source4/smbd/server.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Main SMB server routines
   5
   6    Copyright (C) Andrew Tridgell                1992-2005
   7    Copyright (C) Martin Pool                    2002
   8    Copyright (C) Jelmer Vernooij                2002
   9    Copyright (C) James J Myers                  2003 <myersjj@samba.org>
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "lib/events/events.h"
  27 #include "version.h"
  28 #include "lib/cmdline/popt_common.h"
  29 #include "system/dir.h"
  30 #include "system/filesys.h"
  31 #include "ntvfs/ntvfs.h"
  32 #include "ntptr/ntptr.h"
  33 #include "auth/gensec/gensec.h"
  34 #include "libcli/auth/schannel.h"
  35 #include "smbd/process_model.h"
  36 #include "param/secrets.h"
  37 #include "smbd/pidfile.h"
  38 #include "param/param.h"
  39 #include "dsdb/samdb/samdb.h"
  40 #include "auth/session.h"
  41 #include "lib/messaging/irpc.h"
  42 #include "librpc/gen_ndr/ndr_irpc.h"
  43 #include "cluster/cluster.h"
  44 #include "dynconfig/dynconfig.h"
  45
  46 /*
  47   recursively delete a directory tree
  48 */
  49 static void recursive_delete(const char *path)
  50 {
  51         DIR *dir;
  52         struct dirent *de;
  53
  54         dir = opendir(path);
  55         if (!dir) {
  56                 return;
  57         }
  58
  59         for (de=readdir(dir);de;de=readdir(dir)) {
  60                 char *fname;
  61                 struct stat st;
  62
  63                 if (ISDOT(de->d_name) || ISDOTDOT(de->d_name)) {
  64                         continue;
  65                 }
  66
  67                 fname = talloc_asprintf(path, "%s/%s", path, de->d_name);
  68                 if (stat(fname, &st) != 0) {
  69                         continue;
  70                 }
  71                 if (S_ISDIR(st.st_mode)) {
  72                         recursive_delete(fname);
  73                         talloc_free(fname);
  74                         continue;
  75                 }
  76                 if (unlink(fname) != 0) {
  77                         DEBUG(0,("Unabled to delete '%s' - %s\n",
  78                                  fname, strerror(errno)));
  79                         smb_panic("unable to cleanup tmp files");
  80                 }
  81                 talloc_free(fname);
  82         }
  83         closedir(dir);
  84 }
  85
  86 /*
  87   cleanup temporary files. This is the new alternative to
  88   TDB_CLEAR_IF_FIRST. Unfortunately TDB_CLEAR_IF_FIRST is not
  89   efficient on unix systems due to the lack of scaling of the byte
  90   range locking system. So instead of putting the burden on tdb to
  91   cleanup tmp files, this function deletes them.
  92 */
  93 static void cleanup_tmp_files(struct loadparm_context *lp_ctx)
  94 {
  95         char *path;
  96         TALLOC_CTX *mem_ctx = talloc_new(NULL);
  97
  98         path = smbd_tmp_path(mem_ctx, lp_ctx, NULL);
  99
 100         recursive_delete(path);
 101         talloc_free(mem_ctx);
 102 }
 103
 104 static void sig_hup(int sig)
 105 {
 106         debug_schedule_reopen_logs();
 107 }
 108
 109 static void sig_term(int sig)
 110 {
 111 #if HAVE_GETPGRP
 112         static int done_sigterm;
 113         if (done_sigterm == 0 && getpgrp() == getpid()) {
 114                 DEBUG(0,("SIGTERM: killing children\n"));
 115                 done_sigterm = 1;
 116                 kill(-getpgrp(), SIGTERM);
 117         }
 118 #endif
 119         DEBUG(0,("Exiting pid %d on SIGTERM\n", (int)getpid()));
 120         exit(127);
 121 }
 122
 123 /*
 124   setup signal masks
 125 */
 126 static void setup_signals(void)
 127 {
 128         /* we are never interested in SIGPIPE */
 129         BlockSignals(true,SIGPIPE);
 130
 131 #if defined(SIGFPE)
 132         /* we are never interested in SIGFPE */
 133         BlockSignals(true,SIGFPE);
 134 #endif
 135
 136         /* We are no longer interested in USR1 */
 137         BlockSignals(true, SIGUSR1);
 138
 139 #if defined(SIGUSR2)
 140         /* We are no longer interested in USR2 */
 141         BlockSignals(true,SIGUSR2);
 142 #endif
 143
 144         /* POSIX demands that signals are inherited. If the invoking process has
 145          * these signals masked, we will have problems, as we won't receive them. */
 146         BlockSignals(false, SIGHUP);
 147         BlockSignals(false, SIGTERM);
 148
 149         CatchSignal(SIGHUP, sig_hup);
 150         CatchSignal(SIGTERM, sig_term);
 151 }
 152
 153 /*
 154   handle io on stdin
 155 */
 156 static void server_stdin_handler(struct tevent_context *event_ctx, struct tevent_fd *fde,
 157                                  uint16_t flags, void *private_data)
