1 /* $NetBSD: main.c,v 1.22 1999/02/25 10:56:47 ross 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 1.22 1999/02/25 10:56:47 ross 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 pid_t mypid; 56 57 naddr myaddr; /* system address */ 58 char myname[MAXHOSTNAMELEN+1]; 59 60 int verbose; 61 62 int supplier; /* supply or broadcast updates */ 63 int supplier_set; 64 int ipforwarding = 1; /* kernel forwarding on */ 65 66 int default_gateway; /* 1=advertise default */ 67 int background = 1; 68 int ridhosts; /* 1=reduce host routes */ 69 int mhome; /* 1=want multi-homed host route */ 70 int advertise_mhome; /* 1=must continue advertising it */ 71 int auth_ok = 1; /* 1=ignore auth if we do not care */ 72 73 struct timeval epoch; /* when started */ 74 struct timeval clk, prev_clk; 75 struct timeval now; /* current idea of time */ 76 time_t now_stale; 77 time_t now_expire; 78 time_t now_garbage; 79 80 struct timeval next_bcast; /* next general broadcast */ 81 struct timeval no_flash = {EPOCH+SUPPLY_INTERVAL}; /* inhibit flash update */ 82 83 struct timeval flush_kern_timer; 84 85 fd_set fdbits; 86 int sock_max; 87 int rip_sock = -1; /* RIP socket */ 88 struct interface *rip_sock_mcast; /* current multicast interface */ 89 int rt_sock; /* routing socket */ 90 int rt_sock_seqno; 91 92 93 static int get_rip_sock(naddr, int); 94 static void timevalsub(struct timeval *, struct timeval *, struct timeval *); 95 96 int 97 main(int argc, 98 char *argv[]) 99 { 100 int n, mib[4], off; 101 size_t len; 102 char *p, *q; 103 const char *cp; 104 struct timeval wtime, t2; 105 time_t dt; 106 fd_set ibits; 107 naddr p_net, p_mask; 108 struct interface *ifp; 109 struct parm parm; 110 char *tracename = 0; 111 112 113 /* Some shells are badly broken and send SIGHUP to backgrounded 114 * processes. 115 */ 116 signal(SIGHUP, SIG_IGN); 117 118 openlog("routed", LOG_PID | LOG_ODELAY, LOG_DAEMON); 119 ftrace = stdout; 120 121 gettimeofday(&clk, 0); 122 prev_clk = clk; 123 epoch = clk; 124 epoch.tv_sec -= EPOCH; 125 now.tv_sec = EPOCH; 126 now_stale = EPOCH - STALE_TIME; 127 now_expire = EPOCH - EXPIRE_TIME; 128 now_garbage = EPOCH - GARBAGE_TIME; 129 wtime.tv_sec = 0; 130 131 (void)gethostname(myname, sizeof(myname)); 132 myname[sizeof(myname) - 1] = '\0'; 133 (void)gethost(myname, &myaddr); 134 135 while ((n = getopt(argc, argv, "sqdghmpAtvT:F:P:")) != -1) { 136 switch (n) { 137 case 's': 138 supplier = 1; 139 supplier_set = 1; 140 break; 141 142 case 'q': 143 supplier = 0; 144 supplier_set = 1; 145 break; 146 147 case 'd': 148 background = 0; 149 break; 150 151 case 'g': 152 memset(&parm, 0, sizeof(parm)); 153 parm.parm_d_metric = 1; 154 cp = check_parms(&parm); 155 if (cp != 0) 156 msglog("bad -g: %s", cp); 157 else 158 default_gateway = 1; 159 break; 160 161 case 'h': /* suppress extra host routes */ 162 ridhosts = 1; 163 break; 164 165 case 'm': /* advertise host route */ 166 mhome = 1; /* on multi-homed hosts */ 167 break; 168 169 case 'A': 170 /* Ignore authentication if we do not care. 171 * Crazy as it is, that is what RFC 1723 requires. 