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