1 /* $NetBSD: main.c,v 1.14 1996/08/10 01:29:23 thorpej 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 acknowledgement: 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 char copyright[] = 37 "@(#) Copyright (c) 1983, 1988, 1993\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39 #if !defined(lint) && !defined(sgi) 40 #if 0 41 static char sccsid[] = "@(#)main.c 8.1 (Berkeley) 6/5/93"; 42 #else 43 static char rcsid[] = "$NetBSD: main.c,v 1.14 1996/08/10 01:29:23 thorpej Exp $"; 44 #endif 45 #endif /* not lint */ 46 47 #include "defs.h" 48 #include "pathnames.h" 49 #ifdef sgi 50 #include "math.h" 51 #endif 52 #include <signal.h> 53 #include <fcntl.h> 54 #include <sys/file.h> 55 56 pid_t mypid; 57 58 naddr myaddr; /* system address */ 59 char myname[MAXHOSTNAMELEN+1]; 60 61 int supplier; /* supply or broadcast updates */ 62 int supplier_set; 63 int ipforwarding = 1; /* kernel forwarding on */ 64 65 int default_gateway; /* 1=advertise default */ 66 int background = 1; 67 int ridhosts; /* 1=reduce host routes */ 68 int mhome; /* 1=want multi-homed host route */ 69 int advertise_mhome; /* 1=must continue adverising it */ 70 int auth_ok = 1; /* 1=ignore auth if we do not care */ 71 72 struct timeval epoch; /* when started */ 73 struct timeval clk, prev_clk; 74 struct timeval now; /* current idea of time */ 75 time_t now_stale; 76 time_t now_garbage; 77 78 struct timeval next_bcast; /* next general broadcast */ 79 struct timeval no_flash = {EPOCH+SUPPLY_INTERVAL}; /* inhibit flash update */ 80 81 fd_set fdbits; 82 int sock_max; 83 int rip_sock = -1; /* RIP socket */ 84 struct interface *rip_sock_mcast; /* current multicast interface */ 85 int rt_sock; /* routing socket */ 86 int rt_sock_seqno; 87 88 89 static int get_rip_sock(naddr, int); 90 static void timevalsub(struct timeval *, struct timeval *, struct timeval *); 91 92 int 93 main(int argc, 94 char *argv[]) 95 { 96 int n, mib[4], off; 97 size_t len; 98 char *p, *q; 99 struct timeval wtime, t2; 100 time_t dt; 101 fd_set ibits; 102 naddr p_addr, p_mask; 103 struct interface *ifp; 104 struct parm parm; 105 char *tracename = 0; 106 107 108 openlog("routed", LOG_PID | LOG_ODELAY, LOG_DAEMON); 109 ftrace = stdout; 110 111 gettimeofday(&clk, 0); 112 prev_clk = clk; 113 epoch = clk; 114 epoch.tv_sec -= EPOCH; 115 now.tv_sec = EPOCH; 116 now_stale = EPOCH - STALE_TIME; 117 now_garbage = EPOCH - GARBAGE_TIME; 118 wtime.tv_sec = 0; 119 120 (void)gethostname(myname, sizeof(myname)-1); 121 (void)gethost(myname, &myaddr); 122 123 while ((n = getopt(argc, argv, "sqdghmpAtT:F:P:")) != EOF) { 124 switch (n) { 125 case 's': 126 supplier = 1; 127 supplier_set = 1; 128 break; 129 130 case 'q': 131 supplier = 0; 132 supplier_set = 1; 133 break; 134 135 case 'd': 136 background = 0; 137 break; 138 139 case 'g': 140 bzero(&parm, sizeof(parm)); 141 parm.parm_d_metric = 1; 142 p = check_parms(&parm); 143 if (p != 0) 144 msglog("bad -g: %s", p); 145 else 146 default_gateway = 1; 147 break; 148 149 case 'h': /* suppress extra host routes */ 150 ridhosts = 1; 151 break; 152 153 case 'm': /* advertise host route */ 154 mhome = 1; /* on multi-homed hosts */ 155 break; 156 157 case 'A': 158 /* Ignore authentication if we do not care. 159 * Crazy as it is, that is what RFC 1723 requires. 