usr.sbin/rtsold/rtsold.c

   1 /*      $KAME: rtsold.c,v 1.67 2003/05/17 18:16:15 itojun Exp $ */
   2
   3 /*-
   4  * SPDX-License-Identifier: BSD-3-Clause
   5  *
   6  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the project nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * $FreeBSD$
  34  */
  35
  36 #include <sys/param.h>
  37 #include <sys/capsicum.h>
  38 #include <sys/event.h>
  39 #include <sys/ioctl.h>
  40 #include <sys/socket.h>
  41
  42 #include <net/if.h>
  43 #include <net/if_dl.h>
  44
  45 #include <netinet/in.h>
  46 #include <netinet/icmp6.h>
  47 #include <netinet/in_var.h>
  48 #include <arpa/inet.h>
  49
  50 #include <netinet6/nd6.h>
  51
  52 #include <capsicum_helpers.h>
  53 #include <err.h>
  54 #include <errno.h>
  55 #include <ifaddrs.h>
  56 #include <libgen.h>
  57 #include <signal.h>
  58 #include <stdarg.h>
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62 #include <syslog.h>
  63 #include <time.h>
  64 #include <unistd.h>
  65
  66 #include <libcasper.h>
  67 #include <casper/cap_syslog.h>
  68 #include <libutil.h>
  69
  70 #include "rtsold.h"
  71
  72 #define RTSOL_DUMPFILE  "/var/run/rtsold.dump"
  73
  74 struct timespec tm_max;
  75 static int log_upto = 999;
  76 static int fflag = 0;
  77
  78 int Fflag = 0;  /* force setting sysctl parameters */
  79 int aflag = 0;
  80 int dflag = 0;
  81 int uflag = 0;
  82
  83 const char *managedconf_script;
  84 const char *otherconf_script;
  85 const char *alwaysconf_script;
  86 const char *resolvconf_script = "/sbin/resolvconf";
  87
  88 cap_channel_t *capllflags, *capscript, *capsendmsg, *capsyslog;
  89
  90 /* protocol constants */
  91 #define MAX_RTR_SOLICITATION_DELAY      1 /* second */
  92 #define RTR_SOLICITATION_INTERVAL       4 /* seconds */
  93 #define MAX_RTR_SOLICITATIONS           3 /* times */
  94
  95 /*
  96  * implementation dependent constants in seconds
  97  * XXX: should be configurable
  98  */
  99 #define PROBE_INTERVAL 60
 100
 101 /* static variables and functions */
 102 static int mobile_node = 0;
 103 static int no_solicitation_delay = 0;
 104
 105 static sig_atomic_t do_dump, do_exit;
 106 static struct pidfh *pfh;
 107
 108 static char **autoifprobe(void);
 109 static int ifconfig(char *ifname);
 110 static int init_capabilities(void);
 111 static int make_packet(struct ifinfo *);
 112 static struct timespec *rtsol_check_timer(void);
 113
 114 static void set_dumpfile(int);
 115 static void set_exit(int);
 116 static void usage(const char *progname);
 117
 118 int
 119 main(int argc, char **argv)
 120 {
 121         struct kevent events[2];
 122         FILE *dumpfp;
 123         struct ifinfo *ifi;
 124         struct timespec *timeout;
 125         const char *opts, *pidfilepath, *progname;
 126         int ch, error, kq, once, rcvsock, rtsock;
 127
 128         progname = basename(argv[0]);
 129         if (strcmp(progname, "rtsold") == 0) {
 130                 opts = "adDfFim1M:O:A:p:R:u";
 131                 once = 0;
 132                 pidfilepath = NULL;
 133         } else {
 134                 opts = "adDFiM:O:A:R:u";
 135                 fflag = 1;
 136                 once = 1;
 137         }
 138
 139         while ((ch = getopt(argc, argv, opts)) != -1) {
 140                 switch (ch) {
 141                 case 'a':
 142                         aflag = 1;
 143                         break;
 144                 case 'd':
 145                         dflag += 1;
 146                         break;
 147                 case 'D':
 148                         dflag += 2;
 149                         break;
 150                 case 'f':
 151                         fflag = 1;
 152                         break;
 153                 case 'F':
 154                         Fflag = 1;
 155                         break;
 156                 case 'i':
 157                         no_solicitation_delay = 1;
 158                         break;
 159                 case 'm':
 160                         mobile_node = 1;
