1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2009-2010 The FreeBSD Foundation
5 * Copyright (c) 2010-2011 Pawel Jakub Dawidek <pawel@dawidek.net>
6 * All rights reserved.
7 *
8 * This software was developed by Pawel Jakub Dawidek under sponsorship from
9 * the FreeBSD Foundation.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include <sys/param.h>
34 #include <sys/linker.h>
35 #include <sys/module.h>
36 #include <sys/stat.h>
37 #include <sys/wait.h>
38
39 #include <err.h>
40 #include <errno.h>
41 #include <libutil.h>
42 #include <signal.h>
43 #include <stdbool.h>
44 #include <stdio.h>
45 #include <stdlib.h>
46 #include <string.h>
47 #include <sysexits.h>
48 #include <time.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. */
63 const char *cfgpath = HAST_CONFIG;
64 /* Hastd configuration. */
65 static struct hastd_config *cfg;
66 /* Was SIGINT or SIGTERM signal received? */
67 bool sigexit_received = false;
68 /* Path to pidfile. */
69 static const char *pidfile;
70 /* Pidfile handle. */
71 struct pidfh *pfh;
72 /* Do we run in foreground? */
73 static bool foreground;
74
75 /* How often check for hooks running for too long. */
76 #define REPORT_INTERVAL 5
77
78 static void
usage(void)79 usage(void)
80 {
81
82 errx(EX_USAGE, "[-dFh] [-c config] [-P pidfile]");
83 }
84
85 static void
g_gate_load(void)86 g_gate_load(void)
87 {
88
89 if (modfind("g_gate") == -1) {
90 /* Not present in kernel, try loading it. */
91 if (kldload("geom_gate") == -1 || modfind("g_gate") == -1) {
92 if (errno != EEXIST) {
93 pjdlog_exit(EX_OSERR,
94 "Unable to load geom_gate module");
95 }
96 }
97 }
98 }
99
100 void
descriptors_cleanup(struct hast_resource * res)101 descriptors_cleanup(struct hast_resource *res)
102 {
103 struct hast_resource *tres, *tmres;
104 struct hastd_listen *lst;
105
106 TAILQ_FOREACH_SAFE(tres, &cfg->hc_resources, hr_next, tmres) {
107 if (tres == res) {
108 PJDLOG_VERIFY(res->hr_role == HAST_ROLE_SECONDARY ||
109 (res->hr_remotein == NULL &&
110 res->hr_remoteout == NULL));
111 continue;
112 }
113 if (tres->hr_remotein != NULL)
114 proto_close(tres->hr_remotein);
115 if (tres->hr_remoteout != NULL)
116 proto_close(tres->hr_remoteout);
117 if (tres->hr_ctrl != NULL)
118 proto_close(tres->hr_ctrl);
119 if (tres->hr_event != NULL)
120 proto_close(tres->hr_event);
121 if (tres->hr_conn != NULL)
122 proto_close(tres->hr_conn);
123 TAILQ_REMOVE(&cfg->hc_resources, tres, hr_next);
124 free(tres);
125 }
126 if (cfg->hc_controlin != NULL)
127 proto_close(cfg->hc_controlin);
128 proto_close(cfg->hc_controlconn);
129 while ((lst = TAILQ_FIRST(&cfg->hc_listen)) != NULL) {
130 TAILQ_REMOVE(&cfg->hc_listen, lst, hl_next);
131 if (lst->hl_conn != NULL)
132 proto_close(lst->hl_conn);
133 free(lst);
134 }
135 (void)pidfile_close(pfh);
136 hook_fini();
137 pjdlog_fini();
138 }
139
140 static const char *
dtype2str(mode_t mode)141 dtype2str(mode_t mode)
142 {
143
144 if (S_ISBLK(mode))
145 return ("block device");
146 else if (S_ISCHR(mode))
147 return ("character device");
148 else if (S_ISDIR(mode))
149 return ("directory");
150 else if (S_ISFIFO(mode))
151 return ("pipe or FIFO");
152 else if (S_ISLNK(mode))
153 return ("symbolic link");
154 else if (S_ISREG(mode))
155 return ("regular file");
156 else if (S_ISSOCK(mode))
157 return ("socket");
158 else if (S_ISWHT(mode))
159 return ("whiteout");
160 else
161 return ("unknown");
162 }
163
164 void
descriptors_assert(const struct hast_resource * res,int pjdlogmode)165 descriptors_assert(const struct hast_resource *res, int pjdlogmode)
166 {
167 char msg[256];
168 struct stat sb;
169 long maxfd;
170 bool isopen;
171 mode_t mode;
172 int fd;
173
174 /*
175 * At this point descriptor to syslog socket is closed, so if we want
176 * to log assertion message, we have to first store it in 'msg' local
177 * buffer and then open syslog socket and log it.
