hastd.c revision 213428
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: head/sbin/hastd/hastd.c 213428 2010-10-04 21:41:18Z pjd $"); 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 "event.h" 56#include "hast.h" 57#include "hast_proto.h" 58#include "hastd.h" 59#include "hooks.h" 60#include "subr.h" 61 62/* Path to configuration file. */ 63const char *cfgpath = HAST_CONFIG; 64/* Hastd configuration. */ 65static struct hastd_config *cfg; 66/* Was SIGINT or SIGTERM signal received? */ 67bool sigexit_received = false; 68/* PID file handle. */ 69struct pidfh *pfh; 70 71/* How often check for hooks running for too long. */ 72#define REPORT_INTERVAL 10 73 74static void 75usage(void) 76{ 77 78 errx(EX_USAGE, "[-dFh] [-c config] [-P pidfile]"); 79} 80 81static void 82g_gate_load(void) 83{ 84 85 if (modfind("g_gate") == -1) { 86 /* Not present in kernel, try loading it. */ 87 if (kldload("geom_gate") == -1 || modfind("g_gate") == -1) { 88 if (errno != EEXIST) { 89 pjdlog_exit(EX_OSERR, 90 "Unable to load geom_gate module"); 91 } 92 } 93 } 94} 95 96static void 97child_exit_log(unsigned int pid, int status) 98{ 99 100 if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { 101 pjdlog_debug(1, "Worker process exited gracefully (pid=%u).", 102 pid); 103 } else if (WIFSIGNALED(status)) { 104 pjdlog_error("Worker process killed (pid=%u, signal=%d).", 105 pid, WTERMSIG(status)); 106 } else { 107 pjdlog_error("Worker process exited ungracefully (pid=%u, exitcode=%d).", 108 pid, WIFEXITED(status) ? WEXITSTATUS(status) : -1); 109 } 110} 111 112static void 113child_exit(void) 114{ 115 struct hast_resource *res; 116 int status; 117 pid_t pid; 118 119 while ((pid = wait3(&status, WNOHANG, NULL)) > 0) { 120 /* Find resource related to the process that just exited. */ 121 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) { 122 if (pid == res->hr_workerpid) 123 break; 124 } 125 if (res == NULL) { 126 /* 127 * This can happen when new connection arrives and we 128 * cancel child responsible for the old one or if this 129 * was hook which we executed. 130 */ 131 hook_check_one(pid, status); 132 continue; 133 } 134 pjdlog_prefix_set("[%s] (%s) ", res->hr_name, 135 role2str(res->hr_role)); 136 child_exit_log(pid, status); 137 child_cleanup(res); 138 if (res->hr_role == HAST_ROLE_PRIMARY) { 139 /* 140 * Restart child process if it was killed by signal 141 * or exited because of temporary problem. 142 */ 143 if (WIFSIGNALED(status) || 144 (WIFEXITED(status) && 145 WEXITSTATUS(status) == EX_TEMPFAIL)) { 146 sleep(1); 147 pjdlog_info("Restarting worker process."); 148 hastd_primary(res); 149 } else { 150 res->hr_role = HAST_ROLE_INIT; 151 pjdlog_info("Changing resource role back to %s.", 152 role2str(res->hr_role)); 153 } 154 } 155 pjdlog_prefix_set("%s", ""); 156 } 157} 158 159static bool 160resource_needs_restart(const struct hast_resource *res0, 161 const struct hast_resource *res1) 162{ 163 164 assert(strcmp(res0->hr_name, res1->hr_name) == 0); 165 166 if (strcmp(res0->hr_provname, res1->hr_provname) != 0) 167 return (true); 168 if (strcmp(res0->hr_localpath, res1->hr_localpath) != 0) 