sbin/hastd/hastd.c

   1 /*-
   2  * Copyright (c) 2009-2010 The FreeBSD Foundation
   3  * Copyright (c) 2010-2011 Pawel Jakub Dawidek <pawel@dawidek.net>
   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/stat.h>
  38 #include <sys/wait.h>
  39
  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 <time.h>
  50 #include <unistd.h>
  51
  52 #include <activemap.h>
  53 #include <pjdlog.h>
  54
  55 #include "control.h"
  56 #include "event.h"
  57 #include "hast.h"
  58 #include "hast_proto.h"
  59 #include "hastd.h"
  60 #include "hooks.h"
  61 #include "subr.h"
  62
  63 /* Path to configuration file. */
  64 const char *cfgpath = HAST_CONFIG;
  65 /* Hastd configuration. */
  66 static struct hastd_config *cfg;
  67 /* Was SIGINT or SIGTERM signal received? */
  68 bool sigexit_received = false;
  69 /* Path to pidfile. */
  70 static const char *pidfile;
  71 /* Pidfile handle. */
  72 struct pidfh *pfh;
  73 /* Do we run in foreground? */
  74 static bool foreground;
  75
  76 /* How often check for hooks running for too long. */
  77 #define REPORT_INTERVAL 5
  78
  79 static void
  80 usage(void)
  81 {
  82
  83         errx(EX_USAGE, "[-dFh] [-c config] [-P pidfile]");
  84 }
  85
  86 static void
  87 g_gate_load(void)
  88 {
  89
  90         if (modfind("g_gate") == -1) {
  91                 /* Not present in kernel, try loading it. */
  92                 if (kldload("geom_gate") == -1 || modfind("g_gate") == -1) {
  93                         if (errno != EEXIST) {
  94                                 pjdlog_exit(EX_OSERR,
  95                                     "Unable to load geom_gate module");
  96                         }
  97                 }
  98         }
  99 }
 100
 101 void
 102 descriptors_cleanup(struct hast_resource *res)
 103 {
 104         struct hast_resource *tres, *tmres;
 105         struct hastd_listen *lst;
 106
 107         TAILQ_FOREACH_SAFE(tres, &cfg->hc_resources, hr_next, tmres) {
 108                 if (tres == res) {
 109                         PJDLOG_VERIFY(res->hr_role == HAST_ROLE_SECONDARY ||
 110                             (res->hr_remotein == NULL &&
 111                              res->hr_remoteout == NULL));
 112                         continue;
 113                 }
 114                 if (tres->hr_remotein != NULL)
 115                         proto_close(tres->hr_remotein);
 116                 if (tres->hr_remoteout != NULL)
 117                         proto_close(tres->hr_remoteout);
 118                 if (tres->hr_ctrl != NULL)
 119                         proto_close(tres->hr_ctrl);
 120                 if (tres->hr_event != NULL)
 121                         proto_close(tres->hr_event);
 122                 if (tres->hr_conn != NULL)
 123                         proto_close(tres->hr_conn);
 124                 TAILQ_REMOVE(&cfg->hc_resources, tres, hr_next);
 125                 free(tres);
 126         }
 127         if (cfg->hc_controlin != NULL)
 128                 proto_close(cfg->hc_controlin);
 129         proto_close(cfg->hc_controlconn);
 130         while ((lst = TAILQ_FIRST(&cfg->hc_listen)) != NULL) {
 131                 TAILQ_REMOVE(&cfg->hc_listen, lst, hl_next);
 132                 if (lst->hl_conn != NULL)
 133                         proto_close(lst->hl_conn);
 134                 free(lst);
 135         }
 136         (void)pidfile_close(pfh);
 137         hook_fini();
 138         pjdlog_fini();
 139 }
 140
 141 static const char *
 142 dtype2str(mode_t mode)
 143 {
 144
 145         if (S_ISBLK(mode))
 146                 return ("block device");
 147         else if (S_ISCHR(mode))
 148                 return ("character device");
 149         else if (S_ISDIR(mode))
 150                 return ("directory");
 151         else if (S_ISFIFO(mode))
 152                 return ("pipe or FIFO");
 153         else if (S_ISLNK(mode))
 154                 return ("symbolic link");
 155         else if (S_ISREG(mode))
 156                 return ("regular file");
 157         else if (S_ISSOCK(mode))
 158                 return ("socket");
 159         else if (S_ISWHT(mode))
 160                 return ("whiteout");
 161         else
 162                 return ("unknown");
 163 }
 164
 165 void
 166 descriptors_assert(const struct hast_resource *res, int pjdlogmode)
 167 {
 168         char msg[256];
 169         struct stat sb;
 170         long maxfd;
 171         bool isopen;
 172         mode_t mode;
 173         int fd;
 174
 175         /*
 176          * At this point descriptor to syslog socket is closed, so if we want
 177          * to log assertion message, we have to first store it in 'msg' local
 178          * buffer and then open syslog socket and log it.
