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(SWATDIR),
 258                 CONFIG_OPTION(SETUPDIR),
 259                 CONFIG_OPTION(WINBINDD_SOCKET_DIR),
 260                 CONFIG_OPTION(WINBINDD_PRIVILEGED_SOCKET_DIR),
 261                 CONFIG_OPTION(NTP_SIGND_SOCKET_DIR),
 262                 { NULL, NULL}
 263         };
 264         int i;
 265
 266         printf("Paths:\n");
 267         for (i=0; config_options[i].name; i++) {
 268                 printf("   %s: %s\n", config_options[i].name, config_options[i].value);
 269         }
 270
 271         exit(0);
 272 }
 273
 274 /*
 275  main server.
 276 */
 277 static int binary_smbd_main(const char *binary_name, int argc, const char *argv[])
 278 {
 279         bool opt_daemon = false;
 280         bool opt_interactive = false;
 281         int opt;
 282         poptContext pc;
 283         extern NTSTATUS server_service_wrepl_init(void);
 284         extern NTSTATUS server_service_kdc_init(void);
 285         extern NTSTATUS server_service_ldap_init(void);
 286         extern NTSTATUS server_service_web_init(void);
 287         extern NTSTATUS server_service_ldap_init(void);
 288         extern NTSTATUS server_service_winbind_init(void);
 289         extern NTSTATUS server_service_nbtd_init(void);
 290         extern NTSTATUS server_service_auth_init(void);
 291         extern NTSTATUS server_service_cldapd_init(void);
 292         extern NTSTATUS server_service_smb_init(void);
 293         extern NTSTATUS server_service_drepl_init(void);
 294         extern NTSTATUS server_service_kcc_init(void);
 295         extern NTSTATUS server_service_dnsupdate_init(void);
 296         extern NTSTATUS server_service_rpc_init(void);
 297         extern NTSTATUS server_service_ntp_signd_init(void);
 298         extern NTSTATUS server_service_samba3_smb_init(void);
 299         init_module_fn static_init[] = { STATIC_service_MODULES };
 300         init_module_fn *shared_init;
 301         struct tevent_context *event_ctx;
 302         uint16_t stdin_event_flags;
 303         NTSTATUS status;
 304         const char *model = "standard";
 305         int max_runtime = 0;
 306         enum {
 307                 OPT_DAEMON = 1000,
 308                 OPT_INTERACTIVE,
 309                 OPT_PROCESS_MODEL,
 310                 OPT_SHOW_BUILD
 311         };
 312         struct poptOption long_options[] = {
 313                 POPT_AUTOHELP
 314                 {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON,
 315                  "Become a daemon (default)", NULL },
 316                 {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE,
 317                  "Run interactive (not a daemon)", NULL},
 318                 {"model", 'M', POPT_ARG_STRING, NULL, OPT_PROCESS_MODEL,
 319                  "Select process model", "MODEL"},
 320                 {"maximum-runtime",0, POPT_ARG_INT, &max_runtime, 0,
 321                  "set maximum runtime of the server process, till autotermination", "seconds"},
 322                 {"show-build", 'b', POPT_ARG_NONE, NULL, OPT_SHOW_BUILD, "show build info", NULL },
 323                 POPT_COMMON_SAMBA
 324                 POPT_COMMON_VERSION
 325                 { NULL }
 326         };
 327
 328         pc = poptGetContext(binary_name, argc, argv, long_options, 0);
 329         while((opt = poptGetNextOpt(pc)) != -1) {
 330                 switch(opt) {
 331                 case OPT_DAEMON:
 332                         opt_daemon = true;
 333                         break;
 334                 case OPT_INTERACTIVE:
 335                         opt_interactive = true;
 336                         break;
 337                 case OPT_PROCESS_MODEL:
 338                         model = poptGetOptArg(pc);
 339                         break;
 340                 case OPT_SHOW_BUILD:
 341                         show_build();
 342                         break;
 343                 default:
 344                         fprintf(stderr, "\nInvalid option %s: %s\n\n",
 345                                   poptBadOption(pc, 0), poptStrerror(opt));
 346                         poptPrintUsage(pc, stderr, 0);
 347                         return 1;
 348                 }
 349         }
 350
 351         if (opt_daemon && opt_interactive) {
 352                 fprintf(stderr,"\nERROR: "
 353                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
 354                 poptPrintUsage(pc, stderr, 0);
 355                 return 1;
 356         } else if (!opt_interactive) {
 357                 /* default is --daemon */
 358                 opt_daemon = true;
 359         }
 360
 361         poptFreeContext(pc);
 362
 363         setup_logging(binary_name, opt_interactive?DEBUG_STDOUT:DEBUG_FILE);
 364         setup_signals();
 365