160 */ 161 auth_ok = 0; 162 break; 163 164 case 't': 165 new_tracelevel++; 166 break; 167 168 case 'T': 169 tracename = optarg; 170 break; 171 172 case 'F': /* minimal routes for SLIP */ 173 n = HOPCNT_INFINITY-2; 174 p = strchr(optarg,','); 175 if (p && *p != '\0') { 176 n = (int)strtoul(p+1, &q, 0); 177 if (*q == '\0' 178 && n <= HOPCNT_INFINITY-1 179 && n >= 1) 180 *p = '\0'; 181 } 182 if (!getnet(optarg, &p_addr, &p_mask)) { 183 msglog("bad network; \"-F %s\"", 184 optarg); 185 break; 186 } 187 bzero(&parm, sizeof(parm)); 188 parm.parm_addr_h = ntohl(p_addr); 189 parm.parm_mask = p_mask; 190 parm.parm_d_metric = n; 191 p = check_parms(&parm); 192 if (p != 0) 193 msglog("bad -F: %s", p); 194 break; 195 196 case 'P': 197 /* handle arbirary, (usually) per-interface 198 * parameters. 199 */ 200 p = parse_parms(optarg); 201 if (p != 0) 202 msglog("bad \"%s\" in \"%s\"", 203 p, optarg); 204 break; 205 206 default: 207 goto usage; 208 } 209 } 210 argc -= optind; 211 argv += optind; 212 213 if (tracename == 0 && argc >= 1) { 214 tracename = *argv++; 215 argc--; 216 } 217 if (argc != 0) { 218 usage: 219 logbad(0, "usage: routed [-sqdghmpAt] [-T /tracefile]" 220 " [-F net[,metric]] [-P parms]"); 221 } 222 if (geteuid() != 0) 223 logbad(0, "requires UID 0"); 224 225 mib[0] = CTL_NET; 226 mib[1] = PF_INET; 227 mib[2] = IPPROTO_IP; 228 mib[3] = IPCTL_FORWARDING; 229 len = sizeof(ipforwarding); 230 if (sysctl(mib, 4, &ipforwarding, &len, 0, 0) < 0) 231 LOGERR("sysctl(IPCTL_FORWARDING)"); 232 233 if (!ipforwarding) { 234 if (supplier) 235 msglog("-s incompatible with ipforwarding=0"); 236 if (default_gateway) { 237 msglog("-g incompatible with ipforwarding=0"); 238 default_gateway = 0; 239 } 240 supplier = 0; 241 supplier_set = 1; 242 } 243 if (default_gateway) { 244 if (supplier_set && !supplier) { 245 msglog("-g and -q incompatible"); 246 } else { 247 supplier = 1; 248 supplier_set = 1; 249 } 250 } 251 252 253 /* get into the background */ 254 if (background) { 255 #ifdef sgi 256 if (0 > _daemonize(_DF_NOCHDIR, 257 new_tracelevel == 0 ? -1 : STDOUT_FILENO, 258 new_tracelevel == 0 ? -1 : STDERR_FILENO, 259 -1)) 260 BADERR(0, "_daemonize()"); 261 #else 262 if (daemon(1, 1) < 0) 263 BADERR(0,"daemon()"); 264 #endif 265 } 266 267 mypid = getpid(); 268 srandom((int)(clk.tv_sec ^ clk.tv_usec ^ mypid)); 269 270 /* prepare socket connected to the kernel. 271 */ 272 rt_sock = socket(AF_ROUTE, SOCK_RAW, 0); 273 if (rt_sock < 0) 274 BADERR(1,"rt_sock = socket()"); 275 if (fcntl(rt_sock, F_SETFL, O_NONBLOCK) == -1) 276 logbad(1, "fcntl(rt_sock) O_NONBLOCK: %s", strerror(errno)); 277 off = 0; 278 if (setsockopt(rt_sock, SOL_SOCKET,SO_USELOOPBACK, 279 &off,sizeof(off)) < 0) 280 LOGERR("setsockopt(SO_USELOOPBACK,0)"); 281 282 /* prepare Router Discovery socket. 