1 /* $KAME: rtsold.c,v 1.67 2003/05/17 18:16:15 itojun Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $FreeBSD$ 32 */ 33 34 #include <sys/types.h> 35 #include <sys/ioctl.h> 36 #include <sys/time.h> 37 #include <sys/socket.h> 38 #include <sys/param.h> 39 40 #include <net/if.h> 41 #include <net/if_dl.h> 42 #include <net/if_var.h> 43 44 #include <netinet/in.h> 45 #include <netinet/icmp6.h> 46 #include <netinet/in_var.h> 47 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 <errno.h> 57 #include <err.h> 58 #include <stdarg.h> 59 #include <ifaddrs.h> 60 #ifdef HAVE_POLL_H 61 #include <poll.h> 62 #endif 63 64 #include "rtsold.h" 65 66 struct ifinfo *iflist; 67 struct timeval tm_max = {0x7fffffff, 0x7fffffff}; 68 static int log_upto = 999; 69 static int fflag = 0; 70 71 int Fflag = 0; /* force setting sysctl parameters */ 72 int aflag = 0; 73 int dflag = 0; 74 75 char *otherconf_script; 76 77 /* protocol constants */ 78 #define MAX_RTR_SOLICITATION_DELAY 1 /* second */ 79 #define RTR_SOLICITATION_INTERVAL 4 /* seconds */ 80 #define MAX_RTR_SOLICITATIONS 3 /* times */ 81 82 /* 83 * implementation dependent constants in seconds 84 * XXX: should be configurable 85 */ 86 #define PROBE_INTERVAL 60 87 88 int main(int, char **); 89 90 /* static variables and functions */ 91 static int mobile_node = 0; 92 #ifndef SMALL 93 static int do_dump; 94 static const char *dumpfilename = "/var/run/rtsold.dump"; /* XXX: should be configurable */ 95 #endif 96 #if 1 97 static const char *pidfilename = "/var/run/rtsold.pid"; /* should be configurable */ 98 #endif 99 100 #if 0 101 static int ifreconfig(char *); 102 #endif 103 static int make_packet(struct ifinfo *); 104 static struct timeval *rtsol_check_timer(void); 105 106 #ifndef SMALL 107 static void rtsold_set_dump_file(int); 108 #endif 109 static void usage(char *); 110 111 int 112 main(int argc, char **argv) 113 { 114 int s, ch, once = 0; 115 struct timeval *timeout; 116 char *argv0; 117 const char *opts; 118 #ifdef HAVE_POLL_H 119 struct pollfd set[2]; 120 #else 121 fd_set *fdsetp, *selectfdp; 122 int fdmasks; 123 int maxfd; 124 #endif 125 int rtsock; 126 127 /* 128 * Initialization 129 */ 130 argv0 = argv[0]; 131 132 /* get option */ 133 if (argv0 && argv0[strlen(argv0) - 1] != 'd') { 134 fflag = 1; 135 once = 1; 136 opts = "adDFO:"; 137 } else 138 opts = "adDfFm1O:"; 139 140 while ((ch = getopt(argc, argv, opts)) != -1) { 141 switch (ch) { 142 case 'a': 143 aflag = 1; 144 break; 145 case 'd': 146 dflag = 1; 147 break; 148 case 'D': 149 dflag = 2; 150 break; 151 case 'f': 152 fflag = 1; 153 break; 154 case 'F': 155 Fflag = 1; 156 break; 157 case 'm': 158 mobile_node = 1; 159 break; 160 case '1': 161 once = 1; 162 break; 163 case 'O': 164 otherconf_script = optarg; 165 break; 166 default: 167 usage(argv0); 168 /*NOTREACHED*/ 169 } 170 } 171 argc -= optind; 172 argv += optind; 173 174 if ((!aflag && argc == 0) || (aflag && argc != 0)) { 175 usage(argv0); 176 /*NOTREACHED*/ 177 } 178 179 /* set log level */ 180 if (dflag == 0) 181 log_upto = LOG_NOTICE; 182 if (!fflag) { 183 char *ident; 184 185 ident = strrchr(argv0, '/'); 186 if (!ident) 187 ident = argv0; 188 else 189 ident++; 190 openlog(ident, LOG_NDELAY|LOG_PID, LOG_DAEMON); 191 if (log_upto >= 0) 192 