1 /* 2 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 * 5 * Copyright (c) 1983, 1988, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgment: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * $FreeBSD: src/sbin/routed/main.c,v 1.14 2000/08/11 08:24:38 sheldonh Exp $ 37 * char copyright[] = "@(#) Copyright (c) 1983, 1988, 1993\n" 38 * " The Regents of the University of California. All rights reserved.\n"; 39 */ 40 41 #pragma ident "%Z%%M% %I% %E% SMI" 42 43 #include "defs.h" 44 #include "pathnames.h" 45 #include <signal.h> 46 #include <fcntl.h> 47 #include <sys/file.h> 48 #include <userdefs.h> 49 #include <sys/stat.h> 50 51 #define IN_ROUTED_VERSION "2.22" 52 53 int stopint; 54 boolean_t supplier; /* supply or broadcast updates */ 55 boolean_t supplier_set; 56 /* -S option. _B_TRUE=treat all RIP speakers as default routers. */ 57 boolean_t save_space = _B_FALSE; 58 59 static boolean_t default_gateway; /* _B_TRUE=advertise default */ 60 static boolean_t background = _B_TRUE; 61 boolean_t ridhosts; /* _B_TRUE=reduce host routes */ 62 boolean_t mhome; /* _B_TRUE=want multi-homed host route */ 63 boolean_t advertise_mhome; /* _B_TRUE=must continue advertising it */ 64 boolean_t auth_ok = _B_TRUE; /* _B_TRUE=ignore auth if we don't care */ 65 boolean_t no_install; /* _B_TRUE=don't install in kernel */ 66 67 struct timeval epoch; /* when started */ 68 struct timeval clk; 69 static struct timeval prev_clk; 70 static int usec_fudge; 71 struct timeval now; /* current idea of time */ 72 /* If a route's rts_time is <= to now_stale, the route is stale. */ 73 time_t now_stale; 74 /* If a route's rts_time is <= to now_expire, the route is expired */ 75 time_t now_expire; 76 /* If a route's rts_time is <= to now_garbage, the route needs to be deleted */ 77 time_t now_garbage; 78 79 static struct timeval next_bcast; /* next general broadcast */ 80 struct timeval no_flash = { /* inhibit flash update */ 81 EPOCH+SUPPLY_INTERVAL, 0 82 }; 83 84 /* When now reaches this time, it's time to call sync_kern() */ 85 static struct timeval sync_kern_timer; 86 87 static fd_set fdbits; 88 static int sock_max; 89 int rip_sock = -1; /* RIP socket */ 90 boolean_t rip_enabled; 91 static boolean_t openlog_done; 92 93 /* 94 * The interface to which rip_sock is currently pointing for 95 * output. 96 */ 97 struct interface *rip_sock_interface; 98 99 int rt_sock; /* routing socket */ 100 101 102 static int open_rip_sock(); 103 static void timevalsub(struct timeval *, struct timeval *, struct timeval *); 104 static void sigalrm(int); 105 static void sigterm(int); 106 107 static int 108 daemon(boolean_t nochdir, boolean_t noclose) 109 { 110 int retv; 111 112 if ((retv = fork()) == -1) 113 return (-1); 114 if (retv != 0) 115 _exit(EXIT_SUCCESS); 116 if (setsid() == -1) 117 return (-1); 118 if ((retv = fork()) == -1) 119 return (-1); 120 if (retv != 0) 121 _exit(EXIT_SUCCESS); 122 if (!nochdir && chdir("/") == -1) 123 return (-1); 124 if (!noclose) { 125 (void) close(0); 126 (void) close(1); 127 (void) close(2); 128 if ((retv = open("/dev/null", O_RDWR)) != -1) { 129 (void) dup2(retv, 1); 130 (void) dup2(retv, 2); 131 } 132 } 133 return (0); 134 } 135 136 int 137 main(int argc, char *argv[]) 138 { 139 int n, off; 140 char *p, *q; 141 const char *cp; 142 struct timeval select_timeout, result; 143 fd_set ibits; 144 in_addr_t p_net, p_mask; 145 struct parm parm; 146 char *tracename = NULL; 147 boolean_t vflag = _B_FALSE; 148 boolean_t version = _B_FALSE; 149 int sigerr = 0; 150 FILE *pidfp; 151 mode_t pidmode = (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); /* 0644 */ 152 153 (void) setlocale(LC_ALL, ""); 154 155 #if !defined(TEXT_DOMAIN) /* Should be defined by cc -D */ 156 #define TEXT_DOMAIN "SYS_TEXT" 157 #endif /* ! TEXT_DOMAIN */ 158 159 (void) textdomain(TEXT_DOMAIN); 160 161 /* 162 * Some shells are badly broken and send SIGHUP to backgrounded 163 * processes. 