 179          */
 180         msg[0] = '\0';
 181
 182         maxfd = sysconf(_SC_OPEN_MAX);
 183         if (maxfd == -1) {
 184                 pjdlog_init(pjdlogmode);
 185                 pjdlog_prefix_set("[%s] (%s) ", res->hr_name,
 186                     role2str(res->hr_role));
 187                 pjdlog_errno(LOG_WARNING, "sysconf(_SC_OPEN_MAX) failed");
 188                 pjdlog_fini();
 189                 maxfd = 16384;
 190         }
 191         for (fd = 0; fd <= maxfd; fd++) {
 192                 if (fstat(fd, &sb) == 0) {
 193                         isopen = true;
 194                         mode = sb.st_mode;
 195                 } else if (errno == EBADF) {
 196                         isopen = false;
 197                         mode = 0;
 198                 } else {
 199                         (void)snprintf(msg, sizeof(msg),
 200                             "Unable to fstat descriptor %d: %s", fd,
 201                             strerror(errno));
 202                         break;
 203                 }
 204                 if (fd == STDIN_FILENO || fd == STDOUT_FILENO ||
 205                     fd == STDERR_FILENO) {
 206                         if (!isopen) {
 207                                 (void)snprintf(msg, sizeof(msg),
 208                                     "Descriptor %d (%s) is closed, but should be open.",
 209                                     fd, (fd == STDIN_FILENO ? "stdin" :
 210                                     (fd == STDOUT_FILENO ? "stdout" : "stderr")));
 211                                 break;
 212                         }
 213                 } else if (fd == proto_descriptor(res->hr_event)) {
 214                         if (!isopen) {
 215                                 (void)snprintf(msg, sizeof(msg),
 216                                     "Descriptor %d (event) is closed, but should be open.",
 217                                     fd);
 218                                 break;
 219                         }
 220                         if (!S_ISSOCK(mode)) {
 221                                 (void)snprintf(msg, sizeof(msg),
 222                                     "Descriptor %d (event) is %s, but should be %s.",
 223                                     fd, dtype2str(mode), dtype2str(S_IFSOCK));
 224                                 break;
 225                         }
 226                 } else if (fd == proto_descriptor(res->hr_ctrl)) {
 227                         if (!isopen) {
 228                                 (void)snprintf(msg, sizeof(msg),
 229                                     "Descriptor %d (ctrl) is closed, but should be open.",
 230                                     fd);
 231                                 break;
 232                         }
 233                         if (!S_ISSOCK(mode)) {
 234                                 (void)snprintf(msg, sizeof(msg),
 235                                     "Descriptor %d (ctrl) is %s, but should be %s.",
 236                                     fd, dtype2str(mode), dtype2str(S_IFSOCK));
 237                                 break;
 238                         }
 239                 } else if (res->hr_role == HAST_ROLE_PRIMARY &&
 240                     fd == proto_descriptor(res->hr_conn)) {
 241                         if (!isopen) {
 242                                 (void)snprintf(msg, sizeof(msg),
 243                                     "Descriptor %d (conn) is closed, but should be open.",
 244                                     fd);
 245                                 break;
 246                         }
 247                         if (!S_ISSOCK(mode)) {
 248                                 (void)snprintf(msg, sizeof(msg),
 249                                     "Descriptor %d (conn) is %s, but should be %s.",
 250                                     fd, dtype2str(mode), dtype2str(S_IFSOCK));
 251                                 break;
 252                         }
 253                 } else if (res->hr_role == HAST_ROLE_SECONDARY &&
 254                     res->hr_conn != NULL &&
 255                     fd == proto_descriptor(res->hr_conn)) {
 256                         if (isopen) {
 257                                 (void)snprintf(msg, sizeof(msg),
 258                                     "Descriptor %d (conn) is open, but should be closed.",
 259                                     fd);
 260                                 break;
 261                         }
 262                 } else if (res->hr_role == HAST_ROLE_SECONDARY &&
 263                     fd == proto_descriptor(res->hr_remotein)) {
 264                         if (!isopen) {
 265                                 (void)snprintf(msg, sizeof(msg),
 266                                     "Descriptor %d (remote in) is closed, but should be open.",
 267                                     fd);
 268                                 break;
 269                         }
 270                         if (!S_ISSOCK(mode)) {
 271                                 (void)snprintf(msg, sizeof(msg),
 272                                     "Descriptor %d (remote in) is %s, but should be %s.",
 273                                     fd, dtype2str(mode), dtype2str(S_IFSOCK));
 274                                 break;
 275                         }
 276                 } else if (res->hr_role == HAST_ROLE_SECONDARY &&
 277                     fd == proto_descriptor(res->hr_remoteout)) {
 278                         if (!isopen) {
 279                                 (void)snprintf(msg, sizeof(msg),
 280                                     "Descriptor %d (remote out) is closed, but should be open.",
 281                                     fd);
 282                                 break;
 283                         }
 284                         if (!S_ISSOCK(mode)) {
 285                                 (void)snprintf(msg, sizeof(msg),
 286                                     "Descriptor %d (remote out) is %s, but should be %s.",
 287                                     fd, dtype2str(mode), dtype2str(S_IFSOCK));
 288                                 break;
 289                         }
 290                 } else {
 291                         if (isopen) {
 292                                 (void)snprintf(msg, sizeof(msg),
 293                                     "Descriptor %d is open (%s), but should be closed.",
 294                                     fd, dtype2str(mode));
 295                                 break;
 296                         }
 297                 }
 298         }
 299         if (msg[0] != '\0') {
 300                 pjdlog_init(pjdlogmode);
 301                 pjdlog_prefix_set("[%s] (%s) ", res->hr_name,
 302                     role2str(res->hr_role));
 303                 PJDLOG_ABORT("%s", msg);
 304         }
 305 }
 306
 307 static void
 308 child_exit_log(unsigned int pid, int status)
 309 {
 310
 311         if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
 312                 pjdlog_debug(1, "Worker process exited gracefully (pid=%u).",
 313                     pid);
 314         } else if (WIFSIGNALED(status)) {
 315                 pjdlog_error("Worker process killed (pid=%u, signal=%d).",
 316                     pid, WTERMSIG(status));
 317         } else {
 318                 pjdlog_error("Worker process exited ungracefully (pid=%u, exitcode=%d).",
 319                     pid, WIFEXITED(status) ? WEXITSTATUS(status) : -1);
 320         }
 321 }
 322
 323 static void
 324 child_exit(void)
 325 {
 326         struct hast_resource *res;
 327         int status;
 328         pid_t pid;
 329
 330         while ((pid = wait3(&status, WNOHANG, NULL)) > 0) {
 331                 /* Find resource related to the process that just exited. */
 332                 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
 333                         if (pid == res->hr_workerpid)
 334                                 break;
 335                 }
 336                 if (res == NULL) {
 337                         /*
 338                          * This can happen when new connection arrives and we
 339                          * cancel child responsible for the old one or if this
 340                          * was hook which we executed.
 341                          */
 342                         hook_check_one(pid, status);
 343                         continue;
 344                 }
 345                 pjdlog_prefix_set("[%s] (%s) ", res->hr_name,
 346                     role2str(res->hr_role));
 347                 child_exit_log(pid, status);
 348                 child_cleanup(res);
 349                 if (res->hr_role == HAST_ROLE_PRIMARY) {
 350                         /*
 351                          * Restart child process if it was killed by signal
 352                          * or exited because of temporary problem.
