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         DEBUG(0,("%s: maximum runtime exceeded - terminating, current ts: %d\n", binary_name, time(NULL)));
 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), 0);
 195         privilege_connect(db_context, 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 imessaging_context *msg;
 219         NTSTATUS status;
 220
 221         msg = imessaging_init(talloc_autofree_context(),
 222                              lpcfg_imessaging_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(CODEPAGEDIR),
 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("Samba version: %s\n", SAMBA_VERSION_STRING);
 267         printf("Build environment:\n");
 268 #ifdef BUILD_SYSTEM
 269         printf("   Build host:  %s\n", BUILD_SYSTEM);
 270 #endif
 271
 272         printf("Paths:\n");
 273         for (i=0; config_options[i].name; i++) {
 274                 printf("   %s: %s\n", config_options[i].name, config_options[i].value);
 275         }
 276
 277         exit(0);
 278 }
 279
 280 /*
 281  main server.
 282 */
 283 static int binary_smbd_main(const char *binary_name, int argc, const char *argv[])
 284 {
 285         bool opt_daemon = false;
 286         bool opt_interactive = false;
 287         int opt;
 288         poptContext pc;
 289 #define _MODULE_PROTO(init) extern NTSTATUS init(void);
 290         STATIC_service_MODULES_PROTO;
 291         init_module_fn static_init[] = { STATIC_service_MODULES };
 292         init_module_fn *shared_init;
 293         struct tevent_context *event_ctx;
 294         uint16_t stdin_event_flags;
 295         NTSTATUS status;
 296         const char *model = "standard";
 297         int max_runtime = 0;
 298         enum {
 299                 OPT_DAEMON = 1000,
 300                 OPT_INTERACTIVE,
 301                 OPT_PROCESS_MODEL,
 302                 OPT_SHOW_BUILD
 303         };
 304         struct poptOption long_options[] = {
 305                 POPT_AUTOHELP
 306                 {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON,
 307                  "Become a daemon (default)", NULL },
 308                 {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE,
 309                  "Run interactive (not a daemon)", NULL},
 310                 {"model", 'M', POPT_ARG_STRING, NULL, OPT_PROCESS_MODEL,
 311                  "Select process model", "MODEL"},
 312                 {"maximum-runtime",0, POPT_ARG_INT, &max_runtime, 0,
 313                  "set maximum runtime of the server process, till autotermination", "seconds"},
 314                 {"show-build", 'b', POPT_ARG_NONE, NULL, OPT_SHOW_BUILD, "show build info", NULL },
 315                 POPT_COMMON_SAMBA
 316                 POPT_COMMON_VERSION
 317                 { NULL }
 318         };
 319
 320         pc = poptGetContext(binary_name, argc, argv, long_options, 0);
 321         while((opt = poptGetNextOpt(pc)) != -1) {
 322                 switch(opt) {
 323                 case OPT_DAEMON:
 324                         opt_daemon = true;
 325                         break;
 326                 case OPT_INTERACTIVE:
 327                         opt_interactive = true;
 328                         break;
 329                 case OPT_PROCESS_MODEL:
 330                         model = poptGetOptArg(pc);
 331                         break;
 332                 case OPT_SHOW_BUILD:
 333                         show_build();
 334                         break;
 335                 default:
 336                         fprintf(stderr, "\nInvalid option %s: %s\n\n",
 337                                   poptBadOption(pc, 0), poptStrerror(opt));
 338                         poptPrintUsage(pc, stderr, 0);
 339                         return 1;
 340                 }
 341         }
 342
 343         if (opt_daemon && opt_interactive) {
 344                 fprintf(stderr,"\nERROR: "
 345                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
 346                 poptPrintUsage(pc, stderr, 0);
 347                 return 1;
 348         } else if (!opt_interactive) {
 349                 /* default is --daemon */
 350                 opt_daemon = true;
 351         }
 352
 353         poptFreeContext(pc);
 354
 355         setup_logging(binary_name, opt_interactive?DEBUG_STDOUT:DEBUG_FILE);
 356         setup_signals();
 357
 358         /* we want total control over the permissions on created files,
 359            so set our umask to 0 */
 360         umask(0);
 361
 362         DEBUG(0,("%s version %s started.\n", binary_name, SAMBA_VERSION_STRING));
 363         DEBUGADD(0,("Copyright Andrew Tridgell and the Samba Team 1992-2011\n"));
 364