178 */
179 msg[0] = '\0';
180
181 maxfd = sysconf(_SC_OPEN_MAX);
182 if (maxfd == -1) {
183 pjdlog_init(pjdlogmode);
184 pjdlog_prefix_set("[%s] (%s) ", res->hr_name,
185 role2str(res->hr_role));
186 pjdlog_errno(LOG_WARNING, "sysconf(_SC_OPEN_MAX) failed");
187 pjdlog_fini();
188 maxfd = 16384;
189 }
190 for (fd = 0; fd <= maxfd; fd++) {
191 if (fstat(fd, &sb) == 0) {
192 isopen = true;
193 mode = sb.st_mode;
194 } else if (errno == EBADF) {
195 isopen = false;
196 mode = 0;
197 } else {
198 (void)snprintf(msg, sizeof(msg),
199 "Unable to fstat descriptor %d: %s", fd,
200 strerror(errno));
201 break;
202 }
203 if (fd == STDIN_FILENO || fd == STDOUT_FILENO ||
204 fd == STDERR_FILENO) {
205 if (!isopen) {
206 (void)snprintf(msg, sizeof(msg),
207 "Descriptor %d (%s) is closed, but should be open.",
208 fd, (fd == STDIN_FILENO ? "stdin" :
209 (fd == STDOUT_FILENO ? "stdout" : "stderr")));
210 break;
211 }
212 } else if (fd == proto_descriptor(res->hr_event)) {
213 if (!isopen) {
214 (void)snprintf(msg, sizeof(msg),
215 "Descriptor %d (event) is closed, but should be open.",
216 fd);
217 break;
218 }
219 if (!S_ISSOCK(mode)) {
220 (void)snprintf(msg, sizeof(msg),
221 "Descriptor %d (event) is %s, but should be %s.",
222 fd, dtype2str(mode), dtype2str(S_IFSOCK));
223 break;
224 }
225 } else if (fd == proto_descriptor(res->hr_ctrl)) {
226 if (!isopen) {
227 (void)snprintf(msg, sizeof(msg),
228 "Descriptor %d (ctrl) is closed, but should be open.",
229 fd);
230 break;
231 }
232 if (!S_ISSOCK(mode)) {
233 (void)snprintf(msg, sizeof(msg),
234 "Descriptor %d (ctrl) is %s, but should be %s.",
235 fd, dtype2str(mode), dtype2str(S_IFSOCK));
236 break;
237 }
238 } else if (res->hr_role == HAST_ROLE_PRIMARY &&
239 fd == proto_descriptor(res->hr_conn)) {
240 if (!isopen) {
241 (void)snprintf(msg, sizeof(msg),
242 "Descriptor %d (conn) is closed, but should be open.",
243 fd);
244 break;
245 }
246 if (!S_ISSOCK(mode)) {
247 (void)snprintf(msg, sizeof(msg),
248 "Descriptor %d (conn) is %s, but should be %s.",
249 fd, dtype2str(mode), dtype2str(S_IFSOCK));
250 break;
251 }
252 } else if (res->hr_role == HAST_ROLE_SECONDARY &&
253 res->hr_conn != NULL &&
254 fd == proto_descriptor(res->hr_conn)) {
255 if (isopen) {
256 (void)snprintf(msg, sizeof(msg),
257 "Descriptor %d (conn) is open, but should be closed.",
258 fd);
259 break;
260 }
261 } else if (res->hr_role == HAST_ROLE_SECONDARY &&
262 fd == proto_descriptor(res->hr_remotein)) {
263 if (!isopen) {
264 (void)snprintf(msg, sizeof(msg),
265 "Descriptor %d (remote in) is closed, but should be open.",
266 fd);
267 break;
268 }
269 if (!S_ISSOCK(mode)) {
270 (void)snprintf(msg, sizeof(msg),
271 "Descriptor %d (remote in) is %s, but should be %s.",
272 fd, dtype2str(mode), dtype2str(S_IFSOCK));
273 break;
274 }
275 } else if (res->hr_role == HAST_ROLE_SECONDARY &&
276 fd == proto_descriptor(res->hr_remoteout)) {
277 if (!isopen) {
278 (void)snprintf(msg, sizeof(msg),
279 "Descriptor %d (remote out) is closed, but should be open.",
280 fd);
281 break;
282 }
283 if (!S_ISSOCK(mode)) {
284 (void)snprintf(msg, sizeof(msg),
285 "Descriptor %d (remote out) is %s, but should be %s.",
286 fd, dtype2str(mode), dtype2str(S_IFSOCK));
287 break;
288 }
289 } else {
290 if (isopen) {
291 (void)snprintf(msg, sizeof(msg),
292 "Descriptor %d is open (%s), but should be closed.",
293 fd, dtype2str(mode));
294 break;
295 }
296 }
297 }
298 if (msg[0] != '\0') {
299 pjdlog_init(pjdlogmode);
300 pjdlog_prefix_set("[%s] (%s) ", res->hr_name,
301 role2str(res->hr_role));
302 PJDLOG_ABORT("%s", msg);
303 }
304 }
305
306 static void
child_exit_log(unsigned int pid,int status)307 child_exit_log(unsigned int pid, int status)
308 {
309
310 if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
311 pjdlog_debug(1, "Worker process exited gracefully (pid=%u).",
312 pid);
313 } else if (WIFSIGNALED(status)) {
314 pjdlog_error("Worker process killed (pid=%u, signal=%d).",
315 pid, WTERMSIG(status));
316 } else {
317 pjdlog_error("Worker process exited ungracefully (pid=%u, exitcode=%d).",
318 pid, WIFEXITED(status) ? WEXITSTATUS(status) : -1);
319 }
320 }
321
322 static void
child_exit(void)323 child_exit(void)
324 {
325 struct hast_resource *res;
326 int status;
327 pid_t pid;
328
329 while ((pid = wait3(&status, WNOHANG, NULL)) > 0) {
330 /* Find resource related to the process that just exited. */
331 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
332 if (pid == res->hr_workerpid)
333 break;
334 }
335 if (res == NULL) {
336 /*
337 * This can happen when new connection arrives and we
338 * cancel child responsible for the old one or if this
339 * was hook which we executed.
340 */
341 hook_check_one(pid, status);
342 continue;
343 }
344 pjdlog_prefix_set("[%s] (%s) ", res->hr_name,
345 role2str(res->hr_role));
346 child_exit_log(pid, status);
347 child_cleanup(res);
348 if (res->hr_role == HAST_ROLE_PRIMARY) {
349 /*
350 * Restart child process if it was killed by signal
351 * or exited because of temporary problem.
352 */
353 if (WIFSIGNALED(status) ||
354 (WIFEXITED(status) &&
355 WEXITSTATUS(status) == EX_TEMPFAIL)) {
356 sleep(1);
357 pjdlog_info("Restarting worker process.");
358 hastd_primary(res);
359 } else {
360 res->hr_role = HAST_ROLE_INIT;
361 pjdlog_info("Changing resource role back to %s.",
362 role2str(res->hr_role));
363 }
364 }
365 pjdlog_prefix_set("%s", "");
366 }
367 }
368
369 static bool
resource_needs_restart(const struct hast_resource * res0,const struct hast_resource * res1)370 resource_needs_restart(const struct hast_resource *res0,
371 const struct hast_resource *res1)
372 {
373
374 PJDLOG_ASSERT(strcmp(res0->hr_name, res1->hr_name) == 0);
375
376 if (strcmp(res0->hr_provname, res1->hr_provname) != 0)
377 return (true);
378 if (strcmp(res0->hr_localpath, res1->hr_localpath) != 0)
379 return (true);
380 if (res0->hr_role == HAST_ROLE_INIT ||
381 res0->hr_role == HAST_ROLE_SECONDARY) {
382 if (strcmp(res0->hr_remoteaddr, res1->hr_remoteaddr) != 0)
383 return (true);
384 if (strcmp(res0->hr_sourceaddr, res1->hr_sourceaddr) != 0)
385 return (true);
386 if (res0->hr_replication != res1->hr_replication)
387 return (true);
388 if (res0->hr_checksum != res1->hr_checksum)
389 return (true);
390 if (res0->hr_compression != res1->hr_compression)
391 return (true);
392 if (res0->hr_timeout != res1->hr_timeout)
393 return (true);
394 if (strcmp(res0->hr_exec, res1->hr_exec) != 0)
395 return (true);
396 /*
397 * When metaflush has changed we don't really need restart,
398 * but it is just easier this way.
