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 "smbd/process_model.h"
  35 #include "param/secrets.h"
  36 #include "smbd/pidfile.h"
  37 #include "param/param.h"
  38 #include "dsdb/samdb/samdb.h"
  39 #include "auth/session.h"
  40 #include "lib/messaging/irpc.h"
  41 #include "librpc/gen_ndr/ndr_irpc.h"
  42 #include "cluster/cluster.h"
  43 #include "dynconfig/dynconfig.h"
  44
  45 /*
  46   recursively delete a directory tree
  47 */
  48 static void recursive_delete(const char *path)
  49 {
  50         DIR *dir;
  51         struct dirent *de;
  52
  53         dir = opendir(path);
  54         if (!dir) {
  55                 return;
  56         }
  57
  58         for (de=readdir(dir);de;de=readdir(dir)) {
  59                 char *fname;
  60                 struct stat st;
  61
  62                 if (ISDOT(de->d_name) || ISDOTDOT(de->d_name)) {
  63                         continue;
  64                 }
  65
  66                 fname = talloc_asprintf(path, "%s/%s", path, de->d_name);
  67                 if (stat(fname, &st) != 0) {
  68                         continue;
  69                 }
  70                 if (S_ISDIR(st.st_mode)) {
  71                         recursive_delete(fname);
  72                         talloc_free(fname);
  73                         continue;
  74                 }
  75                 if (unlink(fname) != 0) {
  76                         DEBUG(0,("Unabled to delete '%s' - %s\n",
  77                                  fname, strerror(errno)));
  78                         smb_panic("unable to cleanup tmp files");
  79                 }
  80                 talloc_free(fname);
  81         }
  82         closedir(dir);
  83 }
  84
  85 /*
  86   cleanup temporary files. This is the new alternative to
  87   TDB_CLEAR_IF_FIRST. Unfortunately TDB_CLEAR_IF_FIRST is not
  88   efficient on unix systems due to the lack of scaling of the byte
  89   range locking system. So instead of putting the burden on tdb to
  90   cleanup tmp files, this function deletes them.
  91 */
  92 static void cleanup_tmp_files(struct loadparm_context *lp_ctx)
  93 {
  94         char *path;
  95         TALLOC_CTX *mem_ctx = talloc_new(NULL);
  96
  97         path = smbd_tmp_path(mem_ctx, lp_ctx, NULL);
  98
  99         recursive_delete(path);
 100         talloc_free(mem_ctx);
 101 }
 102
 103 static void sig_hup(int sig)
 104 {
 105         debug_schedule_reopen_logs();
 106 }
 107
 108 static void sig_term(int sig)
 109 {
 110 #if HAVE_GETPGRP
 111         static int done_sigterm;
 112         if (done_sigterm == 0 && getpgrp() == getpid()) {
 113                 DEBUG(0,("SIGTERM: killing children\n"));
 114                 done_sigterm = 1;
 115                 kill(-getpgrp(), SIGTERM);
 116         }
 117 #endif
 118         DEBUG(0,("Exiting pid %d on SIGTERM\n", (int)getpid()));
 119         exit(0);
 120 }
 121
 122 /*
 123   setup signal masks
 124 */
 125 static void setup_signals(void)
 126 {
 127         /* we are never interested in SIGPIPE */
 128         BlockSignals(true,SIGPIPE);
 129
 130 #if defined(SIGFPE)
 131         /* we are never interested in SIGFPE */
 132         BlockSignals(true,SIGFPE);
 133 #endif
 134
 135         /* We are no longer interested in USR1 */
 136         BlockSignals(true, SIGUSR1);
 137
 138 #if defined(SIGUSR2)
 139         /* We are no longer interested in USR2 */
 140         BlockSignals(true,SIGUSR2);
 141 #endif
 142
 143         /* POSIX demands that signals are inherited. If the invoking process has
 144          * these signals masked, we will have problems, as we won't receive them. */
 145         BlockSignals(false, SIGHUP);
 146         BlockSignals(false, SIGTERM);
 147
 148         CatchSignal(SIGHUP, sig_hup);
 149         CatchSignal(SIGTERM, sig_term);
 150 }
 151
 152 /*
 153   handle io on stdin
 154 */
 155 static void server_stdin_handler(struct tevent_context *event_ctx, struct tevent_fd *fde,
 156                                  uint16_t flags, void *private_data)
 157 {
 158         const char *binary_name = (const char *)private_data;
 159         uint8_t c;
 160         if (read(0, &c, 1) == 0) {
