1 /* $NetBSD: main.c,v 1.24 2000/03/02 20:59:40 christos 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 #if !defined(lint) && !defined(sgi) && !defined(__NetBSD__) 37 static char sccsid[] __attribute__((unused)) = "@(#)main.c 8.1 (Berkeley) 6/5/93"; 38 #define __COPYRIGHT(a) char copyright[] = a; 39 #elif defined(__NetBSD__) 40 #include <sys/cdefs.h> 41 __RCSID("$NetBSD: main.c,v 1.24 2000/03/02 20:59:40 christos Exp $"); 42 #endif 43 __COPYRIGHT("@(#) Copyright (c) 1983, 1988, 1993\n\ 44 The Regents of the University of California. All rights reserved.\n"); 45 46 #include "defs.h" 47 #include "pathnames.h" 48 #ifdef sgi 49 #include "math.h" 50 #endif 51 #include <signal.h> 52 #include <fcntl.h> 53 #include <sys/file.h> 54 55 #if defined(__NetBSD__) 56 #include <util.h> 57 #endif 58 59 pid_t mypid; 60 61 naddr myaddr; /* system address */ 62 char myname[MAXHOSTNAMELEN+1]; 63 64 int verbose; 65 66 int supplier; /* supply or broadcast updates */ 67 int supplier_set; 68 int ipforwarding = 1; /* kernel forwarding on */ 69 70 int default_gateway; /* 1=advertise default */ 71 int background = 1; 72 int ridhosts; /* 1=reduce host routes */ 73 int mhome; /* 1=want multi-homed host route */ 74 int advertise_mhome; /* 1=must continue advertising it */ 75 int auth_ok = 1; /* 1=ignore auth if we do not care */ 76 77 struct timeval epoch; /* when started */ 78 struct timeval clk, prev_clk; 79 static int usec_fudge; 80 struct timeval now; /* current idea of time */ 81 time_t now_stale; 82 time_t now_expire; 83 time_t now_garbage; 84 85 struct timeval next_bcast; /* next general broadcast */ 86 struct timeval no_flash = {EPOCH+SUPPLY_INTERVAL}; /* inhibit flash update */ 87 88 struct timeval flush_kern_timer; 89 90 fd_set fdbits; 91 int sock_max; 92 int rip_sock = -1; /* RIP socket */ 93 struct interface *rip_sock_mcast; /* current multicast interface */ 94 int rt_sock; /* routing socket */ 95 int rt_sock_seqno; 96 97 98 static int get_rip_sock(naddr, int); 99 static void timevalsub(struct timeval *, struct timeval *, struct timeval *); 100 101 int 102 main(int argc, 103 char *argv[]) 104 { 105 int n, mib[4], off; 106 size_t len; 107 char *p, *q; 108 const char *cp; 109 struct timeval wtime, t2; 110 time_t dt; 111 fd_set ibits; 112 naddr p_net, p_mask; 113 struct interface *ifp; 114 struct parm parm; 115 char *tracename = 0; 116 117 118 /* Some shells are badly broken and send SIGHUP to backgrounded 119 * processes. 120 */ 121 signal(SIGHUP, SIG_IGN); 122 123 openlog("routed", LOG_PID | LOG_ODELAY, LOG_DAEMON); 124 ftrace = stdout; 125 126 gettimeofday(&clk, 0); 127 prev_clk = clk; 128 epoch = clk; 129 epoch.tv_sec -= EPOCH; 130 now.tv_sec = EPOCH; 131 now_stale = EPOCH - STALE_TIME; 132 now_expire = EPOCH - EXPIRE_TIME; 133 now_garbage = EPOCH - GARBAGE_TIME; 134 wtime.tv_sec = 0; 135 136 (void)gethostname(myname, sizeof(myname) - 1); 137 (void)gethost(myname, &myaddr); 138 139 while ((n = getopt(argc, argv, "sqdghmpAtvT:F:P:")) != -1) { 140 switch (n) { 141 case 's': 142 supplier = 1; 143 supplier_set = 1; 144 break; 145 146 case 'q': 147 supplier = 0; 148 supplier_set = 1; 149 break; 150 151 case 'd': 