1 /* $NetBSD: main.c,v 1.15 1996/09/24 16:24:15 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 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) && !defined(__NetBSD__) 40 static char sccsid[] = "@(#)main.c 8.1 (Berkeley) 6/5/93"; 41 #elif defined(__NetBSD__) 42 static char rcsid[] = "$NetBSD: main.c,v 1.15 1996/09/24 16:24:15 christos Exp $"; 43 #endif 44 45 #include "defs.h" 46 #include "pathnames.h" 47 #ifdef sgi 48 #include "math.h" 49 #endif 50 #include <signal.h> 51 #include <fcntl.h> 52 #include <sys/file.h> 53 54 pid_t mypid; 55 56 naddr myaddr; /* system address */ 57 char myname[MAXHOSTNAMELEN+1]; 58 59 int supplier; /* supply or broadcast updates */ 60 int supplier_set; 61 int ipforwarding = 1; /* kernel forwarding on */ 62 63 int default_gateway; /* 1=advertise default */ 64 int background = 1; 65 int ridhosts; /* 1=reduce host routes */ 66 int mhome; /* 1=want multi-homed host route */ 67 int advertise_mhome; /* 1=must continue adverising it */ 68 int auth_ok = 1; /* 1=ignore auth if we do not care */ 69 70 struct timeval epoch; /* when started */ 71 struct timeval clk, prev_clk; 72 struct timeval now; /* current idea of time */ 73 time_t now_stale; 74 time_t now_expire; 75 time_t now_garbage; 76 77 struct timeval next_bcast; /* next general broadcast */ 78 struct timeval no_flash = {EPOCH+SUPPLY_INTERVAL}; /* inhibit flash update */ 79 80 fd_set fdbits; 81 int sock_max; 82 int rip_sock = -1; /* RIP socket */ 83 struct interface *rip_sock_mcast; /* current multicast interface */ 84 int rt_sock; /* routing socket */ 85 int rt_sock_seqno; 86 87 88 static int get_rip_sock(naddr, int); 89 static void timevalsub(struct timeval *, struct timeval *, struct timeval *); 90 91 int 92 main(int argc, 93 char *argv[]) 94 { 95 int n, mib[4], off; 96 size_t len; 97 char *p, *q; 98 struct timeval wtime, t2; 99 time_t dt; 100 fd_set ibits; 101 naddr p_addr, p_mask; 102 struct interface *ifp; 103 struct parm parm; 104 char *tracename = 0; 105 106 107 openlog("routed", LOG_PID | LOG_ODELAY, LOG_DAEMON); 108 ftrace = stdout; 109 110 gettimeofday(&clk, 0); 111 prev_clk = clk; 112 epoch = clk; 113 epoch.tv_sec -= EPOCH; 114 now.tv_sec = EPOCH; 115 now_stale = EPOCH - STALE_TIME; 116 now_expire = EPOCH - EXPIRE_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 signal(SIGALRM, sigalrm); 254 if (!background) 255 signal(SIGHUP, sigterm); /* SIGHUP fatal during debugging */ 256 else 257 signal(SIGHUP, SIG_IGN); 258 signal(SIGTERM, sigterm); 259 signal(SIGINT, sigterm); 260 signal(SIGUSR1, sigtrace_on); 261 signal(SIGUSR2, sigtrace_off); 262 263 /* get into the background */ 264 if (background) { 265 #ifdef sgi 266 if (0 > _daemonize(_DF_NOCHDIR, 267 new_tracelevel == 0 ? -1 : STDOUT_FILENO, 268 new_tracelevel == 0 ? -1 : STDERR_FILENO, 269 -1)) 270 BADERR(0, "_daemonize()"); 271 #else 272 if (daemon(1, 1) < 0) 273 BADERR(0,"daemon()"); 274 #endif 275 } 276 277 mypid = getpid(); 278 srandom((int)(clk.tv_sec ^ clk.tv_usec ^ mypid)); 279 280 /* prepare socket connected to the kernel. 