src/server.c

   1 #include "first.h"
   2
   3 #include "server.h"
   4 #include "buffer.h"
   5 #include "network.h"
   6 #include "log.h"
   7 #include "keyvalue.h"
   8 #include "rand.h"
   9 #include "response.h"
  10 #include "request.h"
  11 #include "chunk.h"
  12 #include "http_auth.h"
  13 #include "http_chunk.h"
  14 #include "http_vhostdb.h"
  15 #include "fdevent.h"
  16 #include "connections.h"
  17 #include "sock_addr.h"
  18 #include "stat_cache.h"
  19 #include "plugin.h"
  20 #include "joblist.h"
  21 #include "network_write.h"
  22
  23 #ifdef HAVE_VERSIONSTAMP_H
  24 # include "versionstamp.h"
  25 #else
  26 # define REPO_VERSION ""
  27 #endif
  28
  29 #define PACKAGE_DESC PACKAGE_NAME "/" PACKAGE_VERSION REPO_VERSION
  30
  31 #include <sys/types.h>
  32 #include <sys/time.h>
  33 #include <sys/stat.h>
  34 #include <sys/wait.h>
  35
  36 #include <string.h>
  37 #include <errno.h>
  38 #include <fcntl.h>
  39 #include <unistd.h>
  40 #include <stdlib.h>
  41 #include <time.h>
  42 #include <signal.h>
  43 #include <locale.h>
  44
  45 #include <stdio.h>
  46
  47 #ifdef HAVE_GETOPT_H
  48 # include <getopt.h>
  49 #endif
  50
  51 #ifdef HAVE_VALGRIND_VALGRIND_H
  52 # include <valgrind/valgrind.h>
  53 #endif
  54
  55 #ifdef HAVE_SYS_WAIT_H
  56 # include <sys/wait.h>
  57 #endif
  58
  59 #ifdef HAVE_PWD_H
  60 # include <grp.h>
  61 # include <pwd.h>
  62 #endif
  63
  64 #ifdef HAVE_SYSLOG_H
  65 # include <syslog.h>
  66 #endif
  67
  68 #ifdef HAVE_SYS_RESOURCE_H
  69 # include <sys/resource.h>
  70 #endif
  71
  72 #ifdef HAVE_SYS_PRCTL_H
  73 # include <sys/prctl.h>
  74 #endif
  75
  76 #if defined HAVE_LIBSSL && defined HAVE_OPENSSL_SSL_H
  77 #define USE_SSL
  78 #define TEXT_SSL " (ssl)"
  79 #else
  80 #define TEXT_SSL
  81 #endif
  82
  83 #ifndef __sgi
  84 /* IRIX doesn't like the alarm based time() optimization */
  85 /* #define USE_ALARM */
  86 #endif
  87
  88 static int oneshot_fd = 0;
  89 static volatile int pid_fd = -2;
  90 static server_socket_array graceful_sockets;
  91 static volatile sig_atomic_t graceful_restart = 0;
  92 static volatile sig_atomic_t graceful_shutdown = 0;
  93 static volatile sig_atomic_t srv_shutdown = 0;
  94 static volatile sig_atomic_t handle_sig_child = 0;
  95 static volatile sig_atomic_t handle_sig_alarm = 1;
  96 static volatile sig_atomic_t handle_sig_hup = 0;
  97
  98 #if defined(HAVE_SIGACTION) && defined(SA_SIGINFO)
  99 static volatile siginfo_t last_sigterm_info;
 100 static volatile siginfo_t last_sighup_info;
 101
 102 static void sigaction_handler(int sig, siginfo_t *si, void *context) {
 103         static const siginfo_t empty_siginfo;
 104         UNUSED(context);
 105
 106         if (!si) *(const siginfo_t **)&si = &empty_siginfo;
 107
 108         switch (sig) {
 109         case SIGTERM:
 110                 srv_shutdown = 1;
 111                 last_sigterm_info = *si;
 112                 break;
 113         case SIGUSR1:
 114                 if (!graceful_shutdown) {
 115                         graceful_restart = 1;
 116                         graceful_shutdown = 1;
 117                         last_sigterm_info = *si;
 118                 }
 119                 break;
 120         case SIGINT:
 121                 if (graceful_shutdown) {
 122                         if (2 == graceful_restart)
 123                                 graceful_restart = 1;
 124                         else
 125                                 srv_shutdown = 1;
 126                 } else {
 127                         graceful_shutdown = 1;
 128                 }
 129                 last_sigterm_info = *si;
 130
 131                 break;
 132         case SIGALRM:
 133                 handle_sig_alarm = 1;
 134                 break;
 135         case SIGHUP:
 136                 handle_sig_hup = 1;
 137                 last_sighup_info = *si;
 138                 break;
 139         case SIGCHLD:
 140                 handle_sig_child = 1;
 141                 break;
 142         }
 143 }
 144 #elif defined(HAVE_SIGNAL) || defined(HAVE_SIGACTION)
 145 static void signal_handler(int sig) {
 146         switch (sig) {
 147         case SIGTERM: srv_shutdown = 1; break;
 148         case SIGUSR1:
 149                 if (!graceful_shutdown) {
 150                         graceful_restart = 1;
 151                         graceful_shutdown = 1;
 152                 }
 153                 break;
 154         case SIGINT:
 155                 if (graceful_shutdown) {
 156                         if (2 == graceful_restart)
 157                                 graceful_restart = 1;
 158                         else
 159                                 srv_shutdown = 1;
 160                 } else {
 161                         graceful_shutdown = 1;
 162                 }
 163                 break;
 164         case SIGALRM: handle_sig_alarm = 1; break;
 165         case SIGHUP:  handle_sig_hup = 1; break;
 166         case SIGCHLD: handle_sig_child = 1; break;
 167         }
 168 }
 169 #endif
 170
 171 #ifdef HAVE_FORK
 172 static int daemonize(void) {
 173         int pipefd[2];
 174         pid_t pid;
 175 #ifdef SIGTTOU
 176         signal(SIGTTOU, SIG_IGN);
 177 #endif
 178 #ifdef SIGTTIN
 179         signal(SIGTTIN, SIG_IGN);
 180 #endif
 181 #ifdef SIGTSTP
 182         signal(SIGTSTP, SIG_IGN);
 183 #endif
 184
 185         if (pipe(pipefd) < 0) exit(-1);
 186
 187         if (0 > (pid = fork())) exit(-1);
 188
 189         if (0 < pid) {
 190                 char buf;
 191                 ssize_t bytes;
 192
 193                 close(pipefd[1]);
 194                 /* parent waits for grandchild to be ready */
 195                 do {
 196                         bytes = read(pipefd[0], &buf, sizeof(buf));
 197                 } while (bytes < 0 && EINTR == errno);
 198                 close(pipefd[0]);
 199
 200                 if (bytes <= 0) {
 201                         /* closed fd (without writing) == failure in grandchild */
 202                         fputs("daemonized server failed to start; check error log for details\n", stderr);
 203                         exit(-1);
 204                 }
 205
 206                 exit(0);
 207         }
 208
 209         close(pipefd[0]);
 210
 211         if (-1 == setsid()) exit(0);
 212
 213         signal(SIGHUP, SIG_IGN);
 214
 215         if (0 != fork()) exit(0);
 216
 217         if (0 != chdir("/")) exit(0);
 218
 219         fdevent_setfd_cloexec(pipefd[1]);
 220         return pipefd[1];
 221 }
 222 #endif
 223
 224 static server *server_init(void) {
 225         int i;
 226         server *srv = calloc(1, sizeof(*srv));
 227         force_assert(srv);
 228 #define CLEAN(x) \
 229         srv->x = buffer_init();
 230
 231         CLEAN(response_header);
 232         CLEAN(parse_full_path);
 233         CLEAN(ts_debug_str);
 234         CLEAN(ts_date_str);
 235         CLEAN(errorlog_buf);
 236         CLEAN(response_range);
 237         CLEAN(tmp_buf);
 238         srv->empty_string = buffer_init_string("");
 239         CLEAN(cond_check_buf);
 240
 241         CLEAN(srvconf.errorlog_file);
 242         CLEAN(srvconf.breakagelog_file);
 243         CLEAN(srvconf.groupname);
 244         CLEAN(srvconf.username);
 245         CLEAN(srvconf.changeroot);
 246         CLEAN(srvconf.bindhost);
 247         CLEAN(srvconf.event_handler);
 248         CLEAN(srvconf.pid_file);
 249         CLEAN(srvconf.syslog_facility);
 250
 251         CLEAN(tmp_chunk_len);
 252 #undef CLEAN
 253
 254 #define CLEAN(x) \
 255         srv->x = array_init();
 256
 257         CLEAN(config_context);
 258         CLEAN(config_touched);
 259         CLEAN(status);
 260 #undef CLEAN
 261
 262         for (i = 0; i < FILE_CACHE_MAX; i++) {
 263                 srv->mtime_cache[i].mtime = (time_t)-1;
 264                 srv->mtime_cache[i].str = buffer_init();
 265         }
 266
 267         li_rand_reseed();
 268
 269         srv->cur_ts = time(NULL);
 270         srv->startup_ts = srv->cur_ts;
 271
 272         srv->conns = calloc(1, sizeof(*srv->conns));
 273         force_assert(srv->conns);
 274
 275         srv->joblist = calloc(1, sizeof(*srv->joblist));
 276         force_assert(srv->joblist);
 277
 278         srv->fdwaitqueue = calloc(1, sizeof(*srv->fdwaitqueue));
 279         force_assert(srv->fdwaitqueue);
 280
 281         srv->srvconf.modules = array_init();
 282         srv->srvconf.modules_dir = buffer_init_string(LIBRARY_DIR);
 283         srv->srvconf.network_backend = buffer_init();
 284         srv->srvconf.upload_tempdirs = array_init();
 285         srv->srvconf.reject_expect_100_with_417 = 1;
 286         srv->srvconf.xattr_name = buffer_init_string("Content-Type");
 287         srv->srvconf.http_header_strict  = 1;
 288         srv->srvconf.http_host_strict    = 1; /*(implies http_host_normalize)*/
 289         srv->srvconf.http_host_normalize = 0;
 290         srv->srvconf.high_precision_timestamps = 0;
 291         srv->srvconf.max_request_field_size = 8192;
 292         srv->srvconf.loadavg[0] = 0.0;
 293         srv->srvconf.loadavg[1] = 0.0;
 294         srv->srvconf.loadavg[2] = 0.0;
 295
 296         /* use syslog */
 297         srv->errorlog_fd = STDERR_FILENO;
 298         srv->errorlog_mode = ERRORLOG_FD;
 299
 300         srv->split_vals = array_init();
 301         srv->request_env = plugins_call_handle_request_env;
 302
 303         return srv;
 304 }
 305
 306 static void server_free(server *srv) {
 307         size_t i;
 308
 309         for (i = 0; i < FILE_CACHE_MAX; i++) {
 310                 buffer_free(srv->mtime_cache[i].str);
 311         }
 312
 313         if (oneshot_fd > 0) {
 314                 close(oneshot_fd);
 315         }
 316
 317 #define CLEAN(x) \
 318         buffer_free(srv->x);
 319
 320         CLEAN(response_header);
 321         CLEAN(parse_full_path);
 322         CLEAN(ts_debug_str);
 323         CLEAN(ts_date_str);
 324         CLEAN(errorlog_buf);
 325         CLEAN(response_range);
 326         CLEAN(tmp_buf);
 327         CLEAN(empty_string);
 328         CLEAN(cond_check_buf);
 329
 330         CLEAN(srvconf.errorlog_file);
 331         CLEAN(srvconf.breakagelog_file);
 332         CLEAN(srvconf.groupname);
 333         CLEAN(srvconf.username);
 334         CLEAN(srvconf.changeroot);
 335         CLEAN(srvconf.bindhost);
 336         CLEAN(srvconf.event_handler);
 337         CLEAN(srvconf.pid_file);
 338         CLEAN(srvconf.modules_dir);
 339         CLEAN(srvconf.network_backend);
 340         CLEAN(srvconf.xattr_name);
 341         CLEAN(srvconf.syslog_facility);
 342
 343         CLEAN(tmp_chunk_len);
 344 #undef CLEAN
 345
 346 #if 0
 347         fdevent_unregister(srv->ev, srv->fd);
 348 #endif
 349         fdevent_free(srv->ev);