164 */ 165 if (signal(SIGHUP, SIG_IGN) == SIG_ERR) 166 sigerr = errno; 167 168 ftrace = stdout; 169 170 if (gettimeofday(&clk, 0) == -1) { 171 logbad(_B_FALSE, "gettimeofday: %s", rip_strerror(errno)); 172 } 173 prev_clk = clk; 174 epoch = clk; 175 epoch.tv_sec -= EPOCH; 176 now.tv_sec = EPOCH; 177 now_stale = EPOCH - STALE_TIME; 178 now_expire = EPOCH - EXPIRE_TIME; 179 now_garbage = EPOCH - GARBAGE_TIME; 180 select_timeout.tv_sec = 0; 181 182 while ((n = getopt(argc, argv, "sSqdghmpAztVvnT:F:P:")) != -1) { 183 switch (n) { 184 case 'A': 185 /* 186 * Ignore authentication if we do not care. 187 * Crazy as it is, that is what RFC 2453 requires. 188 */ 189 auth_ok = _B_FALSE; 190 break; 191 192 case 't': 193 if (new_tracelevel < 2) 194 new_tracelevel = 2; 195 background = _B_FALSE; 196 break; 197 198 case 'd': /* put in.routed in foreground */ 199 background = _B_FALSE; 200 break; 201 202 case 'F': /* minimal routes for SLIP */ 203 n = FAKE_METRIC; 204 p = strchr(optarg, ','); 205 if (p != NULL) { 206 n = (int)strtoul(p+1, &q, 0); 207 if (*q == '\0' && p+1 != q && 208 n <= HOPCNT_INFINITY-1 && n >= 1) 209 *p = '\0'; 210 } 211 if (!getnet(optarg, &p_net, &p_mask)) { 212 if (p != NULL) 213 *p = ','; 214 msglog(gettext("bad network; \"-F %s\""), 215 optarg); 216 break; 217 } 218 (void) memset(&parm, 0, sizeof (parm)); 219 parm.parm_net = p_net; 220 parm.parm_mask = p_mask; 221 parm.parm_d_metric = n; 222 cp = insert_parm(&parm); 223 if (cp != NULL) 224 msglog(gettext("bad -F: %s"), cp); 225 break; 226 227 case 'g': 228 (void) memset(&parm, 0, sizeof (parm)); 229 parm.parm_d_metric = 1; 230 cp = insert_parm(&parm); 231 if (cp != NULL) 232 msglog(gettext("bad -g: %s"), cp); 233 else 234 default_gateway = _B_TRUE; 235 break; 236 237 case 'h': /* suppress extra host routes */ 238 ridhosts = _B_TRUE; 239 break; 240 241 case 'm': /* advertise host route */ 242 mhome = _B_TRUE; /* on multi-homed hosts */ 243 break; 244 245 case 'n': /* No-install mode */ 246 no_install = _B_TRUE; 247 break; 248 249 case 'P': 250 /* handle arbitrary parameters. */ 251 q = strdup(optarg); 252 if (q == NULL) 253 logbad(_B_FALSE, "strdup: %s", 254 rip_strerror(errno)); 255 cp = parse_parms(q, _B_FALSE); 256 if (cp != NULL) 257 msglog(gettext("%1$s in \"-P %2$s\""), cp, 258 optarg); 259 free(q); 260 break; 261 262 case 'q': 263 supplier = _B_FALSE; 264 supplier_set = _B_TRUE; 265 break; 266 267 case 's': 268 supplier = _B_TRUE; 269 supplier_set = _B_TRUE; 270 break; 271 272 case 'S': /* save-space option */ 273 save_space = _B_TRUE; 274 break; 275 276 case 'T': 277 tracename = optarg; 278 break; 279 280 case 'V': 281 /* display version */ 282 version = _B_TRUE; 283 msglog(gettext("version " IN_ROUTED_VERSION)); 284 break; 285 286 case 'v': 287 /* display route changes to supplied logfile */ 288 new_tracelevel = 1; 289 vflag = _B_TRUE; 290 break; 291 292 case 'z': /* increase debug-level */ 293 new_tracelevel++; 294 break; 295 296 default: 297 goto usage; 298 } 299 } 300 argc -= optind; 301 argv += optind; 