 158 {
 159         const char *binary_name = (const char *)private_data;
 160         uint8_t c;
 161         if (read(0, &c, 1) == 0) {
 162                 DEBUG(0,("%s: EOF on stdin - terminating\n", binary_name));
 163 #if HAVE_GETPGRP
 164                 if (getpgrp() == getpid()) {
 165                         DEBUG(0,("Sending SIGTERM from pid %d\n", (int)getpid()));
 166                         kill(-getpgrp(), SIGTERM);
 167                 }
 168 #endif
 169                 exit(0);
 170         }
 171 }
 172
 173 /*
 174   die if the user selected maximum runtime is exceeded
 175 */
 176 _NORETURN_ static void max_runtime_handler(struct tevent_context *ev,
 177                                            struct tevent_timer *te,
 178                                            struct timeval t, void *private_data)
 179 {
 180         const char *binary_name = (const char *)private_data;
 181         struct timeval tv;
 182         struct timezone tz;
 183         if (gettimeofday(&tv, &tz) == 0) {
 184                 DEBUG(0,("%s: maximum runtime exceeded - terminating, current ts: %d\n", binary_name, (int)tv.tv_sec));
 185         } else {
 186                 DEBUG(0,("%s: maximum runtime exceeded - terminating\n", binary_name));
 187         }
 188         exit(0);
 189 }
 190
 191 /*
 192   pre-open the key databases. This saves a lot of time in child
 193   processes
 194  */
 195 static void prime_ldb_databases(struct tevent_context *event_ctx)
 196 {
 197         TALLOC_CTX *db_context;
 198         db_context = talloc_new(event_ctx);
 199
 200         samdb_connect(db_context, event_ctx, cmdline_lp_ctx, system_session(cmdline_lp_ctx), 0);
 201         privilege_connect(db_context, cmdline_lp_ctx);
 202
 203         /* we deliberately leave these open, which allows them to be
 204          * re-used in ldb_wrap_connect() */
 205 }
 206
 207
 208 /*
 209   called when a fatal condition occurs in a child task
 210  */
 211 static NTSTATUS samba_terminate(struct irpc_message *msg,
 212                                 struct samba_terminate *r)
 213 {
 214         DEBUG(0,("samba_terminate: %s\n", r->in.reason));
 215         exit(1);
 216 }
 217
 218 /*
 219   setup messaging for the top level samba (parent) task
 220  */
 221 static NTSTATUS setup_parent_messaging(struct tevent_context *event_ctx,
 222                                        struct loadparm_context *lp_ctx)
 223 {
 224         struct imessaging_context *msg;
 225         NTSTATUS status;
 226
 227         msg = imessaging_init(talloc_autofree_context(),
 228                              lpcfg_imessaging_path(event_ctx, lp_ctx),
 229                              cluster_id(0, SAMBA_PARENT_TASKID), event_ctx);
 230         NT_STATUS_HAVE_NO_MEMORY(msg);
 231
 232         irpc_add_name(msg, "samba");
 233
 234         status = IRPC_REGISTER(msg, irpc, SAMBA_TERMINATE,
 235                                samba_terminate, NULL);
 236
 237         return status;
 238 }
 239
 240
 241 /*
 242   show build info
 243  */
 244 static void show_build(void)
 245 {
 246 #define CONFIG_OPTION(n) { #n, dyn_ ## n }
 247         struct {
 248                 const char *name;
 249                 const char *value;
 250         } config_options[] = {
 251                 CONFIG_OPTION(BINDIR),
 252                 CONFIG_OPTION(SBINDIR),
 253                 CONFIG_OPTION(CONFIGFILE),
 254                 CONFIG_OPTION(NCALRPCDIR),
 255                 CONFIG_OPTION(LOGFILEBASE),
 256                 CONFIG_OPTION(LMHOSTSFILE),
 257                 CONFIG_OPTION(DATADIR),
 258                 CONFIG_OPTION(MODULESDIR),
 259                 CONFIG_OPTION(LOCKDIR),
 260                 CONFIG_OPTION(PIDDIR),
 261                 CONFIG_OPTION(PRIVATE_DIR),
 262                 CONFIG_OPTION(SWATDIR),
 263                 CONFIG_OPTION(CODEPAGEDIR),
 264                 CONFIG_OPTION(SETUPDIR),
 265                 CONFIG_OPTION(WINBINDD_SOCKET_DIR),
 266                 CONFIG_OPTION(WINBINDD_PRIVILEGED_SOCKET_DIR),
 267                 CONFIG_OPTION(NTP_SIGND_SOCKET_DIR),
 268                 { NULL, NULL}
 269         };
 270         int i;
 271
 272         printf("Samba version: %s\n", SAMBA_VERSION_STRING);
 273         printf("Build environment:\n");
 274 #ifdef BUILD_SYSTEM
 275         printf("   Build host:  %s\n", BUILD_SYSTEM);
 276 #endif
 277
 278         printf("Paths:\n");
 279         for (i=0; config_options[i].name; i++) {
 280                 printf("   %s: %s\n", config_options[i].name, config_options[i].value);
 281         }
 282
 283         exit(0);
 284 }
 285
 286 /*
 287  main server.