281 */ 282 rt_sock = socket(AF_ROUTE, SOCK_RAW, 0); 283 if (rt_sock < 0) 284 BADERR(1,"rt_sock = socket()"); 285 if (fcntl(rt_sock, F_SETFL, O_NONBLOCK) == -1) 286 logbad(1, "fcntl(rt_sock) O_NONBLOCK: %s", strerror(errno)); 287 off = 0; 288 if (setsockopt(rt_sock, SOL_SOCKET,SO_USELOOPBACK, 289 &off,sizeof(off)) < 0) 290 LOGERR("setsockopt(SO_USELOOPBACK,0)"); 291 292 fix_select(); 293 294 295 if (background && new_tracelevel == 0) 296 ftrace = 0; 297 if (tracename != 0) { 298 trace_on(tracename, 1); 299 if (new_tracelevel == 0) /* use stdout if file is bad */ 300 new_tracelevel = 1; 301 } 302 set_tracelevel(); 303 304 /* initialize radix tree */ 305 rtinit(); 306 307 /* Pick a random part of the second for our output to minimize 308 * collisions. 309 * 310 * Start broadcasting after hearing from other routers, and 311 * at a random time so a bunch of systems do not get synchronized 312 * after a power failure. 313 */ 314 intvl_random(&next_bcast, EPOCH+MIN_WAITTIME, EPOCH+SUPPLY_INTERVAL); 315 age_timer.tv_usec = next_bcast.tv_usec; 316 age_timer.tv_sec = EPOCH+MIN_WAITTIME; 317 rdisc_timer = next_bcast; 318 ifinit_timer.tv_usec = next_bcast.tv_usec; 319 320 /* Collect an initial view of the world by checking the interface 321 * configuration and the kludge file. 322 */ 323 gwkludge(); 324 ifinit(); 325 flush_kern(); 326 327 /* Ask for routes */ 328 rip_query(); 329 if (!supplier) 330 rdisc_sol(); 331 332 /* Loop forever, listening and broadcasting. 333 */ 334 for (;;) { 335 prev_clk = clk; 336 gettimeofday(&clk, 0); 337 timevalsub(&t2, &clk, &prev_clk); 338 if (t2.tv_sec < 0 339 || t2.tv_sec > wtime.tv_sec + 5) { 340 /* Deal with time changes before other housekeeping to 341 * keep everything straight. 342 */ 343 dt = t2.tv_sec; 344 if (dt > 0) 345 dt -= wtime.tv_sec; 346 trace_act("time changed by %d sec\n", dt); 347 epoch.tv_sec += dt; 348 } 349 timevalsub(&now, &clk, &epoch); 350 now_stale = now.tv_sec - STALE_TIME; 351 now_expire = now.tv_sec - EXPIRE_TIME; 352 now_garbage = now.tv_sec - GARBAGE_TIME; 353 354 /* deal with interrupts that should affect tracing */ 355 set_tracelevel(); 356 357 if (stopint != 0) { 358 if (supplier) { 359 rip_bcast(0); 360 rdisc_adv(); 361 } 362 trace_off("exiting with signal %d\n", stopint); 363 exit(stopint | 128); 364 } 365 366 /* look for new or dead interfaces */ 367 timevalsub(&wtime, &ifinit_timer, &now); 368 if (wtime.tv_sec <= 0) { 369 wtime.tv_sec = 0; 370 ifinit(); 371 rip_query(); 372 continue; 373 } 374 375 /* If it is time, then broadcast our routes. 376 */ 377 if (supplier || advertise_mhome) { 378 timevalsub(&t2, &next_bcast, &now); 379 if (t2.tv_sec <= 0) { 380 /* Synchronize the aging and broadcast 381 * timers to minimize awakenings 382 */ 383 age(0); 384 385 rip_bcast(0); 386 387 /* It is desirable to send routing updates 388 * regularly. So schedule the next update 389 * 30 seconds after the previous one was 390 * secheduled, instead of 30 seconds after 391 * the previous update was finished. 392 * Even if we just started after discovering 393 * a 2nd interface or were otherwise delayed, 394 * pick a 30-second aniversary of the 395 * original broadcast time. 396 */ 397 n = 1 + (0-t2.tv_sec)/SUPPLY_INTERVAL; 398 next_bcast.tv_sec += n*SUPPLY_INTERVAL; 399 400 continue; 401 } 402 403 if (timercmp(&t2, &wtime, <)) 404 wtime = t2; 405 } 406 407 /* If we need a flash update, either do it now or 408 * set the delay to end when it is time. 409 * 410 * If we are within MIN_WAITTIME seconds of a full update, 411 * do not bother. 