169 return (true); 170 if (res0->hr_role == HAST_ROLE_INIT || 171 res0->hr_role == HAST_ROLE_SECONDARY) { 172 if (strcmp(res0->hr_remoteaddr, res1->hr_remoteaddr) != 0) 173 return (true); 174 if (res0->hr_replication != res1->hr_replication) 175 return (true); 176 if (res0->hr_timeout != res1->hr_timeout) 177 return (true); 178 if (strcmp(res0->hr_exec, res1->hr_exec) != 0) 179 return (true); 180 } 181 return (false); 182} 183 184static bool 185resource_needs_reload(const struct hast_resource *res0, 186 const struct hast_resource *res1) 187{ 188 189 assert(strcmp(res0->hr_name, res1->hr_name) == 0); 190 assert(strcmp(res0->hr_provname, res1->hr_provname) == 0); 191 assert(strcmp(res0->hr_localpath, res1->hr_localpath) == 0); 192 193 if (res0->hr_role != HAST_ROLE_PRIMARY) 194 return (false); 195 196 if (strcmp(res0->hr_remoteaddr, res1->hr_remoteaddr) != 0) 197 return (true); 198 if (res0->hr_replication != res1->hr_replication) 199 return (true); 200 if (res0->hr_timeout != res1->hr_timeout) 201 return (true); 202 if (strcmp(res0->hr_exec, res1->hr_exec) != 0) 203 return (true); 204 return (false); 205} 206 207static void 208hastd_reload(void) 209{ 210 struct hastd_config *newcfg; 211 struct hast_resource *nres, *cres, *tres; 212 uint8_t role; 213 214 pjdlog_info("Reloading configuration..."); 215 216 newcfg = yy_config_parse(cfgpath, false); 217 if (newcfg == NULL) 218 goto failed; 219 220 /* 221 * Check if control address has changed. 222 */ 223 if (strcmp(cfg->hc_controladdr, newcfg->hc_controladdr) != 0) { 224 if (proto_server(newcfg->hc_controladdr, 225 &newcfg->hc_controlconn) < 0) { 226 pjdlog_errno(LOG_ERR, 227 "Unable to listen on control address %s", 228 newcfg->hc_controladdr); 229 goto failed; 230 } 231 } 232 /* 233 * Check if listen address has changed. 234 */ 235 if (strcmp(cfg->hc_listenaddr, newcfg->hc_listenaddr) != 0) { 236 if (proto_server(newcfg->hc_listenaddr, 237 &newcfg->hc_listenconn) < 0) { 238 pjdlog_errno(LOG_ERR, "Unable to listen on address %s", 239 newcfg->hc_listenaddr); 240 goto failed; 241 } 242 } 243 /* 244 * Only when both control and listen sockets are successfully 245 * initialized switch them to new configuration. 246 */ 247 if (newcfg->hc_controlconn != NULL) { 248 pjdlog_info("Control socket changed from %s to %s.", 249 cfg->hc_controladdr, newcfg->hc_controladdr); 250 proto_close(cfg->hc_controlconn); 251 cfg->hc_controlconn = newcfg->hc_controlconn; 252 newcfg->hc_controlconn = NULL; 253 strlcpy(cfg->hc_controladdr, newcfg->hc_controladdr, 254 sizeof(cfg->hc_controladdr)); 255 } 256 if (newcfg->hc_listenconn != NULL) { 257 pjdlog_info("Listen socket changed from %s to %s.", 258 cfg->hc_listenaddr, newcfg->hc_listenaddr); 259 proto_close(cfg->hc_listenconn); 260 cfg->hc_listenconn = newcfg->hc_listenconn; 261 newcfg->hc_listenconn = NULL; 262 strlcpy(cfg->hc_listenaddr, newcfg->hc_listenaddr, 263 sizeof(cfg->hc_listenaddr)); 264 } 265 266 /* 267 * Stop and remove resources that were removed from the configuration. 