1 /* $KAME: rtsold.c,v 1.67 2003/05/17 18:16:15 itojun Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $FreeBSD$ 34 */ 35 36 #include <sys/param.h> 37 #include <sys/capsicum.h> 38 #include <sys/event.h> 39 #include <sys/ioctl.h> 40 #include <sys/socket.h> 41 42 #include <net/if.h> 43 #include <net/if_dl.h> 44 45 #include <netinet/in.h> 46 #include <netinet/icmp6.h> 47 #include <netinet/in_var.h> 48 #include <arpa/inet.h> 49 50 #include <netinet6/nd6.h> 51 52 #include <capsicum_helpers.h> 53 #include <err.h> 54 #include <errno.h> 55 #include <ifaddrs.h> 56 #include <libgen.h> 57 #include <signal.h> 58 #include <stdarg.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <syslog.h> 63 #include <time.h> 64 #include <unistd.h> 65 66 #include <libcasper.h> 67 #include <casper/cap_syslog.h> 68 #include <libutil.h> 69 70 #include "rtsold.h" 71 72 #define RTSOL_DUMPFILE "/var/run/rtsold.dump" 73 74 struct timespec tm_max; 75 static int log_upto = 999; 76 static int fflag = 0; 77 78 int Fflag = 0; /* force setting sysctl parameters */ 79 int aflag = 0; 80 int dflag = 0; 81 int uflag = 0; 82 83 const char *managedconf_script; 84 const char *otherconf_script; 85 const char *resolvconf_script = "/sbin/resolvconf"; 86 87 cap_channel_t *capllflags, *capscript, *capsendmsg, *capsyslog; 88 89 /* protocol constants */ 90 #define MAX_RTR_SOLICITATION_DELAY 1 /* second */ 91 #define RTR_SOLICITATION_INTERVAL 4 /* seconds */ 92 #define MAX_RTR_SOLICITATIONS 3 /* times */ 93 94 /* 95 * implementation dependent constants in seconds 96 * XXX: should be configurable 97 */ 98 #define PROBE_INTERVAL 60 99 100 /* static variables and functions */ 101 static int mobile_node = 0; 102 103 static sig_atomic_t do_dump, do_exit; 104 static struct pidfh *pfh; 105 106 static char **autoifprobe(void); 107 static int ifconfig(char *ifname); 108 static int init_capabilities(void); 109 static int make_packet(struct ifinfo *); 110 static struct timespec *rtsol_check_timer(void); 111 112 static void set_dumpfile(int); 113 static void set_exit(int); 114 static void usage(const char *progname); 115 116 int 117 main(int argc, char **argv) 118 { 119 struct kevent events[2]; 120 FILE *dumpfp; 121 struct ifinfo *ifi; 122 struct timespec *timeout; 123 const char *opts, *pidfilepath, *progname; 124 int ch, error, kq, once, rcvsock, rtsock; 125 126 progname = basename(argv[0]); 127 if (strcmp(progname, "rtsold") == 0) { 128 opts = "adDfFm1M:O:p:R:u"; 129 once = 0; 130 pidfilepath = NULL; 131 } else { 132 opts = "adDFM:O:R:u"; 133 fflag = 1; 134 once = 1; 135 } 136 137 while ((ch = getopt(argc, argv, opts)) != -1) { 138 switch (ch) { 139 case 'a': 140 aflag = 1; 141 break; 142 case 'd': 143 dflag += 1; 144 break; 145 case 'D': 146 dflag += 2; 147 break; 148 case 'f': 149 fflag = 1; 150 break; 151 case 'F': 152 Fflag = 1; 153 break; 154 case 'm': 155 mobile_node = 1; 156 break; 157 case '1': 158 once = 1; 159 break; 160 case 'M': 161 managedconf_script = optarg; 162 break; 163 case 'O': 164 otherconf_script = optarg; 165 break; 166 case 'p': 167 pidfilepath = optarg; 168 break; 169 case 'R': 170 resolvconf_script = optarg; 171 break; 