172 */ 173 auth_ok = 0; 174 break; 175 176 case 't': 177 new_tracelevel++; 178 break; 179 180 case 'T': 181 tracename = optarg; 182 break; 183 184 case 'F': /* minimal routes for SLIP */ 185 n = FAKE_METRIC; 186 p = strchr(optarg,','); 187 if (p && *p != '\0') { 188 n = (int)strtoul(p+1, &q, 0); 189 if (*q == '\0' 190 && n <= HOPCNT_INFINITY-1 191 && n >= 1) 192 *p = '\0'; 193 } 194 if (!getnet(optarg, &p_net, &p_mask)) { 195 msglog("bad network; \"-F %s\"", 196 optarg); 197 break; 198 } 199 memset(&parm, 0, sizeof(parm)); 200 parm.parm_net = p_net; 201 parm.parm_mask = p_mask; 202 parm.parm_d_metric = n; 203 cp = check_parms(&parm); 204 if (cp != 0) 205 msglog("bad -F: %s", cp); 206 break; 207 208 case 'P': 209 /* handle arbitrary parameters. 210 */ 211 q = strdup(optarg); 212 cp = parse_parms(q, 0); 213 if (cp != 0) 214 msglog("%s in \"-P %s\"", cp, optarg); 215 free(q); 216 break; 217 218 case 'v': 219 /* display version */ 220 verbose++; 221 msglog("version 2.16"); 222 break; 223 224 default: 225 goto usage; 226 } 227 } 228 argc -= optind; 229 argv += optind; 230 231 if (tracename == 0 && argc >= 1) { 232 tracename = *argv++; 233 argc--; 234 } 235 if (tracename != 0 && tracename[0] == '\0') 236 goto usage; 237 if (argc != 0) { 238 usage: 239 logbad(0, "usage: routed [-sqdghmpAtv] [-T tracefile]" 240 " [-F net[,metric]] [-P parms]"); 241 } 242 if (geteuid() != 0) { 243 if (verbose) 244 exit(0); 245 logbad(0, "requires UID 0"); 246 } 247 248 mib[0] = CTL_NET; 249 mib[1] = PF_INET; 250 mib[2] = IPPROTO_IP; 251 mib[3] = IPCTL_FORWARDING; 252 len = sizeof(ipforwarding); 253 if (sysctl(mib, 4, &ipforwarding, &len, 0, 0) < 0) 254 LOGERR("sysctl(IPCTL_FORWARDING)"); 255 256 if (!ipforwarding) { 257 if (supplier) 258 msglog("-s incompatible with ipforwarding=0"); 259 if (default_gateway) { 260 msglog("-g incompatible with ipforwarding=0"); 261 default_gateway = 0; 262 } 263 supplier = 0; 264 supplier_set = 1; 265 } 266 if (default_gateway) { 267 if (supplier_set && !supplier) { 268 msglog("-g and -q incompatible"); 269 } else { 270 supplier = 1; 271 supplier_set = 1; 272 } 273 } 274 275 276 signal(SIGALRM, sigalrm); 277 if (!background) 278 signal(SIGHUP, sigterm); /* SIGHUP fatal during debugging */ 279 signal(SIGTERM, sigterm); 280 signal(SIGINT, sigterm); 281 signal(SIGUSR1, sigtrace_on); 282 signal(SIGUSR2, sigtrace_off); 283 284 /* get into the background */ 285 #ifdef sgi 286 if (0 > _daemonize(background ? 0 : (_DF_NOCHDIR|_DF_NOFORK), 287 STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO)) 288 BADERR(0, "_daemonize()"); 289 #else 290 if (background && daemon(0, 1) < 0) 291 BADERR(0,"daemon()"); 292 #endif 293 294 mypid = getpid(); 295 srandom((int)(clk.tv_sec ^ clk.tv_usec ^ mypid)); 296 297 /* prepare socket connected to the kernel. 