 353                          */
 354                         if (WIFSIGNALED(status) ||
 355                             (WIFEXITED(status) &&
 356                              WEXITSTATUS(status) == EX_TEMPFAIL)) {
 357                                 sleep(1);
 358                                 pjdlog_info("Restarting worker process.");
 359                                 hastd_primary(res);
 360                         } else {
 361                                 res->hr_role = HAST_ROLE_INIT;
 362                                 pjdlog_info("Changing resource role back to %s.",
 363                                     role2str(res->hr_role));
 364                         }
 365                 }
 366                 pjdlog_prefix_set("%s", "");
 367         }
 368 }
 369
 370 static bool
 371 resource_needs_restart(const struct hast_resource *res0,
 372     const struct hast_resource *res1)
 373 {
 374
 375         PJDLOG_ASSERT(strcmp(res0->hr_name, res1->hr_name) == 0);
 376
 377         if (strcmp(res0->hr_provname, res1->hr_provname) != 0)
 378                 return (true);
 379         if (strcmp(res0->hr_localpath, res1->hr_localpath) != 0)
 380                 return (true);
 381         if (res0->hr_role == HAST_ROLE_INIT ||
 382             res0->hr_role == HAST_ROLE_SECONDARY) {
 383                 if (strcmp(res0->hr_remoteaddr, res1->hr_remoteaddr) != 0)
 384                         return (true);
 385                 if (strcmp(res0->hr_sourceaddr, res1->hr_sourceaddr) != 0)
 386                         return (true);
 387                 if (res0->hr_replication != res1->hr_replication)
 388                         return (true);
 389                 if (res0->hr_checksum != res1->hr_checksum)
 390                         return (true);
 391                 if (res0->hr_compression != res1->hr_compression)
 392                         return (true);
 393                 if (res0->hr_timeout != res1->hr_timeout)
 394                         return (true);
 395                 if (strcmp(res0->hr_exec, res1->hr_exec) != 0)
 396                         return (true);
 397                 /*
 398                  * When metaflush has changed we don't really need restart,
 399                  * but it is just easier this way.
 400                  */
 401                 if (res0->hr_metaflush != res1->hr_metaflush)
 402                         return (true);
 403         }
 404         return (false);
 405 }
 406
 407 static bool
 408 resource_needs_reload(const struct hast_resource *res0,
 409     const struct hast_resource *res1)
 410 {
 411
 412         PJDLOG_ASSERT(strcmp(res0->hr_name, res1->hr_name) == 0);
 413         PJDLOG_ASSERT(strcmp(res0->hr_provname, res1->hr_provname) == 0);
 414         PJDLOG_ASSERT(strcmp(res0->hr_localpath, res1->hr_localpath) == 0);
 415
 416         if (res0->hr_role != HAST_ROLE_PRIMARY)
 417                 return (false);
 418
 419         if (strcmp(res0->hr_remoteaddr, res1->hr_remoteaddr) != 0)
 420                 return (true);
 421         if (strcmp(res0->hr_sourceaddr, res1->hr_sourceaddr) != 0)
 422                 return (true);
 423         if (res0->hr_replication != res1->hr_replication)
 424                 return (true);
 425         if (res0->hr_checksum != res1->hr_checksum)
 426                 return (true);
 427         if (res0->hr_compression != res1->hr_compression)
 428                 return (true);
 429         if (res0->hr_timeout != res1->hr_timeout)
 430                 return (true);
 431         if (strcmp(res0->hr_exec, res1->hr_exec) != 0)
 432                 return (true);
 433         if (res0->hr_metaflush != res1->hr_metaflush)
 434                 return (true);
 435         return (false);
 436 }
 437
 438 static void
 439 resource_reload(const struct hast_resource *res)
 440 {
 441         struct nv *nvin, *nvout;
 442         int error;
 443
 444         PJDLOG_ASSERT(res->hr_role == HAST_ROLE_PRIMARY);
 445
 446         nvout = nv_alloc();
 447         nv_add_uint8(nvout, CONTROL_RELOAD, "cmd");
 448         nv_add_string(nvout, res->hr_remoteaddr, "remoteaddr");
 449         nv_add_string(nvout, res->hr_sourceaddr, "sourceaddr");
 450         nv_add_int32(nvout, (int32_t)res->hr_replication, "replication");
 451         nv_add_int32(nvout, (int32_t)res->hr_checksum, "checksum");
 452         nv_add_int32(nvout, (int32_t)res->hr_compression, "compression");
 453         nv_add_int32(nvout, (int32_t)res->hr_timeout, "timeout");
 454         nv_add_string(nvout, res->hr_exec, "exec");
 455         nv_add_int32(nvout, (int32_t)res->hr_metaflush, "metaflush");
 456         if (nv_error(nvout) != 0) {
 457                 nv_free(nvout);
 458                 pjdlog_error("Unable to allocate header for reload message.");
 459                 return;
 460         }
 461         if (hast_proto_send(res, res->hr_ctrl, nvout, NULL, 0) == -1) {
 462                 pjdlog_errno(LOG_ERR, "Unable to send reload message");
 463                 nv_free(nvout);
 464                 return;
 465         }
 466         nv_free(nvout);
 467
 468         /* Receive response. */
 469         if (hast_proto_recv_hdr(res->hr_ctrl, &nvin) == -1) {
 470                 pjdlog_errno(LOG_ERR, "Unable to receive reload reply");
 471                 return;
 472         }
 473         error = nv_get_int16(nvin, "error");
 474         nv_free(nvin);
 475         if (error != 0) {
 476                 pjdlog_common(LOG_ERR, 0, error, "Reload failed");
 477                 return;
 478         }
 479 }
 480
 481 static void
 482 hastd_reload(void)
 483 {
 484         struct hastd_config *newcfg;
 485         struct hast_resource *nres, *cres, *tres;
 486         struct hastd_listen *nlst, *clst;
 487         struct pidfh *newpfh;
 488         unsigned int nlisten;
 489         uint8_t role;
 490         pid_t otherpid;
 491
 492         pjdlog_info("Reloading configuration...");
 493
 494         newpfh = NULL;
 495
 496         newcfg = yy_config_parse(cfgpath, false);
 497         if (newcfg == NULL)
 498                 goto failed;
 499
 500         /*
 501          * Check if control address has changed.