172 case 'u': 173 uflag = 1; 174 break; 175 default: 176 usage(progname); 177 } 178 } 179 argc -= optind; 180 argv += optind; 181 182 if ((!aflag && argc == 0) || (aflag && argc != 0)) 183 usage(progname); 184 185 /* Generate maximum time in timespec. */ 186 tm_max.tv_sec = (-1) & ~((time_t)1 << ((sizeof(tm_max.tv_sec) * 8) - 1)); 187 tm_max.tv_nsec = (-1) & ~((long)1 << ((sizeof(tm_max.tv_nsec) * 8) - 1)); 188 189 /* set log level */ 190 if (dflag > 1) 191 log_upto = LOG_DEBUG; 192 else if (dflag > 0) 193 log_upto = LOG_INFO; 194 else 195 log_upto = LOG_NOTICE; 196 197 if (managedconf_script != NULL && *managedconf_script != '/') 198 errx(1, "configuration script (%s) must be an absolute path", 199 managedconf_script); 200 if (otherconf_script != NULL && *otherconf_script != '/') 201 errx(1, "configuration script (%s) must be an absolute path", 202 otherconf_script); 203 if (*resolvconf_script != '/') 204 errx(1, "configuration script (%s) must be an absolute path", 205 resolvconf_script); 206 207 if (!fflag) { 208 pfh = pidfile_open(pidfilepath, 0644, NULL); 209 if (pfh == NULL) 210 errx(1, "failed to open pidfile: %s", strerror(errno)); 211 if (daemon(0, 0) != 0) 212 errx(1, "failed to daemonize"); 213 } 214 215 if ((error = init_capabilities()) != 0) 216 err(1, "failed to initialize capabilities"); 217 218 if (!fflag) { 219 cap_openlog(capsyslog, progname, LOG_NDELAY | LOG_PID, 220 LOG_DAEMON); 221 if (log_upto >= 0) 222 (void)cap_setlogmask(capsyslog, LOG_UPTO(log_upto)); 223 (void)signal(SIGTERM, set_exit); 224 (void)signal(SIGINT, set_exit); 225 (void)signal(SIGUSR1, set_dumpfile); 226 dumpfp = rtsold_init_dumpfile(RTSOL_DUMPFILE); 227 } else 228 dumpfp = NULL; 229 230 kq = kqueue(); 231 if (kq < 0) { 232 warnmsg(LOG_ERR, __func__, "failed to create a kqueue: %s", 233 strerror(errno)); 234 exit(1); 235 } 236 237 /* Open global sockets and register for read events. */ 238 if ((rtsock = rtsock_open()) < 0) { 239 warnmsg(LOG_ERR, __func__, "failed to open routing socket"); 240 exit(1); 241 } 242 if ((rcvsock = recvsockopen()) < 0) { 243 warnmsg(LOG_ERR, __func__, "failed to open receive socket"); 244 exit(1); 245 } 246 EV_SET(&events[0], rtsock, EVFILT_READ, EV_ADD, 0, 0, NULL); 247 EV_SET(&events[1], rcvsock, EVFILT_READ, EV_ADD, 0, 0, NULL); 248 if (kevent(kq, events, 2, NULL, 0, NULL) < 0) { 249 warnmsg(LOG_ERR, __func__, "kevent(): %s", strerror(errno)); 250 exit(1); 251 } 252 253 /* Probe network interfaces and set up tracking info. */ 254 if (ifinit() != 0) { 255 warnmsg(LOG_ERR, __func__, "failed to initialize interfaces"); 256 exit(1); 257 } 258 if (aflag) 259 argv = autoifprobe(); 260 while (argv && *argv) { 261 if (ifconfig(*argv)) { 262 warnmsg(LOG_ERR, __func__, 263 "failed to initialize %s", *argv); 264 exit(1); 265 } 266 argv++; 267 } 268 269 /* Write to our pidfile. */ 270 if (pfh != NULL && pidfile_write(pfh) != 0) { 271 warnmsg(LOG_ERR, __func__, 272 "failed to open pidfile: %s", strerror(errno)); 273 exit(1); 274 } 275 276 /* Enter capability mode. */ 277 caph_cache_catpages(); 278 if (caph_enter_casper() != 0) { 279 warnmsg(LOG_ERR, __func__, "caph_enter(): %s", strerror(errno)); 