 365         if (sizeof(uint16_t) < 2 || sizeof(uint32_t) < 4 || sizeof(uint64_t) < 8) {
 366                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
 367                 DEBUGADD(0,("sizeof(uint16_t) = %u, sizeof(uint32_t) %u, sizeof(uint64_t) = %u\n",
 368                             (unsigned int)sizeof(uint16_t), (unsigned int)sizeof(uint32_t), (unsigned int)sizeof(uint64_t)));
 369                 return 1;
 370         }
 371
 372         if (opt_daemon) {
 373                 DEBUG(3,("Becoming a daemon.\n"));
 374                 become_daemon(true, false, false);
 375         }
 376
 377         cleanup_tmp_files(cmdline_lp_ctx);
 378
 379         if (!directory_exist(lpcfg_lockdir(cmdline_lp_ctx))) {
 380                 mkdir(lpcfg_lockdir(cmdline_lp_ctx), 0755);
 381         }
 382
 383         pidfile_create(lpcfg_piddir(cmdline_lp_ctx), binary_name);
 384
 385         /* Set up a database to hold a random seed, in case we don't
 386          * have /dev/urandom */
 387         if (!randseed_init(talloc_autofree_context(), cmdline_lp_ctx)) {
 388                 return 1;
 389         }
 390
 391         if (lpcfg_server_role(cmdline_lp_ctx) == ROLE_DOMAIN_CONTROLLER) {
 392                 if (!open_schannel_session_store(talloc_autofree_context(), lpcfg_private_dir(cmdline_lp_ctx))) {
 393                         DEBUG(0,("ERROR: Samba cannot open schannel store for secured NETLOGON operations.\n"));
 394                         exit(1);
 395                 }
 396         }
 397
 398         gensec_init(); /* FIXME: */
 399
 400         ntptr_init();   /* FIXME: maybe run this in the initialization function
 401                                                 of the spoolss RPC server instead? */
 402
 403         ntvfs_init(cmdline_lp_ctx);     /* FIXME: maybe run this in the initialization functions
 404                                                 of the SMB[,2] server instead? */
 405
 406         process_model_init(cmdline_lp_ctx);
 407
 408         shared_init = load_samba_modules(NULL, "service");
 409
 410         run_init_functions(static_init);
 411         run_init_functions(shared_init);
 412
 413         talloc_free(shared_init);
 414
 415         /* the event context is the top level structure in smbd. Everything else
 416            should hang off that */
 417         event_ctx = s4_event_context_init(talloc_autofree_context());
 418
 419         if (event_ctx == NULL) {
 420                 DEBUG(0,("Initializing event context failed\n"));
 421                 return 1;
 422         }
 423
 424         if (opt_interactive) {
 425                 /* terminate when stdin goes away */
 426                 stdin_event_flags = TEVENT_FD_READ;
 427         } else {
 428                 /* stay alive forever */
 429                 stdin_event_flags = 0;
 430         }
 431
 432         /* catch EOF on stdin */
 433 #ifdef SIGTTIN
 434         signal(SIGTTIN, SIG_IGN);
 435 #endif
 436         tevent_add_fd(event_ctx, event_ctx, 0, stdin_event_flags,
 437                       server_stdin_handler,
 438                       discard_const(binary_name));
 439
 440         if (max_runtime) {
 441                 DEBUG(0,("Called with maxruntime %d - current ts %d\n", max_runtime, time(NULL)));
 442                 tevent_add_timer(event_ctx, event_ctx,
 443                                  timeval_current_ofs(max_runtime, 0),
 444                                  max_runtime_handler,
 445                                  discard_const(binary_name));
 446         }
 447
 448         prime_ldb_databases(event_ctx);
 449
 450         status = setup_parent_messaging(event_ctx, cmdline_lp_ctx);
 451         if (!NT_STATUS_IS_OK(status)) {
 452                 DEBUG(0,("Failed to setup parent messaging - %s\n", nt_errstr(status)));
 453                 return 1;
 454         }
 455
 456         DEBUG(0,("%s: using '%s' process model\n", binary_name, model));
 457
 458         status = server_service_startup(event_ctx, cmdline_lp_ctx, model,
 459                                         lpcfg_server_services(cmdline_lp_ctx));
 460         if (!NT_STATUS_IS_OK(status)) {
 461                 DEBUG(0,("Starting Services failed - %s\n", nt_errstr(status)));
 462                 return 1;
 463         }
 464
 465         /* wait for events - this is where smbd sits for most of its
 466            life */
 467         tevent_loop_wait(event_ctx);
 468
 469         /* as everything hangs off this event context, freeing it
 470            should initiate a clean shutdown of all services */
 471         talloc_free(event_ctx);
 472
 473         return 0;
 474 }
 475
 476 int main(int argc, const char *argv[])
 477 {
 478         return binary_smbd_main("samba", argc, argv);
 479 }