1 /* $NetBSD: main.c,v 1.43 2022/04/07 19:33:37 andvar 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 #include "defs.h" 37 #include "pathnames.h" 38 #if defined(__NetBSD__) 39 #include <util.h> 40 #endif 41 #include <signal.h> 42 #include <fcntl.h> 43 #include <sys/file.h> 44 45 __COPYRIGHT("@(#) Copyright (c) 1983, 1988, 1993\ 46 The Regents of the University of California. All rights reserved."); 47 #ifdef __NetBSD__ 48 __RCSID("$NetBSD: main.c,v 1.43 2022/04/07 19:33:37 andvar Exp $"); 49 #elif defined(__FreeBSD__) 50 __RCSID("$FreeBSD$"); 51 #else 52 __RCSID("Revision: 2.27 "); 53 #ident "Revision: 2.27 " 54 #endif 55 56 pid_t mypid; 57 58 naddr myaddr; /* system address */ 59 char myname[MAXHOSTNAMELEN+1]; 60 61 int verbose; 62 63 int supplier; /* supply or broadcast updates */ 64 int supplier_set; 65 int ipforwarding = 1; /* kernel forwarding on */ 66 67 int default_gateway; /* 1=advertise default */ 68 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 74 struct timeval epoch; /* when started */ 75 struct timeval clk, 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 struct timeval next_bcast; /* next general broadcast */ 83 struct timeval no_flash = { /* inhibit flash update */ 84 EPOCH+SUPPLY_INTERVAL, 0 85 }; 86 87 struct timeval flush_kern_timer; 88 89 fd_set *fdbitsp; 90 int sock_max; 91 int rip_sock = -1; /* RIP socket */ 92 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 *); 99 100 int 101 main(int argc, 102 char *argv[]) 103 { 104 int n, mib[4], off; 105 size_t len; 106 char *p, *q; 107 const char *cp; 108 struct timeval wtime, t2; 109 time_t dt; 110 fd_set *ibitsp = NULL; 111 naddr p_net, p_mask; 112 struct interface *ifp; 113 struct parm parm; 114 char *tracename = 0; 115 116 117 /* Some shells are badly broken and send SIGHUP to backgrounded 118 * processes. 119 */ 120 signal(SIGHUP, SIG_IGN); 121 122 openlog("routed", LOG_PID, LOG_DAEMON); 123 ftrace = stdout; 124 125 gettimeofday(&clk, 0); 126 prev_clk = clk; 127 epoch = clk; 128 epoch.tv_sec -= EPOCH; 129 now.tv_sec = EPOCH; 130 now_stale = EPOCH - STALE_TIME; 131 now_expire = EPOCH - EXPIRE_TIME; 132 now_garbage = EPOCH - GARBAGE_TIME; 133 wtime.tv_sec = 0; 134 135 (void)gethostname(myname, sizeof(myname) - 1); 136 (void)gethost(myname, &myaddr); 137 138 while ((n = getopt(argc, argv, "sqdghmAtvT:F:P:")) != -1) { 139 switch (n) { 140 case 's': 141 supplier = 1; 142 supplier_set = 1; 143 break; 144 145 case 'q': 146 supplier = 0; 147 supplier_set = 1; 148 break; 149 150 case 'd': 151 background = 0; 152 break; 153 154 case 'g': 155 memset(&parm, 0, sizeof(parm)); 156 parm.parm_d_metric = 1; 157 cp = check_parms(&parm); 158 if (cp != 0) 159 msglog("bad -g: %s", cp); 160 else 161 default_gateway = 1; 162 break; 163 164 case 'h': /* suppress extra host routes */ 165 ridhosts = 1; 166 break; 167 168 case 'm': /* advertise host route */ 169 mhome = 1; /* on multi-homed hosts */ 170 break; 171 172 case 'A': 173 /* Ignore authentication if we do not care. 174 * Crazy as it is, that is what RFC 1723 requires. 