280 exit(1); 281 } 282 283 for (;;) { 284 if (do_exit) { 285 /* Handle SIGTERM, SIGINT. */ 286 if (pfh != NULL) 287 pidfile_remove(pfh); 288 break; 289 } 290 if (do_dump) { 291 /* Handle SIGUSR1. */ 292 do_dump = 0; 293 if (dumpfp != NULL) 294 rtsold_dump(dumpfp); 295 } 296 297 timeout = rtsol_check_timer(); 298 299 if (once) { 300 /* if we have no timeout, we are done (or failed) */ 301 if (timeout == NULL) 302 break; 303 304 /* if all interfaces have got RA packet, we are done */ 305 TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) { 306 if (ifi->state != IFS_DOWN && ifi->racnt == 0) 307 break; 308 } 309 if (ifi == NULL) 310 break; 311 } 312 313 error = kevent(kq, NULL, 0, &events[0], 1, timeout); 314 if (error < 1) { 315 if (error < 0 && errno != EINTR) 316 warnmsg(LOG_ERR, __func__, "kevent(): %s", 317 strerror(errno)); 318 continue; 319 } 320 321 if (events[0].ident == (uintptr_t)rtsock) 322 rtsock_input(rtsock); 323 else 324 rtsol_input(rcvsock); 325 } 326 327 return (0); 328 } 329 330 static int 331 init_capabilities(void) 332 { 333 #ifdef WITH_CASPER 334 const char *const scripts[] = 335 { resolvconf_script, managedconf_script, otherconf_script }; 336 cap_channel_t *capcasper; 337 nvlist_t *limits; 338 339 capcasper = cap_init(); 340 if (capcasper == NULL) 341 return (-1); 342 343 capllflags = cap_service_open(capcasper, "rtsold.llflags"); 344 if (capllflags == NULL) 345 return (-1); 346 347 capscript = cap_service_open(capcasper, "rtsold.script"); 348 if (capscript == NULL) 349 return (-1); 350 limits = nvlist_create(0); 351 for (size_t i = 0; i < nitems(scripts); i++) 352 if (scripts[i] != NULL) 353 nvlist_append_string_array(limits, "scripts", 354 scripts[i]); 355 if (cap_limit_set(capscript, limits) != 0) 356 return (-1); 357 358 capsendmsg = cap_service_open(capcasper, "rtsold.sendmsg"); 359 if (capsendmsg == NULL) 360 return (-1); 361 362 if (!fflag) { 363 capsyslog = cap_service_open(capcasper, "system.syslog"); 364 if (capsyslog == NULL) 365 return (-1); 366 } 367 368 cap_close(capcasper); 369 #endif /* WITH_CASPER */ 370 return (0); 371 } 372 373 static int 374 ifconfig(char *ifname) 375 { 376 struct ifinfo *ifi; 377 struct sockaddr_dl *sdl; 378 int flags; 379 380 ifi = NULL; 381 if ((sdl = if_nametosdl(ifname)) == NULL) { 382 warnmsg(LOG_ERR, __func__, 383 "failed to get link layer information for %s", ifname); 384 goto bad; 385 } 386 if (find_ifinfo(sdl->sdl_index)) { 387 warnmsg(LOG_ERR, __func__, 388 "interface %s was already configured", ifname); 389 goto bad; 390 } 391 392 if (Fflag) { 393 struct in6_ndireq nd; 394 int s; 395 396 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 397 warnmsg(LOG_ERR, __func__, "socket() failed."); 398 goto bad; 399 } 400 memset(&nd, 0, sizeof(nd)); 401 strlcpy(nd.ifname, ifname, sizeof(nd.ifname)); 402 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) { 403 warnmsg(LOG_ERR, __func__, 404 "cannot get accept_rtadv flag"); 405 (void)close(s); 406 goto bad; 407 } 408 nd.ndi.flags |= ND6_IFF_ACCEPT_RTADV; 409 if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd) < 0) { 410 warnmsg(LOG_ERR, __func__, 411 "cannot set accept_rtadv flag"); 412 (void)close(s); 413 goto bad; 414 } 415 (void)close(s); 416 } 417 418 if ((ifi = malloc(sizeof(*ifi))) == NULL) { 419 warnmsg(LOG_ERR, __func__, "memory allocation failed"); 420 goto bad; 421 } 422 memset(ifi, 0, sizeof(*ifi)); 423 ifi->sdl = sdl; 424 ifi->ifi_rdnss = IFI_DNSOPT_STATE_NOINFO; 425 ifi->ifi_dnssl = IFI_DNSOPT_STATE_NOINFO; 426 TAILQ_INIT(&ifi->ifi_rainfo); 427 strlcpy(ifi->ifname, ifname, sizeof(ifi->ifname)); 428 429 /* construct a router solicitation message */ 430 if (make_packet(ifi)) 431 goto bad; 432 433 /* set link ID of this interface. */ 434 #ifdef HAVE_SCOPELIB 435 if (inet_zoneid(AF_INET6, 2, ifname, &ifi->linkid)) 436 goto bad; 437 #else 438 /* XXX: assume interface IDs as link IDs */ 439 ifi->linkid = ifi->sdl->sdl_index; 440 #endif 441 442 /* 443 * check if the interface is available. 444 * also check if SIOCGIFMEDIA ioctl is OK on the interface. 445 */ 446 ifi->mediareqok = 1; 447 ifi->active = interface_status(ifi); 448 if (!ifi->mediareqok) { 449 /* 450 * probe routers periodically even if the link status 451 * does not change. 452 */ 453 ifi->probeinterval = PROBE_INTERVAL; 454 } 455 456 /* activate interface: interface_up returns 0 on success */ 457 flags = interface_up(ifi->ifname); 458 if (flags == 0) 459 ifi->state = IFS_DELAY; 460 else if (flags == IFS_TENTATIVE) 461 ifi->state = IFS_TENTATIVE; 462 else 463 ifi->state = IFS_DOWN; 464 465 rtsol_timer_update(ifi); 466 467 TAILQ_INSERT_TAIL(&ifinfo_head, ifi, ifi_next); 468 return (0); 469 470 bad: 471 free(sdl); 472 free(ifi); 473 return (-1); 474 } 475 476 struct rainfo * 477 find_rainfo(struct ifinfo *ifi, struct sockaddr_in6 *sin6) 478 { 479 struct rainfo *rai; 480 481 TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next) 482 if (memcmp(&rai->rai_saddr.sin6_addr, &sin6->sin6_addr, 483 sizeof(rai->rai_saddr.sin6_addr)) == 0) 484 return (rai); 485 486 return (NULL); 487 } 488 489 struct ifinfo * 490 find_ifinfo(int ifindex) 491 { 492 struct ifinfo *ifi; 493 494 TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) { 495 if (ifi->sdl->sdl_index == ifindex) 496 return (ifi); 497 } 498 return (NULL); 499 } 500 501 static int 502 make_packet(struct ifinfo *ifi) 503 { 504 size_t packlen = sizeof(struct nd_router_solicit), lladdroptlen = 0; 505 struct nd_router_solicit *rs; 506 char *buf; 507 508 if ((lladdroptlen = lladdropt_length(ifi->sdl)) == 0) { 509 warnmsg(LOG_INFO, __func__, 510 "link-layer address option has null length" 511 " on %s. Treat as not included.", ifi->ifname); 512 } 513 packlen += lladdroptlen; 514 ifi->rs_datalen = packlen; 515 516 /* allocate buffer */ 517 if ((buf = malloc(packlen)) == NULL) { 518 warnmsg(LOG_ERR, __func__, 519 "memory allocation failed for %s", ifi->ifname); 520 return (-1); 521 } 522 ifi->rs_data = buf; 523 524 /* fill in the message */ 525 rs = (struct nd_router_solicit *)buf; 526 rs->nd_rs_type = ND_ROUTER_SOLICIT; 527 rs->nd_rs_code = 0; 528 rs->nd_rs_cksum = 0; 529 rs->nd_rs_reserved = 0; 530 buf += sizeof(*rs); 531 532 /* fill in source link-layer address option */ 533 if (lladdroptlen) 534 lladdropt_fill(ifi->sdl, (struct