 161                         break;
 162                 case '1':
 163                         once = 1;
 164                         break;
 165                 case 'M':
 166                         managedconf_script = optarg;
 167                         break;
 168                 case 'O':
 169                         otherconf_script = optarg;
 170                         break;
 171                 case 'A':
 172                         alwaysconf_script = optarg;
 173                         break;
 174                 case 'p':
 175                         pidfilepath = optarg;
 176                         break;
 177                 case 'R':
 178                         resolvconf_script = optarg;
 179                         break;
 180                 case 'u':
 181                         uflag = 1;
 182                         break;
 183                 default:
 184                         usage(progname);
 185                 }
 186         }
 187         argc -= optind;
 188         argv += optind;
 189
 190         if ((!aflag && argc == 0) || (aflag && argc != 0))
 191                 usage(progname);
 192
 193         /* Generate maximum time in timespec. */
 194         tm_max.tv_sec = (-1) & ~((time_t)1 << ((sizeof(tm_max.tv_sec) * 8) - 1));
 195         tm_max.tv_nsec = (-1) & ~((long)1 << ((sizeof(tm_max.tv_nsec) * 8) - 1));
 196
 197         /* set log level */
 198         if (dflag > 1)
 199                 log_upto = LOG_DEBUG;
 200         else if (dflag > 0)
 201                 log_upto = LOG_INFO;
 202         else
 203                 log_upto = LOG_NOTICE;
 204
 205         if (managedconf_script != NULL && *managedconf_script != '/')
 206                 errx(1, "configuration script (%s) must be an absolute path",
 207                     managedconf_script);
 208         if (otherconf_script != NULL && *otherconf_script != '/')
 209                 errx(1, "configuration script (%s) must be an absolute path",
 210                     otherconf_script);
 211         if (alwaysconf_script != NULL && *alwaysconf_script != '/')
 212                 errx(1, "configuration script (%s) must be an absolute path",
 213                     alwaysconf_script);
 214         if (*resolvconf_script != '/')
 215                 errx(1, "configuration script (%s) must be an absolute path",
 216                     resolvconf_script);
 217
 218         if (!fflag) {
 219                 pfh = pidfile_open(pidfilepath, 0644, NULL);
 220                 if (pfh == NULL)
 221                         errx(1, "failed to open pidfile: %s", strerror(errno));
 222                 if (daemon(0, 0) != 0)
 223                         errx(1, "failed to daemonize");
 224         }
 225
 226         if ((error = init_capabilities()) != 0)
 227                 err(1, "failed to initialize capabilities");
 228
 229         if (!fflag) {
 230                 cap_openlog(capsyslog, progname, LOG_NDELAY | LOG_PID,
 231                     LOG_DAEMON);
 232                 if (log_upto >= 0)
 233                         (void)cap_setlogmask(capsyslog, LOG_UPTO(log_upto));
 234                 (void)signal(SIGTERM, set_exit);
 235                 (void)signal(SIGINT, set_exit);
 236                 (void)signal(SIGUSR1, set_dumpfile);
 237                 dumpfp = rtsold_init_dumpfile(RTSOL_DUMPFILE);
 238         } else
 239                 dumpfp = NULL;
 240
 241         kq = kqueue();
 242         if (kq < 0) {
 243                 warnmsg(LOG_ERR, __func__, "failed to create a kqueue: %s",
 244                     strerror(errno));
 245                 exit(1);
 246         }
 247
 248         /* Open global sockets and register for read events. */
 249         if ((rtsock = rtsock_open()) < 0) {
 250                 warnmsg(LOG_ERR, __func__, "failed to open routing socket");
 251                 exit(1);
 252         }
 253         if ((rcvsock = recvsockopen()) < 0) {
 254                 warnmsg(LOG_ERR, __func__, "failed to open receive socket");
