1 /* $OpenBSD: unwind.c,v 1.75 2024/11/21 13:35:20 claudio Exp $ */ 2 3 /* 4 * Copyright (c) 2018 Florian Obser <florian@openbsd.org> 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 #include <sys/types.h> 22 #include <sys/queue.h> 23 #include <sys/socket.h> 24 #include <sys/stat.h> 25 #include <sys/syslog.h> 26 #include <sys/wait.h> 27 28 #include <net/if.h> 29 #include <net/route.h> 30 31 #include <err.h> 32 #include <errno.h> 33 #include <event.h> 34 #include <fcntl.h> 35 #include <imsg.h> 36 #include <netdb.h> 37 #include <asr.h> 38 #include <pwd.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <signal.h> 43 #include <unistd.h> 44 45 #include "log.h" 46 #include "unwind.h" 47 #include "frontend.h" 48 #include "resolver.h" 49 #include "control.h" 50 51 #define TRUST_ANCHOR_FILE "/var/db/unwind.key" 52 53 enum uw_process { 54 PROC_MAIN, 55 PROC_RESOLVER, 56 PROC_FRONTEND, 57 }; 58 59 __dead void usage(void); 60 __dead void main_shutdown(void); 61 62 void main_sig_handler(int, short, void *); 63 64 static pid_t start_child(enum uw_process, char *, int, int, int); 65 66 void main_dispatch_frontend(int, short, void *); 67 void main_dispatch_resolver(int, short, void *); 68 69 static int main_imsg_send_ipc_sockets(struct imsgbuf *, struct imsgbuf *); 70 static int main_imsg_send_config(struct uw_conf *); 71 72 int main_reload(void); 73 int main_sendall(enum imsg_type, void *, uint16_t); 74 void open_ports(void); 75 void solicit_dns_proposals(void); 76 void send_blocklist_fd(void); 77 78 struct uw_conf *main_conf; 79 static struct imsgev *iev_frontend; 80 static struct imsgev *iev_resolver; 81 char *conffile; 82 pid_t frontend_pid; 83 pid_t resolver_pid; 84 uint32_t cmd_opts; 85 int routesock; 86 87 void 88 main_sig_handler(int sig, short event, void *arg) 89 { 90 /* 91 * Normal signal handler rules don't apply because libevent 92 * decouples for us. 93 */ 94 95 switch (sig) { 96 case SIGTERM: 97 case SIGINT: 98 main_shutdown(); 99 break; 100 case SIGHUP: 101 if (main_reload() == -1) 102 log_warnx("configuration reload failed"); 103 else 104 log_debug("configuration reloaded"); 105 break; 106 default: 107 fatalx("unexpected signal"); 108 } 109 } 110 111 __dead void 112 usage(void) 113 { 114 extern char *__progname; 115 116 fprintf(stderr, "usage: %s [-dnv] [-f file] [-s socket]\n", 117 __progname); 118 exit(1); 119 } 120 121 int 122 main(int argc, char *argv[]) 123 { 124 struct event ev_sigint, ev_sigterm, ev_sighup; 125 int ch, debug = 0, resolver_flag = 0, frontend_flag = 0; 126 int frontend_routesock, rtfilter; 127 int pipe_main2frontend[2], pipe_main2resolver[2]; 128 int control_fd, ta_fd; 129 char *csock, *saved_argv0; 130 131 csock = _PATH_UNWIND_SOCKET; 132 133 log_init(1, LOG_DAEMON); /* Log to stderr until daemonized. */ 134 log_setverbose(1); 135 136 saved_argv0 = argv[0]; 137 if (saved_argv0 == NULL) 138 saved_argv0 = "unwind"; 139 140 while ((ch = getopt(argc, argv, "dEFf:ns:v")) != -1) { 141 switch (ch) { 142 case 'd': 143 debug = 1; 144 break; 145 case 'E': 146 resolver_flag = 1; 147 break; 148 case 'F': 149 frontend_flag = 1; 150 break; 151 case 'f': 152 conffile = optarg; 153 break; 154 case 'n': 155 cmd_opts |= OPT_NOACTION; 156 break; 157 case 's': 158 csock = optarg; 159 break; 160 case 'v': 161 if (cmd_opts & OPT_VERBOSE2) 162 cmd_opts |= OPT_VERBOSE3; 163 if (cmd_opts & OPT_VERBOSE) 164 cmd_opts |= OPT_VERBOSE2; 165 cmd_opts |= OPT_VERBOSE; 166 break; 167 default: 168 usage(); 169 } 170 } 171 172 argc -= optind; 173 argv += optind; 174 if (argc > 0 || (resolver_flag && frontend_flag)) 175 usage(); 176 177 if (resolver_flag) 178 resolver(debug, cmd_opts & (OPT_VERBOSE | OPT_VERBOSE2 | 179 OPT_VERBOSE3)); 180 else if (frontend_flag) 181 frontend(debug, cmd_opts & (OPT_VERBOSE | OPT_VERBOSE2 | 182 OPT_VERBOSE3)); 183 184 if ((main_conf = parse_config(conffile)) == NULL) 185 exit(1); 186 187 if (cmd_opts & OPT_NOACTION) { 188 if (cmd_opts & OPT_VERBOSE) 189 print_config(main_conf); 190 else 191 fprintf(stderr, "configuration OK\n"); 192 exit(0); 193 } 194 195 /* Check for root privileges. */ 196 if (geteuid()) 197 errx(1, "need root privileges"); 198 199 /* Check for assigned daemon user */ 200 if (getpwnam(UNWIND_USER) == NULL) 201 errx(1, "unknown user %s", UNWIND_USER); 202 203 log_init(debug, LOG_DAEMON); 204 log_setverbose(cmd_opts & (OPT_VERBOSE | OPT_VERBOSE2 | OPT_VERBOSE3)); 205 206 if (!debug) 207 daemon(1, 0); 208 209 if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 210 PF_UNSPEC, pipe_main2frontend) == -1) 211 fatal("main2frontend socketpair"); 212 if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 213 PF_UNSPEC, pipe_main2resolver) == -1) 214 fatal("main2resolver socketpair"); 215 216 /* Start children. */ 217 resolver_pid = start_child(PROC_RESOLVER, saved_argv0, 218 pipe_main2resolver[1], debug, cmd_opts & (OPT_VERBOSE | 219 OPT_VERBOSE2 | OPT_VERBOSE3)); 220 frontend_pid = start_child(PROC_FRONTEND, saved_argv0, 221 pipe_main2frontend[1], debug, cmd_opts & (OPT_VERBOSE | 222 OPT_VERBOSE2 | OPT_VERBOSE3)); 223 224 log_procinit("main"); 225 226 event_init(); 227 228 /* Setup signal handler. */ 229 signal_set(&ev_sigint, SIGINT, main_sig_handler, NULL); 230 signal_set(&ev_sigterm, SIGTERM, main_sig_handler, NULL); 231 signal_set(&ev_sighup, SIGHUP, main_sig_handler, NULL); 232 signal_add(&ev_sigint, NULL); 233 signal_add(&ev_sigterm, NULL); 234 signal_add(&ev_sighup, NULL); 235 signal(SIGPIPE, SIG_IGN); 236 237 /* Setup pipes to children. */ 238 239 if ((iev_frontend = malloc(sizeof(struct imsgev))) == NULL || 240 (iev_resolver = malloc(sizeof(struct imsgev))) == NULL) 241 fatal(NULL); 242 if (imsgbuf_init(&iev_frontend->ibuf, pipe_main2frontend[0]) == -1) 243 fatal(NULL); 244 imsgbuf_allow_fdpass(&iev_frontend->ibuf); 245 iev_frontend->handler = main_dispatch_frontend; 246 if (imsgbuf_init(&iev_resolver->ibuf, pipe_main2resolver[0]) == -1) 247 fatal(NULL); 248 imsgbuf_allow_fdpass(&iev_resolver->ibuf); 249 iev_resolver->handler = main_dispatch_resolver; 250 251 /* Setup event handlers for pipes. */ 252 iev_frontend->events = EV_READ; 253 event_set(&iev_frontend->ev, iev_frontend->ibuf.fd, 254 iev_frontend->events, iev_frontend->handler, iev_frontend); 255 event_add(&iev_frontend->ev, NULL); 256 257 iev_resolver->events = EV_READ; 258 event_set(&iev_resolver->ev, iev_resolver->ibuf.fd, 259 iev_resolver->events, iev_resolver->handler, iev_resolver); 260 event_add(&iev_resolver->ev, NULL); 261 262 if (main_imsg_send_ipc_sockets(&iev_frontend->ibuf, 263 &iev_resolver->ibuf)) 264 fatal("could not establish imsg links"); 265 266 open_ports(); 267 268 if ((control_fd = control_init(csock)) == -1) 269 fatalx("control socket setup failed"); 270 271 if ((frontend_routesock = socket(AF_ROUTE, SOCK_RAW | SOCK_CLOEXEC | 272 SOCK_NONBLOCK, 0)) == -1) 273 fatal("route socket"); 274 275 rtfilter = ROUTE_FILTER(RTM_IFINFO) | ROUTE_FILTER(RTM_PROPOSAL) 276 | ROUTE_FILTER(RTM_IFANNOUNCE) | ROUTE_FILTER(RTM_NEWADDR) 277 | ROUTE_FILTER(RTM_DELADDR); 278 if (setsockopt(frontend_routesock, AF_ROUTE, ROUTE_MSGFILTER, 279 &rtfilter, sizeof(rtfilter)) == -1) 280 fatal("setsockopt(ROUTE_MSGFILTER)"); 281 282 if ((routesock = socket(AF_ROUTE, SOCK_RAW | SOCK_CLOEXEC | 283 SOCK_NONBLOCK, 0)) == -1) 284 fatal("route socket"); 285 shutdown(routesock, SHUT_RD); 286 287 if ((ta_fd = open(TRUST_ANCHOR_FILE, O_RDWR | O_CREAT, 0644)) == -1) 288 log_warn("%s", TRUST_ANCHOR_FILE); 289 290 /* receiver handles failed open correctly */ 291 main_imsg_compose_frontend_fd(IMSG_TAFD, 0, ta_fd); 292 293 main_imsg_compose_frontend_fd(IMSG_CONTROLFD, 0, control_fd); 294 main_imsg_compose_frontend_fd(IMSG_ROUTESOCK, 0, frontend_routesock); 295 main_imsg_send_config(main_conf); 296 297 if (main_conf->blocklist_file != NULL) 298 send_blocklist_fd(); 299 300 if (pledge("stdio rpath sendfd", NULL) == -1) 301 fatal("pledge"); 302 303 main_imsg_compose_frontend(IMSG_STARTUP, 0, NULL, 0); 304 main_imsg_compose_resolver(IMSG_STARTUP, 0, NULL, 0); 305 306 event_dispatch(); 307 308 main_shutdown(); 309 return (0); 310 } 311 312 __dead void 313 main_shutdown(void) 314 { 315 pid_t pid; 316 int status; 317 318 /* Close pipes. */ 319 imsgbuf_clear(&iev_frontend->ibuf); 320 close(iev_frontend->ibuf.fd); 321 imsgbuf_clear(&iev_resolver->ibuf); 322 close(iev_resolver->ibuf.fd); 323 324 config_clear(main_conf); 325 326 log_debug("waiting for children to terminate"); 327 do { 328 pid = wait(&status); 329 if (pid == -1) { 330 if (errno != EINTR && errno != ECHILD) 331 fatal("wait"); 332 } else if (WIFSIGNALED(status)) 333 log_warnx("%s terminated; signal %d", 334 (pid == resolver_pid) ? "resolver" : 335 "frontend", WTERMSIG(status)); 336 } while (pid != -1 || (pid == -1 && errno == EINTR)); 337 338 free(iev_frontend); 339 free(iev_resolver); 340 341 log_info("terminating"); 342 exit(0); 343 } 344 345 static pid_t 346 start_child(enum uw_process p, char *argv0, int fd, int debug, int verbose) 347 { 348 char *argv[7]; 349 int argc = 0; 350 pid_t pid; 351 352 switch (pid = fork()) { 353 case -1: 354 fatal("cannot fork"); 355 case 0: 356 break; 357 default: 358 close(fd); 359 return (pid); 360 } 361 362 if (fd != 3) { 363 if (dup2(fd, 3) == -1) 364 fatal("cannot setup imsg fd"); 365 } else if (fcntl(fd, F_SETFD, 0) == -1) 366 fatal("cannot setup imsg fd"); 367 368 argv[argc++] = argv0; 369 switch (p) { 370 case PROC_MAIN: 371 fatalx("Can not start main process"); 372 case