152 background = 0; 153 break; 154 155 case 'g': 156 memset(&parm, 0, sizeof(parm)); 157 parm.parm_d_metric = 1; 158 cp = check_parms(&parm); 159 if (cp != 0) 160 msglog("bad -g: %s", cp); 161 else 162 default_gateway = 1; 163 break; 164 165 case 'h': /* suppress extra host routes */ 166 ridhosts = 1; 167 break; 168 169 case 'm': /* advertise host route */ 170 mhome = 1; /* on multi-homed hosts */ 171 break; 172 173 case 'A': 174 /* Ignore authentication if we do not care. 175 * Crazy as it is, that is what RFC 1723 requires. 176 */ 177 auth_ok = 0; 178 break; 179 180 case 't': 181 new_tracelevel++; 182 break; 183 184 case 'T': 185 tracename = optarg; 186 break; 187 188 case 'F': /* minimal routes for SLIP */ 189 n = FAKE_METRIC; 190 p = strchr(optarg,','); 191 if (p && *p != '\0') { 192 n = (int)strtoul(p+1, &q, 0); 193 if (*q == '\0' 194 && n <= HOPCNT_INFINITY-1 195 && n >= 1) 196 *p = '\0'; 197 } 198 if (!getnet(optarg, &p_net, &p_mask)) { 199 msglog("bad network; \"-F %s\"", 200 optarg); 201 break; 202 } 203 memset(&parm, 0, sizeof(parm)); 204 parm.parm_net = p_net; 205 parm.parm_mask = p_mask; 206 parm.parm_d_metric = n; 207 cp = check_parms(&parm); 208 if (cp != 0) 209 msglog("bad -F: %s", cp); 210 break; 211 212 case 'P': 213 /* handle arbitrary parameters. 214 */ 215 q = strdup(optarg); 216 cp = parse_parms(q, 0); 217 if (cp != 0) 218 msglog("%s in \"-P %s\"", cp, optarg); 219 free(q); 220 break; 221 222 case 'v': 223 /* display version */ 224 verbose++; 225 msglog("version 2.19"); 226 break; 227 228 default: 229 goto usage; 230 } 231 } 232 argc -= optind; 233 argv += optind; 234 235 if (tracename == 0 && argc >= 1) { 236 tracename = *argv++; 237 argc--; 238 } 239 if (tracename != 0 && tracename[0] == '\0') 240 goto usage; 241 if (argc != 0) { 242 usage: 243 logbad(0, "usage: routed [-sqdghmpAtv] [-T tracefile]" 244 " [-F net[,metric]] [-P parms]"); 245 } 246 if (geteuid() != 0) { 247 if (verbose) 248 exit(0); 249 logbad(0, "requires UID 0"); 250 } 251 252 mib[0] = CTL_NET; 253 mib[1] = PF_INET; 254 mib[2] = IPPROTO_IP; 255 mib[3] = IPCTL_FORWARDING; 256 len = sizeof(ipforwarding); 257 if (sysctl(mib, 4, &ipforwarding, &len, 0, 0) < 0) 258 LOGERR("sysctl(IPCTL_FORWARDING)"); 259 260 if (!ipforwarding) { 261 if (supplier) 262 msglog("-s incompatible with ipforwarding=0"); 263 if (default_gateway) { 264 msglog("-g incompatible with ipforwarding=0"); 265 default_gateway = 0; 266 } 267 supplier = 0; 268 supplier_set = 1; 269 } 270 if (default_gateway) { 271 if (supplier_set && !supplier) { 272 msglog("-g and -q incompatible"); 273 } else { 274 supplier = 1; 275 supplier_set = 1; 276 } 277 } 278 279 280 signal(SIGALRM, sigalrm); 281 if (!background) 282 signal(SIGHUP, sigterm); /* SIGHUP fatal during debugging */ 283 signal(SIGTERM, sigterm); 284 signal(SIGINT, sigterm); 285 signal(SIGUSR1, sigtrace_on); 286 signal(SIGUSR2, sigtrace_off); 287 288 /* get into the background */ 289 #ifdef sgi 290 if (0 > _daemonize(background ? 