usr.sbin/rtsold/rtsold.c

   1 /*      $KAME: rtsold.c,v 1.67 2003/05/17 18:16:15 itojun Exp $ */
   2
   3 /*
   4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the project nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  * $FreeBSD$
  32  */
  33
  34 #include <sys/types.h>
  35 #include <sys/ioctl.h>
  36 #include <sys/time.h>
  37 #include <sys/socket.h>
  38 #include <sys/param.h>
  39
  40 #include <net/if.h>
  41 #include <net/if_dl.h>
  42 #include <net/if_var.h>
  43
  44 #include <netinet/in.h>
  45 #include <netinet/icmp6.h>
  46 #include <netinet/in_var.h>
  47 #include <arpa/inet.h>
  48
  49 #include <netinet6/nd6.h>
  50
  51 #include <signal.h>
  52 #include <unistd.h>
  53 #include <syslog.h>
  54 #include <string.h>
  55 #include <stdlib.h>
  56 #include <stdio.h>
  57 #include <errno.h>
  58 #include <err.h>
  59 #include <stdarg.h>
  60 #include <ifaddrs.h>
  61 #ifdef HAVE_POLL_H
  62 #include <poll.h>
  63 #endif
  64
  65 #include "rtsold.h"
  66
  67 #define RTSOL_DUMPFILE  "/var/run/rtsold.dump";
  68 #define RTSOL_PIDFILE   "/var/run/rtsold.pid";
  69
  70 struct ifinfo *iflist;
  71 struct timeval tm_max = {0x7fffffff, 0x7fffffff};
  72 static int log_upto = 999;
  73 static int fflag = 0;
  74
  75 int Fflag = 0;  /* force setting sysctl parameters */
  76 int aflag = 0;
  77 int dflag = 0;
  78 int uflag = 0;
  79
  80 const char *otherconf_script;
  81 const char *resolvconf_script = "/sbin/resolvconf";
  82
  83 /* protocol constants */
  84 #define MAX_RTR_SOLICITATION_DELAY      1 /* second */
  85 #define RTR_SOLICITATION_INTERVAL       4 /* seconds */
  86 #define MAX_RTR_SOLICITATIONS           3 /* times */
  87
  88 /*
  89  * implementation dependent constants in seconds
  90  * XXX: should be configurable
  91  */
  92 #define PROBE_INTERVAL 60
  93
  94 /* static variables and functions */
  95 static int mobile_node = 0;
  96 static const char *pidfilename = RTSOL_PIDFILE;
  97
  98 #ifndef SMALL
  99 static int do_dump;
 100 static const char *dumpfilename = RTSOL_DUMPFILE;
 101 #endif
 102
 103 #if 0
 104 static int ifreconfig(char *);
 105 #endif
 106
 107 static int make_packet(struct ifinfo *);
 108 static struct timeval *rtsol_check_timer(void);
 109
 110 #ifndef SMALL
 111 static void rtsold_set_dump_file(int);
 112 #endif
 113 static void usage(void);
 114
 115 int
 116 main(int argc, char **argv)
 117 {
 118         int s, ch, once = 0;
 119         struct timeval *timeout;
 120         const char *opts;
 121 #ifdef HAVE_POLL_H
 122         struct pollfd set[2];
 123 #else
 124         fd_set *fdsetp, *selectfdp;
 125         int fdmasks;
 126         int maxfd;
 127 #endif
 128         int rtsock;
 129         char *argv0;
 130
 131 #ifndef SMALL
 132         /* rtsold */
 133         opts = "adDfFm1O:p:R:u";
 134 #else
 135         /* rtsol */
 136         opts = "adDFO:R:u";
 137         fflag = 1;
 138         once = 1;
 139 #endif
 140         argv0 = argv[0];
 141
 142         while ((ch = getopt(argc, argv, opts)) != -1) {
 143                 switch (ch) {
 144                 case 'a':
 145                         aflag = 1;
 146                         break;
 147                 case 'd':
 148                         dflag += 1;
 149                         break;
 150                 case 'D':
 151                         dflag += 2;
 152                         break;
 153                 case 'f':
 154                         fflag = 1;
 155                         break;
 156                 case 'F':
 157                         Fflag = 1;
 158                         break;
 159                 case 'm':
 160                         mobile_node = 1;
 161                         break;
 162                 case '1':
 163                         once = 1;
 164                         break;
 165                 case 'O':
 166                         otherconf_script = optarg;
 167                         break;
 168                 case 'p':
 169                         pidfilename = optarg;
 170                         break;
 171                 case 'R':
 172                         resolvconf_script = optarg;
 173                         break;
 174                 case 'u':
 175                         uflag = 1;
 176                         break;
 177                 default:
 178                         usage();