 350
 351         free(srv->conns);
 352
 353         if (srv->config_storage) {
 354                 for (i = 0; i < srv->config_context->used; i++) {
 355                         specific_config *s = srv->config_storage[i];
 356
 357                         if (!s) continue;
 358
 359                         buffer_free(s->document_root);
 360                         buffer_free(s->server_name);
 361                         buffer_free(s->server_tag);
 362                         buffer_free(s->error_handler);
 363                         buffer_free(s->error_handler_404);
 364                         buffer_free(s->errorfile_prefix);
 365                         buffer_free(s->socket_perms);
 366                         array_free(s->mimetypes);
 367                         free(s);
 368                 }
 369                 free(srv->config_storage);
 370                 srv->config_storage = NULL;
 371         }
 372
 373 #define CLEAN(x) \
 374         array_free(srv->x);
 375
 376         CLEAN(config_context);
 377         CLEAN(config_touched);
 378         CLEAN(status);
 379         CLEAN(srvconf.upload_tempdirs);
 380 #undef CLEAN
 381
 382         joblist_free(srv, srv->joblist);
 383         fdwaitqueue_free(srv, srv->fdwaitqueue);
 384
 385         if (srv->stat_cache) {
 386                 stat_cache_free(srv->stat_cache);
 387         }
 388
 389         array_free(srv->srvconf.modules);
 390         array_free(srv->split_vals);
 391
 392         li_rand_cleanup();
 393
 394         free(srv);
 395 }
 396
 397 static void remove_pid_file(server *srv) {
 398         if (pid_fd <= -2) return;
 399         if (!buffer_string_is_empty(srv->srvconf.pid_file) && 0 <= pid_fd) {
 400                 if (0 != ftruncate(pid_fd, 0)) {
 401                         log_error_write(srv, __FILE__, __LINE__, "sbds",
 402                                         "ftruncate failed for:",
 403                                         srv->srvconf.pid_file,
 404                                         errno,
 405                                         strerror(errno));
 406                 }
 407         }
 408         if (0 <= pid_fd) {
 409                 close(pid_fd);
 410                 pid_fd = -1;
 411         }
 412         if (!buffer_string_is_empty(srv->srvconf.pid_file) &&
 413             buffer_string_is_empty(srv->srvconf.changeroot)) {
 414                 if (0 != unlink(srv->srvconf.pid_file->ptr)) {
 415                         if (errno != EACCES && errno != EPERM) {
 416                                 log_error_write(srv, __FILE__, __LINE__, "sbds",
 417                                                 "unlink failed for:",
 418                                                 srv->srvconf.pid_file,
 419                                                 errno,
 420                                                 strerror(errno));
 421                         }
 422                 }
 423         }
 424 }
 425
 426
 427 static server_socket * server_oneshot_getsock(server *srv, sock_addr *cnt_addr) {
 428         server_socket *srv_socket, *srv_socket_wild = NULL;
 429         size_t i;
 430         for (i = 0; i < srv->srv_sockets.used; ++i) {
 431                 srv_socket = srv->srv_sockets.ptr[i];
 432                 if (!sock_addr_is_port_eq(&srv_socket->addr,cnt_addr)) continue;
 433                 if (sock_addr_is_addr_eq(&srv_socket->addr,cnt_addr)) return srv_socket;
 434
 435                 if (NULL != srv_socket_wild) continue;
 436                 if (sock_addr_is_addr_wildcard(&srv_socket->addr)) {
 437                         srv_socket_wild = srv_socket;
 438                 }
 439         }
 440
 441         if (NULL != srv_socket_wild) {
 442                 return srv_socket_wild;
 443         } else if (srv->srv_sockets.used) {
 444                 return srv->srv_sockets.ptr[0];
 445         } else {
 446                 log_error_write(srv, __FILE__, __LINE__, "s", "no sockets configured");
 447                 return NULL;
 448         }
 449 }
 450
 451
 452 static int server_oneshot_init(server *srv, int fd) {
 453         /* Note: does not work with netcat due to requirement that fd be socket.
 454          * STDOUT_FILENO was not saved earlier in startup, and that is to where
 455          * netcat expects output to be sent.  Since lighttpd expects connections
 456          * to be sockets, con->fd is where output is sent; separate fds are not
 457          * stored for input and output, but netcat has different fds for stdin
 458          * and * stdout.  To support netcat, would additionally need to avoid
 459          * S_ISSOCK(), getsockname(), and getpeername() below, reconstructing
 460          * addresses from environment variables:
 461          *   NCAT_LOCAL_ADDR   NCAT_LOCAL_PORT
 462          *   NCAT_REMOTE_ADDR  NCAT_REMOTE_PORT
 463          *   NCAT_PROTO
 464          */
 465         connection *con;
 466         server_socket *srv_socket;
 467         sock_addr cnt_addr;
 468         socklen_t cnt_len;
 469         struct stat st;
 470
 471         if (0 != fstat(fd, &st)) {
 472                 log_error_write(srv, __FILE__, __LINE__, "ss", "fstat:", strerror(errno));
 473                 return 0;
 474         }
 475
 476         if (!S_ISSOCK(st.st_mode)) {
 477                 /* require that fd is a socket
 478                  * (modules might expect STDIN_FILENO and STDOUT_FILENO opened to /dev/null) */
 479                 log_error_write(srv, __FILE__, __LINE__, "s", "lighttpd -1 stdin is not a socket");
 480                 return 0;
 481         }
 482
 483         cnt_len = sizeof(cnt_addr);
 484         if (0 != getsockname(fd, (struct sockaddr *)&cnt_addr, &cnt_len)) {
 485                 log_error_write(srv, __FILE__, __LINE__, "ss", "getsockname:", strerror(errno));
 486                 return 0;
 487         }
 488
 489         srv_socket = server_oneshot_getsock(srv, &cnt_addr);
 490         if (NULL == srv_socket) return 0;
 491
 492         cnt_len = sizeof(cnt_addr);
 493         if (0 != getpeername(fd, (struct sockaddr *)&cnt_addr, &cnt_len)) {
 494                 log_error_write(srv, __FILE__, __LINE__, "ss", "getpeername:", strerror(errno));
 495                 return 0;
 496         }
 497
 498         /*(must set flags; fd did not pass through fdevent accept() logic)*/
 499         if (-1 == fdevent_fcntl_set_nb_cloexec(srv->ev, fd)) {
 500                 log_error_write(srv, __FILE__, __LINE__, "ss", "fcntl:", strerror(errno));
 501                 return 0;
 502         }
 503
 504         if (sock_addr_get_family(&cnt_addr) != AF_UNIX) {
 505                 network_accept_tcp_nagle_disable(fd);
 506         }
 507
 508         con = connection_accepted(srv, srv_socket, &cnt_addr, fd);
 509         if (NULL == con) return 0;
 510
 511         connection_state_machine(srv, con);
 512         return 1;
 513 }
 514
 515
 516 static void show_version (void) {
 517         char *b = PACKAGE_DESC TEXT_SSL \
 518 " - a light and fast webserver\n"
 519 #ifdef NONREPRODUCIBLE_BUILD
 520 "Build-Date: " __DATE__ " " __TIME__ "\n";
 521 #endif
 522 ;
 523         write_all(STDOUT_FILENO, b, strlen(b));
 524 }
 525
 526 static void show_features (void) {
 527   static const char features[] =
 528       "\nFeatures:\n\n"
 529 #ifdef HAVE_IPV6
 530       "\t+ IPv6 support\n"
 531 #else
 532       "\t- IPv6 support\n"
 533 #endif
 534 #if defined HAVE_ZLIB_H && defined HAVE_LIBZ
 535       "\t+ zlib support\n"
 536 #else
 537       "\t- zlib support\n"
 538 #endif
 539 #if defined HAVE_BZLIB_H && defined HAVE_LIBBZ2
 540       "\t+ bzip2 support\n"
 541 #else
 542       "\t- bzip2 support\n"
 543 #endif
 544 #if defined(HAVE_CRYPT) || defined(HAVE_CRYPT_R) || defined(HAVE_LIBCRYPT)
 545       "\t+ crypt support\n"
 546 #else
 547       "\t- crypt support\n"
 548 #endif
 549 #ifdef USE_SSL
 550       "\t+ SSL support\n"
 551 #else
 552       "\t- SSL support\n"
 553 #endif
 554 #ifdef HAVE_LIBPCRE
 555       "\t+ PCRE support\n"
 556 #else
 557       "\t- PCRE support\n"
 558 #endif
 559 #ifdef HAVE_MYSQL
 560       "\t+ MySQL support\n"
 561 #else
 562       "\t- MySQL support\n"
 563 #endif
 564 #ifdef HAVE_PGSQL
 565       "\t+ PgSQL support\n"
 566 #else
 567       "\t- PgSQL support\n"
 568 #endif
 569 #ifdef HAVE_DBI
 570       "\t+ DBI support\n"
 571 #else
 572       "\t- DBI support\n"
 573 #endif
 574 #ifdef HAVE_KRB5
 575       "\t+ Kerberos support\n"
 576 #else
 577       "\t- Kerberos support\n"
 578 #endif
 579 #if defined(HAVE_LDAP_H) && defined(HAVE_LBER_H) && defined(HAVE_LIBLDAP) && defined(HAVE_LIBLBER)
 580       "\t+ LDAP support\n"
 581 #else
 582       "\t- LDAP support\n"
 583 #endif
 584 #ifdef USE_MEMCACHED
 585       "\t+ memcached support\n"
 586 #else
 587       "\t- memcached support\n"
 588 #endif
 589 #ifdef HAVE_FAM_H
 590       "\t+ FAM support\n"
 591 #else
 592       "\t- FAM support\n"
 593 #endif
 594 #ifdef HAVE_LUA_H
 595       "\t+ LUA support\n"
 596 #else
 597       "\t- LUA support\n"
 598 #endif
 599 #ifdef HAVE_LIBXML_H
 600       "\t+ xml support\n"
 601 #else
 602       "\t- xml support\n"
 603 #endif
 604 #ifdef HAVE_SQLITE3_H
 605       "\t+ SQLite support\n"
 606 #else
 607       "\t- SQLite support\n"
 608 #endif
 609 #ifdef HAVE_GDBM_H
 610       "\t+ GDBM support\n"
 611 #else
 612       "\t- GDBM support\n"
 613 #endif
 614       ;
 615   show_version();
 616   printf("%s%s%s\n", fdevent_show_event_handlers(), network_write_show_handlers(), features);
 617 }
 618
 619 static void show_help (void) {
 620         char *b = PACKAGE_DESC TEXT_SSL
 621 #ifdef NONREPRODUCIBLE_BUILD
 622 " ("__DATE__ " " __TIME__ ")"
 623 #endif
 624 " - a light and fast webserver\n" \
 625 "usage:\n" \
 626 " -f <name>  filename of the config-file\n" \
 627 " -m <name>  module directory (default: "LIBRARY_DIR")\n" \
 628 " -i <secs>  graceful shutdown after <secs> of inactivity\n" \
 629 " -1         process single (one) request on stdin socket, then exit\n" \
 630 " -p         print the parsed config-file in internal form, and exit\n" \
 631 " -t         test config-file syntax, then exit\n" \
 632 " -tt        test config-file syntax, load and init modules, then exit\n" \
 633 " -D         don't go to background (default: go to background)\n" \
 634 " -v         show version\n" \
 635 " -V         show compile-time features\n" \
 636 " -h         show this help\n" \
 637 "\n"
 638 ;
 639         write_all(STDOUT_FILENO, b, strlen(b));
 640 }
 641
 642 /**
 643  * open the errorlog
 644  *
 645  * we have 4 possibilities:
 646  * - stderr (default)
 647  * - syslog
 648  * - logfile
 649  * - pipe
 650  *
 651  */
 652
 653 static int log_error_open(server *srv) {
 654     int errfd;
