1 /* 2 * Copyright (c) 1983, 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 #include "defs.h" 33 #include "pathnames.h" 34 #ifdef sgi 35 #include "math.h" 36 #endif 37 #include <signal.h> 38 #include <fcntl.h> 39 #include <sys/file.h> 40 41 __COPYRIGHT("@(#) Copyright (c) 1983, 1988, 1993 " 42 "The Regents of the University of California." 43 " All rights reserved."); 44 #ifdef __NetBSD__ 45 __RCSID("$NetBSD$"); 46 #include <util.h> 47 #elif defined(__FreeBSD__) 48 __RCSID("$FreeBSD$"); 49 #else 50 __RCSID("$Revision: 2.31 $"); 51 #ident "$Revision: 2.31 $" 52 #endif 53 54 pid_t mypid; 55 56 naddr myaddr; /* system address */ 57 static char myname[MAXHOSTNAMELEN+1]; 58 59 static int verbose; 60 61 int supplier; /* supply or broadcast updates */ 62 int supplier_set; 63 static int ipforwarding = 1; /* kernel forwarding on */ 64 65 static int default_gateway; /* 1=advertise default */ 66 static 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 advertising it */ 70 int auth_ok = 1; /* 1=ignore auth if we do not care */ 71 int insecure; /* Reply to special queries or not */ 72 73 struct timeval epoch; /* when started */ 74 struct timeval clk; 75 static struct timeval prev_clk; 76 static int usec_fudge; 77 struct timeval now; /* current idea of time */ 78 time_t now_stale; 79 time_t now_expire; 80 time_t now_garbage; 81 82 static struct timeval next_bcast; /* next general broadcast */ 83 struct timeval no_flash = { /* inhibit flash update */ 84 EPOCH+SUPPLY_INTERVAL, 0 85 }; 86 87 static struct timeval flush_kern_timer; 88 89 static fd_set fdbits; 90 static int sock_max; 91 int rip_sock = -1; /* RIP socket */ 92 const struct interface *rip_sock_mcast; /* current multicast interface */ 93 int rt_sock; /* routing socket */ 94 int rt_sock_seqno; 95 96 97 static int get_rip_sock(naddr, int); 98 static void timevalsub(struct timeval *, struct timeval *, struct timeval *); 99 static void sigalrm(int s UNUSED); 100 static void sigterm(int sig); 101 102 int 103 main(int argc, 104 char *argv[]) 105 { 106 int n, mib[4], off; 107 size_t len; 108 char *p, *q; 109 const char *cp; 110 struct timeval wtime, t2; 111 time_t dt; 112 fd_set ibits; 113 naddr p_net, p_mask; 114 struct interface *ifp; 115 struct parm parm; 116 char *tracename = 0; 117 118 119 /* Some shells are badly broken and send SIGHUP to backgrounded 120 * processes. 121 */ 122 signal(SIGHUP, SIG_IGN); 123 124 openlog("routed", LOG_PID, LOG_DAEMON); 125 ftrace = stdout; 126 127 gettimeofday(&clk, 0); 128 prev_clk = clk; 129 epoch = clk; 130 epoch.tv_sec -= EPOCH; 131 now.tv_sec = EPOCH; 132 now_stale = EPOCH - STALE_TIME; 133 now_expire = EPOCH - EXPIRE_TIME; 134 now_garbage = EPOCH - GARBAGE_TIME; 135 wtime.tv_sec = 0; 136 137 (void)gethostname(myname, sizeof(myname)-1); 138 (void)gethost(myname, &myaddr); 139 140 while ((n = getopt(argc, argv, "isqdghmAtvT:F:P:")) != -1) { 141 switch (n) { 142 case 'i': 143 insecure++; 144 break; 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 2.31"); 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[,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(0); 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 strncpy(inittracename, tracename, sizeof(inittracename)-1); 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 occasionally 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 anniversary 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 ibits = fdbits; 514 n = select(sock_max, &ibits, 