302 303 if (tracename == NULL && argc >= 1) { 304 tracename = *argv++; 305 argc--; 306 } 307 if (tracename != NULL && tracename[0] == '\0') 308 goto usage; 309 if (vflag && tracename == NULL) 310 goto usage; 311 if (argc != 0) { 312 usage: 313 (void) fprintf(stderr, 314 gettext("usage: in.routed [-AdghmnqsStVvz] " 315 "[-T <tracefile>]\n")); 316 (void) fprintf(stderr, 317 gettext("\t[-F <net>[/<mask>][,<metric>]] [-P <parms>]\n")); 318 logbad(_B_FALSE, gettext("excess arguments")); 319 } 320 if (geteuid() != 0) { 321 /* 322 * Regular users are allowed to run in.routed for the 323 * sole purpose of obtaining the version number. In 324 * that case, exit(EXIT_SUCCESS) without complaining. 325 */ 326 if (version) 327 exit(EXIT_SUCCESS); 328 logbad(_B_FALSE, gettext("requires UID 0")); 329 } 330 331 if (default_gateway) { 332 if (supplier_set && !supplier) { 333 msglog(gettext("-g and -q are incompatible")); 334 } else { 335 supplier = _B_TRUE; 336 supplier_set = _B_TRUE; 337 } 338 } 339 340 if (signal(SIGALRM, sigalrm) == SIG_ERR) 341 sigerr = errno; 342 /* SIGHUP fatal during debugging */ 343 if (!background) 344 if (signal(SIGHUP, sigterm) == SIG_ERR) 345 sigerr = errno; 346 if (signal(SIGTERM, sigterm) == SIG_ERR) 347 sigerr = errno; 348 if (signal(SIGINT, sigterm) == SIG_ERR) 349 sigerr = errno; 350 if (signal(SIGUSR1, sigtrace_more) == SIG_ERR) 351 sigerr = errno; 352 if (signal(SIGUSR2, sigtrace_less) == SIG_ERR) 353 sigerr = errno; 354 if (signal(SIGHUP, sigtrace_dump) == SIG_ERR) 355 sigerr = errno; 356 357 if (sigerr) 358 msglog("signal: %s", rip_strerror(sigerr)); 359 360 /* get into the background */ 361 if (background && daemon(_B_FALSE, _B_FALSE) < 0) 362 BADERR(_B_FALSE, "daemon()"); 363 364 /* Store our process id, blow away any existing file if it exists. */ 365 if ((pidfp = fopen(PATH_PID, "w")) == NULL) { 366 (void) fprintf(stderr, 367 gettext("in.routed: unable to open " PATH_PID ": %s\n"), 368 strerror(errno)); 369 } else { 370 (void) fprintf(pidfp, "%ld\n", getpid()); 371 (void) fclose(pidfp); 372 (void) chmod(PATH_PID, pidmode); 373 } 374 375 srandom((int)(clk.tv_sec ^ clk.tv_usec ^ getpid())); 376 377 /* allocate the interface tables */ 378 iftbl_alloc(); 379 380 /* prepare socket connected to the kernel. */ 381 rt_sock = socket(PF_ROUTE, SOCK_RAW, AF_INET); 382 if (rt_sock < 0) 383 BADERR(_B_TRUE, "rt_sock = socket()"); 384 if (fcntl(rt_sock, F_SETFL, O_NONBLOCK) == -1) 385 logbad(_B_TRUE, "fcntl(rt_sock) O_NONBLOCK: %s", 386 rip_strerror(errno)); 387 off = 0; 388 if (setsockopt(rt_sock, SOL_SOCKET, SO_USELOOPBACK, 389 &off, sizeof (off)) < 0) 390 LOGERR("setsockopt(SO_USELOOPBACK,0)"); 391 392 fix_select(); 393 394 395 if (tracename != NULL) { 396 (void) strlcpy(inittracename, tracename, 397 sizeof (inittracename)); 398 set_tracefile(inittracename, "%s", -1); 399 } else { 400 tracelevel_msg("%s", -1); /* turn on tracing to stdio */ 401 } 402 403 bufinit(); 404 405 /* initialize radix tree */ 406 rtinit(); 407 408 /* 409 * Pick a random part of the second for our output to minimize 410 * collisions. 411 * 412 * Start broadcasting after hearing from other routers, and 413 * at a random time so a bunch of systems do not get synchronized 414 * after a power failure. 