1 /* $OpenBSD: ripe.c,v 1.9 2009/03/25 12:48:16 michele Exp $ */ 2 3 /* 4 * Copyright (c) 2006 Michele Marchetto <mydecay@openbeer.it> 5 * Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org> 6 * Copyright (c) 2004 Esben Norby <norby@openbsd.org> 7 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org> 8 * 9 * Permission to use, copy, modify, and distribute this software for any 10 * purpose with or without fee is hereby granted, provided that the above 11 * copyright notice and this permission notice appear in all copies. 12 * 13 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 14 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 15 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 16 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 17 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 18 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 19 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 20 */ 21 22 #include <sys/types.h> 23 #include <sys/socket.h> 24 #include <sys/queue.h> 25 #include <netinet/in.h> 26 #include <arpa/inet.h> 27 #include <net/if_types.h> 28 #include <stdlib.h> 29 #include <signal.h> 30 #include <string.h> 31 #include <fcntl.h> 32 #include <pwd.h> 33 #include <unistd.h> 34 #include <event.h> 35 #include <err.h> 36 #include <errno.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 40 #include "ripd.h" 41 #include "rip.h" 42 #include "ripe.h" 43 #include "log.h" 44 #include "control.h" 45 46 void ripe_sig_handler(int, short, void *); 47 void ripe_shutdown(void); 48 49 struct ripd_conf *oeconf = NULL; 50 struct imsgbuf *ibuf_main; 51 struct imsgbuf *ibuf_rde; 52 53 /* ARGSUSED */ 54 void 55 ripe_sig_handler(int sig, short event, void *bula) 56 { 57 switch (sig) { 58 case SIGINT: 59 case SIGTERM: 60 ripe_shutdown(); 61 /* NOTREACHED */ 62 default: 63 fatalx("unexpected signal"); 64 } 65 } 66 67 /* rip engine */ 68 pid_t 69 ripe(struct ripd_conf *xconf, int pipe_parent2ripe[2], int pipe_ripe2rde[2], 70 int pipe_parent2rde[2]) 71 { 72 struct event ev_sigint, ev_sigterm; 73 struct sockaddr_in addr; 74 struct iface *iface = NULL; 75 struct passwd *pw; 76 struct redistribute *r; 77 pid_t pid; 78 79 switch (pid = fork()) { 80 case -1: 81 fatal("cannot fork"); 82 case 0: 83 break; 84 default: 85 return (pid); 86 } 87 88 /* create ripd control socket outside chroot */ 89 if (control_init() == -1) 90 fatalx("control socket setup failed"); 91 92 addr.sin_family = AF_INET; 93 addr.sin_port = htons(RIP_PORT); 94 addr.sin_addr.s_addr = INADDR_ANY; 95 96 if ((xconf->rip_socket = socket(AF_INET, SOCK_DGRAM, 97 IPPROTO_UDP)) == -1) 98 fatalx("error creating socket"); 99 100 if (bind(xconf->rip_socket, (struct sockaddr *)&addr, 101 sizeof(addr)) == -1) 102 fatal("error binding socket"); 103 104 /* set some defaults */ 105 if (if_set_opt(xconf->rip_socket) == -1) 106 fatal("if_set_opt"); 107 108 if (if_set_mcast_ttl(xconf->rip_socket, IP_DEFAULT_MULTICAST_TTL) == -1) 109 fatal("if_set_mcast_ttl"); 110 111 if (if_set_mcast_loop(xconf->rip_socket) == -1) 112 fatal("if_set_mcast_loop"); 113 114 if (if_set_tos(xconf->rip_socket, IPTOS_PREC_INTERNETCONTROL) == -1) 115 fatal("if_set_tos"); 116 117 if_set_recvbuf(xconf->rip_socket); 118 119 oeconf = xconf; 120 121 if ((pw = getpwnam(RIPD_USER)) == NULL) 122 fatal("getpwnam"); 123 124 if (chroot(pw->pw_dir) == -1) 125 fatal("chroot"); 126 if (chdir("/") == -1) 