 502          */
 503         if (strcmp(cfg->hc_controladdr, newcfg->hc_controladdr) != 0) {
 504                 if (proto_server(newcfg->hc_controladdr,
 505                     &newcfg->hc_controlconn) == -1) {
 506                         pjdlog_errno(LOG_ERR,
 507                             "Unable to listen on control address %s",
 508                             newcfg->hc_controladdr);
 509                         goto failed;
 510                 }
 511         }
 512         /*
 513          * Check if any listen address has changed.
 514          */
 515         nlisten = 0;
 516         TAILQ_FOREACH(nlst, &newcfg->hc_listen, hl_next) {
 517                 TAILQ_FOREACH(clst, &cfg->hc_listen, hl_next) {
 518                         if (strcmp(nlst->hl_addr, clst->hl_addr) == 0)
 519                                 break;
 520                 }
 521                 if (clst != NULL && clst->hl_conn != NULL) {
 522                         pjdlog_info("Keep listening on address %s.",
 523                             nlst->hl_addr);
 524                         nlst->hl_conn = clst->hl_conn;
 525                         nlisten++;
 526                 } else if (proto_server(nlst->hl_addr, &nlst->hl_conn) == 0) {
 527                         pjdlog_info("Listening on new address %s.",
 528                             nlst->hl_addr);
 529                         nlisten++;
 530                 } else {
 531                         pjdlog_errno(LOG_WARNING,
 532                             "Unable to listen on address %s", nlst->hl_addr);
 533                 }
 534         }
 535         if (nlisten == 0) {
 536                 pjdlog_error("No addresses to listen on.");
 537                 goto failed;
 538         }
 539         /*
 540          * Check if pidfile's path has changed.
 541          */
 542         if (!foreground && pidfile == NULL &&
 543             strcmp(cfg->hc_pidfile, newcfg->hc_pidfile) != 0) {
 544                 newpfh = pidfile_open(newcfg->hc_pidfile, 0600, &otherpid);
 545                 if (newpfh == NULL) {
 546                         if (errno == EEXIST) {
 547                                 pjdlog_errno(LOG_WARNING,
 548                                     "Another hastd is already running, pidfile: %s, pid: %jd.",
 549                                     newcfg->hc_pidfile, (intmax_t)otherpid);
 550                         } else {
 551                                 pjdlog_errno(LOG_WARNING,
 552                                     "Unable to open or create pidfile %s",
 553                                     newcfg->hc_pidfile);
 554                         }
 555                 } else if (pidfile_write(newpfh) == -1) {
 556                         /* Write PID to a file. */
 557                         pjdlog_errno(LOG_WARNING,
 558                             "Unable to write PID to file %s",
 559                             newcfg->hc_pidfile);
 560                 } else {
 561                         pjdlog_debug(1, "PID stored in %s.",
 562                             newcfg->hc_pidfile);
 563                 }
 564         }
 565
 566         /* No failures from now on. */
 567
 568         /*
 569          * Switch to new control socket.
 570          */
 571         if (newcfg->hc_controlconn != NULL) {
 572                 pjdlog_info("Control socket changed from %s to %s.",
 573                     cfg->hc_controladdr, newcfg->hc_controladdr);
 574                 proto_close(cfg->hc_controlconn);
 575                 cfg->hc_controlconn = newcfg->hc_controlconn;
 576                 newcfg->hc_controlconn = NULL;
 577                 strlcpy(cfg->hc_controladdr, newcfg->hc_controladdr,
 578                     sizeof(cfg->hc_controladdr));
 579         }
 580         /*
 581          * Switch to new pidfile.
 582          */
 583         if (newpfh != NULL) {
 584                 pjdlog_info("Pidfile changed from %s to %s.", cfg->hc_pidfile,
 585                     newcfg->hc_pidfile);
 586                 (void)pidfile_remove(pfh);
 587                 pfh = newpfh;
 588                 (void)strlcpy(cfg->hc_pidfile, newcfg->hc_pidfile,
 589                     sizeof(cfg->hc_pidfile));
 590         }
 591         /*
 592          * Switch to new listen addresses. Close all that were removed.
 593          */
 594         while ((clst = TAILQ_FIRST(&cfg->hc_listen)) != NULL) {
 595                 TAILQ_FOREACH(nlst, &newcfg->hc_listen, hl_next) {
 596                         if (strcmp(nlst->hl_addr, clst->hl_addr) == 0)
 597                                 break;
 598                 }
 599                 if (nlst == NULL && clst->hl_conn != NULL) {
 600                         proto_close(clst->hl_conn);
 601                         pjdlog_info("No longer listening on address %s.",
 602                             clst->hl_addr);
 603                 }
 604                 TAILQ_REMOVE(&cfg->hc_listen, clst, hl_next);
 605                 free(clst);
 606         }
 607         TAILQ_CONCAT(&cfg->hc_listen, &newcfg->hc_listen, hl_next);
 608
 609         /*
 610          * Stop and remove resources that were removed from the configuration.
 611          */
 612         TAILQ_FOREACH_SAFE(cres, &cfg->hc_resources, hr_next, tres) {
 613                 TAILQ_FOREACH(nres, &newcfg->hc_resources, hr_next) {
 614                         if (strcmp(cres->hr_name, nres->hr_name) == 0)
 615                                 break;
 616                 }
 617                 if (nres == NULL) {
 618                         control_set_role(cres, HAST_ROLE_INIT);
 619                         TAILQ_REMOVE(&cfg->hc_resources, cres, hr_next);
 620                         pjdlog_info("Resource %s removed.", cres->hr_name);
 621                         free(cres);
 622                 }
 623         }
 624         /*
 625          * Move new resources to the current configuration.
