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 int count; 339 340 capcasper = cap_init(); 341 if (capcasper == NULL) 342 return (-1); 343 344 capllflags = cap_service_open(capcasper, "rtsold.llflags"); 345 if (capllflags == NULL) 346 return (-1); 347 348 capscript = cap_service_open(capcasper, "rtsold.script"); 349 if (capscript == NULL) 350 return (-1); 351 count = 0; 352 for (size_t i = 0; i < nitems(scripts); i++) 353 if (scripts[i] != NULL) 354 count++; 355 limits = nvlist_create(0); 356 nvlist_add_string_array(limits, "scripts", scripts, count); 357 if (cap_limit_set(capscript, limits) != 0) 358 return (-1); 359 360 capsendmsg = cap_service_open(capcasper, "rtsold.sendmsg"); 361 if (capsendmsg == NULL) 362 return (-1); 363 364 if (!fflag) { 365 capsyslog = cap_service_open(capcasper, "system.syslog"); 366 if (capsyslog == NULL) 367 return (-1); 368 } 369 370 cap_close(capcasper); 371 #endif /* WITH_CASPER */ 372 return (0); 373 } 374 375 static int 376 ifconfig(char *ifname) 377 { 378 struct ifinfo *ifi; 379 struct sockaddr_dl *sdl; 380 int flags; 381 382 ifi = NULL; 383 if ((sdl = if_nametosdl(ifname)) == NULL) { 384 warnmsg(LOG_ERR, __func__, 385 "failed to get link layer information for %s", ifname); 386 goto bad; 387 } 388 if (find_ifinfo(sdl->sdl_index)) { 389 warnmsg(LOG_ERR, __func__, 390 "interface %s was already configured", ifname); 391 goto bad; 392 } 393 394 if (Fflag) { 395 struct in6_ndireq nd; 396 int s; 397 398 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 399 warnmsg(LOG_ERR, __func__, "socket() failed."); 400 goto bad; 401 } 402 memset(&nd, 0, sizeof(nd)); 403 strlcpy(nd.ifname, ifname, sizeof(nd.ifname)); 404 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) { 405 warnmsg(LOG_ERR, __func__, 406 "cannot get accept_rtadv flag"); 407 (void)close(s); 408 goto bad; 409 } 410 nd.ndi.flags |= ND6_IFF_ACCEPT_RTADV; 411 if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd) < 0) { 412 warnmsg(LOG_ERR, __func__, 413 "cannot set accept_rtadv flag"); 414 (void)close(s); 415 goto bad; 416 } 417 (void)close(s); 418 } 419 420 if ((ifi = malloc(sizeof(*ifi))) == NULL) { 421 warnmsg(LOG_ERR, __func__, "memory allocation failed"); 422 goto bad; 423 } 424 memset(ifi, 0, sizeof(*ifi)); 425 ifi->sdl = sdl; 426 ifi->ifi_rdnss = IFI_DNSOPT_STATE_NOINFO; 427 ifi->ifi_dnssl = IFI_DNSOPT_STATE_NOINFO; 428 TAILQ_INIT(&ifi->ifi_rainfo); 429 strlcpy(ifi->ifname, ifname, sizeof(ifi->ifname)); 430 431 /* construct a router solicitation message */ 432 if (make_packet(ifi)) 433 goto bad; 434 435 /* set link ID of this interface. */ 436 #ifdef HAVE_SCOPELIB 437 if (inet_zoneid(AF_INET6, 2, ifname, &ifi->linkid)) 438 goto bad; 439 #else 440 /* XXX: assume interface IDs as link IDs */ 441 ifi->linkid = ifi->sdl->sdl_index; 442 #endif 443 444 /* 445 * check if the interface is available. 446 * also check if SIOCGIFMEDIA ioctl is OK on the interface. 