 179                         exit(1);
 180                 }
 181         }
 182         argc -= optind;
 183         argv += optind;
 184
 185         if ((!aflag && argc == 0) || (aflag && argc != 0)) {
 186                 usage();
 187                 exit(1);
 188         }
 189
 190         /* set log level */
 191         if (dflag > 1)
 192                 log_upto = LOG_DEBUG;
 193         else if (dflag > 0)
 194                 log_upto = LOG_INFO;
 195         else
 196                 log_upto = LOG_NOTICE;
 197
 198         if (!fflag) {
 199                 char *ident;
 200
 201                 ident = strrchr(argv0, '/');
 202                 if (!ident)
 203                         ident = argv0;
 204                 else
 205                         ident++;
 206                 openlog(ident, LOG_NDELAY|LOG_PID, LOG_DAEMON);
 207                 if (log_upto >= 0)
 208                         setlogmask(LOG_UPTO(log_upto));
 209         }
 210
 211         if (otherconf_script && *otherconf_script != '/') {
 212                 errx(1, "configuration script (%s) must be an absolute path",
 213                     otherconf_script);
 214         }
 215         if (resolvconf_script && *resolvconf_script != '/') {
 216                 errx(1, "configuration script (%s) must be an absolute path",
 217                     resolvconf_script);
 218         }
 219         if (pidfilename && *pidfilename != '/') {
 220                 errx(1, "pid filename (%s) must be an absolute path",
 221                     pidfilename);
 222         }
 223 #ifndef HAVE_ARC4RANDOM
 224         /* random value initialization */
 225         srandom((u_long)time(NULL));
 226 #endif
 227
 228 #if (__FreeBSD_version < 900000)
 229         if (Fflag) {
 230                 setinet6sysctl(IPV6CTL_FORWARDING, 0);
 231         } else {
 232                 /* warn if forwarding is up */
 233                 if (getinet6sysctl(IPV6CTL_FORWARDING))
 234                         warnx("kernel is configured as a router, not a host");
 235         }
 236 #endif
 237
 238 #ifndef SMALL
 239         /* initialization to dump internal status to a file */
 240         signal(SIGUSR1, rtsold_set_dump_file);
 241 #endif
 242
 243         if (!fflag)
 244                 daemon(0, 0);           /* act as a daemon */
 245
 246         /*
 247          * Open a socket for sending RS and receiving RA.
 248          * This should be done before calling ifinit(), since the function
 249          * uses the socket.
 250          */
 251         if ((s = sockopen()) < 0) {
 252                 warnmsg(LOG_ERR, __func__, "failed to open a socket");
 253                 exit(1);
 254         }
 255 #ifdef HAVE_POLL_H
 256         set[0].fd = s;
 257         set[0].events = POLLIN;
 258 #else
 259         maxfd = s;
 260 #endif
 261
 262 #ifdef HAVE_POLL_H
 263         set[1].fd = -1;
 264 #endif
 265
 266         if ((rtsock = rtsock_open()) < 0) {
 267                 warnmsg(LOG_ERR, __func__, "failed to open a socket");
 268                 exit(1);
 269         }
 270 #ifdef HAVE_POLL_H
 271         set[1].fd = rtsock;
 272         set[1].events = POLLIN;
 273 #else
 274         if (rtsock > maxfd)
 275                 maxfd = rtsock;
 276 #endif
 277
 278 #ifndef HAVE_POLL_H
 279         fdmasks = howmany(maxfd + 1, NFDBITS) * sizeof(fd_mask);
 280         if ((fdsetp = malloc(fdmasks)) == NULL) {
 281                 warnmsg(LOG_ERR, __func__, "malloc");
 282                 exit(1);
 283         }
 284         if ((selectfdp = malloc(fdmasks)) == NULL) {
 285                 warnmsg(LOG_ERR, __func__, "malloc");
 286                 exit(1);
 287         }
 288 #endif
 289
 290         /* configuration per interface */
 291         if (ifinit()) {
 292                 warnmsg(LOG_ERR, __func__,
 293                     "failed to initialize interfaces");
 294                 exit(1);
 295         }
 296         if (aflag)
 297                 argv = autoifprobe();
 298         while (argv && *argv) {
 299                 if (ifconfig(*argv)) {
 300                         warnmsg(LOG_ERR, __func__,
 301                             "failed to initialize %s", *argv);
 302                         exit(1);
 303                 }
 304                 argv++;
 305         }
 306
 307         /* setup for probing default routers */
 308         if (probe_init()) {