415 * 416 * Since now is the number of seconds since epoch (this is initially 417 * EPOCH seconds), these times are really relative to now. 418 */ 419 intvl_random(&next_bcast, EPOCH+MIN_WAITTIME, EPOCH+SUPPLY_INTERVAL); 420 age_timer.tv_usec = next_bcast.tv_usec; 421 age_timer.tv_sec = EPOCH+MIN_WAITTIME; 422 rdisc_timer = next_bcast; 423 ifscan_timer.tv_usec = next_bcast.tv_usec; 424 425 /* 426 * Open the global rip socket. From now on, this socket can be 427 * assumed to be open. It will remain open until in.routed 428 * exits. 429 */ 430 rip_sock = open_rip_sock(); 431 432 /* 433 * Collect an initial view of the world by checking the interface 434 * configuration and the kludge file. 435 * 436 * gwkludge() could call addroutefordefault(), resulting in a call to 437 * iflookup, and thus ifscan() to find the physical interfaces. 438 * ifscan() will attempt to use the rip_sock in order to join 439 * mcast groups, so gwkludge *must* be called after opening 440 * the rip_sock. 441 */ 442 gwkludge(); 443 444 ifscan(); 445 446 /* Ask for routes */ 447 rip_query(); 448 rdisc_sol(); 449 450 /* Now turn off stdio if not tracing */ 451 if (new_tracelevel == 0) 452 trace_close(background); 453 454 /* Loop until a fatal error occurs, listening and broadcasting. */ 455 for (;;) { 456 prev_clk = clk; 457 if (gettimeofday(&clk, 0) == -1) { 458 logbad(_B_FALSE, "gettimeofday: %s", 459 rip_strerror(errno)); 460 } 461 if (prev_clk.tv_sec == clk.tv_sec && 462 prev_clk.tv_usec == clk.tv_usec+usec_fudge) { 463 /* 464 * Much of `in.routed` depends on time always advancing. 465 * On systems that do not guarantee that gettimeofday() 466 * produces unique timestamps even if called within 467 * a single tick, use trickery like that in classic 468 * BSD kernels. 469 */ 470 clk.tv_usec += ++usec_fudge; 471 472 } else { 473 time_t dt; 474 475 usec_fudge = 0; 476 477 timevalsub(&result, &clk, &prev_clk); 478 if (result.tv_sec < 0 || result.tv_sec > 479 select_timeout.tv_sec + 5) { 480 /* 481 * Deal with time changes before other 482 * housekeeping to keep everything straight. 483 */ 484 dt = result.tv_sec; 485 if (dt > 0) 486 dt -= select_timeout.tv_sec; 487 trace_act("time changed by %d sec", (int)dt); 488 epoch.tv_sec += dt; 489 } 490 } 491 timevalsub(&now, &clk, &epoch); 492 now_stale = now.tv_sec - STALE_TIME; 493 now_expire = now.tv_sec - EXPIRE_TIME; 494 now_garbage = now.tv_sec - GARBAGE_TIME; 495 496 /* deal with signals that should affect tracing */ 497 set_tracelevel(); 498 499 if (stopint != 0) { 500 trace_off("exiting with signal %d", stopint); 501 break; 502 } 503 504 /* look for new or dead interfaces */ 505 timevalsub(&select_timeout, &ifscan_timer, &now); 506 if (select_timeout.tv_sec <= 0) { 507 select_timeout.tv_sec = 0; 508 ifscan(); 509 rip_query(); 510 continue; 511 } 512 513 /* 514 * Check the kernel table occassionally for mysteriously 515 * evaporated routes 516 */ 517 timevalsub(&result, &sync_kern_timer, &now); 518 if (result.tv_sec <= 0) { 519 sync_kern(); 520 sync_kern_timer.tv_sec = (now.tv_sec 521 + CHECK_QUIET_INTERVAL); 522 continue; 523 } 524 if (timercmp(&result, &select_timeout, < /* */)) 525 select_timeout = result; 526 527 /* If it is time, then broadcast our routes. */ 528 if (should_supply(NULL) || advertise_mhome) { 529 timevalsub(&result, &next_bcast, &now); 530 if (result.tv_sec <= 0) { 531 /* 532 * Synchronize the aging and broadcast 533 * timers to minimize awakenings 534 */ 535 age(0); 536 age_peer_info(); 537 538 rip_bcast(0); 539 540 /* 541 * It is desirable to send routing updates 542 * regularly. So schedule the next update 543 * 30 seconds after the previous one was 544 * scheduled, instead of 30 seconds after 545 * the previous update was finished. 