412 */ 413 if (need_flash 414 && supplier 415 && no_flash.tv_sec+MIN_WAITTIME < next_bcast.tv_sec) { 416 /* accurate to the millisecond */ 417 if (!timercmp(&no_flash, &now, >)) 418 rip_bcast(1); 419 timevalsub(&t2, &no_flash, &now); 420 if (timercmp(&t2, &wtime, <)) 421 wtime = t2; 422 } 423 424 /* trigger the main aging timer. 425 */ 426 timevalsub(&t2, &age_timer, &now); 427 if (t2.tv_sec <= 0) { 428 age(0); 429 continue; 430 } 431 if (timercmp(&t2, &wtime, <)) 432 wtime = t2; 433 434 /* update the kernel routing table 435 */ 436 timevalsub(&t2, &need_kern, &now); 437 if (t2.tv_sec <= 0) { 438 age(0); 439 continue; 440 } 441 if (timercmp(&t2, &wtime, <)) 442 wtime = t2; 443 444 /* take care of router discovery, 445 * but do it to the millisecond 446 */ 447 if (!timercmp(&rdisc_timer, &now, >)) { 448 rdisc_age(0); 449 continue; 450 } 451 timevalsub(&t2, &rdisc_timer, &now); 452 if (timercmp(&t2, &wtime, <)) 453 wtime = t2; 454 455 456 /* wait for input or a timer to expire. 457 */ 458 trace_flush(); 459 ibits = fdbits; 460 n = select(sock_max, &ibits, 0, 0, &wtime); 461 if (n <= 0) { 462 if (n < 0 && errno != EINTR && errno != EAGAIN) 463 BADERR(1,"select"); 464 continue; 465 } 466 467 if (FD_ISSET(rt_sock, &ibits)) { 468 read_rt(); 469 n--; 470 } 471 if (rdisc_sock >= 0 && FD_ISSET(rdisc_sock, &ibits)) { 472 read_d(); 473 n--; 474 } 475 if (rip_sock >= 0 && FD_ISSET(rip_sock, &ibits)) { 476 read_rip(rip_sock, 0); 477 n--; 478 } 479 480 for (ifp = ifnet; n > 0 && 0 != ifp; ifp = ifp->int_next) { 481 if (ifp->int_rip_sock >= 0 482 && FD_ISSET(ifp->int_rip_sock, &ibits)) { 483 read_rip(ifp->int_rip_sock, ifp); 484 n--; 485 } 486 } 487 } 488 } 489 490 491 /* ARGSUSED */ 492 void 493 sigalrm(int sig) 494 { 495 /* Historically, SIGALRM would cause the daemon to check for 496 * new and broken interfaces. 497 */ 498 ifinit_timer.tv_sec = now.tv_sec; 499 trace_act("SIGALRM\n"); 500 } 501 502 503 /* watch for fatal signals */ 504 void 505 sigterm(int sig) 506 { 507 stopint = sig; 508 (void)signal(sig, SIG_DFL); /* catch it only once */ 509 } 510 511 512 void 513 fix_select(void) 514 { 515 struct interface *ifp; 516 517 518 FD_ZERO(&fdbits); 519 sock_max = 0; 520 521 FD_SET(rt_sock, &fdbits); 522 if (sock_max <= rt_sock) 523 sock_max = rt_sock+1; 524 if (rip_sock >= 0) { 525 FD_SET(rip_sock, &fdbits); 526 if (sock_max <= rip_sock) 527 sock_max = rip_sock+1; 528 } 529 for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) { 530 if (ifp->int_rip_sock >= 0) { 531 FD_SET(ifp->int_rip_sock, &fdbits); 532 if (sock_max <= ifp->int_rip_sock) 533 sock_max = ifp->int_rip_sock+1; 534 } 535 } 536 if (rdisc_sock >= 0) { 537 FD_SET(rdisc_sock, &fdbits); 538 if (sock_max <= rdisc_sock) 539 sock_max = rdisc_sock+1; 540 } 541 } 542 543 544 void 545 fix_sock(int sock, 546 char *name) 547 { 548 int on; 549 #define MIN_SOCKBUF (4*1024) 550 static int rbuf; 551 552 if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1) 553 