1 /* $NetBSD: main.c,v 1.39 2004/07/06 16:43:18 wiz Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1988, 1993 5 * The Regents of the University of California. 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgment: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include "defs.h" 37 #include "pathnames.h" 38 #ifdef sgi 39 #include "math.h" 40 #endif 41 #include <signal.h> 42 #include <fcntl.h> 43 #include <sys/file.h> 44 45 __COPYRIGHT("@(#) Copyright (c) 1983, 1988, 1993\n" 46 "The Regents of the University of California." 47 " All rights reserved.\n"); 48 #ifdef __NetBSD__ 49 __RCSID("$NetBSD: main.c,v 1.39 2004/07/06 16:43:18 wiz Exp $"); 50 #elif defined(__FreeBSD__) 51 __RCSID("$FreeBSD$"); 52 #else 53 __RCSID("Revision: 2.27 "); 54 #ident "Revision: 2.27 " 55 #endif 56 57 #if defined(__NetBSD__) 58 #include <util.h> 59 #endif 60 61 pid_t mypid; 62 63 naddr myaddr; /* system address */ 64 char myname[MAXHOSTNAMELEN+1]; 65 66 int verbose; 67 68 int supplier; /* supply or broadcast updates */ 69 int supplier_set; 70 int ipforwarding = 1; /* kernel forwarding on */ 71 72 int default_gateway; /* 1=advertise default */ 73 int background = 1; 74 int ridhosts; /* 1=reduce host routes */ 75 int mhome; /* 1=want multi-homed host route */ 76 int advertise_mhome; /* 1=must continue advertising it */ 77 int auth_ok = 1; /* 1=ignore auth if we do not care */ 78 79 struct timeval epoch; /* when started */ 80 struct timeval clk, prev_clk; 81 static int usec_fudge; 82 struct timeval now; /* current idea of time */ 83 time_t now_stale; 84 time_t now_expire; 85 time_t now_garbage; 86 87 struct timeval next_bcast; /* next general broadcast */ 88 struct timeval no_flash = { /* inhibit flash update */ 89 EPOCH+SUPPLY_INTERVAL, 0 90 }; 91 92 struct timeval flush_kern_timer; 93 94 fd_set *fdbitsp; 95 int sock_max; 96 int rip_sock = -1; /* RIP socket */ 97 struct interface *rip_sock_mcast; /* current multicast interface */ 98 int rt_sock; /* routing socket */ 99 int rt_sock_seqno; 100 101 102 static int get_rip_sock(naddr, int); 103 static void timevalsub(struct timeval *, struct timeval *, struct timeval *); 104 105 int 106 main(int argc, 107 char *argv[]) 108 { 109 int n, mib[4], off; 110 size_t len; 111 char *p, *q; 112 const char *cp; 113 struct timeval wtime, t2; 114 time_t dt; 115 fd_set *ibitsp = NULL; 116 naddr p_net, p_mask; 117 struct interface *ifp; 118 struct parm parm; 119 char *tracename = 0; 120 121 122 /* Some shells are badly broken and send SIGHUP to backgrounded 123 * processes. 124 */ 125 signal(SIGHUP, SIG_IGN); 126 127 openlog("routed", LOG_PID, LOG_DAEMON); 128 ftrace = stdout; 129 130 gettimeofday(&clk, 0); 131 prev_clk = clk; 132 epoch = clk; 133 epoch.tv_sec -= EPOCH; 134 now.tv_sec = EPOCH; 135 now_stale = EPOCH - STALE_TIME; 136 now_expire = EPOCH - EXPIRE_TIME; 137 now_garbage = EPOCH - GARBAGE_TIME; 138 wtime.tv_sec = 0; 139 140 (void)gethostname(myname, sizeof(myname) - 1); 141 (void)gethost(myname, &myaddr); 142 143 while ((n = getopt(argc, argv, "sqdghmAtvT:F:P:")) != -1) { 144 switch (n) { 145 case 's': 146 supplier = 1; 147 supplier_set = 1; 148 break; 149 150 case 'q': 151 supplier = 0; 152 supplier_set = 1; 153 break; 154 155 case 'd': 156 background = 0; 157 break; 158 159 case 'g': 160 memset(&parm, 0, sizeof(parm)); 161 parm.parm_d_metric = 1; 162 cp = check_parms(&parm); 163 if (cp != 0) 164 msglog("bad -g: %s", cp); 165 else 166 default_gateway = 1; 167 break; 168 169 case 'h': /* suppress extra host routes */ 170 ridhosts = 1; 171 break; 172 173 case 'm': /* advertise host route */ 174 mhome = 1; /* on multi-homed hosts */ 175 break; 176 177 case 'A': 178 /* Ignore authentication if we do not care. 179 * Crazy as it is, that is what RFC 1723 requires. 