1 /*- 2 * Copyright (c) 2009-2010 The FreeBSD Foundation 3 * Copyright (c) 2010 Pawel Jakub Dawidek <pjd@FreeBSD.org> 4 * All rights reserved. 5 * 6 * This software was developed by Pawel Jakub Dawidek under sponsorship from 7 * the FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/linker.h> 36 #include <sys/module.h> 37 #include <sys/wait.h> 38 39 #include <assert.h> 40 #include <err.h> 41 #include <errno.h> 42 #include <libutil.h> 43 #include <signal.h> 44 #include <stdbool.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <sysexits.h> 49 #include <unistd.h> 50 51 #include <activemap.h> 52 #include <pjdlog.h> 53 54 #include "control.h" 55 #include "hast.h" 56 #include "hast_proto.h" 57 #include "hastd.h" 58 #include "subr.h" 59 60 /* Path to configuration file. */ 61 const char *cfgpath = HAST_CONFIG; 62 /* Hastd configuration. */ 63 static struct hastd_config *cfg; 64 /* Was SIGCHLD signal received? */ 65 bool sigchld_received = false; 66 /* Was SIGHUP signal received? */ 67 bool sighup_received = false; 68 /* Was SIGINT or SIGTERM signal received? */ 69 bool sigexit_received = false; 70 /* PID file handle. */ 71 struct pidfh *pfh; 72 73 static void 74 usage(void) 75 { 76 77 errx(EX_USAGE, "[-dFh] [-c config] [-P pidfile]"); 78 } 79 80 static void 81 sighandler(int sig) 82 { 83 84 switch (sig) { 85 case SIGINT: 86 case SIGTERM: 87 sigexit_received = true; 88 break; 89 case SIGCHLD: 90 sigchld_received = true; 91 break; 92 case SIGHUP: 93 sighup_received = true; 94 break; 95 default: 96 assert(!"invalid condition"); 97 } 98 } 99 100 static void 101 g_gate_load(void) 102 { 103 104 if (modfind("g_gate") == -1) { 105 /* Not present in kernel, try loading it. */ 106 if (kldload("geom_gate") == -1 || modfind("g_gate") == -1) { 107 if (errno != EEXIST) { 108 pjdlog_exit(EX_OSERR, 109 "Unable to load geom_gate module"); 110 } 111 } 112 } 113 } 114 115 static void 116 child_exit_log(unsigned int pid, int status) 117 { 118 119 if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { 120 pjdlog_debug(1, "Worker process exited gracefully (pid=%u).", 121 pid); 122 } else if (WIFSIGNALED(status)) { 123 pjdlog_error("Worker process killed (pid=%u, signal=%d).", 124 pid, WTERMSIG(status)); 125 } else { 126 pjdlog_error("Worker process exited ungracefully (pid=%u, exitcode=%d).", 127 pid, WIFEXITED(status) ? WEXITSTATUS(status) : -1); 128 } 129 } 130 131 static void 132 child_exit(void) 133 { 134 struct hast_resource *res; 135 int status; 136 pid_t pid; 137 138 while ((pid = wait3(&status, WNOHANG, NULL)) > 0) { 139 /* Find resource related to the process that just exited. */ 140 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) { 141 if (pid == res->hr_workerpid) 142 break; 143 } 144 if (res == NULL) { 145 /* 146 * This can happen when new connection arrives and we 147 * cancel child responsible for the old one. 148 */ 149 continue; 150 } 151 pjdlog_prefix_set("[%s] (%s) ", res->hr_name, 152 role2str(res->hr_role)); 153 child_exit_log(pid, status); 154 proto_close(res->hr_ctrl); 155 res->hr_workerpid = 0; 156 if (res->hr_role == HAST_ROLE_PRIMARY) { 157 /* 158 * Restart child process if it was killed by signal 159 * or exited because of temporary problem. 