 626          */
 627         TAILQ_FOREACH_SAFE(nres, &newcfg->hc_resources, hr_next, tres) {
 628                 TAILQ_FOREACH(cres, &cfg->hc_resources, hr_next) {
 629                         if (strcmp(cres->hr_name, nres->hr_name) == 0)
 630                                 break;
 631                 }
 632                 if (cres == NULL) {
 633                         TAILQ_REMOVE(&newcfg->hc_resources, nres, hr_next);
 634                         TAILQ_INSERT_TAIL(&cfg->hc_resources, nres, hr_next);
 635                         pjdlog_info("Resource %s added.", nres->hr_name);
 636                 }
 637         }
 638         /*
 639          * Deal with modified resources.
 640          * Depending on what has changed exactly we might want to perform
 641          * different actions.
 642          *
 643          * We do full resource restart in the following situations:
 644          * Resource role is INIT or SECONDARY.
 645          * Resource role is PRIMARY and path to local component or provider
 646          * name has changed.
 647          * In case of PRIMARY, the worker process will be killed and restarted,
 648          * which also means removing /dev/hast/<name> provider and
 649          * recreating it.
 650          *
 651          * We do just reload (send SIGHUP to worker process) if we act as
 652          * PRIMARY, but only if remote address, source address, replication
 653          * mode, timeout, execution path or metaflush has changed.
 654          * For those, there is no need to restart worker process.
 655          * If PRIMARY receives SIGHUP, it will reconnect if remote address or
 656          * source address has changed or it will set new timeout if only timeout
 657          * has changed or it will update metaflush if only metaflush has
 658          * changed.
 659          */
 660         TAILQ_FOREACH_SAFE(nres, &newcfg->hc_resources, hr_next, tres) {
 661                 TAILQ_FOREACH(cres, &cfg->hc_resources, hr_next) {
 662                         if (strcmp(cres->hr_name, nres->hr_name) == 0)
 663                                 break;
 664                 }
 665                 PJDLOG_ASSERT(cres != NULL);
 666                 if (resource_needs_restart(cres, nres)) {
 667                         pjdlog_info("Resource %s configuration was modified, restarting it.",
 668                             cres->hr_name);
 669                         role = cres->hr_role;
 670                         control_set_role(cres, HAST_ROLE_INIT);
 671                         TAILQ_REMOVE(&cfg->hc_resources, cres, hr_next);
 672                         free(cres);
 673                         TAILQ_REMOVE(&newcfg->hc_resources, nres, hr_next);
 674                         TAILQ_INSERT_TAIL(&cfg->hc_resources, nres, hr_next);
 675                         control_set_role(nres, role);
 676                 } else if (resource_needs_reload(cres, nres)) {
 677                         pjdlog_info("Resource %s configuration was modified, reloading it.",
 678                             cres->hr_name);
 679                         strlcpy(cres->hr_remoteaddr, nres->hr_remoteaddr,
 680                             sizeof(cres->hr_remoteaddr));
 681                         strlcpy(cres->hr_sourceaddr, nres->hr_sourceaddr,
 682                             sizeof(cres->hr_sourceaddr));
 683                         cres->hr_replication = nres->hr_replication;
 684                         cres->hr_checksum = nres->hr_checksum;
 685                         cres->hr_compression = nres->hr_compression;
 686                         cres->hr_timeout = nres->hr_timeout;
 687                         strlcpy(cres->hr_exec, nres->hr_exec,
 688                             sizeof(cres->hr_exec));
 689                         cres->hr_metaflush = nres->hr_metaflush;
 690                         if (cres->hr_workerpid != 0)
 691                                 resource_reload(cres);
 692                 }
 693         }
 694
 695         yy_config_free(newcfg);
 696         pjdlog_info("Configuration reloaded successfully.");
 697         return;
 698 failed:
 699         if (newcfg != NULL) {
 700                 if (newcfg->hc_controlconn != NULL)
 701                         proto_close(newcfg->hc_controlconn);
 702                 while ((nlst = TAILQ_FIRST(&newcfg->hc_listen)) != NULL) {
 703                         if (nlst->hl_conn != NULL) {
 704                                 TAILQ_FOREACH(clst, &cfg->hc_listen, hl_next) {
 705                                         if (strcmp(nlst->hl_addr,
 706                                             clst->hl_addr) == 0) {
 707                                                 break;
 708                                         }
 709                                 }
 710                                 if (clst == NULL || clst->hl_conn == NULL)
 711                                         proto_close(nlst->hl_conn);
 712                         }
 713                         TAILQ_REMOVE(&newcfg->hc_listen, nlst, hl_next);
 714                         free(nlst);
 715                 }
 716                 yy_config_free(newcfg);
 717         }
 718         if (newpfh != NULL)
 719                 (void)pidfile_remove(newpfh);
 720         pjdlog_warning("Configuration not reloaded.");
 721 }
 722
 723 static void
 724 terminate_workers(void)
 725 {
 726         struct hast_resource *res;
 727
 728         pjdlog_info("Termination signal received, exiting.");
 729         TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
 730                 if (res->hr_workerpid == 0)
 731                         continue;
 732                 pjdlog_info("Terminating worker process (resource=%s, role=%s, pid=%u).",
 733                     res->hr_name, role2str(res->hr_role), res->hr_workerpid);
 734                 if (kill(res->hr_workerpid, SIGTERM) == 0)
 735                         continue;
 736                 pjdlog_errno(LOG_WARNING,
 737                     "Unable to send signal to worker process (resource=%s, role=%s, pid=%u).",
 738                     res->hr_name, role2str(res->hr_role), res->hr_workerpid);
 739         }
 740 }
 741
 742 static void
 743 listen_accept(struct hastd_listen *lst)
 744 {
 745         struct hast_resource *res;
 746         struct proto_conn *conn;
 747         struct nv *nvin, *nvout, *nverr;
 748         const char *resname;
 749         const unsigned char *token;
 750         char laddr[256], raddr[256];
 751         uint8_t version;
 752         size_t size;
 753         pid_t pid;
 754         int status;
 755
 756         proto_local_address(lst->hl_conn, laddr, sizeof(laddr));
 757         pjdlog_debug(1, "Accepting connection to %s.", laddr);
 758
 759         if (proto_accept(lst->hl_conn, &conn) == -1) {
 760                 pjdlog_errno(LOG_ERR, "Unable to accept connection %s", laddr);
 761                 return;
 762         }
 763
 764         proto_local_address(conn, laddr, sizeof(laddr));
 765         proto_remote_address(conn, raddr, sizeof(raddr));
 766         pjdlog_info("Connection from %s to %s.", raddr, laddr);
 767
 768         /* Error in setting timeout is not critical, but why should it fail? */
 769         if (proto_timeout(conn, HAST_TIMEOUT) == -1)
 770                 pjdlog_errno(LOG_WARNING, "Unable to set connection timeout");
 771
 772         nvin = nvout = nverr = NULL;
 773
 774         /*
 775          * Before receiving any data see if remote host have access to any
 776          * resource.