setlogmask(LOG_UPTO(log_upto)); 193 } 194 195 if (otherconf_script && *otherconf_script != '/') { 196 errx(1, "configuration script (%s) must be an absolute path", 197 otherconf_script); 198 } 199 200 #ifndef HAVE_ARC4RANDOM 201 /* random value initialization */ 202 srandom((u_long)time(NULL)); 203 #endif 204 205 if (Fflag) { 206 setinet6sysctl(IPV6CTL_FORWARDING, 0); 207 } else { 208 /* warn if forwarding is up */ 209 if (getinet6sysctl(IPV6CTL_FORWARDING)) 210 warnx("kernel is configured as a router, not a host"); 211 } 212 213 #ifndef SMALL 214 /* initialization to dump internal status to a file */ 215 signal(SIGUSR1, rtsold_set_dump_file); 216 #endif 217 218 if (!fflag) 219 daemon(0, 0); /* act as a daemon */ 220 221 /* 222 * Open a socket for sending RS and receiving RA. 223 * This should be done before calling ifinit(), since the function 224 * uses the socket. 225 */ 226 if ((s = sockopen()) < 0) { 227 warnmsg(LOG_ERR, __func__, "failed to open a socket"); 228 exit(1); 229 /*NOTREACHED*/ 230 } 231 #ifdef HAVE_POLL_H 232 set[0].fd = s; 233 set[0].events = POLLIN; 234 #else 235 maxfd = s; 236 #endif 237 238 #ifdef HAVE_POLL_H 239 set[1].fd = -1; 240 #endif 241 242 if ((rtsock = rtsock_open()) < 0) { 243 warnmsg(LOG_ERR, __func__, "failed to open a socket"); 244 exit(1); 245 /*NOTREACHED*/ 246 } 247 #ifdef HAVE_POLL_H 248 set[1].fd = rtsock; 249 set[1].events = POLLIN; 250 #else 251 if (rtsock > maxfd) 252 maxfd = rtsock; 253 #endif 254 255 #ifndef HAVE_POLL_H 256 fdmasks = howmany(maxfd + 1, NFDBITS) * sizeof(fd_mask); 257 if ((fdsetp = malloc(fdmasks)) == NULL) { 258 err(1, "malloc"); 259 /*NOTREACHED*/ 260 } 261 if ((selectfdp = malloc(fdmasks)) == NULL) { 262 err(1, "malloc"); 263 /*NOTREACHED*/ 264 } 265 #endif 266 267 /* configuration per interface */ 268 if (ifinit()) { 269 warnmsg(LOG_ERR, __func__, 270 "failed to initialize interfaces"); 271 exit(1); 272 /*NOTREACHED*/ 273 } 274 if (aflag) 275 argv = autoifprobe(); 276 while (argv && *argv) { 277 if (ifconfig(*argv)) { 278 warnmsg(LOG_ERR, __func__, 279 "failed to initialize %s", *argv); 280 exit(1); 281 /*NOTREACHED*/ 282 } 283 argv++; 284 } 285 286 /* setup for probing default routers */ 287 if (probe_init()) { 288 warnmsg(LOG_ERR, __func__, 289 "failed to setup for probing routers"); 290 exit(1); 291 /*NOTREACHED*/ 292 } 293 294 #if 1 295 /* dump the current pid */ 296 if (!once) { 297 pid_t pid = getpid(); 298 FILE *fp; 299 300 if ((fp = fopen(pidfilename, "w")) == NULL) 301 warnmsg(LOG_ERR, __func__, 302 "failed to open a pid log file(%s): %s", 303 pidfilename, strerror(errno)); 304 else { 305 fprintf(fp, "%d\n", pid); 306 fclose(fp); 307 } 308 } 309 #endif 310 311 #ifndef HAVE_POLL_H 312 memset(fdsetp, 0, fdmasks); 313 FD_SET(s, fdsetp); 314 FD_SET(rtsock, fdsetp); 315 #endif 316 while (1) { /* main loop */ 317 int e; 318 319 #ifndef HAVE_POLL_H 320 memcpy(selectfdp, fdsetp, fdmasks); 321 #endif 322 323 #ifndef SMALL 324 if (do_dump) { /* SIGUSR1 */ 325 do_dump = 0; 326 rtsold_dump_file(dumpfilename); 327 } 328 #endif 329 330 timeout = rtsol_check_timer(); 331 332 if (once) { 333 struct ifinfo *ifi; 334 335 /* if we have no timeout, we are done (or failed) */ 336 if (timeout == NULL) 337 break; 338 339 /* if all interfaces have got