PROC_RESOLVER: 373 argv[argc++] = "-E"; 374 break; 375 case PROC_FRONTEND: 376 argv[argc++] = "-F"; 377 break; 378 } 379 if (debug) 380 argv[argc++] = "-d"; 381 if (verbose & OPT_VERBOSE) 382 argv[argc++] = "-v"; 383 if (verbose & OPT_VERBOSE2) 384 argv[argc++] = "-v"; 385 if (verbose & OPT_VERBOSE3) 386 argv[argc++] = "-v"; 387 argv[argc++] = NULL; 388 389 execvp(argv0, argv); 390 fatal("execvp"); 391 } 392 393 void 394 main_dispatch_frontend(int fd, short event, void *bula) 395 { 396 struct imsgev *iev = bula; 397 struct imsgbuf *ibuf; 398 struct imsg imsg; 399 ssize_t n; 400 int shut = 0, verbose; 401 402 ibuf = &iev->ibuf; 403 404 if (event & EV_READ) { 405 if ((n = imsgbuf_read(ibuf)) == -1) 406 fatal("imsgbuf_read error"); 407 if (n == 0) /* Connection closed. */ 408 shut = 1; 409 } 410 if (event & EV_WRITE) { 411 if (imsgbuf_write(ibuf) == -1) { 412 if (errno == EPIPE) /* Connection closed. */ 413 shut = 1; 414 else 415 fatal("imsgbuf_write"); 416 } 417 } 418 419 for (;;) { 420 if ((n = imsg_get(ibuf, &imsg)) == -1) 421 fatal("imsg_get"); 422 if (n == 0) /* No more messages. */ 423 break; 424 425 switch (imsg.hdr.type) { 426 case IMSG_STARTUP_DONE: 427 solicit_dns_proposals(); 428 break; 429 case IMSG_CTL_RELOAD: 430 if (main_reload() == -1) 431 log_warnx("configuration reload failed"); 432 else 433 log_warnx("configuration reloaded"); 434 break; 435 case IMSG_CTL_LOG_VERBOSE: 436 if (IMSG_DATA_SIZE(imsg) != sizeof(verbose)) 437 fatalx("%s: IMSG_CTL_LOG_VERBOSE wrong length: " 438 "%lu", __func__, IMSG_DATA_SIZE(imsg)); 439 memcpy(&verbose, imsg.data, sizeof(verbose)); 440 log_setverbose(verbose); 441 break; 442 default: 443 log_debug("%s: error handling imsg %d", __func__, 444 imsg.hdr.type); 445 break; 446 } 447 imsg_free(&imsg); 448 } 449 if (!shut) 450 imsg_event_add(iev); 451 else { 452 /* This pipe is dead. Remove its event handler */ 453 event_del(&iev->ev); 454 event_loopexit(NULL); 455 } 456 } 457 458 void 459 main_dispatch_resolver(int fd, short event, void *bula) 460 { 461 struct imsgev *iev = bula; 462 struct imsgbuf *ibuf; 463 struct imsg imsg; 464 ssize_t n; 465 int shut = 0; 466 467 ibuf = &iev->ibuf; 468 469 if (event & EV_READ) { 470 if ((n = imsgbuf_read(ibuf)) == -1) 471 fatal("imsgbuf_read error"); 472 if (n == 0) /* Connection closed. */ 473 shut = 1; 474 } 475 if (event & EV_WRITE) { 476 if (imsgbuf_write(ibuf) == -1) { 477 if (errno == EPIPE) /* Connection closed. */ 478 shut = 1; 479 else 480 fatal("imsgbuf_write"); 481 } 482 } 483 484 for (;;) { 485 if ((n = imsg_get(ibuf, &imsg)) == -1) 486 fatal("imsg_get"); 487 if (n == 0) /* No more messages. */ 488 break; 489 490 switch (imsg.hdr.type) { 491 default: 492 log_debug("%s: error handling imsg %d", __func__, 493 imsg.hdr.type); 494 break; 495 } 496 imsg_free(&imsg); 497 } 498 if (!shut) 499 imsg_event_add(iev); 500 else { 501 /* This pipe is dead. Remove its event handler. */ 502 event_del(&iev->ev); 503 event_loopexit(NULL); 504 } 505 } 506 507 void 508 main_imsg_compose_frontend(int type, pid_t pid, void *data, uint16_t datalen) 509 { 510 if (iev_frontend) 511 imsg_compose_event(iev_frontend, type, 