399 */
400 if (res0->hr_metaflush != res1->hr_metaflush)
401 return (true);
402 }
403 return (false);
404 }
405
406 static bool
resource_needs_reload(const struct hast_resource * res0,const struct hast_resource * res1)407 resource_needs_reload(const struct hast_resource *res0,
408 const struct hast_resource *res1)
409 {
410
411 PJDLOG_ASSERT(strcmp(res0->hr_name, res1->hr_name) == 0);
412 PJDLOG_ASSERT(strcmp(res0->hr_provname, res1->hr_provname) == 0);
413 PJDLOG_ASSERT(strcmp(res0->hr_localpath, res1->hr_localpath) == 0);
414
415 if (res0->hr_role != HAST_ROLE_PRIMARY)
416 return (false);
417
418 if (strcmp(res0->hr_remoteaddr, res1->hr_remoteaddr) != 0)
419 return (true);
420 if (strcmp(res0->hr_sourceaddr, res1->hr_sourceaddr) != 0)
421 return (true);
422 if (res0->hr_replication != res1->hr_replication)
423 return (true);
424 if (res0->hr_checksum != res1->hr_checksum)
425 return (true);
426 if (res0->hr_compression != res1->hr_compression)
427 return (true);
428 if (res0->hr_timeout != res1->hr_timeout)
429 return (true);
430 if (strcmp(res0->hr_exec, res1->hr_exec) != 0)
431 return (true);
432 if (res0->hr_metaflush != res1->hr_metaflush)
433 return (true);
434 return (false);
435 }
436
437 static void
resource_reload(const struct hast_resource * res)438 resource_reload(const struct hast_resource *res)
439 {
440 struct nv *nvin, *nvout;
441 int error;
442
443 PJDLOG_ASSERT(res->hr_role == HAST_ROLE_PRIMARY);
444
445 nvout = nv_alloc();
446 nv_add_uint8(nvout, CONTROL_RELOAD, "cmd");
447 nv_add_string(nvout, res->hr_remoteaddr, "remoteaddr");
448 nv_add_string(nvout, res->hr_sourceaddr, "sourceaddr");
449 nv_add_int32(nvout, (int32_t)res->hr_replication, "replication");
450 nv_add_int32(nvout, (int32_t)res->hr_checksum, "checksum");
451 nv_add_int32(nvout, (int32_t)res->hr_compression, "compression");
452 nv_add_int32(nvout, (int32_t)res->hr_timeout, "timeout");
453 nv_add_string(nvout, res->hr_exec, "exec");
454 nv_add_int32(nvout, (int32_t)res->hr_metaflush, "metaflush");
455 if (nv_error(nvout) != 0) {
456 nv_free(nvout);
457 pjdlog_error("Unable to allocate header for reload message.");
458 return;
459 }
460 if (hast_proto_send(res, res->hr_ctrl, nvout, NULL, 0) == -1) {
461 pjdlog_errno(LOG_ERR, "Unable to send reload message");
462 nv_free(nvout);
463 return;
464 }
465 nv_free(nvout);
466
467 /* Receive response. */
468 if (hast_proto_recv_hdr(res->hr_ctrl, &nvin) == -1) {
469 pjdlog_errno(LOG_ERR, "Unable to receive reload reply");
470 return;
471 }
472 error = nv_get_int16(nvin, "error");
473 nv_free(nvin);
474 if (error != 0) {
475 pjdlog_common(LOG_ERR, 0, error, "Reload failed");
476 return;
477 }
478 }
479
480 static void
hastd_reload(void)481 hastd_reload(void)
482 {
483 struct hastd_config *newcfg;
484 struct hast_resource *nres, *cres, *tres;
485 struct hastd_listen *nlst, *clst;
486 struct pidfh *newpfh;
487 unsigned int nlisten;
488 uint8_t role;
489 pid_t otherpid;
490
491 pjdlog_info("Reloading configuration...");
492
493 newpfh = NULL;
494
495 newcfg = yy_config_parse(cfgpath, false);
496 if (newcfg == NULL)
497 goto failed;
498
499 /*
500 * Check if control address has changed.
501 */
502 if (strcmp(cfg->hc_controladdr, newcfg->hc_controladdr) != 0) {
503 if (proto_server(newcfg->hc_controladdr,
504 &newcfg->hc_controlconn) == -1) {
505 pjdlog_errno(LOG_ERR,
506 "Unable to listen on control address %s",
507 newcfg->hc_controladdr);
508 goto failed;
509 }
510 }
511 /*
512 * Check if any listen address has changed.
513 */
514 nlisten = 0;
515 TAILQ_FOREACH(nlst, &newcfg->hc_listen, hl_next) {
516 TAILQ_FOREACH(clst, &cfg->hc_listen, hl_next) {
517 if (strcmp(nlst->hl_addr, clst->hl_addr) == 0)
518 break;
519 }
520 if (clst != NULL && clst->hl_conn != NULL) {
521 pjdlog_info("Keep listening on address %s.",
522 nlst->hl_addr);
523 nlst->hl_conn = clst->hl_conn;
524 nlisten++;
525 } else if (proto_server(nlst->hl_addr, &nlst->hl_conn) == 0) {
526 pjdlog_info("Listening on new address %s.",
527 nlst->hl_addr);
528 nlisten++;
529 } else {
530 pjdlog_errno(LOG_WARNING,
531 "Unable to listen on address %s", nlst->hl_addr);
532 }
533 }
534 if (nlisten == 0) {
535 pjdlog_error("No addresses to listen on.");
536 goto failed;
537 }
538 /*
539 * Check if pidfile's path has changed.