 255                 exit(1);
 256         }
 257         EV_SET(&events[0], rtsock, EVFILT_READ, EV_ADD, 0, 0, NULL);
 258         EV_SET(&events[1], rcvsock, EVFILT_READ, EV_ADD, 0, 0, NULL);
 259         if (kevent(kq, events, 2, NULL, 0, NULL) < 0) {
 260                 warnmsg(LOG_ERR, __func__, "kevent(): %s", strerror(errno));
 261                 exit(1);
 262         }
 263
 264         /* Probe network interfaces and set up tracking info. */
 265         if (ifinit() != 0) {
 266                 warnmsg(LOG_ERR, __func__, "failed to initialize interfaces");
 267                 exit(1);
 268         }
 269         if (aflag)
 270                 argv = autoifprobe();
 271         while (argv && *argv) {
 272                 if (ifconfig(*argv)) {
 273                         warnmsg(LOG_ERR, __func__,
 274                             "failed to initialize %s", *argv);
 275                         exit(1);
 276                 }
 277                 argv++;
 278         }
 279
 280         /* Write to our pidfile. */
 281         if (pfh != NULL && pidfile_write(pfh) != 0) {
 282                 warnmsg(LOG_ERR, __func__,
 283                     "failed to open pidfile: %s", strerror(errno));
 284                 exit(1);
 285         }
 286
 287         /* Enter capability mode. */
 288         caph_cache_catpages();
 289         if (caph_enter_casper() != 0) {
 290                 warnmsg(LOG_ERR, __func__, "caph_enter(): %s", strerror(errno));
 291                 exit(1);
 292         }
 293
 294         for (;;) {
 295                 if (do_exit) {
 296                         /* Handle SIGTERM, SIGINT. */
 297                         if (pfh != NULL)
 298                                 pidfile_remove(pfh);
 299                         break;
 300                 }
 301                 if (do_dump) {
 302                         /* Handle SIGUSR1. */
 303                         do_dump = 0;
 304                         if (dumpfp != NULL)
 305                                 rtsold_dump(dumpfp);
 306                 }
 307
 308                 timeout = rtsol_check_timer();
 309
 310                 if (once) {
 311                         /* if we have no timeout, we are done (or failed) */
 312                         if (timeout == NULL)
 313                                 break;
 314
 315                         /* if all interfaces have got RA packet, we are done */
 316                         TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
 317                                 if (ifi->state != IFS_DOWN && ifi->racnt == 0)
 318                                         break;
 319                         }
 320                         if (ifi == NULL)
 321                                 break;
 322                 }
 323
 324                 error = kevent(kq, NULL, 0, &events[0], 1, timeout);
 325                 if (error < 1) {
 326                         if (error < 0 && errno != EINTR)
 327                                 warnmsg(LOG_ERR, __func__, "kevent(): %s",
 328                                     strerror(errno));
 329                         continue;
 330                 }
 331
 332                 if (events[0].ident == (uintptr_t)rtsock)
 333                         rtsock_input(rtsock);
 334                 else
 335                         rtsol_input(rcvsock);
 336         }
 337
 338         return (0);
 339 }
 340
 341 static int
 342 init_capabilities(void)
 343 {
 344 #ifdef WITH_CASPER
 345         const char *const scripts[] =
 346             { resolvconf_script, managedconf_script, otherconf_script,
 347             alwaysconf_script };
 348         cap_channel_t *capcasper;
 349         nvlist_t *limits;
 350
 351         capcasper = cap_init();
 352         if (capcasper == NULL)
 353                 return (-1);
 354
 355         capllflags = cap_service_open(capcasper, "rtsold.llflags");
 356         if (capllflags == NULL)
 357                 return (-1);
 358
 359         capscript = cap_service_open(capcasper, "rtsold.script");