546 * Even if we just started after discovering 547 * a 2nd interface or were otherwise delayed, 548 * pick a 30-second aniversary of the 549 * original broadcast time. 550 */ 551 n = 1 + (0-result.tv_sec)/SUPPLY_INTERVAL; 552 next_bcast.tv_sec += n*SUPPLY_INTERVAL; 553 554 continue; 555 } 556 557 if (timercmp(&result, &select_timeout, < /* */)) 558 select_timeout = result; 559 } 560 561 /* 562 * If we need a flash update, either do it now or 563 * set the delay to end when it is time. 564 * 565 * If we are within MIN_WAITTIME seconds of a full update, 566 * do not bother. 567 */ 568 if (need_flash && should_supply(NULL) && 569 no_flash.tv_sec+MIN_WAITTIME < next_bcast.tv_sec) { 570 /* accurate to the millisecond */ 571 if (!timercmp(&no_flash, &now, > /* */)) 572 rip_bcast(1); 573 timevalsub(&result, &no_flash, &now); 574 if (timercmp(&result, &select_timeout, < /* */)) 575 select_timeout = result; 576 } 577 578 /* trigger the main aging timer. */ 579 timevalsub(&result, &age_timer, &now); 580 if (result.tv_sec <= 0) { 581 age(0); 582 continue; 583 } 584 if (timercmp(&result, &select_timeout, < /* */)) 585 select_timeout = result; 586 587 /* update the kernel routing table */ 588 timevalsub(&result, &need_kern, &now); 589 if (result.tv_sec <= 0) { 590 age(0); 591 continue; 592 } 593 if (timercmp(&result, &select_timeout, < /* */)) 594 select_timeout = result; 595 596 /* 597 * take care of router discovery. We compare timeval 598 * structures here to have millisecond granularity. 599 */ 600 if (!timercmp(&rdisc_timer, &now, > /* */)) { 601 rdisc_age(0); 602 continue; 603 } 604 timevalsub(&result, &rdisc_timer, &now); 605 if (timercmp(&result, &select_timeout, < /* */)) 606 select_timeout = result; 607 608 /* 609 * Well-known bit of select(3c) silliness inherited 610 * from BSD: anything over 100 million seconds is 611 * considered an "error." Reset that to zero. 612 */ 613 if (select_timeout.tv_sec > 100000000) 614 select_timeout.tv_sec = 0; 615 616 /* wait for input or a timer to expire. */ 617 trace_flush(); 618 ibits = fdbits; 619 n = select(sock_max, &ibits, 0, 0, &select_timeout); 620 if (n <= 0) { 621 if (n < 0 && errno != EINTR && errno != EAGAIN) 622 BADERR(_B_TRUE, "select"); 623 continue; 624 } 625 626 if (FD_ISSET(rt_sock, &ibits)) { 627 read_rt(); 628 n--; 629 } 630 if (rdisc_sock >= 0 && FD_ISSET(rdisc_sock, &ibits)) { 631 read_d(); 632 n--; 633 } 634 if (rdisc_mib_sock >= 0 && FD_ISSET(rdisc_mib_sock, &ibits)) { 635 process_d_mib_sock(); 636 n--; 637 } 638 if (rip_sock >= 0 && FD_ISSET(rip_sock, &ibits)) { 639 if (read_rip() == -1) { 640 rip_enabled = _B_FALSE; 641 trace_off("main rip socket failed"); 642 (void) close(rip_sock); 643 rip_sock = -1; 644 fix_select(); 645 break; 646 } 647 n--; 648 } 649 } 650 rip_bcast(0); 651 rdisc_adv(_B_FALSE); 652 (void) unlink(PATH_PID); 653 return (stopint | 128); 654 } 655 656 657 static void 658 sigalrm(int sig) 659 { 660 /* 661 * Historically, SIGALRM would cause the daemon to check for 662 * new and broken interfaces. 