 655   #ifdef HAVE_SYSLOG_H
 656     /* perhaps someone wants to use syslog() */
 657     int facility = -1;
 658     if (!buffer_string_is_empty(srv->srvconf.syslog_facility)) {
 659         static const struct facility_name_st {
 660           const char *name;
 661           int val;
 662         } facility_names[] = {
 663             { "auth",     LOG_AUTH }
 664           #ifdef LOG_AUTHPRIV
 665            ,{ "authpriv", LOG_AUTHPRIV }
 666           #endif
 667           #ifdef LOG_CRON
 668            ,{ "cron",     LOG_CRON }
 669           #endif
 670            ,{ "daemon",   LOG_DAEMON }
 671           #ifdef LOG_FTP
 672            ,{ "ftp",      LOG_FTP }
 673           #endif
 674           #ifdef LOG_KERN
 675            ,{ "kern",     LOG_KERN }
 676           #endif
 677           #ifdef LOG_LPR
 678            ,{ "lpr",      LOG_LPR }
 679           #endif
 680           #ifdef LOG_MAIL
 681            ,{ "mail",     LOG_MAIL }
 682           #endif
 683           #ifdef LOG_NEWS
 684            ,{ "news",     LOG_NEWS }
 685           #endif
 686            ,{ "security", LOG_AUTH }           /* DEPRECATED */
 687           #ifdef LOG_SYSLOG
 688            ,{ "syslog",   LOG_SYSLOG }
 689           #endif
 690           #ifdef LOG_USER
 691            ,{ "user",     LOG_USER }
 692           #endif
 693           #ifdef LOG_UUCP
 694            ,{ "uucp",     LOG_UUCP }
 695           #endif
 696            ,{ "local0",   LOG_LOCAL0 }
 697            ,{ "local1",   LOG_LOCAL1 }
 698            ,{ "local2",   LOG_LOCAL2 }
 699            ,{ "local3",   LOG_LOCAL3 }
 700            ,{ "local4",   LOG_LOCAL4 }
 701            ,{ "local5",   LOG_LOCAL5 }
 702            ,{ "local6",   LOG_LOCAL6 }
 703            ,{ "local7",   LOG_LOCAL7 }
 704         };
 705         unsigned int i;
 706         for (i = 0; i < sizeof(facility_names)/sizeof(facility_names[0]); ++i) {
 707             const struct facility_name_st *f = facility_names+i;
 708             if (0 == strcmp(srv->srvconf.syslog_facility->ptr, f->name)) {
 709                 facility = f->val;
 710                 break;
 711             }
 712         }
 713         if (-1 == facility) {
 714             log_error_write(srv, __FILE__, __LINE__, "SBS",
 715                             "unrecognized server.syslog-facility: \"",
 716                             srv->srvconf.syslog_facility,
 717                             "\"; defaulting to \"daemon\" facility");
 718         }
 719     }
 720     openlog("lighttpd", LOG_CONS|LOG_PID, -1==facility ? LOG_DAEMON : facility);
 721   #endif
 722
 723     srv->errorlog_mode = ERRORLOG_FD;
 724     srv->errorlog_fd = STDERR_FILENO;
 725
 726     if (srv->srvconf.errorlog_use_syslog) {
 727         srv->errorlog_mode = ERRORLOG_SYSLOG;
 728     }
 729     else if (!buffer_string_is_empty(srv->srvconf.errorlog_file)) {
 730         const char *logfile = srv->srvconf.errorlog_file->ptr;
 731
 732         if (-1 == (srv->errorlog_fd = fdevent_open_logger(logfile))) {
 733             log_error_write(srv, __FILE__, __LINE__, "SSSS",
 734                             "opening errorlog '", logfile,
 735                             "' failed: ", strerror(errno));
 736             return -1;
 737         }
 738         srv->errorlog_mode = logfile[0] == '|' ? ERRORLOG_PIPE : ERRORLOG_FILE;
 739     }
 740
 741     if (srv->errorlog_mode == ERRORLOG_FD && !srv->srvconf.dont_daemonize) {
 742         /* We can only log to stderr in dont-daemonize mode;
 743          * if we do daemonize and no errorlog file is specified,
 744          * we log into /dev/null
 745          */
 746         srv->errorlog_fd = -1;
 747     }
 748
 749     if (!buffer_string_is_empty(srv->srvconf.breakagelog_file)) {
 750         const char *logfile = srv->srvconf.breakagelog_file->ptr;
 751
 752         if (srv->errorlog_mode == ERRORLOG_FD) {
 753             srv->errorlog_fd = dup(STDERR_FILENO);
 754             fdevent_setfd_cloexec(srv->errorlog_fd);
 755         }
 756
 757         if (-1 == (errfd = fdevent_open_logger(logfile))) {
 758             log_error_write(srv, __FILE__, __LINE__, "SSSS",
 759                             "opening errorlog '", logfile,
 760                             "' failed: ", strerror(errno));
 761             return -1;
 762         }
 763
 764         if (*logfile == '|') fdevent_breakagelog_logger_pipe(errfd);
 765     }
 766     else if (!srv->srvconf.dont_daemonize) {
 767         /* move STDERR_FILENO to /dev/null */
 768         if (-1 == (errfd = fdevent_open_devnull())) {
 769             log_error_write(srv, __FILE__, __LINE__, "ss",
 770                             "opening /dev/null failed:", strerror(errno));
 771             return -1;
 772         }
 773     }
 774     else {
 775         /*(leave STDERR_FILENO as-is)*/
 776         errfd = -1;
 777     }
 778
 779     if (0 != fdevent_set_stdin_stdout_stderr(-1, -1, errfd)) {
 780         log_error_write(srv, __FILE__, __LINE__, "ss",
 781                         "setting stderr failed:", strerror(errno));
 782       #ifdef FD_CLOEXEC
 783         if (-1 != errfd) close(errfd);
 784       #endif
 785         return -1;
 786     }
 787   #ifdef FD_CLOEXEC
 788     if (-1 != errfd) close(errfd);
 789   #endif
 790
 791     return 0;
 792 }
 793
 794 /**
 795  * cycle the errorlog
 796  *
 797  */
 798
 799 static int log_error_cycle(server *srv) {
 800     /* cycle only if the error log is a file */
 801
 802     if (srv->errorlog_mode == ERRORLOG_FILE) {
 803         const char *logfile = srv->srvconf.errorlog_file->ptr;
 804         if (-1 == fdevent_cycle_logger(logfile, &srv->errorlog_fd)) {
 805             /* write to old log */
 806             log_error_write(srv, __FILE__, __LINE__, "SSSS",
 807                             "cycling errorlog '", logfile,
 808                             "' failed: ", strerror(errno));
 809         }
 810     }
 811
 812     return 0;
 813 }
 814
 815 static int log_error_close(server *srv) {
 816     switch(srv->errorlog_mode) {
 817     case ERRORLOG_PIPE:
 818     case ERRORLOG_FILE:
 819     case ERRORLOG_FD:
 820         if (-1 != srv->errorlog_fd) {
 821             /* don't close STDERR */
 822             /* fdevent_close_logger_pipes() closes ERRORLOG_PIPE */
 823             if (STDERR_FILENO != srv->errorlog_fd
 824                 && srv->errorlog_mode != ERRORLOG_PIPE) {
 825                 close(srv->errorlog_fd);
 826             }
 827             srv->errorlog_fd = -1;
 828         }
 829         break;
 830     case ERRORLOG_SYSLOG:
 831       #ifdef HAVE_SYSLOG_H
 832         closelog();
 833       #endif
 834         break;
 835     }
 836
 837     return 0;
 838 }
 839
 840 static void server_sockets_save (server *srv) {    /* graceful_restart */
 841     memcpy(&graceful_sockets, &srv->srv_sockets, sizeof(server_socket_array));
 842     memset(&srv->srv_sockets, 0, sizeof(server_socket_array));
 843 }
 844
 845 static void server_sockets_restore (server *srv) { /* graceful_restart */
 846     memcpy(&srv->srv_sockets, &graceful_sockets, sizeof(server_socket_array));
 847     memset(&graceful_sockets, 0, sizeof(server_socket_array));
 848 }
 849
 850 static int server_sockets_set_nb_cloexec (server *srv) {
 851     if (srv->sockets_disabled) return 0; /* lighttpd -1 (one-shot mode) */
 852     for (size_t i = 0; i < srv->srv_sockets.used; ++i) {
 853         server_socket *srv_socket = srv->srv_sockets.ptr[i];
 854         if (-1 == fdevent_fcntl_set_nb_cloexec_sock(srv->ev, srv_socket->fd)) {
 855             log_error_write(srv, __FILE__, __LINE__, "ss",
 856                             "fcntl failed:", strerror(errno));
 857             return -1;
 858         }
 859     }
 860     return 0;
 861 }
 862
 863 static void server_sockets_set_event (server *srv, int event) {
 864     for (size_t i = 0; i < srv->srv_sockets.used; ++i) {
 865         server_socket *srv_socket = srv->srv_sockets.ptr[i];
 866         fdevent_event_set(srv->ev,&(srv_socket->fde_ndx),srv_socket->fd,event);
 867     }
 868 }
 869
 870 static void server_sockets_unregister (server *srv) {
 871     for (size_t i = 0; i < srv->srv_sockets.used; ++i)
 872         network_unregister_sock(srv, srv->srv_sockets.ptr[i]);
 873 }
 874
 875 static void server_sockets_close (server *srv) {
 876     /* closing socket right away will make it possible for the next lighttpd
 877      * to take over (old-style graceful restart), but only if backends
 878      * (e.g. fastcgi, scgi, etc) are independent from lighttpd, rather
 879      * than started by lighttpd via "bin-path")
 880      */
 881     for (size_t i = 0; i < srv->srv_sockets.used; ++i) {
 882         server_socket *srv_socket = srv->srv_sockets.ptr[i];
 883         if (-1 == srv_socket->fd) continue;
 884         network_unregister_sock(srv, srv_socket);
 885         close(srv_socket->fd);
 886         srv_socket->fd = -1;
 887         /* network_close() will cleanup after us */
 888     }
 889 }
 890
 891 static void server_graceful_shutdown_maint (server *srv) {
 892     connections *conns = srv->conns;
 893     for (size_t ndx = 0; ndx < conns->used; ++ndx) {
 894         connection * const con = conns->ptr[ndx];
 895         int changed = 0;
 896
 897         if (con->state == CON_STATE_CLOSE) {
 898             /* reduce remaining linger timeout to be
 899              * (from zero) *up to* one more second, but no more */
 900             if (HTTP_LINGER_TIMEOUT > 1)
 901                 con->close_timeout_ts -= (HTTP_LINGER_TIMEOUT - 1);
 902             if (srv->cur_ts - con->close_timeout_ts > HTTP_LINGER_TIMEOUT)
 903                 changed = 1;
 904         }
 905         else if (con->state == CON_STATE_READ && con->request_count > 1
 906                  && chunkqueue_is_empty(con->read_queue)) {
 907             /* close connections in keep-alive waiting for next request */
 908             connection_set_state(srv, con, CON_STATE_ERROR);
 909             changed = 1;
 910         }
 911
 912         con->keep_alive = 0;                    /* disable keep-alive */
 913
 914         con->conf.kbytes_per_second = 0;        /* disable rate limit */
 915         con->conf.global_kbytes_per_second = 0; /* disable rate limit */
 916         if (con->traffic_limit_reached) {
 917             con->traffic_limit_reached = 0;
 918             changed = 1;
 919         }
 920
 921         if (changed) {
 922             connection_state_machine(srv, con);
 923         }
 924     }
 925 }
 926
 927 static void server_graceful_state (server *srv) {
 928
 929     if (!srv_shutdown) server_graceful_shutdown_maint(srv);
 930
 931     if (!oneshot_fd) {
 932         if (0==srv->srv_sockets.used || -1 == srv->srv_sockets.ptr[0]->fde_ndx)
 933             return;
