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/>.
26 #include "lib/events/events.h"
28 #include "lib/cmdline/popt_common.h"
29 #include "system/dir.h"
30 #include "system/filesys.h"
31 #include "auth/gensec/gensec.h"
32 #include "libcli/auth/schannel.h"
33 #include "smbd/process_model.h"
34 #include "param/secrets.h"
35 #include "lib/util/pidfile.h"
36 #include "param/param.h"
37 #include "dsdb/samdb/samdb.h"
38 #include "auth/session.h"
39 #include "lib/messaging/irpc.h"
40 #include "librpc/gen_ndr/ndr_irpc.h"
41 #include "cluster/cluster.h"
42 #include "dynconfig/dynconfig.h"
43 #include "lib/util/samba_modules.h"
44 #include "nsswitch/winbind_client.h"
45 #include "libds/common/roles.h"
48 recursively delete a directory tree
50 static void recursive_delete(const char *path)
60 for (de=readdir(dir);de;de=readdir(dir)) {
64 if (ISDOT(de->d_name) || ISDOTDOT(de->d_name)) {
68 fname = talloc_asprintf(path, "%s/%s", path, de->d_name);
69 if (stat(fname, &st) != 0) {
72 if (S_ISDIR(st.st_mode)) {
73 recursive_delete(fname);
77 if (unlink(fname) != 0) {
78 DEBUG(0,("Unabled to delete '%s' - %s\n",
79 fname, strerror(errno)));
80 smb_panic("unable to cleanup tmp files");
88 cleanup temporary files. This is the new alternative to
89 TDB_CLEAR_IF_FIRST. Unfortunately TDB_CLEAR_IF_FIRST is not
90 efficient on unix systems due to the lack of scaling of the byte
91 range locking system. So instead of putting the burden on tdb to
92 cleanup tmp files, this function deletes them.
94 static void cleanup_tmp_files(struct loadparm_context *lp_ctx)
97 TALLOC_CTX *mem_ctx = talloc_new(NULL);
99 path = smbd_tmp_path(mem_ctx, lp_ctx, NULL);
101 recursive_delete(path);
102 talloc_free(mem_ctx);
105 static void sig_hup(int sig)
107 debug_schedule_reopen_logs();
110 static void sig_term(int sig)
113 static int done_sigterm;
114 if (done_sigterm == 0 && getpgrp() == getpid()) {
115 DEBUG(0,("SIGTERM: killing children\n"));
117 kill(-getpgrp(), SIGTERM);
120 DEBUG(0,("Exiting pid %d on SIGTERM\n", (int)getpid()));
127 static void setup_signals(void)
129 /* we are never interested in SIGPIPE */
130 BlockSignals(true,SIGPIPE);
133 /* we are never interested in SIGFPE */
134 BlockSignals(true,SIGFPE);
137 /* We are no longer interested in USR1 */
138 BlockSignals(true, SIGUSR1);
141 /* We are no longer interested in USR2 */
142 BlockSignals(true,SIGUSR2);
145 /* POSIX demands that signals are inherited. If the invoking process has
146 * these signals masked, we will have problems, as we won't receive them. */
147 BlockSignals(false, SIGHUP);
148 BlockSignals(false, SIGTERM);
150 CatchSignal(SIGHUP, sig_hup);
151 CatchSignal(SIGTERM, sig_term);
157 static void server_stdin_handler(struct tevent_context *event_ctx, struct tevent_fd *fde,
158 uint16_t flags, void *private_data)
160 const char *binary_name = (const char *)private_data;
162 if (read(0, &c, 1) == 0) {
163 DEBUG(0,("%s: EOF on stdin - PID %d terminating\n", binary_name, (int)getpid()));
165 if (getpgrp() == getpid()) {
166 DEBUG(0,("Sending SIGTERM from pid %d\n", (int)getpid()));
167 kill(-getpgrp(), SIGTERM);
175 die if the user selected maximum runtime is exceeded
177 _NORETURN_ static void max_runtime_handler(struct tevent_context *ev,
178 struct tevent_timer *te,
179 struct timeval t, void *private_data)