nd_opt_hdr *)buf); 535 536 return (0); 537 } 538 539 static struct timespec * 540 rtsol_check_timer(void) 541 { 542 static struct timespec returnval; 543 struct timespec now, rtsol_timer; 544 struct ifinfo *ifi; 545 struct rainfo *rai; 546 struct ra_opt *rao, *raotmp; 547 int error, flags; 548 549 clock_gettime(CLOCK_MONOTONIC_FAST, &now); 550 551 rtsol_timer = tm_max; 552 553 TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) { 554 if (TS_CMP(&ifi->expire, &now, <=)) { 555 warnmsg(LOG_DEBUG, __func__, "timer expiration on %s, " 556 "state = %d", ifi->ifname, ifi->state); 557 558 while((rai = TAILQ_FIRST(&ifi->ifi_rainfo)) != NULL) { 559 /* Remove all RA options. */ 560 TAILQ_REMOVE(&ifi->ifi_rainfo, rai, rai_next); 561 while ((rao = TAILQ_FIRST(&rai->rai_ra_opt)) != 562 NULL) { 563 TAILQ_REMOVE(&rai->rai_ra_opt, rao, 564 rao_next); 565 if (rao->rao_msg != NULL) 566 free(rao->rao_msg); 567 free(rao); 568 } 569 free(rai); 570 } 571 switch (ifi->state) { 572 case IFS_DOWN: 573 case IFS_TENTATIVE: 574 /* interface_up returns 0 on success */ 575 flags = interface_up(ifi->ifname); 576 if (flags == 0) 577 ifi->state = IFS_DELAY; 578 else if (flags == IFS_TENTATIVE) 579 ifi->state = IFS_TENTATIVE; 580 else 581 ifi->state = IFS_DOWN; 582 break; 583 case IFS_IDLE: 584 { 585 int oldstatus = ifi->active; 586 int probe = 0; 587 588 ifi->active = interface_status(ifi); 589 590 if (oldstatus != ifi->active) { 591 warnmsg(LOG_DEBUG, __func__, 592 "%s status is changed" 593 " from %d to %d", 594 ifi->ifname, 595 oldstatus, ifi->active); 596 probe = 1; 597 ifi->state = IFS_DELAY; 598 } else if (ifi->probeinterval && 599 (ifi->probetimer -= 600 ifi->timer.tv_sec) <= 0) { 601 /* probe timer expired */ 602 ifi->probetimer = 603 ifi->probeinterval; 604 probe = 1; 605 ifi->state = IFS_PROBE; 606 } 607 608 /* 609 * If we need a probe, clear the previous 610 * status wrt the "managed/other" configuration. 611 */ 612 if (probe) { 613 ifi->managedconfig = 0; 614 ifi->otherconfig = 0; 615 } 616 if (probe && mobile_node) { 617 error = cap_probe_defrouters(capsendmsg, 618 ifi); 619 if (error != 0) 620 warnmsg(LOG_DEBUG, __func__, 621 "failed to probe routers: %d", 622 error); 623 } 624 break; 625 } 626 case IFS_DELAY: 627 ifi->state = IFS_PROBE; 628 (void)cap_rssend(capsendmsg, ifi); 629 break; 630 case IFS_PROBE: 631 if (ifi->probes < MAX_RTR_SOLICITATIONS) 632 (void)cap_rssend(capsendmsg, ifi); 633 else { 634 warnmsg(LOG_INFO, __func__, 635 "No answer after sending %d RSs", 636 ifi->probes); 637 ifi->probes = 0; 638 ifi->state = IFS_IDLE; 639 } 640 break; 641 } 642 rtsol_timer_update(ifi); 643 } else { 644 /* Expiration check for RA options. */ 645 int expire = 0; 646 647 TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next) { 648 TAILQ_FOREACH_SAFE(rao, &rai->rai_ra_opt, 649 rao_next, raotmp) { 650 warnmsg(LOG_DEBUG, __func__, 651 "RA expiration timer: " 652 "type=%d, msg=%s, expire=%s", 653 rao->rao_type, (char *)rao->rao_msg, 654 sec2str(&rao->rao_expire)); 655 if (TS_CMP(&now, &rao->rao_expire, 656 >=)) { 657 warnmsg(LOG_DEBUG, __func__, 658 "RA expiration timer: " 659 "expired."); 660 