127 fatal("chdir(\"/\")"); 128 129 setproctitle("rip engine"); 130 ripd_process = PROC_RIP_ENGINE; 131 132 if (setgroups(1, &pw->pw_gid) || 133 setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) || 134 setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid)) 135 fatal("can't drop privileges"); 136 137 event_init(); 138 nbr_init(NBR_HASHSIZE); 139 140 /* setup signal handler */ 141 signal_set(&ev_sigint, SIGINT, ripe_sig_handler, NULL); 142 signal_set(&ev_sigterm, SIGTERM, ripe_sig_handler, NULL); 143 signal_add(&ev_sigint, NULL); 144 signal_add(&ev_sigterm, NULL); 145 signal(SIGPIPE, SIG_IGN); 146 signal(SIGHUP, SIG_IGN); 147 148 /* setup pipes */ 149 close(pipe_parent2ripe[0]); 150 close(pipe_ripe2rde[1]); 151 close(pipe_parent2rde[0]); 152 close(pipe_parent2rde[1]); 153 154 if ((ibuf_rde = malloc(sizeof(struct imsgbuf))) == NULL || 155 (ibuf_main = malloc(sizeof(struct imsgbuf))) == NULL) 156 fatal(NULL); 157 imsg_init(ibuf_rde, pipe_ripe2rde[0], ripe_dispatch_rde); 158 imsg_init(ibuf_main, pipe_parent2ripe[1], ripe_dispatch_main); 159 160 /* setup event handler */ 161 ibuf_rde->events = EV_READ; 162 event_set(&ibuf_rde->ev, ibuf_rde->fd, ibuf_rde->events, 163 ibuf_rde->handler, ibuf_rde); 164 event_add(&ibuf_rde->ev, NULL); 165 166 ibuf_main->events = EV_READ; 167 event_set(&ibuf_main->ev, ibuf_main->fd, ibuf_main->events, 168 ibuf_main->handler, ibuf_main); 169 event_add(&ibuf_main->ev, NULL); 170 171 event_set(&oeconf->ev, oeconf->rip_socket, EV_READ|EV_PERSIST, 172 recv_packet, oeconf); 173 event_add(&oeconf->ev, NULL); 174 175 /* remove unneeded config stuff */ 176 while ((r = SIMPLEQ_FIRST(&oeconf->redist_list)) != NULL) { 177 SIMPLEQ_REMOVE_HEAD(&oeconf->redist_list, entry); 178 free(r); 179 } 180 181 /* listen on ripd control socket */ 182 TAILQ_INIT(&ctl_conns); 183 control_listen(); 184 185 if ((pkt_ptr = calloc(1, READ_BUF_SIZE)) == NULL) 186 fatal("ripe"); 187 188 /* start interfaces */ 189 LIST_FOREACH(iface, &xconf->iface_list, entry) { 190 if_init(xconf, iface); 191 if (if_fsm(iface, IF_EVT_UP)) 192 log_debug("ripe: error starting interface: %s", 193 iface->name); 194 } 195 196 evtimer_set(&oeconf->report_timer, report_timer, oeconf); 197 start_report_timer(); 198 199 ripe_imsg_compose_rde(IMSG_FULL_REQUEST, 0, 0, NULL, 0); 200 201 event_dispatch(); 202 203 ripe_shutdown(); 204 /* NOTREACHED */ 205 return (0); 206 } 207 208 int 209 ripe_imsg_compose_parent(int type, pid_t pid, void *data, u_int16_t datalen) 210 { 211 return (imsg_compose(ibuf_main, type, 0, pid, data, datalen)); 212 } 213 214 int 215 ripe_imsg_compose_rde(int type, u_int32_t peerid, pid_t pid, 216 void *data, u_int16_t datalen) 217 { 218 return (imsg_compose(ibuf_rde, type, peerid, pid, data, datalen)); 219 } 220 221 /* ARGSUSED */ 222 void 223 ripe_dispatch_main(int fd, short event, void *bula) 224 { 225 struct imsg imsg; 226 struct imsgbuf *ibuf = bula; 227 struct kif *kif; 228 struct iface *iface; 229 ssize_t n; 230 int link_ok, shut = 0; 231 232 switch (event) { 233 case EV_READ: 234 if ((n = imsg_read(ibuf)) == -1) 235 fatal("imsg_read error"); 236 if (n == 0) /* connection closed */ 237 shut = 1; 238 break; 239 case EV_WRITE: 240 if (msgbuf_write(&ibuf->w) == -1) 241 fatal("msgbuf_write"); 242 imsg_event_add(ibuf); 243 return; 244 default: 245 fatalx("unknown event"); 246 } 247 248 for (;;) { 249 if ((n = imsg_get(ibuf, &imsg)) == -1) 