 309                 warnmsg(LOG_ERR, __func__,
 310                     "failed to setup for probing routers");
 311                 exit(1);
 312                 /*NOTREACHED*/
 313         }
 314
 315         /* dump the current pid */
 316         if (!once) {
 317                 pid_t pid = getpid();
 318                 FILE *fp;
 319
 320                 if ((fp = fopen(pidfilename, "w")) == NULL)
 321                         warnmsg(LOG_ERR, __func__,
 322                             "failed to open a pid log file(%s): %s",
 323                             pidfilename, strerror(errno));
 324                 else {
 325                         fprintf(fp, "%d\n", pid);
 326                         fclose(fp);
 327                 }
 328         }
 329 #ifndef HAVE_POLL_H
 330         memset(fdsetp, 0, fdmasks);
 331         FD_SET(s, fdsetp);
 332         FD_SET(rtsock, fdsetp);
 333 #endif
 334         while (1) {             /* main loop */
 335                 int e;
 336
 337 #ifndef HAVE_POLL_H
 338                 memcpy(selectfdp, fdsetp, fdmasks);
 339 #endif
 340
 341 #ifndef SMALL
 342                 if (do_dump) {  /* SIGUSR1 */
 343                         do_dump = 0;
 344                         rtsold_dump_file(dumpfilename);
 345                 }
 346 #endif
 347
 348                 timeout = rtsol_check_timer();
 349
 350                 if (once) {
 351                         struct ifinfo *ifi;
 352
 353                         /* if we have no timeout, we are done (or failed) */
 354                         if (timeout == NULL)
 355                                 break;
 356
 357                         /* if all interfaces have got RA packet, we are done */
 358                         TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
 359                                 if (ifi->state != IFS_DOWN && ifi->racnt == 0)
 360                                         break;
 361                         }
 362                         if (ifi == NULL)
 363                                 break;
 364                 }
 365 #ifdef HAVE_POLL_H
 366                 e = poll(set, 2, timeout ? (timeout->tv_sec * 1000 + timeout->tv_usec / 1000) : INFTIM);
 367 #else
 368                 e = select(maxfd + 1, selectfdp, NULL, NULL, timeout);
 369 #endif
 370                 if (e < 1) {
 371                         if (e < 0 && errno != EINTR) {
 372                                 warnmsg(LOG_ERR, __func__, "select: %s",
 373                                     strerror(errno));
 374                         }
 375                         continue;
 376                 }
 377
 378                 /* packet reception */
 379 #ifdef HAVE_POLL_H
 380                 if (set[1].revents & POLLIN)
 381 #else
 382                 if (FD_ISSET(rtsock, selectfdp))
 383 #endif
 384                         rtsock_input(rtsock);
 385 #ifdef HAVE_POLL_H
 386                 if (set[0].revents & POLLIN)
 387 #else
 388                 if (FD_ISSET(s, selectfdp))
 389 #endif
 390                         rtsol_input(s);
 391         }
 392         /* NOTREACHED */
 393
 394         return (0);
 395 }
 396
 397 int
 398 ifconfig(char *ifname)
 399 {
 400         struct ifinfo *ifi;
 401         struct sockaddr_dl *sdl;
 402         int flags;
 403
 404         if ((sdl = if_nametosdl(ifname)) == NULL) {
 405                 warnmsg(LOG_ERR, __func__,
 406                     "failed to get link layer information for %s", ifname);
 407                 return (-1);
 408         }
 409         if (find_ifinfo(sdl->sdl_index)) {
 410                 warnmsg(LOG_ERR, __func__,
 411                     "interface %s was already configured", ifname);
 412                 free(sdl);
 413                 return (-1);
 414         }
 415
 416         if (Fflag) {
 417                 struct in6_ndireq nd;
 418                 int s;
 419
 420                 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 421                         warnmsg(LOG_ERR, __func__, "socket() failed.");
 422                         return (-1);
 423                 }
 424                 memset(&nd, 0, sizeof(nd));
 425                 strlcpy(nd.ifname, ifname, sizeof(nd.ifname));
 426                 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
 427                         warnmsg(LOG_ERR, __func__,