 777          */
 778         TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
 779                 if (proto_address_match(conn, res->hr_remoteaddr))
 780                         break;
 781         }
 782         if (res == NULL) {
 783                 pjdlog_error("Client %s isn't known.", raddr);
 784                 goto close;
 785         }
 786         /* Ok, remote host can access at least one resource. */
 787
 788         if (hast_proto_recv_hdr(conn, &nvin) == -1) {
 789                 pjdlog_errno(LOG_ERR, "Unable to receive header from %s",
 790                     raddr);
 791                 goto close;
 792         }
 793
 794         resname = nv_get_string(nvin, "resource");
 795         if (resname == NULL) {
 796                 pjdlog_error("No 'resource' field in the header received from %s.",
 797                     raddr);
 798                 goto close;
 799         }
 800         pjdlog_debug(2, "%s: resource=%s", raddr, resname);
 801         version = nv_get_uint8(nvin, "version");
 802         pjdlog_debug(2, "%s: version=%hhu", raddr, version);
 803         if (version == 0) {
 804                 /*
 805                  * If no version is sent, it means this is protocol version 1.
 806                  */
 807                 version = 1;
 808         }
 809         if (version > HAST_PROTO_VERSION) {
 810                 pjdlog_info("Remote protocol version %hhu is not supported, falling back to version %hhu.",
 811                     version, (unsigned char)HAST_PROTO_VERSION);
 812                 version = HAST_PROTO_VERSION;
 813         }
 814         pjdlog_debug(1, "Negotiated protocol version %hhu.", version);
 815         token = nv_get_uint8_array(nvin, &size, "token");
 816         /*
 817          * NULL token means that this is first connection.
 818          */
 819         if (token != NULL && size != sizeof(res->hr_token)) {
 820                 pjdlog_error("Received token of invalid size from %s (expected %zu, got %zu).",
 821                     raddr, sizeof(res->hr_token), size);
 822                 goto close;
 823         }
 824
 825         /*
 826          * From now on we want to send errors to the remote node.
 827          */
 828         nverr = nv_alloc();
 829
 830         /* Find resource related to this connection. */
 831         TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
 832                 if (strcmp(resname, res->hr_name) == 0)
 833                         break;
 834         }
 835         /* Have we found the resource? */
 836         if (res == NULL) {
 837                 pjdlog_error("No resource '%s' as requested by %s.",
 838                     resname, raddr);
 839                 nv_add_stringf(nverr, "errmsg", "Resource not configured.");
 840                 goto fail;
 841         }
 842
 843         /* Now that we know resource name setup log prefix. */
 844         pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role));
 845
 846         /* Does the remote host have access to this resource? */
 847         if (!proto_address_match(conn, res->hr_remoteaddr)) {
 848                 pjdlog_error("Client %s has no access to the resource.", raddr);
 849                 nv_add_stringf(nverr, "errmsg", "No access to the resource.");
 850                 goto fail;
 851         }
 852         /* Is the resource marked as secondary? */
 853         if (res->hr_role != HAST_ROLE_SECONDARY) {
 854                 pjdlog_warning("We act as %s for the resource and not as %s as requested by %s.",
 855                     role2str(res->hr_role), role2str(HAST_ROLE_SECONDARY),
 856                     raddr);
 857                 nv_add_stringf(nverr, "errmsg",
 858                     "Remote node acts as %s for the resource and not as %s.",
 859                     role2str(res->hr_role), role2str(HAST_ROLE_SECONDARY));
 860                 if (res->hr_role == HAST_ROLE_PRIMARY) {
 861                         /*
 862                          * If we act as primary request the other side to wait
 863                          * for us a bit, as we might be finishing cleanups.
 864                          */
 865                         nv_add_uint8(nverr, 1, "wait");
 866                 }
 867                 goto fail;
 868         }
 869         /* Does token (if exists) match? */
 870         if (token != NULL && memcmp(token, res->hr_token,
 871             sizeof(res->hr_token)) != 0) {
 872                 pjdlog_error("Token received from %s doesn't match.", raddr);
 873                 nv_add_stringf(nverr, "errmsg", "Token doesn't match.");
 874                 goto fail;
 875         }
 876         /*
 877          * If there is no token, but we have half-open connection
 878          * (only remotein) or full connection (worker process is running)
 879          * we have to cancel those and accept the new connection.
 880          */
 881         if (token == NULL) {
 882                 PJDLOG_ASSERT(res->hr_remoteout == NULL);
 883                 pjdlog_debug(1, "Initial connection from %s.", raddr);
 884                 if (res->hr_workerpid != 0) {
 885                         PJDLOG_ASSERT(res->hr_remotein == NULL);
 886                         pjdlog_debug(1,
 887                             "Worker process exists (pid=%u), stopping it.",
 888                             (unsigned int)res->hr_workerpid);
 889                         /* Stop child process. */
 890                         if (kill(res->hr_workerpid, SIGINT) == -1) {
 891                                 pjdlog_errno(LOG_ERR,
 892                                     "Unable to stop worker process (pid=%u)",
 893                                     (unsigned int)res->hr_workerpid);
 894                                 /*
 895                                  * Other than logging the problem we
 896                                  * ignore it - nothing smart to do.