160 */ 161 if (WIFSIGNALED(status) || 162 (WIFEXITED(status) && 163 WEXITSTATUS(status) == EX_TEMPFAIL)) { 164 sleep(1); 165 pjdlog_info("Restarting worker process."); 166 hastd_primary(res); 167 } else { 168 res->hr_role = HAST_ROLE_INIT; 169 pjdlog_info("Changing resource role back to %s.", 170 role2str(res->hr_role)); 171 } 172 } 173 pjdlog_prefix_set("%s", ""); 174 } 175 } 176 177 static bool 178 resource_needs_restart(const struct hast_resource *res0, 179 const struct hast_resource *res1) 180 { 181 182 assert(strcmp(res0->hr_name, res1->hr_name) == 0); 183 184 if (strcmp(res0->hr_provname, res1->hr_provname) != 0) 185 return (true); 186 if (strcmp(res0->hr_localpath, res1->hr_localpath) != 0) 187 return (true); 188 if (res0->hr_role == HAST_ROLE_INIT || 189 res0->hr_role == HAST_ROLE_SECONDARY) { 190 if (strcmp(res0->hr_remoteaddr, res1->hr_remoteaddr) != 0) 191 return (true); 192 if (res0->hr_replication != res1->hr_replication) 193 return (true); 194 if (res0->hr_timeout != res1->hr_timeout) 195 return (true); 196 if (strcmp(res0->hr_exec, res1->hr_exec) != 0) 197 return (true); 198 } 199 return (false); 200 } 201 202 static bool 203 resource_needs_reload(const struct hast_resource *res0, 204 const struct hast_resource *res1) 205 { 206 207 assert(strcmp(res0->hr_name, res1->hr_name) == 0); 208 assert(strcmp(res0->hr_provname, res1->hr_provname) == 0); 209 assert(strcmp(res0->hr_localpath, res1->hr_localpath) == 0); 210 211 if (res0->hr_role != HAST_ROLE_PRIMARY) 212 return (false); 213 214 if (strcmp(res0->hr_remoteaddr, res1->hr_remoteaddr) != 0) 215 return (true); 216 if (res0->hr_replication != res1->hr_replication) 217 return (true); 218 if (res0->hr_timeout != res1->hr_timeout) 219 return (true); 220 if (strcmp(res0->hr_exec, res1->hr_exec) != 0) 221 return (true); 222 return (false); 223 } 224 225 static void 226 hastd_reload(void) 227 { 228 struct hastd_config *newcfg; 229 struct hast_resource *nres, *cres, *tres; 230 uint8_t role; 231 232 pjdlog_info("Reloading configuration..."); 233 234 newcfg = yy_config_parse(cfgpath, false); 235 if (newcfg == NULL) 236 goto failed; 237 238 /* 239 * Check if control address has changed. 240 */ 241 if (strcmp(cfg->hc_controladdr, newcfg->hc_controladdr) != 0) { 242 if (proto_server(newcfg->hc_controladdr, 243 &newcfg->hc_controlconn) < 0) { 244 pjdlog_errno(LOG_ERR, 245 "Unable to listen on control address %s", 246 newcfg->hc_controladdr); 247 goto failed; 248 } 249 } 250 /* 251 * Check if listen address has changed. 252 */ 253 if (strcmp(cfg->hc_listenaddr, newcfg->hc_listenaddr) != 0) { 254 if (proto_server(newcfg->hc_listenaddr, 255 &newcfg->hc_listenconn) < 0) { 256 pjdlog_errno(LOG_ERR, "Unable to listen on address %s", 257 newcfg->hc_listenaddr); 258 goto failed; 259 } 260 } 261 /* 262 * Only when both control and listen sockets are successfully 263 * initialized switch them to new configuration. 264 */ 265 if (newcfg->hc_controlconn != NULL) { 266 pjdlog_info("Control socket changed from %s to %s.", 267 cfg->hc_controladdr, newcfg->hc_controladdr); 268 proto_close(cfg->hc_controlconn); 269 cfg->hc_controlconn = newcfg->hc_controlconn; 270 newcfg->hc_controlconn = NULL; 271 strlcpy(cfg->hc_controladdr, newcfg->hc_controladdr, 272 sizeof(cfg->hc_controladdr)); 273 } 274 if (newcfg->hc_listenconn != NULL) { 275 pjdlog_info("Listen socket changed from %s to %s.", 276 cfg->hc_listenaddr, newcfg->hc_listenaddr); 277 proto_close(cfg->hc_listenconn); 278 cfg->hc_listenconn = newcfg->hc_listenconn; 279 newcfg->hc_listenconn = NULL; 280 strlcpy(cfg->hc_listenaddr, newcfg->hc_listenaddr, 281 sizeof(cfg->hc_listenaddr)); 282 } 283 284 /* 285 * Stop and remove resources that were removed from the configuration. 