0, 0, &wtime); 515 if (n <= 0) { 516 if (n < 0 && errno != EINTR && errno != EAGAIN) 517 BADERR(1,"select"); 518 continue; 519 } 520 521 if (FD_ISSET(rt_sock, &ibits)) { 522 read_rt(); 523 n--; 524 } 525 if (rdisc_sock >= 0 && FD_ISSET(rdisc_sock, &ibits)) { 526 read_d(); 527 n--; 528 } 529 if (rip_sock >= 0 && FD_ISSET(rip_sock, &ibits)) { 530 read_rip(rip_sock, 0); 531 n--; 532 } 533 534 LIST_FOREACH(ifp, &ifnet, int_list) { 535 if (n <= 0) 536 break; 537 if (ifp->int_rip_sock >= 0 538 && FD_ISSET(ifp->int_rip_sock, &ibits)) { 539 read_rip(ifp->int_rip_sock, ifp); 540 n--; 541 } 542 } 543 } 544 } 545 546 547 /* ARGSUSED */ 548 static void 549 sigalrm(int s UNUSED) 550 { 551 /* Historically, SIGALRM would cause the daemon to check for 552 * new and broken interfaces. 553 */ 554 ifinit_timer.tv_sec = now.tv_sec; 555 trace_act("SIGALRM"); 556 } 557 558 559 /* watch for fatal signals */ 560 static void 561 sigterm(int sig) 562 { 563 stopint = sig; 564 (void)signal(sig, SIG_DFL); /* catch it only once */ 565 } 566 567 568 void 569 fix_select(void) 570 { 571 struct interface *ifp; 572 573 574 FD_ZERO(&fdbits); 575 sock_max = 0; 576 577 FD_SET(rt_sock, &fdbits); 578 if (sock_max <= rt_sock) 579 sock_max = rt_sock+1; 580 if (rip_sock >= 0) { 581 FD_SET(rip_sock, &fdbits); 582 if (sock_max <= rip_sock) 583 sock_max = rip_sock+1; 584 } 585 LIST_FOREACH(ifp, &ifnet, int_list) { 586 if (ifp->int_rip_sock >= 0) { 587 FD_SET(ifp->int_rip_sock, &fdbits); 588 if (sock_max <= ifp->int_rip_sock) 589 sock_max = ifp->int_rip_sock+1; 590 } 591 } 592 if (rdisc_sock >= 0) { 593 FD_SET(rdisc_sock, &fdbits); 594 if (sock_max <= rdisc_sock) 595 sock_max = rdisc_sock+1; 596 } 597 } 598 599 600 void 601 fix_sock(int sock, 602 const char *name) 603 { 604 int on; 605 #define MIN_SOCKBUF (4*1024) 606 static int rbuf; 607 608 if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1) 609 logbad(1, "fcntl(%s) O_NONBLOCK: %s", 610 name, strerror(errno)); 611 on = 1; 612 if (setsockopt(sock, SOL_SOCKET,SO_BROADCAST, &on,sizeof(on)) < 0) 613 msglog("setsockopt(%s,SO_BROADCAST): %s", 614 name, strerror(errno)); 615 #ifdef USE_PASSIFNAME 616 on = 1; 617 if (setsockopt(sock, SOL_SOCKET, SO_PASSIFNAME, &on,sizeof(on)) < 0) 618 msglog("setsockopt(%s,SO_PASSIFNAME): %s", 619 name, strerror(errno)); 620 #endif 621 622 if (rbuf >= MIN_SOCKBUF) { 623 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, 624 &rbuf, sizeof(rbuf)) < 0) 625 msglog("setsockopt(%s,SO_RCVBUF=%d): %s", 626 name, rbuf, strerror(errno)); 627 } else { 628 for (rbuf = 60*1024; ; rbuf -= 4096) { 629 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, 630 &rbuf, sizeof(rbuf)) == 0) { 631 trace_act("RCVBUF=%d", rbuf); 632 break; 633 } 634 if (rbuf < MIN_SOCKBUF) { 635 msglog("setsockopt(%s,SO_RCVBUF = %d): %s", 636 name, rbuf, strerror(errno)); 637 break; 638 } 639 } 640 } 641 } 642 643 644 /* get a rip socket 645 */ 646 static int /* <0 or file descriptor */ 647 get_rip_sock(naddr addr, 648 int serious) /* 1=failure to bind is serious */ 649 { 650 struct sockaddr_in rsin; 651 unsigned char ttl; 652 int s; 653 654 655 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) 656 BADERR(1,"rip_sock = socket()"); 657 658 memset(&rsin, 0, sizeof(rsin)); 659 #ifdef _HAVE_SIN_LEN 660 rsin.sin_len = sizeof(rsin); 661 #endif 662 rsin.sin_family = AF_INET; 663 rsin.sin_port = htons(RIP_PORT); 664 rsin.sin_addr.s_addr = addr; 665 if (bind(s, (struct sockaddr *)&rsin, sizeof(rsin)) < 0) { 666 if (serious) 667 BADERR(errno != EADDRINUSE, "bind(rip_sock)"); 668 return -1; 669 } 670 fix_sock(s,"rip_sock"); 671 672 ttl = 1; 673 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, 674 &ttl, sizeof(ttl)) < 0) 675 DBGERR(1,"rip_sock setsockopt(IP_MULTICAST_TTL)"); 676 677 return s; 678 } 679 680 681 /* turn off main RIP socket */ 682 void 683 rip_off(void) 684 { 685 struct interface *ifp; 686 naddr addr; 687 688 689 if (rip_sock >= 0 && !mhome) { 690 trace_act("turn off RIP"); 691 692 (void)close(rip_sock); 693 rip_sock = -1; 694 695 /* get non-broadcast sockets to listen to queries. 696 */ 697 LIST_FOREACH(ifp, &ifnet, int_list) { 698 if (ifp->int_state & IS_REMOTE) 699 continue; 700 if (ifp->int_rip_sock < 0) { 701 addr = ((ifp->int_if_flags & IFF_POINTOPOINT) 702 ? ifp->int_dstaddr 703 : ifp->int_addr); 704 ifp->int_rip_sock = get_rip_sock(addr, 0); 705 } 706 } 707 708 fix_select(); 709 710 age(0); 711 } 712 } 713 714 715 /* turn on RIP multicast input via an interface 716 */ 717 static void 718 rip_mcast_on(struct interface *ifp) 719 { 720 struct group_req gr; 721 struct sockaddr_in *sin; 722 723 if (!IS_RIP_IN_OFF(ifp->int_state) 724 && (ifp->int_if_flags & IFF_MULTICAST) 725 && !(ifp->int_state & IS_ALIAS)) { 726 memset(&gr, 0, sizeof(gr)); 727 gr.gr_interface = ifp->int_index; 728 sin = (struct sockaddr_in *)&gr.gr_group; 729 sin->sin_family = AF_INET; 730 #ifdef _HAVE_SIN_LEN 731 sin->sin_len = sizeof(struct sockaddr_in); 732 #endif 733 sin->sin_addr.s_addr = htonl(INADDR_RIP_GROUP); 734 if (setsockopt(rip_sock, IPPROTO_IP, MCAST_JOIN_GROUP, 735 &gr, sizeof(gr)) < 0) 736 LOGERR("setsockopt(MCAST_JOIN_GROUP RIP)"); 737 } 738 } 739 740 741 /* Prepare socket used for RIP. 742 */ 743 void 744 rip_on(struct interface *ifp) 745 { 746 /* If the main RIP socket is already alive, only start receiving 747 * multicasts for this interface. 748 */ 749 if (rip_sock >= 0) { 750 if (ifp != NULL) 751 rip_mcast_on(ifp); 752 return; 753 } 754 755 /* If the main RIP socket is off and it makes sense to turn it on, 756 * then turn it on for all of the interfaces. 757 * It makes sense if either router discovery is off, or if 758 * router discover is on and at most one interface is doing RIP. 759 */ 760 if (rip_interfaces > 0 && (!rdisc_ok || rip_interfaces > 1)) { 761 trace_act("turn on RIP"); 762 763 /* Close all of the query sockets so that we can open 764 * the main socket. SO_REUSEPORT is not a solution, 765 * since that would let two daemons bind to the broadcast 766 * socket. 767 */ 768 LIST_FOREACH(ifp, &ifnet, int_list) { 769 if (ifp->int_rip_sock >= 0) { 770 (void)close(ifp->int_rip_sock); 771 ifp->int_rip_sock = -1; 772 } 773 } 774 775 rip_sock = get_rip_sock(INADDR_ANY, 1); 776 rip_sock_mcast = NULL; 777 778 /* Do not advertise anything until we have heard something 779 */ 780 if (next_bcast.tv_sec < now.tv_sec+MIN_WAITTIME) 781 next_bcast.tv_sec = now.tv_sec+MIN_WAITTIME; 782 783 LIST_FOREACH(ifp, &ifnet, int_list) { 784 ifp->int_query_time = NEVER; 785 rip_mcast_on(ifp); 786 } 787 ifinit_timer.tv_sec = now.tv_sec; 788 789 } else if (ifp != NULL 790 && !(ifp->int_state & IS_REMOTE) 791 && ifp->int_rip_sock < 0) { 792 /* RIP is off, so ensure there are sockets on which 793 * to listen for queries. 