180 */ 181 auth_ok = 0; 182 break; 183 184 case 't': 185 new_tracelevel++; 186 break; 187 188 case 'T': 189 tracename = optarg; 190 break; 191 192 case 'F': /* minimal routes for SLIP */ 193 n = FAKE_METRIC; 194 p = strchr(optarg,','); 195 if (p && *p != '\0') { 196 n = (int)strtoul(p+1, &q, 0); 197 if (*q == '\0' 198 && n <= HOPCNT_INFINITY-1 199 && n >= 1) 200 *p = '\0'; 201 } 202 if (!getnet(optarg, &p_net, &p_mask)) { 203 msglog("bad network; \"-F %s\"", 204 optarg); 205 break; 206 } 207 memset(&parm, 0, sizeof(parm)); 208 parm.parm_net = p_net; 209 parm.parm_mask = p_mask; 210 parm.parm_d_metric = n; 211 cp = check_parms(&parm); 212 if (cp != 0) 213 msglog("bad -F: %s", cp); 214 break; 215 216 case 'P': 217 /* handle arbitrary parameters. 218 */ 219 q = strdup(optarg); 220 cp = parse_parms(q, 0); 221 if (cp != 0) 222 msglog("%s in \"-P %s\"", cp, optarg); 223 free(q); 224 break; 225 226 case 'v': 227 /* display version */ 228 verbose++; 229 msglog("version 2.28"); 230 break; 231 232 default: 233 goto usage; 234 } 235 } 236 argc -= optind; 237 argv += optind; 238 239 if (tracename == 0 && argc >= 1) { 240 tracename = *argv++; 241 argc--; 242 } 243 if (tracename != 0 && tracename[0] == '\0') 244 goto usage; 245 if (argc != 0) { 246 usage: 247 logbad(0, "usage: routed [-sqdghmAtv] [-T tracefile]" 248 " [-F net[/mask[,metric]]] [-P parms]"); 249 } 250 if (geteuid() != 0) { 251 if (verbose) 252 exit(0); 253 logbad(0, "requires UID 0"); 254 } 255 256 mib[0] = CTL_NET; 257 mib[1] = PF_INET; 258 mib[2] = IPPROTO_IP; 259 mib[3] = IPCTL_FORWARDING; 260 len = sizeof(ipforwarding); 261 if (sysctl(mib, 4, &ipforwarding, &len, 0, 0) < 0) 262 LOGERR("sysctl(IPCTL_FORWARDING)"); 263 264 if (!ipforwarding) { 265 if (supplier) 266 msglog("-s incompatible with ipforwarding=0"); 267 if (default_gateway) { 268 msglog("-g incompatible with ipforwarding=0"); 269 default_gateway = 0; 270 } 271 supplier = 0; 272 supplier_set = 1; 273 } 274 if (default_gateway) { 275 if (supplier_set && !supplier) { 276 msglog("-g and -q incompatible"); 277 } else { 278 supplier = 1; 279 supplier_set = 1; 280 } 281 } 282 283 284 signal(SIGALRM, sigalrm); 285 if (!background) 286 signal(SIGHUP, sigterm); /* SIGHUP fatal during debugging */ 287 signal(SIGTERM, sigterm); 288 signal(SIGINT, sigterm); 289 signal(SIGUSR1, sigtrace_on); 290 signal(SIGUSR2, sigtrace_off); 291 292 /* get into the background */ 293 #ifdef sgi 294 if (0 > _daemonize(background ? 0 : (_DF_NOCHDIR|_DF_NOFORK), 295 STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO)) 296 BADERR(0, "_daemonize()"); 297 #else 298 if (background && daemon(0, 1) < 0) 299 BADERR(0,"daemon()"); 300 #endif 301 302 #if defined(__NetBSD__) 303 pidfile(NULL); 304 #endif 305 mypid = getpid(); 306 307 /* prepare socket connected to the kernel. 