286 */ 287 TAILQ_FOREACH_SAFE(cres, &cfg->hc_resources, hr_next, tres) { 288 TAILQ_FOREACH(nres, &newcfg->hc_resources, hr_next) { 289 if (strcmp(cres->hr_name, nres->hr_name) == 0) 290 break; 291 } 292 if (nres == NULL) { 293 control_set_role(cres, HAST_ROLE_INIT); 294 TAILQ_REMOVE(&cfg->hc_resources, cres, hr_next); 295 pjdlog_info("Resource %s removed.", cres->hr_name); 296 free(cres); 297 } 298 } 299 /* 300 * Move new resources to the current configuration. 301 */ 302 TAILQ_FOREACH_SAFE(nres, &newcfg->hc_resources, hr_next, tres) { 303 TAILQ_FOREACH(cres, &cfg->hc_resources, hr_next) { 304 if (strcmp(cres->hr_name, nres->hr_name) == 0) 305 break; 306 } 307 if (cres == NULL) { 308 TAILQ_REMOVE(&newcfg->hc_resources, nres, hr_next); 309 TAILQ_INSERT_TAIL(&cfg->hc_resources, nres, hr_next); 310 pjdlog_info("Resource %s added.", nres->hr_name); 311 } 312 } 313 /* 314 * Deal with modified resources. 315 * Depending on what has changed exactly we might want to perform 316 * different actions. 317 * 318 * We do full resource restart in the following situations: 319 * Resource role is INIT or SECONDARY. 320 * Resource role is PRIMARY and path to local component or provider 321 * name has changed. 322 * In case of PRIMARY, the worker process will be killed and restarted, 323 * which also means removing /dev/hast/<name> provider and 324 * recreating it. 325 * 326 * We do just reload (send SIGHUP to worker process) if we act as 327 * PRIMARY, but only remote address, replication mode and timeout 328 * has changed. For those, there is no need to restart worker process. 329 * If PRIMARY receives SIGHUP, it will reconnect if remote address or 330 * replication mode has changed or simply set new timeout if only 331 * timeout has changed. 332 */ 333 TAILQ_FOREACH_SAFE(nres, &newcfg->hc_resources, hr_next, tres) { 334 TAILQ_FOREACH(cres, &cfg->hc_resources, hr_next) { 335 if (strcmp(cres->hr_name, nres->hr_name) == 0) 336 break; 337 } 338 assert(cres != NULL); 339 if (resource_needs_restart(cres, nres)) { 340 pjdlog_info("Resource %s configuration was modified, restarting it.", 341 cres->hr_name); 342 role = cres->hr_role; 343 control_set_role(cres, HAST_ROLE_INIT); 344 TAILQ_REMOVE(&cfg->hc_resources, cres, hr_next); 345 free(cres); 346 TAILQ_REMOVE(&newcfg->hc_resources, nres, hr_next); 347 TAILQ_INSERT_TAIL(&cfg->hc_resources, nres, hr_next); 348 control_set_role(nres, role); 349 } else if (resource_needs_reload(cres, nres)) { 350 pjdlog_info("Resource %s configuration was modified, reloading it.", 351 cres->hr_name); 352 strlcpy(cres->hr_remoteaddr, nres->hr_remoteaddr, 353 sizeof(cres->hr_remoteaddr)); 354 cres->hr_replication = nres->hr_replication; 355 cres->hr_timeout = nres->hr_timeout; 356 if (cres->hr_workerpid != 0) { 357 if (kill(cres->hr_workerpid, SIGHUP) < 0) { 358 pjdlog_errno(LOG_WARNING, 359 "Unable to send SIGHUP to worker process %u", 360 (unsigned int)cres->hr_workerpid); 361 } 362 } 363 } 364 } 365 366 yy_config_free(newcfg); 367 pjdlog_info("Configuration reloaded successfully."); 368 return; 369 failed: 370 if (newcfg != NULL) { 371 if (newcfg->hc_controlconn != NULL) 372 proto_close(newcfg->hc_controlconn); 373 if (newcfg->hc_listenconn != NULL) 374 proto_close(newcfg->hc_listenconn); 375 yy_config_free(newcfg); 376 } 377 pjdlog_warning("Configuration not reloaded."); 378 } 379 380 static void 381 terminate_workers(void) 382 { 383 struct hast_resource *res; 384 385 pjdlog_info("Termination signal received, exiting."); 386 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) { 387 if (res->hr_workerpid == 0) 388 continue; 389 pjdlog_info("Terminating worker process (resource=%s, role=%s, pid=%u).", 390 res->hr_name, role2str(res->hr_role), res->hr_workerpid); 391 if (kill(res->hr_workerpid, SIGTERM) == 0) 392 continue; 393 pjdlog_errno(LOG_WARNING, 394 "Unable to send signal to worker process (resource=%s, role=%s, pid=%u).", 395 res->hr_name, role2str(res->hr_role), res->hr_workerpid); 396 } 397 } 398 399 static void 400 listen_accept(void) 401 { 402 struct hast_resource *res; 403 struct proto_conn *conn; 404 struct nv *nvin, *nvout, *nverr; 405 const char *resname; 406 const unsigned char *token; 407 char laddr[256], raddr[256]; 408 size_t size; 409 pid_t pid; 410 int status; 411 412 proto_local_address(cfg->hc_listenconn, laddr, sizeof(laddr)); 413 pjdlog_debug(1, "Accepting connection to %s.", laddr); 414 415 if (proto_accept(cfg->hc_listenconn, &conn) < 0) { 416 pjdlog_errno(LOG_ERR, "Unable to accept connection %s", laddr); 417 return; 418 } 419 420 proto_local_address(conn, laddr, sizeof(laddr)); 421 proto_remote_address(conn, raddr, sizeof(raddr)); 422 pjdlog_info("Connection from %s to %s.", raddr, laddr); 423 424 /* Error in setting timeout is not critical, but why should it fail? */ 425 if (proto_timeout(conn, HAST_TIMEOUT) < 0) 426 pjdlog_errno(LOG_WARNING, "Unable to set connection timeout"); 427 428 nvin = nvout = nverr = NULL; 429 430 /* 431 * Before receiving any data see if remote host have access to any 432 * resource. 433 */ 434 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) { 435 if (proto_address_match(conn, res->hr_remoteaddr)) 436 break; 437 } 438 if (res == NULL) { 439 pjdlog_error("Client %s isn't known.", raddr); 440 goto close; 441 } 442 /* Ok, remote host can access at least one resource. */ 443 444 if (hast_proto_recv_hdr(conn, &nvin) < 0) { 445 pjdlog_errno(LOG_ERR, "Unable to receive header from %s", 446 raddr); 447 goto close; 448 } 449 450 resname = nv_get_string(nvin, "resource"); 451 if (resname == NULL) { 452 pjdlog_error("No 'resource' field in the header received from %s.", 453 raddr); 454 goto close; 455 } 456 pjdlog_debug(2, "%s: resource=%s", raddr, resname); 457 token = nv_get_uint8_array(nvin, &size, "token"); 458 /* 459 * NULL token means that this is first conection. 460 */ 461 if (token != NULL && size != sizeof(res->hr_token)) { 462 pjdlog_error("Received token of invalid size from %s (expected %zu, got %zu).", 463 raddr, sizeof(res->hr_token), size); 464 goto close; 465 } 466 467 /* 468 * From now on we want to send errors to the remote node. 469 */ 470 nverr = nv_alloc(); 471 472 /* Find resource related to this connection. */ 473 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) { 474 if (strcmp(resname, res->hr_name) == 0) 475 break; 476 } 477 /* Have we found the resource? */ 478 if (res == NULL) { 479 pjdlog_error("No resource '%s' as requested by %s.", 480 resname, raddr); 481 nv_add_stringf(nverr, "errmsg", "Resource not configured."); 482 goto fail; 483 } 484 485 /* Now that we know resource name setup log prefix. */ 486 pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role)); 487 488 /* Does the remote host have access to this resource? */ 489 if (!proto_address_match(conn, res->hr_remoteaddr)) { 490 pjdlog_error("Client %s has no access to the resource.", raddr); 491 nv_add_stringf(nverr, "errmsg", "No access to the resource."); 492 goto fail; 493 } 494 /* Is the resource marked as secondary? */ 495 if (res->hr_role != HAST_ROLE_SECONDARY) { 496 