 366         /* we want total control over the permissions on created files,
 367            so set our umask to 0 */
 368         umask(0);
 369
 370         DEBUG(0,("%s version %s started.\n", binary_name, SAMBA_VERSION_STRING));
 371         DEBUGADD(0,("Copyright Andrew Tridgell and the Samba Team 1992-2010\n"));
 372
 373         if (sizeof(uint16_t) < 2 || sizeof(uint32_t) < 4 || sizeof(uint64_t) < 8) {
 374                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
 375                 DEBUGADD(0,("sizeof(uint16_t) = %u, sizeof(uint32_t) %u, sizeof(uint64_t) = %u\n",
 376                             (unsigned int)sizeof(uint16_t), (unsigned int)sizeof(uint32_t), (unsigned int)sizeof(uint64_t)));
 377                 return 1;
 378         }
 379
 380         if (opt_daemon) {
 381                 DEBUG(3,("Becoming a daemon.\n"));
 382                 become_daemon(true, false, false);
 383         }
 384
 385         cleanup_tmp_files(cmdline_lp_ctx);
 386
 387         if (!directory_exist(lp_lockdir(cmdline_lp_ctx))) {
 388                 mkdir(lp_lockdir(cmdline_lp_ctx), 0755);
 389         }
 390
 391         pidfile_create(lp_piddir(cmdline_lp_ctx), binary_name);
 392
 393         /* Do *not* remove this, until you have removed
 394          * passdb/secrets.c, and proved that Samba still builds... */
 395         /* Setup the SECRETS subsystem */
 396         if (secrets_init(talloc_autofree_context(), cmdline_lp_ctx) == NULL) {
 397                 return 1;
 398         }
 399
 400         gensec_init(cmdline_lp_ctx); /* FIXME: */
 401
 402         ntptr_init(cmdline_lp_ctx);     /* FIXME: maybe run this in the initialization function
 403                                                 of the spoolss RPC server instead? */
 404
 405         ntvfs_init(cmdline_lp_ctx);     /* FIXME: maybe run this in the initialization functions
 406                                                 of the SMB[,2] server instead? */
 407
 408         process_model_init(cmdline_lp_ctx);
 409
 410         shared_init = load_samba_modules(NULL, cmdline_lp_ctx, "service");
 411
 412         run_init_functions(static_init);
 413         run_init_functions(shared_init);
 414
 415         talloc_free(shared_init);
 416
 417         /* the event context is the top level structure in smbd. Everything else
 418            should hang off that */
 419         event_ctx = s4_event_context_init(talloc_autofree_context());
 420
 421         /* setup this as the default context */
 422         s4_event_context_set_default(event_ctx);
 423
 424         if (event_ctx == NULL) {
 425                 DEBUG(0,("Initializing event context failed\n"));
 426                 return 1;
 427         }
 428
 429         if (opt_interactive) {
 430                 /* terminate when stdin goes away */
 431                 stdin_event_flags = TEVENT_FD_READ;
 432         } else {
 433                 /* stay alive forever */
 434                 stdin_event_flags = 0;
 435         }
 436
 437         /* catch EOF on stdin */
 438 #ifdef SIGTTIN
 439         signal(SIGTTIN, SIG_IGN);
 440 #endif
 441         tevent_add_fd(event_ctx, event_ctx, 0, stdin_event_flags,
 442                       server_stdin_handler,
 443                       discard_const(binary_name));
 444
 445         if (max_runtime) {
 446                 tevent_add_timer(event_ctx, event_ctx,
 447                                  timeval_current_ofs(max_runtime, 0),
 448                                  max_runtime_handler,
 449                                  discard_const(binary_name));
 450         }
 451
 452         prime_ldb_databases(event_ctx);
 453
 454         status = setup_parent_messaging(event_ctx, cmdline_lp_ctx);
 455         if (!NT_STATUS_IS_OK(status)) {
 456                 DEBUG(0,("Failed to setup parent messaging - %s\n", nt_errstr(status)));
 457                 return 1;
 458         }
 459
 460         DEBUG(0,("%s: using '%s' process model\n", binary_name, model));
 461
 462         status = server_service_startup(event_ctx, cmdline_lp_ctx, model,
 463                                         lp_server_services(cmdline_lp_ctx));
 464         if (!NT_STATUS_IS_OK(status)) {
 465                 DEBUG(0,("Starting Services failed - %s\n", nt_errstr(status)));
 466                 return 1;
 467         }
 468
 469         /* wait for events - this is where smbd sits for most of its
 470            life */
 471         tevent_loop_wait(event_ctx);
 472
 473         /* as everything hangs off this event context, freeing it
 474            should initiate a clean shutdown of all services */
 475         talloc_free(event_ctx);
 476
 477         return 0;
 478 }
 479
 480 int main(int argc, const char *argv[])
 481 {
 482         return binary_smbd_main("samba", argc, argv);
 483 }