 360         if (capscript == NULL)
 361                 return (-1);
 362         limits = nvlist_create(0);
 363         for (size_t i = 0; i < nitems(scripts); i++)
 364                 if (scripts[i] != NULL)
 365                         nvlist_append_string_array(limits, "scripts",
 366                             scripts[i]);
 367         if (cap_limit_set(capscript, limits) != 0)
 368                 return (-1);
 369
 370         capsendmsg = cap_service_open(capcasper, "rtsold.sendmsg");
 371         if (capsendmsg == NULL)
 372                 return (-1);
 373
 374         if (!fflag) {
 375                 capsyslog = cap_service_open(capcasper, "system.syslog");
 376                 if (capsyslog == NULL)
 377                         return (-1);
 378         }
 379
 380         cap_close(capcasper);
 381 #endif /* WITH_CASPER */
 382         return (0);
 383 }
 384
 385 static int
 386 ifconfig(char *ifname)
 387 {
 388         struct ifinfo *ifi;
 389         struct sockaddr_dl *sdl;
 390         int flags;
 391
 392         ifi = NULL;
 393         if ((sdl = if_nametosdl(ifname)) == NULL) {
 394                 warnmsg(LOG_ERR, __func__,
 395                     "failed to get link layer information for %s", ifname);
 396                 goto bad;
 397         }
 398         if (find_ifinfo(sdl->sdl_index)) {
 399                 warnmsg(LOG_ERR, __func__,
 400                     "interface %s was already configured", ifname);
 401                 goto bad;
 402         }
 403
 404         if (Fflag) {
 405                 struct in6_ndireq nd;
 406                 int s;
 407
 408                 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 409                         warnmsg(LOG_ERR, __func__, "socket() failed.");
 410                         goto bad;
 411                 }
 412                 memset(&nd, 0, sizeof(nd));
 413                 strlcpy(nd.ifname, ifname, sizeof(nd.ifname));
 414                 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
 415                         warnmsg(LOG_ERR, __func__,
 416                             "cannot get accept_rtadv flag");
 417                         (void)close(s);
 418                         goto bad;
 419                 }
 420                 nd.ndi.flags |= ND6_IFF_ACCEPT_RTADV;
 421                 if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd) < 0) {
 422                         warnmsg(LOG_ERR, __func__,
 423                             "cannot set accept_rtadv flag");
 424                         (void)close(s);
 425                         goto bad;
 426                 }
 427                 (void)close(s);
 428         }
 429
 430         if ((ifi = malloc(sizeof(*ifi))) == NULL) {
 431                 warnmsg(LOG_ERR, __func__, "memory allocation failed");
 432                 goto bad;
 433         }
 434         memset(ifi, 0, sizeof(*ifi));
 435         ifi->sdl = sdl;
 436         ifi->ifi_rdnss = IFI_DNSOPT_STATE_NOINFO;
 437         ifi->ifi_dnssl = IFI_DNSOPT_STATE_NOINFO;
 438         TAILQ_INIT(&ifi->ifi_rainfo);
 439         strlcpy(ifi->ifname, ifname, sizeof(ifi->ifname));
 440
 441         /* construct a router solicitation message */
 442         if (make_packet(ifi))
 443                 goto bad;
 444
 445         /* set link ID of this interface. */
 446 #ifdef HAVE_SCOPELIB
 447         if (inet_zoneid(AF_INET6, 2, ifname, &ifi->linkid))
 448                 goto bad;
 449 #else
 450         /* XXX: assume interface IDs as link IDs */
 451         ifi->linkid = ifi->sdl->sdl_index;
 452 #endif
 453
 454         /*
 455          * check if the interface is available.
 456          * also check if SIOCGIFMEDIA ioctl is OK on the interface.
 457          */
 458         ifi->mediareqok = 1;
 459         ifi->active = interface_status(ifi);
 460         if (!ifi->mediareqok) {
 461                 /*
 462                  * probe routers periodically even if the link status
 463                  * does not change.
