bgpd.c revision 1.88
1/* $OpenBSD: bgpd.c,v 1.88 2004/03/16 12:06:43 henning Exp $ */ 2 3/* 4 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19#include <sys/types.h> 20#include <sys/socket.h> 21#include <sys/wait.h> 22#include <netinet/in.h> 23#include <arpa/inet.h> 24#include <err.h> 25#include <errno.h> 26#include <fcntl.h> 27#include <poll.h> 28#include <pwd.h> 29#include <signal.h> 30#include <stdio.h> 31#include <stdlib.h> 32#include <string.h> 33#include <unistd.h> 34 35#include "mrt.h" 36#include "bgpd.h" 37#include "session.h" 38 39void sighdlr(int); 40void usage(void); 41int main(int, char *[]); 42int check_child(pid_t, const char *); 43int reconfigure(char *, struct bgpd_config *, struct mrt_head *, 44 struct peer **, struct filter_head *); 45int dispatch_imsg(struct imsgbuf *, int, struct mrt_head *); 46 47int rfd = -1; 48volatile sig_atomic_t mrtdump = 0; 49volatile sig_atomic_t quit = 0; 50volatile sig_atomic_t reconfig = 0; 51volatile sig_atomic_t sigchld = 0; 52struct imsgbuf ibuf_se; 53struct imsgbuf ibuf_rde; 54 55void 56sighdlr(int sig) 57{ 58 switch (sig) { 59 case SIGTERM: 60 case SIGINT: 61 quit = 1; 62 break; 63 case SIGCHLD: 64 sigchld = 1; 65 break; 66 case SIGHUP: 67 reconfig = 1; 68 break; 69 case SIGALRM: 70 case SIGUSR1: 71 mrtdump = 1; 72 break; 73 } 74} 75 76void 77usage(void) 78{ 79 extern char *__progname; 80 81 fprintf(stderr, "usage: %s [-dnv] ", __progname); 82 fprintf(stderr, "[-D macro=value] [-f file]\n"); 83 exit(1); 84} 85 86#define POLL_MAX 8 87#define PFD_PIPE_SESSION 0 88#define PFD_PIPE_ROUTE 1 89#define PFD_SOCK_ROUTE 2 90#define PFD_MRT_START 3 91 92int 93main(int argc, char *argv[]) 94{ 95 struct bgpd_config conf; 96 struct peer *peer_l, *p; 97 struct mrt_head mrt_l; 98 struct network_head net_l; 99 struct filter_head *rules_l; 100 struct network *net; 101 struct filter_rule *r; 102 struct mrt *(mrt[POLL_MAX]), *m; 103 struct pollfd pfd[POLL_MAX]; 104 pid_t io_pid = 0, rde_pid = 0, pid; 105 char *conffile; 106 int debug = 0; 107 int ch, i, j, n, nfds, timeout; 108 int pipe_m2s[2]; 109 int pipe_m2r[2]; 110 int pipe_s2r[2]; 111 112 conffile = CONFFILE; 113 bgpd_process = PROC_MAIN; 114 115 log_init(1); /* log to stderr until daemonized */ 116 117 if ((rules_l = calloc(1, sizeof(struct filter_head))) == NULL) 118 err(1, NULL); 119 120 bzero(&conf, sizeof(conf)); 121 LIST_INIT(&mrt_l); 122 TAILQ_INIT(&net_l); 123 TAILQ_INIT(rules_l); 124 peer_l = NULL; 125 126 while ((ch = getopt(argc, argv, "dD:f:nv")) != -1) { 127 switch (ch) { 128 case 'd': 129 debug = 1; 130 break; 131 case 'D': 132 if (cmdline_symset(optarg) < 0) 133 log_warnx("could not parse macro definition %s", 134 optarg); 135 break; 136 case 'f': 137 conffile = optarg; 138 break; 139 case 'n': 140 conf.opts |= BGPD_OPT_NOACTION; 141 break; 142 case 'v': 143 if (conf.opts & BGPD_OPT_VERBOSE) 144 conf.opts |= BGPD_OPT_VERBOSE2; 145 conf.opts |= BGPD_OPT_VERBOSE; 146 break; 147 default: 148 usage(); 149 /* NOTREACHED */ 150 } 151 } 152 153 if (parse_config(conffile, &conf, &mrt_l, &peer_l, &net_l, rules_l)) 154 exit(1); 155 156 if (conf.opts & BGPD_OPT_NOACTION) { 157 if (conf.opts & BGPD_OPT_VERBOSE) 158 print_config(&conf, &net_l, peer_l, rules_l, &mrt_l); 159 else 160 fprintf(stderr, "configuration OK\n"); 161 exit(0); 162 } 163 164 if (geteuid()) 165 errx(1, "need root privileges"); 166 167 if (getpwnam(BGPD_USER) == NULL) 168 errx(1, "unknown user %s", BGPD_USER); 169 endpwent(); 170 171 log_init(debug); 172 173 if (!debug) 174 daemon(1, 0); 175 176 log_info("startup"); 177 178 if (pipe(pipe_m2s) == -1) 179 fatal("pipe"); 180 if (fcntl(pipe_m2s[0], F_SETFL, O_NONBLOCK) == -1 || 181 fcntl(pipe_m2s[1], F_SETFL, O_NONBLOCK) == -1) 182 fatal("fcntl"); 183 if (pipe(pipe_m2r) == -1) 184 fatal("pipe"); 185 if (fcntl(pipe_m2r[0], F_SETFL, O_NONBLOCK) == -1 || 186 fcntl(pipe_m2r[1], F_SETFL, O_NONBLOCK) == -1) 187 fatal("fcntl"); 188 if (pipe(pipe_s2r) == -1) 189 fatal("pipe"); 190 if (fcntl(pipe_s2r[0], F_SETFL, O_NONBLOCK) == -1 || 191 fcntl(pipe_s2r[1], F_SETFL, O_NONBLOCK) == -1) 192 fatal("fcntl"); 193 194 /* fork children */ 195 rde_pid = rde_main(&conf, peer_l, &net_l, rules_l, &mrt_l, 196 pipe_m2r, pipe_s2r); 197 io_pid = session_main(&conf, peer_l, &net_l, rules_l, &mrt_l, 198 pipe_m2s, pipe_s2r); 199 200 setproctitle("parent"); 201 202 signal(SIGTERM, sighdlr); 203 signal(SIGINT, sighdlr); 204 signal(SIGCHLD, sighdlr); 205 signal(SIGHUP, sighdlr); 206 signal(SIGALRM, sighdlr); 207 signal(SIGUSR1, sighdlr); 208 209 close(pipe_m2s[1]); 210 close(pipe_m2r[1]); 211 close(pipe_s2r[0]); 212 close(pipe_s2r[1]); 213 214 imsg_init(&ibuf_se, pipe_m2s[0]); 215 imsg_init(&ibuf_rde, pipe_m2r[0]); 216 mrt_init(&ibuf_rde, &ibuf_se); 217 if ((rfd = kr_init(!(conf.flags & BGPD_FLAG_NO_FIB_UPDATE))) == -1) 218 quit = 1; 219 220 while ((net = TAILQ_FIRST(&net_l)) != NULL) { 221 TAILQ_REMOVE(&net_l, net, network_l); 222 free(net); 223 } 224 225 while ((r = TAILQ_FIRST(rules_l)) != NULL) { 226 TAILQ_REMOVE(rules_l, r, entries); 227 free(r); 228 } 229 230 while (quit == 0) { 231 pfd[PFD_PIPE_SESSION].fd = ibuf_se.sock; 232 pfd[PFD_PIPE_SESSION].events = POLLIN; 233 if (ibuf_se.w.queued) 234 pfd[PFD_PIPE_SESSION].events |= POLLOUT; 235 pfd[PFD_PIPE_ROUTE].fd = ibuf_rde.sock; 236 pfd[PFD_PIPE_ROUTE].events = POLLIN; 237 if (ibuf_rde.w.queued) 238 pfd[PFD_PIPE_ROUTE].events |= POLLOUT; 239 pfd[PFD_SOCK_ROUTE].fd = rfd; 240 pfd[PFD_SOCK_ROUTE].events = POLLIN; 241 i = PFD_MRT_START; 242 i = mrt_select(&mrt_l, pfd, mrt, i, POLL_MAX, &timeout); 243 244 if ((nfds = poll(pfd, i, INFTIM)) == -1) 245 if (errno != EINTR) { 246 log_warn("poll error"); 247 quit = 1; 248 } 249 250 if (nfds > 0 && (pfd[PFD_PIPE_SESSION].revents & POLLOUT)) 251 if ((n = msgbuf_write(&ibuf_se.w)) < 0) { 252 log_warn("pipe write error (to SE)"); 253 quit = 1; 254 } 255 256 if (nfds > 0 && (pfd[PFD_PIPE_ROUTE].revents & POLLOUT)) 257 if ((n = msgbuf_write(&ibuf_rde.w)) < 0) { 258 log_warn("pipe write error (to RDE)"); 259 quit = 1; 260 } 261 262 if (nfds > 0 && pfd[PFD_PIPE_SESSION].revents & POLLIN) { 263 nfds--; 264 if (dispatch_imsg(&ibuf_se, PFD_PIPE_SESSION, 265 &mrt_l) == -1) 266 quit = 1; 267 } 268 269 if (nfds > 0 && pfd[PFD_PIPE_ROUTE].revents & POLLIN) { 270 nfds--; 271 if (dispatch_imsg(&ibuf_rde, PFD_PIPE_ROUTE, 272 &mrt_l) == -1) 273 quit = 1; 274 } 275 276 if (nfds > 0 && pfd[PFD_SOCK_ROUTE].revents & POLLIN) { 277 nfds--; 278 if (kr_dispatch_msg() == -1) 279 quit = 1; 280 } 281 282 for (j = PFD_MRT_START; j < i && nfds > 0 ; j++) { 283 if (pfd[j].revents & POLLOUT) { 284 if ((n = mrt_write(mrt[j])) < 0) { 285 log_warn("mrt write error"); 286 } 287 } 288 } 289 290 if (reconfig) { 291 log_info("rereading config"); 292 reconfigure(conffile, &conf, &mrt_l, &peer_l, rules_l); 293 reconfig = 0; 294 } 295 296 if (sigchld) { 297 if (check_child(io_pid, "session engine")) 298 quit = 1; 299 if (check_child(rde_pid, "route decision engine")) 300 quit = 1; 301 sigchld = 0; 302 } 303 304 if (mrtdump == 1) { 305 mrt_handler(&mrt_l); 306 mrtdump = 0; 307 } 308 } 309 310 signal(SIGCHLD, SIG_IGN); 311 312 if (io_pid) 313 kill(io_pid, SIGTERM); 314 315 if (rde_pid) 316 kill(rde_pid, SIGTERM); 317 318 while ((p = peer_l) != NULL) { 319 peer_l = p->next; 320 free(p); 321 } 322 while ((m = LIST_FIRST(&mrt_l)) != NULL) { 323 LIST_REMOVE(m, list); 324 free(m); 325 } 326 327 free(rules_l); 328 control_cleanup(); 329 kr_shutdown(); 330 331 do { 332 if ((pid = wait(NULL)) == -1 && 333 errno != EINTR && errno != ECHILD) 334 fatal("wait"); 335 } while (pid != -1 || (pid == -1 && errno == EINTR)); 336 337 log_info("Terminating"); 338 return (0); 339} 340 341int 342check_child(pid_t pid, const char *pname) 343{ 344 int status; 345 346 if (waitpid(pid, &status, WNOHANG) > 0) { 347 if (WIFEXITED(status)) { 348 log_warnx("Lost child: %s exited", pname); 349 return (1); 350 } 351 if (WIFSIGNALED(status)) { 352 log_warnx("Lost child: %s terminated; signal %d", 353 pname, WTERMSIG(status)); 354 return (1); 355 } 356 } 357 358 return (0); 359} 360 361int 362reconfigure(char *conffile, struct bgpd_config *conf, struct mrt_head *mrt_l, 363 struct peer **peer_l, struct filter_head *rules_l) 364{ 365 struct network_head net_l; 366 struct network *n; 367 struct peer *p; 368 struct filter_rule *r; 369 370 if (parse_config(conffile, conf, mrt_l, peer_l, &net_l, rules_l)) { 371 log_warnx("config file %s has errors, not reloading", 372 conffile); 373 return (-1); 374 } 375 376 if (imsg_compose(&ibuf_se, IMSG_RECONF_CONF, 0, 377 conf, sizeof(struct bgpd_config)) == -1) 378 return (-1); 379 if (imsg_compose(&ibuf_rde, IMSG_RECONF_CONF, 0, 380 conf, sizeof(struct bgpd_config)) == -1) 381 return (-1); 382 for (p = *peer_l; p != NULL; p = p->next) { 383 if (imsg_compose(&ibuf_se, IMSG_RECONF_PEER, p->conf.id, 384 &p->conf, sizeof(struct peer_config)) == -1) 385 return (-1); 386 if (imsg_compose(&ibuf_rde, IMSG_RECONF_PEER, p->conf.id, 387 &p->conf, sizeof(struct peer_config)) == -1) 388 return (-1); 389 } 390 while ((n = TAILQ_FIRST(&net_l)) != NULL) { 391 if (imsg_compose(&ibuf_rde, IMSG_RECONF_NETWORK, 0, 392 &n->net, sizeof(struct network_config)) == -1) 393 return (-1); 394 TAILQ_REMOVE(&net_l, n, network_l); 395 free(n); 396 } 397 while ((r = TAILQ_FIRST(rules_l)) != NULL) { 398 if (imsg_compose(&ibuf_rde, IMSG_RECONF_FILTER, 0, 399 r, sizeof(struct filter_rule)) == -1) 400 return (-1); 401 TAILQ_REMOVE(rules_l, r, entries); 402 free(r); 403 } 404 if (imsg_compose(&ibuf_se, IMSG_RECONF_DONE, 0, NULL, 0) == -1 || 405 imsg_compose(&ibuf_rde, IMSG_RECONF_DONE, 0, NULL, 0) == -1) 406 return (-1); 407 408 return (0); 409} 410 411int 412dispatch_imsg(struct imsgbuf *ibuf, int idx, struct mrt_head *mrt_l) 413{ 414 struct imsg imsg; 415 int n; 416 417 if ((n = imsg_read(ibuf)) == -1) 418 return (-1); 419 420 if (n == 0) { /* connection closed */ 421 log_warnx("dispatch_imsg in main: pipe closed"); 422 return (-1); 423 } 424 425 for (;;) { 426 if ((n = imsg_get(ibuf, &imsg)) == -1) 427 return (-1); 428 429 if (n == 0) 430 break; 431 432 switch (imsg.hdr.type) { 433 case IMSG_MRT_MSG: 434 case IMSG_MRT_END: 435 if (mrt_queue(mrt_l, &imsg) == -1) 436 log_warnx("mrt_queue failed."); 437 break; 438 case IMSG_KROUTE_CHANGE: 439 if (idx != PFD_PIPE_ROUTE) 440 log_warnx("route request not from RDE"); 441 else if (kr_change(imsg.data)) 442 return (-1); 443 break; 444 case IMSG_KROUTE_DELETE: 445 if (idx != PFD_PIPE_ROUTE) 446 log_warnx("route request not from RDE"); 447 else if (kr_delete(imsg.data)) 448 return (-1); 449 break; 450 case IMSG_NEXTHOP_ADD: 451 if (idx != PFD_PIPE_ROUTE) 452 log_warnx("nexthop request not from RDE"); 453 else 454 if (imsg.hdr.len != IMSG_HEADER_SIZE + 455 sizeof(struct bgpd_addr)) 456 log_warnx("wrong imsg len"); 457 else if (kr_nexthop_add(imsg.data) == -1) 458 return (-1); 459 break; 460 case IMSG_NEXTHOP_REMOVE: 461 if (idx != PFD_PIPE_ROUTE) 462 log_warnx("nexthop request not from RDE"); 463 else 464 if (imsg.hdr.len != IMSG_HEADER_SIZE + 465 sizeof(struct bgpd_addr)) 466 log_warnx("wrong imsg len"); 467 else kr_nexthop_delete(imsg.data); 468 break; 469 case IMSG_CTL_RELOAD: 470 if (idx != PFD_PIPE_SESSION) 471 log_warnx("reload request not from SE"); 472 else 473 reconfig = 1; 474 break; 475 case IMSG_CTL_FIB_COUPLE: 476 if (idx != PFD_PIPE_SESSION) 477 log_warnx("couple request not from SE"); 478 else 479 kr_fib_couple(); 480 break; 481 case IMSG_CTL_FIB_DECOUPLE: 482 if (idx != PFD_PIPE_SESSION) 483 log_warnx("decouple request not from SE"); 484 else 485 kr_fib_decouple(); 486 break; 487 case IMSG_CTL_KROUTE: 488 case IMSG_CTL_KROUTE_ADDR: 489 case IMSG_CTL_SHOW_NEXTHOP: 490 case IMSG_CTL_SHOW_INTERFACE: 491 if (idx != PFD_PIPE_SESSION) 492 log_warnx("kroute request not from SE"); 493 else 494 kr_show_route(&imsg); 495 break; 496 default: 497 break; 498 } 499 imsg_free(&imsg); 500 } 501 return (0); 502} 503 504void 505send_nexthop_update(struct kroute_nexthop *msg) 506{ 507 char *gw = NULL; 508 509 if (msg->gateway.af) 510 if (asprintf(&gw, ": via %s", 511 log_addr(&msg->gateway)) == -1) { 512 log_warn("send_nexthop_update"); 513 quit = 1; 514 } 515 516 log_info("nexthop %s now %s%s%s", log_addr(&msg->nexthop), 517 msg->valid ? "valid" : "invalid", 518 msg->connected ? ": directly connected" : "", 519 msg->gateway.af ? gw : ""); 520 521 free(gw); 522 523 if (imsg_compose(&ibuf_rde, IMSG_NEXTHOP_UPDATE, 0, 524 msg, sizeof(struct kroute_nexthop)) == -1) 525 quit = 1; 526} 527 528void 529send_imsg_session(int type, pid_t pid, void *data, u_int16_t datalen) 530{ 531 imsg_compose_pid(&ibuf_se, type, pid, data, datalen); 532} 533