0, pid, -1, data, 512 datalen); 513 } 514 515 void 516 main_imsg_compose_frontend_fd(int type, pid_t pid, int fd) 517 { 518 if (iev_frontend) 519 imsg_compose_event(iev_frontend, type, 0, pid, fd, NULL, 0); 520 } 521 522 void 523 main_imsg_compose_resolver(int type, pid_t pid, void *data, uint16_t datalen) 524 { 525 if (iev_resolver) 526 imsg_compose_event(iev_resolver, type, 0, pid, -1, data, 527 datalen); 528 } 529 530 void 531 imsg_event_add(struct imsgev *iev) 532 { 533 iev->events = EV_READ; 534 if (imsgbuf_queuelen(&iev->ibuf) > 0) 535 iev->events |= EV_WRITE; 536 537 event_del(&iev->ev); 538 event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev); 539 event_add(&iev->ev, NULL); 540 } 541 542 int 543 imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid, 544 pid_t pid, int fd, void *data, uint16_t datalen) 545 { 546 int ret; 547 548 if ((ret = imsg_compose(&iev->ibuf, type, peerid, pid, fd, data, 549 datalen)) != -1) 550 imsg_event_add(iev); 551 552 return (ret); 553 } 554 555 static int 556 main_imsg_send_ipc_sockets(struct imsgbuf *frontend_buf, 557 struct imsgbuf *resolver_buf) 558 { 559 int pipe_frontend2resolver[2]; 560 561 if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 562 PF_UNSPEC, pipe_frontend2resolver) == -1) 563 return (-1); 564 565 if (imsg_compose(frontend_buf, IMSG_SOCKET_IPC_RESOLVER, 0, 0, 566 pipe_frontend2resolver[0], NULL, 0) == -1) 567 return (-1); 568 if (imsg_compose(resolver_buf, IMSG_SOCKET_IPC_FRONTEND, 0, 0, 569 pipe_frontend2resolver[1], NULL, 0) == -1) 570 return (-1); 571 572 return (0); 573 } 574 575 int 576 main_reload(void) 577 { 578 struct uw_conf *xconf; 579 580 if ((xconf = parse_config(conffile)) == NULL) 581 return (-1); 582 583 if (main_imsg_send_config(xconf) == -1) 584 return (-1); 585 586 merge_config(main_conf, xconf); 587 588 if (main_conf->blocklist_file != NULL) 589 send_blocklist_fd(); 590 591 return (0); 592 } 593 594 int 595 main_imsg_send_config(struct uw_conf *xconf) 596 { 597 struct uw_forwarder *uw_forwarder; 598 struct force_tree_entry *force_entry; 599 600 /* Send fixed part of config to children. */ 601 if (main_sendall(IMSG_RECONF_CONF, xconf, sizeof(*xconf)) == -1) 602 return (-1); 603 604 if (xconf->blocklist_file != NULL) { 605 if (main_sendall(IMSG_RECONF_BLOCKLIST_FILE, 606 xconf->blocklist_file, strlen(xconf->blocklist_file) + 1) 607 == -1) 608 return (-1); 609 } 610 611 /* send static forwarders to children */ 612 TAILQ_FOREACH(uw_forwarder, &xconf->uw_forwarder_list, entry) { 613 if (main_sendall(IMSG_RECONF_FORWARDER, uw_forwarder, 614 sizeof(*uw_forwarder)) == -1) 615 return (-1); 616 } 617 618 /* send static DoT forwarders to children */ 619 TAILQ_FOREACH(uw_forwarder, &xconf->uw_dot_forwarder_list, 620 entry) { 621 if (main_sendall(IMSG_RECONF_DOT_FORWARDER, uw_forwarder, 622 sizeof(*uw_forwarder)) == -1) 623 return (-1); 624 } 625 RB_FOREACH(force_entry, force_tree, &xconf->force) { 626 if (main_sendall(IMSG_RECONF_FORCE, force_entry, 627 sizeof(*force_entry)) == -1) 628 return (-1); 629 } 630 631 /* Tell children the revised config is now complete. */ 632 if (main_sendall(IMSG_RECONF_END, NULL, 