 934     }
 935
 936     log_error_write(srv, __FILE__, __LINE__, "s",
 937                     "[note] graceful shutdown started");
 938
 939     /* no graceful restart if chroot()ed, if oneshot mode, or if idle timeout */
 940     if (!buffer_string_is_empty(srv->srvconf.changeroot)
 941         || oneshot_fd || 2 == graceful_shutdown)
 942         graceful_restart = 0;
 943
 944     if (graceful_restart) {
 945         server_sockets_unregister(srv);
 946         if (pid_fd > 0) pid_fd = -pid_fd; /*(flag to skip removing pid file)*/
 947     }
 948     else {
 949         server_sockets_close(srv);
 950         remove_pid_file(srv);
 951         buffer_reset(srv->srvconf.pid_file); /*(prevent more removal attempts)*/
 952     }
 953 }
 954
 955 static int server_main (server * const srv, int argc, char **argv) {
 956         int print_config = 0;
 957         int test_config = 0;
 958         int i_am_root = 0;
 959         int o;
 960 #ifdef HAVE_FORK
 961         int num_childs = 0;
 962 #endif
 963         size_t i;
 964         time_t idle_limit = 0, last_active_ts = time(NULL);
 965 #ifdef HAVE_SIGACTION
 966         struct sigaction act;
 967 #endif
 968
 969 #ifdef HAVE_FORK
 970         int parent_pipe_fd = -1;
 971 #endif
 972         int stdin_fd = -1;
 973
 974 #ifdef HAVE_GETUID
 975         i_am_root = (0 == getuid());
 976 #endif
 977
 978         /* initialize globals (including file-scoped static globals) */
 979         oneshot_fd = 0;
 980         srv_shutdown = 0;
 981         graceful_shutdown = 0;
 982         handle_sig_alarm = 1;
 983         handle_sig_hup = 0;
 984         chunkqueue_set_tempdirs_default_reset();
 985         http_auth_dumbdata_reset();
 986         http_vhostdb_dumbdata_reset();
 987         /*graceful_restart = 0;*//*(reset below to avoid further daemonizing)*/
 988         /*(intentionally preserved)*/
 989         /*memset(graceful_sockets, 0, sizeof(graceful_sockets));*/
 990         /*pid_fd = -1;*/
 991
 992         srv->srvconf.port = 0;
 993         srv->srvconf.dont_daemonize = 0;
 994         srv->srvconf.preflight_check = 0;
 995
 996         while(-1 != (o = getopt(argc, argv, "f:m:i:hvVD1pt"))) {
 997                 switch(o) {
 998                 case 'f':
 999                         if (srv->config_storage) {
1000                                 log_error_write(srv, __FILE__, __LINE__, "s",
1001                                                 "Can only read one config file. Use the include command to use multiple config files.");
1002                                 return -1;
1003                         }
1004                         if (config_read(srv, optarg)) {
1005                                 return -1;
1006                         }
1007                         break;
1008                 case 'm':
1009                         buffer_copy_string(srv->srvconf.modules_dir, optarg);
1010                         break;
1011                 case 'i': {
1012                         char *endptr;
1013                         long timeout = strtol(optarg, &endptr, 0);
1014                         if (!*optarg || *endptr || timeout < 0) {
1015                                 log_error_write(srv, __FILE__, __LINE__, "ss",
1016                                                 "Invalid idle timeout value:", optarg);
1017                                 return -1;
1018                         }
1019                         idle_limit = (time_t)timeout;
1020                         break;
1021                 }
1022                 case 'p': print_config = 1; break;
1023                 case 't': ++test_config; break;
1024                 case '1': if (0 == oneshot_fd) oneshot_fd = dup(STDIN_FILENO);
1025                           break;
1026                 case 'D': srv->srvconf.dont_daemonize = 1; break;
1027                 case 'v': show_version(); return 0;
1028                 case 'V': show_features(); return 0;
1029                 case 'h': show_help(); return 0;
1030                 default:
1031                         show_help();
1032                         return -1;
1033                 }
1034         }
1035
1036         if (!srv->config_storage) {
1037                 log_error_write(srv, __FILE__, __LINE__, "s",
1038                                 "No configuration available. Try using -f option.");
1039                 return -1;
1040         }
1041
1042         if (print_config) {
1043                 data_unset *dc = srv->config_context->data[0];
1044                 if (dc) {
1045                         dc->print(dc, 0);
1046                         fprintf(stdout, "\n");
1047                 } else {
1048                         /* shouldn't happend */
1049                         fprintf(stderr, "global config not found\n");
1050                 }
1051         }
1052
1053         if (test_config) {
1054                 buffer_reset(srv->srvconf.pid_file);
1055                 if (1 == test_config) {
1056                         printf("Syntax OK\n");
1057                 } else { /*(test_config > 1)*/
1058                         test_config = 0;
1059                         srv->srvconf.preflight_check = 1;
1060                         srv->srvconf.dont_daemonize = 1;
1061                 }
1062         }
1063
1064         if (test_config || print_config) {
1065                 return 0;
1066         }
1067
1068         if (oneshot_fd) {
1069                 if (oneshot_fd <= STDERR_FILENO) {
1070                         log_error_write(srv, __FILE__, __LINE__, "s",
1071                                         "Invalid fds at startup with lighttpd -1");
1072                         return -1;
1073                 }
1074                 graceful_shutdown = 1;
1075                 srv->sockets_disabled = 1;
1076                 srv->srvconf.dont_daemonize = 1;
1077                 buffer_reset(srv->srvconf.pid_file);
1078                 if (srv->srvconf.max_worker) {
1079                         srv->srvconf.max_worker = 0;
1080                         log_error_write(srv, __FILE__, __LINE__, "s",
1081                                         "server one-shot command line option disables server.max-worker config file option.");
1082                 }
1083         }
1084
1085         if (buffer_is_equal_string(srv->srvconf.bindhost, CONST_STR_LEN("/dev/stdin"))) {
1086                 stdin_fd = dup(STDIN_FILENO);
1087                 if (stdin_fd <= STDERR_FILENO) {
1088                         log_error_write(srv, __FILE__, __LINE__, "s",
1089                                         "Invalid fds at startup");
1090                         return -1;
1091                 }
1092         }
1093
1094         /* close stdin and stdout, as they are not needed */
1095         {
1096                 struct stat st;
1097                 int devnull;
1098                 int errfd;
1099                 do {
1100                         /* coverity[overwrite_var : FALSE] */
1101                         devnull = fdevent_open_devnull();
1102                       #ifdef __COVERITY__
1103                         __coverity_escape__(devnull);
1104                       #endif
1105                 } while (-1 != devnull && devnull <= STDERR_FILENO);
1106                 if (-1 == devnull) {
1107                         log_error_write(srv, __FILE__, __LINE__, "ss",
1108                                         "opening /dev/null failed:", strerror(errno));
1109                         return -1;
1110                 }
1111                 errfd = (0 == fstat(STDERR_FILENO, &st)) ? -1 : devnull;
1112                 if (0 != fdevent_set_stdin_stdout_stderr(devnull, devnull, errfd)) {
1113                         log_error_write(srv, __FILE__, __LINE__, "ss",
1114                                         "setting default fds failed:", strerror(errno));
1115                       #ifdef FD_CLOEXEC
1116                         if (-1 != errfd) close(errfd);
1117                         if (devnull != errfd) close(devnull);
1118                       #endif
1119                         return -1;
1120                 }
1121               #ifdef FD_CLOEXEC
1122                 if (-1 != errfd) close(errfd);
1123                 if (devnull != errfd) close(devnull);
1124               #endif
1125         }
1126
1127         if (0 != config_set_defaults(srv)) {
1128                 log_error_write(srv, __FILE__, __LINE__, "s",
1129                                 "setting default values failed");
1130                 return -1;
1131         }
1132
1133         /* check document-root */
1134         if (buffer_string_is_empty(srv->config_storage[0]->document_root)) {
1135                 log_error_write(srv, __FILE__, __LINE__, "s",
1136                                 "document-root is not set\n");
1137                 return -1;
1138         }
1139
1140         if (plugins_load(srv)) {
1141                 log_error_write(srv, __FILE__, __LINE__, "s",
1142                                 "loading plugins finally failed");
1143                 return -1;
1144         }
1145
1146         if (HANDLER_GO_ON != plugins_call_init(srv)) {
1147                 log_error_write(srv, __FILE__, __LINE__, "s", "Initialization of plugins failed. Going down.");
1148                 return -1;
1149         }
1150
1151         /* open pid file BEFORE chroot */
1152         if (-2 == pid_fd) pid_fd = -1; /*(initial startup state)*/
1153         if (-1 == pid_fd && !buffer_string_is_empty(srv->srvconf.pid_file)) {
1154                 if (-1 == (pid_fd = fdevent_open_cloexec(srv->srvconf.pid_file->ptr, O_WRONLY | O_CREAT | O_EXCL | O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH))) {
1155                         struct stat st;
1156                         if (errno != EEXIST) {
1157                                 log_error_write(srv, __FILE__, __LINE__, "sbs",
1158                                         "opening pid-file failed:", srv->srvconf.pid_file, strerror(errno));
1159                                 return -1;
1160                         }
1161
1162                         if (0 != stat(srv->srvconf.pid_file->ptr, &st)) {
1163                                 log_error_write(srv, __FILE__, __LINE__, "sbs",
1164                                                 "stating existing pid-file failed:", srv->srvconf.pid_file, strerror(errno));
1165                         }
1166
1167                         if (!S_ISREG(st.st_mode)) {
1168                                 log_error_write(srv, __FILE__, __LINE__, "sb",
1169                                                 "pid-file exists and isn't regular file:", srv->srvconf.pid_file);
1170                                 return -1;
1171                         }
1172