logbad(1, "fcntl(%s) O_NONBLOCK: %s", 554 name, strerror(errno)); 555 on = 1; 556 if (setsockopt(sock, SOL_SOCKET,SO_BROADCAST, 557 &on,sizeof(on)) < 0) 558 msglog("setsockopt(%s,SO_BROADCAST): %s", 559 name, strerror(errno)); 560 if (rbuf >= MIN_SOCKBUF) { 561 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, 562 &rbuf, sizeof(rbuf)) < 0) 563 msglog("setsockopt(%s,SO_RCVBUF=%d): %s", 564 name, rbuf, strerror(errno)); 565 } else { 566 for (rbuf = 60*1024; ; rbuf -= 4096) { 567 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, 568 &rbuf, sizeof(rbuf)) == 0) { 569 trace_act("RCVBUF=%d\n", rbuf); 570 break; 571 } 572 if (rbuf < MIN_SOCKBUF) { 573 msglog("setsockopt(%s,SO_RCVBUF = %d): %s", 574 name, rbuf, strerror(errno)); 575 break; 576 } 577 } 578 } 579 } 580 581 582 /* get a rip socket 583 */ 584 static int /* <0 or file descriptor */ 585 get_rip_sock(naddr addr, 586 int serious) /* 1=failure to bind is serious */ 587 { 588 struct sockaddr_in sin; 589 unsigned char ttl; 590 int s; 591 592 593 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) 594 BADERR(1,"rip_sock = socket()"); 595 596 bzero(&sin,sizeof(sin)); 597 #ifdef _HAVE_SIN_LEN 598 sin.sin_len = sizeof(sin); 599 #endif 600 sin.sin_family = AF_INET; 601 sin.sin_port = htons(RIP_PORT); 602 sin.sin_addr.s_addr = addr; 603 if (bind(s, (struct sockaddr *)&sin,sizeof(sin)) < 0) { 604 if (serious) 605 BADERR(errno != EADDRINUSE, "bind(rip_sock)"); 606 return -1; 607 } 608 fix_sock(s,"rip_sock"); 609 610 ttl = 1; 611 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, 612 &ttl, sizeof(ttl)) < 0) 613 DBGERR(1,"rip_sock setsockopt(IP_MULTICAST_TTL)"); 614 615 return s; 616 } 617 618 619 /* turn off main RIP socket */ 620 void 621 rip_off(void) 622 { 623 struct interface *ifp; 624 register naddr addr; 625 626 627 if (rip_sock >= 0 && !mhome) { 628 trace_act("turn off RIP\n"); 629 630 (void)close(rip_sock); 631 rip_sock = -1; 632 633 /* get non-broadcast sockets to listen to queries. 634 */ 635 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 636 if (ifp->int_rip_sock < 0 637 && !(ifp->int_state & IS_ALIAS)) { 638 addr = ((ifp->int_if_flags & IFF_POINTOPOINT) 639 ? ifp->int_dstaddr 640 : ifp->int_addr); 641 ifp->int_rip_sock = get_rip_sock(addr, 0); 642 } 643 } 644 645 fix_select(); 646 647 age(0); 648 } 649 } 650 651 652 /* turn on RIP multicast input via an interface 653 */ 654 static void 655 rip_mcast_on(struct interface *ifp) 656 { 657 struct ip_mreq m; 658 659 if (!IS_RIP_IN_OFF(ifp->int_state) 660 && (ifp->int_if_flags & IFF_MULTICAST) 661 #ifdef MCAST_PPP_BUG 662 && !(ifp->int_if_flags & IFF_POINTOPOINT) 663 #endif 664 && !(ifp->int_state & IS_ALIAS)) { 665 m.imr_multiaddr.s_addr = htonl(INADDR_RIP_GROUP); 666 m.imr_interface.s_addr = ((ifp->int_if_flags & IFF_POINTOPOINT) 667 ? ifp->int_dstaddr 668 : ifp->int_addr); 669 if (setsockopt(rip_sock,IPPROTO_IP, IP_ADD_MEMBERSHIP, 670 &m, sizeof(m)) < 0) 671 LOGERR("setsockopt(IP_ADD_MEMBERSHIP RIP)"); 672 } 673 } 674 675 676 /* Prepare socket used for RIP. 677 */ 678 void 679 rip_on(struct interface *ifp) 680 { 681 /* If the main RIP socket is already alive, only start receiving 682 * multicasts for this interface. 