298 */ 299 rt_sock = socket(AF_ROUTE, SOCK_RAW, 0); 300 if (rt_sock < 0) 301 BADERR(1,"rt_sock = socket()"); 302 if (fcntl(rt_sock, F_SETFL, O_NONBLOCK) == -1) 303 logbad(1, "fcntl(rt_sock) O_NONBLOCK: %s", strerror(errno)); 304 off = 0; 305 if (setsockopt(rt_sock, SOL_SOCKET,SO_USELOOPBACK, 306 &off,sizeof(off)) < 0) 307 LOGERR("setsockopt(SO_USELOOPBACK,0)"); 308 309 fix_select(); 310 311 312 if (tracename != 0) { 313 strncpy(inittracename, tracename, sizeof(inittracename)-1); 314 set_tracefile(inittracename, "%s", -1); 315 } else { 316 tracelevel_msg("%s", -1); /* turn on tracing to stdio */ 317 } 318 319 bufinit(); 320 321 /* initialize radix tree */ 322 rtinit(); 323 324 /* Pick a random part of the second for our output to minimize 325 * collisions. 326 * 327 * Start broadcasting after hearing from other routers, and 328 * at a random time so a bunch of systems do not get synchronized 329 * after a power failure. 330 */ 331 intvl_random(&next_bcast, EPOCH+MIN_WAITTIME, EPOCH+SUPPLY_INTERVAL); 332 age_timer.tv_usec = next_bcast.tv_usec; 333 age_timer.tv_sec = EPOCH+MIN_WAITTIME; 334 rdisc_timer = next_bcast; 335 ifinit_timer.tv_usec = next_bcast.tv_usec; 336 337 /* Collect an initial view of the world by checking the interface 338 * configuration and the kludge file. 339 */ 340 gwkludge(); 341 ifinit(); 342 343 /* Ask for routes */ 344 rip_query(); 345 rdisc_sol(); 346 347 /* Now turn off stdio if not tracing */ 348 if (new_tracelevel == 0) 349 trace_close(background); 350 351 /* Loop forever, listening and broadcasting. 352 */ 353 for (;;) { 354 prev_clk = clk; 355 gettimeofday(&clk, 0); 356 timevalsub(&t2, &clk, &prev_clk); 357 if (t2.tv_sec < 0 358 || t2.tv_sec > wtime.tv_sec + 5) { 359 /* Deal with time changes before other housekeeping to 360 * keep everything straight. 361 */ 362 dt = t2.tv_sec; 363 if (dt > 0) 364 dt -= wtime.tv_sec; 365 trace_act("time changed by %d sec", (int)dt); 366 epoch.tv_sec += dt; 367 } 368 timevalsub(&now, &clk, &epoch); 369 now_stale = now.tv_sec - STALE_TIME; 370 now_expire = now.tv_sec - EXPIRE_TIME; 371 now_garbage = now.tv_sec - GARBAGE_TIME; 372 373 /* deal with signals that should affect tracing */ 374 set_tracelevel(); 375 376 if (stopint != 0) { 377 rip_bcast(0); 378 rdisc_adv(); 379 trace_off("exiting with signal %d", stopint); 380 exit(stopint | 128); 381 } 382 383 /* look for new or dead interfaces */ 384 timevalsub(&wtime, &ifinit_timer, &now); 385 if (wtime.tv_sec <= 0) { 386 wtime.tv_sec = 0; 387 ifinit(); 388 rip_query(); 389 continue; 390 } 391 392 /* Check the kernel table occassionally for mysteriously 393 * evaporated routes 394 */ 395 timevalsub(&t2, &flush_kern_timer, &now); 396 if (t2.tv_sec <= 0) { 397 flush_kern(); 398 flush_kern_timer.tv_sec = (now.tv_sec 399 + CHECK_QUIET_INTERVAL); 400 continue; 401 } 402 if (timercmp(&t2, &wtime, <)) 403 wtime = t2; 404 405 /* If it is time, then broadcast our routes. 