175 */ 176 auth_ok = 0; 177 break; 178 179 case 't': 180 new_tracelevel++; 181 break; 182 183 case 'T': 184 tracename = optarg; 185 break; 186 187 case 'F': /* minimal routes for SLIP */ 188 n = FAKE_METRIC; 189 p = strchr(optarg,','); 190 if (p && *p != '\0') { 191 n = (int)strtoul(p+1, &q, 0); 192 if (*q == '\0' 193 && n <= HOPCNT_INFINITY-1 194 && n >= 1) 195 *p = '\0'; 196 } 197 if (!getnet(optarg, &p_net, &p_mask)) { 198 msglog("bad network; \"-F %s\"", 199 optarg); 200 break; 201 } 202 memset(&parm, 0, sizeof(parm)); 203 parm.parm_net = p_net; 204 parm.parm_mask = p_mask; 205 parm.parm_d_metric = n; 206 cp = check_parms(&parm); 207 if (cp != 0) 208 msglog("bad -F: %s", cp); 209 break; 210 211 case 'P': 212 /* handle arbitrary parameters. 213 */ 214 q = strdup(optarg); 215 cp = parse_parms(q, 0); 216 if (cp != 0) 217 msglog("%s in \"-P %s\"", cp, optarg); 218 free(q); 219 break; 220 221 case 'v': 222 /* display version */ 223 verbose++; 224 msglog("version 2.32"); 225 break; 226 227 default: 228 goto usage; 229 } 230 } 231 argc -= optind; 232 argv += optind; 233 234 if (tracename == 0 && argc >= 1) { 235 tracename = *argv++; 236 argc--; 237 } 238 if (tracename != 0 && tracename[0] == '\0') 239 goto usage; 240 if (argc != 0) { 241 usage: 242 logbad(0, "usage: routed [-sqdghmAtv] [-T tracefile]" 243 " [-F net[/mask[,metric]]] [-P parms]"); 244 } 245 if (geteuid() != 0) { 246 if (verbose) 247 exit(0); 248 logbad(0, "requires UID 0"); 249 } 250 251 mib[0] = CTL_NET; 252 mib[1] = PF_INET; 253 mib[2] = IPPROTO_IP; 254 mib[3] = IPCTL_FORWARDING; 255 len = sizeof(ipforwarding); 256 if (sysctl(mib, 4, &ipforwarding, &len, 0, 0) < 0) 257 LOGERR("sysctl(IPCTL_FORWARDING)"); 258 259 if (!ipforwarding) { 260 if (supplier) 261 msglog("-s incompatible with ipforwarding=0"); 262 if (default_gateway) { 263 msglog("-g incompatible with ipforwarding=0"); 264 default_gateway = 0; 265 } 266 supplier = 0; 267 supplier_set = 1; 268 } 269 if (default_gateway) { 270 if (supplier_set && !supplier) { 271 msglog("-g and -q incompatible"); 272 } else { 273 supplier = 1; 274 supplier_set = 1; 275 } 276 } 277 278 279 signal(SIGALRM, sigalrm); 280 if (!background) 281 signal(SIGHUP, sigterm); /* SIGHUP fatal during debugging */ 282 signal(SIGTERM, sigterm); 283 signal(SIGINT, sigterm); 284 signal(SIGUSR1, sigtrace_on); 285 signal(SIGUSR2, sigtrace_off); 286 287 /* get into the background */ 288 if (background && daemon(0, 1) < 0) 289 BADERR(0,"daemon()"); 290 291 #if defined(__NetBSD__) 292 pidfile(NULL); 293 #endif 294 mypid = getpid(); 295 296 /* prepare socket connected to the kernel. 297 */ 298 rt_sock = socket(AF_ROUTE, SOCK_RAW, 0); 299 if (rt_sock < 0) 300 BADERR(1,"rt_sock = socket()"); 301 if (fcntl(rt_sock, F_SETFL, O_NONBLOCK) == -1) 302 logbad(1, "fcntl(rt_sock) O_NONBLOCK: %s", strerror(errno)); 303 off = 0; 304 if (setsockopt(rt_sock, SOL_SOCKET,SO_USELOOPBACK, 305 &off,sizeof(off)) < 0) 306 LOGERR("setsockopt(SO_USELOOPBACK,0)"); 307 308 fix_select(); 309 310 311 if (tracename != 0) { 312 strlcpy(inittracename, tracename, sizeof(inittracename)); 313 set_tracefile(inittracename, "%s", -1); 314 } else { 315 tracelevel_msg("%s", -1); /* turn on tracing to stdio */ 316 } 317 318 bufinit(); 319 320 /* initialize radix tree */ 321 rtinit(); 322 323 /* Pick a random part of the second for our output to minimize 324 * collisions. 325 * 326 * Start broadcasting after hearing from other routers, and 327 * at a random time so a bunch of systems do not get synchronized 328 * after a power failure. 