283 */ 284 rdisc_sock = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); 285 if (rdisc_sock < 0) 286 BADERR(1,"rdisc_sock = socket()"); 287 fix_sock(rdisc_sock,"rdisc_sock"); 288 289 fix_select(); 290 291 292 if (background && new_tracelevel == 0) 293 ftrace = 0; 294 if (tracename != 0) { 295 trace_on(tracename, 1); 296 if (new_tracelevel == 0) /* use stdout if file is bad */ 297 new_tracelevel = 1; 298 } 299 set_tracelevel(); 300 301 /* initialize radix tree */ 302 rtinit(); 303 304 /* Pick a random part of the second for our output to minimize 305 * collisions. 306 * 307 * Start broadcasting after hearing from other routers, and 308 * at a random time so a bunch of systems do not get synchronized 309 * after a power failure. 310 */ 311 intvl_random(&next_bcast, EPOCH+MIN_WAITTIME, EPOCH+SUPPLY_INTERVAL); 312 age_timer.tv_usec = next_bcast.tv_usec; 313 age_timer.tv_sec = EPOCH+MIN_WAITTIME; 314 rdisc_timer = next_bcast; 315 ifinit_timer.tv_usec = next_bcast.tv_usec; 316 317 signal(SIGALRM, sigalrm); 318 signal(SIGHUP, sigterm); 319 signal(SIGTERM, sigterm); 320 signal(SIGINT, sigterm); 321 signal(SIGUSR1, sigtrace_on); 322 signal(SIGUSR2, sigtrace_off); 323 324 /* Collect an initial view of the world by checking the interface 325 * configuration and the kludge file. 326 */ 327 gwkludge(); 328 ifinit(); 329 flush_kern(); 330 331 /* Ask for routes */ 332 rip_query(); 333 if (!supplier) 334 rdisc_sol(); 335 336 /* Loop forever, listening and broadcasting. 337 */ 338 for (;;) { 339 prev_clk = clk; 340 gettimeofday(&clk, 0); 341 timevalsub(&t2, &clk, &prev_clk); 342 if (t2.tv_sec < 0 343 || t2.tv_sec > wtime.tv_sec + 5) { 344 /* Deal with time changes before other housekeeping to 345 * keep everything straight. 346 */ 347 dt = t2.tv_sec; 348 if (dt > 0) 349 dt -= wtime.tv_sec; 350 trace_act("time changed by %d sec\n", dt); 351 epoch.tv_sec += dt; 352 } 353 timevalsub(&now, &clk, &epoch); 354 now_stale = now.tv_sec - STALE_TIME; 355 now_garbage = now.tv_sec - GARBAGE_TIME; 356 357 /* deal with interrupts that should affect tracing */ 358 set_tracelevel(); 359 360 if (stopint != 0) { 361 if (supplier) { 362 rip_bcast(0); 363 rdisc_adv(); 364 } 365 trace_off("exiting with signal %d\n", stopint); 366 exit(stopint | 128); 367 } 368 369 /* look for new or dead interfaces */ 370 timevalsub(&wtime, &ifinit_timer, &now); 371 if (wtime.tv_sec <= 0) { 372 wtime.tv_sec = 0; 373 ifinit(); 374 rip_query(); 375 continue; 376 } 377 378 /* If it is time, then broadcast our routes. 379 */ 380 if (supplier || advertise_mhome) { 381 timevalsub(&t2, &next_bcast, &now); 382 if (t2.tv_sec <= 0) { 383 /* Synchronize the aging and broadcast 384 * timers to minimize awakenings 385 */ 386 age(0); 387 388 rip_bcast(0); 389 390 /* It is desirable to send routing updates 391 * regularly. So schedule the next update 392 * 30 seconds after the previous one was 393 * secheduled, instead of 30 seconds after 394 * the previous update was finished. 395 * Even if we just started after discovering 396 * a 2nd interface or were otherwise delayed, 397 * pick a 30-second aniversary of the 398 * original broadcast time. 399 */ 400 n = 1 + (0-t2.tv_sec)/SUPPLY_INTERVAL; 401 next_bcast.tv_sec += n*SUPPLY_INTERVAL; 402 403 continue; 404 } 405 406 if (timercmp(&t2, &wtime, <)) 407 wtime = t2; 408 } 409 410 /* If we need a flash update, either do it now or 411 * set the delay to end when it is time. 412 * 413 * If we are within MIN_WAITTIME seconds of a full update, 414 * do not bother. 