447 */ 448 ifi->mediareqok = 1; 449 ifi->active = interface_status(ifi); 450 if (!ifi->mediareqok) { 451 /* 452 * probe routers periodically even if the link status 453 * does not change. 454 */ 455 ifi->probeinterval = PROBE_INTERVAL; 456 } 457 458 /* activate interface: interface_up returns 0 on success */ 459 flags = interface_up(ifi->ifname); 460 if (flags == 0) 461 ifi->state = IFS_DELAY; 462 else if (flags == IFS_TENTATIVE) 463 ifi->state = IFS_TENTATIVE; 464 else 465 ifi->state = IFS_DOWN; 466 467 rtsol_timer_update(ifi); 468 469 TAILQ_INSERT_TAIL(&ifinfo_head, ifi, ifi_next); 470 return (0); 471 472 bad: 473 free(sdl); 474 free(ifi); 475 return (-1); 476 } 477 478 struct rainfo * 479 find_rainfo(struct ifinfo *ifi, struct sockaddr_in6 *sin6) 480 { 481 struct rainfo *rai; 482 483 TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next) 484 if (memcmp(&rai->rai_saddr.sin6_addr, &sin6->sin6_addr, 485 sizeof(rai->rai_saddr.sin6_addr)) == 0) 486 return (rai); 487 488 return (NULL); 489 } 490 491 struct ifinfo * 492 find_ifinfo(int ifindex) 493 { 494 struct ifinfo *ifi; 495 496 TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) { 497 if (ifi->sdl->sdl_index == ifindex) 498 return (ifi); 499 } 500 return (NULL); 501 } 502 503 static int 504 make_packet(struct ifinfo *ifi) 505 { 506 size_t packlen = sizeof(struct nd_router_solicit), lladdroptlen = 0; 507 struct nd_router_solicit *rs; 508 char *buf; 509 510 if ((lladdroptlen = lladdropt_length(ifi->sdl)) == 0) { 511 warnmsg(LOG_INFO, __func__, 512 "link-layer address option has null length" 513 " on %s. Treat as not included.", ifi->ifname); 514 } 515 packlen += lladdroptlen; 516 ifi->rs_datalen = packlen; 517 518 /* allocate buffer */ 519 if ((buf = malloc(packlen)) == NULL) { 520 warnmsg(LOG_ERR, __func__, 521 "memory allocation failed for %s", ifi->ifname); 522 return (-1); 523 } 524 ifi->rs_data = buf; 525 526 /* fill in the message */ 527 rs = (struct nd_router_solicit *)buf; 528 rs->nd_rs_type = ND_ROUTER_SOLICIT; 529 rs->nd_rs_code = 0; 530 rs->nd_rs_cksum = 0; 531 rs->nd_rs_reserved = 0; 532 buf += sizeof(*rs); 533 534 /* fill in source link-layer address option */ 535 if (lladdroptlen) 536 lladdropt_fill(ifi->sdl, (struct nd_opt_hdr *)buf); 537 538 return (0); 539 } 540 541 static struct timespec * 542 rtsol_check_timer(void) 543 { 544 static struct timespec returnval; 545 struct timespec now, rtsol_timer; 546 struct ifinfo *ifi; 547 struct rainfo *rai; 548 struct ra_opt *rao, *raotmp; 549 int error, flags; 550 551 clock_gettime(CLOCK_MONOTONIC_FAST, &now); 552 553 rtsol_timer = tm_max; 554 555 TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) { 556 if (TS_CMP(&ifi->expire, &now, <=)) { 557 warnmsg(LOG_DEBUG, __func__, "timer expiration on %s, " 558 "state = %d", ifi->ifname, ifi->state); 559 560 while((rai = TAILQ_FIRST(&ifi->ifi_rainfo)) != NULL) { 561 /* Remove all RA options. */ 562 