 464                  */
 465                 ifi->probeinterval = PROBE_INTERVAL;
 466         }
 467
 468         /* activate interface: interface_up returns 0 on success */
 469         flags = interface_up(ifi->ifname);
 470         if (flags == 0)
 471                 ifi->state = IFS_DELAY;
 472         else if (flags == IFS_TENTATIVE)
 473                 ifi->state = IFS_TENTATIVE;
 474         else
 475                 ifi->state = IFS_DOWN;
 476
 477         rtsol_timer_update(ifi);
 478
 479         TAILQ_INSERT_TAIL(&ifinfo_head, ifi, ifi_next);
 480         return (0);
 481
 482 bad:
 483         free(sdl);
 484         free(ifi);
 485         return (-1);
 486 }
 487
 488 struct rainfo *
 489 find_rainfo(struct ifinfo *ifi, struct sockaddr_in6 *sin6)
 490 {
 491         struct rainfo *rai;
 492
 493         TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next)
 494                 if (memcmp(&rai->rai_saddr.sin6_addr, &sin6->sin6_addr,
 495                     sizeof(rai->rai_saddr.sin6_addr)) == 0)
 496                         return (rai);
 497
 498         return (NULL);
 499 }
 500
 501 struct ifinfo *
 502 find_ifinfo(int ifindex)
 503 {
 504         struct ifinfo *ifi;
 505
 506         TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
 507                 if (ifi->sdl->sdl_index == ifindex)
 508                         return (ifi);
 509         }
 510         return (NULL);
 511 }
 512
 513 static int
 514 make_packet(struct ifinfo *ifi)
 515 {
 516         size_t packlen = sizeof(struct nd_router_solicit), lladdroptlen = 0;
 517         struct nd_router_solicit *rs;
 518         char *buf;
 519
 520         if ((lladdroptlen = lladdropt_length(ifi->sdl)) == 0) {
 521                 warnmsg(LOG_INFO, __func__,
 522                     "link-layer address option has null length"
 523                     " on %s. Treat as not included.", ifi->ifname);
 524         }
 525         packlen += lladdroptlen;
 526         ifi->rs_datalen = packlen;
 527
 528         /* allocate buffer */
 529         if ((buf = malloc(packlen)) == NULL) {
 530                 warnmsg(LOG_ERR, __func__,
 531                     "memory allocation failed for %s", ifi->ifname);
 532                 return (-1);
 533         }
 534         ifi->rs_data = buf;
 535
 536         /* fill in the message */
 537         rs = (struct nd_router_solicit *)buf;
 538         rs->nd_rs_type = ND_ROUTER_SOLICIT;
 539         rs->nd_rs_code = 0;
 540         rs->nd_rs_cksum = 0;
 541         rs->nd_rs_reserved = 0;
 542         buf += sizeof(*rs);
 543
 544         /* fill in source link-layer address option */
 545         if (lladdroptlen)
 546                 lladdropt_fill(ifi->sdl, (struct nd_opt_hdr *)buf);
 547
 548         return (0);
 549 }
 550
 551 static struct timespec *
 552 rtsol_check_timer(void)
 553 {
 554         static struct timespec returnval;
 555         struct timespec now, rtsol_timer;
 556         struct ifinfo *ifi;
 557         struct rainfo *rai;
 558         struct ra_opt *rao, *raotmp;
 559         int error, flags;
 560
 561         clock_gettime(CLOCK_MONOTONIC_FAST, &now);
 562
 563         rtsol_timer = tm_max;
 564
 565         TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
 566                 if (TS_CMP(&ifi->expire, &now, <=)) {
 567                         warnmsg(LOG_DEBUG, __func__, "timer expiration on %s, "
 568                             "state = %d", ifi->ifname, ifi->state);
 569
 570                         while((rai = TAILQ_FIRST(&ifi->ifi_rainfo)) != NULL) {
 571                                 /* Remove all RA options. */
 572                                 TAILQ_REMOVE(&ifi->ifi_rainfo, rai, rai_next);
 573                                 while ((rao = TAILQ_FIRST(&rai->rai_ra_opt)) !=
 574                                     NULL) {
 575                                         TAILQ_REMOVE(&rai->rai_ra_opt, rao,
 576                                             rao_next);
 577                                         if (rao->rao_msg != NULL)
 578                                                 free(rao->rao_msg);
 579                                         free(rao);
 580                                 }
 581                                 free(rai);
 582                         }
 583                         switch (ifi->state) {
 584                         case IFS_DOWN:
 585                         case IFS_TENTATIVE:
 586                                 /* interface_up returns 0 on success */
 587                                 flags = interface_up(ifi->ifname);
 588                                 if (flags == 0)
 589                                         ifi->state = IFS_DELAY;
 590                                 else if (flags == IFS_TENTATIVE)
 591                                         ifi->state = IFS_TENTATIVE;
 592                                 else
 593                                         ifi->state = IFS_DOWN;
 594                                 break;
 595                         case IFS_IDLE:
 596                         {
 597                                 int oldstatus = ifi->active;
 598                                 int probe = 0;
 599
 600                                 ifi->active = interface_status(ifi);
 601
 602                                 if (oldstatus != ifi->active) {
 603                                         warnmsg(LOG_DEBUG, __func__,
 604                                             "%s status is changed"
 605                                             " from %d to %d",
 606                                             ifi->ifname,
 607                                             oldstatus, ifi->active);
 608                                         probe = 1;
 609                                         ifi->state = IFS_DELAY;
 610                                 } else if (ifi->probeinterval &&
 611                                     (ifi->probetimer -=
 612                                     ifi->timer.tv_sec) <= 0) {
 613                                         /* probe timer expired */
 614                                         ifi->probetimer =
 615                                             ifi->probeinterval;
 616                                         probe = 1;
 617                                         ifi->state = IFS_PROBE;
 618                                 }
 619
 620                                 /*
 621                                  * If we need a probe, clear the previous
 622                                  * status wrt the "managed/other" configuration.