181 const char *binary_name = (const char *)private_data;
182 DEBUG(0,("%s: maximum runtime exceeded - terminating PID %d at %llu, current ts: %llu\n",
183 binary_name, (int)getpid(), (unsigned long long)t.tv_sec, (unsigned long long) time(NULL)));
188 pre-open the key databases. This saves a lot of time in child
191 static void prime_ldb_databases(struct tevent_context *event_ctx)
193 TALLOC_CTX *db_context;
194 db_context = talloc_new(event_ctx);
196 samdb_connect(db_context, event_ctx, cmdline_lp_ctx, system_session(cmdline_lp_ctx), 0);
197 privilege_connect(db_context, cmdline_lp_ctx);
199 /* we deliberately leave these open, which allows them to be
200 * re-used in ldb_wrap_connect() */
205 called when a fatal condition occurs in a child task
207 static NTSTATUS samba_terminate(struct irpc_message *msg,
208 struct samba_terminate *r)
210 DEBUG(0,("samba_terminate of %d: %s\n",
211 (int)getpid(), r->in.reason));
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;
224 msg = imessaging_init(talloc_autofree_context(),
226 cluster_id(0, SAMBA_PARENT_TASKID), event_ctx);
227 NT_STATUS_HAVE_NO_MEMORY(msg);
229 status = irpc_add_name(msg, "samba");
230 if (!NT_STATUS_IS_OK(status)) {
234 status = IRPC_REGISTER(msg, irpc, SAMBA_TERMINATE,
235 samba_terminate, NULL);
244 static void show_build(void)
246 #define CONFIG_OPTION(n) { #n, dyn_ ## n }
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),
273 printf("Samba version: %s\n", SAMBA_VERSION_STRING);
274 printf("Build environment:\n");
276 printf(" Build host: %s\n", BUILD_SYSTEM);
280 for (i=0; config_options[i].name; i++) {
281 printf(" %s: %s\n", config_options[i].name, config_options[i].value);
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;
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;
303 const char *model = "standard";
312 struct poptOption long_options[] = {
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 },
328 pc = poptGetContext(binary_name, argc, argv, long_options, 0);
329 while((opt = poptGetNextOpt(pc)) != -1) {
334 case OPT_INTERACTIVE:
335 opt_interactive = true;
337 case OPT_PROCESS_MODEL:
338 model = poptGetOptArg(pc);
344 fprintf(stderr, "\nInvalid option %s: %s\n\n",
345 poptBadOption(pc, 0), poptStrerror(opt));
346 poptPrintUsage(pc, stderr, 0);
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);
356 } else if (!opt_interactive) {
357 /* default is --daemon */
363 talloc_enable_null_tracking();
365 setup_logging(binary_name, opt_interactive?DEBUG_STDOUT:DEBUG_FILE);
368 /* we want total control over the permissions on created files,
369 so set our umask to 0 */
372 DEBUG(0,("%s version %s started.\n", binary_name, SAMBA_VERSION_STRING));
373 DEBUGADD(0,("Copyright Andrew Tridgell and the Samba Team 1992-2016\n"));
375 if (sizeof(uint16_t) < 2 || sizeof(uint32_t) < 4 || sizeof(uint64_t) < 8) {
376 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
377 DEBUGADD(0,("sizeof(uint16_t) = %u, sizeof(uint32_t) %u, sizeof(uint64_t) = %u\n",
378 (unsigned int)sizeof(uint16_t), (unsigned int)sizeof(uint32_t), (unsigned int)sizeof(uint64_t)));
383 DEBUG(3,("Becoming a daemon.\n"));
384 become_daemon(true, false, false);
387 cleanup_tmp_files(cmdline_lp_ctx);
389 if (!directory_exist(lpcfg_lock_directory(cmdline_lp_ctx))) {
