1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $FreeBSD$ 32 */ 33 34 #include "defs.h" 35 #include "pathnames.h" 36 #ifdef sgi 37 #include "math.h" 38 #endif 39 #include <signal.h> 40 #include <fcntl.h> 41 #include <sys/file.h> 42 43 __COPYRIGHT("@(#) Copyright (c) 1983, 1988, 1993 " 44 "The Regents of the University of California." 45 " All rights reserved."); 46 #ifdef __NetBSD__ 47 __RCSID("$NetBSD$"); 48 #include <util.h> 49 #elif defined(__FreeBSD__) 50 __RCSID("$FreeBSD$"); 51 #else 52 __RCSID("$Revision: 2.31 $"); 53 #ident "$Revision: 2.31 $" 54 #endif 55 56 pid_t mypid; 57 58 naddr myaddr; /* system address */ 59 static char myname[MAXHOSTNAMELEN+1]; 60 61 static int verbose; 62 63 int supplier; /* supply or broadcast updates */ 64 int supplier_set; 65 static int ipforwarding = 1; /* kernel forwarding on */ 66 67 static int default_gateway; /* 1=advertise default */ 68 static int background = 1; 69 int ridhosts; /* 1=reduce host routes */ 70 int mhome; /* 1=want multi-homed host route */ 71 int advertise_mhome; /* 1=must continue advertising it */ 72 int auth_ok = 1; /* 1=ignore auth if we do not care */ 73 int insecure; /* Reply to special queries or not */ 74 75 struct timeval epoch; /* when started */ 76 struct timeval clk; 77 static struct timeval prev_clk; 78 static int usec_fudge; 79 struct timeval now; /* current idea of time */ 80 time_t now_stale; 81 time_t now_expire; 82 time_t now_garbage; 83 84 static struct timeval next_bcast; /* next general broadcast */ 85 struct timeval no_flash = { /* inhibit flash update */ 86 EPOCH+SUPPLY_INTERVAL, 0 87 }; 88 89 static struct timeval flush_kern_timer; 90 91 static fd_set fdbits; 92 static int sock_max; 93 int rip_sock = -1; /* RIP socket */ 94 const struct interface *rip_sock_mcast; /* current multicast interface */ 95 int rt_sock; /* routing socket */ 96 int rt_sock_seqno; 97 98 99 static int get_rip_sock(naddr, int); 100 static void timevalsub(struct timeval *, struct timeval *, struct timeval *); 101 static void sigalrm(int s UNUSED); 102 static void sigterm(int sig); 103 104 int 105 main(int argc, 106 char *argv[]) 107 { 108 int n, mib[4], off; 109 size_t len; 110 char *p, *q; 111 const char *cp; 112 struct timeval wtime, t2; 113 time_t dt; 114 fd_set ibits; 115 naddr p_net, p_mask; 116 struct interface *ifp; 117 struct parm parm; 118 char *tracename = 0; 119 120 121 /* Some shells are badly broken and send SIGHUP to backgrounded 122 * processes. 123 */ 124 signal(SIGHUP, SIG_IGN); 125 126 openlog("routed", LOG_PID, LOG_DAEMON); 127 ftrace = stdout; 128 129 gettimeofday(&clk, 0); 130 prev_clk = clk; 131 epoch = clk; 132 epoch.tv_sec -= EPOCH; 133 now.tv_sec = EPOCH; 134 now_stale = EPOCH - STALE_TIME; 135 now_expire = EPOCH - EXPIRE_TIME; 136 now_garbage = EPOCH - GARBAGE_TIME; 137 wtime.tv_sec = 0; 138 139 (void)gethostname(myname, sizeof(myname)-1); 140 (void)gethost(myname, &myaddr); 141 142 while ((n = getopt(argc, argv, "isqdghmAtvT:F:P:")) != -1) { 143 switch (n) { 144 case 'i': 145 insecure++; 146 break; 147 case 's': 148 supplier = 1; 149 supplier_set = 1; 150 break; 151 152 case 'q': 153 supplier = 0; 154 supplier_set = 1; 155 break; 156 157 case 