308 */ 309 rt_sock = socket(AF_ROUTE, SOCK_RAW, 0); 310 if (rt_sock < 0) 311 BADERR(1,"rt_sock = socket()"); 312 if (fcntl(rt_sock, F_SETFL, O_NONBLOCK) == -1) 313 logbad(1, "fcntl(rt_sock) O_NONBLOCK: %s", strerror(errno)); 314 off = 0; 315 if (setsockopt(rt_sock, SOL_SOCKET,SO_USELOOPBACK, 316 &off,sizeof(off)) < 0) 317 LOGERR("setsockopt(SO_USELOOPBACK,0)"); 318 319 fix_select(); 320 321 322 if (tracename != 0) { 323 strlcpy(inittracename, tracename, sizeof(inittracename)); 324 set_tracefile(inittracename, "%s", -1); 325 } else { 326 tracelevel_msg("%s", -1); /* turn on tracing to stdio */ 327 } 328 329 bufinit(); 330 331 /* initialize radix tree */ 332 rtinit(); 333 334 /* Pick a random part of the second for our output to minimize 335 * collisions. 336 * 337 * Start broadcasting after hearing from other routers, and 338 * at a random time so a bunch of systems do not get synchronized 339 * after a power failure. 340 */ 341 intvl_random(&next_bcast, EPOCH+MIN_WAITTIME, EPOCH+SUPPLY_INTERVAL); 342 age_timer.tv_usec = next_bcast.tv_usec; 343 age_timer.tv_sec = EPOCH+MIN_WAITTIME; 344 rdisc_timer = next_bcast; 345 ifinit_timer.tv_usec = next_bcast.tv_usec; 346 347 /* Collect an initial view of the world by checking the interface 348 * configuration and the kludge file. 349 */ 350 gwkludge(); 351 ifinit(); 352 353 /* Ask for routes */ 354 rip_query(); 355 rdisc_sol(); 356 357 /* Now turn off stdio if not tracing */ 358 if (new_tracelevel == 0) 359 trace_close(background); 360 361 /* Loop forever, listening and broadcasting. 362 */ 363 for (;;) { 364 prev_clk = clk; 365 gettimeofday(&clk, 0); 366 if (prev_clk.tv_sec == clk.tv_sec 367 && prev_clk.tv_usec == clk.tv_usec+usec_fudge) { 368 /* Much of `routed` depends on time always advancing. 369 * On systems that do not guarantee that gettimeofday() 370 * produces unique timestamps even if called within 371 * a single tick, use trickery like that in classic 372 * BSD kernels. 373 */ 374 clk.tv_usec += ++usec_fudge; 375 376 } else { 377 usec_fudge = 0; 378 379 timevalsub(&t2, &clk, &prev_clk); 380 if (t2.tv_sec < 0 381 || t2.tv_sec > wtime.tv_sec + 5) { 382 /* Deal with time changes before other 383 * housekeeping to keep everything straight. 384 */ 385 dt = t2.tv_sec; 386 if (dt > 0) 387 dt -= wtime.tv_sec; 388 trace_act("time changed by %d sec", (int)dt); 389 epoch.tv_sec += dt; 390 } 391 } 392 timevalsub(&now, &clk, &epoch); 393 now_stale = now.tv_sec - STALE_TIME; 394 now_expire = now.tv_sec - EXPIRE_TIME; 395 now_garbage = now.tv_sec - GARBAGE_TIME; 396 397 /* deal with signals that should affect tracing */ 398 set_tracelevel(); 399 400 if (stopint != 0) { 401 rip_bcast(0); 402 rdisc_adv(); 403 trace_off("exiting with signal %d", stopint); 404 exit(stopint | 128); 405 } 406 407 /* look for new or dead interfaces */ 408 timevalsub(&wtime, &ifinit_timer, &now); 409 if (wtime.tv_sec <= 0) { 410 wtime.tv_sec = 0; 411 ifinit(); 412 rip_query(); 413 continue; 414 } 415 416 /* Check the kernel table occassionally for mysteriously 417 * evaporated routes 418 */ 419 timevalsub(&t2, &flush_kern_timer, &now); 420 if (t2.tv_sec <= 0) { 421 flush_kern(); 422 flush_kern_timer.tv_sec = (now.tv_sec 423 + CHECK_QUIET_INTERVAL); 424 continue; 425 } 426 if (timercmp(&t2, &wtime, <)) 427 wtime = t2; 428 429 /* If it is time, then broadcast our routes. 