329 */ 330 intvl_random(&next_bcast, EPOCH+MIN_WAITTIME, EPOCH+SUPPLY_INTERVAL); 331 age_timer.tv_usec = next_bcast.tv_usec; 332 age_timer.tv_sec = EPOCH+MIN_WAITTIME; 333 rdisc_timer = next_bcast; 334 ifinit_timer.tv_usec = next_bcast.tv_usec; 335 336 /* Collect an initial view of the world by checking the interface 337 * configuration and the kludge file. 338 */ 339 gwkludge(); 340 ifinit(); 341 342 /* Ask for routes */ 343 rip_query(); 344 rdisc_sol(); 345 346 /* Now turn off stdio if not tracing */ 347 if (new_tracelevel == 0) 348 trace_close(background); 349 350 /* Loop forever, listening and broadcasting. 351 */ 352 for (;;) { 353 prev_clk = clk; 354 gettimeofday(&clk, 0); 355 if (prev_clk.tv_sec == clk.tv_sec 356 && prev_clk.tv_usec == clk.tv_usec+usec_fudge) { 357 /* Much of `routed` depends on time always advancing. 358 * On systems that do not guarantee that gettimeofday() 359 * produces unique timestamps even if called within 360 * a single tick, use trickery like that in classic 361 * BSD kernels. 362 */ 363 clk.tv_usec += ++usec_fudge; 364 365 } else { 366 usec_fudge = 0; 367 368 timevalsub(&t2, &clk, &prev_clk); 369 if (t2.tv_sec < 0 370 || t2.tv_sec > wtime.tv_sec + 5) { 371 /* Deal with time changes before other 372 * housekeeping to keep everything straight. 373 */ 374 dt = t2.tv_sec; 375 if (dt > 0) 376 dt -= wtime.tv_sec; 377 trace_act("time changed by %d sec", (int)dt); 378 epoch.tv_sec += dt; 379 } 380 } 381 timevalsub(&now, &clk, &epoch); 382 now_stale = now.tv_sec - STALE_TIME; 383 now_expire = now.tv_sec - EXPIRE_TIME; 384 now_garbage = now.tv_sec - GARBAGE_TIME; 385 386 /* deal with signals that should affect tracing */ 387 set_tracelevel(); 388 389 if (stopint != 0) { 390 rip_bcast(0); 391 rdisc_adv(); 392 trace_off("exiting with signal %d", stopint); 393 exit(stopint | 128); 394 } 395 396 /* look for new or dead interfaces */ 397 timevalsub(&wtime, &ifinit_timer, &now); 398 if (wtime.tv_sec <= 0) { 399 wtime.tv_sec = 0; 400 ifinit(); 401 rip_query(); 402 continue; 403 } 404 405 /* Check the kernel table occasionally for mysteriously 406 * evaporated routes 407 */ 408 timevalsub(&t2, &flush_kern_timer, &now); 409 if (t2.tv_sec <= 0) { 410 flush_kern(); 411 flush_kern_timer.tv_sec = (now.tv_sec 412 + CHECK_QUIET_INTERVAL); 413 continue; 414 } 415 if (timercmp(&t2, &wtime, <)) 416 wtime = t2; 417 418 /* If it is time, then broadcast our routes. 419 */ 420 if (supplier || advertise_mhome) { 421 timevalsub(&t2, &next_bcast, &now); 422 if (t2.tv_sec <= 0) { 423 /* Synchronize the aging and broadcast 424 * timers to minimize awakenings 425 */ 426 age(0); 427 428 rip_bcast(0); 429 430 /* It is desirable to send routing updates 431 * regularly. So schedule the next update 432 * 30 seconds after the previous one was 433 * scheduled, instead of 30 seconds after 434 * the previous update was finished. 435 * Even if we just started after discovering 436 * a 2nd interface or were otherwise delayed, 437 * pick a 30-second aniversary of the 438 * original broadcast time. 439 */ 440 n = 1 + (0-t2.tv_sec)/SUPPLY_INTERVAL; 441 next_bcast.tv_sec += n*SUPPLY_INTERVAL; 442 443 continue; 444 } 445 446 if (timercmp(&t2, &wtime, <)) 447 wtime = t2; 448 } 449 450 /* If we need a flash update, either do it now or 451 * set the delay to end when it is time. 452 * 453 * If we are within MIN_WAITTIME seconds of a full update, 454 * do not bother. 