0 : (_DF_NOCHDIR|_DF_NOFORK), 291 STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO)) 292 BADERR(0, "_daemonize()"); 293 #else 294 if (background && daemon(0, 1) < 0) 295 BADERR(0,"daemon()"); 296 #endif 297 298 #if defined(__NetBSD__) 299 pidfile(NULL); 300 #endif 301 mypid = getpid(); 302 srandom((int)(clk.tv_sec ^ clk.tv_usec ^ mypid)); 303 304 /* prepare socket connected to the kernel. 305 */ 306 rt_sock = socket(AF_ROUTE, SOCK_RAW, 0); 307 if (rt_sock < 0) 308 BADERR(1,"rt_sock = socket()"); 309 if (fcntl(rt_sock, F_SETFL, O_NONBLOCK) == -1) 310 logbad(1, "fcntl(rt_sock) O_NONBLOCK: %s", strerror(errno)); 311 off = 0; 312 if (setsockopt(rt_sock, SOL_SOCKET,SO_USELOOPBACK, 313 &off,sizeof(off)) < 0) 314 LOGERR("setsockopt(SO_USELOOPBACK,0)"); 315 316 fix_select(); 317 318 319 if (tracename != 0) { 320 strncpy(inittracename, tracename, sizeof(inittracename)-1); 321 set_tracefile(inittracename, "%s", -1); 322 } else { 323 tracelevel_msg("%s", -1); /* turn on tracing to stdio */ 324 } 325 326 bufinit(); 327 328 /* initialize radix tree */ 329 rtinit(); 330 331 /* Pick a random part of the second for our output to minimize 332 * collisions. 333 * 334 * Start broadcasting after hearing from other routers, and 335 * at a random time so a bunch of systems do not get synchronized 336 * after a power failure. 337 */ 338 intvl_random(&next_bcast, EPOCH+MIN_WAITTIME, EPOCH+SUPPLY_INTERVAL); 339 age_timer.tv_usec = next_bcast.tv_usec; 340 age_timer.tv_sec = EPOCH+MIN_WAITTIME; 341 rdisc_timer = next_bcast; 342 ifinit_timer.tv_usec = next_bcast.tv_usec; 343 344 /* Collect an initial view of the world by checking the interface 345 * configuration and the kludge file. 346 */ 347 gwkludge(); 348 ifinit(); 349 350 /* Ask for routes */ 351 rip_query(); 352 rdisc_sol(); 353 354 /* Now turn off stdio if not tracing */ 355 if (new_tracelevel == 0) 356 trace_close(background); 357 358 /* Loop forever, listening and broadcasting. 359 */ 360 for (;;) { 361 prev_clk = clk; 362 gettimeofday(&clk, 0); 363 if (prev_clk.tv_sec == clk.tv_sec 364 && prev_clk.tv_usec == clk.tv_usec+usec_fudge) { 365 /* Much of `routed` depends on time always advancing. 366 * On systems that do not guarantee that gettimeofday() 367 * produces unique timestamps even if called within 368 * a single tick, use trickery like that in classic 369 * BSD kernels. 370 */ 371 clk.tv_usec += ++usec_fudge; 372 373 } else { 374 usec_fudge = 0; 375 376 timevalsub(&t2, &clk, &prev_clk); 377 if (t2.tv_sec < 0 378 || t2.tv_sec > wtime.tv_sec + 5) { 379 /* Deal with time changes before other 380 * housekeeping to keep everything straight. 381 */ 382 dt = t2.tv_sec; 383 if (dt > 0) 384 dt -= wtime.tv_sec; 385 trace_act("time changed by %d sec", (int)dt); 386 epoch.tv_sec += dt; 387 } 388 } 389 timevalsub(&now, &clk, &epoch); 390 now_stale = now.tv_sec - STALE_TIME; 391 now_expire = now.tv_sec - EXPIRE_TIME; 392 now_garbage = now.tv_sec - GARBAGE_TIME; 393 394 /* deal with signals that should affect tracing */ 395 set_tracelevel(); 396 397 if (stopint != 0) { 398 rip_bcast(0); 399 rdisc_adv(); 400 trace_off("exiting with signal %d", stopint); 401 exit(stopint | 128); 402 } 403 404 /* look for new or dead interfaces */ 405 timevalsub(&wtime, &ifinit_timer, &now); 406 if (wtime.tv_sec <= 0) { 407 wtime.tv_sec = 0; 408 ifinit(); 409 rip_query(); 410 continue; 411 } 412 413 /* Check the kernel table occassionally for mysteriously 414 * evaporated routes 415 */ 416 timevalsub(&t2, &flush_kern_timer, &now); 417 if (t2.tv_sec <= 0) { 418 flush_kern(); 419 flush_kern_timer.tv_sec = (now.tv_sec 420 + CHECK_QUIET_INTERVAL); 421 continue; 422 } 423 if (timercmp(&t2, &wtime, <)) 424 wtime = t2; 425 426 /* If it is time, then broadcast our routes. 