406 */ 407 if (supplier || advertise_mhome) { 408 timevalsub(&t2, &next_bcast, &now); 409 if (t2.tv_sec <= 0) { 410 /* Synchronize the aging and broadcast 411 * timers to minimize awakenings 412 */ 413 age(0); 414 415 rip_bcast(0); 416 417 /* It is desirable to send routing updates 418 * regularly. So schedule the next update 419 * 30 seconds after the previous one was 420 * scheduled, instead of 30 seconds after 421 * the previous update was finished. 422 * Even if we just started after discovering 423 * a 2nd interface or were otherwise delayed, 424 * pick a 30-second aniversary of the 425 * original broadcast time. 426 */ 427 n = 1 + (0-t2.tv_sec)/SUPPLY_INTERVAL; 428 next_bcast.tv_sec += n*SUPPLY_INTERVAL; 429 430 continue; 431 } 432 433 if (timercmp(&t2, &wtime, <)) 434 wtime = t2; 435 } 436 437 /* If we need a flash update, either do it now or 438 * set the delay to end when it is time. 439 * 440 * If we are within MIN_WAITTIME seconds of a full update, 441 * do not bother. 442 */ 443 if (need_flash 444 && supplier 445 && no_flash.tv_sec+MIN_WAITTIME < next_bcast.tv_sec) { 446 /* accurate to the millisecond */ 447 if (!timercmp(&no_flash, &now, >)) 448 rip_bcast(1); 449 timevalsub(&t2, &no_flash, &now); 450 if (timercmp(&t2, &wtime, <)) 451 wtime = t2; 452 } 453 454 /* trigger the main aging timer. 455 */ 456 timevalsub(&t2, &age_timer, &now); 457 if (t2.tv_sec <= 0) { 458 age(0); 459 continue; 460 } 461 if (timercmp(&t2, &wtime, <)) 462 wtime = t2; 463 464 /* update the kernel routing table 465 */ 466 timevalsub(&t2, &need_kern, &now); 467 if (t2.tv_sec <= 0) { 468 age(0); 469 continue; 470 } 471 if (timercmp(&t2, &wtime, <)) 472 wtime = t2; 473 474 /* take care of router discovery, 475 * but do it in the correct the millisecond 476 */ 477 if (!timercmp(&rdisc_timer, &now, >)) { 478 rdisc_age(0); 479 continue; 480 } 481 timevalsub(&t2, &rdisc_timer, &now); 482 if (timercmp(&t2, &wtime, <)) 483 wtime = t2; 484 485 486 /* wait for input or a timer to expire. 487 */ 488 trace_flush(); 489 ibits = fdbits; 490 n = select(sock_max, &ibits, 0, 0, &wtime); 491 if (n <= 0) { 492 if (n < 0 && errno != EINTR && errno != EAGAIN) 493 BADERR(1,"select"); 494 continue; 495 } 496 497 if (FD_ISSET(rt_sock, &ibits)) { 498 read_rt(); 499 n--; 500 } 501 if (rdisc_sock >= 0 && FD_ISSET(rdisc_sock, &ibits)) { 502 read_d(); 503 n--; 504 } 505 if (rip_sock >= 0 && FD_ISSET(rip_sock, &ibits)) { 506 read_rip(rip_sock, 0); 507 n--; 508 } 509 510 for (ifp = ifnet; n > 0 && 0 != ifp; ifp = ifp->int_next) { 511 if (ifp->int_rip_sock >= 0 512 && FD_ISSET(ifp->int_rip_sock, &ibits)) { 513 read_rip(ifp->int_rip_sock, ifp); 514 n--; 515 } 516 } 517 } 518 } 519 520 521 /* ARGSUSED */ 522 void 523 sigalrm(int s UNUSED) 524 { 525 /* Historically, SIGALRM would cause the daemon to check for 526 * new and broken interfaces. 