455 */ 456 if (need_flash 457 && supplier 458 && no_flash.tv_sec+MIN_WAITTIME < next_bcast.tv_sec) { 459 /* accurate to the millisecond */ 460 if (!timercmp(&no_flash, &now, >)) 461 rip_bcast(1); 462 timevalsub(&t2, &no_flash, &now); 463 if (timercmp(&t2, &wtime, <)) 464 wtime = t2; 465 } 466 467 /* trigger the main aging timer. 468 */ 469 timevalsub(&t2, &age_timer, &now); 470 if (t2.tv_sec <= 0) { 471 age(0); 472 continue; 473 } 474 if (timercmp(&t2, &wtime, <)) 475 wtime = t2; 476 477 /* update the kernel routing table 478 */ 479 timevalsub(&t2, &need_kern, &now); 480 if (t2.tv_sec <= 0) { 481 age(0); 482 continue; 483 } 484 if (timercmp(&t2, &wtime, <)) 485 wtime = t2; 486 487 /* take care of router discovery, 488 * but do it in the correct the millisecond 489 */ 490 if (!timercmp(&rdisc_timer, &now, >)) { 491 rdisc_age(0); 492 continue; 493 } 494 timevalsub(&t2, &rdisc_timer, &now); 495 if (timercmp(&t2, &wtime, <)) 496 wtime = t2; 497 498 499 /* wait for input or a timer to expire. 500 */ 501 trace_flush(); 502 if (ibitsp) 503 free(ibitsp); 504 ibitsp = (fd_set *)calloc(howmany(sock_max, NFDBITS), 505 sizeof(fd_mask)); 506 if (ibitsp == NULL) 507 BADERR(1, "calloc"); 508 memcpy(ibitsp, fdbitsp, howmany(sock_max, NFDBITS) * 509 sizeof(fd_mask)); 510 n = select(sock_max, ibitsp, 0, 0, &wtime); 511 if (n <= 0) { 512 if (n < 0 && errno != EINTR && errno != EAGAIN) 513 BADERR(1,"select"); 514 continue; 515 } 516 517 if (FD_ISSET(rt_sock, ibitsp)) { 518 read_rt(); 519 n--; 520 } 521 if (rdisc_sock >= 0 && FD_ISSET(rdisc_sock, ibitsp)) { 522 read_d(); 523 n--; 524 } 525 if (rip_sock >= 0 && FD_ISSET(rip_sock, ibitsp)) { 526 read_rip(rip_sock, 0); 527 n--; 528 } 529 530 for (ifp = ifnet; n > 0 && 0 != ifp; ifp = ifp->int_next) { 531 if (ifp->int_rip_sock >= 0 532 && FD_ISSET(ifp->int_rip_sock, ibitsp)) { 533 read_rip(ifp->int_rip_sock, ifp); 534 n--; 535 } 536 } 537 } 538 } 539 540 541 /* ARGSUSED */ 542 void 543 sigalrm(int s UNUSED) 544 { 545 /* Historically, SIGALRM would cause the daemon to check for 546 * new and broken interfaces. 547 */ 548 ifinit_timer.tv_sec = now.tv_sec; 549 trace_act("SIGALRM"); 550 } 551 552 553 /* watch for fatal signals */ 554 void 555 sigterm(int sig) 556 { 557 stopint = sig; 558 (void)signal(sig, SIG_DFL); /* catch it only once */ 559 } 560 561 562 void 563 fix_select(void) 564 { 565 struct interface *ifp; 566 567 sock_max = 0; 568 569 if (sock_max <= rt_sock) 570 sock_max = rt_sock + 1; 571 if (rip_sock >= 0) 572 if (sock_max <= rip_sock) 573 sock_max = rip_sock + 1; 574 for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) { 575 if (ifp->int_rip_sock >= 0) 576 if (sock_max <= ifp->int_rip_sock) 577 sock_max = ifp->int_rip_sock + 1; 578 } 579 if (rdisc_sock >= 0) 580 if (sock_max <= rdisc_sock) 581 sock_max = rdisc_sock + 1; 582 583 if (fdbitsp) 584 free(fdbitsp); 585 fdbitsp = (fd_set *)calloc(howmany(sock_max, NFDBITS), 586 sizeof(fd_mask)); 587 if (fdbitsp == NULL) 588 BADERR(1, "calloc"); 589 590 FD_SET(rt_sock, fdbitsp); 591 if (rip_sock >= 0) 592 FD_SET(rip_sock, fdbitsp); 593 for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) { 594 if (ifp->int_rip_sock >= 0) 595 FD_SET(ifp->int_rip_sock, fdbitsp); 596 } 597 if (rdisc_sock >= 0) 598 FD_SET(rdisc_sock, fdbitsp); 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 return -1; 671 } 672 fix_sock(s,"rip_sock"); 673 674 ttl = 1; 675 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, 676 &ttl, sizeof(ttl)) < 0) 677 DBGERR(1,"rip_sock setsockopt(IP_MULTICAST_TTL)"); 678 679 return s; 680 } 681 682 683 /* turn off main RIP socket */ 684 void 685 rip_off(void) 686 { 687 struct interface *ifp; 688 naddr addr; 689 690 691 if (rip_sock >= 0 && !mhome) { 692 trace_act("turn off RIP"); 693 694 (void)close(rip_sock); 695 rip_sock = -1; 696 697 /* get non-broadcast sockets to listen to queries. 