'd': 158 background = 0; 159 break; 160 161 case 'g': 162 memset(&parm, 0, sizeof(parm)); 163 parm.parm_d_metric = 1; 164 cp = check_parms(&parm); 165 if (cp != 0) 166 msglog("bad -g: %s", cp); 167 else 168 default_gateway = 1; 169 break; 170 171 case 'h': /* suppress extra host routes */ 172 ridhosts = 1; 173 break; 174 175 case 'm': /* advertise host route */ 176 mhome = 1; /* on multi-homed hosts */ 177 break; 178 179 case 'A': 180 /* Ignore authentication if we do not care. 181 * Crazy as it is, that is what RFC 1723 requires. 182 */ 183 auth_ok = 0; 184 break; 185 186 case 't': 187 new_tracelevel++; 188 break; 189 190 case 'T': 191 tracename = optarg; 192 break; 193 194 case 'F': /* minimal routes for SLIP */ 195 n = FAKE_METRIC; 196 p = strchr(optarg,','); 197 if (p && *p != '\0') { 198 n = (int)strtoul(p+1, &q, 0); 199 if (*q == '\0' 200 && n <= HOPCNT_INFINITY-1 201 && n >= 1) 202 *p = '\0'; 203 } 204 if (!getnet(optarg, &p_net, &p_mask)) { 205 msglog("bad network; \"-F %s\"", 206 optarg); 207 break; 208 } 209 memset(&parm, 0, sizeof(parm)); 210 parm.parm_net = p_net; 211 parm.parm_mask = p_mask; 212 parm.parm_d_metric = n; 213 cp = check_parms(&parm); 214 if (cp != 0) 215 msglog("bad -F: %s", cp); 216 break; 217 218 case 'P': 219 /* handle arbitrary parameters. 220 */ 221 q = strdup(optarg); 222 cp = parse_parms(q, 0); 223 if (cp != 0) 224 msglog("%s in \"-P %s\"", cp, optarg); 225 free(q); 226 break; 227 228 case 'v': 229 /* display version */ 230 verbose++; 231 msglog("version 2.31"); 232 break; 233 234 default: 235 goto usage; 236 } 237 } 238 argc -= optind; 239 argv += optind; 240 241 if (tracename == 0 && argc >= 1) { 242 tracename = *argv++; 243 argc--; 244 } 245 if (tracename != 0 && tracename[0] == '\0') 246 goto usage; 247 if (argc != 0) { 248 usage: 249 logbad(0, "usage: routed [-sqdghmAtv] [-T tracefile]" 250 " [-F net[,metric]] [-P parms]"); 251 } 252 if (geteuid() != 0) { 253 if (verbose) 254 exit(0); 255 logbad(0, "requires UID 0"); 256 } 257 258 mib[0] = CTL_NET; 259 mib[1] = PF_INET; 260 mib[2] = IPPROTO_IP; 261 mib[3] = IPCTL_FORWARDING; 262 len = sizeof(ipforwarding); 263 if (sysctl(mib, 4, &ipforwarding, &len, 0, 0) < 0) 264 LOGERR("sysctl(IPCTL_FORWARDING)"); 265 266 if (!ipforwarding) { 267 if (supplier) 268 msglog("-s incompatible with ipforwarding=0"); 269 if (default_gateway) { 270 msglog("-g incompatible with ipforwarding=0"); 271 default_gateway = 0; 272 } 273 supplier = 0; 274 supplier_set = 1; 275 } 276 if (default_gateway) { 277 if (supplier_set && !supplier) { 278 msglog("-g and -q incompatible"); 279 } else { 280 supplier = 1; 281 supplier_set = 1; 282 } 283 } 284 285 286 signal(SIGALRM, sigalrm); 287 if (!background) 288 signal(SIGHUP, sigterm); /* SIGHUP fatal during debugging */ 289 signal(SIGTERM, sigterm); 290 signal(SIGINT, sigterm); 291 signal(SIGUSR1, sigtrace_on); 292 signal(SIGUSR2, sigtrace_off); 293 294 /* get into the background */ 295 #ifdef sgi 296 if (0 > _daemonize(background ? 0 : (_DF_NOCHDIR|_DF_NOFORK), 297 STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO)) 298 BADERR(0, "_daemonize()"); 299 #else 300 if (background && daemon(0, 1) < 0) 301 BADERR(0,"daemon()"); 302 #endif 303 304 #if defined(__NetBSD__) 305 pidfile(0); 306 #endif 307 mypid = getpid(); 308 309 /* prepare socket connected to the kernel. 