1 /* $OpenBSD: ripe.c,v 1.22 2016/09/03 10:28:08 renato 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 39 #include "ripd.h" 40 #include "rip.h" 41 #include "ripe.h" 42 #include "log.h" 43 #include "control.h" 44 45 void ripe_sig_handler(int, short, void *); 46 __dead void ripe_shutdown(void); 47 48 struct ripd_conf *oeconf = NULL; 49 struct imsgev *iev_main; 50 struct imsgev *iev_rde; 51 52 /* ARGSUSED */ 53 void 54 ripe_sig_handler(int sig, short event, void *bula) 55 { 56 switch (sig) { 57 case SIGINT: 58 case SIGTERM: 59 ripe_shutdown(); 60 /* NOTREACHED */ 61 default: 62 fatalx("unexpected signal"); 63 } 64 } 65 66 /* rip engine */ 67 pid_t 68 ripe(struct ripd_conf *xconf, int pipe_parent2ripe[2], int pipe_ripe2rde[2], 69 int pipe_parent2rde[2]) 70 { 71 struct event ev_sigint, ev_sigterm; 72 struct sockaddr_in addr; 73 struct iface *iface = NULL; 74 struct passwd *pw; 75 struct redistribute *r; 76 pid_t pid; 77 78 switch (pid = fork()) { 79 case -1: 80 fatal("cannot fork"); 81 case 0: 82 break; 83 default: 84 return (pid); 85 } 86 87 /* create ripd control socket outside chroot */ 88 if (control_init(xconf->csock) == -1) 89 fatalx("control socket setup failed"); 90 91 addr.sin_family = AF_INET; 92 addr.sin_port = htons(RIP_PORT); 93 addr.sin_addr.s_addr = INADDR_ANY; 94 95 if ((xconf->rip_socket = socket(AF_INET, 96 SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 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 log_procname = log_procnames[ripd_process]; 132 133 if (setgroups(1, &pw->pw_gid) || 134 setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) || 135 setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid)) 136 fatal("can't drop privileges"); 137 138 event_init(); 139 nbr_init(NBR_HASHSIZE); 140 141 /* setup signal handler */ 142 signal_set(&ev_sigint, SIGINT, ripe_sig_handler, NULL); 143 signal_set(&ev_sigterm, SIGTERM, ripe_sig_handler, NULL); 144 signal_add(&ev_sigint, NULL); 145 signal_add(&ev_sigterm, NULL); 146 signal(SIGPIPE, SIG_IGN); 147 signal(SIGHUP, SIG_IGN); 148 149 /* setup pipes */ 150 close(pipe_parent2ripe[0]); 151 close(pipe_ripe2rde[1]); 152 close(pipe_parent2rde[0]); 153 close(pipe_parent2rde[1]); 154 155 if ((iev_rde = malloc(sizeof(struct imsgev))) == NULL || 156 (iev_main = malloc(sizeof(struct imsgev))) == NULL) 157 fatal(NULL); 158 imsg_init(&iev_rde->ibuf, pipe_ripe2rde[0]); 159 iev_rde->handler = ripe_dispatch_rde; 160 imsg_init(&iev_main->ibuf, pipe_parent2ripe[1]); 161 iev_main->handler = ripe_dispatch_main; 162 163 /* setup event handler */ 164 iev_rde->events = EV_READ; 165 event_set(&iev_rde->ev, iev_rde->ibuf.fd, iev_rde->events, 166 iev_rde->handler, iev_rde); 167 event_add(&iev_rde->ev, NULL); 168 169 iev_main->events = EV_READ; 170 event_set(&iev_main->ev, iev_main->ibuf.fd, iev_main->events, 171 iev_main->handler, iev_main); 172 event_add(&iev_main->ev, NULL); 173 174 event_set(&oeconf->ev, oeconf->rip_socket, EV_READ|EV_PERSIST, 175 recv_packet, oeconf); 176 event_add(&oeconf->ev, NULL); 177 178 /* remove unneeded config stuff */ 179 while ((r = SIMPLEQ_FIRST(&oeconf->redist_list)) != NULL) { 180 SIMPLEQ_REMOVE_HEAD(&oeconf->redist_list, entry); 181 free(r); 182 } 183 184 /* listen on ripd control socket */ 185 TAILQ_INIT(&ctl_conns); 186 control_listen(); 187 188 if ((pkt_ptr = calloc(1, IBUF_READ_SIZE)) == NULL) 189 fatal("ripe"); 190 191 /* start interfaces */ 192 LIST_FOREACH(iface, &xconf->iface_list, entry) { 193 if_init(xconf, iface); 194 if (if_fsm(iface, IF_EVT_UP)) 195 log_debug("ripe: error starting interface: %s", 196 iface->name); 197 } 198 199 evtimer_set(&oeconf->report_timer, report_timer, oeconf); 