527 */ 528 ifinit_timer.tv_sec = now.tv_sec; 529 trace_act("SIGALRM"); 530 } 531 532 533 /* watch for fatal signals */ 534 void 535 sigterm(int sig) 536 { 537 stopint = sig; 538 (void)signal(sig, SIG_DFL); /* catch it only once */ 539 } 540 541 542 void 543 fix_select(void) 544 { 545 struct interface *ifp; 546 547 548 FD_ZERO(&fdbits); 549 sock_max = 0; 550 551 FD_SET(rt_sock, &fdbits); 552 if (sock_max <= rt_sock) 553 sock_max = rt_sock+1; 554 if (rip_sock >= 0) { 555 FD_SET(rip_sock, &fdbits); 556 if (sock_max <= rip_sock) 557 sock_max = rip_sock+1; 558 } 559 for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) { 560 if (ifp->int_rip_sock >= 0) { 561 FD_SET(ifp->int_rip_sock, &fdbits); 562 if (sock_max <= ifp->int_rip_sock) 563 sock_max = ifp->int_rip_sock+1; 564 } 565 } 566 if (rdisc_sock >= 0) { 567 FD_SET(rdisc_sock, &fdbits); 568 if (sock_max <= rdisc_sock) 569 sock_max = rdisc_sock+1; 570 } 571 } 572 573 574 void 575 fix_sock(int sock, 576 const char *name) 577 { 578 int on; 579 #define MIN_SOCKBUF (4*1024) 580 static int rbuf; 581 582 if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1) 583 logbad(1, "fcntl(%s) O_NONBLOCK: %s", 584 name, strerror(errno)); 585 on = 1; 586 if (setsockopt(sock, SOL_SOCKET,SO_BROADCAST, &on,sizeof(on)) < 0) 587 msglog("setsockopt(%s,SO_BROADCAST): %s", 588 name, strerror(errno)); 589 #ifdef USE_PASSIFNAME 590 on = 1; 591 if (setsockopt(sock, SOL_SOCKET, SO_PASSIFNAME, &on,sizeof(on)) < 0) 592 msglog("setsockopt(%s,SO_PASSIFNAME): %s", 593 name, strerror(errno)); 594 #endif 595 596 if (rbuf >= MIN_SOCKBUF) { 597 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, 598 &rbuf, sizeof(rbuf)) < 0) 599 msglog("setsockopt(%s,SO_RCVBUF=%d): %s", 600 name, rbuf, strerror(errno)); 601 } else { 602 for (rbuf = 60*1024; ; rbuf -= 4096) { 603 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, 604 &rbuf, sizeof(rbuf)) == 0) { 605 trace_act("RCVBUF=%d", rbuf); 606 break; 607 } 608 if (rbuf < MIN_SOCKBUF) { 609 msglog("setsockopt(%s,SO_RCVBUF = %d): %s", 610 name, rbuf, strerror(errno)); 611 break; 612 } 613 } 614 } 615 } 616 617 618 /* get a rip socket 619 */ 620 static int /* <0 or file descriptor */ 621 get_rip_sock(naddr addr, 622 int serious) /* 1=failure to bind is serious */ 623 { 624 struct sockaddr_in sin; 625 unsigned char ttl; 626 int s; 627 628 629 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) 630 BADERR(1,"rip_sock = socket()"); 631 632 memset(&sin, 0, sizeof(sin)); 633 #ifdef _HAVE_SIN_LEN 634 sin.sin_len = sizeof(sin); 635 #endif 636 sin.sin_family = AF_INET; 637 sin.sin_port = htons(RIP_PORT); 638 sin.sin_addr.s_addr = addr; 639 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 640 if (serious) 641 BADERR(errno != EADDRINUSE, "bind(rip_sock)"); 642 return -1; 643 } 644 fix_sock(s,"rip_sock"); 645 646 ttl = 1; 647 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, 648 &ttl, sizeof(ttl)) < 0) 649 DBGERR(1,"rip_sock setsockopt(IP_MULTICAST_TTL)"); 650 651 return s; 652 } 653 654 655 /* turn off main RIP socket */ 656 void 657 rip_off(void) 658 { 659 struct interface *ifp; 660 naddr addr; 661 662 663 if (rip_sock >= 0 && !mhome) { 664 trace_act("turn off RIP"); 665 666 (void)close(rip_sock); 667 rip_sock = -1; 668 669 /* get non-broadcast sockets to listen to queries. 