TAILQ_REMOVE(&rai->rai_ra_opt, 661 rao, rao_next); 662 if (rao->rao_msg != NULL) 663 free(rao->rao_msg); 664 free(rao); 665 expire = 1; 666 } 667 } 668 } 669 if (expire) 670 ra_opt_handler(ifi); 671 } 672 if (TS_CMP(&ifi->expire, &rtsol_timer, <)) 673 rtsol_timer = ifi->expire; 674 } 675 676 if (TS_CMP(&rtsol_timer, &tm_max, ==)) { 677 warnmsg(LOG_DEBUG, __func__, "there is no timer"); 678 return (NULL); 679 } else if (TS_CMP(&rtsol_timer, &now, <)) 680 /* this may occur when the interval is too small */ 681 returnval.tv_sec = returnval.tv_nsec = 0; 682 else 683 TS_SUB(&rtsol_timer, &now, &returnval); 684 685 now.tv_sec += returnval.tv_sec; 686 now.tv_nsec += returnval.tv_nsec; 687 warnmsg(LOG_DEBUG, __func__, "New timer is %s", 688 sec2str(&now)); 689 690 return (&returnval); 691 } 692 693 void 694 rtsol_timer_update(struct ifinfo *ifi) 695 { 696 #define MILLION 1000000 697 #define DADRETRY 10 /* XXX: adhoc */ 698 long interval; 699 struct timespec now; 700 701 bzero(&ifi->timer, sizeof(ifi->timer)); 702 703 switch (ifi->state) { 704 case IFS_DOWN: 705 case IFS_TENTATIVE: 706 if (++ifi->dadcount > DADRETRY) { 707 ifi->dadcount = 0; 708 ifi->timer.tv_sec = PROBE_INTERVAL; 709 } else 710 ifi->timer.tv_sec = 1; 711 break; 712 case IFS_IDLE: 713 if (mobile_node) 714 /* XXX should be configurable */ 715 ifi->timer.tv_sec = 3; 716 else 717 ifi->timer = tm_max; /* stop timer(valid?) */ 718 break; 719 case IFS_DELAY: 720 interval = arc4random_uniform(MAX_RTR_SOLICITATION_DELAY * MILLION); 721 ifi->timer.tv_sec = interval / MILLION; 722 ifi->timer.tv_nsec = (interval % MILLION) * 1000; 723 break; 724 case IFS_PROBE: 725 if (ifi->probes < MAX_RTR_SOLICITATIONS) 726 ifi->timer.tv_sec = RTR_SOLICITATION_INTERVAL; 727 else 728 /* 729 * After sending MAX_RTR_SOLICITATIONS solicitations, 730 * we're just waiting for possible replies; there 731 * will be no more solicitation. Thus, we change 732 * the timer value to MAX_RTR_SOLICITATION_DELAY based 733 * on RFC 2461, Section 6.3.7. 734 */ 735 ifi->timer.tv_sec = MAX_RTR_SOLICITATION_DELAY; 736 break; 737 default: 738 warnmsg(LOG_ERR, __func__, 739 "illegal interface state(%d) on %s", 740 ifi->state, ifi->ifname); 741 return; 742 } 743 744 /* reset the timer */ 745 if (TS_CMP(&ifi->timer, &tm_max, ==)) { 746 ifi->expire = tm_max; 747 warnmsg(LOG_DEBUG, __func__, 748 "stop timer for %s", ifi->ifname); 749 } else { 750 clock_gettime(CLOCK_MONOTONIC_FAST, &now); 751 TS_ADD(&now, &ifi->timer, &ifi->expire); 752 753 now.tv_sec += ifi->timer.tv_sec; 754 now.tv_nsec += ifi->timer.tv_nsec; 755 warnmsg(LOG_DEBUG, __func__, "set timer for %s to %s", 756 ifi->ifname, sec2str(&now)); 757 } 758 759 #undef MILLION 760 } 761 762 static void 763 set_dumpfile(int sig __unused) 764 { 765 766 do_dump = 1; 767 } 768 769 static void 770 set_exit(int sig __unused) 771 { 772 773 do_exit = 1; 774 } 775 776 static void 777 usage(const char *progname) 778 { 779 780 if (strcmp(progname, "rtsold") == 0) { 781 fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] " 782 "[-p pidfile] [-R script-name] interface ...