TAILQ_REMOVE(&ifi->ifi_rainfo, rai, rai_next); 563 while ((rao = TAILQ_FIRST(&rai->rai_ra_opt)) != 564 NULL) { 565 TAILQ_REMOVE(&rai->rai_ra_opt, rao, 566 rao_next); 567 if (rao->rao_msg != NULL) 568 free(rao->rao_msg); 569 free(rao); 570 } 571 free(rai); 572 } 573 switch (ifi->state) { 574 case IFS_DOWN: 575 case IFS_TENTATIVE: 576 /* interface_up returns 0 on success */ 577 flags = interface_up(ifi->ifname); 578 if (flags == 0) 579 ifi->state = IFS_DELAY; 580 else if (flags == IFS_TENTATIVE) 581 ifi->state = IFS_TENTATIVE; 582 else 583 ifi->state = IFS_DOWN; 584 break; 585 case IFS_IDLE: 586 { 587 int oldstatus = ifi->active; 588 int probe = 0; 589 590 ifi->active = interface_status(ifi); 591 592 if (oldstatus != ifi->active) { 593 warnmsg(LOG_DEBUG, __func__, 594 "%s status is changed" 595 " from %d to %d", 596 ifi->ifname, 597 oldstatus, ifi->active); 598 probe = 1; 599 ifi->state = IFS_DELAY; 600 } else if (ifi->probeinterval && 601 (ifi->probetimer -= 602 ifi->timer.tv_sec) <= 0) { 603 /* probe timer expired */ 604 ifi->probetimer = 605 ifi->probeinterval; 606 probe = 1; 607 ifi->state = IFS_PROBE; 608 } 609 610 /* 611 * If we need a probe, clear the previous 612 * status wrt the "managed/other" configuration. 613 */ 614 if (probe) { 615 ifi->managedconfig = 0; 616 ifi->otherconfig = 0; 617 } 618 if (probe && mobile_node) { 619 error = cap_probe_defrouters(capsendmsg, 620 ifi); 621 if (error != 0) 622 warnmsg(LOG_DEBUG, __func__, 623 "failed to probe routers: %d", 624 error); 625 } 626 break; 627 } 628 case IFS_DELAY: 629 ifi->state = IFS_PROBE; 630 (void)cap_rssend(capsendmsg, ifi); 631 break; 632 case IFS_PROBE: 633 if (ifi->probes < MAX_RTR_SOLICITATIONS) 634 (void)cap_rssend(capsendmsg, ifi); 635 else { 636 warnmsg(LOG_INFO, __func__, 637 "No answer after sending %d RSs", 638 ifi->probes); 639 ifi->probes = 0; 640 ifi->state = IFS_IDLE; 641 } 642 break; 643 } 644 rtsol_timer_update(ifi); 645 } else { 646 /* Expiration check for RA options. */ 647 int expire = 0; 648 649 TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next) { 650 TAILQ_FOREACH_SAFE(rao, &rai->rai_ra_opt, 651 rao_next, raotmp) { 652 warnmsg(LOG_DEBUG, __func__, 653 "RA expiration timer: " 654 "type=%d, msg=%s, expire=%s", 655 rao->rao_type, (char *)rao->rao_msg, 656 sec2str(&rao->rao_expire)); 657 if (TS_CMP(&now, &rao->rao_expire, 658 >=)) { 659 warnmsg(LOG_DEBUG, __func__, 660 "RA expiration timer: " 661 "expired."); 662 TAILQ_REMOVE(&rai->rai_ra_opt, 663 rao, rao_next); 664 if (rao->rao_msg != NULL) 665 free(rao->rao_msg); 666 free(rao); 667 expire = 1; 668 } 669 } 670 } 671 if (expire) 672 ra_opt_handler(ifi); 673 } 674 if (TS_CMP(&ifi->expire, &rtsol_timer, <)) 675 rtsol_timer = ifi->expire; 676 } 677 678 if (TS_CMP(&rtsol_timer, &tm_max, ==)) { 679 warnmsg(LOG_DEBUG, __func__, "there is no timer"); 680 return (NULL); 681 } else if (TS_CMP(&rtsol_timer, &now, <)) 682 /* this may