670 */ 671 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 672 if (ifp->int_state & IS_REMOTE) 673 continue; 674 if (ifp->int_rip_sock < 0) { 675 addr = ((ifp->int_if_flags & IFF_POINTOPOINT) 676 ? ifp->int_dstaddr 677 : ifp->int_addr); 678 ifp->int_rip_sock = get_rip_sock(addr, 0); 679 } 680 } 681 682 fix_select(); 683 684 age(0); 685 } 686 } 687 688 689 /* turn on RIP multicast input via an interface 690 */ 691 static void 692 rip_mcast_on(struct interface *ifp) 693 { 694 struct ip_mreq m; 695 696 if (!IS_RIP_IN_OFF(ifp->int_state) 697 && (ifp->int_if_flags & IFF_MULTICAST) 698 #ifdef MCAST_PPP_BUG 699 && !(ifp->int_if_flags & IFF_POINTOPOINT) 700 #endif 701 && !(ifp->int_state & IS_ALIAS)) { 702 m.imr_multiaddr.s_addr = htonl(INADDR_RIP_GROUP); 703 m.imr_interface.s_addr = ((ifp->int_if_flags & IFF_POINTOPOINT) 704 ? ifp->int_dstaddr 705 : ifp->int_addr); 706 if (setsockopt(rip_sock,IPPROTO_IP, IP_ADD_MEMBERSHIP, 707 &m, sizeof(m)) < 0) 708 LOGERR("setsockopt(IP_ADD_MEMBERSHIP RIP)"); 709 } 710 } 711 712 713 /* Prepare socket used for RIP. 714 */ 715 void 716 rip_on(struct interface *ifp) 717 { 718 /* If the main RIP socket is already alive, only start receiving 719 * multicasts for this interface. 720 */ 721 if (rip_sock >= 0) { 722 if (ifp != 0) 723 rip_mcast_on(ifp); 724 return; 725 } 726 727 /* If the main RIP socket is off and it makes sense to turn it on, 728 * then turn it on for all of the interfaces. 729 * It makes sense if either router discovery is off, or if 730 * router discover is on and at most one interface is doing RIP. 731 */ 732 if (rip_interfaces > 0 && (!rdisc_ok || rip_interfaces > 1)) { 733 trace_act("turn on RIP"); 734 735 /* Close all of the query sockets so that we can open 736 * the main socket. SO_REUSEPORT is not a solution, 737 * since that would let two daemons bind to the broadcast 738 * socket. 739 */ 740 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 741 if (ifp->int_rip_sock >= 0) { 742 (void)close(ifp->int_rip_sock); 743 ifp->int_rip_sock = -1; 744 } 745 } 746 747 rip_sock = get_rip_sock(INADDR_ANY, 1); 748 rip_sock_mcast = 0; 749 750 /* Do not advertise anything until we have heard something 751 */ 752 if (next_bcast.tv_sec < now.tv_sec+MIN_WAITTIME) 753 next_bcast.tv_sec = now.tv_sec+MIN_WAITTIME; 754 755 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 756 ifp->int_query_time = NEVER; 757 rip_mcast_on(ifp); 758 } 759 ifinit_timer.tv_sec = now.tv_sec; 760 761 } else if (ifp != 0 762 && !(ifp->int_state & IS_REMOTE) 763 && ifp->int_rip_sock < 0) { 764 /* RIP is off, so ensure there are sockets on which 765 * to listen for queries. 