1173                         if (-1 == (pid_fd = fdevent_open_cloexec(srv->srvconf.pid_file->ptr, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH))) {
1174                                 log_error_write(srv, __FILE__, __LINE__, "sbs",
1175                                                 "opening pid-file failed:", srv->srvconf.pid_file, strerror(errno));
1176                                 return -1;
1177                         }
1178                 }
1179         }
1180
1181         {
1182 #ifdef HAVE_GETRLIMIT
1183                 struct rlimit rlim;
1184                 int use_rlimit = 1;
1185 #ifdef HAVE_VALGRIND_VALGRIND_H
1186                 if (RUNNING_ON_VALGRIND) use_rlimit = 0;
1187 #endif
1188
1189                 if (0 != getrlimit(RLIMIT_NOFILE, &rlim)) {
1190                         log_error_write(srv, __FILE__, __LINE__,
1191                                         "ss", "couldn't get 'max filedescriptors'",
1192                                         strerror(errno));
1193                         return -1;
1194                 }
1195
1196                 /**
1197                  * if we are not root can can't increase the fd-limit above rlim_max, but we can reduce it
1198                  */
1199                 if (use_rlimit && srv->srvconf.max_fds
1200                     && (i_am_root || srv->srvconf.max_fds <= rlim.rlim_max)) {
1201                         /* set rlimits */
1202
1203                         rlim.rlim_cur = srv->srvconf.max_fds;
1204                         if (i_am_root) rlim.rlim_max = srv->srvconf.max_fds;
1205
1206                         if (0 != setrlimit(RLIMIT_NOFILE, &rlim)) {
1207                                 log_error_write(srv, __FILE__, __LINE__,
1208                                                 "ss", "couldn't set 'max filedescriptors'",
1209                                                 strerror(errno));
1210                                 return -1;
1211                         }
1212                 }
1213
1214                         srv->max_fds = rlim.rlim_cur;
1215                         /*(default upper limit of 4k if server.max-fds not specified)*/
1216                         if (i_am_root && 0 == srv->srvconf.max_fds && rlim.rlim_cur > 4096)
1217                                 srv->max_fds = 4096;
1218
1219                 /* set core file rlimit, if enable_cores is set */
1220                 if (use_rlimit && srv->srvconf.enable_cores && getrlimit(RLIMIT_CORE, &rlim) == 0) {
1221                         rlim.rlim_cur = rlim.rlim_max;
1222                         setrlimit(RLIMIT_CORE, &rlim);
1223                 }
1224 #endif
1225         }
1226
1227         /* we need root-perms for port < 1024 */
1228         if (0 != network_init(srv, stdin_fd)) {
1229                 return -1;
1230         }
1231
1232         if (i_am_root) {
1233 #ifdef HAVE_PWD_H
1234                 /* set user and group */
1235                 struct group *grp = NULL;
1236                 struct passwd *pwd = NULL;
1237
1238                 if (!buffer_string_is_empty(srv->srvconf.groupname)) {
1239                         if (NULL == (grp = getgrnam(srv->srvconf.groupname->ptr))) {
1240                                 log_error_write(srv, __FILE__, __LINE__, "sb",
1241                                         "can't find groupname", srv->srvconf.groupname);
1242                                 return -1;
1243                         }
1244                 }
1245
1246                 if (!buffer_string_is_empty(srv->srvconf.username)) {
1247                         if (NULL == (pwd = getpwnam(srv->srvconf.username->ptr))) {
1248                                 log_error_write(srv, __FILE__, __LINE__, "sb",
1249                                                 "can't find username", srv->srvconf.username);
1250                                 return -1;
1251                         }
1252
1253                         if (pwd->pw_uid == 0) {
1254                                 log_error_write(srv, __FILE__, __LINE__, "s",
1255                                                 "I will not set uid to 0\n");
1256                                 return -1;
1257                         }
1258
1259                         if (NULL == grp && NULL == (grp = getgrgid(pwd->pw_gid))) {
1260                                 log_error_write(srv, __FILE__, __LINE__, "sd",
1261                                         "can't find group id", pwd->pw_gid);
1262                                 return -1;
1263                         }
1264                 }
1265
1266                 if (NULL != grp) {
1267                         if (grp->gr_gid == 0) {
1268                                 log_error_write(srv, __FILE__, __LINE__, "s",
1269                                                 "I will not set gid to 0\n");
1270                                 return -1;
1271                         }
1272                 }
1273
1274                 /*
1275                  * Change group before chroot, when we have access
1276                  * to /etc/group
1277                  * */
1278                 if (NULL != grp) {
1279                         if (-1 == setgid(grp->gr_gid)) {
1280                                 log_error_write(srv, __FILE__, __LINE__, "ss", "setgid failed: ", strerror(errno));
1281                                 return -1;
1282                         }
1283                         if (-1 == setgroups(0, NULL)) {
1284                                 log_error_write(srv, __FILE__, __LINE__, "ss", "setgroups failed: ", strerror(errno));
1285                                 return -1;
1286                         }
1287                         if (!buffer_string_is_empty(srv->srvconf.username)) {
1288                                 initgroups(srv->srvconf.username->ptr, grp->gr_gid);
1289                         }
1290                 }
1291 #endif
1292 #ifdef HAVE_CHROOT
1293                 if (!buffer_string_is_empty(srv->srvconf.changeroot)) {
1294                         tzset();
1295
1296                         if (-1 == chroot(srv->srvconf.changeroot->ptr)) {
1297                                 log_error_write(srv, __FILE__, __LINE__, "ss", "chroot failed: ", strerror(errno));
1298                                 return -1;
1299                         }
1300                         if (-1 == chdir("/")) {
1301                                 log_error_write(srv, __FILE__, __LINE__, "ss", "chdir failed: ", strerror(errno));
1302                                 return -1;
1303                         }
1304                 }
1305 #endif
1306 #ifdef HAVE_PWD_H
1307                 /* drop root privs */
1308                 if (NULL != pwd) {
1309                         if (-1 == setuid(pwd->pw_uid)) {
1310                                 log_error_write(srv, __FILE__, __LINE__, "ss", "setuid failed: ", strerror(errno));
1311                                 return -1;
1312                         }
1313                 }
1314 #endif
1315 #if defined(HAVE_SYS_PRCTL_H) && defined(PR_SET_DUMPABLE)
1316                 /**
1317                  * on IRIX 6.5.30 they have prctl() but no DUMPABLE
1318                  */
1319                 if (srv->srvconf.enable_cores) {
1320                         prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
1321                 }
1322 #endif
1323         }
1324
1325         /* set max-conns */
1326         if (srv->srvconf.max_conns > srv->max_fds/2) {
1327                 /* we can't have more connections than max-fds/2 */
1328                 log_error_write(srv, __FILE__, __LINE__, "sdd", "can't have more connections than fds/2: ", srv->srvconf.max_conns, srv->max_fds);
1329                 srv->max_conns = srv->max_fds/2;
1330         } else if (srv->srvconf.max_conns) {
1331                 /* otherwise respect the wishes of the user */
1332                 srv->max_conns = srv->srvconf.max_conns;
1333         } else {
1334                 /* or use the default: we really don't want to hit max-fds */
1335                 srv->max_conns = srv->max_fds/3;
1336         }
1337
1338 #ifdef HAVE_FORK
1339         /* network is up, let's daemonize ourself */
1340         if (0 == srv->srvconf.dont_daemonize && 0 == graceful_restart) {
1341                 parent_pipe_fd = daemonize();
1342         }
1343 #endif
1344         graceful_restart = 0;/*(reset here after avoiding further daemonizing)*/
1345         graceful_shutdown= 0;
1346
1347
1348 #ifdef HAVE_SIGACTION
1349         memset(&act, 0, sizeof(act));
1350         act.sa_handler = SIG_IGN;
1351         sigaction(SIGPIPE, &act, NULL);
1352 # if defined(SA_SIGINFO)
1353         last_sighup_info.si_uid = 0,
1354         last_sighup_info.si_pid = 0;
1355         last_sigterm_info.si_uid = 0,
1356         last_sigterm_info.si_pid = 0;
1357         act.sa_sigaction = sigaction_handler;
1358         sigemptyset(&act.sa_mask);
1359         act.sa_flags = SA_SIGINFO;
1360 # else
1361         act.sa_handler = signal_handler;
1362         sigemptyset(&act.sa_mask);
1363         act.sa_flags = 0;
1364 # endif
1365         sigaction(SIGINT,  &act, NULL);
1366         sigaction(SIGTERM, &act, NULL);
1367         sigaction(SIGHUP,  &act, NULL);
1368         sigaction(SIGALRM, &act, NULL);
1369         sigaction(SIGUSR1, &act, NULL);
1370
1371         /* it should be safe to restart syscalls after SIGCHLD */
1372         act.sa_flags |= SA_RESTART | SA_NOCLDSTOP;
1373         sigaction(SIGCHLD, &act, NULL);
1374
1375 #elif defined(HAVE_SIGNAL)
1376         /* ignore the SIGPIPE from sendfile() */
1377         signal(SIGPIPE, SIG_IGN);
1378         signal(SIGALRM, signal_handler);
1379         signal(SIGTERM, signal_handler);
1380         signal(SIGHUP,  signal_handler);
1381         signal(SIGCHLD,  signal_handler);
1382         signal(SIGINT,  signal_handler);
1383         signal(SIGUSR1, signal_handler);
1384 #endif
1385
1386
1387         srv->gid = getgid();
1388         srv->uid = getuid();
1389         srv->pid = getpid();
1390
1391         /* write pid file */
1392         if (pid_fd > 2) {
1393                 buffer_copy_int(srv->tmp_buf, srv->pid);
1394                 buffer_append_string_len(srv->tmp_buf, CONST_STR_LEN("\n"));
1395                 if (-1 == write_all(pid_fd, CONST_BUF_LEN(srv->tmp_buf))) {
1396                         log_error_write(srv, __FILE__, __LINE__, "ss", "Couldn't write pid file:", strerror(errno));
1397                         close(pid_fd);
1398                         pid_fd = -1;
1399                         return -1;
1400                 }
1401         } else if (pid_fd < -2) {
1402                 pid_fd = -pid_fd;
1403         }
1404
1405         /* Close stderr ASAP in the child process to make sure that nothing
1406          * is being written to that fd which may not be valid anymore. */
