on RFC 2461, Section 6.3.7.
 748                          */
 749                         ifi->timer.tv_sec = MAX_RTR_SOLICITATION_DELAY;
 750                 break;
 751         default:
 752                 warnmsg(LOG_ERR, __func__,
 753                     "illegal interface state(%d) on %s",
 754                     ifi->state, ifi->ifname);
 755                 return;
 756         }
 757
 758         /* reset the timer */
 759         if (TS_CMP(&ifi->timer, &tm_max, ==)) {
 760                 ifi->expire = tm_max;
 761                 warnmsg(LOG_DEBUG, __func__,
 762                     "stop timer for %s", ifi->ifname);
 763         } else {
 764                 clock_gettime(CLOCK_MONOTONIC_FAST, &now);
 765                 TS_ADD(&now, &ifi->timer, &ifi->expire);
 766
 767                 now.tv_sec += ifi->timer.tv_sec;
 768                 now.tv_nsec += ifi->timer.tv_nsec;
 769                 warnmsg(LOG_DEBUG, __func__, "set timer for %s to %s",
 770                     ifi->ifname, sec2str(&now));
 771         }
 772
 773 #undef MILLION
 774 }
 775
 776 static void
 777 set_dumpfile(int sig __unused)
 778 {
 779
 780         do_dump = 1;
 781 }
 782
 783 static void
 784 set_exit(int sig __unused)
 785 {
 786
 787         do_exit = 1;
 788 }
 789
 790 static void
 791 usage(const char *progname)
 792 {
 793
 794         if (strcmp(progname, "rtsold") == 0) {
 795                 fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] "
 796                     "[-M script-name ] [-A script-name ] "
 797                     "[-p pidfile] [-R script-name] interface ...\n");
 798                 fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] "
 799                     "[-M script-name ] [-A script-name ] "
 800                     "[-p pidfile] [-R script-name] -a\n");
 801         } else {
 802                 fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
 803                     "[-M script-name ] [-A script-name ] "
 804                     "[-p pidfile] [-R script-name] interface ...\n");
 805                 fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
 806                     "[-M script-name ] [-A script-name ] "
 807                     "[-p pidfile] [-R script-name] -a\n");
 808         }
 809         exit(1);
 810 }
 811
 812 void
 813 warnmsg(int priority, const char *func, const char *msg, ...)
 814 {
 815         va_list ap;
 816         char buf[BUFSIZ];
 817
 818         va_start(ap, msg);
 819         if (fflag) {
 820                 if (priority <= log_upto)
 821                         vwarnx(msg, ap);
 822         } else {
 823                 snprintf(buf, sizeof(buf), "<%s> %s", func, msg);
 824                 msg = buf;
 825                 cap_vsyslog(capsyslog, priority, msg, ap);
 826         }
 827         va_end(ap);
 828 }
 829
 830 /*
 831  * return a list of interfaces which is suitable to sending an RS.
 832  */
 833 static char **
 834 autoifprobe(void)
 835 {
 836         static char **argv = NULL;
 837         static int n = 0;
 838         char **a;
 839         int s = 0, i, found;
 840         struct ifaddrs *ifap, *ifa;
 841         struct in6_ndireq nd;
 842
 843         /* initialize */
 844         while (n--)
 845                 free(argv[n]);
 846         if (argv) {
 847                 free(argv);
 848                 argv = NULL;
 849         }
 850         n = 0;
 851
 852         if (getifaddrs(&ifap) != 0)
 853                 return (NULL);
 854
 855         if (!Fflag && (s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 856                 warnmsg(LOG_ERR, __func__, "socket");
 857                 exit(1);
 858         }
 859
 860         /* find an ethernet */
 861         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 862                 if ((ifa->ifa_flags & IFF_UP) == 0)
 863                         continue;
 864                 if ((ifa->ifa_flags & IFF_LOOPBACK) != 0)
 865                         continue;
 866                 if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
 867                         continue;
 868
 869                 if (ifa->ifa_addr->sa_family != AF_INET6)
 870                         continue;
 871
 872                 found = 0;
 873                 for (i = 0; i < n; i++) {
 874                         if (strcmp(argv[i], ifa->ifa_name) == 0) {
 875                                 found++;
 876                                 break;
 877                         }
 878                 }
 879                 if (found)
 880                         continue;
 881
 882                 /*
 883                  * Skip the interfaces which IPv6 and/or accepting RA
 884                  * is disabled.
 885                  */
 886                 if (!Fflag) {
 887                         memset(&nd, 0, sizeof(nd));
 888                         strlcpy(nd.ifname, ifa->ifa_name, sizeof(nd.ifname));
 889                         if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
 890                                 warnmsg(LOG_ERR, __func__,
 891                                         "ioctl(SIOCGIFINFO_IN6)");
 892                                 exit(1);
 893                         }
 894                         if ((nd.ndi.flags & ND6_IFF_IFDISABLED))
 895                                 continue;
 896                         if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV))
 897                                 continue;
 898                 }
 899
 900                 /* if we find multiple candidates, just warn. */
 901                 if (n != 0 && dflag > 1)
 902                         warnmsg(LOG_WARNING, __func__,
 903                                 "multiple interfaces found");
 904
 905                 a = realloc(argv, (n + 1) * sizeof(char *));
 906                 if (a == NULL) {
 907                         warnmsg(LOG_ERR, __func__, "realloc");
 908                         exit(1);
 909                 }
 910                 argv = a;
 911                 argv[n] = strdup(ifa->ifa_name);
 912                 if (!argv[n]) {
 913                         warnmsg(LOG_ERR, __func__, "malloc");
 914                         exit(1);
 915                 }
 916                 n++;
 917         }
 918
 919         if (n) {
 920                 a = realloc(argv, (n + 1) * sizeof(char *));
 921                 if (a == NULL) {
 922                         warnmsg(LOG_ERR, __func__, "realloc");
 923                         exit(1);
 924                 }
 925                 argv = a;
 926                 argv[n] = NULL;
 927
 928                 if (dflag > 0) {
 929                         for (i = 0; i < n; i++)
 930                                 warnmsg(LOG_WARNING, __func__, "probing %s",
 931                                         argv[i]);
 932                 }
 933         }
 934         if (!Fflag)
 935                 close(s);
 936         freeifaddrs(ifap);
 937         return (argv);
 938 }