summaryrefslogtreecommitdiff
path: root/source4/smbd/server.c
blob: 86622c8be976c7834f7bd93b58971a29889ad29c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
/* 
   Unix SMB/CIFS implementation.

   Main SMB server routines

   Copyright (C) Andrew Tridgell		1992-2005
   Copyright (C) Martin Pool			2002
   Copyright (C) Jelmer Vernooij		2002
   Copyright (C) James J Myers 			2003 <myersjj@samba.org>
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "lib/events/events.h"
#include "version.h"
#include "lib/cmdline/popt_common.h"
#include "system/dir.h"
#include "system/filesys.h"
#include "ntvfs/ntvfs.h"
#include "ntptr/ntptr.h"
#include "auth/gensec/gensec.h"
#include "libcli/auth/schannel.h"
#include "smbd/process_model.h"
#include "param/secrets.h"
#include "smbd/pidfile.h"
#include "param/param.h"
#include "dsdb/samdb/samdb.h"
#include "auth/session.h"
#include "lib/messaging/irpc.h"
#include "librpc/gen_ndr/ndr_irpc.h"
#include "cluster/cluster.h"
#include "dynconfig/dynconfig.h"
#include "lib/util/samba_modules.h"

/*
  recursively delete a directory tree
*/
static void recursive_delete(const char *path)
{
	DIR *dir;
	struct dirent *de;

	dir = opendir(path);
	if (!dir) {
		return;
	}

	for (de=readdir(dir);de;de=readdir(dir)) {
		char *fname;
		struct stat st;

		if (ISDOT(de->d_name) || ISDOTDOT(de->d_name)) {
			continue;
		}

		fname = talloc_asprintf(path, "%s/%s", path, de->d_name);
		if (stat(fname, &st) != 0) {
			continue;
		}
		if (S_ISDIR(st.st_mode)) {
			recursive_delete(fname);
			talloc_free(fname);
			continue;
		}
		if (unlink(fname) != 0) {
			DEBUG(0,("Unabled to delete '%s' - %s\n", 
				 fname, strerror(errno)));
			smb_panic("unable to cleanup tmp files");
		}
		talloc_free(fname);
	}
	closedir(dir);
}

/*
  cleanup temporary files. This is the new alternative to
  TDB_CLEAR_IF_FIRST. Unfortunately TDB_CLEAR_IF_FIRST is not
  efficient on unix systems due to the lack of scaling of the byte
  range locking system. So instead of putting the burden on tdb to
  cleanup tmp files, this function deletes them. 
*/
static void cleanup_tmp_files(struct loadparm_context *lp_ctx)
{
	char *path;
	TALLOC_CTX *mem_ctx = talloc_new(NULL);

	path = smbd_tmp_path(mem_ctx, lp_ctx, NULL);

	recursive_delete(path);
	talloc_free(mem_ctx);
}

static void sig_hup(int sig)
{
	debug_schedule_reopen_logs();
}

static void sig_term(int sig)
{
#if HAVE_GETPGRP
	static int done_sigterm;
	if (done_sigterm == 0 && getpgrp() == getpid()) {
		DEBUG(0,("SIGTERM: killing children\n"));
		done_sigterm = 1;
		kill(-getpgrp(), SIGTERM);
	}
#endif
	DEBUG(0,("Exiting pid %d on SIGTERM\n", (int)getpid()));
	exit(127);
}

/*
  setup signal masks
*/
static void setup_signals(void)
{
	/* we are never interested in SIGPIPE */
	BlockSignals(true,SIGPIPE);

#if defined(SIGFPE)
	/* we are never interested in SIGFPE */
	BlockSignals(true,SIGFPE);
#endif

	/* We are no longer interested in USR1 */
	BlockSignals(true, SIGUSR1);

#if defined(SIGUSR2)
	/* We are no longer interested in USR2 */
	BlockSignals(true,SIGUSR2);
#endif

	/* POSIX demands that signals are inherited. If the invoking process has
	 * these signals masked, we will have problems, as we won't receive them. */
	BlockSignals(false, SIGHUP);
	BlockSignals(false, SIGTERM);