 161                 DEBUG(0,("%s: EOF on stdin - terminating\n", binary_name));
 162 #if HAVE_GETPGRP
 163                 if (getpgrp() == getpid()) {
 164                         DEBUG(0,("Sending SIGTERM from pid %d\n", (int)getpid()));
 165                         kill(-getpgrp(), SIGTERM);
 166                 }
 167 #endif
 168                 exit(0);
 169         }
 170 }
 171
 172 /*
 173   die if the user selected maximum runtime is exceeded
 174 */
 175 _NORETURN_ static void max_runtime_handler(struct tevent_context *ev,
 176                                            struct tevent_timer *te,
 177                                            struct timeval t, void *private_data)
 178 {
 179         const char *binary_name = (const char *)private_data;
 180         DEBUG(0,("%s: maximum runtime exceeded - terminating\n", binary_name));
 181         exit(0);
 182 }
 183
 184 /*
 185   pre-open the key databases. This saves a lot of time in child
 186   processes
 187  */
 188 static void prime_ldb_databases(struct tevent_context *event_ctx)
 189 {
 190         TALLOC_CTX *db_context;
 191         db_context = talloc_new(event_ctx);
 192
 193         samdb_connect(db_context, event_ctx, cmdline_lp_ctx, system_session(cmdline_lp_ctx));
 194         privilege_connect(db_context, event_ctx, cmdline_lp_ctx);
 195
 196         /* we deliberately leave these open, which allows them to be
 197          * re-used in ldb_wrap_connect() */
 198 }
 199
 200
 201 /*
 202   called when a fatal condition occurs in a child task
 203  */
 204 static NTSTATUS samba_terminate(struct irpc_message *msg,
 205                                 struct samba_terminate *r)
 206 {
 207         DEBUG(0,("samba_terminate: %s\n", r->in.reason));
 208         exit(1);
 209 }
 210
 211 /*
 212   setup messaging for the top level samba (parent) task
 213  */
 214 static NTSTATUS setup_parent_messaging(struct tevent_context *event_ctx,
 215                                        struct loadparm_context *lp_ctx)
 216 {
 217         struct messaging_context *msg;
 218         NTSTATUS status;
 219
 220         msg = messaging_init(talloc_autofree_context(),
 221                              lp_messaging_path(event_ctx, lp_ctx),
 222                              cluster_id(0, SAMBA_PARENT_TASKID),
 223                              lp_iconv_convenience(lp_ctx),
 224                              event_ctx);
 225         NT_STATUS_HAVE_NO_MEMORY(msg);
 226
 227         irpc_add_name(msg, "samba");
 228
 229         status = IRPC_REGISTER(msg, irpc, SAMBA_TERMINATE,
 230                                samba_terminate, NULL);
 231
 232         return status;
 233 }
 234
 235
 236 /*
 237   show build info
 238  */
 239 static void show_build(void)
 240 {
 241 #define CONFIG_OPTION(n) { #n, dyn_ ## n }
 242         struct {
 243                 const char *name;
 244                 const char *value;
 245         } config_options[] = {
 246                 CONFIG_OPTION(BINDIR),
 247                 CONFIG_OPTION(SBINDIR),
 248                 CONFIG_OPTION(CONFIGFILE),
 249                 CONFIG_OPTION(NCALRPCDIR),
 250                 CONFIG_OPTION(LOGFILEBASE),
 251                 CONFIG_OPTION(LMHOSTSFILE),
 252                 CONFIG_OPTION(DATADIR),
 253                 CONFIG_OPTION(MODULESDIR),
 254                 CONFIG_OPTION(LOCKDIR),
 255                 CONFIG_OPTION(PIDDIR),
 256                 CONFIG_OPTION(PRIVATE_DIR),
 257                 CONFIG_OPTION(SETUPDIR),
 258                 CONFIG_OPTION(WINBINDD_SOCKET_DIR),
 259                 CONFIG_OPTION(WINBINDD_PRIVILEGED_SOCKET_DIR),
 260                 CONFIG_OPTION(NTP_SIGND_SOCKET_DIR),
 261                 { NULL, NULL}
 262         };
 263         int i;
 264
 265         printf("Build environment:\n");
 266 #ifdef BUILD_SYSTEM
 267         printf("   Build host:  %s\n", BUILD_SYSTEM);
 268 #endif
 269
 270         printf("Paths:\n");
 271         for (i=0; config_options[i].name; i++) {
 272                 printf("   %s: %s\n", config_options[i].name, config_options[i].value);
 273         }
 274
 275         exit(0);
 276 }
 277
 278 /*
 279  main server.