430 */ 431 if (supplier || advertise_mhome) { 432 timevalsub(&t2, &next_bcast, &now); 433 if (t2.tv_sec <= 0) { 434 /* Synchronize the aging and broadcast 435 * timers to minimize awakenings 436 */ 437 age(0); 438 439 rip_bcast(0); 440 441 /* It is desirable to send routing updates 442 * regularly. So schedule the next update 443 * 30 seconds after the previous one was 444 * scheduled, instead of 30 seconds after 445 * the previous update was finished. 446 * Even if we just started after discovering 447 * a 2nd interface or were otherwise delayed, 448 * pick a 30-second aniversary of the 449 * original broadcast time. 450 */ 451 n = 1 + (0-t2.tv_sec)/SUPPLY_INTERVAL; 452 next_bcast.tv_sec += n*SUPPLY_INTERVAL; 453 454 continue; 455 } 456 457 if (timercmp(&t2, &wtime, <)) 458 wtime = t2; 459 } 460 461 /* If we need a flash update, either do it now or 462 * set the delay to end when it is time. 463 * 464 * If we are within MIN_WAITTIME seconds of a full update, 465 * do not bother. 466 */ 467 if (need_flash 468 && supplier 469 && no_flash.tv_sec+MIN_WAITTIME < next_bcast.tv_sec) { 470 /* accurate to the millisecond */ 471 if (!timercmp(&no_flash, &now, >)) 472 rip_bcast(1); 473 timevalsub(&t2, &no_flash, &now); 474 if (timercmp(&t2, &wtime, <)) 475 wtime = t2; 476 } 477 478 /* trigger the main aging timer. 479 */ 480 timevalsub(&t2, &age_timer, &now); 481 if (t2.tv_sec <= 0) { 482 age(0); 483 continue; 484 } 485 if (timercmp(&t2, &wtime, <)) 486 wtime = t2; 487 488 /* update the kernel routing table 489 */ 490 timevalsub(&t2, &need_kern, &now); 491 if (t2.tv_sec <= 0) { 492 age(0); 493 continue; 494 } 495 if (timercmp(&t2, &wtime, <)) 496 wtime = t2; 497 498 /* take care of router discovery, 499 * but do it in the correct the millisecond 500 */ 501 if (!timercmp(&rdisc_timer, &now, >)) { 502 rdisc_age(0); 503 continue; 504 } 505 timevalsub(&t2, &rdisc_timer, &now); 506 if (timercmp(&t2, &wtime, <)) 507 wtime = t2; 508 509 510 /* wait for input or a timer to expire. 511 */ 512 trace_flush(); 513 if (ibitsp) 514 free(ibitsp); 515 ibitsp = (fd_set *)calloc(howmany(sock_max, NFDBITS), 516 sizeof(fd_mask)); 517 if (ibitsp == NULL) 518 BADERR(1, "calloc"); 519 memcpy(ibitsp, fdbitsp, howmany(sock_max, NFDBITS) * 520 sizeof(fd_mask)); 521 n = select(sock_max, ibitsp, 0, 0, &wtime); 522 if (n <= 0) { 523 if (n < 0 && errno != EINTR && errno != EAGAIN) 524 BADERR(1,"select"); 525 continue; 526 } 527 528 if (FD_ISSET(rt_sock, ibitsp)) { 529 read_rt(); 530 n--; 531 } 532 if (rdisc_sock >= 0 && FD_ISSET(rdisc_sock, ibitsp)) { 533 read_d(); 534 n--; 535 } 536 if (rip_sock >= 0 && FD_ISSET(rip_sock, ibitsp)) { 537 read_rip(rip_sock, 0); 538 n--; 539 } 540 541 for (ifp = ifnet; n > 0 && 0 != ifp; ifp = ifp->int_next) { 542 if (ifp->int_rip_sock >= 0 543 && FD_ISSET(ifp->int_rip_sock, ibitsp)) { 544 read_rip(ifp->int_rip_sock, ifp); 545 n--; 546 } 547 } 548 } 549 } 550 551 552 /* ARGSUSED */ 553 void 554 sigalrm(int s UNUSED) 555 { 556 /* Historically, SIGALRM would cause the daemon to check for 557 * new and broken interfaces. 