talloc: Add a warning to talloc_reference() documentation.
[Samba.git] / source4 / smbd / server.c
blobd5d9d9c1202bb858bebd14613402b7805f785737
1 /*
2 Unix SMB/CIFS implementation.
4 Main SMB server routines
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>
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.
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.
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/>.
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 "lib/util/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 #include "lib/util/samba_modules.h"
46 #include "nsswitch/winbind_client.h"
49 recursively delete a directory tree
51 static void recursive_delete(const char *path)
53 DIR *dir;
54 struct dirent *de;
56 dir = opendir(path);
57 if (!dir) {
58 return;
61 for (de=readdir(dir);de;de=readdir(dir)) {
62 char *fname;
63 struct stat st;
65 if (ISDOT(de->d_name) || ISDOTDOT(de->d_name)) {
66 continue;
69 fname = talloc_asprintf(path, "%s/%s", path, de->d_name);
70 if (stat(fname, &st) != 0) {
71 continue;
73 if (S_ISDIR(st.st_mode)) {
74 recursive_delete(fname);
75 talloc_free(fname);
76 continue;
78 if (unlink(fname) != 0) {
79 DEBUG(0,("Unabled to delete '%s' - %s\n",
80 fname, strerror(errno)));
81 smb_panic("unable to cleanup tmp files");
83 talloc_free(fname);
85 closedir(dir);
89 cleanup temporary files. This is the new alternative to
90 TDB_CLEAR_IF_FIRST. Unfortunately TDB_CLEAR_IF_FIRST is not
91 efficient on unix systems due to the lack of scaling of the byte
92 range locking system. So instead of putting the burden on tdb to
93 cleanup tmp files, this function deletes them.
95 static void cleanup_tmp_files(struct loadparm_context *lp_ctx)
97 char *path;
98 TALLOC_CTX *mem_ctx = talloc_new(NULL);
100 path = smbd_tmp_path(mem_ctx, lp_ctx, NULL);
102 recursive_delete(path);
103 talloc_free(mem_ctx);
106 static void sig_hup(int sig)
108 debug_schedule_reopen_logs();
111 static void sig_term(int sig)
113 #if HAVE_GETPGRP
114 static int done_sigterm;
115 if (done_sigterm == 0 && getpgrp() == getpid()) {
116 DEBUG(0,("SIGTERM: killing children\n"));
117 done_sigterm = 1;
118 kill(-getpgrp(), SIGTERM);
120 #endif
121 DEBUG(0,("Exiting pid %d on SIGTERM\n", (int)getpid()));
122 exit(127);
126 setup signal masks
128 static void setup_signals(void)
130 /* we are never interested in SIGPIPE */
131 BlockSignals(true,SIGPIPE);
133 #if defined(SIGFPE)
134 /* we are never interested in SIGFPE */
135 BlockSignals(true,SIGFPE);
136 #endif
138 /* We are no longer interested in USR1 */
139 BlockSignals(true, SIGUSR1);
141 #if defined(SIGUSR2)
142 /* We are no longer interested in USR2 */
143 BlockSignals(true,SIGUSR2);
144 #endif
146 /* POSIX demands that signals are inherited. If the invoking process has
147 * these signals masked, we will have problems, as we won't receive them. */
148 BlockSignals(false, SIGHUP);
149 BlockSignals(false, SIGTERM);
151 CatchSignal(SIGHUP, sig_hup);
152 CatchSignal(SIGTERM, sig_term);
156 handle io on stdin
158 static void server_stdin_handler(struct tevent_context *event_ctx, struct tevent_fd *fde,
159 uint16_t flags, void *private_data)
161 const char *binary_name = (const char *)private_data;
162 uint8_t c;
163 if (read(0, &c, 1) == 0) {
164 DEBUG(0,("%s: EOF on stdin - terminating\n", binary_name));
165 #if HAVE_GETPGRP
166 if (getpgrp() == getpid()) {
167 DEBUG(0,("Sending SIGTERM from pid %d\n", (int)getpid()));
168 kill(-getpgrp(), SIGTERM);
170 #endif
171 exit(0);
176 die if the user selected maximum runtime is exceeded
178 _NORETURN_ static void max_runtime_handler(struct tevent_context *ev,
179 struct tevent_timer *te,
180 struct timeval t, void *private_data)
182 const char *binary_name = (const char *)private_data;
183 DEBUG(0,("%s: maximum runtime exceeded - terminating at %llu, current ts: %llu\n",