415 */ 416 if (need_flash 417 && supplier 418 && no_flash.tv_sec+MIN_WAITTIME < next_bcast.tv_sec) { 419 /* accurate to the millisecond */ 420 if (!timercmp(&no_flash, &now, >)) 421 rip_bcast(1); 422 timevalsub(&t2, &no_flash, &now); 423 if (timercmp(&t2, &wtime, <)) 424 wtime = t2; 425 } 426 427 /* trigger the main aging timer. 428 */ 429 timevalsub(&t2, &age_timer, &now); 430 if (t2.tv_sec <= 0) { 431 age(0); 432 continue; 433 } 434 if (timercmp(&t2, &wtime, <)) 435 wtime = t2; 436 437 /* update the kernel routing table 438 */ 439 timevalsub(&t2, &need_kern, &now); 440 if (t2.tv_sec <= 0) { 441 age(0); 442 continue; 443 } 444 if (timercmp(&t2, &wtime, <)) 445 wtime = t2; 446 447 /* take care of router discovery, 448 * but do it to the millisecond 449 */ 450 if (!timercmp(&rdisc_timer, &now, >)) { 451 rdisc_age(0); 452 continue; 453 } 454 timevalsub(&t2, &rdisc_timer, &now); 455 if (timercmp(&t2, &wtime, <)) 456 wtime = t2; 457 458 459 /* wait for input or a timer to expire. 460 */ 461 trace_flush(); 462 ibits = fdbits; 463 n = select(sock_max, &ibits, 0, 0, &wtime); 464 if (n <= 0) { 465 if (n < 0 && errno != EINTR && errno != EAGAIN) 466 BADERR(1,"select"); 467 continue; 468 } 469 470 if (FD_ISSET(rt_sock, &ibits)) { 471 read_rt(); 472 n--; 473 } 474 if (rdisc_sock >= 0 && FD_ISSET(rdisc_sock, &ibits)) { 475 read_d(); 476 n--; 477 } 478 if (rip_sock >= 0 && FD_ISSET(rip_sock, &ibits)) { 479 read_rip(rip_sock, 0); 480 n--; 481 } 482 483 for (ifp = ifnet; n > 0 && 0 != ifp; ifp = ifp->int_next) { 484 if (ifp->int_rip_sock >= 0 485 && FD_ISSET(ifp->int_rip_sock, &ibits)) { 486 read_rip(ifp->int_rip_sock, ifp); 487 n--; 488 } 489 } 490 } 491 } 492 493 494 /* ARGSUSED */ 495 void 496 sigalrm(int sig) 497 { 498 /* Historically, SIGALRM would cause the daemon to check for 499 * new and broken interfaces. 500 */ 501 ifinit_timer.tv_sec = now.tv_sec; 502 trace_act("SIGALRM\n"); 503 } 504 505 506 /* watch for fatal signals */ 507 void 508 sigterm(int sig) 509 { 510 stopint = sig; 511 (void)signal(sig, SIG_DFL); /* catch it only once */ 512 } 513 514 515 void 516 fix_select(void) 517 { 518 struct interface *ifp; 519 520 521 FD_ZERO(&fdbits); 522 sock_max = 0; 523 524 FD_SET(rt_sock, &fdbits); 525 if (sock_max <= rt_sock) 526 sock_max = rt_sock+1; 527 if (rip_sock >= 0) { 528 FD_SET(rip_sock, &fdbits); 529 if (sock_max <= rip_sock) 530 sock_max = rip_sock+1; 531 } 532 for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) { 533 if (ifp->int_rip_sock >= 0) { 534 FD_SET(ifp->int_rip_sock, &fdbits); 535 if (sock_max <= ifp->int_rip_sock) 536 sock_max = ifp->int_rip_sock+1; 537 } 538 } 539 if (rdisc_sock >= 0) { 540 FD_SET(rdisc_sock, &fdbits); 541 if (sock_max <= rdisc_sock) 542 sock_max = rdisc_sock+1; 543 } 544 } 545 546 547 void 548 fix_sock(int sock, 549 char *name) 550 { 551 int on; 552 #define MIN_SOCKBUF (4*1024) 553 static int