1407         if (!srv->srvconf.preflight_check) {
1408                 if (-1 == log_error_open(srv)) {
1409                         log_error_write(srv, __FILE__, __LINE__, "s", "Opening errorlog failed. Going down.");
1410                         return -1;
1411                 }
1412                 log_error_write(srv, __FILE__, __LINE__, "s", "server started (" PACKAGE_DESC ")");
1413         }
1414
1415         if (buffer_is_empty(srv->config_storage[0]->server_tag)) {
1416                 buffer_copy_string_len(srv->config_storage[0]->server_tag, CONST_STR_LEN(PACKAGE_DESC));
1417         }
1418
1419         if (HANDLER_GO_ON != plugins_call_set_defaults(srv)) {
1420                 log_error_write(srv, __FILE__, __LINE__, "s", "Configuration of plugins failed. Going down.");
1421                 return -1;
1422         }
1423
1424         /* settings might be enabled during module config set defaults */
1425         srv->config_storage[0]->high_precision_timestamps = srv->srvconf.high_precision_timestamps;
1426
1427         /* dump unused config-keys */
1428         for (i = 0; i < srv->config_context->used; i++) {
1429                 array *config = ((data_config *)srv->config_context->data[i])->value;
1430                 size_t j;
1431
1432                 for (j = 0; config && j < config->used; j++) {
1433                         data_unset *du = config->data[j];
1434
1435                         /* all var.* is known as user defined variable */
1436                         if (strncmp(du->key->ptr, "var.", sizeof("var.") - 1) == 0) {
1437                                 continue;
1438                         }
1439
1440                         if (NULL == array_get_element_klen(srv->config_touched, CONST_BUF_LEN(du->key))) {
1441                                 log_error_write(srv, __FILE__, __LINE__, "sbs",
1442                                                 "WARNING: unknown config-key:",
1443                                                 du->key,
1444                                                 "(ignored)");
1445                         }
1446                 }
1447         }
1448
1449         if (srv->config_unsupported) {
1450                 log_error_write(srv, __FILE__, __LINE__, "s",
1451                                 "Configuration contains unsupported keys. Going down.");
1452         }
1453
1454         if (srv->config_deprecated) {
1455                 log_error_write(srv, __FILE__, __LINE__, "s",
1456                                 "Configuration contains deprecated keys. Going down.");
1457         }
1458
1459         if (srv->config_unsupported || srv->config_deprecated) {
1460                 return -1;
1461         }
1462
1463         if (srv->srvconf.preflight_check) {
1464                 /*printf("Preflight OK");*//*(stdout reopened to /dev/null)*/
1465                 return 0;
1466         }
1467
1468
1469 #ifdef HAVE_FORK
1470         /**
1471          * notify daemonize-grandparent of successful startup
1472          * do this before any further forking is done (workers)
1473          */
1474         if (0 == srv->srvconf.dont_daemonize && -1 != parent_pipe_fd) {
1475                 if (0 > write(parent_pipe_fd, "", 1)) return -1;
1476                 close(parent_pipe_fd);
1477         }
1478
1479         if (idle_limit && srv->srvconf.max_worker) {
1480                 srv->srvconf.max_worker = 0;
1481                 log_error_write(srv, __FILE__, __LINE__, "s",
1482                                 "server idle time limit command line option disables server.max-worker config file option.");
1483         }
1484
1485         /* start watcher and workers */
1486         num_childs = srv->srvconf.max_worker;
1487         if (num_childs > 0) {
1488                 pid_t pids[num_childs];
1489                 pid_t pid;
1490                 const int npids = num_childs;
1491                 int child = 0;
1492                 unsigned int timer = 0;
1493                 for (int n = 0; n < npids; ++n) pids[n] = -1;
1494                 while (!child && !srv_shutdown && !graceful_shutdown) {
1495                         if (num_childs > 0) {
1496                                 switch ((pid = fork())) {
1497                                 case -1:
1498                                         return -1;
1499                                 case 0:
1500                                         child = 1;
1501                                         alarm(0);
1502                                         break;
1503                                 default:
1504                                         num_childs--;
1505                                         for (int n = 0; n < npids; ++n) {
1506                                                 if (-1 == pids[n]) {
1507                                                         pids[n] = pid;
1508                                                         break;
1509                                                 }
1510                                         }
1511                                         break;
1512                                 }
1513                         } else {
1514                                 int status;
1515
1516                                 if (-1 != (pid = wait(&status))) {
1517                                         srv->cur_ts = time(NULL);
1518                                         if (plugins_call_handle_waitpid(srv, pid, status) != HANDLER_GO_ON) {
1519                                                 if (!timer) alarm((timer = 5));
1520                                                 continue;
1521                                         }
1522                                         switch (fdevent_reaped_logger_pipe(pid)) {
1523                                           default: break;
1524                                           case -1: if (!timer) alarm((timer = 5));
1525                                                    /* fall through */
1526                                           case  1: continue;
1527                                         }
1528                                         /**
1529                                          * check if one of our workers went away
1530                                          */
1531                                         for (int n = 0; n < npids; ++n) {
1532                                                 if (pid == pids[n]) {
1533                                                         pids[n] = -1;
1534                                                         num_childs++;
1535                                                         break;
1536                                                 }
1537                                         }
1538                                 } else {
1539                                         switch (errno) {
1540                                         case EINTR:
1541                                                 srv->cur_ts = time(NULL);
1542                                                 /**
1543                                                  * if we receive a SIGHUP we have to close our logs ourself as we don't
1544                                                  * have the mainloop who can help us here
1545                                                  */
1546                                                 if (handle_sig_hup) {
1547                                                         handle_sig_hup = 0;
1548
1549                                                         log_error_cycle(srv);
1550
1551                                                         /* forward SIGHUP to workers */
1552                                                         for (int n = 0; n < npids; ++n) {
1553                                                                 if (pids[n] > 0) kill(pids[n], SIGHUP);
1554                                                         }
1555                                                 }
1556                                                 if (handle_sig_alarm) {
1557                                                         handle_sig_alarm = 0;
1558                                                         timer = 0;
1559                                                         plugins_call_handle_trigger(srv);
1560                                                         fdevent_restart_logger_pipes(srv->cur_ts);
1561                                                 }
1562                                                 break;
1563                                         default:
1564                                                 break;
1565                                         }
1566                                 }
1567                         }
1568                 }
1569
1570                 /**
1571                  * for the parent this is the exit-point
1572                  */
1573                 if (!child) {
1574                         /**
1575                          * kill all children too
1576                          */
1577                         if (graceful_shutdown || graceful_restart) {
1578                                 /* flag to ignore one SIGINT if graceful_restart */
1579                                 if (graceful_restart) graceful_restart = 2;
1580                                 kill(0, SIGINT);
1581                                 server_graceful_state(srv);
1582                         } else if (srv_shutdown) {
1583                                 kill(0, SIGTERM);
1584                         }
1585
1586                         return 0;
1587                 }
1588
1589                 /* ignore SIGUSR1 in workers; only parent directs graceful restart */
1590               #ifdef HAVE_SIGACTION
1591                 {
1592                         struct sigaction actignore;
1593                         memset(&actignore, 0, sizeof(actignore));
1594                         actignore.sa_handler = SIG_IGN;
1595                         sigaction(SIGUSR1, &actignore, NULL);
1596                 }
1597               #elif defined(HAVE_SIGNAL)
1598                         signal(SIGUSR1, SIG_IGN);
1599               #endif
1600
1601                 /**
1602                  * make sure workers do not muck with pid-file
1603                  */
1604                 if (0 <= pid_fd) {
1605                         close(pid_fd);
1606                         pid_fd = -1;
1607                 }
1608                 buffer_reset(srv->srvconf.pid_file);
1609
1610                 fdevent_clr_logger_pipe_pids();
1611                 srv->pid = getpid();
1612                 li_rand_reseed();
1613         }
1614 #endif
1615
1616         if (NULL == (srv->ev = fdevent_init(srv))) {