 623                                  */
 624                                 if (probe) {
 625                                         ifi->managedconfig = 0;
 626                                         ifi->otherconfig = 0;
 627                                         ifi->alwaysconfig = 0;
 628                                 }
 629                                 if (probe && mobile_node) {
 630                                         error = cap_probe_defrouters(capsendmsg,
 631                                             ifi);
 632                                         if (error != 0)
 633                                                 warnmsg(LOG_DEBUG, __func__,
 634                                             "failed to probe routers: %d",
 635                                                     error);
 636                                 }
 637                                 break;
 638                         }
 639                         case IFS_DELAY:
 640                                 ifi->state = IFS_PROBE;
 641                                 (void)cap_rssend(capsendmsg, ifi);
 642                                 break;
 643                         case IFS_PROBE:
 644                                 if (ifi->probes < MAX_RTR_SOLICITATIONS)
 645                                         (void)cap_rssend(capsendmsg, ifi);
 646                                 else {
 647                                         warnmsg(LOG_INFO, __func__,
 648                                             "No answer after sending %d RSs",
 649                                             ifi->probes);
 650                                         ifi->probes = 0;
 651                                         ifi->state = IFS_IDLE;
 652                                 }
 653                                 break;
 654                         }
 655                         rtsol_timer_update(ifi);
 656                 } else {
 657                         /* Expiration check for RA options. */
 658                         int expire = 0;
 659
 660                         TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next) {
 661                                 TAILQ_FOREACH_SAFE(rao, &rai->rai_ra_opt,
 662                                     rao_next, raotmp) {
 663                                         warnmsg(LOG_DEBUG, __func__,
 664                                             "RA expiration timer: "
 665                                             "type=%d, msg=%s, expire=%s",
 666                                             rao->rao_type, (char *)rao->rao_msg,
 667                                                 sec2str(&rao->rao_expire));
 668                                         if (TS_CMP(&now, &rao->rao_expire,
 669                                             >=)) {
 670                                                 warnmsg(LOG_DEBUG, __func__,
 671                                                     "RA expiration timer: "
 672                                                     "expired.");
 673                                                 TAILQ_REMOVE(&rai->rai_ra_opt,
 674                                                     rao, rao_next);
 675                                                 if (rao->rao_msg != NULL)
 676                                                         free(rao->rao_msg);
 677                                                 free(rao);
 678                                                 expire = 1;
 679                                         }
 680                                 }
 681                         }
 682                         if (expire)
 683                                 ra_opt_handler(ifi);
 684                 }
 685                 if (TS_CMP(&ifi->expire, &rtsol_timer, <))
 686                         rtsol_timer = ifi->expire;
 687         }
 688
 689         if (TS_CMP(&rtsol_timer, &tm_max, ==)) {
 690                 warnmsg(LOG_DEBUG, __func__, "there is no timer");
 691                 return (NULL);
 692         } else if (TS_CMP(&rtsol_timer, &now, <))
 693                 /* this may occur when the interval is too small */
 694                 returnval.tv_sec = returnval.tv_nsec = 0;
 695         else
 696                 TS_SUB(&rtsol_timer, &now, &returnval);
 697
 698         now.tv_sec += returnval.tv_sec;
 699         now.tv_nsec += returnval.tv_nsec;