427 */ 428 if (supplier || advertise_mhome) { 429 timevalsub(&t2, &next_bcast, &now); 430 if (t2.tv_sec <= 0) { 431 /* Synchronize the aging and broadcast 432 * timers to minimize awakenings 433 */ 434 age(0); 435 436 rip_bcast(0); 437 438 /* It is desirable to send routing updates 439 * regularly. So schedule the next update 440 * 30 seconds after the previous one was 441 * scheduled, instead of 30 seconds after 442 * the previous update was finished. 443 * Even if we just started after discovering 444 * a 2nd interface or were otherwise delayed, 445 * pick a 30-second aniversary of the 446 * original broadcast time. 447 */ 448 n = 1 + (0-t2.tv_sec)/SUPPLY_INTERVAL; 449 next_bcast.tv_sec += n*SUPPLY_INTERVAL; 450 451 continue; 452 } 453 454 if (timercmp(&t2, &wtime, <)) 455 wtime = t2; 456 } 457 458 /* If we need a flash update, either do it now or 459 * set the delay to end when it is time. 460 * 461 * If we are within MIN_WAITTIME seconds of a full update, 462 * do not bother. 463 */ 464 if (need_flash 465 && supplier 466 && no_flash.tv_sec+MIN_WAITTIME < next_bcast.tv_sec) { 467 /* accurate to the millisecond */ 468 if (!timercmp(&no_flash, &now, >)) 469 rip_bcast(1); 470 timevalsub(&t2, &no_flash, &now); 471 if (timercmp(&t2, &wtime, <)) 472 wtime = t2; 473 } 474 475 /* trigger the main aging timer. 476 */ 477 timevalsub(&t2, &age_timer, &now); 478 if (t2.tv_sec <= 0) { 479 age(0); 480 continue; 481 } 482 if (timercmp(&t2, &wtime, <)) 483 wtime = t2; 484 485 /* update the kernel routing table 486 */ 487 timevalsub(&t2, &need_kern, &now); 488 if (t2.tv_sec <= 0) { 489 age(0); 490 continue; 491 } 492 if (timercmp(&t2, &wtime, <)) 493 wtime = t2; 494 495 /* take care of router discovery, 496 * but do it in the correct the millisecond 497 */ 498 if (!timercmp(&rdisc_timer, &now, >)) { 499 rdisc_age(0); 500 continue; 501 } 502 timevalsub(&t2, &rdisc_timer, &now); 503 if (timercmp(&t2, &wtime, <)) 504 wtime = t2; 505 506 507 /* wait for input or a timer to expire. 508 */ 509 trace_flush(); 510 ibits = fdbits; 511 n = select(sock_max, &ibits, 0, 0, &wtime); 512 if (n <= 0) { 513 if (n < 0 && errno != EINTR && errno != EAGAIN) 514 BADERR(1,"select"); 515 continue; 516 } 517 518 if (FD_ISSET(rt_sock, &ibits)) { 519 read_rt(); 520 n--; 521 } 522 if (rdisc_sock >= 0 && FD_ISSET(rdisc_sock, &ibits)) { 523 read_d(); 524 n--; 525 } 526 if (rip_sock >= 0 && FD_ISSET(rip_sock, &ibits)) { 527 read_rip(rip_sock, 0); 528 n--; 529 } 530 531 for (ifp = ifnet; n > 0 && 0 != ifp; ifp = ifp->int_next) { 532 if (ifp->int_rip_sock >= 0 533 && FD_ISSET(ifp->int_rip_sock, &ibits)) { 534 read_rip(ifp->int_rip_sock, ifp); 535 n--; 536 } 537 } 538 } 539 } 540 541 542 /* ARGSUSED */ 543 void 544 sigalrm(int s UNUSED) 545 { 546 /* Historically, SIGALRM would cause the daemon to check for 547 * new and broken interfaces. 