 428                             "cannot get accept_rtadv flag");
 429                         close(s);
 430                         return (-1);
 431                 }
 432                 nd.ndi.flags |= ND6_IFF_ACCEPT_RTADV;
 433                 if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd) < 0) {
 434                         warnmsg(LOG_ERR, __func__,
 435                             "cannot set accept_rtadv flag");
 436                         close(s);
 437                         return (-1);
 438                 }
 439                 close(s);
 440         }
 441
 442         if ((ifi = malloc(sizeof(*ifi))) == NULL) {
 443                 warnmsg(LOG_ERR, __func__, "memory allocation failed");
 444                 free(sdl);
 445                 return (-1);
 446         }
 447         memset(ifi, 0, sizeof(*ifi));
 448         ifi->sdl = sdl;
 449         ifi->ifi_rdnss = IFI_DNSOPT_STATE_NOINFO;
 450         ifi->ifi_dnssl = IFI_DNSOPT_STATE_NOINFO;
 451         TAILQ_INIT(&ifi->ifi_rainfo);
 452         strlcpy(ifi->ifname, ifname, sizeof(ifi->ifname));
 453
 454         /* construct a router solicitation message */
 455         if (make_packet(ifi))
 456                 goto bad;
 457
 458         /* set link ID of this interface. */
 459 #ifdef HAVE_SCOPELIB
 460         if (inet_zoneid(AF_INET6, 2, ifname, &ifi->linkid))
 461                 goto bad;
 462 #else
 463         /* XXX: assume interface IDs as link IDs */
 464         ifi->linkid = ifi->sdl->sdl_index;
 465 #endif
 466
 467         /*
 468          * check if the interface is available.
 469          * also check if SIOCGIFMEDIA ioctl is OK on the interface.
 470          */
 471         ifi->mediareqok = 1;
 472         ifi->active = interface_status(ifi);
 473         if (!ifi->mediareqok) {
 474                 /*
 475                  * probe routers periodically even if the link status
 476                  * does not change.
 477                  */
 478                 ifi->probeinterval = PROBE_INTERVAL;
 479         }
 480
 481         /* activate interface: interface_up returns 0 on success */
 482         flags = interface_up(ifi->ifname);
 483         if (flags == 0)
 484                 ifi->state = IFS_DELAY;
 485         else if (flags == IFS_TENTATIVE)
 486                 ifi->state = IFS_TENTATIVE;
 487         else
 488                 ifi->state = IFS_DOWN;
 489
 490         rtsol_timer_update(ifi);
 491
 492         TAILQ_INSERT_TAIL(&ifinfo_head, ifi, ifi_next);
 493         return (0);
 494
 495 bad:
 496         free(ifi->sdl);
 497         free(ifi);
 498         return (-1);
 499 }
 500
 501 void
 502 iflist_init(void)
 503 {
 504         struct ifinfo *ifi;
 505
 506         while ((ifi = TAILQ_FIRST(&ifinfo_head)) != NULL) {
 507                 TAILQ_REMOVE(&ifinfo_head, ifi, ifi_next);
 508                 if (ifi->sdl != NULL)
 509                         free(ifi->sdl);
 510                 if (ifi->rs_data != NULL)
 511                         free(ifi->rs_data);
 512                 free(ifi);
 513         }
 514 }
 515
 516 #if 0
 517 static int
 518 ifreconfig(char *ifname)
 519 {
 520         struct ifinfo *ifi, *prev;
 521         int rv;
 522
 523         prev = NULL;
 524         TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
 525                 if (strncmp(ifi->ifname, ifname, sizeof(ifi->ifname)) == 0)
 526                         break;
 527                 prev = ifi;
 528         }
 529         prev->next = ifi->next;
 530
 531         rv = ifconfig(ifname);
 532
 533         /* reclaim it after ifconfig() in case ifname is pointer inside ifi */
 534         if (ifi->rs_data)
 535                 free(ifi->rs_data);
 536         free(ifi->sdl);
 537         free(ifi);
 538
 539         return (rv);
 540 }
 541 #endif
 542
 543 struct rainfo *
 544 find_rainfo(struct ifinfo *ifi, struct sockaddr_in6 *sin6)
 545 {
 546         struct rainfo *rai;
 547
 548         TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next)
 549                 if (memcmp(&rai->rai_saddr.sin6_addr, &sin6->sin6_addr,
 550                     sizeof(rai->rai_saddr.sin6_addr)) == 0)
 551                         return (rai);
 552
 553         return (NULL);
 554 }
 555
 556 struct ifinfo *
 557 find_ifinfo(int ifindex)
 558 {
 559         struct ifinfo *ifi;
 560
 561         TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
