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(0);
 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         DEBUG(0,("%s: maximum runtime exceeded - terminating\n", binary_name));
 182         exit(0);
 183 }
 184
 185 /*
 186   pre-open the key databases. This saves a lot of time in child
 187   processes
 188  */
 189 static void prime_ldb_databases(struct tevent_context *event_ctx)
 190 {
 191         TALLOC_CTX *db_context;
 192         db_context = talloc_new(event_ctx);
 193
 194         samdb_connect(db_context, event_ctx, cmdline_lp_ctx, system_session(cmdline_lp_ctx));
 195         privilege_connect(db_context, event_ctx, cmdline_lp_ctx);
 196
 197         /* we deliberately leave these open, which allows them to be
 198          * re-used in ldb_wrap_connect() */
 199 }
 200
 201
 202 /*
 203   called when a fatal condition occurs in a child task
 204  */
 205 static NTSTATUS samba_terminate(struct irpc_message *msg,
 206                                 struct samba_terminate *r)
 207 {
 208         DEBUG(0,("samba_terminate: %s\n", r->in.reason));
 209         exit(1);
 210 }
 211
 212 /*
 213   setup messaging for the top level samba (parent) task
 214  */
 215 static NTSTATUS setup_parent_messaging(struct tevent_context *event_ctx,
 216                                        struct loadparm_context *lp_ctx)
 217 {
 218         struct messaging_context *msg;
 219         NTSTATUS status;
 220
 221         msg = messaging_init(talloc_autofree_context(),
 222                              lpcfg_messaging_path(event_ctx, lp_ctx),
 223                              cluster_id(0, SAMBA_PARENT_TASKID), event_ctx);
 224         NT_STATUS_HAVE_NO_MEMORY(msg);
 225
 226         irpc_add_name(msg, "samba");
 227
 228         status = IRPC_REGISTER(msg, irpc, SAMBA_TERMINATE,
 229                                samba_terminate, NULL);
 230
 231         return status;
 232 }
 233
 234
 235 /*
 236   show build info
 237  */
 238 static void show_build(void)
 239 {
 240 #define CONFIG_OPTION(n) { #n, dyn_ ## n }
 241         struct {
 242                 const char *name;
 243                 const char *value;
 244         } config_options[] = {
 245                 CONFIG_OPTION(BINDIR),
 246                 CONFIG_OPTION(SBINDIR),
 247                 CONFIG_OPTION(CONFIGFILE),
 248                 CONFIG_OPTION(NCALRPCDIR),
 249                 CONFIG_OPTION(LOGFILEBASE),
 250                 CONFIG_OPTION(LMHOSTSFILE),
 251                 CONFIG_OPTION(DATADIR),
 252                 CONFIG_OPTION(MODULESDIR),
 253                 CONFIG_OPTION(LOCKDIR),
 254                 CONFIG_OPTION(PIDDIR),
 255                 CONFIG_OPTION(PRIVATE_DIR),
 256                 CONFIG_OPTION(SWATDIR),
 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(lpcfg_lockdir(cmdline_lp_ctx))) {
 392                 mkdir(lpcfg_lockdir(cmdline_lp_ctx), 0755);
 393         }
 394
 395         pidfile_create(lpcfg_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         if (lpcfg_server_role(cmdline_lp_ctx) == ROLE_DOMAIN_CONTROLLER) {
 405                 if (!open_schannel_session_store(talloc_autofree_context(), lpcfg_private_dir(cmdline_lp_ctx))) {
 406                         DEBUG(0,("ERROR: Samba cannot open schannel store for secured NETLOGON operations.\n"));
 407                         exit(1);
 408                 }
 409         }
 410
 411         gensec_init(cmdline_lp_ctx); /* FIXME: */
 412
 413         ntptr_init(cmdline_lp_ctx);     /* FIXME: maybe run this in the initialization function
 414                                                 of the spoolss RPC server instead? */
 415
 416         ntvfs_init(cmdline_lp_ctx);     /* FIXME: maybe run this in the initialization functions
 417                                                 of the SMB[,2] server instead? */
 418
 419         process_model_init(cmdline_lp_ctx);
 420
 421         shared_init = load_samba_modules(NULL, cmdline_lp_ctx, "service");
 422
 423         run_init_functions(static_init);
 424         run_init_functions(shared_init);
 425
 426         talloc_free(shared_init);
 427
 428         /* the event context is the top level structure in smbd. Everything else
 429            should hang off that */
 430         event_ctx = s4_event_context_init(talloc_autofree_context());
 431
 432         /* setup this as the default context */
 433         s4_event_context_set_default(event_ctx);
 434
 435         if (event_ctx == NULL) {
 436                 DEBUG(0,("Initializing event context failed\n"));
 437                 return 1;
 438         }
 439
 440         if (opt_interactive) {
 441                 /* terminate when stdin goes away */
 442                 stdin_event_flags = TEVENT_FD_READ;
 443         } else {
 444                 /* stay alive forever */
 445                 stdin_event_flags = 0;
 446         }
 447
 448         /* catch EOF on stdin */
 449 #ifdef SIGTTIN
 450         signal(SIGTTIN, SIG_IGN);
 451 #endif
 452         tevent_add_fd(event_ctx, event_ctx, 0, stdin_event_flags,
 453                       server_stdin_handler,
 454                       discard_const(binary_name));
 455
 456         if (max_runtime) {
 457                 tevent_add_timer(event_ctx, event_ctx,
 458                                  timeval_current_ofs(max_runtime, 0),
 459                                  max_runtime_handler,
 460                                  discard_const(binary_name));
 461         }
 462
 463         prime_ldb_databases(event_ctx);
 464
 465         status = setup_parent_messaging(event_ctx, cmdline_lp_ctx);
 466         if (!NT_STATUS_IS_OK(status)) {
 467                 DEBUG(0,("Failed to setup parent messaging - %s\n", nt_errstr(status)));
 468                 return 1;
 469         }
 470
 471         DEBUG(0,("%s: using '%s' process model\n", binary_name, model));
 472
 473         status = server_service_startup(event_ctx, cmdline_lp_ctx, model,
 474                                         lpcfg_server_services(cmdline_lp_ctx));
 475         if (!NT_STATUS_IS_OK(status)) {
 476                 DEBUG(0,("Starting Services failed - %s\n", nt_errstr(status)));
 477                 return 1;
 478         }
 479
 480         /* wait for events - this is where smbd sits for most of its
 481            life */
 482         tevent_loop_wait(event_ctx);
 483
 484         /* as everything hangs off this event context, freeing it
 485            should initiate a clean shutdown of all services */
 486         talloc_free(event_ctx);
 487
 488         return 0;
 489 }
 490
 491 int main(int argc, const char *argv[])
 492 {
 493         return binary_smbd_main("samba", argc, argv);
 494 }