540 */
541 if (!foreground && pidfile == NULL &&
542 strcmp(cfg->hc_pidfile, newcfg->hc_pidfile) != 0) {
543 newpfh = pidfile_open(newcfg->hc_pidfile, 0600, &otherpid);
544 if (newpfh == NULL) {
545 if (errno == EEXIST) {
546 pjdlog_errno(LOG_WARNING,
547 "Another hastd is already running, pidfile: %s, pid: %jd.",
548 newcfg->hc_pidfile, (intmax_t)otherpid);
549 } else {
550 pjdlog_errno(LOG_WARNING,
551 "Unable to open or create pidfile %s",
552 newcfg->hc_pidfile);
553 }
554 } else if (pidfile_write(newpfh) == -1) {
555 /* Write PID to a file. */
556 pjdlog_errno(LOG_WARNING,
557 "Unable to write PID to file %s",
558 newcfg->hc_pidfile);
559 } else {
560 pjdlog_debug(1, "PID stored in %s.",
561 newcfg->hc_pidfile);
562 }
563 }
564
565 /* No failures from now on. */
566
567 /*
568 * Switch to new control socket.
569 */
570 if (newcfg->hc_controlconn != NULL) {
571 pjdlog_info("Control socket changed from %s to %s.",
572 cfg->hc_controladdr, newcfg->hc_controladdr);
573 proto_close(cfg->hc_controlconn);
574 cfg->hc_controlconn = newcfg->hc_controlconn;
575 newcfg->hc_controlconn = NULL;
576 strlcpy(cfg->hc_controladdr, newcfg->hc_controladdr,
577 sizeof(cfg->hc_controladdr));
578 }
579 /*
580 * Switch to new pidfile.
581 */
582 if (newpfh != NULL) {
583 pjdlog_info("Pidfile changed from %s to %s.", cfg->hc_pidfile,
584 newcfg->hc_pidfile);
585 (void)pidfile_remove(pfh);
586 pfh = newpfh;
587 (void)strlcpy(cfg->hc_pidfile, newcfg->hc_pidfile,
588 sizeof(cfg->hc_pidfile));
589 }
590 /*
591 * Switch to new listen addresses. Close all that were removed.
592 */
593 while ((clst = TAILQ_FIRST(&cfg->hc_listen)) != NULL) {
594 TAILQ_FOREACH(nlst, &newcfg->hc_listen, hl_next) {
595 if (strcmp(nlst->hl_addr, clst->hl_addr) == 0)
596 break;
597 }
598 if (nlst == NULL && clst->hl_conn != NULL) {
599 proto_close(clst->hl_conn);
600 pjdlog_info("No longer listening on address %s.",
601 clst->hl_addr);
602 }
603 TAILQ_REMOVE(&cfg->hc_listen, clst, hl_next);
604 free(clst);
605 }
606 TAILQ_CONCAT(&cfg->hc_listen, &newcfg->hc_listen, hl_next);
607
608 /*
609 * Stop and remove resources that were removed from the configuration.
610 */
611 TAILQ_FOREACH_SAFE(cres, &cfg->hc_resources, hr_next, tres) {
612 TAILQ_FOREACH(nres, &newcfg->hc_resources, hr_next) {
613 if (strcmp(cres->hr_name, nres->hr_name) == 0)
614 break;
615 }
616 if (nres == NULL) {
617 control_set_role(cres, HAST_ROLE_INIT);
618 TAILQ_REMOVE(&cfg->hc_resources, cres, hr_next);
619 pjdlog_info("Resource %s removed.", cres->hr_name);
620 free(cres);
621 }
622 }
623 /*
624 * Move new resources to the current configuration.
625 */
626 TAILQ_FOREACH_SAFE(nres, &newcfg->hc_resources, hr_next, tres) {
627 TAILQ_FOREACH(cres, &cfg->hc_resources, hr_next) {
628 if (strcmp(cres->hr_name, nres->hr_name) == 0)
629 break;
630 }
631 if (cres == NULL) {
632 TAILQ_REMOVE(&newcfg->hc_resources, nres, hr_next);
633 TAILQ_INSERT_TAIL(&cfg->hc_resources, nres, hr_next);
634 pjdlog_info("Resource %s added.", nres->hr_name);
635 }
636 }
637 /*
638 * Deal with modified resources.
639 * Depending on what has changed exactly we might want to perform
640 * different actions.
641 *
642 * We do full resource restart in the following situations:
643 * Resource role is INIT or SECONDARY.
644 * Resource role is PRIMARY and path to local component or provider
645 * name has changed.
646 * In case of PRIMARY, the worker process will be killed and restarted,
647 * which also means removing /dev/hast/<name> provider and
648 * recreating it.
649 *
650 * We do just reload (send SIGHUP to worker process) if we act as
651 * PRIMARY, but only if remote address, source address, replication
652 * mode, timeout, execution path or metaflush has changed.
653 * For those, there is no need to restart worker process.
654 * If PRIMARY receives SIGHUP, it will reconnect if remote address or
655 * source address has changed or it will set new timeout if only timeout
656 * has changed or it will update metaflush if only metaflush has
657 * changed.