 562                 if (ifi->sdl->sdl_index == ifindex)
 563                         return (ifi);
 564         }
 565         return (NULL);
 566 }
 567
 568 static int
 569 make_packet(struct ifinfo *ifi)
 570 {
 571         size_t packlen = sizeof(struct nd_router_solicit), lladdroptlen = 0;
 572         struct nd_router_solicit *rs;
 573         char *buf;
 574
 575         if ((lladdroptlen = lladdropt_length(ifi->sdl)) == 0) {
 576                 warnmsg(LOG_INFO, __func__,
 577                     "link-layer address option has null length"
 578                     " on %s. Treat as not included.", ifi->ifname);
 579         }
 580         packlen += lladdroptlen;
 581         ifi->rs_datalen = packlen;
 582
 583         /* allocate buffer */
 584         if ((buf = malloc(packlen)) == NULL) {
 585                 warnmsg(LOG_ERR, __func__,
 586                     "memory allocation failed for %s", ifi->ifname);
 587                 return (-1);
 588         }
 589         ifi->rs_data = buf;
 590
 591         /* fill in the message */
 592         rs = (struct nd_router_solicit *)buf;
 593         rs->nd_rs_type = ND_ROUTER_SOLICIT;
 594         rs->nd_rs_code = 0;
 595         rs->nd_rs_cksum = 0;
 596         rs->nd_rs_reserved = 0;
 597         buf += sizeof(*rs);
 598
 599         /* fill in source link-layer address option */
 600         if (lladdroptlen)
 601                 lladdropt_fill(ifi->sdl, (struct nd_opt_hdr *)buf);
 602
 603         return (0);
 604 }
 605
 606 static struct timeval *
 607 rtsol_check_timer(void)
 608 {
 609         static struct timeval returnval;
 610         struct timeval now, rtsol_timer;
 611         struct ifinfo *ifi;
 612         struct rainfo *rai;
 613         struct ra_opt *rao;
 614         int flags;
 615
 616         gettimeofday(&now, NULL);
 617
 618         rtsol_timer = tm_max;
 619
 620         TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
 621                 if (timercmp(&ifi->expire, &now, <=)) {
 622                         warnmsg(LOG_DEBUG, __func__, "timer expiration on %s, "
 623                             "state = %d", ifi->ifname, ifi->state);
 624
 625                         while((rai = TAILQ_FIRST(&ifi->ifi_rainfo)) != NULL) {
 626                                 /* Remove all RA options. */
 627                                 TAILQ_REMOVE(&ifi->ifi_rainfo, rai, rai_next);
 628                                 while ((rao = TAILQ_FIRST(&rai->rai_ra_opt)) !=
 629                                     NULL) {
 630                                         TAILQ_REMOVE(&rai->rai_ra_opt, rao,
 631                                             rao_next);
 632                                         if (rao->rao_msg != NULL)
 633                                                 free(rao->rao_msg);
 634                                         free(rao);
 635                                 }
 636                                 free(rai);
 637                         }
 638                         switch (ifi->state) {
 639                         case IFS_DOWN:
 640                         case IFS_TENTATIVE:
 641                                 /* interface_up returns 0 on success */
 642                                 flags = interface_up(ifi->ifname);
 643                                 if (flags == 0)
 644                                         ifi->state = IFS_DELAY;
 645                                 else if (flags == IFS_TENTATIVE)
 646                                         ifi->state = IFS_TENTATIVE;
 647                                 else
 648                                         ifi->state = IFS_DOWN;
 649                                 break;
 650                         case IFS_IDLE:
 651                         {
 652                                 int oldstatus = ifi->active;
 653                                 int probe = 0;
 654
 655                                 ifi->active = interface_status(ifi);
 656
 657                                 if (oldstatus != ifi->active) {
 658                                         warnmsg(LOG_DEBUG, __func__,
 659                                             "%s status is changed"
 660                                             " from %d to %d",
 661                                             ifi->ifname,
 662                                             oldstatus, ifi->active);