390 mkdir(lpcfg_lock_directory(cmdline_lp_ctx), 0755);
393 pidfile_create(lpcfg_pid_directory(cmdline_lp_ctx), binary_name);
395 if (lpcfg_server_role(cmdline_lp_ctx) == ROLE_ACTIVE_DIRECTORY_DC) {
396 if (!open_schannel_session_store(talloc_autofree_context(), cmdline_lp_ctx)) {
397 exit_daemon("Samba cannot open schannel store for secured NETLOGON operations.", EACCES);
401 /* make sure we won't go through nss_winbind */
402 if (!winbind_off()) {
403 exit_daemon("Samba failed to disable recusive winbindd calls.", EACCES);
406 gensec_init(); /* FIXME: */
408 process_model_init(cmdline_lp_ctx);
410 shared_init = load_samba_modules(NULL, "service");
412 run_init_functions(static_init);
413 run_init_functions(shared_init);
415 talloc_free(shared_init);
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());
421 if (event_ctx == NULL) {
422 exit_daemon("Initializing event context failed", EACCES);
425 if (opt_interactive) {
426 /* terminate when stdin goes away */
427 stdin_event_flags = TEVENT_FD_READ;
429 /* stay alive forever */
430 stdin_event_flags = 0;
433 /* catch EOF on stdin */
435 signal(SIGTTIN, SIG_IGN);
438 if (fstat(0, &st) != 0) {
439 exit_daemon("Samba failed to set standard input handler", ENOTTY);
442 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode)) {
443 tevent_add_fd(event_ctx,
447 server_stdin_handler,
448 discard_const(binary_name));
452 DEBUG(0,("%s PID %d was called with maxruntime %d - current ts %llu\n",
453 binary_name, (int)getpid(),
454 max_runtime, (unsigned long long) time(NULL)));
455 tevent_add_timer(event_ctx, event_ctx,
456 timeval_current_ofs(max_runtime, 0),
458 discard_const(binary_name));
461 if (lpcfg_server_role(cmdline_lp_ctx) != ROLE_ACTIVE_DIRECTORY_DC
462 && !lpcfg_parm_bool(cmdline_lp_ctx, NULL, "server role check", "inhibit", false)
463 && !str_list_check_ci(lpcfg_server_services(cmdline_lp_ctx), "smb")
464 && !str_list_check_ci(lpcfg_dcerpc_endpoint_servers(cmdline_lp_ctx), "remote")
465 && !str_list_check_ci(lpcfg_dcerpc_endpoint_servers(cmdline_lp_ctx), "mapiproxy")) {
466 DEBUG(0, ("At this time the 'samba' binary should only be used for either:\n"));
467 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"));
468 DEBUGADD(0, ("You should start smbd/nmbd/winbindd instead for domain member and standalone file server tasks\n"));
469 exit_daemon("Samba detected misconfigured 'server role' and exited. Check logs for details", EINVAL);
472 prime_ldb_databases(event_ctx);
474 status = setup_parent_messaging(event_ctx, cmdline_lp_ctx);
475 if (!NT_STATUS_IS_OK(status)) {
476 exit_daemon("Samba failed to setup parent messaging", NT_STATUS_V(status));
479 DEBUG(0,("%s: using '%s' process model\n", binary_name, model));
481 status = server_service_startup(event_ctx, cmdline_lp_ctx, model,
482 lpcfg_server_services(cmdline_lp_ctx));
483 if (!NT_STATUS_IS_OK(status)) {
484 exit_daemon("Samba failed to start services", NT_STATUS_V(status));
488 daemon_ready("samba");
491 /* wait for events - this is where smbd sits for most of its
493 tevent_loop_wait(event_ctx);
495 /* as everything hangs off this event context, freeing it
496 should initiate a clean shutdown of all services */
497 talloc_free(event_ctx);
502 int main(int argc, const char *argv[])
504 return binary_smbd_main("samba", argc, argv);