658 */
659 TAILQ_FOREACH_SAFE(nres, &newcfg->hc_resources, hr_next, tres) {
660 TAILQ_FOREACH(cres, &cfg->hc_resources, hr_next) {
661 if (strcmp(cres->hr_name, nres->hr_name) == 0)
662 break;
663 }
664 PJDLOG_ASSERT(cres != NULL);
665 if (resource_needs_restart(cres, nres)) {
666 pjdlog_info("Resource %s configuration was modified, restarting it.",
667 cres->hr_name);
668 role = cres->hr_role;
669 control_set_role(cres, HAST_ROLE_INIT);
670 TAILQ_REMOVE(&cfg->hc_resources, cres, hr_next);
671 free(cres);
672 TAILQ_REMOVE(&newcfg->hc_resources, nres, hr_next);
673 TAILQ_INSERT_TAIL(&cfg->hc_resources, nres, hr_next);
674 control_set_role(nres, role);
675 } else if (resource_needs_reload(cres, nres)) {
676 pjdlog_info("Resource %s configuration was modified, reloading it.",
677 cres->hr_name);
678 strlcpy(cres->hr_remoteaddr, nres->hr_remoteaddr,
679 sizeof(cres->hr_remoteaddr));
680 strlcpy(cres->hr_sourceaddr, nres->hr_sourceaddr,
681 sizeof(cres->hr_sourceaddr));
682 cres->hr_replication = nres->hr_replication;
683 cres->hr_checksum = nres->hr_checksum;
684 cres->hr_compression = nres->hr_compression;
685 cres->hr_timeout = nres->hr_timeout;
686 strlcpy(cres->hr_exec, nres->hr_exec,
687 sizeof(cres->hr_exec));
688 cres->hr_metaflush = nres->hr_metaflush;
689 if (cres->hr_workerpid != 0)
690 resource_reload(cres);
691 }
692 }
693
694 yy_config_free(newcfg);
695 pjdlog_info("Configuration reloaded successfully.");
696 return;
697 failed:
698 if (newcfg != NULL) {
699 if (newcfg->hc_controlconn != NULL)
700 proto_close(newcfg->hc_controlconn);
701 while ((nlst = TAILQ_FIRST(&newcfg->hc_listen)) != NULL) {
702 if (nlst->hl_conn != NULL) {
703 TAILQ_FOREACH(clst, &cfg->hc_listen, hl_next) {
704 if (strcmp(nlst->hl_addr,
705 clst->hl_addr) == 0) {
706 break;
707 }
708 }
709 if (clst == NULL || clst->hl_conn == NULL)
710 proto_close(nlst->hl_conn);
711 }
712 TAILQ_REMOVE(&newcfg->hc_listen, nlst, hl_next);
713 free(nlst);
714 }
715 yy_config_free(newcfg);
716 }
717 if (newpfh != NULL)
718 (void)pidfile_remove(newpfh);
719 pjdlog_warning("Configuration not reloaded.");
720 }
721
722 static void
terminate_workers(void)723 terminate_workers(void)
724 {
725 struct hast_resource *res;
726
727 pjdlog_info("Termination signal received, exiting.");
728 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
729 if (res->hr_workerpid == 0)
730 continue;
731 pjdlog_info("Terminating worker process (resource=%s, role=%s, pid=%u).",
732 res->hr_name, role2str(res->hr_role), res->hr_workerpid);
733 if (kill(res->hr_workerpid, SIGTERM) == 0)
734 continue;
735 pjdlog_errno(LOG_WARNING,
736 "Unable to send signal to worker process (resource=%s, role=%s, pid=%u).",
737 res->hr_name, role2str(res->hr_role), res->hr_workerpid);
738 }
739 }
740
741 static void
listen_accept(struct hastd_listen * lst)742 listen_accept(struct hastd_listen *lst)
743 {
744 struct hast_resource *res;
745 struct proto_conn *conn;
746 struct nv *nvin, *nvout, *nverr;
747 const char *resname;
748 const unsigned char *token;
749 char laddr[256], raddr[256];
750 uint8_t version;
751 size_t size;
752 pid_t pid;
753 int status;
754
755 proto_local_address(lst->hl_conn, laddr, sizeof(laddr));
756 pjdlog_debug(1, "Accepting connection to %s.", laddr);
757
758 if (proto_accept(lst->hl_conn, &conn) == -1) {
759 pjdlog_errno(LOG_ERR, "Unable to accept connection %s", laddr);
760 return;
761 }
762
763 proto_local_address(conn, laddr, sizeof(laddr));
764 proto_remote_address(conn, raddr, sizeof(raddr));
765 pjdlog_info("Connection from %s to %s.", raddr, laddr);
766
767 /* Error in setting timeout is not critical, but why should it fail? */
768 if (proto_timeout(conn, HAST_TIMEOUT) == -1)
769 pjdlog_errno(LOG_WARNING, "Unable to set connection timeout");
770
771 nvin = nvout = nverr = NULL;
772
773 /*
774 * Before receiving any data see if remote host have access to any
775 * resource.
776 */
777 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
778 if (proto_address_match(conn, res->hr_remoteaddr))
779 break;
780 }
781 if (res == NULL) {
782 pjdlog_error("Client %s isn't known.", raddr);
783 goto close;
784 }
785 /* Ok, remote host can access at least one resource. */
786
787 if (hast_proto_recv_hdr(conn, &nvin) == -1) {
788 pjdlog_errno(LOG_ERR, "Unable to receive header from %s",
789 raddr);
790 goto close;
791 }
792
793 resname = nv_get_string(nvin, "resource");
794 if (resname == NULL) {
795 pjdlog_error("No 'resource' field in the header received from %s.",
796 raddr);
797 goto close;
798 }
799 pjdlog_debug(2, "%s: resource=%s", raddr, resname);
800 version = nv_get_uint8(nvin, "version");
801 pjdlog_debug(2, "%s: version=%hhu", raddr, version);
802 if (version == 0) {
803 /*
804 * If no version is sent, it means this is protocol version 1.
805 */
806 version = 1;
807 }
808 token = nv_get_uint8_array(nvin, &size, "token");
809 /*
810 * NULL token means that this is first connection.
811 */
812 if (token != NULL && size != sizeof(res->hr_token)) {
813 pjdlog_error("Received token of invalid size from %s (expected %zu, got %zu).",
814 raddr, sizeof(res->hr_token), size);
815 goto close;
816 }
817
818 /*
819 * From now on we want to send errors to the remote node.
820 */
821 nverr = nv_alloc();
822
823 /* Find resource related to this connection. */
824 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
825 if (strcmp(resname, res->hr_name) == 0)
826 break;
827 }
828 /* Have we found the resource? */
829 if (res == NULL) {
830 pjdlog_error("No resource '%s' as requested by %s.",
831 resname, raddr);
832 nv_add_stringf(nverr, "errmsg", "Resource not configured.");
833 goto fail;
834 }
835
836 /* Now that we know resource name setup log prefix. */
837 pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role));
838
839 /* Does the remote host have access to this resource? */
840 if (!proto_address_match(conn, res->hr_remoteaddr)) {
841 pjdlog_error("Client %s has no access to the resource.", raddr);
842 nv_add_stringf(nverr, "errmsg", "No access to the resource.");
843 goto fail;
844 }
845 /* Is the resource marked as secondary? */
846 if (res->hr_role != HAST_ROLE_SECONDARY) {
847 pjdlog_warning("We act as %s for the resource and not as %s as requested by %s.",
848 role2str(res->hr_role), role2str(HAST_ROLE_SECONDARY),
849 raddr);
850 nv_add_stringf(nverr, "errmsg",
851 "Remote node acts as %s for the resource and not as %s.",
852 role2str(res->hr_role), role2str(HAST_ROLE_SECONDARY));
853 if (res->hr_role == HAST_ROLE_PRIMARY) {
854 /*
855 * If we act as primary request the other side to wait
856 * for us a bit, as we might be finishing cleanups.