250 fatal("ripe_dispatch_main: imsg_read error"); 251 if (n == 0) 252 break; 253 254 switch (imsg.hdr.type) { 255 case IMSG_IFINFO: 256 if (imsg.hdr.len - IMSG_HEADER_SIZE != 257 sizeof(struct kif)) 258 fatalx("IFINFO imsg with wrong len"); 259 kif = imsg.data; 260 link_ok = (kif->flags & IFF_UP) && 261 (LINK_STATE_IS_UP(kif->link_state) || 262 (kif->link_state == LINK_STATE_UNKNOWN && 263 kif->media_type != IFT_CARP)); 264 265 LIST_FOREACH(iface, &oeconf->iface_list, entry) { 266 if (kif->ifindex == iface->ifindex) { 267 iface->flags = kif->flags; 268 iface->linkstate = kif->link_state; 269 270 if (link_ok) { 271 if_fsm(iface, IF_EVT_UP); 272 log_warnx("interface %s up", 273 iface->name); 274 } else { 275 if_fsm(iface, IF_EVT_DOWN); 276 log_warnx("interface %s down", 277 iface->name); 278 } 279 } 280 } 281 break; 282 case IMSG_CTL_IFINFO: 283 case IMSG_CTL_KROUTE: 284 case IMSG_CTL_KROUTE_ADDR: 285 case IMSG_CTL_END: 286 control_imsg_relay(&imsg); 287 break; 288 default: 289 log_debug("ripe_dispatch_main: error handling imsg %d", 290 imsg.hdr.type); 291 break; 292 } 293 imsg_free(&imsg); 294 } 295 if (!shut) 296 imsg_event_add(ibuf); 297 else { 298 /* this pipe is dead, so remove the event handler */ 299 event_del(&ibuf->ev); 300 event_loopexit(NULL); 301 } 302 } 303 304 /* ARGSUSED */ 305 void 306 ripe_dispatch_rde(int fd, short event, void *bula) 307 { 308 struct rip_route *rr; 309 struct imsg imsg; 310 struct imsgbuf *ibuf = bula; 311 struct iface *iface; 312 struct nbr *nbr; 313 ssize_t n; 314 int shut = 0; 315 316 switch (event) { 317 case EV_READ: 318 if ((n = imsg_read(ibuf)) == -1) 319 fatal("imsg_read error"); 320 if (n == 0) /* connection closed */ 321 shut = 1; 322 break; 323 case EV_WRITE: 324 if (msgbuf_write(&ibuf->w) == -1) 325 fatal("msgbuf_write"); 326 imsg_event_add(ibuf); 327 return; 328 default: 329 fatalx("unknown event"); 330 } 331 332 for (;;) { 333 if ((n = imsg_get(ibuf, &imsg)) == -1) 334 fatal("ripe_dispatch_rde: imsg_read error"); 335 if (n == 0) 336 break; 337 338 switch (imsg.hdr.type) { 339 case IMSG_REQUEST_ADD: 340 if (imsg.hdr.len - IMSG_HEADER_SIZE != sizeof(*rr)) 341 fatalx("invalid size of RDE request"); 342 343 if ((rr = malloc(sizeof(*rr))) == NULL) 344 fatal("ripe_dispatch_rde"); 345 346 memcpy(rr, imsg.data, sizeof(*rr)); 347 348 if (imsg.hdr.peerid != 0) { 349 if ((nbr = nbr_find_peerid(imsg.hdr.peerid)) == 350 NULL) { 351 log_debug("unknown neighbor id %u", 352 imsg.hdr.peerid); 353 break; 354 } 355 add_entry(&nbr->rq_list, rr); 356 break; 357 } 358 359 LIST_FOREACH(iface, &oeconf->iface_list, entry) { 360 add_entry(&iface->rq_list, rr); 361 } 362 break; 363 case IMSG_SEND_REQUEST: 364 if (imsg.hdr.peerid != 0) { 365 if ((nbr = nbr_find_peerid(imsg.hdr.peerid)) == 366 NULL) { 367 log_debug("unknown neighbor id %u", 368 imsg.hdr.peerid); 369 break; 370 } 371 send_request(&nbr->rq_list, NULL, nbr); 372 break; 373 } 374 375 LIST_FOREACH(iface, &oeconf->iface_list, entry) { 376 send_request(&iface->rq_list, iface, NULL); 377 } 378 break; 379 case IMSG_RESPONSE_ADD: 380 if (imsg.hdr.len - IMSG_HEADER_SIZE != sizeof(*rr)) 381 fatalx("invalid size of RDE request"); 382 383 if ((rr = malloc(sizeof(*rr))) == NULL) 384 fatal("ripe_dispatch_rde"); 385 386 memcpy(rr, imsg.data, sizeof(*rr)); 387 388 if (imsg.hdr.peerid == 0) { 389 LIST_FOREACH(iface, &oeconf->iface_list, entry) 390 