rbuf; 554 555 if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1) 556 logbad(1, "fcntl(%s) O_NONBLOCK: %s", 557 name, strerror(errno)); 558 on = 1; 559 if (setsockopt(sock, SOL_SOCKET,SO_BROADCAST, 560 &on,sizeof(on)) < 0) 561 msglog("setsockopt(%s,SO_BROADCAST): %s", 562 name, strerror(errno)); 563 if (rbuf >= MIN_SOCKBUF) { 564 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, 565 &rbuf, sizeof(rbuf)) < 0) 566 msglog("setsockopt(%s,SO_RCVBUF=%d): %s", 567 name, rbuf, strerror(errno)); 568 } else { 569 for (rbuf = 60*1024; ; rbuf -= 4096) { 570 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, 571 &rbuf, sizeof(rbuf)) == 0) { 572 trace_act("RCVBUF=%d\n", rbuf); 573 break; 574 } 575 if (rbuf < MIN_SOCKBUF) { 576 msglog("setsockopt(%s,SO_RCVBUF = %d): %s", 577 name, rbuf, strerror(errno)); 578 break; 579 } 580 } 581 } 582 } 583 584 585 /* get a rip socket 586 */ 587 static int /* <0 or file descriptor */ 588 get_rip_sock(naddr addr, 589 int serious) /* 1=failure to bind is serious */ 590 { 591 struct sockaddr_in sin; 592 unsigned char ttl; 593 int s; 594 595 596 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) 597 BADERR(1,"rip_sock = socket()"); 598 599 bzero(&sin,sizeof(sin)); 600 #ifdef _HAVE_SIN_LEN 601 sin.sin_len = sizeof(sin); 602 #endif 603 sin.sin_family = AF_INET; 604 sin.sin_port = htons(RIP_PORT); 605 sin.sin_addr.s_addr = addr; 606 if (bind(s, (struct sockaddr *)&sin,sizeof(sin)) < 0) { 607 if (serious) 608 BADERR(errno != EADDRINUSE, "bind(rip_sock)"); 609 return -1; 610 } 611 fix_sock(s,"rip_sock"); 612 613 ttl = 1; 614 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, 615 &ttl, sizeof(ttl)) < 0) 616 DBGERR(1,"rip_sock setsockopt(IP_MULTICAST_TTL)"); 617 618 return s; 619 } 620 621 622 /* turn off main RIP socket */ 623 void 624 rip_off(void) 625 { 626 struct interface *ifp; 627 register naddr addr; 628 629 630 if (rip_sock >= 0 && !mhome) { 631 trace_act("turn off RIP\n"); 632 633 (void)close(rip_sock); 634 rip_sock = -1; 635 636 /* get non-broadcast sockets to listen to queries. 637 */ 638 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 639 if (ifp->int_rip_sock < 0 640 && !(ifp->int_state & IS_ALIAS)) { 641 addr = ((ifp->int_if_flags & IFF_POINTOPOINT) 642 ? ifp->int_dstaddr 643 : ifp->int_addr); 644 ifp->int_rip_sock = get_rip_sock(addr, 0); 645 } 646 } 647 648 fix_select(); 649 650 age(0); 651 } 652 } 653 654 655 /* turn on RIP multicast input via an interface 656 */ 657 static void 658 rip_mcast_on(struct interface *ifp) 659 { 660 struct ip_mreq m; 661 662 if (!IS_RIP_IN_OFF(ifp->int_state) 663 && (ifp->int_if_flags & IFF_MULTICAST) 664 #ifdef MCAST_PPP_BUG 665 && !(ifp->int_if_flags & IFF_POINTOPOINT) 666 #endif 667 && !(ifp->int_state & IS_ALIAS)) { 668 m.imr_multiaddr.s_addr = htonl(INADDR_RIP_GROUP); 669 m.imr_interface.s_addr = ((ifp->int_if_flags & IFF_POINTOPOINT) 670 ? ifp->int_dstaddr 671 : ifp->int_addr); 672 if (setsockopt(rip_sock,IPPROTO_IP, IP_ADD_MEMBERSHIP, 673 &m, sizeof(m)) < 0) 674 LOGERR("setsockopt(IP_ADD_MEMBERSHIP RIP)"); 675 } 676 } 677 678 679 /* Prepare socket used for RIP. 680 */ 681 void 682 rip_on(struct interface *ifp) 683 { 684 /* If the main RIP socket is already alive, only start receiving 685 * multicasts for this interface. 