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/ioctl.h> 38 #include <sys/socket.h> 39 40 #include <net/if.h> 41 #include <net/if_dl.h> 42 43 #include <netinet/in.h> 44 #include <netinet/icmp6.h> 45 #include <netinet/in_var.h> 46 #include <arpa/inet.h> 47 48 #include <netinet6/nd6.h> 49 50 #include <signal.h> 51 #include <unistd.h> 52 #include <syslog.h> 53 #include <string.h> 54 #include <stdlib.h> 55 #include <stdio.h> 56 #include <time.h> 57 #include <errno.h> 58 #include <err.h> 59 #include <stdarg.h> 60 #include <ifaddrs.h> 61 #include <poll.h> 62 63 #include "rtsold.h" 64 65 #define RTSOL_DUMPFILE "/var/run/rtsold.dump"; 66 #define RTSOL_PIDFILE "/var/run/rtsold.pid"; 67 68 struct timespec tm_max; 69 static int log_upto = 999; 70 static int fflag = 0; 71 72 int Fflag = 0; /* force setting sysctl parameters */ 73 int aflag = 0; 74 int dflag = 0; 75 int uflag = 0; 76 77 const char *otherconf_script; 78 const char *resolvconf_script = "/sbin/resolvconf"; 79 80 /* protocol constants */ 81 #define MAX_RTR_SOLICITATION_DELAY 1 /* second */ 82 #define RTR_SOLICITATION_INTERVAL 4 /* seconds */ 83 #define MAX_RTR_SOLICITATIONS 3 /* times */ 84 85 /* 86 * implementation dependent constants in seconds 87 * XXX: should be configurable 88 */ 89 #define PROBE_INTERVAL 60 90 91 /* static variables and functions */ 92 static int mobile_node = 0; 93 static const char *pidfilename = RTSOL_PIDFILE; 94 95 #ifndef SMALL 96 static int do_dump; 97 static const char *dumpfilename = RTSOL_DUMPFILE; 98 #endif 99 100 static char **autoifprobe(void); 101 static int ifconfig(char *ifname); 102 static int make_packet(struct ifinfo *); 103 static struct timespec *rtsol_check_timer(void); 104 105 #ifndef SMALL 106 static void rtsold_set_dump_file(int); 107 #endif 108 static void usage(void); 109 110 int 111 main(int argc, char **argv) 112 { 113 int s, ch, once = 0; 114 struct timespec *timeout; 115 const char *opts; 116 struct pollfd set[2]; 117 int rtsock; 118 char *argv0; 119 120 #ifndef SMALL 121 /* rtsold */ 122 opts = "adDfFm1O:p:R:u"; 123 #else 124 /* rtsol */ 125 opts = "adDFO:R:u"; 126 fflag = 1; 127 once = 1; 128 #endif 129 argv0 = argv[0]; 130 131 while ((ch = getopt(argc, argv, opts)) != -1) { 132 switch (ch) { 133 case 'a': 134 aflag = 1; 135 break; 136 case 'd': 137 dflag += 1; 138 break; 139 case 'D': 140 dflag += 2; 141 break; 142 case 'f': 143 fflag = 1; 144 break; 145 case 'F': 146 Fflag = 1; 147 break; 148 case 'm': 149 mobile_node = 1; 150 break; 151 case '1': 152 once = 1; 153 break; 154 case 'O': 155 otherconf_script = optarg; 156 break; 157 case 'p': 158 pidfilename = optarg; 159 break; 160 case 'R': 161 resolvconf_script = optarg; 162 break; 163 case 'u': 164 uflag = 1; 165 break; 166 default: 167 usage(); 168 exit(1); 169 } 170 } 171 argc -= optind; 172 argv += optind; 173 174 if ((!aflag && argc == 0) || (aflag && argc != 0)) { 175 usage(); 176 exit(1); 177 } 178 179 /* Generate maximum time in timespec. */ 180 tm_max.tv_sec = (-1) & ~((time_t)1 << ((sizeof(tm_max.tv_sec) * 8) - 1)); 181 tm_max.tv_nsec = (-1) & ~((long)1 << ((sizeof(tm_max.tv_nsec) * 8) - 1)); 182 183 /* set log level */ 184 if (dflag > 1) 185 log_upto = LOG_DEBUG; 186 else if (dflag > 0) 187 log_upto = LOG_INFO; 188 else 189 log_upto = LOG_NOTICE; 190 191 if (!fflag) { 192 char *ident; 