	CatchSignal(SIGHUP, sig_hup);
	CatchSignal(SIGTERM, sig_term);
}

/*
  handle io on stdin
*/
static void server_stdin_handler(struct tevent_context *event_ctx, struct tevent_fd *fde, 
				 uint16_t flags, void *private_data)
{
	const char *binary_name = (const char *)private_data;
	uint8_t c;
	if (read(0, &c, 1) == 0) {
		DEBUG(0,("%s: EOF on stdin - terminating\n", binary_name));
#if HAVE_GETPGRP
		if (getpgrp() == getpid()) {
			DEBUG(0,("Sending SIGTERM from pid %d\n", (int)getpid()));
			kill(-getpgrp(), SIGTERM);
		}
#endif
		exit(0);
	}
}

/*
  die if the user selected maximum runtime is exceeded
*/
_NORETURN_ static void max_runtime_handler(struct tevent_context *ev, 
					   struct tevent_timer *te, 
					   struct timeval t, void *private_data)
{
	const char *binary_name = (const char *)private_data;
	DEBUG(0,("%s: maximum runtime exceeded - terminating, current ts: %llu\n",
	      binary_name, (unsigned long long) time(NULL)));
	exit(0);
}

/*
  pre-open the key databases. This saves a lot of time in child
  processes
 */
static void prime_ldb_databases(struct tevent_context *event_ctx)
{
	TALLOC_CTX *db_context;
	db_context = talloc_new(event_ctx);

	samdb_connect(db_context, event_ctx, cmdline_lp_ctx, system_session(cmdline_lp_ctx), 0);
	privilege_connect(db_context, cmdline_lp_ctx);

	/* we deliberately leave these open, which allows them to be
	 * re-used in ldb_wrap_connect() */
}


/*
  called when a fatal condition occurs in a child task
 */
static NTSTATUS samba_terminate(struct irpc_message *msg, 
				struct samba_terminate *r)
{
	DEBUG(0,("samba_terminate: %s\n", r->in.reason));
	exit(1);
}

/*
  setup messaging for the top level samba (parent) task
 */
static NTSTATUS setup_parent_messaging(struct tevent_context *event_ctx, 
				       struct loadparm_context *lp_ctx)
{
	struct imessaging_context *msg;
	NTSTATUS status;

	msg = imessaging_init(talloc_autofree_context(),
			      lp_ctx,
			      cluster_id(0, SAMBA_PARENT_TASKID), event_ctx, false);
	NT_STATUS_HAVE_NO_MEMORY(msg);

	irpc_add_name(msg, "samba");

	status = IRPC_REGISTER(msg, irpc, SAMBA_TERMINATE,
			       samba_terminate, NULL);

	return status;
}


/*
  show build info
 */
static void show_build(void)
{
#define CONFIG_OPTION(n) { #n, dyn_ ## n }
	struct {
		const char *name;
		const char *value;
	} config_options[] = {
		CONFIG_OPTION(BINDIR),
		CONFIG_OPTION(SBINDIR),
		CONFIG_OPTION(CONFIGFILE),
		CONFIG_OPTION(NCALRPCDIR),
		CONFIG_OPTION(LOGFILEBASE),
		CONFIG_OPTION(LMHOSTSFILE),
		CONFIG_OPTION(DATADIR),
		CONFIG_OPTION(MODULESDIR),
		CONFIG_OPTION(LOCKDIR),
		CONFIG_OPTION(STATEDIR),
		CONFIG_OPTION(CACHEDIR),
		CONFIG_OPTION(PIDDIR),
		CONFIG_OPTION(PRIVATE_DIR),
		CONFIG_OPTION(SWATDIR),
		CONFIG_OPTION(CODEPAGEDIR),
		CONFIG_OPTION(SETUPDIR),
		CONFIG_OPTION(WINBINDD_SOCKET_DIR),
		CONFIG_OPTION(WINBINDD_PRIVILEGED_SOCKET_DIR),
		CONFIG_OPTION(NTP_SIGND_SOCKET_DIR),
		{ NULL, NULL}
	};
	int i;

	printf("Samba version: %s\n", SAMBA_VERSION_STRING);
	printf("Build environment:\n");
#ifdef BUILD_SYSTEM
	printf("   Build host:  %s\n", BUILD_SYSTEM);
#endif

	printf("Paths:\n");
	for (i=0; config_options[i].name; i++) {
		printf("   %s: %s\n", config_options[i].name, config_options[i].value);
	}