268 */ 269 TAILQ_FOREACH_SAFE(cres, &cfg->hc_resources, hr_next, tres) { 270 TAILQ_FOREACH(nres, &newcfg->hc_resources, hr_next) { 271 if (strcmp(cres->hr_name, nres->hr_name) == 0) 272 break; 273 } 274 if (nres == NULL) { 275 control_set_role(cres, HAST_ROLE_INIT); 276 TAILQ_REMOVE(&cfg->hc_resources, cres, hr_next); 277 pjdlog_info("Resource %s removed.", cres->hr_name); 278 free(cres); 279 } 280 } 281 /* 282 * Move new resources to the current configuration. 283 */ 284 TAILQ_FOREACH_SAFE(nres, &newcfg->hc_resources, hr_next, tres) { 285 TAILQ_FOREACH(cres, &cfg->hc_resources, hr_next) { 286 if (strcmp(cres->hr_name, nres->hr_name) == 0) 287 break; 288 } 289 if (cres == NULL) { 290 TAILQ_REMOVE(&newcfg->hc_resources, nres, hr_next); 291 TAILQ_INSERT_TAIL(&cfg->hc_resources, nres, hr_next); 292 pjdlog_info("Resource %s added.", nres->hr_name); 293 } 294 } 295 /* 296 * Deal with modified resources. 297 * Depending on what has changed exactly we might want to perform 298 * different actions. 299 * 300 * We do full resource restart in the following situations: 301 * Resource role is INIT or SECONDARY. 302 * Resource role is PRIMARY and path to local component or provider 303 * name has changed. 304 * In case of PRIMARY, the worker process will be killed and restarted, 305 * which also means removing /dev/hast/<name> provider and 306 * recreating it. 307 * 308 * We do just reload (send SIGHUP to worker process) if we act as 309 * PRIMARY, but only remote address, replication mode and timeout 310 * has changed. For those, there is no need to restart worker process. 311 * If PRIMARY receives SIGHUP, it will reconnect if remote address or 312 * replication mode has changed or simply set new timeout if only 313 * timeout has changed. 314 */ 315 TAILQ_FOREACH_SAFE(nres, &newcfg->hc_resources, hr_next, tres) { 316 TAILQ_FOREACH(cres, &cfg->hc_resources, hr_next) { 317 if (strcmp(cres->hr_name, nres->hr_name) == 0) 318 break; 319 } 320 assert(cres != NULL); 321 if (resource_needs_restart(cres, nres)) { 322 pjdlog_info("Resource %s configuration was modified, restarting it.", 323 cres->hr_name); 324 role = cres->hr_role; 325 control_set_role(cres, HAST_ROLE_INIT); 326 TAILQ_REMOVE(&cfg->hc_resources, cres, hr_next); 327 free(cres); 328 TAILQ_REMOVE(&newcfg->hc_resources, nres, hr_next); 329 TAILQ_INSERT_TAIL(&cfg->hc_resources, nres, hr_next); 330 control_set_role(nres, role); 331 } else if (resource_needs_reload(cres, nres)) { 332 pjdlog_info("Resource %s configuration was modified, reloading it.", 333 cres->hr_name); 334 strlcpy(cres->hr_remoteaddr, nres->hr_remoteaddr, 335 sizeof(cres->hr_remoteaddr)); 336 cres->hr_replication = nres->hr_replication; 337 cres->hr_timeout = nres->hr_timeout; 338 if (cres->hr_workerpid != 0) { 339 if (kill(cres->hr_workerpid, SIGHUP) < 0) { 340 pjdlog_errno(LOG_WARNING, 341 "Unable to send SIGHUP to worker process %u", 342 (unsigned int)cres->hr_workerpid); 343 } 344 } 345 } 346 } 347 348 yy_config_free(newcfg); 349 pjdlog_info("Configuration reloaded successfully."); 350 return; 351failed: 352 if (newcfg != NULL) { 353 if (newcfg->hc_controlconn != NULL) 354 proto_close(newcfg->hc_controlconn); 355 if (newcfg->hc_listenconn != NULL) 356 proto_close(newcfg->hc_listenconn); 