184 binary_name, (unsigned long long)t.tv_sec, (unsigned long long) time(NULL)));
185 exit(0);
189 pre-open the key databases. This saves a lot of time in child
190 processes
192 static void prime_ldb_databases(struct tevent_context *event_ctx)
194 TALLOC_CTX *db_context;
195 db_context = talloc_new(event_ctx);
197 samdb_connect(db_context, event_ctx, cmdline_lp_ctx, system_session(cmdline_lp_ctx), 0);
198 privilege_connect(db_context, cmdline_lp_ctx);
200 /* we deliberately leave these open, which allows them to be
201 * re-used in ldb_wrap_connect() */
206 called when a fatal condition occurs in a child task
208 static NTSTATUS samba_terminate(struct irpc_message *msg,
209 struct samba_terminate *r)
211 DEBUG(0,("samba_terminate: %s\n", r->in.reason));
212 exit(1);
216 setup messaging for the top level samba (parent) task
218 static NTSTATUS setup_parent_messaging(struct tevent_context *event_ctx,
219 struct loadparm_context *lp_ctx)
221 struct imessaging_context *msg;
222 NTSTATUS status;
224 msg = imessaging_init(talloc_autofree_context(),
225 lp_ctx,
226 cluster_id(0, SAMBA_PARENT_TASKID), event_ctx, false);
227 NT_STATUS_HAVE_NO_MEMORY(msg);
229 status = irpc_add_name(msg, "samba");
230 if (!NT_STATUS_IS_OK(status)) {
231 return status;
234 status = IRPC_REGISTER(msg, irpc, SAMBA_TERMINATE,
235 samba_terminate, NULL);
237 return status;
242 show build info
244 static void show_build(void)
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(STATEDIR),
261 CONFIG_OPTION(CACHEDIR),
262 CONFIG_OPTION(PIDDIR),
263 CONFIG_OPTION(PRIVATE_DIR),
264 CONFIG_OPTION(CODEPAGEDIR),
265 CONFIG_OPTION(SETUPDIR),
266 CONFIG_OPTION(WINBINDD_SOCKET_DIR),
267 CONFIG_OPTION(WINBINDD_PRIVILEGED_SOCKET_DIR),
268 CONFIG_OPTION(NTP_SIGND_SOCKET_DIR),
269 { NULL, NULL}
271 int i;
273 printf("Samba version: %s\n", SAMBA_VERSION_STRING);
274 printf("Build environment:\n");
275 #ifdef BUILD_SYSTEM
276 printf(" Build host: %s\n", BUILD_SYSTEM);
277 #endif
279 printf("Paths:\n");
280 for (i=0; config_options[i].name; i++) {
281 printf(" %s: %s\n", config_options[i].name, config_options[i].value);
284 exit(0);
288 main server.
290 static int binary_smbd_main(const char *binary_name, int argc, const char *argv[])
292 bool opt_daemon = false;
293 bool opt_interactive = false;
294 int opt;
295 poptContext pc;
296 #define _MODULE_PROTO(init) extern NTSTATUS init(void);
297 STATIC_service_MODULES_PROTO;
298 init_module_fn static_init[] = { STATIC_service_MODULES };
299 init_module_fn *shared_init;
300 struct tevent_context *event_ctx;
301 uint16_t stdin_event_flags;
302 NTSTATUS status;
303 const char *model = "standard";
304 int max_runtime = 0;
305 struct stat st;
306 enum {
307 OPT_DAEMON = 1000,
308 OPT_INTERACTIVE,
309 OPT_PROCESS_MODEL,
310 OPT_SHOW_BUILD
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 }
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;
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;
361 poptFreeContext(pc);
363 setup_logging(binary_name, opt_interactive?DEBUG_STDOUT:DEBUG_FILE);
364 setup_signals();
366 /* we want total control over the permissions on created files,
367 so set our umask to 0 */
368 umask(0);
370 DEBUG(0,("%s version %s started.\n", binary_name, SAMBA_VERSION_STRING));
371 DEBUGADD(0,("Copyright Andrew Tridgell and the Samba Team 1992-2013\n"));
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;
380 if (opt_daemon) {
381 DEBUG(3,("Becoming a daemon.\n"));
382 become_daemon(true, false, false);
385 cleanup_tmp_files(cmdline_lp_ctx);
387 if (!directory_exist(lpcfg_lockdir(cmdline_lp_ctx))) {
388 mkdir(lpcfg_lockdir(cmdline_lp_ctx), 0755);
391 pidfile_create(lpcfg_piddir(cmdline_lp_ctx), binary_name);
393 /* Set up a database to hold a random seed, in case we don't
394 * have /dev/urandom */
395 if (!randseed_init(talloc_autofree_context(), cmdline_lp_ctx)) {