 280 */
 281 static int binary_smbd_main(const char *binary_name, int argc, const char *argv[])
 282 {
 283         bool opt_daemon = false;
 284         bool opt_interactive = false;
 285         int opt;
 286         poptContext pc;
 287         extern NTSTATUS server_service_wrepl_init(void);
 288         extern NTSTATUS server_service_kdc_init(void);
 289         extern NTSTATUS server_service_ldap_init(void);
 290         extern NTSTATUS server_service_web_init(void);
 291         extern NTSTATUS server_service_ldap_init(void);
 292         extern NTSTATUS server_service_winbind_init(void);
 293         extern NTSTATUS server_service_nbtd_init(void);
 294         extern NTSTATUS server_service_auth_init(void);
 295         extern NTSTATUS server_service_cldapd_init(void);
 296         extern NTSTATUS server_service_smb_init(void);
 297         extern NTSTATUS server_service_drepl_init(void);
 298         extern NTSTATUS server_service_kcc_init(void);
 299         extern NTSTATUS server_service_dnsupdate_init(void);
 300         extern NTSTATUS server_service_rpc_init(void);
 301         extern NTSTATUS server_service_ntp_signd_init(void);
 302         extern NTSTATUS server_service_samba3_smb_init(void);
 303         init_module_fn static_init[] = { STATIC_service_MODULES };
 304         init_module_fn *shared_init;
 305         struct tevent_context *event_ctx;
 306         uint16_t stdin_event_flags;
 307         NTSTATUS status;
 308         const char *model = "standard";
 309         int max_runtime = 0;
 310         enum {
 311                 OPT_DAEMON = 1000,
 312                 OPT_INTERACTIVE,
 313                 OPT_PROCESS_MODEL,
 314                 OPT_SHOW_BUILD
 315         };
 316         struct poptOption long_options[] = {
 317                 POPT_AUTOHELP
 318                 {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON,
 319                  "Become a daemon (default)", NULL },
 320                 {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE,
 321                  "Run interactive (not a daemon)", NULL},
 322                 {"model", 'M', POPT_ARG_STRING, NULL, OPT_PROCESS_MODEL,
 323                  "Select process model", "MODEL"},
 324                 {"maximum-runtime",0, POPT_ARG_INT, &max_runtime, 0,
 325                  "set maximum runtime of the server process, till autotermination", "seconds"},
 326                 {"show-build", 'b', POPT_ARG_NONE, NULL, OPT_SHOW_BUILD, "show build info", NULL },
 327                 POPT_COMMON_SAMBA
 328                 POPT_COMMON_VERSION
 329                 { NULL }
 330         };
 331
 332         pc = poptGetContext(binary_name, argc, argv, long_options, 0);
 333         while((opt = poptGetNextOpt(pc)) != -1) {
 334                 switch(opt) {
 335                 case OPT_DAEMON:
 336                         opt_daemon = true;
 337                         break;
 338                 case OPT_INTERACTIVE:
 339                         opt_interactive = true;
 340                         break;
 341                 case OPT_PROCESS_MODEL:
 342                         model = poptGetOptArg(pc);
 343                         break;
 344                 case OPT_SHOW_BUILD:
 345                         show_build();
 346                         break;
 347                 default:
 348                         fprintf(stderr, "\nInvalid option %s: %s\n\n",
 349                                   poptBadOption(pc, 0), poptStrerror(opt));
 350                         poptPrintUsage(pc, stderr, 0);
 351                         return 1;
 352                 }
 353         }
 354
 355         if (opt_daemon && opt_interactive) {
 356                 fprintf(stderr,"\nERROR: "
 357                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
 358                 poptPrintUsage(pc, stderr, 0);
 359                 return 1;
 360         } else if (!opt_interactive) {
 361                 /* default is --daemon */
 362                 opt_daemon = true;
 363         }
 364
 365         poptFreeContext(pc);
 366
 367         setup_logging(binary_name, opt_interactive?DEBUG_STDOUT:DEBUG_FILE);