193 194 ident = strrchr(argv0, '/'); 195 if (!ident) 196 ident = argv0; 197 else 198 ident++; 199 openlog(ident, LOG_NDELAY|LOG_PID, LOG_DAEMON); 200 if (log_upto >= 0) 201 setlogmask(LOG_UPTO(log_upto)); 202 } 203 204 if (otherconf_script && *otherconf_script != '/') { 205 errx(1, "configuration script (%s) must be an absolute path", 206 otherconf_script); 207 } 208 if (resolvconf_script && *resolvconf_script != '/') { 209 errx(1, "configuration script (%s) must be an absolute path", 210 resolvconf_script); 211 } 212 if (pidfilename && *pidfilename != '/') { 213 errx(1, "pid filename (%s) must be an absolute path", 214 pidfilename); 215 } 216 217 #ifndef SMALL 218 /* initialization to dump internal status to a file */ 219 signal(SIGUSR1, rtsold_set_dump_file); 220 #endif 221 222 if (!fflag) 223 daemon(0, 0); /* act as a daemon */ 224 225 /* 226 * Open a socket for sending RS and receiving RA. 227 * This should be done before calling ifinit(), since the function 228 * uses the socket. 229 */ 230 if ((s = sockopen()) < 0) { 231 warnmsg(LOG_ERR, __func__, "failed to open a socket"); 232 exit(1); 233 } 234 set[0].fd = s; 235 set[0].events = POLLIN; 236 set[1].fd = -1; 237 238 if ((rtsock = rtsock_open()) < 0) { 239 warnmsg(LOG_ERR, __func__, "failed to open a socket"); 240 exit(1); 241 } 242 set[1].fd = rtsock; 243 set[1].events = POLLIN; 244 245 /* configuration per interface */ 246 if (ifinit()) { 247 warnmsg(LOG_ERR, __func__, 248 "failed to initialize interfaces"); 249 exit(1); 250 } 251 if (aflag) 252 argv = autoifprobe(); 253 while (argv && *argv) { 254 if (ifconfig(*argv)) { 255 warnmsg(LOG_ERR, __func__, 256 "failed to initialize %s", *argv); 257 exit(1); 258 } 259 argv++; 260 } 261 262 /* setup for probing default routers */ 263 if (probe_init()) { 264 warnmsg(LOG_ERR, __func__, 265 "failed to setup for probing routers"); 266 exit(1); 267 /*NOTREACHED*/ 268 } 269 270 /* dump the current pid */ 271 if (!once) { 272 pid_t pid = getpid(); 273 FILE *fp; 274 275 if ((fp = fopen(pidfilename, "w")) == NULL) 276 warnmsg(LOG_ERR, __func__, 277 "failed to open a pid log file(%s): %s", 278 pidfilename, strerror(errno)); 279 else { 280 fprintf(fp, "%d\n", pid); 281 fclose(fp); 282 } 283 } 284 while (1) { /* main loop */ 285 int e; 286 #ifndef SMALL 287 if (do_dump) { /* SIGUSR1 */ 288 do_dump = 0; 289 rtsold_dump_file(dumpfilename); 290 } 291 #endif 292 293 timeout = rtsol_check_timer(); 294 295 if (once) { 296 struct ifinfo *ifi; 297 298 /* if we have no timeout, we are done (or failed) */ 299 if (timeout == NULL) 300 break; 301 302 /* if all interfaces have got RA packet, we are done */ 303 TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) { 304 if (ifi->state != IFS_DOWN && ifi->racnt == 0) 305 break; 306 } 307 if (ifi == NULL) 308 break; 309 } 310 e = poll(set, 2, timeout ? (timeout->tv_sec * 1000 + timeout->tv_nsec / 1000 / 1000) : INFTIM); 311 if (e < 1) { 312 if (e < 0 && errno != EINTR) { 313 warnmsg(LOG_ERR, __func__, "select: %s", 314 strerror(errno)); 315 } 316 continue; 317 } 318 319 /* packet reception */ 320 if (set[1].revents & POLLIN) 321 rtsock_input(rtsock); 322 if (set[0].revents & POLLIN) 323 rtsol_input(s); 324 } 325 /* NOTREACHED */ 326 327 return (0); 328 } 329 330 static int 331 ifconfig(char *ifname) 332 { 333 struct ifinfo *ifi; 334 