 288 */
 289 static int binary_smbd_main(const char *binary_name, int argc, const char *argv[])
 290 {
 291         bool opt_daemon = false;
 292         bool opt_interactive = false;
 293         int opt;
 294         poptContext pc;
 295 #define _MODULE_PROTO(init) extern NTSTATUS init(void);
 296         STATIC_service_MODULES_PROTO;
 297         init_module_fn static_init[] = { STATIC_service_MODULES };
 298         init_module_fn *shared_init;
 299         struct tevent_context *event_ctx;
 300         uint16_t stdin_event_flags;
 301         NTSTATUS status;
 302         const char *model = "standard";
 303         int max_runtime = 0;
 304         enum {
 305                 OPT_DAEMON = 1000,
 306                 OPT_INTERACTIVE,
 307                 OPT_PROCESS_MODEL,
 308                 OPT_SHOW_BUILD
 309         };
 310         struct poptOption long_options[] = {
 311                 POPT_AUTOHELP
 312                 {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON,
 313                  "Become a daemon (default)", NULL },
 314                 {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE,
 315                  "Run interactive (not a daemon)", NULL},
 316                 {"model", 'M', POPT_ARG_STRING, NULL, OPT_PROCESS_MODEL,
 317                  "Select process model", "MODEL"},
 318                 {"maximum-runtime",0, POPT_ARG_INT, &max_runtime, 0,
 319                  "set maximum runtime of the server process, till autotermination", "seconds"},
 320                 {"show-build", 'b', POPT_ARG_NONE, NULL, OPT_SHOW_BUILD, "show build info", NULL },
 321                 POPT_COMMON_SAMBA
 322                 POPT_COMMON_VERSION
 323                 { NULL }
 324         };
 325
 326         pc = poptGetContext(binary_name, argc, argv, long_options, 0);
 327         while((opt = poptGetNextOpt(pc)) != -1) {
 328                 switch(opt) {
 329                 case OPT_DAEMON:
 330                         opt_daemon = true;
 331                         break;
 332                 case OPT_INTERACTIVE:
 333                         opt_interactive = true;
 334                         break;
 335                 case OPT_PROCESS_MODEL:
 336                         model = poptGetOptArg(pc);
 337                         break;
 338                 case OPT_SHOW_BUILD:
 339                         show_build();
 340                         break;
 341                 default:
 342                         fprintf(stderr, "\nInvalid option %s: %s\n\n",
 343                                   poptBadOption(pc, 0), poptStrerror(opt));
 344                         poptPrintUsage(pc, stderr, 0);
 345                         return 1;
 346                 }
 347         }
 348
 349         if (opt_daemon && opt_interactive) {
 350                 fprintf(stderr,"\nERROR: "
 351                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
 352                 poptPrintUsage(pc, stderr, 0);
 353                 return 1;
 354         } else if (!opt_interactive) {
 355                 /* default is --daemon */
 356                 opt_daemon = true;
 357         }
 358
 359         poptFreeContext(pc);
 360
 361         setup_logging(binary_name, opt_interactive?DEBUG_STDOUT:DEBUG_FILE);
 362         setup_signals();
 363
 364         /* we want total control over the permissions on created files,
 365            so set our umask to 0 */
 366         umask(0);
 367
 368         DEBUG(0,("%s version %s started.\n", binary_name, SAMBA_VERSION_STRING));
 369         DEBUGADD(0,("Copyright Andrew Tridgell and the Samba Team 1992-2011\n"));
 370
 371         if (sizeof(uint16_t) < 2 || sizeof(uint32_t) < 4 || sizeof(uint64_t) < 8) {
 372                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
 373                 DEBUGADD(0,("sizeof(uint16_t) = %u, sizeof(uint32_t) %u, sizeof(uint64_t) = %u\n",
 374                             (unsigned int)sizeof(uint16_t), (unsigned int)sizeof(uint32_t), (unsigned int)sizeof(uint64_t)));
 375                 return 1;
 376         }
 377
 378         if (opt_daemon) {
 379                 DEBUG(3,("Becoming a daemon.\n"));
 380                 become_daemon(true, false, false);
 381         }
 382
 383         cleanup_tmp_files(cmdline_lp_ctx);
 384
 385         if (!directory_exist(lpcfg_lockdir(cmdline_lp_ctx))) {