occur when the interval is too small */ 683 returnval.tv_sec = returnval.tv_nsec = 0; 684 else 685 TS_SUB(&rtsol_timer, &now, &returnval); 686 687 now.tv_sec += returnval.tv_sec; 688 now.tv_nsec += returnval.tv_nsec; 689 warnmsg(LOG_DEBUG, __func__, "New timer is %s", 690 sec2str(&now)); 691 692 return (&returnval); 693 } 694 695 void 696 rtsol_timer_update(struct ifinfo *ifi) 697 { 698 #define MILLION 1000000 699 #define DADRETRY 10 /* XXX: adhoc */ 700 long interval; 701 struct timespec now; 702 703 bzero(&ifi->timer, sizeof(ifi->timer)); 704 705 switch (ifi->state) { 706 case IFS_DOWN: 707 case IFS_TENTATIVE: 708 if (++ifi->dadcount > DADRETRY) { 709 ifi->dadcount = 0; 710 ifi->timer.tv_sec = PROBE_INTERVAL; 711 } else 712 ifi->timer.tv_sec = 1; 713 break; 714 case IFS_IDLE: 715 if (mobile_node) 716 /* XXX should be configurable */ 717 ifi->timer.tv_sec = 3; 718 else 719 ifi->timer = tm_max; /* stop timer(valid?) */ 720 break; 721 case IFS_DELAY: 722 interval = arc4random_uniform(MAX_RTR_SOLICITATION_DELAY * MILLION); 723 ifi->timer.tv_sec = interval / MILLION; 724 ifi->timer.tv_nsec = (interval % MILLION) * 1000; 725 break; 726 case IFS_PROBE: 727 if (ifi->probes < MAX_RTR_SOLICITATIONS) 728 ifi->timer.tv_sec = RTR_SOLICITATION_INTERVAL; 729 else 730 /* 731 * After sending MAX_RTR_SOLICITATIONS solicitations, 732 * we're just waiting for possible replies; there 733 * will be no more solicitation. Thus, we change 734 * the timer value to MAX_RTR_SOLICITATION_DELAY based 735 * on RFC 2461, Section 6.3.7. 736 */ 737 ifi->timer.tv_sec = MAX_RTR_SOLICITATION_DELAY; 738 break; 739 default: 740 warnmsg(LOG_ERR, __func__, 741 "illegal interface state(%d) on %s", 742 ifi->state, ifi->ifname); 743 return; 744 } 745 746 /* reset the timer */ 747 if (TS_CMP(&ifi->timer, &tm_max, ==)) { 748 ifi->expire = tm_max; 749 warnmsg(LOG_DEBUG, __func__, 750 "stop timer for %s", ifi->ifname); 751 } else { 752 clock_gettime(CLOCK_MONOTONIC_FAST, &now); 753 TS_ADD(&now, &ifi->timer, &ifi->expire); 754 755 now.tv_sec += ifi->timer.tv_sec; 756 now.tv_nsec += ifi->timer.tv_nsec; 757 warnmsg(LOG_DEBUG, __func__, "set timer for %s to %s", 758 ifi->ifname, sec2str(&now)); 759 } 760 761 #undef MILLION 762 } 763 764 static void 765 set_dumpfile(int sig __unused) 766 { 767 768 do_dump = 1; 769 } 770 771 static void 772 set_exit(int sig __unused) 773 { 774 775 do_exit = 1; 776 } 777 778 static void 779 usage(const char *progname) 780 { 781 782 if (strcmp(progname, "rtsold") == 0) { 783 fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] " 784 "[-p pidfile] [-R script-name] interface ...\n"); 785 fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] " 786 "[-p pidfile] [-R script-name] -a\n"); 787 } else { 788 fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] " 789 "[-p pidfile] [-R script-name] interface ...