310 */ 311 rt_sock = socket(AF_ROUTE, SOCK_RAW, 0); 312 if (rt_sock < 0) 313 BADERR(1,"rt_sock = socket()"); 314 if (fcntl(rt_sock, F_SETFL, O_NONBLOCK) == -1) 315 logbad(1, "fcntl(rt_sock) O_NONBLOCK: %s", strerror(errno)); 316 off = 0; 317 if (setsockopt(rt_sock, SOL_SOCKET,SO_USELOOPBACK, 318 &off,sizeof(off)) < 0) 319 LOGERR("setsockopt(SO_USELOOPBACK,0)"); 320 321 fix_select(); 322 323 324 if (tracename != 0) { 325 strncpy(inittracename, tracename, sizeof(inittracename)-1); 326 set_tracefile(inittracename, "%s", -1); 327 } else { 328 tracelevel_msg("%s", -1); /* turn on tracing to stdio */ 329 } 330 331 bufinit(); 332 333 /* initialize radix tree */ 334 rtinit(); 335 336 /* Pick a random part of the second for our output to minimize 337 * collisions. 338 * 339 * Start broadcasting after hearing from other routers, and 340 * at a random time so a bunch of systems do not get synchronized 341 * after a power failure. 342 */ 343 intvl_random(&next_bcast, EPOCH+MIN_WAITTIME, EPOCH+SUPPLY_INTERVAL); 344 age_timer.tv_usec = next_bcast.tv_usec; 345 age_timer.tv_sec = EPOCH+MIN_WAITTIME; 346 rdisc_timer = next_bcast; 347 ifinit_timer.tv_usec = next_bcast.tv_usec; 348 349 /* Collect an initial view of the world by checking the interface 350 * configuration and the kludge file. 351 */ 352 gwkludge(); 353 ifinit(); 354 355 /* Ask for routes */ 356 rip_query(); 357 rdisc_sol(); 358 359 /* Now turn off stdio if not tracing */ 360 if (new_tracelevel == 0) 361 trace_close(background); 362 363 /* Loop forever, listening and broadcasting. 364 */ 365 for (;;) { 366 prev_clk = clk; 367 gettimeofday(&clk, 0); 368 if (prev_clk.tv_sec == clk.tv_sec 369 && prev_clk.tv_usec == clk.tv_usec+usec_fudge) { 370 /* Much of `routed` depends on time always advancing. 371 * On systems that do not guarantee that gettimeofday() 372 * produces unique timestamps even if called within 373 * a single tick, use trickery like that in classic 374 * BSD kernels. 375 */ 376 clk.tv_usec += ++usec_fudge; 377 378 } else { 379 usec_fudge = 0; 380 381 timevalsub(&t2, &clk, &prev_clk); 382 if (t2.tv_sec < 0 383 || t2.tv_sec > wtime.tv_sec + 5) { 384 /* Deal with time changes before other 385 * housekeeping to keep everything straight. 386 */ 387 dt = t2.tv_sec; 388 if (dt > 0) 389 dt -= wtime.tv_sec; 390 trace_act("time changed by %d sec", (int)dt); 391 epoch.tv_sec += dt; 392 } 393 } 394 timevalsub(&now, &clk, &epoch); 395 now_stale = now.tv_sec - STALE_TIME; 396 now_expire = now.tv_sec - EXPIRE_TIME; 397 now_garbage = now.tv_sec - GARBAGE_TIME; 398 399 /* deal with signals that should affect tracing */ 400 set_tracelevel(); 401 402 if (stopint != 0) { 403 rip_bcast(0); 404 rdisc_adv(); 405 trace_off("exiting with signal %d", stopint); 406 exit(stopint | 128); 407 } 408 409 /* look for new or dead interfaces */ 410 timevalsub(&wtime, &ifinit_timer, &now); 411 if (wtime.tv_sec <= 0) { 412 wtime.tv_sec = 0; 413 ifinit(); 414 rip_query(); 415 continue; 416 } 417 418 /* Check the kernel table occasionally for mysteriously 419 * evaporated routes 420 */ 421 timevalsub(&t2, &flush_kern_timer, &now); 422 if (t2.tv_sec <= 0) { 423 flush_kern(); 424 flush_kern_timer.tv_sec = (now.tv_sec 425 + CHECK_QUIET_INTERVAL); 426 continue; 427 } 428 if (timercmp(&t2, &wtime, <)) 429 wtime = t2; 430 431 /* If it is time, then broadcast our routes. 