548 */ 549 ifinit_timer.tv_sec = now.tv_sec; 550 trace_act("SIGALRM"); 551 } 552 553 554 /* watch for fatal signals */ 555 void 556 sigterm(int sig) 557 { 558 stopint = sig; 559 (void)signal(sig, SIG_DFL); /* catch it only once */ 560 } 561 562 563 void 564 fix_select(void) 565 { 566 struct interface *ifp; 567 568 569 FD_ZERO(&fdbits); 570 sock_max = 0; 571 572 FD_SET(rt_sock, &fdbits); 573 if (sock_max <= rt_sock) 574 sock_max = rt_sock+1; 575 if (rip_sock >= 0) { 576 FD_SET(rip_sock, &fdbits); 577 if (sock_max <= rip_sock) 578 sock_max = rip_sock+1; 579 } 580 for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) { 581 if (ifp->int_rip_sock >= 0) { 582 FD_SET(ifp->int_rip_sock, &fdbits); 583 if (sock_max <= ifp->int_rip_sock) 584 sock_max = ifp->int_rip_sock+1; 585 } 586 } 587 if (rdisc_sock >= 0) { 588 FD_SET(rdisc_sock, &fdbits); 589 if (sock_max <= rdisc_sock) 590 sock_max = rdisc_sock+1; 591 } 592 } 593 594 595 void 596 fix_sock(int sock, 597 const char *name) 598 { 599 int on; 600 #define MIN_SOCKBUF (4*1024) 601 static int rbuf; 602 603 if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1) 604 logbad(1, "fcntl(%s) O_NONBLOCK: %s", 605 name, strerror(errno)); 606 on = 1; 607 if (setsockopt(sock, SOL_SOCKET,SO_BROADCAST, &on,sizeof(on)) < 0) 608 msglog("setsockopt(%s,SO_BROADCAST): %s", 609 name, strerror(errno)); 610 #ifdef USE_PASSIFNAME 611 on = 1; 612 if (setsockopt(sock, SOL_SOCKET, SO_PASSIFNAME, &on,sizeof(on)) < 0) 613 msglog("setsockopt(%s,SO_PASSIFNAME): %s", 614 name, strerror(errno)); 615 #endif 616 617 if (rbuf >= MIN_SOCKBUF) { 618 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, 619 &rbuf, sizeof(rbuf)) < 0) 620 msglog("setsockopt(%s,SO_RCVBUF=%d): %s", 621 name, rbuf, strerror(errno)); 622 } else { 623 for (rbuf = 60*1024; ; rbuf -= 4096) { 624 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, 625 &rbuf, sizeof(rbuf)) == 0) { 626 trace_act("RCVBUF=%d", rbuf); 627 break; 628 } 629 if (rbuf < MIN_SOCKBUF) { 630 msglog("setsockopt(%s,SO_RCVBUF = %d): %s", 631 name, rbuf, strerror(errno)); 632 break; 633 } 634 } 635 } 636 } 637 638 639 /* get a rip socket 640 */ 641 static int /* <0 or file descriptor */ 642 get_rip_sock(naddr addr, 643 int serious) /* 1=failure to bind is serious */ 644 { 645 struct sockaddr_in sin; 646 unsigned char ttl; 647 int s; 648 649 650 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) 651 BADERR(1,"rip_sock = socket()"); 652 653 memset(&sin, 0, sizeof(sin)); 654 #ifdef _HAVE_SIN_LEN 655 sin.sin_len = sizeof(sin); 656 #endif 657 sin.sin_family = AF_INET; 658 sin.sin_port = htons(RIP_PORT); 659 sin.sin_addr.s_addr = addr; 660 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 661 if (serious) 662 BADERR(errno != EADDRINUSE, "bind(rip_sock)"); 663 return -1; 664 } 665 fix_sock(s,"rip_sock"); 666 667 ttl = 1; 668 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, 669 &ttl, sizeof(ttl)) < 0) 670 DBGERR(1,"rip_sock setsockopt(IP_MULTICAST_TTL)"); 671 672 return s; 673 } 674 675 676 /* turn off main RIP socket */ 677 void 678 rip_off(void) 679 { 680 struct interface *ifp; 681 naddr addr; 682 683 684 if (rip_sock >= 0 && !mhome) { 685 trace_act("turn off RIP"); 686 687 (void)close(rip_sock); 688 rip_sock = -1; 689 690 /* get non-broadcast sockets to listen to queries. 