\n"); 790 fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] " 791 "[-p pidfile] [-R script-name] -a\n"); 792 } 793 exit(1); 794 } 795 796 void 797 warnmsg(int priority, const char *func, const char *msg, ...) 798 { 799 va_list ap; 800 char buf[BUFSIZ]; 801 802 va_start(ap, msg); 803 if (fflag) { 804 if (priority <= log_upto) 805 vwarnx(msg, ap); 806 } else { 807 snprintf(buf, sizeof(buf), "<%s> %s", func, msg); 808 msg = buf; 809 cap_vsyslog(capsyslog, priority, msg, ap); 810 } 811 va_end(ap); 812 } 813 814 /* 815 * return a list of interfaces which is suitable to sending an RS. 816 */ 817 static char ** 818 autoifprobe(void) 819 { 820 static char **argv = NULL; 821 static int n = 0; 822 char **a; 823 int s = 0, i, found; 824 struct ifaddrs *ifap, *ifa; 825 struct in6_ndireq nd; 826 827 /* initialize */ 828 while (n--) 829 free(argv[n]); 830 if (argv) { 831 free(argv); 832 argv = NULL; 833 } 834 n = 0; 835 836 if (getifaddrs(&ifap) != 0) 837 return (NULL); 838 839 if (!Fflag && (s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 840 warnmsg(LOG_ERR, __func__, "socket"); 841 exit(1); 842 } 843 844 /* find an ethernet */ 845 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 846 if ((ifa->ifa_flags & IFF_UP) == 0) 847 continue; 848 if ((ifa->ifa_flags & IFF_POINTOPOINT) != 0) 849 continue; 850 if ((ifa->ifa_flags & IFF_LOOPBACK) != 0) 851 continue; 852 if ((ifa->ifa_flags & IFF_MULTICAST) == 0) 853 continue; 854 855 if (ifa->ifa_addr->sa_family != AF_INET6) 856 continue; 857 858 found = 0; 859 for (i = 0; i < n; i++) { 860 if (strcmp(argv[i], ifa->ifa_name) == 0) { 861 found++; 862 break; 863 } 864 } 865 if (found) 866 continue; 867 868 /* 869 * Skip the interfaces which IPv6 and/or accepting RA 870 * is disabled. 871 */ 872 if (!Fflag) { 873 memset(&nd, 0, sizeof(nd)); 874 strlcpy(nd.ifname, ifa->ifa_name, sizeof(nd.ifname)); 875 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) { 876 warnmsg(LOG_ERR, __func__, 877 "ioctl(SIOCGIFINFO_IN6)"); 878 exit(1); 879 } 880 if ((nd.ndi.flags & ND6_IFF_IFDISABLED)) 881 continue; 882 if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV)) 883 continue; 884 } 885 886 /* if we find multiple candidates, just warn. */ 887 if (n != 0 && dflag > 1) 888 warnmsg(LOG_WARNING, __func__, 889 "multiple interfaces found"); 890 891 a = realloc(argv, (n + 1) * sizeof(char *)); 892 if (a == NULL) { 893 warnmsg(LOG_ERR, __func__, "realloc"); 894 exit(1); 895 } 896 argv = a; 897 argv[n] = strdup(ifa->ifa_name); 898 if (!argv[n]) { 899 warnmsg(LOG_ERR, __func__, "malloc"); 900 exit(1); 901 } 902 n++; 903 } 904 905 if (n) { 906 a = realloc(argv, (n + 1) * sizeof(char *)); 907 if (a == NULL) { 908 warnmsg(LOG_ERR, __func__, "realloc"); 909 exit(1); 910 } 911 argv = a; 912 argv[n] = NULL; 913 914 if (dflag > 0) { 915 for (i = 0; i < n; i++) 916 warnmsg(LOG_WARNING, __func__, "probing %s", 917 argv[i]); 918 } 919 } 920 if (!Fflag) 921 close(s); 922 freeifaddrs(ifap); 923 return (argv); 924 } 925