pjdlog_error("We act as %s for the resource and not as %s as requested by %s.", 497 role2str(res->hr_role), role2str(HAST_ROLE_SECONDARY), 498 raddr); 499 nv_add_stringf(nverr, "errmsg", 500 "Remote node acts as %s for the resource and not as %s.", 501 role2str(res->hr_role), role2str(HAST_ROLE_SECONDARY)); 502 goto fail; 503 } 504 /* Does token (if exists) match? */ 505 if (token != NULL && memcmp(token, res->hr_token, 506 sizeof(res->hr_token)) != 0) { 507 pjdlog_error("Token received from %s doesn't match.", raddr); 508 nv_add_stringf(nverr, "errmsg", "Token doesn't match."); 509 goto fail; 510 } 511 /* 512 * If there is no token, but we have half-open connection 513 * (only remotein) or full connection (worker process is running) 514 * we have to cancel those and accept the new connection. 515 */ 516 if (token == NULL) { 517 assert(res->hr_remoteout == NULL); 518 pjdlog_debug(1, "Initial connection from %s.", raddr); 519 if (res->hr_workerpid != 0) { 520 assert(res->hr_remotein == NULL); 521 pjdlog_debug(1, 522 "Worker process exists (pid=%u), stopping it.", 523 (unsigned int)res->hr_workerpid); 524 /* Stop child process. */ 525 if (kill(res->hr_workerpid, SIGINT) < 0) { 526 pjdlog_errno(LOG_ERR, 527 "Unable to stop worker process (pid=%u)", 528 (unsigned int)res->hr_workerpid); 529 /* 530 * Other than logging the problem we 531 * ignore it - nothing smart to do. 532 */ 533 } 534 /* Wait for it to exit. */ 535 else if ((pid = waitpid(res->hr_workerpid, 536 &status, 0)) != res->hr_workerpid) { 537 /* We can only log the problem. */ 538 pjdlog_errno(LOG_ERR, 539 "Waiting for worker process (pid=%u) failed", 540 (unsigned int)res->hr_workerpid); 541 } else { 542 child_exit_log(res->hr_workerpid, status); 543 } 544 res->hr_workerpid = 0; 545 } else if (res->hr_remotein != NULL) { 546 char oaddr[256]; 547 548 proto_remote_address(conn, oaddr, sizeof(oaddr)); 549 pjdlog_debug(1, 550 "Canceling half-open connection from %s on connection from %s.", 551 oaddr, raddr); 552 proto_close(res->hr_remotein); 553 res->hr_remotein = NULL; 554 } 555 } 556 557 /* 558 * Checks and cleanups are done. 559 */ 560 561 if (token == NULL) { 562 arc4random_buf(res->hr_token, sizeof(res->hr_token)); 563 nvout = nv_alloc(); 564 nv_add_uint8_array(nvout, res->hr_token, 565 sizeof(res->hr_token), "token"); 566 if (nv_error(nvout) != 0) { 567 pjdlog_common(LOG_ERR, 0, nv_error(nvout), 568 "Unable to prepare return header for %s", raddr); 569 nv_add_stringf(nverr, "errmsg", 570 "Remote node was unable to prepare return header: %s.", 571 strerror(nv_error(nvout))); 572 goto fail; 573 } 574 if (hast_proto_send(NULL, conn, nvout, NULL, 0) < 0) { 575 int error = errno; 576 577 pjdlog_errno(LOG_ERR, "Unable to send response to %s", 578 raddr); 579 nv_add_stringf(nverr, "errmsg", 580 "Remote node was unable to send response: %s.", 581 strerror(error)); 582 goto fail; 583 } 584 res->hr_remotein = conn; 585 pjdlog_debug(1, "Incoming connection from %s configured.", 586 raddr); 587 } else { 588 res->hr_remoteout = conn; 589 pjdlog_debug(1, "Outgoing connection to %s configured.", raddr); 590 hastd_secondary(res, nvin); 591 } 592 nv_free(nvin); 593 nv_free(nvout); 594 nv_free(nverr); 595 pjdlog_prefix_set("%s", ""); 596 return; 597 fail: 598 if (nv_error(nverr) != 0) { 599 pjdlog_common(LOG_ERR, 0, nv_error(nverr), 600 "Unable to prepare error header for %s", raddr); 601 goto close; 602 } 603 if (hast_proto_send(NULL, conn, nverr, NULL, 0) < 0) { 604 pjdlog_errno(LOG_ERR, "Unable to