558 */ 559 ifinit_timer.tv_sec = now.tv_sec; 560 trace_act("SIGALRM"); 561 } 562 563 564 /* watch for fatal signals */ 565 void 566 sigterm(int sig) 567 { 568 stopint = sig; 569 (void)signal(sig, SIG_DFL); /* catch it only once */ 570 } 571 572 573 void 574 fix_select(void) 575 { 576 struct interface *ifp; 577 578 sock_max = 0; 579 580 if (sock_max <= rt_sock) 581 sock_max = rt_sock + 1; 582 if (rip_sock >= 0) 583 if (sock_max <= rip_sock) 584 sock_max = rip_sock + 1; 585 for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) { 586 if (ifp->int_rip_sock >= 0) 587 if (sock_max <= ifp->int_rip_sock) 588 sock_max = ifp->int_rip_sock + 1; 589 } 590 if (rdisc_sock >= 0) 591 if (sock_max <= rdisc_sock) 592 sock_max = rdisc_sock + 1; 593 594 if (fdbitsp) 595 free(fdbitsp); 596 fdbitsp = (fd_set *)calloc(howmany(sock_max, NFDBITS), 597 sizeof(fd_mask)); 598 if (fdbitsp == NULL) 599 BADERR(1, "calloc"); 600 601 FD_SET(rt_sock, fdbitsp); 602 if (rip_sock >= 0) 603 FD_SET(rip_sock, fdbitsp); 604 for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) { 605 if (ifp->int_rip_sock >= 0) 606 FD_SET(ifp->int_rip_sock, fdbitsp); 607 } 608 if (rdisc_sock >= 0) 609 FD_SET(rdisc_sock, fdbitsp); 610 } 611 612 613 void 614 fix_sock(int sock, 615 const char *name) 616 { 617 int on; 618 #define MIN_SOCKBUF (4*1024) 619 static int rbuf; 620 621 if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1) 622 logbad(1, "fcntl(%s) O_NONBLOCK: %s", 623 name, strerror(errno)); 624 on = 1; 625 if (setsockopt(sock, SOL_SOCKET,SO_BROADCAST, &on,sizeof(on)) < 0) 626 msglog("setsockopt(%s,SO_BROADCAST): %s", 627 name, strerror(errno)); 628 #ifdef USE_PASSIFNAME 629 on = 1; 630 if (setsockopt(sock, SOL_SOCKET, SO_PASSIFNAME, &on,sizeof(on)) < 0) 631 msglog("setsockopt(%s,SO_PASSIFNAME): %s", 632 name, strerror(errno)); 633 #endif 634 635 if (rbuf >= MIN_SOCKBUF) { 636 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, 637 &rbuf, sizeof(rbuf)) < 0) 638 msglog("setsockopt(%s,SO_RCVBUF=%d): %s", 639 name, rbuf, strerror(errno)); 640 } else { 641 for (rbuf = 60*1024; ; rbuf -= 4096) { 642 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, 643 &rbuf, sizeof(rbuf)) == 0) { 644 trace_act("RCVBUF=%d", rbuf); 645 break; 646 } 647 if (rbuf < MIN_SOCKBUF) { 648 msglog("setsockopt(%s,SO_RCVBUF = %d): %s", 649 name, rbuf, strerror(errno)); 650 break; 651 } 652 } 653 } 654 } 655 656 657 /* get a rip socket 658 */ 659 static int /* <0 or file descriptor */ 660 get_rip_sock(naddr addr, 661 int serious) /* 1=failure to bind is serious */ 662 { 663 struct sockaddr_in rsin; 664 unsigned char ttl; 665 int s; 666 667 668 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) 669 BADERR(1,"rip_sock = socket()"); 670 671 memset(&rsin, 0, sizeof(rsin)); 672 #ifdef _HAVE_SIN_LEN 673 rsin.sin_len = sizeof(rsin); 674 #endif 675 rsin.sin_family = AF_INET; 676 rsin.sin_port = htons(RIP_PORT); 677 rsin.sin_addr.s_addr = addr; 678 if (bind(s, (struct sockaddr *)&rsin, sizeof(rsin)) < 0) { 679 if (serious) 680 BADERR(errno != EADDRINUSE, "bind(rip_sock)"); 681 return -1; 682 } 683 fix_sock(s,"rip_sock"); 684 685 ttl = 1; 686 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, 687 &ttl, sizeof(ttl)) < 0) 688 DBGERR(1,"rip_sock setsockopt(IP_MULTICAST_TTL)"); 689 690 return s; 691 } 692 693 694 /* turn off main RIP socket */ 695 void 696 rip_off(void) 697 { 698 struct interface *ifp; 699 naddr addr; 700 701 702 if (rip_sock >= 0 && !mhome) { 703 trace_act("turn off RIP"); 704 705 (void)close(rip_sock); 706 rip_sock = -1; 707 708 /* get non-broadcast sockets to listen to queries. 