0) == -1) 633 return (-1); 634 635 return (0); 636 } 637 638 int 639 main_sendall(enum imsg_type type, void *buf, uint16_t len) 640 { 641 if (imsg_compose_event(iev_frontend, type, 0, 0, -1, buf, len) == -1) 642 return (-1); 643 if (imsg_compose_event(iev_resolver, type, 0, 0, -1, buf, len) == -1) 644 return (-1); 645 return (0); 646 } 647 648 void 649 merge_config(struct uw_conf *conf, struct uw_conf *xconf) 650 { 651 struct uw_forwarder *uw_forwarder; 652 struct force_tree_entry *n, *nxt; 653 654 /* Remove & discard existing forwarders. */ 655 while ((uw_forwarder = TAILQ_FIRST(&conf->uw_forwarder_list)) != 656 NULL) { 657 TAILQ_REMOVE(&conf->uw_forwarder_list, uw_forwarder, entry); 658 free(uw_forwarder); 659 } 660 while ((uw_forwarder = TAILQ_FIRST(&conf->uw_dot_forwarder_list)) != 661 NULL) { 662 TAILQ_REMOVE(&conf->uw_dot_forwarder_list, uw_forwarder, entry); 663 free(uw_forwarder); 664 } 665 666 /* Remove & discard existing force tree. */ 667 RB_FOREACH_SAFE(n, force_tree, &conf->force, nxt) { 668 RB_REMOVE(force_tree, &conf->force, n); 669 free(n); 670 } 671 672 memcpy(&conf->enabled_resolvers, &xconf->enabled_resolvers, 673 sizeof(conf->enabled_resolvers)); 674 675 memcpy(&conf->res_pref, &xconf->res_pref, 676 sizeof(conf->res_pref)); 677 678 free(conf->blocklist_file); 679 conf->blocklist_file = xconf->blocklist_file; 680 conf->blocklist_log = xconf->blocklist_log; 681 682 /* Add new forwarders. */ 683 TAILQ_CONCAT(&conf->uw_forwarder_list, &xconf->uw_forwarder_list, 684 entry); 685 TAILQ_CONCAT(&conf->uw_dot_forwarder_list, 686 &xconf->uw_dot_forwarder_list, entry); 687 688 RB_FOREACH_SAFE(n, force_tree, &xconf->force, nxt) { 689 RB_REMOVE(force_tree, &xconf->force, n); 690 RB_INSERT(force_tree, &conf->force, n); 691 } 692 693 free(xconf); 694 } 695 696 struct uw_conf * 697 config_new_empty(void) 698 { 699 struct uw_conf *xconf; 700 701 xconf = calloc(1, sizeof(*xconf)); 702 if (xconf == NULL) 703 fatal(NULL); 704 705 TAILQ_INIT(&xconf->uw_forwarder_list); 706 TAILQ_INIT(&xconf->uw_dot_forwarder_list); 707 708 RB_INIT(&xconf->force); 709 710 return (xconf); 711 } 712 713 void 714 config_clear(struct uw_conf *conf) 715 { 716 struct uw_conf *xconf; 717 718 /* Merge current config with an empty config. */ 719 xconf = config_new_empty(); 720 merge_config(conf, xconf); 721 722 free(conf); 723 } 724 725 void 726 open_ports(void) 727 { 728 struct addrinfo hints, *res0; 729 int udp4sock = -1, udp6sock = -1, error, bsize = 65535; 730 int tcp4sock = -1, tcp6sock = -1; 731 int opt = 1; 732 733 memset(&hints, 0, sizeof(hints)); 734 hints.ai_family = AF_INET; 735 hints.ai_socktype = SOCK_DGRAM; 736 hints.ai_flags = AI_NUMERICHOST | AI_PASSIVE; 737 738 error = getaddrinfo("127.0.0.1", "domain", &hints, &res0); 739 if (!error && res0) { 740 if ((udp4sock = socket(res0->ai_family, res0->ai_socktype, 741 res0->ai_protocol)) != -1) { 742 if (setsockopt(udp4sock, SOL_SOCKET, SO_REUSEADDR, 743 &opt, sizeof(opt)) == -1) 744 log_warn("setting SO_REUSEADDR on socket"); 745 if (setsockopt(udp4sock, SOL_SOCKET, SO_SNDBUF, &bsize, 746 sizeof(bsize)) == -1) 747 log_warn("setting SO_SNDBUF on socket"); 