432 */ 433 if (supplier || advertise_mhome) { 434 timevalsub(&t2, &next_bcast, &now); 435 if (t2.tv_sec <= 0) { 436 /* Synchronize the aging and broadcast 437 * timers to minimize awakenings 438 */ 439 age(0); 440 441 rip_bcast(0); 442 443 /* It is desirable to send routing updates 444 * regularly. So schedule the next update 445 * 30 seconds after the previous one was 446 * scheduled, instead of 30 seconds after 447 * the previous update was finished. 448 * Even if we just started after discovering 449 * a 2nd interface or were otherwise delayed, 450 * pick a 30-second anniversary of the 451 * original broadcast time. 452 */ 453 n = 1 + (0-t2.tv_sec)/SUPPLY_INTERVAL; 454 next_bcast.tv_sec += n*SUPPLY_INTERVAL; 455 456 continue; 457 } 458 459 if (timercmp(&t2, &wtime, <)) 460 wtime = t2; 461 } 462 463 /* If we need a flash update, either do it now or 464 * set the delay to end when it is time. 465 * 466 * If we are within MIN_WAITTIME seconds of a full update, 467 * do not bother. 468 */ 469 if (need_flash 470 && supplier 471 && no_flash.tv_sec+MIN_WAITTIME < next_bcast.tv_sec) { 472 /* accurate to the millisecond */ 473 if (!timercmp(&no_flash, &now, >)) 474 rip_bcast(1); 475 timevalsub(&t2, &no_flash, &now); 476 if (timercmp(&t2, &wtime, <)) 477 wtime = t2; 478 } 479 480 /* trigger the main aging timer. 481 */ 482 timevalsub(&t2, &age_timer, &now); 483 if (t2.tv_sec <= 0) { 484 age(0); 485 continue; 486 } 487 if (timercmp(&t2, &wtime, <)) 488 wtime = t2; 489 490 /* update the kernel routing table 491 */ 492 timevalsub(&t2, &need_kern, &now); 493 if (t2.tv_sec <= 0) { 494 age(0); 495 continue; 496 } 497 if (timercmp(&t2, &wtime, <)) 498 wtime = t2; 499 500 /* take care of router discovery, 501 * but do it in the correct the millisecond 502 */ 503 if (!timercmp(&rdisc_timer, &now, >)) { 504 rdisc_age(0); 505 continue; 506 } 507 timevalsub(&t2, &rdisc_timer, &now); 508 if (timercmp(&t2, &wtime, <)) 509 wtime = t2; 510 511 512 /* wait for input or a timer to expire. 513 */ 514 trace_flush(); 515 ibits = fdbits; 516 n = select(sock_max, &ibits, 0, 0, &wtime); 517 if (n <= 0) { 518 if (n < 0 && errno != EINTR && errno != EAGAIN) 519 BADERR(1,"select"); 520 continue; 521 } 522 523 if (FD_ISSET(rt_sock, &ibits)) { 524 read_rt(); 525 n--; 526 } 527 if (rdisc_sock >= 0 && FD_ISSET(rdisc_sock, &ibits)) { 528 read_d(); 529 n--; 530 } 531 if (rip_sock >= 0 && FD_ISSET(rip_sock, &ibits)) { 532 read_rip(rip_sock, 0); 533 n--; 534 } 535 536 LIST_FOREACH(ifp, &ifnet, int_list) { 537 if (n <= 0) 538 break; 539 if (ifp->int_rip_sock >= 0 540 && FD_ISSET(ifp->int_rip_sock, &ibits)) { 541 read_rip(ifp->int_rip_sock, ifp); 542 n--; 543 } 544 } 545 } 546 } 547 548 549 /* ARGSUSED */ 550 static void 551 sigalrm(int s UNUSED) 552 { 553 /* Historically, SIGALRM would cause the daemon to check for 554 * new and broken interfaces. 