663 */ 664 ifscan_timer.tv_sec = now.tv_sec; 665 trace_act("SIGALRM"); 666 if (signal(sig, sigalrm) == SIG_ERR) 667 msglog("signal: %s", rip_strerror(errno)); 668 } 669 670 671 /* watch for fatal signals */ 672 static void 673 sigterm(int sig) 674 { 675 stopint = sig; 676 if (signal(sig, SIG_DFL) == SIG_ERR) /* catch it only once */ 677 msglog("signal: %s", rip_strerror(errno)); 678 } 679 680 681 void 682 fix_select(void) 683 { 684 (void) FD_ZERO(&fdbits); 685 sock_max = 0; 686 687 FD_SET(rt_sock, &fdbits); 688 if (sock_max <= rt_sock) 689 sock_max = rt_sock+1; 690 if (rip_sock >= 0) { 691 FD_SET(rip_sock, &fdbits); 692 if (sock_max <= rip_sock) 693 sock_max = rip_sock+1; 694 } 695 if (rdisc_sock >= 0) { 696 FD_SET(rdisc_sock, &fdbits); 697 if (sock_max <= rdisc_sock) 698 sock_max = rdisc_sock+1; 699 FD_SET(rdisc_mib_sock, &fdbits); 700 if (sock_max <= rdisc_mib_sock) 701 sock_max = rdisc_mib_sock+1; 702 } 703 } 704 705 706 void 707 fix_sock(int sock, 708 const char *name) 709 { 710 int on; 711 #define MIN_SOCKBUF (4*1024) 712 static int rbuf; 713 714 if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1) 715 logbad(_B_TRUE, "fcntl(%s) O_NONBLOCK: %s", name, 716 rip_strerror(errno)); 717 on = 1; 718 if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) 719 msglog("setsockopt(%s,SO_BROADCAST): %s", 720 name, rip_strerror(errno)); 721 722 if (rbuf >= MIN_SOCKBUF) { 723 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, 724 &rbuf, sizeof (rbuf)) < 0) 725 msglog("setsockopt(%s,SO_RCVBUF=%d): %s", 726 name, rbuf, rip_strerror(errno)); 727 } else { 728 for (rbuf = 60*1024; ; rbuf -= 4096) { 729 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, 730 &rbuf, sizeof (rbuf)) == 0) { 731 trace_act("RCVBUF=%d", rbuf); 732 break; 733 } 734 if (rbuf < MIN_SOCKBUF) { 735 msglog("setsockopt(%s,SO_RCVBUF = %d): %s", 736 name, rbuf, rip_strerror(errno)); 737 break; 738 } 739 } 740 } 741 } 742 743 744 /* 745 * Open and return the global rip socket. It is guaranteed to return 746 * a good file descriptor. 747 */ 748 static int 749 open_rip_sock() 750 { 751 struct sockaddr_in sin; 752 unsigned char ttl; 753 int s; 754 int on = 1; 755 756 757 if ((s = socket(PF_INET, SOCK_DGRAM, 0)) < 0) 758 BADERR(_B_TRUE, "rip_sock = socket()"); 759 760 (void) memset(&sin, 0, sizeof (sin)); 761 sin.sin_family = AF_INET; 762 sin.sin_port = htons(RIP_PORT); 763 sin.sin_addr.s_addr = INADDR_ANY; 764 if (bind(s, (struct sockaddr *)&sin, sizeof (sin)) < 0) { 765 BADERR(_B_FALSE, "bind(rip_sock)"); 766 } 767 fix_sock(s, "rip_sock"); 768 769 ttl = 1; 770 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, 771 &ttl, sizeof (ttl)) < 0) 772 DBGERR(_B_TRUE, "rip_sock setsockopt(IP_MULTICAST_TTL)"); 773 774 if (setsockopt(s, IPPROTO_IP, IP_RECVIF, &on, sizeof (on))) 775 BADERR(_B_FALSE, "setsockopt(IP_RECVIF)"); 776 777 return (s); 778 } 779 780 781 /* 782 * Disable RIP. Note that we don't close the global rip socket since 783 * it is used even when RIP is disabled to receive and answer certain 784 * queries. 785 */ 786 void 787 rip_off(void) 788 { 789 struct ip_mreq m; 790 struct interface *ifp; 791 char addrstr[INET_ADDRSTRLEN]; 792 793 if (rip_enabled && !mhome) { 794 trace_act("turn off RIP"); 795 796 /* 797 * Unsubscribe from the 224.0.0.9 RIP multicast 798 * group address 799 */ 800 for (ifp = ifnet; ifp != NULL; ifp = ifp->int_next) { 801 if ((ifp->int_if_flags & IFF_MULTICAST) && 802 !IS_IFF_QUIET(ifp->int_if_flags) && 803 !IS_RIP_IN_OFF(ifp->int_state) && 804 !(ifp->int_state & IS_DUP)) { 805 m.imr_multiaddr.s_addr = 806 htonl(INADDR_RIP_GROUP); 807 m.imr_interface.s_addr = 808 (ifp->int_if_flags & IFF_POINTOPOINT) ? 