 700         warnmsg(LOG_DEBUG, __func__, "New timer is %s",
 701             sec2str(&now));
 702
 703         return (&returnval);
 704 }
 705
 706 void
 707 rtsol_timer_update(struct ifinfo *ifi)
 708 {
 709 #define MILLION 1000000
 710 #define DADRETRY 10             /* XXX: adhoc */
 711         long interval;
 712         struct timespec now;
 713
 714         bzero(&ifi->timer, sizeof(ifi->timer));
 715
 716         switch (ifi->state) {
 717         case IFS_DOWN:
 718         case IFS_TENTATIVE:
 719                 if (++ifi->dadcount > DADRETRY) {
 720                         ifi->dadcount = 0;
 721                         ifi->timer.tv_sec = PROBE_INTERVAL;
 722                 } else
 723                         ifi->timer.tv_sec = 1;
 724                 break;
 725         case IFS_IDLE:
 726                 if (mobile_node)
 727                         /* XXX should be configurable */
 728                         ifi->timer.tv_sec = 3;
 729                 else
 730                         ifi->timer = tm_max;    /* stop timer(valid?) */
 731                 break;
 732         case IFS_DELAY:
 733                 if (no_solicitation_delay)
 734                         interval = 0;
 735                 else
 736                         interval = arc4random_uniform(MAX_RTR_SOLICITATION_DELAY * MILLION);
 737                 ifi->timer.tv_sec = interval / MILLION;
 738                 ifi->timer.tv_nsec = (interval % MILLION) * 1000;
 739                 break;
 740         case IFS_PROBE:
 741                 if (ifi->probes < MAX_RTR_SOLICITATIONS)
 742                         ifi->timer.tv_sec = RTR_SOLICITATION_INTERVAL;
 743                 else
 744                         /*
 745                          * After sending MAX_RTR_SOLICITATIONS solicitations,
 746                          * we're just waiting for possible replies; there
 747                          * will be no more solicitation.  Thus, we change
 748                          * the timer value to MAX_RTR_SOLICITATION_DELAY based
 749                          * on RFC 2461, Section 6.3.7.
 750                          */
 751                         ifi->timer.tv_sec = MAX_RTR_SOLICITATION_DELAY;
 752                 break;
 753         default:
 754                 warnmsg(LOG_ERR, __func__,
 755                     "illegal interface state(%d) on %s",
 756                     ifi->state, ifi->ifname);
 757                 return;
 758         }
 759
 760         /* reset the timer */
 761         if (TS_CMP(&ifi->timer, &tm_max, ==)) {
 762                 ifi->expire = tm_max;
 763                 warnmsg(LOG_DEBUG, __func__,
 764                     "stop timer for %s", ifi->ifname);
 765         } else {
 766                 clock_gettime(CLOCK_MONOTONIC_FAST, &now);
 767                 TS_ADD(&now, &ifi->timer, &ifi->expire);
 768
 769                 now.tv_sec += ifi->timer.tv_sec;
 770                 now.tv_nsec += ifi->timer.tv_nsec;
 771                 warnmsg(LOG_DEBUG, __func__, "set timer for %s to %s",
 772                     ifi->ifname, sec2str(&now));
 773         }
 774
 775 #undef MILLION
 776 }
 777
 778 static void
 779 set_dumpfile(int sig __unused)
 780 {
 781
 782         do_dump = 1;
 783 }
 784
 785 static void
 786 set_exit(int sig __unused)
 787 {
 788
 789         do_exit = 1;
 790 }
 791
 792 static void
 793 usage(const char *progname)
 794 {
 795
 796         if (strcmp(progname, "rtsold") == 0) {
 797                 fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] "
 798                     "[-M script-name ] [-A script-name ] "
 799                     "[-p pidfile] [-R script-name] interface ...\n");
 800                 fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] "
 801                     "[-M script-name ] [-A script-name ] "
 802                     "[-p pidfile] [-R script-name] -a\n");
 803         } else {
 804                 fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
 805                     "[-M script-name ] [-A script-name ] "
 806                     "[-p pidfile] [-R script-name] interface ...\n");
 807                 fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
 808                     "[-M script-name ] [-A script-name ] "
 809                     "[-p pidfile] [-R script-name] -a\n");
 810         }
 811         exit(1);
 812 }
 813
 814 void
 815 warnmsg(int priority, const char *func, const char *msg, ...)