698 */ 699 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 700 if (ifp->int_state & IS_REMOTE) 701 continue; 702 if (ifp->int_rip_sock < 0) { 703 addr = ((ifp->int_if_flags & IFF_POINTOPOINT) 704 ? ifp->int_dstaddr 705 : ifp->int_addr); 706 ifp->int_rip_sock = get_rip_sock(addr, 0); 707 } 708 } 709 710 fix_select(); 711 712 age(0); 713 } 714 } 715 716 717 /* turn on RIP multicast input via an interface 718 */ 719 static void 720 rip_mcast_on(struct interface *ifp) 721 { 722 struct ip_mreq m; 723 724 if (!IS_RIP_IN_OFF(ifp->int_state) 725 && (ifp->int_if_flags & IFF_MULTICAST) 726 #ifdef MCAST_PPP_BUG 727 && !(ifp->int_if_flags & IFF_POINTOPOINT) 728 #endif 729 && !(ifp->int_state & IS_ALIAS)) { 730 m.imr_multiaddr.s_addr = htonl(INADDR_RIP_GROUP); 731 #ifdef MCAST_IFINDEX 732 m.imr_interface.s_addr = htonl(ifp->int_index); 733 #else 734 m.imr_interface.s_addr = ((ifp->int_if_flags & IFF_POINTOPOINT) 735 ? ifp->int_dstaddr 736 : ifp->int_addr); 737 #endif 738 if (setsockopt(rip_sock,IPPROTO_IP, IP_ADD_MEMBERSHIP, 739 &m, sizeof(m)) < 0) 740 LOGERR("setsockopt(IP_ADD_MEMBERSHIP RIP)"); 741 } 742 } 743 744 745 /* Prepare socket used for RIP. 746 */ 747 void 748 rip_on(struct interface *ifp) 749 { 750 /* If the main RIP socket is already alive, only start receiving 751 * multicasts for this interface. 752 */ 753 if (rip_sock >= 0) { 754 if (ifp != 0) 755 rip_mcast_on(ifp); 756 return; 757 } 758 759 /* If the main RIP socket is off and it makes sense to turn it on, 760 * then turn it on for all of the interfaces. 761 * It makes sense if either router discovery is off, or if 762 * router discover is on and at most one interface is doing RIP. 763 */ 764 if (rip_interfaces > 0 && (!rdisc_ok || rip_interfaces > 1)) { 765 trace_act("turn on RIP"); 766 767 /* Close all of the query sockets so that we can open 768 * the main socket. SO_REUSEPORT is not a solution, 769 * since that would let two daemons bind to the broadcast 770 * socket. 771 */ 772 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 773 if (ifp->int_rip_sock >= 0) { 774 (void)close(ifp->int_rip_sock); 775 ifp->int_rip_sock = -1; 776 } 777 } 778 779 rip_sock = get_rip_sock(INADDR_ANY, 1); 780 rip_sock_mcast = 0; 781 782 /* Do not advertise anything until we have heard something 783 */ 784 if (next_bcast.tv_sec < now.tv_sec+MIN_WAITTIME) 785 next_bcast.tv_sec = now.tv_sec+MIN_WAITTIME; 786 787 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) { 788 ifp->int_query_time = NEVER; 789 rip_mcast_on(ifp); 790 } 791 ifinit_timer.tv_sec = now.tv_sec; 792 793 } else if (ifp != 0 794 && !(ifp->int_state & IS_REMOTE) 795 && ifp->int_rip_sock < 0) { 796 /* RIP is off, so ensure there are sockets on which 797 * to listen for queries. 