 663                                         probe = 1;
 664                                         ifi->state = IFS_DELAY;
 665                                 } else if (ifi->probeinterval &&
 666                                     (ifi->probetimer -=
 667                                     ifi->timer.tv_sec) <= 0) {
 668                                         /* probe timer expired */
 669                                         ifi->probetimer =
 670                                             ifi->probeinterval;
 671                                         probe = 1;
 672                                         ifi->state = IFS_PROBE;
 673                                 }
 674
 675                                 /*
 676                                  * If we need a probe, clear the previous
 677                                  * status wrt the "other" configuration.
 678                                  */
 679                                 if (probe)
 680                                         ifi->otherconfig = 0;
 681
 682                                 if (probe && mobile_node)
 683                                         defrouter_probe(ifi);
 684                                 break;
 685                         }
 686                         case IFS_DELAY:
 687                                 ifi->state = IFS_PROBE;
 688                                 sendpacket(ifi);
 689                                 break;
 690                         case IFS_PROBE:
 691                                 if (ifi->probes < MAX_RTR_SOLICITATIONS)
 692                                         sendpacket(ifi);
 693                                 else {
 694                                         warnmsg(LOG_INFO, __func__,
 695                                             "No answer after sending %d RSs",
 696                                             ifi->probes);
 697                                         ifi->probes = 0;
 698                                         ifi->state = IFS_IDLE;
 699                                 }
 700                                 break;
 701                         }
 702                         rtsol_timer_update(ifi);
 703                 } else {
 704                         /* Expiration check for RA options. */
 705                         int expire = 0;
 706
 707                         TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next) {
 708                                 TAILQ_FOREACH(rao, &rai->rai_ra_opt, rao_next) {
 709                                         warnmsg(LOG_DEBUG, __func__,
 710                                             "RA expiration timer: "
 711                                             "type=%d, msg=%s, expire=%s",
 712                                             rao->rao_type, (char *)rao->rao_msg,
 713                                                 sec2str(&rao->rao_expire));
 714                                         if (timercmp(&now, &rao->rao_expire,
 715                                             >=)) {
 716                                                 warnmsg(LOG_DEBUG, __func__,
 717                                                     "RA expiration timer: "
 718                                                     "expired.");
 719                                                 TAILQ_REMOVE(&rai->rai_ra_opt,
 720                                                     rao, rao_next);
 721                                                 if (rao->rao_msg != NULL)
 722                                                         free(rao->rao_msg);
 723                                                 free(rao);
 724                                                 expire = 1;
 725                                         }
 726                                 }
 727                         }
 728                         if (expire)
 729                                 ra_opt_handler(ifi);
 730                 }
 731                 if (timercmp(&ifi->expire, &rtsol_timer, <))
 732                         rtsol_timer = ifi->expire;
 733         }
 734
 735         if (timercmp(&rtsol_timer, &tm_max, ==)) {
 736                 warnmsg(LOG_DEBUG, __func__, "there is no timer");
 737                 return (NULL);
 738         } else if (timercmp(&rtsol_timer, &now, <))