struct sockaddr_dl *sdl; 335 int flags; 336 337 if ((sdl = if_nametosdl(ifname)) == NULL) { 338 warnmsg(LOG_ERR, __func__, 339 "failed to get link layer information for %s", ifname); 340 return (-1); 341 } 342 if (find_ifinfo(sdl->sdl_index)) { 343 warnmsg(LOG_ERR, __func__, 344 "interface %s was already configured", ifname); 345 free(sdl); 346 return (-1); 347 } 348 349 if (Fflag) { 350 struct in6_ndireq nd; 351 int s; 352 353 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 354 warnmsg(LOG_ERR, __func__, "socket() failed."); 355 return (-1); 356 } 357 memset(&nd, 0, sizeof(nd)); 358 strlcpy(nd.ifname, ifname, sizeof(nd.ifname)); 359 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) { 360 warnmsg(LOG_ERR, __func__, 361 "cannot get accept_rtadv flag"); 362 close(s); 363 return (-1); 364 } 365 nd.ndi.flags |= ND6_IFF_ACCEPT_RTADV; 366 if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd) < 0) { 367 warnmsg(LOG_ERR, __func__, 368 "cannot set accept_rtadv flag"); 369 close(s); 370 return (-1); 371 } 372 close(s); 373 } 374 375 if ((ifi = malloc(sizeof(*ifi))) == NULL) { 376 warnmsg(LOG_ERR, __func__, "memory allocation failed"); 377 free(sdl); 378 return (-1); 379 } 380 memset(ifi, 0, sizeof(*ifi)); 381 ifi->sdl = sdl; 382 ifi->ifi_rdnss = IFI_DNSOPT_STATE_NOINFO; 383 ifi->ifi_dnssl = IFI_DNSOPT_STATE_NOINFO; 384 TAILQ_INIT(&ifi->ifi_rainfo); 385 strlcpy(ifi->ifname, ifname, sizeof(ifi->ifname)); 386 387 /* construct a router solicitation message */ 388 if (make_packet(ifi)) 389 goto bad; 390 391 /* set link ID of this interface. */ 392 #ifdef HAVE_SCOPELIB 393 if (inet_zoneid(AF_INET6, 2, ifname, &ifi->linkid)) 394 goto bad; 395 #else 396 /* XXX: assume interface IDs as link IDs */ 397 ifi->linkid = ifi->sdl->sdl_index; 398 #endif 399 400 /* 401 * check if the interface is available. 402 * also check if SIOCGIFMEDIA ioctl is OK on the interface. 403 */ 404 ifi->mediareqok = 1; 405 ifi->active = interface_status(ifi); 406 if (!ifi->mediareqok) { 407 /* 408 * probe routers periodically even if the link status 409 * does not change. 410 */ 411 ifi->probeinterval = PROBE_INTERVAL; 412 } 413 414 /* activate interface: interface_up returns 0 on success */ 415 flags = interface_up(ifi->ifname); 416 if (flags == 0) 417 ifi->state = IFS_DELAY; 418 else if (flags == IFS_TENTATIVE) 419 ifi->state = IFS_TENTATIVE; 420 else 421 ifi->state = IFS_DOWN; 422 423 rtsol_timer_update(ifi); 424 425 TAILQ_INSERT_TAIL(&ifinfo_head, ifi, ifi_next); 426 return (0); 427 428 bad: 429 free(ifi->sdl); 430 free(ifi); 431 return (-1); 432 } 433 434 struct rainfo * 435 find_rainfo(struct ifinfo *ifi, struct sockaddr_in6 *sin6) 436 { 437 struct rainfo *rai; 438 439 TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next) 440 if (memcmp(&rai->rai_saddr.sin6_addr, &sin6->sin6_addr, 441 sizeof(rai->rai_saddr.sin6_addr)) == 0) 442 return (rai); 443 444 return (NULL); 445 } 446 447 struct ifinfo * 448 find_ifinfo(int ifindex) 449 { 450 struct ifinfo *ifi; 451 452 TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) { 453 if (ifi->sdl->sdl_index == ifindex) 454 return (ifi); 455 } 456 return (NULL); 457 } 458 459 static int 460 make_packet(struct ifinfo *ifi) 461 { 462 size_t packlen = sizeof(struct nd_router_solicit), lladdroptlen = 0; 463 struct nd_router_solicit *rs; 464 char *buf; 465 466 if ((lladdroptlen = lladdropt_length(ifi->sdl)) == 0) { 467 warnmsg(LOG_INFO, __func__, 468 "link-layer address option has null length" 469 " on %s. Treat as not included.", ifi->ifname); 470 } 471 packlen += lladdroptlen; 472 ifi->rs_datalen = packlen; 473 474 /* allocate buffer */ 475 if ((buf = malloc(packlen)) == NULL) { 476 warnmsg(LOG_ERR, __func__, 477 "memory allocation failed for %s", ifi->ifname); 478 return (-1); 479 } 480 ifi->rs_data = buf; 481 482 /* fill in the message */ 483 rs = (struct nd_router_solicit *)buf; 484 rs->nd_rs_type = ND_ROUTER_SOLICIT; 485 rs->nd_rs_code = 0; 486 rs->nd_rs_cksum = 0; 487 rs->nd_rs_reserved = 0; 488 buf += sizeof(*rs); 489 490 /* fill in source link-layer address option */ 491 if (lladdroptlen) 492 lladdropt_fill(ifi->sdl, (struct nd_opt_hdr *)buf); 493 494 return (0); 495 } 496 497 static struct timespec * 498 rtsol_check_timer(void) 499 { 500 static struct timespec returnval; 501 struct timespec now, rtsol_timer; 502 struct ifinfo *ifi; 503 struct rainfo *rai; 504 struct ra_opt *rao, *raotmp; 505 int flags; 506 507 clock_gettime(CLOCK_MONOTONIC_FAST, &now); 508 509 rtsol_timer = tm_max; 510 511 TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) { 512 if (TS_CMP(&ifi->expire, &now, <=)) { 513 warnmsg(LOG_DEBUG, __func__, "timer expiration on %s, " 514 "state = %d", ifi->ifname, ifi->state); 515 516 while((rai = TAILQ_FIRST(&ifi->ifi_rainfo)) != NULL) { 517 /* Remove all RA options. */ 518 TAILQ_REMOVE(&ifi->ifi_rainfo, rai, rai_next); 519 while ((rao = TAILQ_FIRST(&rai->rai_ra_opt)) != 520 NULL) { 521 TAILQ_REMOVE(&rai->rai_ra_opt, rao, 522 rao_next); 523 if (rao->rao_msg != NULL) 524 free(rao->rao_msg); 525 free(rao); 526 } 527 free(rai); 528 } 529 switch (ifi->state) { 530 case IFS_DOWN: 531 case IFS_TENTATIVE: 532 /* interface_up returns 0 on success */ 533 flags = interface_up(ifi->ifname); 534 if (flags == 0) 535 ifi->state = IFS_DELAY; 536 else if (flags == IFS_TENTATIVE) 537 ifi->state = IFS_TENTATIVE; 538 else 539 ifi->state = IFS_DOWN; 540 break; 541 case IFS_IDLE: 542 { 543 int oldstatus = ifi->active; 544 int probe = 0; 545 546 ifi->active = interface_status(ifi); 547 548 if (oldstatus != ifi->active) { 549 warnmsg(LOG_DEBUG, __func__, 550 "%s status is changed" 551 " from %d to %d", 552 ifi->ifname, 553 oldstatus, ifi->active); 554 probe = 1; 555 ifi->state = IFS_DELAY; 556 } else if (ifi->probeinterval && 557 (ifi->probetimer -= 558 ifi->timer.tv_sec) <= 0) { 559 /* probe timer expired */ 560 ifi->probetimer = 561 ifi->probeinterval; 562 probe = 1; 563 ifi->state = IFS_PROBE; 564 } 565 566 /* 567 * If we need a probe, clear the previous 568 * status wrt the "other" configuration. 569 */ 570 if (probe) 571 ifi->otherconfig = 0; 572 573 if (probe && mobile_node) 574 defrouter_probe(ifi); 575 break; 576 } 577 case IFS_DELAY: 578 ifi->state = IFS_PROBE; 579 sendpacket(ifi); 580 break; 581 case IFS_PROBE: 582 if (ifi->probes < MAX_RTR_SOLICITATIONS) 583 sendpacket(ifi); 584 else { 585 warnmsg(LOG_INFO, __func__, 586 "No answer after sending %d RSs", 587 ifi->probes); 588 ifi->probes = 0; 589 ifi->state = IFS_IDLE; 590 } 591 break; 592 } 593 rtsol_timer_update(ifi); 594 } else { 595 /* Expiration check for RA options. */ 596 int expire = 0; 597 598 TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next) { 