add_entry(&iface->rp_list, rr); 391 392 break; 393 } 394 395 if ((nbr = nbr_find_peerid(imsg.hdr.peerid)) == NULL) { 396 log_debug("unknown neighbor id %u", 397 imsg.hdr.peerid); 398 break; 399 } 400 iface = nbr->iface; 401 add_entry(&nbr->rp_list, rr); 402 403 break; 404 case IMSG_SEND_RESPONSE: 405 if (imsg.hdr.peerid == 0) { 406 LIST_FOREACH(iface, &oeconf->iface_list, 407 entry) { 408 send_response(&iface->rp_list, 409 iface, NULL); 410 } 411 break; 412 } 413 414 if ((nbr = nbr_find_peerid(imsg.hdr.peerid)) == NULL) { 415 log_debug("unknown neighbor id %u", 416 imsg.hdr.peerid); 417 break; 418 } 419 send_response(&nbr->rp_list, NULL, nbr); 420 nbr_fsm(nbr, NBR_EVT_RESPONSE_SENT); 421 break; 422 case IMSG_SEND_TRIGGERED_UPDATE: 423 if (imsg.hdr.len - IMSG_HEADER_SIZE != sizeof(struct 424 rip_route)) 425 fatalx("invalid size of RDE request"); 426 427 rr = imsg.data; 428 429 LIST_FOREACH(iface, &oeconf->iface_list, 430 entry) { 431 if (rr->ifindex != iface->ifindex) 432 send_triggered_update(iface, rr); 433 } 434 break; 435 case IMSG_CTL_END: 436 case IMSG_CTL_SHOW_RIB: 437 control_imsg_relay(&imsg); 438 break; 439 default: 440 log_debug("ripe_dispatch_rde: error handling imsg %d", 441 imsg.hdr.type); 442 break; 443 } 444 imsg_free(&imsg); 445 } 446 if (!shut) 447 imsg_event_add(ibuf); 448 else { 449 /* this pipe is dead, so remove the event handler */ 450 event_del(&ibuf->ev); 451 event_loopexit(NULL); 452 } 453 } 454 455 void 456 ripe_shutdown(void) 457 { 458 struct iface *iface; 459 460 LIST_FOREACH(iface, &oeconf->iface_list, entry) { 461 if (if_fsm(iface, IF_EVT_DOWN)) { 462 log_debug("error stopping interface %s", 463 iface->name); 464 } 465 } 466 while ((iface = LIST_FIRST(&oeconf->iface_list)) != NULL) { 467 LIST_REMOVE(iface, entry); 468 if_del(iface); 469 } 470 471 close(oeconf->rip_socket); 472 473 /* clean up */ 474 msgbuf_write(&ibuf_rde->w); 475 msgbuf_clear(&ibuf_rde->w); 476 free(ibuf_rde); 477 msgbuf_write(&ibuf_main->w); 478 msgbuf_clear(&ibuf_main->w); 479 free(ibuf_main); 480 free(oeconf); 481 free(pkt_ptr); 482 483 log_info("rip engine exiting"); 484 _exit(0); 485 } 486 487 void 488 ripe_iface_ctl(struct ctl_conn *c, unsigned int idx) 489 { 490 struct iface *iface; 491 struct ctl_iface *ictl; 492 493 LIST_FOREACH(iface, &oeconf->iface_list, entry) { 494 if (idx == 0 || idx == iface->ifindex) { 495 ictl = if_to_ctl(iface); 496 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_IFACE, 497 0, 0, ictl, sizeof(struct ctl_iface)); 498 } 499 } 500 } 501 502 void 503 ripe_nbr_ctl(struct ctl_conn *c) 504 { 505 struct iface *iface; 506 struct nbr *nbr; 507 struct ctl_nbr *nctl; 508 509 LIST_FOREACH(iface, &oeconf->iface_list, entry) 510 LIST_FOREACH(nbr, &iface->nbr_list, entry) { 511 nctl = nbr_to_ctl(nbr); 512 imsg_compose(&c->ibuf, 513 IMSG_CTL_SHOW_NBR, 0, 0, nctl, 514 sizeof(struct ctl_nbr)); 515 } 516 517 imsg_compose(&c->ibuf, IMSG_CTL_END, 0, 0, NULL, 0); 518 } 519 520 void 521 ripe_demote_iface(struct iface *iface, int active) 522 { 523 struct demote_msg dmsg; 524 525 if (ripd_process != PROC_RIP_ENGINE || 526 iface->demote_group[0] == '\0') 527 return; 528 529 bzero(&dmsg, sizeof(dmsg)); 530 strlcpy(dmsg.demote_group, iface->demote_group, 531 sizeof(dmsg.demote_group)); 532 if (active) 533 dmsg.level = -1; 534 else 535 dmsg.level = 1; 536 537 ripe_imsg_compose_parent(IMSG_DEMOTE, 0, &dmsg, sizeof(dmsg)); 538 } 539