 739                 /* this may occur when the interval is too small */
 740                 returnval.tv_sec = returnval.tv_usec = 0;
 741         else
 742                 timersub(&rtsol_timer, &now, &returnval);
 743
 744         now.tv_sec += returnval.tv_sec;
 745         now.tv_usec += returnval.tv_usec;
 746         warnmsg(LOG_DEBUG, __func__, "New timer is %s",
 747             sec2str(&now));
 748
 749         return (&returnval);
 750 }
 751
 752 void
 753 rtsol_timer_update(struct ifinfo *ifi)
 754 {
 755 #define MILLION 1000000
 756 #define DADRETRY 10             /* XXX: adhoc */
 757         long interval;
 758         struct timeval now;
 759
 760         bzero(&ifi->timer, sizeof(ifi->timer));
 761
 762         switch (ifi->state) {
 763         case IFS_DOWN:
 764         case IFS_TENTATIVE:
 765                 if (++ifi->dadcount > DADRETRY) {
 766                         ifi->dadcount = 0;
 767                         ifi->timer.tv_sec = PROBE_INTERVAL;
 768                 } else
 769                         ifi->timer.tv_sec = 1;
 770                 break;
 771         case IFS_IDLE:
 772                 if (mobile_node) {
 773                         /* XXX should be configurable */
 774                         ifi->timer.tv_sec = 3;
 775                 }
 776                 else
 777                         ifi->timer = tm_max;    /* stop timer(valid?) */
 778                 break;
 779         case IFS_DELAY:
 780 #ifndef HAVE_ARC4RANDOM
 781                 interval = random() % (MAX_RTR_SOLICITATION_DELAY * MILLION);
 782 #else
 783                 interval = arc4random_uniform(MAX_RTR_SOLICITATION_DELAY * MILLION);
 784 #endif
 785                 ifi->timer.tv_sec = interval / MILLION;
 786                 ifi->timer.tv_usec = interval % MILLION;
 787                 break;
 788         case IFS_PROBE:
 789                 if (ifi->probes < MAX_RTR_SOLICITATIONS)
 790                         ifi->timer.tv_sec = RTR_SOLICITATION_INTERVAL;
 791                 else {
 792                         /*
 793                          * After sending MAX_RTR_SOLICITATIONS solicitations,
 794                          * we're just waiting for possible replies; there
 795                          * will be no more solicitation.  Thus, we change
 796                          * the timer value to MAX_RTR_SOLICITATION_DELAY based
 797                          * on RFC 2461, Section 6.3.7.
 798                          */
 799                         ifi->timer.tv_sec = MAX_RTR_SOLICITATION_DELAY;
 800                 }
 801                 break;
 802         default:
 803                 warnmsg(LOG_ERR, __func__,
 804                     "illegal interface state(%d) on %s",
 805                     ifi->state, ifi->ifname);
 806                 return;
 807         }
 808
 809         /* reset the timer */
 810         if (timercmp(&ifi->timer, &tm_max, ==)) {
 811                 ifi->expire = tm_max;
 812                 warnmsg(LOG_DEBUG, __func__,
 813                     "stop timer for %s", ifi->ifname);
 814         } else {
 815                 gettimeofday(&now, NULL);
 816                 timeradd(&now, &ifi->timer, &ifi->expire);
 817
 818                 now.tv_sec += ifi->timer.tv_sec;
 819                 now.tv_usec += ifi->timer.tv_usec;
 820                 warnmsg(LOG_DEBUG, __func__, "set timer for %s to %s",
 821                     ifi->ifname, sec2str(&now));
 822         }
 823
 824 #undef MILLION
 825 }
 826
 827 /* timer related utility functions */
 828 #define MILLION 1000000
 829
 830 #ifndef SMALL
 831 static void
 832 rtsold_set_dump_file(int sig __unused)
 833 {
 834         do_dump = 1;
 835 }
 836 #endif
 837
 838 static void
 839 usage(void)
 840 {
 841 #ifndef SMALL
 842         fprintf(stderr, "usage: rtsold [-adDfFm1] [-O script-name] "
 843             "[-P pidfile] [-R script-name] interfaces...\n");
 844         fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] "
 845             "[-P pidfile] [-R script-name] -a\n");
 846 #else
 847         fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
 848             "[-P pidfile] [-R script-name] interfaces...\n");
 849         fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
 850             "[-P pidfile] [-R script-name] -a\n");
 851 #endif
 852 }
 853
 854 void
 855 warnmsg(int priority, const char *func, const char *msg, ...)