691 */ 692 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 693 if (ifp->int_state & IS_REMOTE) 694 continue; 695 if (ifp->int_rip_sock < 0) { 696 addr = ((ifp->int_if_flags & IFF_POINTOPOINT) 697 ? ifp->int_dstaddr 698 : ifp->int_addr); 699 ifp->int_rip_sock = get_rip_sock(addr, 0); 700 } 701 } 702 703 fix_select(); 704 705 age(0); 706 } 707 } 708 709 710 /* turn on RIP multicast input via an interface 711 */ 712 static void 713 rip_mcast_on(struct interface *ifp) 714 { 715 struct ip_mreq m; 716 717 if (!IS_RIP_IN_OFF(ifp->int_state) 718 && (ifp->int_if_flags & IFF_MULTICAST) 719 #ifdef MCAST_PPP_BUG 720 && !(ifp->int_if_flags & IFF_POINTOPOINT) 721 #endif 722 && !(ifp->int_state & IS_ALIAS)) { 723 m.imr_multiaddr.s_addr = htonl(INADDR_RIP_GROUP); 724 m.imr_interface.s_addr = ((ifp->int_if_flags & IFF_POINTOPOINT) 725 ? ifp->int_dstaddr 726 : ifp->int_addr); 727 if (setsockopt(rip_sock,IPPROTO_IP, IP_ADD_MEMBERSHIP, 728 &m, sizeof(m)) < 0) 729 LOGERR("setsockopt(IP_ADD_MEMBERSHIP RIP)"); 730 } 731 } 732 733 734 /* Prepare socket used for RIP. 735 */ 736 void 737 rip_on(struct interface *ifp) 738 { 739 /* If the main RIP socket is already alive, only start receiving 740 * multicasts for this interface. 741 */ 742 if (rip_sock >= 0) { 743 if (ifp != 0) 744 rip_mcast_on(ifp); 745 return; 746 } 747 748 /* If the main RIP socket is off and it makes sense to turn it on, 749 * then turn it on for all of the interfaces. 750 * It makes sense if either router discovery is off, or if 751 * router discover is on and at most one interface is doing RIP. 752 */ 753 if (rip_interfaces > 0 && (!rdisc_ok || rip_interfaces > 1)) { 754 trace_act("turn on RIP"); 755 756 /* Close all of the query sockets so that we can open 757 * the main socket. SO_REUSEPORT is not a solution, 758 * since that would let two daemons bind to the broadcast 759 * socket. 760 */ 761 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 762 if (ifp->int_rip_sock >= 0) { 763 (void)close(ifp->int_rip_sock); 764 ifp->int_rip_sock = -1; 765 } 766 } 767 768 rip_sock = get_rip_sock(INADDR_ANY, 1); 769 rip_sock_mcast = 0; 770 771 /* Do not advertise anything until we have heard something 772 */ 773 if (next_bcast.tv_sec < now.tv_sec+MIN_WAITTIME) 774 next_bcast.tv_sec = now.tv_sec+MIN_WAITTIME; 775 776 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 777 ifp->int_query_time = NEVER; 778 rip_mcast_on(ifp); 779 } 780 ifinit_timer.tv_sec = now.tv_sec; 781 782 } else if (ifp != 0 783 && !(ifp->int_state & IS_REMOTE) 784 && ifp->int_rip_sock < 0) { 785 /* RIP is off, so ensure there are sockets on which 786 * to listen for queries. 