RA packet, we are done */ 340 for (ifi = iflist; ifi; ifi = ifi->next) { 341 if (ifi->state != IFS_DOWN && ifi->racnt == 0) 342 break; 343 } 344 if (ifi == NULL) 345 break; 346 } 347 #ifdef HAVE_POLL_H 348 e = poll(set, 2, timeout ? (timeout->tv_sec * 1000 + timeout->tv_usec / 1000) : INFTIM); 349 #else 350 e = select(maxfd + 1, selectfdp, NULL, NULL, timeout); 351 #endif 352 if (e < 1) { 353 if (e < 0 && errno != EINTR) { 354 warnmsg(LOG_ERR, __func__, "select: %s", 355 strerror(errno)); 356 } 357 continue; 358 } 359 360 /* packet reception */ 361 #ifdef HAVE_POLL_H 362 if (set[1].revents & POLLIN) 363 #else 364 if (FD_ISSET(rtsock, selectfdp)) 365 #endif 366 rtsock_input(rtsock); 367 #ifdef HAVE_POLL_H 368 if (set[0].revents & POLLIN) 369 #else 370 if (FD_ISSET(s, selectfdp)) 371 #endif 372 rtsol_input(s); 373 } 374 /* NOTREACHED */ 375 376 return 0; 377 } 378 379 int 380 ifconfig(char *ifname) 381 { 382 struct ifinfo *ifinfo; 383 struct sockaddr_dl *sdl; 384 int flags; 385 386 if ((sdl = if_nametosdl(ifname)) == NULL) { 387 warnmsg(LOG_ERR, __func__, 388 "failed to get link layer information for %s", ifname); 389 return(-1); 390 } 391 if (find_ifinfo(sdl->sdl_index)) { 392 warnmsg(LOG_ERR, __func__, 393 "interface %s was already configured", ifname); 394 free(sdl); 395 return(-1); 396 } 397 398 if ((ifinfo = malloc(sizeof(*ifinfo))) == NULL) { 399 warnmsg(LOG_ERR, __func__, "memory allocation failed"); 400 free(sdl); 401 return(-1); 402 } 403 memset(ifinfo, 0, sizeof(*ifinfo)); 404 ifinfo->sdl = sdl; 405 406 strlcpy(ifinfo->ifname, ifname, sizeof(ifinfo->ifname)); 407 408 /* construct a router solicitation message */ 409 if (make_packet(ifinfo)) 410 goto bad; 411 412 /* set link ID of this interface. */ 413 #ifdef HAVE_SCOPELIB 414 if (inet_zoneid(AF_INET6, 2, ifname, &ifinfo->linkid)) 415 goto bad; 416 #else 417 /* XXX: assume interface IDs as link IDs */ 418 ifinfo->linkid = ifinfo->sdl->sdl_index; 419 #endif 420 421 /* 422 * check if the interface is available. 423 * also check if SIOCGIFMEDIA ioctl is OK on the interface. 424 */ 425 ifinfo->mediareqok = 1; 426 ifinfo->active = interface_status(ifinfo); 427 if (!ifinfo->mediareqok) { 428 /* 429 * probe routers periodically even if the link status 430 * does not change. 431 */ 432 ifinfo->probeinterval = PROBE_INTERVAL; 433 } 434 435 /* activate interface: interface_up returns 0 on success */ 436 flags = interface_up(ifinfo->ifname); 437 if (flags == 0) 438 ifinfo->state = IFS_DELAY; 439 else if (flags == IFS_TENTATIVE) 440 ifinfo->state = IFS_TENTATIVE; 441 else 442 ifinfo->state = IFS_DOWN; 443 444 rtsol_timer_update(ifinfo); 445 446 /* link into chain */ 447 if (iflist) 448 ifinfo->next = iflist; 449 iflist = ifinfo; 450 451 return(0); 452 453 bad: 454 free(ifinfo->sdl); 455 free(ifinfo); 456 return(-1); 457 } 458 459 void 460 iflist_init(void) 461 { 462 struct ifinfo *ifi, *next; 463 464 for (ifi = iflist; ifi; ifi = next) { 465 next = ifi->next; 466 if (ifi->sdl) 467 free(ifi->sdl); 468 if (ifi->rs_data) 469 free(ifi->rs_data); 470 free(ifi); 471 iflist = NULL; 472 } 473 } 474 475 #if 0 476 static int 477 ifreconfig(char *ifname) 478 { 479 struct ifinfo *ifi, *prev; 480 int rv; 481 482 prev = NULL; 483 for (ifi = iflist; ifi; ifi = ifi->next) { 484 if (strncmp(ifi->ifname, ifname, sizeof(ifi->ifname)) == 0) 485 break; 486 prev = ifi; 487 } 488 prev->next = ifi->next; 489 490 rv = ifconfig(ifname); 491 492 /* reclaim it after ifconfig() in case ifname is pointer inside ifi */ 493 if (ifi->rs_data) 494 free(ifi->rs_data); 495 free(ifi->sdl); 496 free(ifi); 497 return rv; 498 } 499 #endif 500 501 struct ifinfo * 502 find_ifinfo(int ifindex) 503 { 504 struct ifinfo *ifi; 505 506 for (ifi = iflist; ifi; ifi = ifi->next) 507 if (ifi->sdl->sdl_index == ifindex) 508 return(ifi); 509 return(NULL); 510 } 511 512 static int 513 make_packet(struct ifinfo *ifinfo) 514 { 515 size_t packlen = sizeof(struct nd_router_solicit), lladdroptlen = 0; 516 struct nd_router_solicit *rs; 517 char *buf; 518 519 if ((lladdroptlen = lladdropt_length(ifinfo->sdl)) == 0) { 520 warnmsg(LOG_INFO, __func__, 521 "link-layer address option has null length" 522 " on %s. Treat as not included.", ifinfo->ifname); 523 } 524 packlen += lladdroptlen; 525 ifinfo->rs_datalen = packlen; 526 527 /* allocate buffer */ 528 if ((buf = malloc(packlen)) == NULL) { 529 warnmsg(LOG_ERR, __func__, 530 "memory allocation failed for %s", ifinfo->ifname); 531 return(-1); 532 } 533 ifinfo->rs_data = buf; 534 535 /* fill in the message */ 536 rs = (struct nd_router_solicit *)buf; 537 rs->nd_rs_type = ND_ROUTER_SOLICIT; 538 rs->nd_rs_code = 0; 539 rs->nd_rs_cksum = 0; 540 rs->nd_rs_reserved = 0; 541 buf += sizeof(*rs); 542 543 /* fill in source link-layer address option */ 544 if (lladdroptlen) 545 lladdropt_fill(ifinfo->sdl, (struct nd_opt_hdr *)buf); 546 547 return(0); 548 } 549 550 static struct timeval * 551 rtsol_check_timer(void) 552 { 553 static struct timeval returnval; 554 struct timeval now, rtsol_timer; 555 struct ifinfo *ifinfo; 556 int flags; 557 558 gettimeofday(&now, NULL); 559 560 rtsol_timer = tm_max; 561 562 for (ifinfo = iflist; ifinfo; ifinfo = ifinfo->next) { 563 if (timercmp(&ifinfo->expire, &now, <=)) { 564 if (dflag > 1) 565 warnmsg(LOG_DEBUG, __func__, 566 "timer expiration on %s, " 567 "state = %d", ifinfo->ifname, 568 ifinfo->state); 569 570 switch (ifinfo->state) { 571 case IFS_DOWN: 572 case IFS_TENTATIVE: 573 /* interface_up returns 0 on success */ 574 flags = interface_up(ifinfo->ifname); 575 if (flags == 0) 576 ifinfo->state = IFS_DELAY; 577 else if (flags == IFS_TENTATIVE) 578 ifinfo->state = IFS_TENTATIVE; 579 else 580 ifinfo->state = IFS_DOWN; 581 break; 582 case IFS_IDLE: 583 { 584 int oldstatus = ifinfo->active; 585 int probe = 0; 586 587 ifinfo->active = interface_status(ifinfo); 588 589 if (oldstatus != ifinfo->active) { 590 warnmsg(LOG_DEBUG, __func__, 591 "%s status is changed" 592 " from %d to %d", 593 ifinfo->ifname, 594 oldstatus, ifinfo->active); 595 probe = 1; 596 ifinfo->state = IFS_DELAY; 597 } else if (ifinfo->probeinterval && 598 (ifinfo->probetimer -= 599 ifinfo->timer.tv_sec) <= 0) { 600 /* probe timer expired */ 601 ifinfo->probetimer = 602 ifinfo->probeinterval; 603 probe = 1; 604 ifinfo->state = IFS_PROBE; 605 } 606 607 /* 608 * If we need a probe, clear the previous 609 * status wrt the "other" configuration. 