766 */ 767 ifp->int_rip_sock = get_rip_sock(ifp->int_addr, 0); 768 } 769 770 fix_select(); 771 } 772 773 774 /* die if malloc(3) fails 775 */ 776 void * 777 rtmalloc(size_t size, 778 const char *msg) 779 { 780 void *p = malloc(size); 781 if (p == 0) 782 logbad(1,"malloc(%ld) failed in %s", (long)size, msg); 783 return p; 784 } 785 786 787 /* get a random instant in an interval 788 */ 789 void 790 intvl_random(struct timeval *tp, /* put value here */ 791 u_long lo, /* value is after this second */ 792 u_long hi) /* and before this */ 793 { 794 tp->tv_sec = (time_t)(hi == lo 795 ? lo 796 : (lo + random() % ((hi - lo)))); 797 tp->tv_usec = random() % 1000000; 798 } 799 800 801 void 802 timevaladd(struct timeval *t1, 803 struct timeval *t2) 804 { 805 806 t1->tv_sec += t2->tv_sec; 807 if ((t1->tv_usec += t2->tv_usec) >= 1000000) { 808 t1->tv_sec++; 809 t1->tv_usec -= 1000000; 810 } 811 } 812 813 814 /* t1 = t2 - t3 815 */ 816 static void 817 timevalsub(struct timeval *t1, 818 struct timeval *t2, 819 struct timeval *t3) 820 { 821 t1->tv_sec = t2->tv_sec - t3->tv_sec; 822 if ((t1->tv_usec = t2->tv_usec - t3->tv_usec) < 0) { 823 t1->tv_sec--; 824 t1->tv_usec += 1000000; 825 } 826 } 827 828 829 /* put a message into the system log 830 */ 831 void 832 msglog(const char *p, ...) 833 { 834 va_list args; 835 836 trace_flush(); 837 838 va_start(args, p); 839 vsyslog(LOG_ERR, p, args); 840 841 if (ftrace != 0) { 842 if (ftrace == stdout) 843 (void)fputs("routed: ", ftrace); 844 (void)vfprintf(ftrace, p, args); 845 (void)fputc('\n', ftrace); 846 } 847 } 848 849 850 /* Put a message about a bad system into the system log if 851 * we have not complained about it recently. 852 * 853 * It is desirable to complain about all bad systems, but not too often. 854 * In the worst case, it is not practical to keep track of all bad systems. 855 * For example, there can be many systems with the wrong password. 856 */ 857 void 858 msglim(struct msg_limit *lim, naddr addr, const char *p, ...) 859 { 860 va_list args; 861 int i; 862 struct msg_sub *ms1, *ms; 863 const char *p1; 864 865 va_start(args, p); 866 867 /* look for the oldest slot in the table 868 * or the slot for the bad router. 869 */ 870 ms = ms1 = lim->subs; 871 for (i = MSG_SUBJECT_N; ; i--, ms1++) { 872 if (i == 0) { 873 /* Reuse a slot at most once every 10 minutes. 874 */ 875 if (lim->reuse > now.tv_sec) { 876 ms = 0; 877 } else { 878 ms = ms1; 879 lim->reuse = now.tv_sec + 10*60; 880 } 881 break; 882 } 883 if (ms->addr == addr) { 884 /* Repeat a complaint about a given system at 885 * most once an hour. 886 */ 887 if (ms->until > now.tv_sec) 888 ms = 0; 889 break; 890 } 891 if (ms->until < ms1->until) 892 ms = ms1; 893 } 894 if (ms != 0) { 895 ms->addr = addr; 896 ms->until = now.tv_sec + 60*60; /* 60 minutes */ 897 898 trace_flush(); 899 for (p1 = p; *p1 == ' '; p1++) 900 continue; 901 vsyslog(LOG_ERR, p1, args); 902 } 903 904 /* always display the message if tracing */ 905 if (ftrace != 0) { 906 (void)vfprintf(ftrace, p, args); 907 (void)fputc('\n', ftrace); 908 } 909 } 910 911 912 void 913 logbad(int dump, const char *p, ...) 914 { 915 va_list args; 916 917 trace_flush(); 918 919 va_start(args, p); 920 vsyslog(LOG_ERR, p, args); 921 922 (void)fputs("routed: ", stderr); 923 (void)vfprintf(stderr, p, args); 924 (void)fputs("; giving up\n",stderr); 925 (void)fflush(stderr); 926 927 if (dump) 928 abort(); 929 exit(1); 930 } 931