1617                 log_error_write(srv, __FILE__, __LINE__,
1618                                 "s", "fdevent_init failed");
1619                 return -1;
1620         }
1621
1622         /* libev backend overwrites our SIGCHLD handler and calls waitpid on SIGCHLD; we want our own SIGCHLD handling. */
1623 #ifdef HAVE_SIGACTION
1624         sigaction(SIGCHLD, &act, NULL);
1625 #elif defined(HAVE_SIGNAL)
1626         signal(SIGCHLD,  signal_handler);
1627 #endif
1628
1629         /*
1630          * kqueue() is called here, select resets its internals,
1631          * all server sockets get their handlers
1632          *
1633          * */
1634         if (0 != network_register_fdevents(srv)) {
1635                 return -1;
1636         }
1637
1638         /* might fail if user is using fam (not gamin) and famd isn't running */
1639         if (NULL == (srv->stat_cache = stat_cache_init(srv))) {
1640                 log_error_write(srv, __FILE__, __LINE__, "s",
1641                         "stat-cache could not be setup, dieing.");
1642                 return -1;
1643         }
1644
1645 #ifdef USE_ALARM
1646         {
1647                 /* setup periodic timer (1 second) */
1648                 struct itimerval interval;
1649                 interval.it_interval.tv_sec = 1;
1650                 interval.it_interval.tv_usec = 0;
1651                 interval.it_value.tv_sec = 1;
1652                 interval.it_value.tv_usec = 0;
1653                 if (setitimer(ITIMER_REAL, &interval, NULL)) {
1654                         log_error_write(srv, __FILE__, __LINE__, "s", "setting timer failed");
1655                         return -1;
1656                 }
1657         }
1658 #endif
1659
1660
1661         /* get the current number of FDs */
1662         {
1663                 int fd = fdevent_open_devnull();
1664                 if (fd >= 0) {
1665                         srv->cur_fds = fd;
1666                         close(fd);
1667                 }
1668         }
1669
1670         if (0 != server_sockets_set_nb_cloexec(srv)) {
1671                 return -1;
1672         }
1673
1674         if (oneshot_fd && server_oneshot_init(srv, oneshot_fd)) {
1675                 oneshot_fd = -1;
1676         }
1677
1678         /* main-loop */
1679         while (!srv_shutdown) {
1680                 int n;
1681                 size_t ndx;
1682                 time_t min_ts;
1683
1684                 if (handle_sig_hup) {
1685                         handler_t r;
1686
1687                         /* reset notification */
1688                         handle_sig_hup = 0;
1689
1690
1691                         /* cycle logfiles */
1692
1693                         switch(r = plugins_call_handle_sighup(srv)) {
1694                         case HANDLER_GO_ON:
1695                                 break;
1696                         default:
1697                                 log_error_write(srv, __FILE__, __LINE__, "sd", "sighup-handler return with an error", r);
1698                                 break;
1699                         }
1700
1701                         if (-1 == log_error_cycle(srv)) {
1702                                 log_error_write(srv, __FILE__, __LINE__, "s", "cycling errorlog failed, dying");
1703
1704                                 return -1;
1705                         } else {
1706 #ifdef HAVE_SIGACTION
1707                                 log_error_write(srv, __FILE__, __LINE__, "sdsd",
1708                                         "logfiles cycled UID =",
1709                                         last_sighup_info.si_uid,
1710                                         "PID =",
1711                                         last_sighup_info.si_pid);
1712 #else
1713                                 log_error_write(srv, __FILE__, __LINE__, "s",
1714                                         "logfiles cycled");
1715 #endif
1716                         }
1717                 }
1718
1719                 if (handle_sig_alarm) {
1720                         /* a new second */
1721
1722 #ifdef USE_ALARM
1723                         /* reset notification */
1724                         handle_sig_alarm = 0;
1725 #endif
1726
1727                         /* get current time */
1728                         min_ts = time(NULL);
1729
1730                         if (min_ts != srv->cur_ts) {
1731 #ifdef DEBUG_CONNECTION_STATES
1732                                 int cs = 0;
1733 #endif
1734                                 connections *conns = srv->conns;
1735                                 handler_t r;
1736
1737                                 switch(r = plugins_call_handle_trigger(srv)) {
1738                                 case HANDLER_GO_ON:
1739                                         break;
1740                                 case HANDLER_ERROR:
1741                                         log_error_write(srv, __FILE__, __LINE__, "s", "one of the triggers failed");
1742                                         break;
1743                                 default:
1744                                         log_error_write(srv, __FILE__, __LINE__, "d", r);
1745                                         break;
1746                                 }
1747
1748                                 srv->cur_ts = min_ts;
1749
1750                                 /* check idle time limit, if enabled */
1751                                 if (idle_limit && idle_limit < min_ts - last_active_ts && !graceful_shutdown) {
1752                                         log_error_write(srv, __FILE__, __LINE__, "sDs", "[note] idle timeout", (int)idle_limit,
1753                                                         "s exceeded, initiating graceful shutdown");
1754                                         graceful_shutdown = 2; /* value 2 indicates idle timeout */
1755                                         if (graceful_restart) {
1756                                                 graceful_restart = 0;
1757                                                 if (pid_fd < -2) pid_fd = -pid_fd;
1758                                                 server_sockets_close(srv);
1759                                         }
1760                                 }
1761
1762                               #ifdef HAVE_GETLOADAVG
1763                                 /* refresh loadavg data every 30 seconds */
1764                                 if (srv->srvconf.loadts + 30 < min_ts) {
1765                                         if (-1 != getloadavg(srv->srvconf.loadavg, 3)) {
1766                                                 srv->srvconf.loadts = min_ts;
1767                                         }
1768                                 }
1769                               #endif
1770
1771                                 /* cleanup stat-cache */
1772                                 stat_cache_trigger_cleanup(srv);
1773                                 /* reset global/aggregate rate limit counters */
1774                                 for (i = 0; i < srv->config_context->used; ++i) {
1775                                         srv->config_storage[i]->global_bytes_per_second_cnt = 0;
1776                                 }
1777                                 /* if graceful_shutdown, accelerate cleanup of recently completed request/responses */
1778                                 if (graceful_shutdown && !srv_shutdown) server_graceful_shutdown_maint(srv);
1779                                 /**
1780                                  * check all connections for timeouts
1781                                  *
1782                                  */
1783                                 for (ndx = 0; ndx < conns->used; ndx++) {
1784                                         connection * const con = conns->ptr[ndx];
1785                                         const int waitevents = fdevent_event_get_interest(srv->ev, con->fd);
1786                                         int changed = 0;
1787                                         int t_diff;
1788
1789                                         if (con->state == CON_STATE_CLOSE) {
1790                                                 if (srv->cur_ts - con->close_timeout_ts > HTTP_LINGER_TIMEOUT) {
1791                                                         changed = 1;
1792                                                 }
1793                                         } else if (waitevents & FDEVENT_IN) {
1794                                                 if (con->request_count == 1 || con->state != CON_STATE_READ) { /* e.g. CON_STATE_READ_POST || CON_STATE_WRITE */
1795                                                         if (srv->cur_ts - con->read_idle_ts > con->conf.max_read_idle) {
1796                                                                 /* time - out */
1797                                                                 if (con->conf.log_request_handling) {
1798                                                                         log_error_write(srv, __FILE__, __LINE__, "sd",
1799                                                                                 "connection closed - read timeout:", con->fd);
1800                                                                 }
1801
1802                                                                 connection_set_state(srv, con, CON_STATE_ERROR);
1803                                                                 changed = 1;
1804                                                         }
1805                                                 } else {
1806                                                         if (srv->cur_ts - con->read_idle_ts > con->keep_alive_idle) {
1807                                                                 /* time - out */
1808                                                                 if (con->conf.log_request_handling) {
1809                                                                         log_error_write(srv, __FILE__, __LINE__, "sd",
1810                                                                                 "connection closed - keep-alive timeout:", con->fd);
1811                                                                 }
1812
1813                                                                 connection_set_state(srv, con, CON_STATE_ERROR);
1814                                                                 changed = 1;
1815                                                         }
1816                                                 }
1817                                         }
1818
1819                                         /* max_write_idle timeout currently functions as backend timeout,
1820                                          * too, after response has been started.