857 */
858 nv_add_uint8(nverr, 1, "wait");
859 }
860 goto fail;
861 }
862 /* Does token (if exists) match? */
863 if (token != NULL && memcmp(token, res->hr_token,
864 sizeof(res->hr_token)) != 0) {
865 pjdlog_error("Token received from %s doesn't match.", raddr);
866 nv_add_stringf(nverr, "errmsg", "Token doesn't match.");
867 goto fail;
868 }
869 /*
870 * If there is no token, but we have half-open connection
871 * (only remotein) or full connection (worker process is running)
872 * we have to cancel those and accept the new connection.
873 */
874 if (token == NULL) {
875 PJDLOG_ASSERT(res->hr_remoteout == NULL);
876 pjdlog_debug(1, "Initial connection from %s.", raddr);
877 if (res->hr_workerpid != 0) {
878 PJDLOG_ASSERT(res->hr_remotein == NULL);
879 pjdlog_debug(1,
880 "Worker process exists (pid=%u), stopping it.",
881 (unsigned int)res->hr_workerpid);
882 /* Stop child process. */
883 if (kill(res->hr_workerpid, SIGINT) == -1) {
884 pjdlog_errno(LOG_ERR,
885 "Unable to stop worker process (pid=%u)",
886 (unsigned int)res->hr_workerpid);
887 /*
888 * Other than logging the problem we
889 * ignore it - nothing smart to do.
890 */
891 }
892 /* Wait for it to exit. */
893 else if ((pid = waitpid(res->hr_workerpid,
894 &status, 0)) != res->hr_workerpid) {
895 /* We can only log the problem. */
896 pjdlog_errno(LOG_ERR,
897 "Waiting for worker process (pid=%u) failed",
898 (unsigned int)res->hr_workerpid);
899 } else {
900 child_exit_log(res->hr_workerpid, status);
901 }
902 child_cleanup(res);
903 } else if (res->hr_remotein != NULL) {
904 char oaddr[256];
905
906 proto_remote_address(res->hr_remotein, oaddr,
907 sizeof(oaddr));
908 pjdlog_debug(1,
909 "Canceling half-open connection from %s on connection from %s.",
910 oaddr, raddr);
911 proto_close(res->hr_remotein);
912 res->hr_remotein = NULL;
913 }
914 }
915
916 /*
917 * Checks and cleanups are done.
918 */
919
920 if (token == NULL) {
921 if (version > HAST_PROTO_VERSION) {
922 pjdlog_info("Remote protocol version %hhu is not supported, falling back to version %hhu.",
923 version, (unsigned char)HAST_PROTO_VERSION);
924 version = HAST_PROTO_VERSION;
925 }
926 pjdlog_debug(1, "Negotiated protocol version %hhu.", version);
927 res->hr_version = version;
928 arc4random_buf(res->hr_token, sizeof(res->hr_token));
929 nvout = nv_alloc();
930 nv_add_uint8(nvout, version, "version");
931 nv_add_uint8_array(nvout, res->hr_token,
932 sizeof(res->hr_token), "token");
933 if (nv_error(nvout) != 0) {
934 pjdlog_common(LOG_ERR, 0, nv_error(nvout),
935 "Unable to prepare return header for %s", raddr);
936 nv_add_stringf(nverr, "errmsg",
937 "Remote node was unable to prepare return header: %s.",
938 strerror(nv_error(nvout)));
939 goto fail;
940 }
941 if (hast_proto_send(res, conn, nvout, NULL, 0) == -1) {
942 int error = errno;
943
944 pjdlog_errno(LOG_ERR, "Unable to send response to %s",
945 raddr);
946 nv_add_stringf(nverr, "errmsg",
947 "Remote node was unable to send response: %s.",
948 strerror(error));
949 goto fail;
950 }
951 res->hr_remotein = conn;
952 pjdlog_debug(1, "Incoming connection from %s configured.",
953 raddr);
954 } else {
955 res->hr_remoteout = conn;
956 pjdlog_debug(1, "Outgoing connection to %s configured.", raddr);
957 hastd_secondary(res, nvin);
958 }
959 nv_free(nvin);
960 nv_free(nvout);
961 nv_free(nverr);
962 pjdlog_prefix_set("%s", "");
963 return;
964 fail:
965 if (nv_error(nverr) != 0) {
966 pjdlog_common(LOG_ERR, 0, nv_error(nverr),
967 "Unable to prepare error header for %s", raddr);
968 goto close;
969 }
970 if (hast_proto_send(NULL, conn, nverr, NULL, 0) == -1) {
971 pjdlog_errno(LOG_ERR, "Unable to send error to %s", raddr);
972 goto close;
973 }
974 close:
975 if (nvin != NULL)
976 nv_free(nvin);
977 if (nvout != NULL)
978 nv_free(nvout);
979 if (nverr != NULL)
980 nv_free(nverr);
981 proto_close(conn);
982 pjdlog_prefix_set("%s", "");
983 }
984
985 static void
connection_migrate(struct hast_resource * res)986 connection_migrate(struct hast_resource *res)
987 {
988 struct proto_conn *conn;
989 int16_t val = 0;
990
991 pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role));
992
993 PJDLOG_ASSERT(res->hr_role == HAST_ROLE_PRIMARY);
994
995 if (proto_recv(res->hr_conn, &val, sizeof(val)) == -1) {
996 pjdlog_errno(LOG_WARNING,
997 "Unable to receive connection command");
998 return;
999 }
1000 if (proto_client(res->hr_sourceaddr[0] != '\0' ? res->hr_sourceaddr : NULL,
1001 res->hr_remoteaddr, &conn) == -1) {
1002 val = errno;
1003 pjdlog_errno(LOG_WARNING,
1004 "Unable to create outgoing connection to %s",
1005 res->hr_remoteaddr);
1006 goto out;
1007 }
1008 if (proto_connect(conn, -1) == -1) {
1009 val = errno;
1010 pjdlog_errno(LOG_WARNING, "Unable to connect to %s",
1011 res->hr_remoteaddr);
1012 proto_close(conn);
1013 goto out;
1014 }
1015 val = 0;
1016 out:
1017 if (proto_send(res->hr_conn, &val, sizeof(val)) == -1) {
1018 pjdlog_errno(LOG_WARNING,
1019 "Unable to send reply to connection request");
1020 }
1021 if (val == 0 && proto_connection_send(res->hr_conn, conn) == -1)
1022 pjdlog_errno(LOG_WARNING, "Unable to send connection");
1023