396 return 1;
399 if (lpcfg_server_role(cmdline_lp_ctx) == ROLE_ACTIVE_DIRECTORY_DC) {
400 if (!open_schannel_session_store(talloc_autofree_context(), cmdline_lp_ctx)) {
401 exit_daemon("Samba cannot open schannel store for secured NETLOGON operations.", EACCES);
405 /* make sure we won't go through nss_winbind */
406 if (!winbind_off()) {
407 exit_daemon("Samba failed to disable recusive winbindd calls.", EACCES);
410 gensec_init(); /* FIXME: */
412 ntptr_init(); /* FIXME: maybe run this in the initialization function
413 of the spoolss RPC server instead? */
415 ntvfs_init(cmdline_lp_ctx); /* FIXME: maybe run this in the initialization functions
416 of the SMB[,2] server instead? */
418 process_model_init(cmdline_lp_ctx);
420 shared_init = load_samba_modules(NULL, "service");
422 run_init_functions(static_init);
423 run_init_functions(shared_init);
425 talloc_free(shared_init);
427 /* the event context is the top level structure in smbd. Everything else
428 should hang off that */
429 event_ctx = s4_event_context_init(talloc_autofree_context());
431 if (event_ctx == NULL) {
432 exit_daemon("Initializing event context failed", EACCES);
435 if (opt_interactive) {
436 /* terminate when stdin goes away */
437 stdin_event_flags = TEVENT_FD_READ;
438 } else {
439 /* stay alive forever */
440 stdin_event_flags = 0;
443 /* catch EOF on stdin */
444 #ifdef SIGTTIN
445 signal(SIGTTIN, SIG_IGN);
446 #endif
448 if (fstat(0, &st) != 0) {
449 exit_daemon("Samba failed to set standard input handler", ENOTTY);
452 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode)) {
453 tevent_add_fd(event_ctx,
454 event_ctx,
456 stdin_event_flags,
457 server_stdin_handler,
458 discard_const(binary_name));
461 if (max_runtime) {
462 DEBUG(0,("Called with maxruntime %d - current ts %llu\n",
463 max_runtime, (unsigned long long) time(NULL)));
464 tevent_add_timer(event_ctx, event_ctx,
465 timeval_current_ofs(max_runtime, 0),
466 max_runtime_handler,
467 discard_const(binary_name));
470 if (lpcfg_server_role(cmdline_lp_ctx) != ROLE_ACTIVE_DIRECTORY_DC
471 && !lpcfg_parm_bool(cmdline_lp_ctx, NULL, "server role check", "inhibit", false)
472 && !str_list_check_ci(lpcfg_server_services(cmdline_lp_ctx), "smb")
473 && !str_list_check_ci(lpcfg_dcerpc_endpoint_servers(cmdline_lp_ctx), "remote")
474 && !str_list_check_ci(lpcfg_dcerpc_endpoint_servers(cmdline_lp_ctx), "mapiproxy")) {
475 DEBUG(0, ("At this time the 'samba' binary should only be used for either:\n"));
476 DEBUGADD(0, ("'server role = active directory domain controller' or to access the ntvfs file server with 'server services = +smb' or the rpc proxy with 'dcerpc endpoint servers = remote'\n"));
477 DEBUGADD(0, ("You should start smbd/nmbd/winbindd instead for domain member and standalone file server tasks\n"));
478 exit_daemon("Samba detected misconfigured 'server role' and exited. Check logs for details", EINVAL);
481 prime_ldb_databases(event_ctx);
483 status = setup_parent_messaging(event_ctx, cmdline_lp_ctx);
484 if (!NT_STATUS_IS_OK(status)) {
485 exit_daemon("Samba failed to setup parent messaging", NT_STATUS_V(status));
488 DEBUG(0,("%s: using '%s' process model\n", binary_name, model));
490 status = server_service_startup(event_ctx, cmdline_lp_ctx, model,
491 lpcfg_server_services(cmdline_lp_ctx));
492 if (!NT_STATUS_IS_OK(status)) {
493 exit_daemon("Samba failed to start services", NT_STATUS_V(status));
496 if (opt_daemon) {
497 daemon_ready("samba");
500 /* wait for events - this is where smbd sits for most of its
501 life */
502 tevent_loop_wait(event_ctx);
504 /* as everything hangs off this event context, freeing it
505 should initiate a clean shutdown of all services */
506 talloc_free(event_ctx);
508 return 0;
511 int main(int argc, const char *argv[])
513 return binary_smbd_main("samba", argc, argv);