787 */ 788 ifp->int_rip_sock = get_rip_sock(ifp->int_addr, 0); 789 } 790 791 fix_select(); 792 } 793 794 795 /* die if malloc(3) fails 796 */ 797 void * 798 rtmalloc(size_t size, 799 const char *msg) 800 { 801 void *p = malloc(size); 802 if (p == 0) 803 logbad(1,"malloc(%lu) failed in %s", (u_long)size, msg); 804 return p; 805 } 806 807 808 /* get a random instant in an interval 809 */ 810 void 811 intvl_random(struct timeval *tp, /* put value here */ 812 u_long lo, /* value is after this second */ 813 u_long hi) /* and before this */ 814 { 815 tp->tv_sec = (time_t)(hi == lo 816 ? lo 817 : (lo + random() % ((hi - lo)))); 818 tp->tv_usec = random() % 1000000; 819 } 820 821 822 void 823 timevaladd(struct timeval *t1, 824 struct timeval *t2) 825 { 826 827 t1->tv_sec += t2->tv_sec; 828 if ((t1->tv_usec += t2->tv_usec) >= 1000000) { 829 t1->tv_sec++; 830 t1->tv_usec -= 1000000; 831 } 832 } 833 834 835 /* t1 = t2 - t3 836 */ 837 static void 838 timevalsub(struct timeval *t1, 839 struct timeval *t2, 840 struct timeval *t3) 841 { 842 t1->tv_sec = t2->tv_sec - t3->tv_sec; 843 if ((t1->tv_usec = t2->tv_usec - t3->tv_usec) < 0) { 844 t1->tv_sec--; 845 t1->tv_usec += 1000000; 846 } 847 } 848 849 850 /* put a message into the system log 851 */ 852 void 853 msglog(const char *p, ...) 854 { 855 va_list args; 856 857 trace_flush(); 858 859 va_start(args, p); 860 vsyslog(LOG_ERR, p, args); 861 862 if (ftrace != 0) { 863 if (ftrace == stdout) 864 (void)fputs("routed: ", ftrace); 865 (void)vfprintf(ftrace, p, args); 866 (void)fputc('\n', ftrace); 867 } 868 } 869 870 871 /* Put a message about a bad system into the system log if 872 * we have not complained about it recently. 873 * 874 * It is desirable to complain about all bad systems, but not too often. 875 * In the worst case, it is not practical to keep track of all bad systems. 876 * For example, there can be many systems with the wrong password. 877 */ 878 void 879 msglim(struct msg_limit *lim, naddr addr, const char *p, ...) 880 { 881 va_list args; 882 int i; 883 struct msg_sub *ms1, *ms; 884 const char *p1; 885 886 va_start(args, p); 887 888 /* look for the oldest slot in the table 889 * or the slot for the bad router. 890 */ 891 ms = ms1 = lim->subs; 892 for (i = MSG_SUBJECT_N; ; i--, ms1++) { 893 if (i == 0) { 894 /* Reuse a slot at most once every 10 minutes. 895 */ 896 if (lim->reuse > now.tv_sec) { 897 ms = 0; 898 } else { 899 ms = ms1; 900 lim->reuse = now.tv_sec + 10*60; 901 } 902 break; 903 } 904 if (ms->addr == addr) { 905 /* Repeat a complaint about a given system at 906 * most once an hour. 907 */ 908 if (ms->until > now.tv_sec) 909 ms = 0; 910 break; 911 } 912 if (ms->until < ms1->until) 913 ms = ms1; 914 } 915 if (ms != 0) { 916 ms->addr = addr; 917 ms->until = now.tv_sec + 60*60; /* 60 minutes */ 918 919 trace_flush(); 920 for (p1 = p; *p1 == ' '; p1++) 921 continue; 922 vsyslog(LOG_ERR, p1, args); 923 } 924 925 /* always display the message if tracing */ 926 if (ftrace != 0) { 927 (void)vfprintf(ftrace, p, args); 928 (void)fputc('\n', ftrace); 929 } 930 } 931 932 933 void 934 logbad(int dump, const char *p, ...) 935 { 936 va_list args; 937 938 trace_flush(); 939 940 va_start(args, p); 941 vsyslog(LOG_ERR, p, args); 942 943 (void)fputs("routed: ", stderr); 944 (void)vfprintf(stderr, p, args); 945 (void)fputs("; giving up\n",stderr); 946 (void)fflush(stderr); 947 948 if (dump) 949 abort(); 950 exit(1); 951 } 952