\n"); 783 fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] " 784 "[-p pidfile] [-R script-name] -a\n"); 785 } else { 786 fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] " 787 "[-p pidfile] [-R script-name] interface ...\n"); 788 fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] " 789 "[-p pidfile] [-R script-name] -a\n"); 790 } 791 exit(1); 792 } 793 794 void 795 warnmsg(int priority, const char *func, const char *msg, ...) 796 { 797 va_list ap; 798 char buf[BUFSIZ]; 799 800 va_start(ap, msg); 801 if (fflag) { 802 if (priority <= log_upto) 803 vwarnx(msg, ap); 804 } else { 805 snprintf(buf, sizeof(buf), "<%s> %s", func, msg); 806 msg = buf; 807 cap_vsyslog(capsyslog, priority, msg, ap); 808 } 809 va_end(ap); 810 } 811 812 /* 813 * return a list of interfaces which is suitable to sending an RS. 814 */ 815 static char ** 816 autoifprobe(void) 817 { 818 static char **argv = NULL; 819 static int n = 0; 820 char **a; 821 int s = 0, i, found; 822 struct ifaddrs *ifap, *ifa; 823 struct in6_ndireq nd; 824 825 /* initialize */ 826 while (n--) 827 free(argv[n]); 828 if (argv) { 829 free(argv); 830 argv = NULL; 831 } 832 n = 0; 833 834 if (getifaddrs(&ifap) != 0) 835 return (NULL); 836 837 if (!Fflag && (s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 838 warnmsg(LOG_ERR, __func__, "socket"); 839 exit(1); 840 } 841 842 /* find an ethernet */ 843 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 844 if ((ifa->ifa_flags & IFF_UP) == 0) 845 continue; 846 if ((ifa->ifa_flags & IFF_POINTOPOINT) != 0) 847 continue; 848 if ((ifa->ifa_flags & IFF_LOOPBACK) != 0) 849 continue; 850 if ((ifa->ifa_flags & IFF_MULTICAST) == 0) 851 continue; 852 853 if (ifa->ifa_addr->sa_family != AF_INET6) 854 continue; 855 856 found = 0; 857 for (i = 0; i < n; i++) { 858 if (strcmp(argv[i], ifa->ifa_name) == 0) { 859 found++; 860 break; 861 } 862 } 863 if (found) 864 continue; 865 866 /* 867 * Skip the interfaces which IPv6 and/or accepting RA 868 * is disabled. 869 */ 870 if (!Fflag) { 871 memset(&nd, 0, sizeof(nd)); 872 strlcpy(nd.ifname, ifa->ifa_name, sizeof(nd.ifname)); 873 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) { 874 warnmsg(LOG_ERR, __func__, 875 "ioctl(SIOCGIFINFO_IN6)"); 876 exit(1); 877 } 878 if ((nd.ndi.flags & ND6_IFF_IFDISABLED)) 879 continue; 880 if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV)) 881 continue; 882 } 883 884 /* if we find multiple candidates, just warn. */ 885 if (n != 0 && dflag > 1) 886 warnmsg(LOG_WARNING, __func__, 887 "multiple interfaces found"); 888 889 a = realloc(argv, (n + 1) * sizeof(char *)); 890 if (a == NULL) { 891 warnmsg(LOG_ERR, __func__, "realloc"); 892 exit(1); 893 } 894 argv = a; 895 argv[n] = strdup(ifa->ifa_name); 896 if (!argv[n]) { 897 warnmsg(LOG_ERR, __func__, "malloc"); 898 exit(1); 899 } 900 n++; 901 } 902 903 if (n) { 904 a = realloc(argv, (n + 1) * sizeof(char *)); 905 if (a == NULL) { 906 warnmsg(LOG_ERR, __func__, "realloc"); 907 exit(1); 908 } 909 argv = a; 910 argv[n] = NULL; 911 912 if (dflag > 0) { 913 for (i = 0; i < n; i++) 914 warnmsg(LOG_WARNING, __func__, "probing %s", 915 argv[i]); 916 } 917 } 918 if (!Fflag) 919 close(s); 920 freeifaddrs(ifap); 921 return (argv); 922 } 923