599 TAILQ_FOREACH_SAFE(rao, &rai->rai_ra_opt, 600 rao_next, raotmp) { 601 warnmsg(LOG_DEBUG, __func__, 602 "RA expiration timer: " 603 "type=%d, msg=%s, expire=%s", 604 rao->rao_type, (char *)rao->rao_msg, 605 sec2str(&rao->rao_expire)); 606 if (TS_CMP(&now, &rao->rao_expire, 607 >=)) { 608 warnmsg(LOG_DEBUG, __func__, 609 "RA expiration timer: " 610 "expired."); 611 TAILQ_REMOVE(&rai->rai_ra_opt, 612 rao, rao_next); 613 if (rao->rao_msg != NULL) 614 free(rao->rao_msg); 615 free(rao); 616 expire = 1; 617 } 618 } 619 } 620 if (expire) 621 ra_opt_handler(ifi); 622 } 623 if (TS_CMP(&ifi->expire, &rtsol_timer, <)) 624 rtsol_timer = ifi->expire; 625 } 626 627 if (TS_CMP(&rtsol_timer, &tm_max, ==)) { 628 warnmsg(LOG_DEBUG, __func__, "there is no timer"); 629 return (NULL); 630 } else if (TS_CMP(&rtsol_timer, &now, <)) 631 /* this may occur when the interval is too small */ 632 returnval.tv_sec = returnval.tv_nsec = 0; 633 else 634 TS_SUB(&rtsol_timer, &now, &returnval); 635 636 now.tv_sec += returnval.tv_sec; 637 now.tv_nsec += returnval.tv_nsec; 638 warnmsg(LOG_DEBUG, __func__, "New timer is %s", 639 sec2str(&now)); 640 641 return (&returnval); 642 } 643 644 void 645 rtsol_timer_update(struct ifinfo *ifi) 646 { 647 #define MILLION 1000000 648 #define DADRETRY 10 /* XXX: adhoc */ 649 long interval; 650 struct timespec now; 651 652 bzero(&ifi->timer, sizeof(ifi->timer)); 653 654 switch (ifi->state) { 655 case IFS_DOWN: 656 case IFS_TENTATIVE: 657 if (++ifi->dadcount > DADRETRY) { 658 ifi->dadcount = 0; 659 ifi->timer.tv_sec = PROBE_INTERVAL; 660 } else 661 ifi->timer.tv_sec = 1; 662 break; 663 case IFS_IDLE: 664 if (mobile_node) { 665 /* XXX should be configurable */ 666 ifi->timer.tv_sec = 3; 667 } 668 else 669 ifi->timer = tm_max; /* stop timer(valid?) */ 670 break; 671 case IFS_DELAY: 672 interval = arc4random_uniform(MAX_RTR_SOLICITATION_DELAY * MILLION); 673 ifi->timer.tv_sec = interval / MILLION; 674 ifi->timer.tv_nsec = (interval % MILLION) * 1000; 675 break; 676 case IFS_PROBE: 677 if (ifi->probes < MAX_RTR_SOLICITATIONS) 678 ifi->timer.tv_sec = RTR_SOLICITATION_INTERVAL; 679 else { 680 /* 681 * After sending MAX_RTR_SOLICITATIONS solicitations, 682 * we're just waiting for possible replies; there 683 * will be no more solicitation. Thus, we change 684 * the timer value to MAX_RTR_SOLICITATION_DELAY based 685 * on RFC 2461, Section 6.3.7. 686 */ 687 ifi->timer.tv_sec = MAX_RTR_SOLICITATION_DELAY; 688 } 689 break; 690 default: 691 warnmsg(LOG_ERR, __func__, 692 "illegal interface state(%d) on %s", 693 ifi->state, ifi->ifname); 694 return; 695 } 696 697 /* reset the timer */ 698 if (TS_CMP(&ifi->timer, &tm_max, ==)) { 699 ifi->expire = tm_max; 700 warnmsg(LOG_DEBUG, __func__, 701 "stop timer for %s", ifi->ifname); 702 } else { 703 clock_gettime(CLOCK_MONOTONIC_FAST, &now); 704 TS_ADD(&now, &ifi->timer, &ifi->expire); 705 706 now.tv_sec += ifi->timer.tv_sec; 707 now.tv_nsec += ifi->timer.tv_nsec; 708 warnmsg(LOG_DEBUG, __func__, "set timer for %s to %s", 709 ifi->ifname, sec2str(&now)); 710 } 711 712 #undef MILLION 713 } 714 715 #ifndef SMALL 716 static void 717 rtsold_set_dump_file(int sig __unused) 718 { 719 do_dump = 1; 720 } 721 #endif 722 723 static void 724 usage(void) 725 { 726 #ifndef SMALL 727 fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] " 728 "[-p pidfile] [-R script-name] interface ...