683 */ 684 if (rip_sock >= 0) { 685 if (ifp != 0) 686 rip_mcast_on(ifp); 687 return; 688 } 689 690 /* If the main RIP socket is off, and it makes sense to turn it on, 691 * turn it on for all of the interfaces. 692 */ 693 if (rip_interfaces > 0 && !rdisc_ok) { 694 trace_act("turn on RIP\n"); 695 696 /* Close all of the query sockets so that we can open 697 * the main socket. SO_REUSEPORT is not a solution, 698 * since that would let two daemons bind to the broadcast 699 * socket. 700 */ 701 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 702 if (ifp->int_rip_sock >= 0) { 703 (void)close(ifp->int_rip_sock); 704 ifp->int_rip_sock = -1; 705 } 706 } 707 708 rip_sock = get_rip_sock(INADDR_ANY, 1); 709 rip_sock_mcast = 0; 710 711 /* Do not advertise anything until we have heard something 712 */ 713 if (next_bcast.tv_sec < now.tv_sec+MIN_WAITTIME) 714 next_bcast.tv_sec = now.tv_sec+MIN_WAITTIME; 715 716 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 717 if (!IS_RIP_IN_OFF(ifp->int_state)) 718 ifp->int_state &= ~IS_RIP_QUERIED; 719 rip_mcast_on(ifp); 720 } 721 722 ifinit_timer.tv_sec = now.tv_sec; 723 724 fix_select(); 725 726 } else if (ifp != 0 727 && ifp->int_rip_sock < 0 728 && !(ifp->int_state & IS_ALIAS)) { 729 /* RIP is off, so ensure there are sockets on which 730 * to listen for queries. 731 */ 732 ifp->int_rip_sock = get_rip_sock(ifp->int_addr, 0); 733 734 fix_select(); 735 } 736 } 737 738 739 /* die if malloc(3) fails 740 */ 741 void * 742 rtmalloc(size_t size, 743 char *msg) 744 { 745 void *p = malloc(size); 746 if (p == 0) 747 logbad(1,"malloc() failed in %s", msg); 748 return p; 749 } 750 751 752 /* get a random instant in an interval 753 */ 754 void 755 intvl_random(struct timeval *tp, /* put value here */ 756 u_long lo, /* value is after this second */ 757 u_long hi) /* and before this */ 758 { 759 tp->tv_sec = (time_t)(hi == lo 760 ? lo 761 : (lo + random() % ((hi - lo)))); 762 tp->tv_usec = random() % 1000000; 763 } 764 765 766 void 767 timevaladd(struct timeval *t1, 768 struct timeval *t2) 769 { 770 771 t1->tv_sec += t2->tv_sec; 772 if ((t1->tv_usec += t2->tv_usec) > 1000000) { 773 t1->tv_sec++; 774 t1->tv_usec -= 1000000; 775 } 776 } 777 778 779 /* t1 = t2 - t3 780 */ 781 static void 782 timevalsub(struct timeval *t1, 783 struct timeval *t2, 784 struct timeval *t3) 785 { 786 t1->tv_sec = t2->tv_sec - t3->tv_sec; 787 if ((t1->tv_usec = t2->tv_usec - t3->tv_usec) < 0) { 788 t1->tv_sec--; 789 t1->tv_usec += 1000000; 790 } 791 } 792 793 794 void 795 msglog(char *p, ...) 796 { 797 va_list args; 798 799 trace_flush(); 800 801 va_start(args, p); 802 vsyslog(LOG_ERR, p, args); 803 804 if (ftrace != 0) { 805 if (ftrace == stdout) 806 (void)fputs("routed: ", ftrace); 807 (void)vfprintf(ftrace, p, args); 808 (void)fputc('\n', ftrace); 809 } 810 } 811 812 813 void 814 logbad(int dump, char *p, ...) 815 { 816 va_list args; 817 818 trace_flush(); 819 820 va_start(args, p); 821 vsyslog(LOG_ERR, p, args); 822 823 (void)fputs("routed: ", stderr); 824 (void)vfprintf(stderr, p, args); 825 (void)fputs("; giving up\n",stderr); 826 (void)fflush(stderr); 827 828 if (dump) 829 abort(); 830 exit(1); 831 } 832