200 start_report_timer(); 201 202 ripe_imsg_compose_rde(IMSG_FULL_REQUEST, 0, 0, NULL, 0); 203 204 event_dispatch(); 205 206 ripe_shutdown(); 207 /* NOTREACHED */ 208 return (0); 209 } 210 211 int 212 ripe_imsg_compose_parent(int type, pid_t pid, void *data, u_int16_t datalen) 213 { 214 return (imsg_compose_event(iev_main, type, 0, pid, -1, data, datalen)); 215 } 216 217 int 218 ripe_imsg_compose_rde(int type, u_int32_t peerid, pid_t pid, 219 void *data, u_int16_t datalen) 220 { 221 return (imsg_compose_event(iev_rde, type, peerid, pid, -1, 222 data, datalen)); 223 } 224 225 /* ARGSUSED */ 226 void 227 ripe_dispatch_main(int fd, short event, void *bula) 228 { 229 struct imsg imsg; 230 struct imsgev *iev = bula; 231 struct imsgbuf *ibuf = &iev->ibuf; 232 struct kif *kif; 233 struct iface *iface; 234 ssize_t n; 235 int link_ok, shut = 0; 236 237 if (event & EV_READ) { 238 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN) 239 fatal("imsg_read error"); 240 if (n == 0) /* connection closed */ 241 shut = 1; 242 } 243 if (event & EV_WRITE) { 244 if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN) 245 fatal("msgbuf_write"); 246 if (n == 0) /* connection closed */ 247 shut = 1; 248 } 249 250 for (;;) { 251 if ((n = imsg_get(ibuf, &imsg)) == -1) 252 fatal("ripe_dispatch_main: imsg_get error"); 253 if (n == 0) 254 break; 255 256 switch (imsg.hdr.type) { 257 case IMSG_IFINFO: 258 if (imsg.hdr.len - IMSG_HEADER_SIZE != 259 sizeof(struct kif)) 260 fatalx("IFINFO imsg with wrong len"); 261 kif = imsg.data; 262 link_ok = (kif->flags & IFF_UP) && 263 LINK_STATE_IS_UP(kif->link_state); 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(iev); 297 else { 298 /* this pipe is dead, so remove the event handler */ 299 event_del(&iev->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 imsgev *iev = bula; 311 struct imsgbuf *ibuf = &iev->ibuf; 312 struct iface *iface; 313 struct nbr *nbr; 314 ssize_t n; 315 int shut = 0; 316 317 if (event & EV_READ) { 318 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN) 319 fatal("imsg_read error"); 320 if (n == 0) /* connection closed */ 321 shut = 1; 322 } 323 if (event & EV_WRITE) { 324 if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN) 325 fatal("msgbuf_write"); 326 if (n == 0) /* connection closed */ 327 shut = 1; 328 } 329 330 for (;;) { 331 if ((n = imsg_get(ibuf, &imsg)) == -1) 332 fatal("ripe_dispatch_rde: imsg_get error"); 333 if (n == 0) 334 break; 335 336 switch (imsg.hdr.type) { 337 case IMSG_REQUEST_ADD: 338 if (imsg.hdr.len - IMSG_HEADER_SIZE != sizeof(*rr)) 339 fatalx("invalid size of RDE request"); 340 341 if ((rr = malloc(sizeof(*rr))) == NULL) 342 fatal("ripe_dispatch_rde"); 343 344 memcpy(rr, imsg.data, sizeof(*rr)); 345 346 if (imsg.hdr.peerid != 0) { 347 if ((nbr = nbr_find_peerid(imsg.hdr.peerid)) == 348 NULL) { 349 log_debug("unknown neighbor id %u", 350 imsg.hdr.peerid); 351 break; 352 } 353 add_entry(&nbr->rq_list, rr); 354 break; 355 } 356 357 LIST_FOREACH(iface, &oeconf->iface_list, entry) { 358 add_entry(&iface->rq_list, rr); 359 } 360 break; 361 case IMSG_SEND_REQUEST: 362 if (imsg.hdr.peerid != 0) { 363 if ((nbr = nbr_find_peerid(imsg.hdr.peerid)) == 364 NULL) { 365 log_debug("unknown neighbor id %u", 366 imsg.hdr.peerid); 367 break; 368 } 369 send_request(&nbr->rq_list, NULL, nbr); 370 break; 371 } 372 373 LIST_FOREACH(iface, &oeconf->iface_list, entry) { 374 send_request(&iface->rq_list, iface, NULL); 375 } 376 break; 377 case IMSG_RESPONSE_ADD: 378 if (imsg.hdr.len - IMSG_HEADER_SIZE != sizeof(*rr)) 379 fatalx("invalid size of RDE request"); 380 381 if ((rr = malloc(sizeof(*rr))) == NULL) 382 fatal("ripe_dispatch_rde"); 