 856 {
 857         va_list ap;
 858         char buf[BUFSIZ];
 859
 860         va_start(ap, msg);
 861         if (fflag) {
 862                 if (priority <= log_upto) {
 863                         (void)vfprintf(stderr, msg, ap);
 864                         (void)fprintf(stderr, "\n");
 865                 }
 866         } else {
 867                 snprintf(buf, sizeof(buf), "<%s> %s", func, msg);
 868                 msg = buf;
 869                 vsyslog(priority, msg, ap);
 870         }
 871         va_end(ap);
 872 }
 873
 874 /*
 875  * return a list of interfaces which is suitable to sending an RS.
 876  */
 877 char **
 878 autoifprobe(void)
 879 {
 880         static char **argv = NULL;
 881         static int n = 0;
 882         char **a;
 883         int s = 0, i, found;
 884         struct ifaddrs *ifap, *ifa, *target;
 885         struct in6_ndireq nd;
 886
 887         /* initialize */
 888         while (n--)
 889                 free(argv[n]);
 890         if (argv) {
 891                 free(argv);
 892                 argv = NULL;
 893         }
 894         n = 0;
 895
 896         if (getifaddrs(&ifap) != 0)
 897                 return (NULL);
 898
 899         if (!Fflag && (s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 900                 warnmsg(LOG_ERR, __func__, "socket");
 901                 exit(1);
 902         }
 903
 904         target = NULL;
 905         /* find an ethernet */
 906         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 907                 if ((ifa->ifa_flags & IFF_UP) == 0)
 908                         continue;
 909                 if ((ifa->ifa_flags & IFF_POINTOPOINT) != 0)
 910                         continue;
 911                 if ((ifa->ifa_flags & IFF_LOOPBACK) != 0)
 912                         continue;
 913                 if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
 914                         continue;
 915
 916                 if (ifa->ifa_addr->sa_family != AF_INET6)
 917                         continue;
 918
 919                 found = 0;
 920                 for (i = 0; i < n; i++) {
 921                         if (strcmp(argv[i], ifa->ifa_name) == 0) {
 922                                 found++;
 923                                 break;
 924                         }
 925                 }
 926                 if (found)
 927                         continue;
 928
 929                 /*
 930                  * Skip the interfaces which IPv6 and/or accepting RA
 931                  * is disabled.
 932                  */
 933                 if (!Fflag) {
 934                         memset(&nd, 0, sizeof(nd));
 935                         strlcpy(nd.ifname, ifa->ifa_name, sizeof(nd.ifname));
 936                         if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
 937                                 warnmsg(LOG_ERR, __func__,
 938                                         "ioctl(SIOCGIFINFO_IN6)");
 939                                 exit(1);
 940                         }
 941                         if ((nd.ndi.flags & ND6_IFF_IFDISABLED))
 942                                 continue;
 943                         if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV))
 944                                 continue;
 945                 }
 946
 947                 /* if we find multiple candidates, just warn. */
 948                 if (n != 0 && dflag > 1)
 949                         warnmsg(LOG_WARNING, __func__,
 950                                 "multiple interfaces found");
 951
 952                 a = (char **)realloc(argv, (n + 1) * sizeof(char **));
 953                 if (a == NULL) {
 954                         warnmsg(LOG_ERR, __func__, "realloc");
 955                         exit(1);
 956                 }
 957                 argv = a;
 958                 argv[n] = strdup(ifa->ifa_name);
 959                 if (!argv[n]) {
 960                         warnmsg(LOG_ERR, __func__, "malloc");
 961                         exit(1);
 962                 }
 963                 n++;
 964         }
 965
 966         if (n) {
 967                 a = (char **)realloc(argv, (n + 1) * sizeof(char **));
 968                 if (a == NULL) {
 969                         warnmsg(LOG_ERR, __func__, "realloc");
 970                         exit(1);
 971                 }
 972                 argv = a;
 973                 argv[n] = NULL;
 974
 975                 if (dflag > 0) {
 976                         for (i = 0; i < n; i++)
 977                                 warnmsg(LOG_WARNING, __func__, "probing %s",
 978                                         argv[i]);
 979                 }
 980         }
 981         if (!Fflag)
 982                 close(s);
 983         freeifaddrs(ifap);
 984         return (argv);
 985 }