709 */ 710 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 711 if (ifp->int_state & IS_REMOTE) 712 continue; 713 if (ifp->int_rip_sock < 0) { 714 addr = ((ifp->int_if_flags & IFF_POINTOPOINT) 715 ? ifp->int_dstaddr 716 : ifp->int_addr); 717 ifp->int_rip_sock = get_rip_sock(addr, 0); 718 } 719 } 720 721 fix_select(); 722 723 age(0); 724 } 725 } 726 727 728 /* turn on RIP multicast input via an interface 729 */ 730 static void 731 rip_mcast_on(struct interface *ifp) 732 { 733 struct ip_mreq m; 734 735 if (!IS_RIP_IN_OFF(ifp->int_state) 736 && (ifp->int_if_flags & IFF_MULTICAST) 737 #ifdef MCAST_PPP_BUG 738 && !(ifp->int_if_flags & IFF_POINTOPOINT) 739 #endif 740 && !(ifp->int_state & IS_ALIAS)) { 741 m.imr_multiaddr.s_addr = htonl(INADDR_RIP_GROUP); 742 #ifdef MCAST_IFINDEX 743 m.imr_interface.s_addr = htonl(ifp->int_index); 744 #else 745 m.imr_interface.s_addr = ((ifp->int_if_flags & IFF_POINTOPOINT) 746 ? ifp->int_dstaddr 747 : ifp->int_addr); 748 #endif 749 if (setsockopt(rip_sock,IPPROTO_IP, IP_ADD_MEMBERSHIP, 750 &m, sizeof(m)) < 0) 751 LOGERR("setsockopt(IP_ADD_MEMBERSHIP RIP)"); 752 } 753 } 754 755 756 /* Prepare socket used for RIP. 757 */ 758 void 759 rip_on(struct interface *ifp) 760 { 761 /* If the main RIP socket is already alive, only start receiving 762 * multicasts for this interface. 763 */ 764 if (rip_sock >= 0) { 765 if (ifp != 0) 766 rip_mcast_on(ifp); 767 return; 768 } 769 770 /* If the main RIP socket is off and it makes sense to turn it on, 771 * then turn it on for all of the interfaces. 772 * It makes sense if either router discovery is off, or if 773 * router discover is on and at most one interface is doing RIP. 774 */ 775 if (rip_interfaces > 0 && (!rdisc_ok || rip_interfaces > 1)) { 776 trace_act("turn on RIP"); 777 778 /* Close all of the query sockets so that we can open 779 * the main socket. SO_REUSEPORT is not a solution, 780 * since that would let two daemons bind to the broadcast 781 * socket. 782 */ 783 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 784 if (ifp->int_rip_sock >= 0) { 785 (void)close(ifp->int_rip_sock); 786 ifp->int_rip_sock = -1; 787 } 788 } 789 790 rip_sock = get_rip_sock(INADDR_ANY, 1); 791 rip_sock_mcast = 0; 792 793 /* Do not advertise anything until we have heard something 794 */ 795 if (next_bcast.tv_sec < now.tv_sec+MIN_WAITTIME) 796 next_bcast.tv_sec = now.tv_sec+MIN_WAITTIME; 797 798 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 799 ifp->int_query_time = NEVER; 800 rip_mcast_on(ifp); 801 } 802 ifinit_timer.tv_sec = now.tv_sec; 803 804 } else if (ifp != 0 805 && !(ifp->int_state & IS_REMOTE) 806 && ifp->int_rip_sock < 0) { 807 /* RIP is off, so ensure there are sockets on which 808 * to listen for queries. 