 386                 mkdir(lpcfg_lockdir(cmdline_lp_ctx), 0755);
 387         }
 388
 389         pidfile_create(lpcfg_piddir(cmdline_lp_ctx), binary_name);
 390
 391         /* Set up a database to hold a random seed, in case we don't
 392          * have /dev/urandom */
 393         if (!randseed_init(talloc_autofree_context(), cmdline_lp_ctx)) {
 394                 return 1;
 395         }
 396
 397         if (lpcfg_server_role(cmdline_lp_ctx) == ROLE_DOMAIN_CONTROLLER) {
 398                 if (!open_schannel_session_store(talloc_autofree_context(), lpcfg_private_dir(cmdline_lp_ctx))) {
 399                         DEBUG(0,("ERROR: Samba cannot open schannel store for secured NETLOGON operations.\n"));
 400                         exit(1);
 401                 }
 402         }
 403
 404         gensec_init(); /* FIXME: */
 405
 406         ntptr_init();   /* FIXME: maybe run this in the initialization function
 407                                                 of the spoolss RPC server instead? */
 408
 409         ntvfs_init(cmdline_lp_ctx);     /* FIXME: maybe run this in the initialization functions
 410                                                 of the SMB[,2] server instead? */
 411
 412         process_model_init(cmdline_lp_ctx);
 413
 414         shared_init = load_samba_modules(NULL, "service");
 415
 416         run_init_functions(static_init);
 417         run_init_functions(shared_init);
 418
 419         talloc_free(shared_init);
 420
 421         /* the event context is the top level structure in smbd. Everything else
 422            should hang off that */
 423         event_ctx = s4_event_context_init(talloc_autofree_context());
 424
 425         if (event_ctx == NULL) {
 426                 DEBUG(0,("Initializing event context failed\n"));
 427                 return 1;
 428         }
 429
 430         if (opt_interactive) {
 431                 /* terminate when stdin goes away */
 432                 stdin_event_flags = TEVENT_FD_READ;
 433         } else {
 434                 /* stay alive forever */
 435                 stdin_event_flags = 0;
 436         }
 437
 438         /* catch EOF on stdin */
 439 #ifdef SIGTTIN
 440         signal(SIGTTIN, SIG_IGN);
 441 #endif
 442         tevent_add_fd(event_ctx, event_ctx, 0, stdin_event_flags,
 443                       server_stdin_handler,
 444                       discard_const(binary_name));
 445
 446         if (max_runtime) {
 447                 struct timeval tv;
 448                 struct timezone tz;
 449
 450                 if (gettimeofday(&tv, &tz) == 0) {
 451                         DEBUG(0,("Called with maxruntime %d - current ts %d\n", max_runtime, (int)tv.tv_sec));
 452                 } else {
 453                         DEBUG(0,("Called with maxruntime %d\n", max_runtime));
 454                 }
 455                 tevent_add_timer(event_ctx, event_ctx,
 456                                  timeval_current_ofs(max_runtime, 0),
 457                                  max_runtime_handler,
 458                                  discard_const(binary_name));
 459         }
 460
 461         prime_ldb_databases(event_ctx);
 462
 463         status = setup_parent_messaging(event_ctx, cmdline_lp_ctx);
 464         if (!NT_STATUS_IS_OK(status)) {
 465                 DEBUG(0,("Failed to setup parent messaging - %s\n", nt_errstr(status)));
 466                 return 1;
 467         }
 468
 469         DEBUG(0,("%s: using '%s' process model\n", binary_name, model));
 470
 471         status = server_service_startup(event_ctx, cmdline_lp_ctx, model,
 472                                         lpcfg_server_services(cmdline_lp_ctx));
 473         if (!NT_STATUS_IS_OK(status)) {
 474                 DEBUG(0,("Starting Services failed - %s\n", nt_errstr(status)));
 475                 return 1;
 476         }
 477
 478         /* wait for events - this is where smbd sits for most of its
 479            life */
 480         tevent_loop_wait(event_ctx);
 481
 482         /* as everything hangs off this event context, freeing it
 483            should initiate a clean shutdown of all services */
 484         talloc_free(event_ctx);
 485
 486         return 0;
 487 }
 488
 489 int main(int argc, const char *argv[])
 490 {
 491         return binary_smbd_main("samba", argc, argv);
 492 }