1024 pjdlog_prefix_set("%s", "");
1025 }
1026
1027 static void
check_signals(void)1028 check_signals(void)
1029 {
1030 struct timespec sigtimeout;
1031 sigset_t mask;
1032 int signo;
1033
1034 sigtimeout.tv_sec = 0;
1035 sigtimeout.tv_nsec = 0;
1036
1037 PJDLOG_VERIFY(sigemptyset(&mask) == 0);
1038 PJDLOG_VERIFY(sigaddset(&mask, SIGHUP) == 0);
1039 PJDLOG_VERIFY(sigaddset(&mask, SIGINT) == 0);
1040 PJDLOG_VERIFY(sigaddset(&mask, SIGTERM) == 0);
1041 PJDLOG_VERIFY(sigaddset(&mask, SIGCHLD) == 0);
1042
1043 while ((signo = sigtimedwait(&mask, NULL, &sigtimeout)) != -1) {
1044 switch (signo) {
1045 case SIGINT:
1046 case SIGTERM:
1047 sigexit_received = true;
1048 terminate_workers();
1049 proto_close(cfg->hc_controlconn);
1050 exit(EX_OK);
1051 break;
1052 case SIGCHLD:
1053 child_exit();
1054 break;
1055 case SIGHUP:
1056 hastd_reload();
1057 break;
1058 default:
1059 PJDLOG_ABORT("Unexpected signal (%d).", signo);
1060 }
1061 }
1062 }
1063
1064 static void
main_loop(void)1065 main_loop(void)
1066 {
1067 struct hast_resource *res;
1068 struct hastd_listen *lst;
1069 struct timeval seltimeout;
1070 int fd, maxfd, ret;
1071 time_t lastcheck, now;
1072 fd_set rfds;
1073
1074 lastcheck = time(NULL);
1075 seltimeout.tv_sec = REPORT_INTERVAL;
1076 seltimeout.tv_usec = 0;
1077
1078 for (;;) {
1079 check_signals();
1080
1081 /* Setup descriptors for select(2). */
1082 FD_ZERO(&rfds);
1083 maxfd = fd = proto_descriptor(cfg->hc_controlconn);
1084 PJDLOG_ASSERT(fd >= 0);
1085 FD_SET(fd, &rfds);
1086 TAILQ_FOREACH(lst, &cfg->hc_listen, hl_next) {
1087 if (lst->hl_conn == NULL)
1088 continue;
1089 fd = proto_descriptor(lst->hl_conn);
1090 PJDLOG_ASSERT(fd >= 0);
1091 FD_SET(fd, &rfds);
1092 maxfd = MAX(fd, maxfd);
1093 }
1094 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
1095 if (res->hr_event == NULL)
1096 continue;
1097 fd = proto_descriptor(res->hr_event);
1098 PJDLOG_ASSERT(fd >= 0);
1099 FD_SET(fd, &rfds);
1100 maxfd = MAX(fd, maxfd);
1101 if (res->hr_role == HAST_ROLE_PRIMARY) {
1102 /* Only primary workers asks for connections. */
1103 PJDLOG_ASSERT(res->hr_conn != NULL);
1104 fd = proto_descriptor(res->hr_conn);
1105 PJDLOG_ASSERT(fd >= 0);
1106 FD_SET(fd, &rfds);
1107 maxfd = MAX(fd, maxfd);
1108 } else {
1109 PJDLOG_ASSERT(res->hr_conn == NULL);
1110 }
1111 }
1112
1113 PJDLOG_ASSERT(maxfd + 1 <= (int)FD_SETSIZE);
1114 ret = select(maxfd + 1, &rfds, NULL, NULL, &seltimeout);
1115 now = time(NULL);
1116 if (lastcheck + REPORT_INTERVAL <= now) {
1117 hook_check();
1118 lastcheck = now;
1119 }
1120 if (ret == 0) {
1121 /*
1122 * select(2) timed out, so there should be no
1123 * descriptors to check.
1124 */
1125 continue;
1126 } else if (ret == -1) {
1127 if (errno == EINTR)
1128 continue;
1129 KEEP_ERRNO((void)pidfile_remove(pfh));
1130 pjdlog_exit(EX_OSERR, "select() failed");
1131 }
1132
1133 /*
1134 * Check for signals before we do anything to update our
1135 * info about terminated workers in the meantime.
1136 */
1137 check_signals();
1138
1139 if (FD_ISSET(proto_descriptor(cfg->hc_controlconn), &rfds))
1140 control_handle(cfg);
1141 TAILQ_FOREACH(lst, &cfg->hc_listen, hl_next) {
1142 if (lst->hl_conn == NULL)
1143 continue;
1144 if (FD_ISSET(proto_descriptor(lst->hl_conn), &rfds))
1145 listen_accept(lst);
1146 }
1147 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
1148 if (res->hr_event == NULL)
1149 continue;
1150 if (FD_ISSET(proto_descriptor(res->hr_event), &rfds)) {
1151 if (event_recv(res) == 0)
1152 continue;
1153 /* The worker process exited? */
1154 proto_close(res->hr_event);
1155 res->hr_event = NULL;
1156 if (res->hr_conn != NULL) {
1157 proto_close(res->hr_conn);
1158 res->hr_conn = NULL;
1159 }
1160 continue;
1161 }
1162 if (res->hr_role == HAST_ROLE_PRIMARY) {
1163 PJDLOG_ASSERT(res->hr_conn != NULL);
1164 if (FD_ISSET(proto_descriptor(res->hr_conn),
1165 &rfds)) {
1166 connection_migrate(res);
1167 }
1168 } else {
1169 PJDLOG_ASSERT(res->hr_conn == NULL);
1170 }
1171 }
1172 }
1173 }
1174
1175 static void
dummy_sighandler(int sig __unused)1176 dummy_sighandler(int sig __unused)
1177 {
1178 /* Nothing to do. */
1179 }
1180
1181 int
main(int argc,char * argv[])1182 main(int argc, char *argv[])
1183 {
1184 struct hastd_listen *lst;
1185 pid_t otherpid;
1186 int debuglevel;
1187 sigset_t mask;
1188
1189 foreground = false;
1190 debuglevel = 0;
1191
1192 for (;;) {
1193 int ch;
1194
1195 ch = getopt(argc, argv, "c:dFhP:");
1196 if (ch == -1)
1197 break;
1198 switch (ch) {
1199 case 'c':
1200 cfgpath = optarg;
1201 break;
1202 case 'd':
1203 debuglevel++;
1204 break;
1205 case 'F':
1206 foreground = true;
1207 break;
1208 case 'P':
1209 pidfile = optarg;
1210 break;
1211 case 'h':
1212 default:
1213 usage();
1214 }
1215 }
1216 argc -= optind;
1217 argv += optind;
1218
1219 pjdlog_init(PJDLOG_MODE_STD);
1220 pjdlog_debug_set(debuglevel);
1221
1222 closefrom(MAX(MAX(STDIN_FILENO, STDOUT_FILENO), STDERR_FILENO) + 1);
1223 g_gate_load();
1224
1225 /*
1226 * When path to the configuration file is relative, obtain full path,
1227 * so we can always find the file, even after daemonizing and changing
1228 * working directory to /.