794 */ 795 ifp->int_rip_sock = get_rip_sock(ifp->int_addr, 0); 796 } 797 798 fix_select(); 799 } 800 801 802 /* die if malloc(3) fails 803 */ 804 void * 805 rtmalloc(size_t size, 806 const char *msg) 807 { 808 void *p = malloc(size); 809 if (p == NULL) 810 logbad(1,"malloc(%lu) failed in %s", (u_long)size, msg); 811 return p; 812 } 813 814 815 /* get a random instant in an interval 816 */ 817 void 818 intvl_random(struct timeval *tp, /* put value here */ 819 u_long lo, /* value is after this second */ 820 u_long hi) /* and before this */ 821 { 822 tp->tv_sec = (time_t)(hi == lo 823 ? lo 824 : (lo + arc4random_uniform(1 + hi - lo))); 825 tp->tv_usec = arc4random_uniform(1000000); 826 } 827 828 829 void 830 timevaladd(struct timeval *t1, 831 struct timeval *t2) 832 { 833 834 t1->tv_sec += t2->tv_sec; 835 if ((t1->tv_usec += t2->tv_usec) >= 1000000) { 836 t1->tv_sec++; 837 t1->tv_usec -= 1000000; 838 } 839 } 840 841 842 /* t1 = t2 - t3 843 */ 844 static void 845 timevalsub(struct timeval *t1, 846 struct timeval *t2, 847 struct timeval *t3) 848 { 849 t1->tv_sec = t2->tv_sec - t3->tv_sec; 850 if ((t1->tv_usec = t2->tv_usec - t3->tv_usec) < 0) { 851 t1->tv_sec--; 852 t1->tv_usec += 1000000; 853 } 854 } 855 856 857 /* put a message into the system log 858 */ 859 void 860 msglog(const char *p, ...) 861 { 862 va_list args; 863 864 trace_flush(); 865 866 va_start(args, p); 867 vsyslog(LOG_ERR, p, args); 868 va_end(args); 869 if (ftrace != NULL) { 870 if (ftrace == stdout) 871 (void)fputs("routed: ", ftrace); 872 va_start(args, p); 873 (void)vfprintf(ftrace, p, args); 874 va_end(args); 875 (void)fputc('\n', ftrace); 876 } 877 } 878 879 880 /* Put a message about a bad system into the system log if 881 * we have not complained about it recently. 882 * 883 * It is desirable to complain about all bad systems, but not too often. 884 * In the worst case, it is not practical to keep track of all bad systems. 885 * For example, there can be many systems with the wrong password. 886 */ 887 void 888 msglim(struct msg_limit *lim, naddr addr, const char *p, ...) 889 { 890 va_list args; 891 int i; 892 struct msg_sub *ms1, *ms; 893 const char *p1; 894 895 /* look for the oldest slot in the table 896 * or the slot for the bad router. 897 */ 898 ms = ms1 = lim->subs; 899 for (i = MSG_SUBJECT_N; ; i--, ms1++) { 900 if (i == 0) { 901 /* Reuse a slot at most once every 10 minutes. 902 */ 903 if (lim->reuse > now.tv_sec) { 904 ms = NULL; 905 } else { 906 ms = ms1; 907 lim->reuse = now.tv_sec + 10*60; 908 } 909 break; 910 } 911 if (ms->addr == addr) { 912 /* Repeat a complaint about a given system at 913 * most once an hour. 914 */ 915 if (ms->until > now.tv_sec) 916 ms = NULL; 917 break; 918 } 919 if (ms->until < ms1->until) 920 ms = ms1; 921 } 922 if (ms != NULL) { 923 ms->addr = addr; 924 ms->until = now.tv_sec + 60*60; /* 60 minutes */ 925 926 trace_flush(); 927 for (p1 = p; *p1 == ' '; p1++) 928 continue; 929 va_start(args, p); 930 vsyslog(LOG_ERR, p1, args); 931 va_end(args); 932 } 933 934 /* always display the message if tracing */ 935 if (ftrace != NULL) { 936 va_start(args, p); 937 (void)vfprintf(ftrace, p, args); 938 va_end(args); 939 (void)fputc('\n', ftrace); 940 } 941 } 942 943 944 void 945 logbad(int dump, const char *p, ...) 946 { 947 va_list args; 948 949 trace_flush(); 950 951 va_start(args, p); 952 vsyslog(LOG_ERR, p, args); 953 va_end(args); 954 (void)fputs("routed: ", stderr); 955 va_start(args, p); 956 (void)vfprintf(stderr, p, args); 957 va_end(args); 958 (void)fputs("; giving up\n",stderr); 959 (void)fflush(stderr); 960 961 if (dump) 962 abort(); 963 exit(1); 964 } 965