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