610 */ 611 if (probe) 612 ifinfo->otherconfig = 0; 613 614 if (probe && mobile_node) 615 defrouter_probe(ifinfo); 616 break; 617 } 618 case IFS_DELAY: 619 ifinfo->state = IFS_PROBE; 620 sendpacket(ifinfo); 621 break; 622 case IFS_PROBE: 623 if (ifinfo->probes < MAX_RTR_SOLICITATIONS) 624 sendpacket(ifinfo); 625 else { 626 warnmsg(LOG_INFO, __func__, 627 "No answer after sending %d RSs", 628 ifinfo->probes); 629 ifinfo->probes = 0; 630 ifinfo->state = IFS_IDLE; 631 } 632 break; 633 } 634 rtsol_timer_update(ifinfo); 635 } 636 637 if (timercmp(&ifinfo->expire, &rtsol_timer, <)) 638 rtsol_timer = ifinfo->expire; 639 } 640 641 if (timercmp(&rtsol_timer, &tm_max, ==)) { 642 warnmsg(LOG_DEBUG, __func__, "there is no timer"); 643 return(NULL); 644 } else if (timercmp(&rtsol_timer, &now, <)) 645 /* this may occur when the interval is too small */ 646 returnval.tv_sec = returnval.tv_usec = 0; 647 else 648 timersub(&rtsol_timer, &now, &returnval); 649 650 if (dflag > 1) 651 warnmsg(LOG_DEBUG, __func__, "New timer is %ld:%08ld", 652 (long)returnval.tv_sec, (long)returnval.tv_usec); 653 654 return(&returnval); 655 } 656 657 void 658 rtsol_timer_update(struct ifinfo *ifinfo) 659 { 660 #define MILLION 1000000 661 #define DADRETRY 10 /* XXX: adhoc */ 662 long interval; 663 struct timeval now; 664 665 bzero(&ifinfo->timer, sizeof(ifinfo->timer)); 666 667 switch (ifinfo->state) { 668 case IFS_DOWN: 669 case IFS_TENTATIVE: 670 if (++ifinfo->dadcount > DADRETRY) { 671 ifinfo->dadcount = 0; 672 ifinfo->timer.tv_sec = PROBE_INTERVAL; 673 } else 674 ifinfo->timer.tv_sec = 1; 675 break; 676 case IFS_IDLE: 677 if (mobile_node) { 678 /* XXX should be configurable */ 679 ifinfo->timer.tv_sec = 3; 680 } 681 else 682 ifinfo->timer = tm_max; /* stop timer(valid?) */ 683 break; 684 case IFS_DELAY: 685 #ifndef HAVE_ARC4RANDOM 686 interval = random() % (MAX_RTR_SOLICITATION_DELAY * MILLION); 687 #else 688 interval = arc4random_uniform(MAX_RTR_SOLICITATION_DELAY * MILLION); 689 #endif 690 ifinfo->timer.tv_sec = interval / MILLION; 691 ifinfo->timer.tv_usec = interval % MILLION; 692 break; 693 case IFS_PROBE: 694 if (ifinfo->probes < MAX_RTR_SOLICITATIONS) 695 ifinfo->timer.tv_sec = RTR_SOLICITATION_INTERVAL; 696 else { 697 /* 698 * After sending MAX_RTR_SOLICITATIONS solicitations, 699 * we're just waiting for possible replies; there 700 * will be no more solicitation. Thus, we change 701 * the timer value to MAX_RTR_SOLICITATION_DELAY based 702 * on RFC 2461, Section 6.3.7. 703 */ 704 ifinfo->timer.tv_sec = MAX_RTR_SOLICITATION_DELAY; 705 } 706 break; 707 default: 708 warnmsg(LOG_ERR, __func__, 709 "illegal interface state(%d) on %s", 710 ifinfo->state, ifinfo->ifname); 711 return; 712 } 713 714 /* reset the timer */ 715 if (timercmp(&ifinfo->timer, &tm_max, ==)) { 716 ifinfo->expire = tm_max; 717 warnmsg(LOG_DEBUG, __func__, 718 "stop timer for %s", ifinfo->ifname); 719 } else { 720 gettimeofday(&now, NULL); 721 timeradd(&now, &ifinfo->timer, &ifinfo->expire); 722 723 if (dflag > 1) 724 warnmsg(LOG_DEBUG, __func__, 725 "set timer for %s to %d:%d", ifinfo->ifname, 726 (int)ifinfo->timer.tv_sec, 727 (int)ifinfo->timer.tv_usec); 728 } 729 730 #undef MILLION 731 } 732 733 /* timer related utility functions */ 734 #define MILLION 1000000 735 736 #ifndef SMALL 737 static void 738 rtsold_set_dump_file(int sig __unused) 739 { 740 do_dump = 1; 741 } 742 #endif 743 744 static void 745 usage(char *progname) 746 { 747 if (progname && progname[strlen(progname) - 1] != 'd') { 748 fprintf(stderr, "usage: rtsol [-dDF] interfaces...