send error to %s", raddr); 605 goto close; 606 } 607 close: 608 if (nvin != NULL) 609 nv_free(nvin); 610 if (nvout != NULL) 611 nv_free(nvout); 612 if (nverr != NULL) 613 nv_free(nverr); 614 proto_close(conn); 615 pjdlog_prefix_set("%s", ""); 616 } 617 618 static void 619 main_loop(void) 620 { 621 fd_set rfds, wfds; 622 int cfd, lfd, maxfd, ret; 623 624 for (;;) { 625 if (sigexit_received) { 626 sigexit_received = false; 627 terminate_workers(); 628 exit(EX_OK); 629 } 630 if (sigchld_received) { 631 sigchld_received = false; 632 child_exit(); 633 } 634 if (sighup_received) { 635 sighup_received = false; 636 hastd_reload(); 637 } 638 639 cfd = proto_descriptor(cfg->hc_controlconn); 640 lfd = proto_descriptor(cfg->hc_listenconn); 641 maxfd = cfd > lfd ? cfd : lfd; 642 643 /* Setup descriptors for select(2). */ 644 FD_ZERO(&rfds); 645 FD_SET(cfd, &rfds); 646 FD_SET(lfd, &rfds); 647 FD_ZERO(&wfds); 648 FD_SET(cfd, &wfds); 649 FD_SET(lfd, &wfds); 650 651 ret = select(maxfd + 1, &rfds, &wfds, NULL, NULL); 652 if (ret == -1) { 653 if (errno == EINTR) 654 continue; 655 KEEP_ERRNO((void)pidfile_remove(pfh)); 656 pjdlog_exit(EX_OSERR, "select() failed"); 657 } 658 659 if (FD_ISSET(cfd, &rfds) || FD_ISSET(cfd, &wfds)) 660 control_handle(cfg); 661 if (FD_ISSET(lfd, &rfds) || FD_ISSET(lfd, &wfds)) 662 listen_accept(); 663 } 664 } 665 666 int 667 main(int argc, char *argv[]) 668 { 669 const char *pidfile; 670 pid_t otherpid; 671 bool foreground; 672 int debuglevel; 673 674 g_gate_load(); 675 676 foreground = false; 677 debuglevel = 0; 678 pidfile = HASTD_PIDFILE; 679 680 for (;;) { 681 int ch; 682 683 ch = getopt(argc, argv, "c:dFhP:"); 684 if (ch == -1) 685 break; 686 switch (ch) { 687 case 'c': 688 cfgpath = optarg; 689 break; 690 case 'd': 691 debuglevel++; 692 break; 693 case 'F': 694 foreground = true; 695 break; 696 case 'P': 697 pidfile = optarg; 698 break; 699 case 'h': 700 default: 701 usage(); 702 } 703 } 704 argc -= optind; 705 argv += optind; 706 707 pjdlog_debug_set(debuglevel); 708 709 pfh = pidfile_open(pidfile, 0600, &otherpid); 710 if (pfh == NULL) { 711 if (errno == EEXIST) { 712 pjdlog_exitx(EX_TEMPFAIL, 713 "Another hastd is already running, pid: %jd.", 714 (intmax_t)otherpid); 715 } 716 /* If we cannot create pidfile from other reasons, only warn. */ 717 pjdlog_errno(LOG_WARNING, "Unable to open or create pidfile"); 718 } 719 720 cfg = yy_config_parse(cfgpath, true); 721 assert(cfg != NULL); 722 723 signal(SIGINT, sighandler); 724 signal(SIGTERM, sighandler); 725 signal(SIGHUP, sighandler); 726 signal(SIGCHLD, sighandler); 727 728 /* Listen on control address. */ 729 if (proto_server(cfg->hc_controladdr, &cfg->hc_controlconn) < 0) { 730 KEEP_ERRNO((void)pidfile_remove(pfh)); 731 pjdlog_exit(EX_OSERR, "Unable to listen on control address %s", 732 cfg->hc_controladdr); 733 } 734 /* Listen for remote connections. */ 735 if (proto_server(cfg->hc_listenaddr, &cfg->hc_listenconn) < 0) { 736 KEEP_ERRNO((void)pidfile_remove(pfh)); 737 pjdlog_exit(EX_OSERR, "Unable to listen on address %s", 738 cfg->hc_listenaddr); 739 } 740 741 if (!foreground) { 742 if (daemon(0, 0) < 0) { 743 KEEP_ERRNO((void)pidfile_remove(pfh)); 744 pjdlog_exit(EX_OSERR, "Unable to daemonize"); 745 } 746 747 /* Start logging to syslog. */ 748 pjdlog_mode_set(PJDLOG_MODE_SYSLOG); 749 750 /* Write PID to a file. */ 751 if (pidfile_write(pfh) < 0) { 752 pjdlog_errno(LOG_WARNING, 753 "Unable to write PID to a file"); 754 } 755 } 756 757 main_loop(); 758 759 exit(0); 760 } 761