798 */ 799 ifp->int_rip_sock = get_rip_sock(ifp->int_addr, 0); 800 } 801 802 fix_select(); 803 } 804 805 806 /* die if malloc(3) fails 807 */ 808 void * 809 rtmalloc(size_t size, 810 const char *msg) 811 { 812 void *p = malloc(size); 813 if (p == 0) 814 logbad(1,"malloc(%lu) failed in %s", (u_long)size, msg); 815 return p; 816 } 817 818 819 /* get a random instant in an interval 820 */ 821 void 822 intvl_random(struct timeval *tp, /* put value here */ 823 u_long lo, /* value is after this second */ 824 u_long hi) /* and before this */ 825 { 826 tp->tv_sec = (time_t)(hi == lo 827 ? lo 828 : (lo + arc4random() % ((hi - lo)))); 829 tp->tv_usec = arc4random() % 1000000; 830 } 831 832 833 void 834 timevaladd(struct timeval *t1, 835 struct timeval *t2) 836 { 837 838 t1->tv_sec += t2->tv_sec; 839 if ((t1->tv_usec += t2->tv_usec) >= 1000000) { 840 t1->tv_sec++; 841 t1->tv_usec -= 1000000; 842 } 843 } 844 845 846 /* t1 = t2 - t3 847 */ 848 static void 849 timevalsub(struct timeval *t1, 850 struct timeval *t2, 851 struct timeval *t3) 852 { 853 t1->tv_sec = t2->tv_sec - t3->tv_sec; 854 if ((t1->tv_usec = t2->tv_usec - t3->tv_usec) < 0) { 855 t1->tv_sec--; 856 t1->tv_usec += 1000000; 857 } 858 } 859 860 861 /* put a message into the system log 862 */ 863 void 864 msglog(const char *p, ...) 865 { 866 va_list args; 867 868 trace_flush(); 869 870 va_start(args, p); 871 vsyslog(LOG_ERR, p, args); 872 va_end(args); 873 874 if (ftrace != 0) { 875 if (ftrace == stdout) 876 (void)fputs("routed: ", ftrace); 877 va_start(args, p); 878 (void)vfprintf(ftrace, p, args); 879 va_end(args); 880 (void)fputc('\n', ftrace); 881 } 882 } 883 884 885 /* Put a message about a bad system into the system log if 886 * we have not complained about it recently. 887 * 888 * It is desirable to complain about all bad systems, but not too often. 889 * In the worst case, it is not practical to keep track of all bad systems. 890 * For example, there can be many systems with the wrong password. 891 */ 892 void 893 msglim(struct msg_limit *lim, naddr addr, const char *p, ...) 894 { 895 va_list args; 896 int i; 897 struct msg_sub *ms1, *ms; 898 const char *p1; 899 900 /* look for the oldest slot in the table 901 * or the slot for the bad router. 902 */ 903 ms = ms1 = lim->subs; 904 for (i = MSG_SUBJECT_N; ; i--, ms1++) { 905 if (i == 0) { 906 /* Reuse a slot at most once every 10 minutes. 907 */ 908 if (lim->reuse > now.tv_sec) { 909 ms = 0; 910 } else { 911 ms = ms1; 912 lim->reuse = now.tv_sec + 10*60; 913 } 914 break; 915 } 916 if (ms->addr == addr) { 917 /* Repeat a complaint about a given system at 918 * most once an hour. 919 */ 920 if (ms->until > now.tv_sec) 921 ms = 0; 922 break; 923 } 924 if (ms->until < ms1->until) 925 ms = ms1; 926 } 927 if (ms != 0) { 928 ms->addr = addr; 929 ms->until = now.tv_sec + 60*60; /* 60 minutes */ 930 931 trace_flush(); 932 for (p1 = p; *p1 == ' '; p1++) 933 continue; 934 va_start(args, p); 935 vsyslog(LOG_ERR, p1, args); 936 va_end(args); 937 } 938 939 /* always display the message if tracing */ 940 if (ftrace != 0) { 941 va_start(args, p); 942 (void)vfprintf(ftrace, p, args); 943 (void)fputc('\n', ftrace); 944 va_end(args); 945 } 946 } 947 948 949 void 950 logbad(int dump, const char *p, ...) 951 { 952 va_list args; 953 954 trace_flush(); 955 956 va_start(args, p); 957 vsyslog(LOG_ERR, p, args); 958 va_end(args); 959 960 (void)fputs("routed: ", stderr); 961 va_start(args, p); 962 (void)vfprintf(stderr, p, args); 963 va_end(args); 964 (void)fputs("; giving up\n",stderr); 965 (void)fflush(stderr); 966 967 if (dump) 968 abort(); 969 exit(1); 970 } 971
Indexes created Sat Sep 20 22:09:52 GMT 2025