686 */ 687 if (rip_sock >= 0) { 688 if (ifp != 0) 689 rip_mcast_on(ifp); 690 return; 691 } 692 693 /* If the main RIP socket is off, and it makes sense to turn it on, 694 * turn it on for all of the interfaces. 695 */ 696 if (rip_interfaces > 0 && !rdisc_ok) { 697 trace_act("turn on RIP\n"); 698 699 /* Close all of the query sockets so that we can open 700 * the main socket. SO_REUSEPORT is not a solution, 701 * since that would let two daemons bind to the broadcast 702 * socket. 703 */ 704 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 705 if (ifp->int_rip_sock >= 0) { 706 (void)close(ifp->int_rip_sock); 707 ifp->int_rip_sock = -1; 708 } 709 } 710 711 rip_sock = get_rip_sock(INADDR_ANY, 1); 712 rip_sock_mcast = 0; 713 714 /* Do not advertise anything until we have heard something 715 */ 716 if (next_bcast.tv_sec < now.tv_sec+MIN_WAITTIME) 717 next_bcast.tv_sec = now.tv_sec+MIN_WAITTIME; 718 719 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 720 if (!IS_RIP_IN_OFF(ifp->int_state)) 721 ifp->int_state &= ~IS_RIP_QUERIED; 722 rip_mcast_on(ifp); 723 } 724 725 ifinit_timer.tv_sec = now.tv_sec; 726 727 fix_select(); 728 729 } else if (ifp != 0 730 && ifp->int_rip_sock < 0 731 && !(ifp->int_state & IS_ALIAS)) { 732 /* RIP is off, so ensure there are sockets on which 733 * to listen for queries. 734 */ 735 ifp->int_rip_sock = get_rip_sock(ifp->int_addr, 0); 736 737 fix_select(); 738 } 739 } 740 741 742 /* get a random instant in an interval 743 */ 744 void 745 intvl_random(struct timeval *tp, /* put value here */ 746 u_long lo, /* value is after this second */ 747 u_long hi) /* and before this */ 748 { 749 tp->tv_sec = (time_t)(hi == lo 750 ? lo 751 : (lo + random() % ((hi - lo)))); 752 tp->tv_usec = random() % 1000000; 753 } 754 755 756 void 757 timevaladd(struct timeval *t1, 758 struct timeval *t2) 759 { 760 761 t1->tv_sec += t2->tv_sec; 762 if ((t1->tv_usec += t2->tv_usec) > 1000000) { 763 t1->tv_sec++; 764 t1->tv_usec -= 1000000; 765 } 766 } 767 768 769 /* t1 = t2 - t3 770 */ 771 static void 772 timevalsub(struct timeval *t1, 773 struct timeval *t2, 774 struct timeval *t3) 775 { 776 t1->tv_sec = t2->tv_sec - t3->tv_sec; 777 if ((t1->tv_usec = t2->tv_usec - t3->tv_usec) < 0) { 778 t1->tv_sec--; 779 t1->tv_usec += 1000000; 780 } 781 } 782 783 784 void 785 msglog(char *p, ...) 786 { 787 va_list args; 788 789 trace_flush(); 790 791 va_start(args, p); 792 vsyslog(LOG_ERR, p, args); 793 794 if (ftrace != 0) { 795 if (ftrace == stdout) 796 (void)fputs("routed: ", ftrace); 797 (void)vfprintf(ftrace, p, args); 798 (void)fputc('\n', ftrace); 799 } 800 } 801 802 803 void 804 logbad(int dump, char *p, ...) 805 { 806 va_list args; 807 808 trace_flush(); 809 810 va_start(args, p); 811 vsyslog(LOG_ERR, p, args); 812 813 (void)fputs("routed: ", stderr); 814 (void)vfprintf(stderr, p, args); 815 (void)fputs("; giving up\n",stderr); 816 (void)fflush(stderr); 817 818 if (dump) 819 abort(); 820 exit(1); 821 } 822