809 ifp->int_dstaddr : ifp->int_addr; 810 (void) strlcpy(addrstr, 811 inet_ntoa(m.imr_multiaddr), 812 sizeof (addrstr)); 813 if (setsockopt(rip_sock, IPPROTO_IP, 814 IP_DROP_MEMBERSHIP, &m, 815 sizeof (m)) < 0 && 816 errno != EADDRNOTAVAIL && errno != ENOENT) 817 writelog(LOG_WARNING, 818 "%s: setsockopt(IP_DROP_MEMBERSHIP " 819 "%s, %s): %s", ifp->int_name, 820 addrstr, inet_ntoa(m.imr_interface), 821 rip_strerror(errno)); 822 } 823 } 824 rip_enabled = _B_FALSE; 825 826 age(0); 827 } 828 } 829 830 831 /* turn on RIP multicast input via an interface */ 832 void 833 rip_mcast_on(struct interface *ifp) 834 { 835 struct ip_mreq m; 836 837 if (!IS_RIP_IN_OFF(ifp->int_state) && 838 (ifp->int_if_flags & IFF_MULTICAST) && 839 !IS_IFF_QUIET(ifp->int_if_flags) && 840 !(ifp->int_state & IS_DUP)) { 841 m.imr_multiaddr.s_addr = htonl(INADDR_RIP_GROUP); 842 m.imr_interface.s_addr = (ifp->int_if_flags & IFF_POINTOPOINT) ? 843 ifp->int_dstaddr : ifp->int_addr; 844 if ((setsockopt(rip_sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, 845 &m, sizeof (m)) < 0) && !(ifp->int_state & IS_BROKE)) 846 writelog(LOG_WARNING, 847 "Could not join 224.0.0.9 on interface %s: %s", 848 ifp->int_name, rip_strerror(errno)); 849 } 850 } 851 852 /* turn off RIP multicast input via an interface */ 853 void 854 rip_mcast_off(struct interface *ifp) 855 { 856 struct ip_mreq m; 857 858 if ((ifp->int_if_flags & IFF_MULTICAST) && 859 !IS_IFF_QUIET(ifp->int_if_flags) && rip_enabled) { 860 m.imr_multiaddr.s_addr = htonl(INADDR_RIP_GROUP); 861 m.imr_interface.s_addr = (ifp->int_if_flags & IFF_POINTOPOINT) ? 862 ifp->int_dstaddr : ifp->int_addr; 863 if ((setsockopt(rip_sock, IPPROTO_IP, IP_DROP_MEMBERSHIP, 864 &m, sizeof (m)) < 0) && errno != EADDRNOTAVAIL && 865 errno != ENOENT) 866 writelog(LOG_WARNING, 867 "setsockopt(IP_DROP_MEMBERSHIP RIP) for %s: %s", 868 ifp->int_name, rip_strerror(errno)); 869 } 870 } 871 872 /* enable RIP */ 873 void 874 rip_on(struct interface *ifp) 875 { 876 /* 877 * If RIP is already enabled, only start receiving 878 * multicasts for this interface. 879 */ 880 if (rip_enabled) { 881 if (ifp != NULL) 882 rip_mcast_on(ifp); 883 return; 884 } 885 886 /* 887 * If RIP is disabled and it makes sense to enable it, then enable 888 * it on all of the interfaces. It makes sense if either router 889 * discovery is off, or if router discovery is on and at most one 890 * interface is doing RIP. 891 */ 892 if (rip_interfaces > 0 && (!rdisc_ok || rip_interfaces > 1)) { 893 trace_act("turn on RIP"); 894 895 rip_enabled = _B_TRUE; 896 rip_sock_interface = NULL; 897 898 /* Do not advertise anything until we have heard something */ 899 if (next_bcast.tv_sec < now.tv_sec+MIN_WAITTIME) 900 next_bcast.tv_sec = now.tv_sec+MIN_WAITTIME; 901 902 for (ifp = ifnet; ifp != NULL; ifp = ifp->int_next) { 903 ifp->int_query_time = NEVER; 904 rip_mcast_on(ifp); 905 } 906 ifscan_timer.tv_sec = now.tv_sec; 907 } 908 909 fix_select(); 910 } 911 912 913 /* die if malloc(3) fails */ 914 void * 915 rtmalloc(size_t size, 916 const char *msg) 917 { 918 void *p = malloc(size); 919 if (p == NULL) 920 logbad(_B_TRUE, "malloc(%lu) failed in %s: %s", (ulong_t)size, 921 msg, rip_strerror(errno)); 922 return (p); 923 } 924 925 926 /* get a random instant in an interval */ 927 void 928 intvl_random(struct timeval *tp, /* put value here */ 929 ulong_t lo, /* value is after this second */ 930 ulong_t hi) /* and before this */ 931 { 932 tp->tv_sec = (time_t)(hi == lo ? lo : (lo + random() % ((hi - lo)))); 933 tp->tv_usec = random() % 1000000; 934 } 935 936 937 void 938 timevaladd(struct timeval *t1, 939 struct timeval *t2) 940 { 941 942 t1->tv_sec += t2->tv_sec; 943 if ((t1->tv_usec += t2->tv_usec) >= 1000000) { 944 t1->tv_sec++; 945 t1->tv_usec -= 1000000; 946 } 947 } 948 949 950 /* t1 = t2 - t3 */ 951 static void 952 timevalsub(struct timeval *t1, 953 struct timeval *t2, 954 struct timeval *t3) 955 { 956 t1->tv_sec = t2->tv_sec - t3->tv_sec; 957 if ((t1->tv_usec = t2->tv_usec - t3->tv_usec) < 0) { 958 t1->tv_sec--; 959 t1->tv_usec += 1000000; 960 } 961 } 962 963 static void 964 do_openlog(void) 965 { 966 openlog_done = _B_TRUE; 967 openlog("in.routed", LOG_PID | LOG_ODELAY, LOG_DAEMON); 968 } 969 970 /* put a LOG_ERR message into the system log */ 971 void 972 msglog(const char *p, ...) 973 { 974 va_list args; 975 976 trace_flush(); 977 978 if (!openlog_done) 979 do_openlog(); 980 va_start(args, p); 981 vsyslog(LOG_ERR, p, args); 982 983 if (ftrace != 0) { 984 if (ftrace == stdout) 985 (void) fputs("in.routed: ", ftrace); 986 (void) vfprintf(ftrace, p, args); 987 (void) fputc('\n', ftrace); 988 } 989 } 990 991 992 /* 993 * Put a message about a bad system into the system log if 994 * we have not complained about it recently. 995 * 996 * It is desirable to complain about all bad systems, but not too often. 997 * In the worst case, it is not practical to keep track of all bad systems. 998 * For example, there can be many systems with the wrong password. 999 */ 1000 void 1001 msglim(struct msg_limit *lim, in_addr_t addr, const char *p, ...) 1002 { 1003 va_list args; 1004 int i; 1005 struct msg_sub *ms1, *ms; 1006 const char *p1; 1007 1008 va_start(args, p); 1009 1010 /* 1011 * look for the oldest slot in the table 1012 * or the slot for the bad router. 1013 */ 1014 ms = ms1 = lim->subs; 1015 for (i = MSG_SUBJECT_N; ; i--, ms1++) { 1016 if (i == 0) { 1017 /* Reuse a slot at most once every 10 minutes. */ 1018 if (lim->reuse > now.tv_sec) { 1019 ms = NULL; 1020 } else { 1021 lim->reuse = now.tv_sec + 10*60; 1022 } 1023 break; 1024 } 1025 if (ms->addr == addr) { 1026 /* 1027 * Repeat a complaint about a given system at 1028 * most once an hour. 1029 */ 1030 if (ms->until > now.tv_sec) 1031 ms = NULL; 1032 break; 1033 } 1034 if (ms->until < ms1->until) 1035 ms = ms1; 1036 } 1037 if (ms != NULL) { 1038 ms->addr = addr; 1039 ms->until = now.tv_sec + 60*60; /* 60 minutes */ 1040 1041 if (!openlog_done) 1042 do_openlog(); 1043 trace_flush(); 1044 for (p1 = p; *p1 == ' '; p1++) 1045 continue; 1046 vsyslog(LOG_ERR, p1, args); 1047 } 1048 1049 /* always display the message if tracing */ 1050 if (ftrace != 0) { 1051 (void) vfprintf(ftrace, p, args); 1052 (void) fputc('\n', ftrace); 1053 } 1054 } 1055 1056 1057 void 1058 logbad(boolean_t dump, const char *p, ...) 1059 { 1060 va_list args; 1061 1062 trace_flush(); 1063 1064 if (!openlog_done) 1065 do_openlog(); 1066 va_start(args, p); 1067 vsyslog(LOG_ERR, p, args); 1068 1069 (void) fputs(gettext("in.routed: "), stderr); 1070 (void) vfprintf(stderr, p, args); 1071 (void) fputs(gettext("; giving up\n"), stderr); 1072 (void) fflush(stderr); 1073 1074 if (dump) 1075 abort(); 1076 exit(EXIT_FAILURE); 1077 } 1078 1079 /* put a message into the system log */ 1080 void 1081 writelog(int level, const char *p, ...) 1082 { 1083 va_list args; 1084 1085 trace_flush(); 1086 1087 if (!openlog_done) 1088 do_openlog(); 1089 va_start(args, p); 1090 vsyslog(level, p, args); 1091 1092 if (ftrace != 0) { 1093 if (ftrace == stdout) 1094 (void) fputs("in.routed: ", ftrace); 1095 (void) vfprintf(ftrace, p, args); 1096 (void) fputc('\n', ftrace); 1097 } 1098 } 1099