357 yy_config_free(newcfg); 358 } 359 pjdlog_warning("Configuration not reloaded."); 360} 361 362static void 363terminate_workers(void) 364{ 365 struct hast_resource *res; 366 367 pjdlog_info("Termination signal received, exiting."); 368 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) { 369 if (res->hr_workerpid == 0) 370 continue; 371 pjdlog_info("Terminating worker process (resource=%s, role=%s, pid=%u).", 372 res->hr_name, role2str(res->hr_role), res->hr_workerpid); 373 if (kill(res->hr_workerpid, SIGTERM) == 0) 374 continue; 375 pjdlog_errno(LOG_WARNING, 376 "Unable to send signal to worker process (resource=%s, role=%s, pid=%u).", 377 res->hr_name, role2str(res->hr_role), res->hr_workerpid); 378 } 379} 380 381static void 382listen_accept(void) 383{ 384 struct hast_resource *res; 385 struct proto_conn *conn; 386 struct nv *nvin, *nvout, *nverr; 387 const char *resname; 388 const unsigned char *token; 389 char laddr[256], raddr[256]; 390 size_t size; 391 pid_t pid; 392 int status; 393 394 proto_local_address(cfg->hc_listenconn, laddr, sizeof(laddr)); 395 pjdlog_debug(1, "Accepting connection to %s.", laddr); 396 397 if (proto_accept(cfg->hc_listenconn, &conn) < 0) { 398 pjdlog_errno(LOG_ERR, "Unable to accept connection %s", laddr); 399 return; 400 } 401 402 proto_local_address(conn, laddr, sizeof(laddr)); 403 proto_remote_address(conn, raddr, sizeof(raddr)); 404 pjdlog_info("Connection from %s to %s.", raddr, laddr); 405 406 /* Error in setting timeout is not critical, but why should it fail? */ 407 if (proto_timeout(conn, HAST_TIMEOUT) < 0) 408 pjdlog_errno(LOG_WARNING, "Unable to set connection timeout"); 409 410 nvin = nvout = nverr = NULL; 411 412 /* 413 * Before receiving any data see if remote host have access to any 414 * resource. 415 */ 416 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) { 417 if (proto_address_match(conn, res->hr_remoteaddr)) 418 break; 419 } 420 if (res == NULL) { 421 pjdlog_error("Client %s isn't known.", raddr); 422 goto close; 423 } 424 /* Ok, remote host can access at least one resource. */ 425 426 if (hast_proto_recv_hdr(conn, &nvin) < 0) { 427 pjdlog_errno(LOG_ERR, "Unable to receive header from %s", 428 raddr); 429 goto close; 430 } 431 432 resname = nv_get_string(nvin, "resource"); 433 if (resname == NULL) { 434 pjdlog_error("No 'resource' field in the header received from %s.", 435 raddr); 436 goto close; 437 } 438 pjdlog_debug(2, "%s: resource=%s", raddr, resname); 439 token = nv_get_uint8_array(nvin, &size, "token"); 440 /* 441 * NULL token means that this is first conection. 442 */ 443 if (token != NULL && size != sizeof(res->hr_token)) { 444 pjdlog_error("Received token of invalid size from %s (expected %zu, got %zu).", 445 raddr, sizeof(res->hr_token), size); 446 goto close; 447 } 448 449 /* 450 * From now on we want to send errors to the remote node. 451 */ 452 nverr = nv_alloc(); 453 454 /* Find resource related to this connection. */ 455 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) { 456 if (strcmp(resname, res->hr_name) == 0) 457 break; 458 } 459 /* Have we found the resource? */ 460 if (res == NULL) { 461 pjdlog_error("No resource '%s' as requested by %s.", 462 resname, raddr); 463 nv_add_stringf(nverr, "errmsg", "Resource not configured."); 464 goto fail; 465 } 466 467 /* Now that we know resource name setup log prefix. */ 468 pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role)); 469 470 /* Does the remote host have access to this resource? */ 471 if (!proto_address_match(conn, res->hr_remoteaddr)) { 472 pjdlog_error("Client %s has no access to the resource.", raddr); 473 nv_add_stringf(nverr, "errmsg", "No access to the resource."); 474 goto fail; 475 } 476 /* Is the resource marked as secondary? */ 477 if (res->hr_role != HAST_ROLE_SECONDARY) { 478 pjdlog_error("We act as %s for the resource and not as %s as requested by %s.", 479 role2str(res->hr_role), role2str(HAST_ROLE_SECONDARY), 480 raddr); 481 nv_add_stringf(nverr, "errmsg", 482 "Remote node acts as %s for the resource and not as %s.", 483 role2str(res->hr_role), role2str(HAST_ROLE_SECONDARY)); 484 goto fail; 485 } 486 /* Does token (if exists) match? */ 487 if (token != NULL && memcmp(token, res->hr_token, 488 sizeof(res->hr_token)) != 0) { 489 pjdlog_error("Token received from %s doesn't match.", raddr); 490 nv_add_stringf(nverr, "errmsg", "Token doesn't match."); 491 goto fail; 492 } 493 /* 494 * If there is no token, but we have half-open connection 495 * (only remotein) or full connection (worker process is running) 496 * we have to cancel those and accept the new connection. 497 */ 498 if (token == NULL) { 499 assert(res->hr_remoteout == NULL); 500 pjdlog_debug(1, "Initial connection from %s.", raddr); 501 if (res->hr_workerpid != 0) { 502 assert(res->hr_remotein == NULL); 503 pjdlog_debug(1, 504 "Worker process exists (pid=%u), stopping it.", 505 (unsigned int)res->hr_workerpid); 506 /* Stop child process. */ 507 if (kill(res->hr_workerpid, SIGINT) < 0) { 508 pjdlog_errno(LOG_ERR, 509 "Unable to stop worker process (pid=%u)", 510 (unsigned int)res->hr_workerpid); 511 /* 512 * Other than logging the problem we 513 * ignore it - nothing smart to do. 514 */ 515 } 516 /* Wait for it to exit. */ 517 else if ((pid = waitpid(res->hr_workerpid, 518 &status, 0)) != res->hr_workerpid) { 519 /* We can only log the problem. */ 520 pjdlog_errno(LOG_ERR, 521 "Waiting for worker process (pid=%u) failed", 522 (unsigned int)res->hr_workerpid); 523 } else { 524 child_exit_log(res->hr_workerpid, status); 525 } 526 child_cleanup(res); 527 } else if (res->hr_remotein != NULL) { 528 char oaddr[256]; 529 530 proto_remote_address(conn, oaddr, sizeof(oaddr)); 531 pjdlog_debug(1, 532 "Canceling half-open connection from %s on connection from %s.", 533 oaddr, raddr); 534 proto_close(res->hr_remotein); 535 res->hr_remotein = NULL; 536 } 537 } 538 539 /* 540 * Checks and cleanups are done. 541 */ 542 543 if (token == NULL) { 544 arc4random_buf(res->hr_token, sizeof(res->hr_token)); 545 nvout = nv_alloc(); 546 nv_add_uint8_array(nvout, res->hr_token, 547 sizeof(res->hr_token), "token"); 548 if (nv_error(nvout) != 0) { 549 pjdlog_common(LOG_ERR, 0, nv_error(nvout), 550 "Unable to prepare return header for %s", raddr); 