555 */ 556 ifinit_timer.tv_sec = now.tv_sec; 557 trace_act("SIGALRM"); 558 } 559 560 561 /* watch for fatal signals */ 562 static void 563 sigterm(int sig) 564 { 565 stopint = sig; 566 (void)signal(sig, SIG_DFL); /* catch it only once */ 567 } 568 569 570 void 571 fix_select(void) 572 { 573 struct interface *ifp; 574 575 576 FD_ZERO(&fdbits); 577 sock_max = 0; 578 579 FD_SET(rt_sock, &fdbits); 580 if (sock_max <= rt_sock) 581 sock_max = rt_sock+1; 582 if (rip_sock >= 0) { 583 FD_SET(rip_sock, &fdbits); 584 if (sock_max <= rip_sock) 585 sock_max = rip_sock+1; 586 } 587 LIST_FOREACH(ifp, &ifnet, int_list) { 588 if (ifp->int_rip_sock >= 0) { 589 FD_SET(ifp->int_rip_sock, &fdbits); 590 if (sock_max <= ifp->int_rip_sock) 591 sock_max = ifp->int_rip_sock+1; 592 } 593 } 594 if (rdisc_sock >= 0) { 595 FD_SET(rdisc_sock, &fdbits); 596 if (sock_max <= rdisc_sock) 597 sock_max = rdisc_sock+1; 598 } 599 } 600 601 602 void 603 fix_sock(int sock, 604 const char *name) 605 { 606 int on; 607 #define MIN_SOCKBUF (4*1024) 608 static int rbuf; 609 610 if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1) 611 logbad(1, "fcntl(%s) O_NONBLOCK: %s", 612 name, strerror(errno)); 613 on = 1; 614 if (setsockopt(sock, SOL_SOCKET,SO_BROADCAST, &on,sizeof(on)) < 0) 615 msglog("setsockopt(%s,SO_BROADCAST): %s", 616 name, strerror(errno)); 617 #ifdef USE_PASSIFNAME 618 on = 1; 619 if (setsockopt(sock, SOL_SOCKET, SO_PASSIFNAME, &on,sizeof(on)) < 0) 620 msglog("setsockopt(%s,SO_PASSIFNAME): %s", 621 name, strerror(errno)); 622 #endif 623 624 if (rbuf >= MIN_SOCKBUF) { 625 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, 626 &rbuf, sizeof(rbuf)) < 0) 627 msglog("setsockopt(%s,SO_RCVBUF=%d): %s", 628 name, rbuf, strerror(errno)); 629 } else { 630 for (rbuf = 60*1024; ; rbuf -= 4096) { 631 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, 632 &rbuf, sizeof(rbuf)) == 0) { 633 trace_act("RCVBUF=%d", rbuf); 634 break; 635 } 636 if (rbuf < MIN_SOCKBUF) { 637 msglog("setsockopt(%s,SO_RCVBUF = %d): %s", 638 name, rbuf, strerror(errno)); 639 break; 640 } 641 } 642 } 643 } 644 645 646 /* get a rip socket 647 */ 648 static int /* <0 or file descriptor */ 649 get_rip_sock(naddr addr, 650 int serious) /* 1=failure to bind is serious */ 651 { 652 struct sockaddr_in rsin; 653 unsigned char ttl; 654 int s; 655 656 657 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) 658 BADERR(1,"rip_sock = socket()"); 659 660 memset(&rsin, 0, sizeof(rsin)); 661 #ifdef _HAVE_SIN_LEN 662 rsin.sin_len = sizeof(rsin); 663 #endif 664 rsin.sin_family = AF_INET; 665 rsin.sin_port = htons(RIP_PORT); 666 rsin.sin_addr.s_addr = addr; 667 if (bind(s, (struct sockaddr *)&rsin, sizeof(rsin)) < 0) { 668 if (serious) 669 BADERR(errno != EADDRINUSE, "bind(rip_sock)"); 670 close(s); 671 return -1; 672 } 673 fix_sock(s,"rip_sock"); 674 675 ttl = 1; 676 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, 677 &ttl, sizeof(ttl)) < 0) 678 DBGERR(1,"rip_sock setsockopt(IP_MULTICAST_TTL)"); 679 680 return s; 681 } 682 683 684 /* turn off main RIP socket */ 685 void 686 rip_off(void) 687 { 688 struct interface *ifp; 689 naddr addr; 690 691 692 if (rip_sock >= 0 && !mhome) { 693 trace_act("turn off RIP"); 694 695 (void)close(rip_sock); 696 rip_sock = -1; 697 698 /* get non-broadcast sockets to listen to queries. 