 816 {
 817         va_list ap;
 818         char buf[BUFSIZ];
 819
 820         va_start(ap, msg);
 821         if (fflag) {
 822                 if (priority <= log_upto)
 823                         vwarnx(msg, ap);
 824         } else {
 825                 snprintf(buf, sizeof(buf), "<%s> %s", func, msg);
 826                 msg = buf;
 827                 cap_vsyslog(capsyslog, priority, msg, ap);
 828         }
 829         va_end(ap);
 830 }
 831
 832 /*
 833  * return a list of interfaces which is suitable to sending an RS.
 834  */
 835 static char **
 836 autoifprobe(void)
 837 {
 838         static char **argv = NULL;
 839         static int n = 0;
 840         char **a;
 841         int s = 0, i, found;
 842         struct ifaddrs *ifap, *ifa;
 843         struct in6_ndireq nd;
 844
 845         /* initialize */
 846         while (n--)
 847                 free(argv[n]);
 848         if (argv) {
 849                 free(argv);
 850                 argv = NULL;
 851         }
 852         n = 0;
 853
 854         if (getifaddrs(&ifap) != 0)
 855                 return (NULL);
 856
 857         if (!Fflag && (s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 858                 warnmsg(LOG_ERR, __func__, "socket");
 859                 exit(1);
 860         }
 861
 862         /* find an ethernet */
 863         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 864                 if ((ifa->ifa_flags & IFF_UP) == 0)
 865                         continue;
 866                 if ((ifa->ifa_flags & IFF_LOOPBACK) != 0)
 867                         continue;
 868                 if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
 869                         continue;
 870
 871                 if (ifa->ifa_addr->sa_family != AF_INET6)
 872                         continue;
 873
 874                 found = 0;
 875                 for (i = 0; i < n; i++) {
 876                         if (strcmp(argv[i], ifa->ifa_name) == 0) {
 877                                 found++;
 878                                 break;
 879                         }
 880                 }
 881                 if (found)
 882                         continue;
 883
 884                 /*
 885                  * Skip the interfaces which IPv6 and/or accepting RA
 886                  * is disabled.
 887                  */
 888                 if (!Fflag) {
 889                         memset(&nd, 0, sizeof(nd));
 890                         strlcpy(nd.ifname, ifa->ifa_name, sizeof(nd.ifname));
 891                         if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
 892                                 warnmsg(LOG_ERR, __func__,
 893                                         "ioctl(SIOCGIFINFO_IN6)");
 894                                 exit(1);
 895                         }
 896                         if ((nd.ndi.flags & ND6_IFF_IFDISABLED))
 897                                 continue;
 898                         if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV))
 899                                 continue;
 900                 }
 901
 902                 /* if we find multiple candidates, just warn. */
 903                 if (n != 0 && dflag > 1)
 904                         warnmsg(LOG_WARNING, __func__,
 905                                 "multiple interfaces found");
 906
 907                 a = realloc(argv, (n + 1) * sizeof(char *));
 908                 if (a == NULL) {
 909                         warnmsg(LOG_ERR, __func__, "realloc");
 910                         exit(1);
 911                 }
 912                 argv = a;
 913                 argv[n] = strdup(ifa->ifa_name);
 914                 if (!argv[n]) {
 915                         warnmsg(LOG_ERR, __func__, "malloc");
 916                         exit(1);
 917                 }
 918                 n++;
 919         }
 920
 921         if (n) {
 922                 a = realloc(argv, (n + 1) * sizeof(char *));
 923                 if (a == NULL) {
 924                         warnmsg(LOG_ERR, __func__, "realloc");
 925                         exit(1);
 926                 }
 927                 argv = a;
 928                 argv[n] = NULL;
 929
 930                 if (dflag > 0) {
 931                         for (i = 0; i < n; i++)
 932                                 warnmsg(LOG_WARNING, __func__, "probing %s",
 933                                         argv[i]);
 934                 }
 935         }
 936         if (!Fflag)
 937                 close(s);
 938         freeifaddrs(ifap);
 939         return (argv);
 940 }