\n"); 729 fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] " 730 "[-p pidfile] [-R script-name] -a\n"); 731 #else 732 fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] " 733 "[-p pidfile] [-R script-name] interface ...\n"); 734 fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] " 735 "[-p pidfile] [-R script-name] -a\n"); 736 #endif 737 } 738 739 void 740 warnmsg(int priority, const char *func, const char *msg, ...) 741 { 742 va_list ap; 743 char buf[BUFSIZ]; 744 745 va_start(ap, msg); 746 if (fflag) { 747 if (priority <= log_upto) { 748 (void)vfprintf(stderr, msg, ap); 749 (void)fprintf(stderr, "\n"); 750 } 751 } else { 752 snprintf(buf, sizeof(buf), "<%s> %s", func, msg); 753 msg = buf; 754 vsyslog(priority, msg, ap); 755 } 756 va_end(ap); 757 } 758 759 /* 760 * return a list of interfaces which is suitable to sending an RS. 761 */ 762 static char ** 763 autoifprobe(void) 764 { 765 static char **argv = NULL; 766 static int n = 0; 767 char **a; 768 int s = 0, i, found; 769 struct ifaddrs *ifap, *ifa; 770 struct in6_ndireq nd; 771 772 /* initialize */ 773 while (n--) 774 free(argv[n]); 775 if (argv) { 776 free(argv); 777 argv = NULL; 778 } 779 n = 0; 780 781 if (getifaddrs(&ifap) != 0) 782 return (NULL); 783 784 if (!Fflag && (s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 785 warnmsg(LOG_ERR, __func__, "socket"); 786 exit(1); 787 } 788 789 /* find an ethernet */ 790 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 791 if ((ifa->ifa_flags & IFF_UP) == 0) 792 continue; 793 if ((ifa->ifa_flags & IFF_POINTOPOINT) != 0) 794 continue; 795 if ((ifa->ifa_flags & IFF_LOOPBACK) != 0) 796 continue; 797 if ((ifa->ifa_flags & IFF_MULTICAST) == 0) 798 continue; 799 800 if (ifa->ifa_addr->sa_family != AF_INET6) 801 continue; 802 803 found = 0; 804 for (i = 0; i < n; i++) { 805 if (strcmp(argv[i], ifa->ifa_name) == 0) { 806 found++; 807 break; 808 } 809 } 810 if (found) 811 continue; 812 813 /* 814 * Skip the interfaces which IPv6 and/or accepting RA 815 * is disabled. 816 */ 817 if (!Fflag) { 818 memset(&nd, 0, sizeof(nd)); 819 strlcpy(nd.ifname, ifa->ifa_name, sizeof(nd.ifname)); 820 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) { 821 warnmsg(LOG_ERR, __func__, 822 "ioctl(SIOCGIFINFO_IN6)"); 823 exit(1); 824 } 825 if ((nd.ndi.flags & ND6_IFF_IFDISABLED)) 826 continue; 827 if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV)) 828 continue; 829 } 830 831 /* if we find multiple candidates, just warn. */ 832 if (n != 0 && dflag > 1) 833 warnmsg(LOG_WARNING, __func__, 834 "multiple interfaces found"); 835 836 a = realloc(argv, (n + 1) * sizeof(char *)); 837 if (a == NULL) { 838 warnmsg(LOG_ERR, __func__, "realloc"); 839 exit(1); 840 } 841 argv = a; 842 argv[n] = strdup(ifa->ifa_name); 843 if (!argv[n]) { 844 warnmsg(LOG_ERR, __func__, "malloc"); 845 exit(1); 846 } 847 n++; 848 } 849 850 if (n) { 851 a = realloc(argv, (n + 1) * sizeof(char *)); 852 if (a == NULL) { 853 warnmsg(LOG_ERR, __func__, "realloc"); 854 exit(1); 855 } 856 argv = a; 857 argv[n] = NULL; 858 859 if (dflag > 0) { 860 for (i = 0; i < n; i++) 861 warnmsg(LOG_WARNING, __func__, "probing %s", 862 argv[i]); 863 } 864 } 865 if (!Fflag) 866 close(s); 867 freeifaddrs(ifap); 868 return (argv); 869 } 870