699 */ 700 LIST_FOREACH(ifp, &ifnet, int_list) { 701 if (ifp->int_state & IS_REMOTE) 702 continue; 703 if (ifp->int_rip_sock < 0) { 704 addr = ((ifp->int_if_flags & IFF_POINTOPOINT) 705 ? ifp->int_dstaddr 706 : ifp->int_addr); 707 ifp->int_rip_sock = get_rip_sock(addr, 0); 708 } 709 } 710 711 fix_select(); 712 713 age(0); 714 } 715 } 716 717 718 /* turn on RIP multicast input via an interface 719 */ 720 static void 721 rip_mcast_on(struct interface *ifp) 722 { 723 struct group_req gr; 724 struct sockaddr_in *sin; 725 726 if (!IS_RIP_IN_OFF(ifp->int_state) 727 && (ifp->int_if_flags & IFF_MULTICAST) 728 && !(ifp->int_state & IS_ALIAS)) { 729 memset(&gr, 0, sizeof(gr)); 730 gr.gr_interface = ifp->int_index; 731 sin = (struct sockaddr_in *)&gr.gr_group; 732 sin->sin_family = AF_INET; 733 #ifdef _HAVE_SIN_LEN 734 sin->sin_len = sizeof(struct sockaddr_in); 735 #endif 736 sin->sin_addr.s_addr = htonl(INADDR_RIP_GROUP); 737 if (setsockopt(rip_sock, IPPROTO_IP, MCAST_JOIN_GROUP, 738 &gr, sizeof(gr)) < 0) 739 LOGERR("setsockopt(MCAST_JOIN_GROUP RIP)"); 740 } 741 } 742 743 744 /* Prepare socket used for RIP. 745 */ 746 void 747 rip_on(struct interface *ifp) 748 { 749 /* If the main RIP socket is already alive, only start receiving 750 * multicasts for this interface. 751 */ 752 if (rip_sock >= 0) { 753 if (ifp != NULL) 754 rip_mcast_on(ifp); 755 return; 756 } 757 758 /* If the main RIP socket is off and it makes sense to turn it on, 759 * then turn it on for all of the interfaces. 760 * It makes sense if either router discovery is off, or if 761 * router discover is on and at most one interface is doing RIP. 762 */ 763 if (rip_interfaces > 0 && (!rdisc_ok || rip_interfaces > 1)) { 764 trace_act("turn on RIP"); 765 766 /* Close all of the query sockets so that we can open 767 * the main socket. SO_REUSEPORT is not a solution, 768 * since that would let two daemons bind to the broadcast 769 * socket. 770 */ 771 LIST_FOREACH(ifp, &ifnet, int_list) { 772 if (ifp->int_rip_sock >= 0) { 773 (void)close(ifp->int_rip_sock); 774 ifp->int_rip_sock = -1; 775 } 776 } 777 778 rip_sock = get_rip_sock(INADDR_ANY, 1); 779 rip_sock_mcast = NULL; 780 781 /* Do not advertise anything until we have heard something 782 */ 783 if (next_bcast.tv_sec < now.tv_sec+MIN_WAITTIME) 784 next_bcast.tv_sec = now.tv_sec+MIN_WAITTIME; 785 786 LIST_FOREACH(ifp, &ifnet, int_list) { 787 ifp->int_query_time = NEVER; 788 rip_mcast_on(ifp); 789 } 790 ifinit_timer.tv_sec = now.tv_sec; 791 792 } else if (ifp != NULL 793 && !(ifp->int_state & IS_REMOTE) 794 && ifp->int_rip_sock < 0) { 795 /* RIP is off, so ensure there are sockets on which 796 * to listen for queries. 