383 384 memcpy(rr, imsg.data, sizeof(*rr)); 385 386 if (imsg.hdr.peerid == 0) { 387 LIST_FOREACH(iface, &oeconf->iface_list, entry) 388 add_entry(&iface->rp_list, rr); 389 390 break; 391 } 392 393 if ((nbr = nbr_find_peerid(imsg.hdr.peerid)) == NULL) { 394 log_debug("unknown neighbor id %u", 395 imsg.hdr.peerid); 396 break; 397 } 398 iface = nbr->iface; 399 add_entry(&nbr->rp_list, rr); 400 401 break; 402 case IMSG_SEND_RESPONSE: 403 if (imsg.hdr.peerid == 0) { 404 LIST_FOREACH(iface, &oeconf->iface_list, 405 entry) { 406 send_response(&iface->rp_list, 407 iface, NULL); 408 } 409 break; 410 } 411 412 if ((nbr = nbr_find_peerid(imsg.hdr.peerid)) == NULL) { 413 log_debug("unknown neighbor id %u", 414 imsg.hdr.peerid); 415 break; 416 } 417 send_response(&nbr->rp_list, NULL, nbr); 418 nbr_fsm(nbr, NBR_EVT_RESPONSE_SENT); 419 break; 420 case IMSG_SEND_TRIGGERED_UPDATE: 421 if (imsg.hdr.len - IMSG_HEADER_SIZE != sizeof(struct 422 rip_route)) 423 fatalx("invalid size of RDE request"); 424 425 rr = imsg.data; 426 427 LIST_FOREACH(iface, &oeconf->iface_list, 428 entry) { 429 if (rr->ifindex != iface->ifindex) 430 send_triggered_update(iface, rr); 431 } 432 break; 433 case IMSG_CTL_END: 434 case IMSG_CTL_SHOW_RIB: 435 control_imsg_relay(&imsg); 436 break; 437 default: 438 log_debug("ripe_dispatch_rde: error handling imsg %d", 439 imsg.hdr.type); 440 break; 441 } 442 imsg_free(&imsg); 443 } 444 if (!shut) 445 imsg_event_add(iev); 446 else { 447 /* this pipe is dead, so remove the event handler */ 448 event_del(&iev->ev); 449 event_loopexit(NULL); 450 } 451 } 452 453 __dead void 454 ripe_shutdown(void) 455 { 456 struct iface *iface; 457 458 /* close pipes */ 459 msgbuf_write(&iev_rde->ibuf.w); 460 msgbuf_clear(&iev_rde->ibuf.w); 461 close(iev_rde->ibuf.fd); 462 msgbuf_write(&iev_main->ibuf.w); 463 msgbuf_clear(&iev_main->ibuf.w); 464 close(iev_main->ibuf.fd); 465 466 LIST_FOREACH(iface, &oeconf->iface_list, entry) { 467 if (if_fsm(iface, IF_EVT_DOWN)) { 468 log_debug("error stopping interface %s", 469 iface->name); 470 } 471 } 472 while ((iface = LIST_FIRST(&oeconf->iface_list)) != NULL) { 473 LIST_REMOVE(iface, entry); 474 if_del(iface); 475 } 476 477 close(oeconf->rip_socket); 478 479 /* clean up */ 480 free(iev_rde); 481 free(iev_main); 482 free(oeconf); 483 free(pkt_ptr); 484 485 log_info("rip engine exiting"); 486 _exit(0); 487 } 488 489 void 490 ripe_iface_ctl(struct ctl_conn *c, unsigned int idx) 491 { 492 struct iface *iface; 493 struct ctl_iface *ictl; 494 495 LIST_FOREACH(iface, &oeconf->iface_list, entry) { 496 if (idx == 0 || idx == iface->ifindex) { 497 ictl = if_to_ctl(iface); 498 imsg_compose_event(&c->iev, IMSG_CTL_SHOW_IFACE, 499 0, 0, -1, ictl, sizeof(struct ctl_iface)); 500 } 501 } 502 } 503 504 void 505 ripe_nbr_ctl(struct ctl_conn *c) 506 { 507 struct iface *iface; 508 struct nbr *nbr; 509 struct ctl_nbr *nctl; 510 511 LIST_FOREACH(iface, &oeconf->iface_list, entry) 512 LIST_FOREACH(nbr, &iface->nbr_list, entry) { 513 nctl = nbr_to_ctl(nbr); 514 imsg_compose_event(&c->iev, 515 IMSG_CTL_SHOW_NBR, 0, 0, -1, nctl, 516 sizeof(struct ctl_nbr)); 517 } 518 519 imsg_compose_event(&c->iev, IMSG_CTL_END, 0, 0, -1, NULL, 0); 520 } 521 522 void 523 ripe_demote_iface(struct iface *iface, int active) 524 { 525 struct demote_msg dmsg; 526 527 if (ripd_process != PROC_RIP_ENGINE || 528 iface->demote_group[0] == '\0') 529 return; 530 531 bzero(&dmsg, sizeof(dmsg)); 532 strlcpy(dmsg.demote_group, iface->demote_group, 533 sizeof(dmsg.demote_group)); 534 if (active) 535 dmsg.level = -1; 536 else 537 dmsg.level = 1; 538 539 ripe_imsg_compose_parent(IMSG_DEMOTE, 0, &dmsg, sizeof(dmsg)); 540 } 541