\n"); 749 fprintf(stderr, "usage: rtsol [-dDF] -a\n"); 750 } else { 751 fprintf(stderr, "usage: rtsold [-adDfFm1] interfaces...\n"); 752 fprintf(stderr, "usage: rtsold [-dDfFm1] -a\n"); 753 } 754 exit(1); 755 } 756 757 void 758 #if __STDC__ 759 warnmsg(int priority, const char *func, const char *msg, ...) 760 #else 761 warnmsg(priority, func, msg, va_alist) 762 int priority; 763 const char *func; 764 const char *msg; 765 va_dcl 766 #endif 767 { 768 va_list ap; 769 char buf[BUFSIZ]; 770 771 va_start(ap, msg); 772 if (fflag) { 773 if (priority <= log_upto) { 774 (void)vfprintf(stderr, msg, ap); 775 (void)fprintf(stderr, "\n"); 776 } 777 } else { 778 snprintf(buf, sizeof(buf), "<%s> %s", func, msg); 779 msg = buf; 780 vsyslog(priority, msg, ap); 781 } 782 va_end(ap); 783 } 784 785 /* 786 * return a list of interfaces which is suitable to sending an RS. 787 */ 788 char ** 789 autoifprobe(void) 790 { 791 static char **argv = NULL; 792 static int n = 0; 793 char **a; 794 int s = 0, i, found; 795 struct ifaddrs *ifap, *ifa, *target; 796 struct in6_ndireq nd; 797 798 /* initialize */ 799 while (n--) 800 free(argv[n]); 801 if (argv) { 802 free(argv); 803 argv = NULL; 804 } 805 n = 0; 806 807 if (getifaddrs(&ifap) != 0) 808 return NULL; 809 810 if (!Fflag && (s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 811 err(1, "socket"); 812 /* NOTREACHED */ 813 } 814 815 target = NULL; 816 /* find an ethernet */ 817 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 818 if ((ifa->ifa_flags & IFF_UP) == 0) 819 continue; 820 if ((ifa->ifa_flags & IFF_POINTOPOINT) != 0) 821 continue; 822 if ((ifa->ifa_flags & IFF_LOOPBACK) != 0) 823 continue; 824 if ((ifa->ifa_flags & IFF_MULTICAST) == 0) 825 continue; 826 827 if (ifa->ifa_addr->sa_family != AF_INET6) 828 continue; 829 830 found = 0; 831 for (i = 0; i < n; i++) { 832 if (strcmp(argv[i], ifa->ifa_name) == 0) { 833 found++; 834 break; 835 } 836 } 837 if (found) 838 continue; 839 840 /* 841 * Skip the interfaces which IPv6 and/or accepting RA 842 * is disabled. 843 */ 844 if (!Fflag) { 845 memset(&nd, 0, sizeof(nd)); 846 strlcpy(nd.ifname, ifa->ifa_name, sizeof(nd.ifname)); 847 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) { 848 err(1, "ioctl(SIOCGIFINFO_IN6)"); 849 /* NOTREACHED */ 850 } 851 if ((nd.ndi.flags & ND6_IFF_IFDISABLED)) 852 continue; 853 if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV)) 854 continue; 855 } 856 857 /* if we find multiple candidates, just warn. */ 858 if (n != 0 && dflag > 1) 859 warnx("multiple interfaces found"); 860 861 a = (char **)realloc(argv, (n + 1) * sizeof(char **)); 862 if (a == NULL) 863 err(1, "realloc"); 864 argv = a; 865 argv[n] = strdup(ifa->ifa_name); 866 if (!argv[n]) 867 err(1, "malloc"); 868 n++; 869 } 870 871 if (n) { 872 a = (char **)realloc(argv, (n + 1) * sizeof(char **)); 873 if (a == NULL) 874 err(1, "realloc"); 875 argv = a; 876 argv[n] = NULL; 877 878 if (dflag > 0) { 879 for (i = 0; i < n; i++) 880 warnx("probing %s", argv[i]); 881 } 882 } 883 if (!Fflag) 884 close(s); 885 freeifaddrs(ifap); 886 return argv; 887 } 888