1229 */
1230 if (cfgpath[0] != '/') {
1231 const char *newcfgpath;
1232
1233 newcfgpath = realpath(cfgpath, NULL);
1234 if (newcfgpath == NULL) {
1235 pjdlog_exit(EX_CONFIG,
1236 "Unable to obtain full path of %s", cfgpath);
1237 }
1238 cfgpath = newcfgpath;
1239 }
1240
1241 cfg = yy_config_parse(cfgpath, true);
1242 PJDLOG_ASSERT(cfg != NULL);
1243
1244 if (pidfile != NULL) {
1245 if (strlcpy(cfg->hc_pidfile, pidfile,
1246 sizeof(cfg->hc_pidfile)) >= sizeof(cfg->hc_pidfile)) {
1247 pjdlog_exitx(EX_CONFIG, "Pidfile path is too long.");
1248 }
1249 }
1250
1251 if (pidfile != NULL || !foreground) {
1252 pfh = pidfile_open(cfg->hc_pidfile, 0600, &otherpid);
1253 if (pfh == NULL) {
1254 if (errno == EEXIST) {
1255 pjdlog_exitx(EX_TEMPFAIL,
1256 "Another hastd is already running, pidfile: %s, pid: %jd.",
1257 cfg->hc_pidfile, (intmax_t)otherpid);
1258 }
1259 /*
1260 * If we cannot create pidfile for other reasons,
1261 * only warn.
1262 */
1263 pjdlog_errno(LOG_WARNING,
1264 "Unable to open or create pidfile %s",
1265 cfg->hc_pidfile);
1266 }
1267 }
1268
1269 /*
1270 * Restore default actions for interesting signals in case parent
1271 * process (like init(8)) decided to ignore some of them (like SIGHUP).
1272 */
1273 PJDLOG_VERIFY(signal(SIGHUP, SIG_DFL) != SIG_ERR);
1274 PJDLOG_VERIFY(signal(SIGINT, SIG_DFL) != SIG_ERR);
1275 PJDLOG_VERIFY(signal(SIGTERM, SIG_DFL) != SIG_ERR);
1276 /*
1277 * Because SIGCHLD is ignored by default, setup dummy handler for it,
1278 * so we can mask it.
1279 */
1280 PJDLOG_VERIFY(signal(SIGCHLD, dummy_sighandler) != SIG_ERR);
1281
1282 PJDLOG_VERIFY(sigemptyset(&mask) == 0);
1283 PJDLOG_VERIFY(sigaddset(&mask, SIGHUP) == 0);
1284 PJDLOG_VERIFY(sigaddset(&mask, SIGINT) == 0);
1285 PJDLOG_VERIFY(sigaddset(&mask, SIGTERM) == 0);
1286 PJDLOG_VERIFY(sigaddset(&mask, SIGCHLD) == 0);
1287 PJDLOG_VERIFY(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
1288
1289 /* Listen on control address. */
1290 if (proto_server(cfg->hc_controladdr, &cfg->hc_controlconn) == -1) {
1291 KEEP_ERRNO((void)pidfile_remove(pfh));
1292 pjdlog_exit(EX_OSERR, "Unable to listen on control address %s",
1293 cfg->hc_controladdr);
1294 }
1295 /* Listen for remote connections. */
1296 TAILQ_FOREACH(lst, &cfg->hc_listen, hl_next) {
1297 if (proto_server(lst->hl_addr, &lst->hl_conn) == -1) {
1298 KEEP_ERRNO((void)pidfile_remove(pfh));
1299 pjdlog_exit(EX_OSERR, "Unable to listen on address %s",
1300 lst->hl_addr);
1301 }
1302 }
1303
1304 if (!foreground) {
1305 if (daemon(0, 0) == -1) {
1306 KEEP_ERRNO((void)pidfile_remove(pfh));
1307 pjdlog_exit(EX_OSERR, "Unable to daemonize");
1308 }
1309
1310 /* Start logging to syslog. */
1311 pjdlog_mode_set(PJDLOG_MODE_SYSLOG);
1312 }
1313 if (pidfile != NULL || !foreground) {
1314 /* Write PID to a file. */
1315 if (pidfile_write(pfh) == -1) {
1316 pjdlog_errno(LOG_WARNING,
1317 "Unable to write PID to a file %s",
1318 cfg->hc_pidfile);
1319 } else {
1320 pjdlog_debug(1, "PID stored in %s.", cfg->hc_pidfile);
1321 }
1322 }
1323
1324 pjdlog_info("Started successfully, running protocol version %d.",
1325 HAST_PROTO_VERSION);
1326
1327 pjdlog_debug(1, "Listening on control address %s.",
1328 cfg->hc_controladdr);
1329 TAILQ_FOREACH(lst, &cfg->hc_listen, hl_next)
1330 pjdlog_info("Listening on address %s.", lst->hl_addr);
1331
1332 hook_init();
1333
1334 main_loop();
1335
1336 exit(0);
1337 }
1338