 368         setup_signals();
 369
 370         /* we want total control over the permissions on created files,
 371            so set our umask to 0 */
 372         umask(0);
 373
 374         DEBUG(0,("%s version %s started.\n", binary_name, SAMBA_VERSION_STRING));
 375         DEBUGADD(0,("Copyright Andrew Tridgell and the Samba Team 1992-2010\n"));
 376
 377         if (sizeof(uint16_t) < 2 || sizeof(uint32_t) < 4 || sizeof(uint64_t) < 8) {
 378                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
 379                 DEBUGADD(0,("sizeof(uint16_t) = %u, sizeof(uint32_t) %u, sizeof(uint64_t) = %u\n",
 380                             (unsigned int)sizeof(uint16_t), (unsigned int)sizeof(uint32_t), (unsigned int)sizeof(uint64_t)));
 381                 return 1;
 382         }
 383
 384         if (opt_daemon) {
 385                 DEBUG(3,("Becoming a daemon.\n"));
 386                 become_daemon(true, false, false);
 387         }
 388
 389         cleanup_tmp_files(cmdline_lp_ctx);
 390
 391         if (!directory_exist(lp_lockdir(cmdline_lp_ctx))) {
 392                 mkdir(lp_lockdir(cmdline_lp_ctx), 0755);
 393         }
 394
 395         pidfile_create(lp_piddir(cmdline_lp_ctx), binary_name);
 396
 397         /* Do *not* remove this, until you have removed
 398          * passdb/secrets.c, and proved that Samba still builds... */
 399         /* Setup the SECRETS subsystem */
 400         if (secrets_init(talloc_autofree_context(), cmdline_lp_ctx) == NULL) {
 401                 return 1;
 402         }
 403
 404         gensec_init(cmdline_lp_ctx); /* FIXME: */
 405
 406         ntptr_init(cmdline_lp_ctx);     /* 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, cmdline_lp_ctx, "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         /* setup this as the default context */
 426         s4_event_context_set_default(event_ctx);
 427
 428         if (event_ctx == NULL) {
 429                 DEBUG(0,("Initializing event context failed\n"));
 430                 return 1;
 431         }
 432
 433         if (opt_interactive) {
 434                 /* terminate when stdin goes away */
 435                 stdin_event_flags = TEVENT_FD_READ;
 436         } else {
 437                 /* stay alive forever */
 438                 stdin_event_flags = 0;
 439         }
 440
 441         /* catch EOF on stdin */
 442 #ifdef SIGTTIN
 443         signal(SIGTTIN, SIG_IGN);
 444 #endif
 445         tevent_add_fd(event_ctx, event_ctx, 0, stdin_event_flags,
 446                       server_stdin_handler,
 447                       discard_const(binary_name));
 448
 449         if (max_runtime) {
 450                 tevent_add_timer(event_ctx, event_ctx,
 451                                  timeval_current_ofs(max_runtime, 0),
 452                                  max_runtime_handler,
 453                                  discard_const(binary_name));
 454         }
 455
 456         prime_ldb_databases(event_ctx);
 457
 458         status = setup_parent_messaging(event_ctx, cmdline_lp_ctx);
 459         if (!NT_STATUS_IS_OK(status)) {
 460                 DEBUG(0,("Failed to setup parent messaging - %s\n", nt_errstr(status)));
 461                 return 1;
 462         }
 463
 464         DEBUG(0,("%s: using '%s' process model\n", binary_name, model));
 465
 466         status = server_service_startup(event_ctx, cmdline_lp_ctx, model,
 467                                         lp_server_services(cmdline_lp_ctx));
 468         if (!NT_STATUS_IS_OK(status)) {
 469                 DEBUG(0,("Starting Services failed - %s\n", nt_errstr(status)));
 470                 return 1;
 471         }
 472
 473         /* wait for events - this is where smbd sits for most of its
 474            life */
 475         tevent_loop_wait(event_ctx);
 476
 477         /* as everything hangs off this event context, freeing it
 478            should initiate a clean shutdown of all services */
 479         talloc_free(event_ctx);
 480
 481         return 0;
 482 }
 483
 484 int main(int argc, const char *argv[])
 485 {
 486         return binary_smbd_main("samba", argc, argv);
 487 }