809 */ 810 ifp->int_rip_sock = get_rip_sock(ifp->int_addr, 0); 811 } 812 813 fix_select(); 814 } 815 816 817 /* die if malloc(3) fails 818 */ 819 void * 820 rtmalloc(size_t size, 821 const char *msg) 822 { 823 void *p = malloc(size); 824 if (p == 0) 825 logbad(1,"malloc(%lu) failed in %s", (u_long)size, msg); 826 return p; 827 } 828 829 830 /* get a random instant in an interval 831 */ 832 void 833 intvl_random(struct timeval *tp, /* put value here */ 834 u_long lo, /* value is after this second */ 835 u_long hi) /* and before this */ 836 { 837 tp->tv_sec = (time_t)(hi == lo 838 ? lo 839 : (lo + arc4random() % ((hi - lo)))); 840 tp->tv_usec = arc4random() % 1000000; 841 } 842 843 844 void 845 timevaladd(struct timeval *t1, 846 struct timeval *t2) 847 { 848 849 t1->tv_sec += t2->tv_sec; 850 if ((t1->tv_usec += t2->tv_usec) >= 1000000) { 851 t1->tv_sec++; 852 t1->tv_usec -= 1000000; 853 } 854 } 855 856 857 /* t1 = t2 - t3 858 */ 859 static void 860 timevalsub(struct timeval *t1, 861 struct timeval *t2, 862 struct timeval *t3) 863 { 864 t1->tv_sec = t2->tv_sec - t3->tv_sec; 865 if ((t1->tv_usec = t2->tv_usec - t3->tv_usec) < 0) { 866 t1->tv_sec--; 867 t1->tv_usec += 1000000; 868 } 869 } 870 871 872 /* put a message into the system log 873 */ 874 void 875 msglog(const char *p, ...) 876 { 877 va_list args; 878 879 trace_flush(); 880 881 va_start(args, p); 882 vsyslog(LOG_ERR, p, args); 883 va_end(args); 884 885 if (ftrace != 0) { 886 if (ftrace == stdout) 887 (void)fputs("routed: ", ftrace); 888 va_start(args, p); 889 (void)vfprintf(ftrace, p, args); 890 va_end(args); 891 (void)fputc('\n', ftrace); 892 } 893 } 894 895 896 /* Put a message about a bad system into the system log if 897 * we have not complained about it recently. 898 * 899 * It is desirable to complain about all bad systems, but not too often. 900 * In the worst case, it is not practical to keep track of all bad systems. 901 * For example, there can be many systems with the wrong password. 902 */ 903 void 904 msglim(struct msg_limit *lim, naddr addr, const char *p, ...) 905 { 906 va_list args; 907 int i; 908 struct msg_sub *ms1, *ms; 909 const char *p1; 910 911 /* look for the oldest slot in the table 912 * or the slot for the bad router. 913 */ 914 ms = ms1 = lim->subs; 915 for (i = MSG_SUBJECT_N; ; i--, ms1++) { 916 if (i == 0) { 917 /* Reuse a slot at most once every 10 minutes. 918 */ 919 if (lim->reuse > now.tv_sec) { 920 ms = 0; 921 } else { 922 ms = ms1; 923 lim->reuse = now.tv_sec + 10*60; 924 } 925 break; 926 } 927 if (ms->addr == addr) { 928 /* Repeat a complaint about a given system at 929 * most once an hour. 930 */ 931 if (ms->until > now.tv_sec) 932 ms = 0; 933 break; 934 } 935 if (ms->until < ms1->until) 936 ms = ms1; 937 } 938 if (ms != 0) { 939 ms->addr = addr; 940 ms->until = now.tv_sec + 60*60; /* 60 minutes */ 941 942 trace_flush(); 943 for (p1 = p; *p1 == ' '; p1++) 944 continue; 945 va_start(args, p); 946 vsyslog(LOG_ERR, p1, args); 947 va_end(args); 948 } 949 950 /* always display the message if tracing */ 951 if (ftrace != 0) { 952 va_start(args, p); 953 (void)vfprintf(ftrace, p, args); 954 (void)fputc('\n', ftrace); 955 va_end(args); 956 } 957 } 958 959 960 void 961 logbad(int dump, const char *p, ...) 962 { 963 va_list args; 964 965 trace_flush(); 966 967 va_start(args, p); 968 vsyslog(LOG_ERR, p, args); 969 va_end(args); 970 971 (void)fputs("routed: ", stderr); 972 va_start(args, p); 973 (void)vfprintf(stderr, p, args); 974 va_end(args); 975 (void)fputs("; giving up\n",stderr); 976 (void)fflush(stderr); 977 978 if (dump) 979 abort(); 980 exit(1); 981 } 982