551 nv_add_stringf(nverr, "errmsg", 552 "Remote node was unable to prepare return header: %s.", 553 strerror(nv_error(nvout))); 554 goto fail; 555 } 556 if (hast_proto_send(NULL, conn, nvout, NULL, 0) < 0) { 557 int error = errno; 558 559 pjdlog_errno(LOG_ERR, "Unable to send response to %s", 560 raddr); 561 nv_add_stringf(nverr, "errmsg", 562 "Remote node was unable to send response: %s.", 563 strerror(error)); 564 goto fail; 565 } 566 res->hr_remotein = conn; 567 pjdlog_debug(1, "Incoming connection from %s configured.", 568 raddr); 569 } else { 570 res->hr_remoteout = conn; 571 pjdlog_debug(1, "Outgoing connection to %s configured.", raddr); 572 hastd_secondary(res, nvin); 573 } 574 nv_free(nvin); 575 nv_free(nvout); 576 nv_free(nverr); 577 pjdlog_prefix_set("%s", ""); 578 return; 579fail: 580 if (nv_error(nverr) != 0) { 581 pjdlog_common(LOG_ERR, 0, nv_error(nverr), 582 "Unable to prepare error header for %s", raddr); 583 goto close; 584 } 585 if (hast_proto_send(NULL, conn, nverr, NULL, 0) < 0) { 586 pjdlog_errno(LOG_ERR, "Unable to send error to %s", raddr); 587 goto close; 588 } 589close: 590 if (nvin != NULL) 591 nv_free(nvin); 592 if (nvout != NULL) 593 nv_free(nvout); 594 if (nverr != NULL) 595 nv_free(nverr); 596 proto_close(conn); 597 pjdlog_prefix_set("%s", ""); 598} 599 600static void 601main_loop(void) 602{ 603 struct hast_resource *res; 604 struct timeval seltimeout; 605 struct timespec sigtimeout; 606 int fd, maxfd, ret, signo; 607 sigset_t mask; 608 fd_set rfds; 609 610 seltimeout.tv_sec = REPORT_INTERVAL; 611 seltimeout.tv_usec = 0; 612 sigtimeout.tv_sec = 0; 613 sigtimeout.tv_nsec = 0; 614 615 PJDLOG_VERIFY(sigemptyset(&mask) == 0); 616 PJDLOG_VERIFY(sigaddset(&mask, SIGHUP) == 0); 617 PJDLOG_VERIFY(sigaddset(&mask, SIGINT) == 0); 618 PJDLOG_VERIFY(sigaddset(&mask, SIGTERM) == 0); 619 PJDLOG_VERIFY(sigaddset(&mask, SIGCHLD) == 0); 620 621 for (;;) { 622 while ((signo = sigtimedwait(&mask, NULL, &sigtimeout)) != -1) { 623 switch (signo) { 624 case SIGINT: 625 case SIGTERM: 626 sigexit_received = true; 627 terminate_workers(); 628 exit(EX_OK); 629 break; 630 case SIGCHLD: 631 child_exit(); 632 break; 633 case SIGHUP: 634 hastd_reload(); 635 break; 636 default: 637 assert(!"invalid condition"); 638 } 639 } 640 641 /* Setup descriptors for select(2). */ 642 FD_ZERO(&rfds); 643 maxfd = fd = proto_descriptor(cfg->hc_controlconn); 644 assert(fd >= 0); 645 FD_SET(fd, &rfds); 646 fd = proto_descriptor(cfg->hc_listenconn); 647 assert(fd >= 0); 648 FD_SET(fd, &rfds); 649 maxfd = fd > maxfd ? fd : maxfd; 650 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) { 651 if (res->hr_event == NULL) 652 continue; 653 fd = proto_descriptor(res->hr_event); 654 assert(fd >= 0); 655 FD_SET(fd, &rfds); 656 maxfd = fd > maxfd ? fd : maxfd; 657 } 658 659 assert(maxfd + 1 <= (int)FD_SETSIZE); 660 ret = select(maxfd + 1, &rfds, NULL, NULL, &seltimeout); 661 if (ret == 0) 662 hook_check(false); 663 else if (ret == -1) { 664 if (errno == EINTR) 665 continue; 666 KEEP_ERRNO((void)pidfile_remove(pfh)); 667 pjdlog_exit(EX_OSERR, "select() failed"); 668 } 669 670 if (FD_ISSET(proto_descriptor(cfg->hc_controlconn), &rfds)) 671 control_handle(cfg); 672 if (FD_ISSET(proto_descriptor(cfg->hc_listenconn), &rfds)) 673 listen_accept(); 674 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) { 675 if (res->hr_event == NULL) 676 continue; 677 if (FD_ISSET(proto_descriptor(res->hr_event), &rfds)) { 678 if (event_recv(res) == 0) 679 continue; 680 /* The worker process exited? */ 681 proto_close(res->hr_event); 682 res->hr_event = NULL; 683 } 684 } 685 } 686} 687 688static void 689dummy_sighandler(int sig __unused) 690{ 691 /* Nothing to do. */ 692} 693 694int 695main(int argc, char *argv[]) 696{ 697 const char *pidfile; 698 pid_t otherpid; 699 bool foreground; 700 int debuglevel; 701 sigset_t mask; 702 703 g_gate_load(); 704 705 foreground = false; 706 debuglevel = 0; 707 pidfile = HASTD_PIDFILE; 708 709 for (;;) { 710 int ch; 711 712 ch = getopt(argc, argv, "c:dFhP:"); 713 if (ch == -1) 714 break; 715 switch (ch) { 716 case 'c': 717 cfgpath = optarg; 718 break; 719 case 'd': 720 debuglevel++; 721 break; 722 case 'F': 723 foreground = true; 724 break; 725 case 'P': 726 pidfile = optarg; 727 break; 728 case 'h': 729 default: 730 usage(); 731 } 732 } 733 argc -= optind; 734 argv += optind; 735 736 pjdlog_debug_set(debuglevel); 737 738 pfh = pidfile_open(pidfile, 0600, &otherpid); 739 if (pfh == NULL) { 740 if (errno == EEXIST) { 741 pjdlog_exitx(EX_TEMPFAIL, 742 "Another hastd is already running, pid: %jd.", 743 (intmax_t)otherpid); 744 } 745 /* If we cannot create pidfile from other reasons, only warn. */ 746 pjdlog_errno(LOG_WARNING, "Unable to open or create pidfile"); 747 } 748 749 cfg = yy_config_parse(cfgpath, true); 750 assert(cfg != NULL); 751 752 /* 753 * Because SIGCHLD is ignored by default, setup dummy handler for it, 754 * so we can mask it. 755 */ 756 PJDLOG_VERIFY(signal(SIGCHLD, dummy_sighandler) != SIG_ERR); 757 PJDLOG_VERIFY(sigemptyset(&mask) == 0); 758 PJDLOG_VERIFY(sigaddset(&mask, SIGHUP) == 0); 759 PJDLOG_VERIFY(sigaddset(&mask, SIGINT) == 0); 760 PJDLOG_VERIFY(sigaddset(&mask, SIGTERM) == 0); 761 PJDLOG_VERIFY(sigaddset(&mask, SIGCHLD) == 0); 762 PJDLOG_VERIFY(sigprocmask(SIG_SETMASK, &mask, NULL) == 0); 763 764 /* Listen on control address. */ 765 if (proto_server(cfg->hc_controladdr, &cfg->hc_controlconn) < 0) { 766 KEEP_ERRNO((void)pidfile_remove(pfh)); 767 pjdlog_exit(EX_OSERR, "Unable to listen on control address %s", 768 cfg->hc_controladdr); 769 } 770 /* Listen for remote connections. */ 771 if (proto_server(cfg->hc_listenaddr, &cfg->hc_listenconn) < 0) { 772 KEEP_ERRNO((void)pidfile_remove(pfh)); 773 pjdlog_exit(EX_OSERR, "Unable to listen on address %s", 774 cfg->hc_listenaddr); 775 } 776 777 if (!foreground) { 778 if (daemon(0, 0) < 0) { 779 KEEP_ERRNO((void)pidfile_remove(pfh)); 780 pjdlog_exit(EX_OSERR, "Unable to daemonize"); 781 } 782 783 /* Start logging to syslog. */ 784 pjdlog_mode_set(PJDLOG_MODE_SYSLOG); 785 786 /* Write PID to a file. */ 787 if (pidfile_write(pfh) < 0) { 788 pjdlog_errno(LOG_WARNING, 789 "Unable to write PID to a file"); 790 } 791 } 792 793 hook_init(); 794 795 main_loop(); 796 797 exit(0); 798} 799