 897                                  */
 898                         }
 899                         /* Wait for it to exit. */
 900                         else if ((pid = waitpid(res->hr_workerpid,
 901                             &status, 0)) != res->hr_workerpid) {
 902                                 /* We can only log the problem. */
 903                                 pjdlog_errno(LOG_ERR,
 904                                     "Waiting for worker process (pid=%u) failed",
 905                                     (unsigned int)res->hr_workerpid);
 906                         } else {
 907                                 child_exit_log(res->hr_workerpid, status);
 908                         }
 909                         child_cleanup(res);
 910                 } else if (res->hr_remotein != NULL) {
 911                         char oaddr[256];
 912
 913                         proto_remote_address(res->hr_remotein, oaddr,
 914                             sizeof(oaddr));
 915                         pjdlog_debug(1,
 916                             "Canceling half-open connection from %s on connection from %s.",
 917                             oaddr, raddr);
 918                         proto_close(res->hr_remotein);
 919                         res->hr_remotein = NULL;
 920                 }
 921         }
 922
 923         /*
 924          * Checks and cleanups are done.
 925          */
 926
 927         if (token == NULL) {
 928                 res->hr_version = version;
 929                 arc4random_buf(res->hr_token, sizeof(res->hr_token));
 930                 nvout = nv_alloc();
 931                 nv_add_uint8(nvout, version, "version");
 932                 nv_add_uint8_array(nvout, res->hr_token,
 933                     sizeof(res->hr_token), "token");
 934                 if (nv_error(nvout) != 0) {
 935                         pjdlog_common(LOG_ERR, 0, nv_error(nvout),
 936                             "Unable to prepare return header for %s", raddr);
 937                         nv_add_stringf(nverr, "errmsg",
 938                             "Remote node was unable to prepare return header: %s.",
 939                             strerror(nv_error(nvout)));
 940                         goto fail;
 941                 }
 942                 if (hast_proto_send(res, conn, nvout, NULL, 0) == -1) {
 943                         int error = errno;
 944
 945                         pjdlog_errno(LOG_ERR, "Unable to send response to %s",
 946                             raddr);
 947                         nv_add_stringf(nverr, "errmsg",
 948                             "Remote node was unable to send response: %s.",
 949                             strerror(error));
 950                         goto fail;
 951                 }
 952                 res->hr_remotein = conn;
 953                 pjdlog_debug(1, "Incoming connection from %s configured.",
 954                     raddr);
 955         } else {
 956                 res->hr_remoteout = conn;
 957                 pjdlog_debug(1, "Outgoing connection to %s configured.", raddr);
 958                 hastd_secondary(res, nvin);
 959         }
 960         nv_free(nvin);
 961         nv_free(nvout);
 962         nv_free(nverr);
 963         pjdlog_prefix_set("%s", "");
 964         return;
 965 fail:
 966         if (nv_error(nverr) != 0) {
 967                 pjdlog_common(LOG_ERR, 0, nv_error(nverr),
 968                     "Unable to prepare error header for %s", raddr);
 969                 goto close;
 970         }
 971         if (hast_proto_send(NULL, conn, nverr, NULL, 0) == -1) {
 972                 pjdlog_errno(LOG_ERR, "Unable to send error to %s", raddr);
 973                 goto close;
 974         }
 975 close:
 976         if (nvin != NULL)
 977                 nv_free(nvin);
 978         if (nvout != NULL)
 979                 nv_free(nvout);
 980         if (nverr != NULL)
 981                 nv_free(nverr);
 982         proto_close(conn);
 983         pjdlog_prefix_set("%s", "");
 984 }
 985
 986 static void
 987 connection_migrate(struct hast_resource *res)
 988 {
 989         struct proto_conn *conn;
 990         int16_t val = 0;
 991
 992         pjdlog_prefix_set("[%s] (%s) ", res->hr_name, role2str(res->hr_role));
 993
 994         PJDLOG_ASSERT(res->hr_role == HAST_ROLE_PRIMARY);
 995
 996         if (proto_recv(res->hr_conn, &val, sizeof(val)) == -1) {
 997                 pjdlog_errno(LOG_WARNING,
 998                     "Unable to receive connection command");
 999                 return;
1000         }
1001         if (proto_client(res->hr_sourceaddr[0] != '\0' ? res->hr_sourceaddr : NULL,
1002             res->hr_remoteaddr, &conn) == -1) {
1003                 val = errno;
1004                 pjdlog_errno(LOG_WARNING,
1005                     "Unable to create outgoing connection to %s",
1006                     res->hr_remoteaddr);
1007                 goto out;
1008         }
1009         if (proto_connect(conn, -1) == -1) {
1010                 val = errno;
1011                 pjdlog_errno(LOG_WARNING, "Unable to connect to %s",
1012                     res->hr_remoteaddr);
1013                 proto_close(conn);
1014                 goto out;
1015         }
1016         val = 0;
1017 out:
1018         if (proto_send(res->hr_conn, &val, sizeof(val)) == -1) {
1019                 pjdlog_errno(LOG_WARNING,
1020                     "Unable to send reply to connection request");
1021         }
1022         if (val == 0 && proto_connection_send(res->hr_conn, conn) == -1)
1023                 pjdlog_errno(LOG_WARNING, "Unable to send connection");
1024
1025         pjdlog_prefix_set("%s", "");
1026 }
1027
1028 static void
1029 check_signals(void)
1030 {
1031         struct timespec sigtimeout;
1032         sigset_t mask;
1033         int signo;
1034
1035         sigtimeout.tv_sec = 0;
1036         sigtimeout.tv_nsec = 0;
1037
1038         PJDLOG_VERIFY(sigemptyset(&mask) == 0);
1039         PJDLOG_VERIFY(sigaddset(&mask, SIGHUP) == 0);
1040         PJDLOG_VERIFY(sigaddset(&mask, SIGINT) == 0);
1041         PJDLOG_VERIFY(sigaddset(&mask, SIGTERM) == 0);
1042         PJDLOG_VERIFY(sigaddset(&mask, SIGCHLD) == 0);
1043
1044         while ((signo = sigtimedwait(&mask, NULL, &sigtimeout)) != -1) {
1045                 switch (signo) {
1046                 case SIGINT:
1047                 case SIGTERM:
1048                         sigexit_received = true;
1049                         terminate_workers();
1050                         proto_close(cfg->hc_controlconn);
1051                         exit(EX_OK);
1052                         break;
1053                 case SIGCHLD:
1054                         child_exit();
1055                         break;
1056                 case SIGHUP:
1057                         hastd_reload();