797 */ 798 ifp->int_rip_sock = get_rip_sock(ifp->int_addr, 0); 799 } 800 801 fix_select(); 802 } 803 804 805 /* die if malloc(3) fails 806 */ 807 void * 808 rtmalloc(size_t size, 809 const char *msg) 810 { 811 void *p = malloc(size); 812 if (p == NULL) 813 logbad(1,"malloc(%lu) failed in %s", (u_long)size, msg); 814 return p; 815 } 816 817 818 /* get a random instant in an interval 819 */ 820 void 821 intvl_random(struct timeval *tp, /* put value here */ 822 u_long lo, /* value is after this second */ 823 u_long hi) /* and before this */ 824 { 825 tp->tv_sec = (time_t)(hi == lo 826 ? lo 827 : (lo + arc4random_uniform(1 + hi - lo))); 828 tp->tv_usec = arc4random_uniform(1000000); 829 } 830 831 832 void 833 timevaladd(struct timeval *t1, 834 struct timeval *t2) 835 { 836 837 t1->tv_sec += t2->tv_sec; 838 if ((t1->tv_usec += t2->tv_usec) >= 1000000) { 839 t1->tv_sec++; 840 t1->tv_usec -= 1000000; 841 } 842 } 843 844 845 /* t1 = t2 - t3 846 */ 847 static void 848 timevalsub(struct timeval *t1, 849 struct timeval *t2, 850 struct timeval *t3) 851 { 852 t1->tv_sec = t2->tv_sec - t3->tv_sec; 853 if ((t1->tv_usec = t2->tv_usec - t3->tv_usec) < 0) { 854 t1->tv_sec--; 855 t1->tv_usec += 1000000; 856 } 857 } 858 859 860 /* put a message into the system log 861 */ 862 void 863 msglog(const char *p, ...) 864 { 865 va_list args; 866 867 trace_flush(); 868 869 va_start(args, p); 870 vsyslog(LOG_ERR, p, args); 871 va_end(args); 872 if (ftrace != NULL) { 873 if (ftrace == stdout) 874 (void)fputs("routed: ", ftrace); 875 va_start(args, p); 876 (void)vfprintf(ftrace, p, args); 877 va_end(args); 878 (void)fputc('\n', ftrace); 879 } 880 } 881 882 883 /* Put a message about a bad system into the system log if 884 * we have not complained about it recently. 885 * 886 * It is desirable to complain about all bad systems, but not too often. 887 * In the worst case, it is not practical to keep track of all bad systems. 888 * For example, there can be many systems with the wrong password. 889 */ 890 void 891 msglim(struct msg_limit *lim, naddr addr, const char *p, ...) 892 { 893 va_list args; 894 int i; 895 struct msg_sub *ms1, *ms; 896 const char *p1; 897 898 /* look for the oldest slot in the table 899 * or the slot for the bad router. 900 */ 901 ms = ms1 = lim->subs; 902 for (i = MSG_SUBJECT_N; ; i--, ms1++) { 903 if (i == 0) { 904 /* Reuse a slot at most once every 10 minutes. 905 */ 906 if (lim->reuse > now.tv_sec) { 907 ms = NULL; 908 } else { 909 ms = ms1; 910 lim->reuse = now.tv_sec + 10*60; 911 } 912 break; 913 } 914 if (ms->addr == addr) { 915 /* Repeat a complaint about a given system at 916 * most once an hour. 917 */ 918 if (ms->until > now.tv_sec) 919 ms = NULL; 920 break; 921 } 922 if (ms->until < ms1->until) 923 ms = ms1; 924 } 925 if (ms != NULL) { 926 ms->addr = addr; 927 ms->until = now.tv_sec + 60*60; /* 60 minutes */ 928 929 trace_flush(); 930 for (p1 = p; *p1 == ' '; p1++) 931 continue; 932 va_start(args, p); 933 vsyslog(LOG_ERR, p1, args); 934 va_end(args); 935 } 936 937 /* always display the message if tracing */ 938 if (ftrace != NULL) { 939 va_start(args, p); 940 (void)vfprintf(ftrace, p, args); 941 va_end(args); 942 (void)fputc('\n', ftrace); 943 } 944 } 945 946 947 void 948 logbad(int dump, const char *p, ...) 949 { 950 va_list args; 951 952 trace_flush(); 953 954 va_start(args, p); 955 vsyslog(LOG_ERR, p, args); 956 va_end(args); 957 (void)fputs("routed: ", stderr); 958 va_start(args, p); 959 (void)vfprintf(stderr, p, args); 960 va_end(args); 961 (void)fputs("; giving up\n",stderr); 962 (void)fflush(stderr); 963 964 if (dump) 965 abort(); 966 exit(1); 967 } 968