1821                                          * future: have separate backend timeout, and then change this
1822                                          * to check for write interest before checking for timeout */
1823                                         /*if (waitevents & FDEVENT_OUT)*/
1824                                         if ((con->state == CON_STATE_WRITE) &&
1825                                             (con->write_request_ts != 0)) {
1826 #if 0
1827                                                 if (srv->cur_ts - con->write_request_ts > 60) {
1828                                                         log_error_write(srv, __FILE__, __LINE__, "sdd",
1829                                                                         "connection closed - pre-write-request-timeout:", con->fd, srv->cur_ts - con->write_request_ts);
1830                                                 }
1831 #endif
1832
1833                                                 if (srv->cur_ts - con->write_request_ts > con->conf.max_write_idle) {
1834                                                         /* time - out */
1835                                                         if (con->conf.log_timeouts) {
1836                                                                 log_error_write(srv, __FILE__, __LINE__, "sbsbsosds",
1837                                                                         "NOTE: a request from",
1838                                                                         con->dst_addr_buf,
1839                                                                         "for",
1840                                                                         con->request.uri,
1841                                                                         "timed out after writing",
1842                                                                         con->bytes_written,
1843                                                                         "bytes. We waited",
1844                                                                         (int)con->conf.max_write_idle,
1845                                                                         "seconds. If this a problem increase server.max-write-idle");
1846                                                         }
1847                                                         connection_set_state(srv, con, CON_STATE_ERROR);
1848                                                         changed = 1;
1849                                                 }
1850                                         }
1851
1852                                         /* we don't like div by zero */
1853                                         if (0 == (t_diff = srv->cur_ts - con->connection_start)) t_diff = 1;
1854
1855                                         if (con->traffic_limit_reached &&
1856                                             (con->conf.kbytes_per_second == 0 ||
1857                                              ((con->bytes_written / t_diff) < con->conf.kbytes_per_second * 1024))) {
1858                                                 /* enable connection again */
1859                                                 con->traffic_limit_reached = 0;
1860
1861                                                 changed = 1;
1862                                         }
1863
1864                                         con->bytes_written_cur_second = 0;
1865
1866                                         if (changed) {
1867                                                 connection_state_machine(srv, con);
1868                                         }
1869
1870 #if DEBUG_CONNECTION_STATES
1871                                         if (cs == 0) {
1872                                                 fprintf(stderr, "connection-state: ");
1873                                                 cs = 1;
1874                                         }
1875
1876                                         fprintf(stderr, "c[%d,%d]: %s ",
1877                                                 con->fd,
1878                                                 con->fcgi.fd,
1879                                                 connection_get_state(con->state));
1880 #endif
1881                                 }
1882
1883 #ifdef DEBUG_CONNECTION_STATES
1884                                 if (cs == 1) fprintf(stderr, "\n");
1885 #endif
1886                         }
1887                 }
1888
1889                 if (handle_sig_child) {
1890                         pid_t pid;
1891                         handle_sig_child = 0;
1892                         do {
1893                                 int status;
1894                                 pid = waitpid(-1, &status, WNOHANG);
1895                                 if (pid > 0) {
1896                                         if (plugins_call_handle_waitpid(srv, pid, status) != HANDLER_GO_ON) {
1897                                                 continue;
1898                                         }
1899                                         if (0 == srv->srvconf.max_worker) {
1900                                                 /* check piped-loggers and restart, even if shutting down */
1901                                                 if (fdevent_waitpid_logger_pipe_pid(pid, srv->cur_ts)) {
1902                                                         continue;
1903                                                 }
1904                                         }
1905                                 }
1906                         } while (pid > 0 || (-1 == pid && errno == EINTR));
1907                 }
1908
1909                 if (graceful_shutdown) {
1910                         server_graceful_state(srv);
1911                         srv->sockets_disabled = 1;
1912                 } else if (srv->sockets_disabled) {
1913                         /* our server sockets are disabled, why ? */
1914
1915                         if ((srv->cur_fds + srv->want_fds < srv->max_fds * 8 / 10) && /* we have enough unused fds */
1916                             (srv->conns->used <= srv->max_conns * 9 / 10)) {
1917                                 server_sockets_set_event(srv, FDEVENT_IN);
1918                                 log_error_write(srv, __FILE__, __LINE__, "s", "[note] sockets enabled again");
1919
1920                                 srv->sockets_disabled = 0;
1921                         }
1922                 } else {
1923                         if ((srv->cur_fds + srv->want_fds > srv->max_fds * 9 / 10) || /* out of fds */
1924                             (srv->conns->used >= srv->max_conns)) { /* out of connections */
1925                                 /* disable server-fds */
1926                                 server_sockets_set_event(srv, 0);
1927
1928                                 if (srv->conns->used >= srv->max_conns) {
1929                                         log_error_write(srv, __FILE__, __LINE__, "s", "[note] sockets disabled, connection limit reached");
1930                                 } else {
1931                                         log_error_write(srv, __FILE__, __LINE__, "s", "[note] sockets disabled, out-of-fds");
1932                                 }
1933
1934                                 srv->sockets_disabled = 1;
1935                         }
1936                 }
1937
1938                 if (graceful_shutdown && srv->conns->used == 0) {
1939                         /* we are in graceful shutdown phase and all connections are closed
1940                          * we are ready to terminate without harming anyone */
1941                         srv_shutdown = 1;
1942                         break;
1943                 }
1944
1945                 /* we still have some fds to share */
1946                 if (srv->want_fds) {
1947                         /* check the fdwaitqueue for waiting fds */
1948                         int free_fds = srv->max_fds - srv->cur_fds - 16;
1949                         connection *con;
1950
1951                         for (; free_fds > 0 && NULL != (con = fdwaitqueue_unshift(srv, srv->fdwaitqueue)); free_fds--) {
1952                                 connection_state_machine(srv, con);
1953
1954                                 srv->want_fds--;
1955                         }
1956                 }
1957
1958                 if ((n = fdevent_poll(srv->ev, 1000)) > 0) {
1959                         /* n is the number of events */
1960                         int fd;
1961                         int revents;
1962                         int fd_ndx;
1963                         last_active_ts = srv->cur_ts;
1964                         fd_ndx = -1;
1965                         do {
1966                                 fdevent_handler handler;
1967                                 void *context;
1968
1969                                 fd_ndx  = fdevent_event_next_fdndx (srv->ev, fd_ndx);
1970                                 if (-1 == fd_ndx) break; /* not all fdevent handlers know how many fds got an event */
1971
1972                                 revents = fdevent_event_get_revent (srv->ev, fd_ndx);
1973                                 fd      = fdevent_event_get_fd     (srv->ev, fd_ndx);
1974                                 handler = fdevent_get_handler(srv->ev, fd);
1975                                 context = fdevent_get_context(srv->ev, fd);
1976                                 if (NULL != handler) {
1977                                         (*handler)(srv, context, revents);
1978                                 }
1979                         } while (--n > 0);
1980                 } else if (n < 0 && errno != EINTR) {
1981                         log_error_write(srv, __FILE__, __LINE__, "ss",
1982                                         "fdevent_poll failed:",
1983                                         strerror(errno));
1984                 }
1985
1986                 if (n >= 0) fdevent_sched_run(srv, srv->ev);
1987
1988                 for (ndx = 0; ndx < srv->joblist->used; ndx++) {
1989                         connection *con = srv->joblist->ptr[ndx];
1990                         connection_state_machine(srv, con);
1991                 }
1992
1993                 srv->joblist->used = 0;
1994         }
1995
1996         if (graceful_shutdown || graceful_restart) {
1997                 server_graceful_state(srv);
1998         }
1999
2000         if (2 == graceful_shutdown) { /* value 2 indicates idle timeout */
2001                 log_error_write(srv, __FILE__, __LINE__, "s",
2002                                 "server stopped after idle timeout");
2003         } else {
2004 #ifdef HAVE_SIGACTION
2005                 log_error_write(srv, __FILE__, __LINE__, "sdsd",
2006                                 "server stopped by UID =",
2007                                 last_sigterm_info.si_uid,
2008                                 "PID =",
2009                                 last_sigterm_info.si_pid);
2010 #else
2011                 log_error_write(srv, __FILE__, __LINE__, "s",
2012                                 "server stopped");
2013 #endif
2014         }
2015
2016         return 0;
2017 }
2018
2019 int main (int argc, char **argv) {
2020     int rc;
2021
2022   #ifdef HAVE_GETUID
2023   #ifndef HAVE_ISSETUGID
2024   #define issetugid() (geteuid() != getuid() || getegid() != getgid())
2025   #endif
2026     if (0 != getuid() && issetugid()) { /*check as early as possible in main()*/
2027         fprintf(stderr,
2028                 "Are you nuts ? Don't apply a SUID bit to this binary\n");
2029         return -1;
2030     }
2031   #endif
2032
2033     /* for nice %b handling in strftime() */
2034     setlocale(LC_TIME, "C");
2035
2036     do {
2037         server * const srv = server_init();
2038
2039         if (graceful_restart) {
2040             server_sockets_restore(srv);
2041             optind = 1;
2042         }
2043
2044         rc = server_main(srv, argc, argv);
2045
2046         /* clean-up */
2047         remove_pid_file(srv);
2048         log_error_close(srv);
2049         fdevent_close_logger_pipes();
2050         if (graceful_restart)
2051             server_sockets_save(srv);
2052         else
2053             network_close(srv);
2054         connections_free(srv);
2055         plugins_free(srv);
2056         server_free(srv);
2057
2058         if (0 != rc || !graceful_restart) break;
2059
2060         /* wait for all children to exit before graceful restart */
2061         while (waitpid(-1, NULL, 0) > 0) ;
2062     } while (graceful_restart);
2063
2064     return rc;
2065 }