1058                         break;
1059                 default:
1060                         PJDLOG_ABORT("Unexpected signal (%d).", signo);
1061                 }
1062         }
1063 }
1064
1065 static void
1066 main_loop(void)
1067 {
1068         struct hast_resource *res;
1069         struct hastd_listen *lst;
1070         struct timeval seltimeout;
1071         int fd, maxfd, ret;
1072         time_t lastcheck, now;
1073         fd_set rfds;
1074
1075         lastcheck = time(NULL);
1076         seltimeout.tv_sec = REPORT_INTERVAL;
1077         seltimeout.tv_usec = 0;
1078
1079         for (;;) {
1080                 check_signals();
1081
1082                 /* Setup descriptors for select(2). */
1083                 FD_ZERO(&rfds);
1084                 maxfd = fd = proto_descriptor(cfg->hc_controlconn);
1085                 PJDLOG_ASSERT(fd >= 0);
1086                 FD_SET(fd, &rfds);
1087                 TAILQ_FOREACH(lst, &cfg->hc_listen, hl_next) {
1088                         if (lst->hl_conn == NULL)
1089                                 continue;
1090                         fd = proto_descriptor(lst->hl_conn);
1091                         PJDLOG_ASSERT(fd >= 0);
1092                         FD_SET(fd, &rfds);
1093                         maxfd = fd > maxfd ? fd : maxfd;
1094                 }
1095                 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
1096                         if (res->hr_event == NULL)
1097                                 continue;
1098                         fd = proto_descriptor(res->hr_event);
1099                         PJDLOG_ASSERT(fd >= 0);
1100                         FD_SET(fd, &rfds);
1101                         maxfd = fd > maxfd ? fd : maxfd;
1102                         if (res->hr_role == HAST_ROLE_PRIMARY) {
1103                                 /* Only primary workers asks for connections. */
1104                                 PJDLOG_ASSERT(res->hr_conn != NULL);
1105                                 fd = proto_descriptor(res->hr_conn);
1106                                 PJDLOG_ASSERT(fd >= 0);
1107                                 FD_SET(fd, &rfds);
1108                                 maxfd = fd > maxfd ? fd : maxfd;
1109                         } else {
1110                                 PJDLOG_ASSERT(res->hr_conn == NULL);
1111                         }
1112                 }
1113
1114                 PJDLOG_ASSERT(maxfd + 1 <= (int)FD_SETSIZE);
1115                 ret = select(maxfd + 1, &rfds, NULL, NULL, &seltimeout);
1116                 now = time(NULL);
1117                 if (lastcheck + REPORT_INTERVAL <= now) {
1118                         hook_check();
1119                         lastcheck = now;
1120                 }
1121                 if (ret == 0) {
1122                         /*
1123                          * select(2) timed out, so there should be no
1124                          * descriptors to check.
1125                          */
1126                         continue;
1127                 } else if (ret == -1) {
1128                         if (errno == EINTR)
1129                                 continue;
1130                         KEEP_ERRNO((void)pidfile_remove(pfh));
1131                         pjdlog_exit(EX_OSERR, "select() failed");
1132                 }
1133
1134                 /*
1135                  * Check for signals before we do anything to update our
1136                  * info about terminated workers in the meantime.
1137                  */
1138                 check_signals();
1139
1140                 if (FD_ISSET(proto_descriptor(cfg->hc_controlconn), &rfds))
1141                         control_handle(cfg);
1142                 TAILQ_FOREACH(lst, &cfg->hc_listen, hl_next) {
1143                         if (lst->hl_conn == NULL)
1144                                 continue;
1145                         if (FD_ISSET(proto_descriptor(lst->hl_conn), &rfds))
1146                                 listen_accept(lst);
1147                 }
1148                 TAILQ_FOREACH(res, &cfg->hc_resources, hr_next) {
1149                         if (res->hr_event == NULL)
1150                                 continue;
1151                         if (FD_ISSET(proto_descriptor(res->hr_event), &rfds)) {
1152                                 if (event_recv(res) == 0)
1153                                         continue;
1154                                 /* The worker process exited? */
1155                                 proto_close(res->hr_event);
1156                                 res->hr_event = NULL;
1157                                 if (res->hr_conn != NULL) {
1158                                         proto_close(res->hr_conn);
1159                                         res->hr_conn = NULL;
1160                                 }
1161                                 continue;
1162                         }
1163                         if (res->hr_role == HAST_ROLE_PRIMARY) {
1164                                 PJDLOG_ASSERT(res->hr_conn != NULL);
1165                                 if (FD_ISSET(proto_descriptor(res->hr_conn),
1166                                     &rfds)) {
1167                                         connection_migrate(res);
1168                                 }
1169                         } else {
1170                                 PJDLOG_ASSERT(res->hr_conn == NULL);
1171                         }
1172                 }
1173         }
1174 }
1175
1176 static void
1177 dummy_sighandler(int sig __unused)
1178 {
1179         /* Nothing to do. */
1180 }
1181
1182 int
1183 main(int argc, char *argv[])
1184 {
1185         struct hastd_listen *lst;
1186         pid_t otherpid;
1187         int debuglevel;
1188         sigset_t mask;
1189
1190         foreground = false;
1191         debuglevel = 0;
1192
1193         for (;;) {
1194                 int ch;
1195
1196                 ch = getopt(argc, argv, "c:dFhP:");
1197                 if (ch == -1)
1198                         break;
1199                 switch (ch) {
1200                 case 'c':
1201                         cfgpath = optarg;
1202                         break;
1203                 case 'd':
1204                         debuglevel++;
1205                         break;
1206                 case 'F':
1207                         foreground = true;
1208                         break;
1209                 case 'P':
1210                         pidfile = optarg;
1211                         break;
1212                 case 'h':
1213                 default:
1214                         usage();
1215                 }
1216         }
1217         argc -= optind;
1218         argv += optind;
1219
1220         pjdlog_init(PJDLOG_MODE_STD);
1221         pjdlog_debug_set(debuglevel);
1222
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 }