748 if (bind(udp4sock, res0->ai_addr, res0->ai_addrlen) 749 == -1) { 750 close(udp4sock); 751 udp4sock = -1; 752 } 753 } 754 } 755 if (res0) 756 freeaddrinfo(res0); 757 758 hints.ai_family = AF_INET6; 759 error = getaddrinfo("::1", "domain", &hints, &res0); 760 if (!error && res0) { 761 if ((udp6sock = socket(res0->ai_family, res0->ai_socktype, 762 res0->ai_protocol)) != -1) { 763 if (setsockopt(udp6sock, SOL_SOCKET, SO_REUSEADDR, 764 &opt, sizeof(opt)) == -1) 765 log_warn("setting SO_REUSEADDR on socket"); 766 if (setsockopt(udp6sock, SOL_SOCKET, SO_SNDBUF, &bsize, 767 sizeof(bsize)) == -1) 768 log_warn("setting SO_SNDBUF on socket"); 769 if (bind(udp6sock, res0->ai_addr, res0->ai_addrlen) 770 == -1) { 771 close(udp6sock); 772 udp6sock = -1; 773 } 774 } 775 } 776 if (res0) 777 freeaddrinfo(res0); 778 779 hints.ai_family = AF_INET; 780 hints.ai_socktype = SOCK_STREAM; 781 782 error = getaddrinfo("127.0.0.1", "domain", &hints, &res0); 783 if (!error && res0) { 784 if ((tcp4sock = socket(res0->ai_family, 785 res0->ai_socktype | SOCK_NONBLOCK, 786 res0->ai_protocol)) != -1) { 787 if (setsockopt(tcp4sock, SOL_SOCKET, SO_REUSEADDR, 788 &opt, sizeof(opt)) == -1) 789 log_warn("setting SO_REUSEADDR on socket"); 790 if (setsockopt(tcp4sock, SOL_SOCKET, SO_SNDBUF, &bsize, 791 sizeof(bsize)) == -1) 792 log_warn("setting SO_SNDBUF on socket"); 793 if (bind(tcp4sock, res0->ai_addr, res0->ai_addrlen) 794 == -1) { 795 close(tcp4sock); 796 tcp4sock = -1; 797 } 798 if (listen(tcp4sock, 5) == -1) { 799 close(tcp4sock); 800 tcp4sock = -1; 801 } 802 } 803 } 804 if (res0) 805 freeaddrinfo(res0); 806 807 hints.ai_family = AF_INET6; 808 error = getaddrinfo("::1", "domain", &hints, &res0); 809 if (!error && res0) { 810 if ((tcp6sock = socket(res0->ai_family, 811 res0->ai_socktype | SOCK_NONBLOCK, 812 res0->ai_protocol)) != -1) { 813 if (setsockopt(tcp6sock, SOL_SOCKET, SO_REUSEADDR, 814 &opt, sizeof(opt)) == -1) 815 log_warn("setting SO_REUSEADDR on socket"); 816 if (setsockopt(tcp6sock, SOL_SOCKET, SO_SNDBUF, &bsize, 817 sizeof(bsize)) == -1) 818 log_warn("setting SO_SNDBUF on socket"); 819 if (bind(tcp6sock, res0->ai_addr, res0->ai_addrlen) 820 == -1) { 821 close(tcp6sock); 822 tcp6sock = -1; 823 } 824 if (listen(tcp6sock, 5) == -1) { 825 close(tcp6sock); 826 tcp6sock = -1; 827 } 828 } 829 } 830 if (res0) 831 freeaddrinfo(res0); 832 833 if ((udp4sock == -1 || tcp4sock == -1) && (udp6sock == -1 || 834 tcp6sock == -1)) 835 fatalx("could not bind to 127.0.0.1 or ::1 on port 53"); 836 837 if (udp4sock != -1) 838 main_imsg_compose_frontend_fd(IMSG_UDP4SOCK, 0, udp4sock); 839 if (udp6sock != -1) 840 main_imsg_compose_frontend_fd(IMSG_UDP6SOCK, 0, udp6sock); 841 if (tcp4sock != -1) 842 main_imsg_compose_frontend_fd(IMSG_TCP4SOCK, 0, tcp4sock); 843 if (tcp6sock != -1) 844 main_imsg_compose_frontend_fd(IMSG_TCP6SOCK, 0, tcp6sock); 845 } 846 847 void 848 solicit_dns_proposals(void) 849 { 850 struct rt_msghdr rtm; 851 struct iovec iov[1]; 852 int iovcnt = 0; 853 854 memset(&rtm, 0, sizeof(rtm)); 855 856 rtm.rtm_version = RTM_VERSION; 857 rtm.rtm_type = RTM_PROPOSAL; 858 rtm.rtm_msglen = sizeof(rtm); 859 rtm.rtm_tableid = 0; 860 rtm.rtm_index = 0; 861 rtm.rtm_seq = arc4random(); 862 rtm.rtm_priority = RTP_PROPOSAL_SOLICIT; 863 864 iov[iovcnt].iov_base = &rtm; 865 iov[iovcnt++].iov_len = sizeof(rtm); 866 867 if (writev(routesock, iov, iovcnt) == -1) 868 log_warn("failed to send solicitation"); 869 } 870 871 void 872 send_blocklist_fd(void) 873 { 874 int bl_fd; 875 876 if ((bl_fd = open(main_conf->blocklist_file, O_RDONLY)) != -1) 877 main_imsg_compose_frontend_fd(IMSG_BLFD, 0, bl_fd); 878 else 879 log_warn("%s", main_conf->blocklist_file); 880 } 881 882 void 883 imsg_receive_config(struct imsg *imsg, struct uw_conf **xconf) 884 { 885 struct uw_conf *nconf; 886 struct uw_forwarder *uw_forwarder; 887 struct force_tree_entry *force_entry; 888 889 nconf = *xconf; 890 891 switch (imsg->hdr.type) { 892 case IMSG_RECONF_CONF: 893 if (nconf != NULL) 894 fatalx("%s: IMSG_RECONF_CONF already in " 895 "progress", __func__); 896 if (IMSG_DATA_SIZE(*imsg) != sizeof(struct uw_conf)) 897 fatalx("%s: IMSG_RECONF_CONF wrong length: %lu", 898 __func__, IMSG_DATA_SIZE(*imsg)); 899 if ((*xconf = malloc(sizeof(struct uw_conf))) == NULL) 900 fatal(NULL); 901 nconf = *xconf; 902 memcpy(nconf, imsg->data, sizeof(struct uw_conf)); 903 TAILQ_INIT(&nconf->uw_forwarder_list); 904 TAILQ_INIT(&nconf->uw_dot_forwarder_list); 905 RB_INIT(&nconf->force); 906 break; 907 case IMSG_RECONF_BLOCKLIST_FILE: 908 if (((char *)imsg->data)[IMSG_DATA_SIZE(*imsg) - 1] != '\0') 909 fatalx("Invalid blocklist file"); 910 if ((nconf->blocklist_file = strdup(imsg->data)) == 911 NULL) 912 fatal("%s: strdup", __func__); 913 break; 914 case IMSG_RECONF_FORWARDER: 915 if (IMSG_DATA_SIZE(*imsg) != sizeof(struct uw_forwarder)) 916 fatalx("%s: IMSG_RECONF_FORWARDER wrong length:" 917 " %lu", __func__, IMSG_DATA_SIZE(*imsg)); 918 if ((uw_forwarder = malloc(sizeof(struct 919 uw_forwarder))) == NULL) 920 fatal(NULL); 921 memcpy(uw_forwarder, imsg->data, sizeof(struct 922 uw_forwarder)); 923 TAILQ_INSERT_TAIL(&nconf->uw_forwarder_list, 924 uw_forwarder, entry); 925 break; 926 case IMSG_RECONF_DOT_FORWARDER: 927 if (IMSG_DATA_SIZE(*imsg) != sizeof(struct uw_forwarder)) 928 fatalx("%s: IMSG_RECONF_DOT_FORWARDER wrong " 929 "length: %lu", __func__, 930 IMSG_DATA_SIZE(*imsg)); 931 if ((uw_forwarder = malloc(sizeof(struct 932 uw_forwarder))) == NULL) 933 fatal(NULL); 934 memcpy(uw_forwarder, imsg->data, sizeof(struct 935 uw_forwarder)); 936 TAILQ_INSERT_TAIL(&nconf->uw_dot_forwarder_list, 937 uw_forwarder, entry); 938 break; 939 case IMSG_RECONF_FORCE: 940 if (IMSG_DATA_SIZE(*imsg) != sizeof(struct force_tree_entry)) 941 fatalx("%s: IMSG_RECONF_FORCE wrong " 942 "length: %lu", __func__, 943 IMSG_DATA_SIZE(*imsg)); 944 if ((force_entry = malloc(sizeof(struct 945 force_tree_entry))) == NULL) 946 fatal(NULL); 947 memcpy(force_entry, imsg->data, sizeof(struct 948 force_tree_entry)); 949 if (RB_INSERT(force_tree, &nconf->force, force_entry) != NULL) { 950 free(force_entry); 951 fatalx("%s: IMSG_RECONF_FORCE duplicate entry", 952 __func__); 953 } 954 break; 955 default: 956 log_debug("%s: error handling imsg %d", __func__, 957 imsg->hdr.type); 958 break; 959 } 960 } 961