	exit(0);
}

/*
 main server.
*/
static int binary_smbd_main(const char *binary_name, int argc, const char *argv[])
{
	bool opt_daemon = false;
	bool opt_interactive = false;
	int opt;
	poptContext pc;
#define _MODULE_PROTO(init) extern NTSTATUS init(void);
	STATIC_service_MODULES_PROTO;
	init_module_fn static_init[] = { STATIC_service_MODULES };
	init_module_fn *shared_init;
	struct tevent_context *event_ctx;
	uint16_t stdin_event_flags;
	NTSTATUS status;
	const char *model = "standard";
	int max_runtime = 0;
	enum {
		OPT_DAEMON = 1000,
		OPT_INTERACTIVE,
		OPT_PROCESS_MODEL,
		OPT_SHOW_BUILD
	};
	struct poptOption long_options[] = {
		POPT_AUTOHELP
		{"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON,
		 "Become a daemon (default)", NULL },
		{"interactive",	'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE,
		 "Run interactive (not a daemon)", NULL},
		{"model", 'M', POPT_ARG_STRING,	NULL, OPT_PROCESS_MODEL, 
		 "Select process model", "MODEL"},
		{"maximum-runtime",0, POPT_ARG_INT, &max_runtime, 0, 
		 "set maximum runtime of the server process, till autotermination", "seconds"},
		{"show-build", 'b', POPT_ARG_NONE, NULL, OPT_SHOW_BUILD, "show build info", NULL },
		POPT_COMMON_SAMBA
		POPT_COMMON_VERSION
		{ NULL }
	};

	pc = poptGetContext(binary_name, argc, argv, long_options, 0);
	while((opt = poptGetNextOpt(pc)) != -1) {
		switch(opt) {
		case OPT_DAEMON:
			opt_daemon = true;
			break;
		case OPT_INTERACTIVE:
			opt_interactive = true;
			break;
		case OPT_PROCESS_MODEL:
			model = poptGetOptArg(pc);
			break;
		case OPT_SHOW_BUILD:
			show_build();
			break;
		default:
			fprintf(stderr, "\nInvalid option %s: %s\n\n",
				  poptBadOption(pc, 0), poptStrerror(opt));
			poptPrintUsage(pc, stderr, 0);
			return 1;
		}
	}

	if (opt_daemon && opt_interactive) {
		fprintf(stderr,"\nERROR: "
			  "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
		poptPrintUsage(pc, stderr, 0);
		return 1;
	} else if (!opt_interactive) {
		/* default is --daemon */
		opt_daemon = true;
	}

	poptFreeContext(pc);

	setup_logging(binary_name, opt_interactive?DEBUG_STDOUT:DEBUG_FILE);
	setup_signals();

	/* we want total control over the permissions on created files,
	   so set our umask to 0 */
	umask(0);

	DEBUG(0,("%s version %s started.\n", binary_name, SAMBA_VERSION_STRING));
	DEBUGADD(0,("Copyright Andrew Tridgell and the Samba Team 1992-2011\n"));

	if (sizeof(uint16_t) < 2 || sizeof(uint32_t) < 4 || sizeof(uint64_t) < 8) {
		DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
		DEBUGADD(0,("sizeof(uint16_t) = %u, sizeof(uint32_t) %u, sizeof(uint64_t) = %u\n",
			    (unsigned int)sizeof(uint16_t), (unsigned int)sizeof(uint32_t), (unsigned int)sizeof(uint64_t)));
		return 1;
	}

	if (opt_daemon) {
		DEBUG(3,("Becoming a daemon.\n"));
		become_daemon(true, false, false);
	}

	cleanup_tmp_files(cmdline_lp_ctx);

	if (!directory_exist(lpcfg_lockdir(cmdline_lp_ctx))) {
		mkdir(lpcfg_lockdir(cmdline_lp_ctx), 0755);
	}

	pidfile_create(lpcfg_piddir(cmdline_lp_ctx), binary_name);

	/* Set up a database to hold a random seed, in case we don't
	 * have /dev/urandom */
	if (!randseed_init(talloc_autofree_context(), cmdline_lp_ctx)) {
		return 1;
	}

	if (lpcfg_server_role(cmdline_lp_ctx) == ROLE_DOMAIN_CONTROLLER) {
		if (!open_schannel_session_store(talloc_autofree_context(), cmdline_lp_ctx)) {
			DEBUG(0,("ERROR: Samba cannot open schannel store for secured NETLOGON operations.\n"));
			exit(1);
		}
	}

	gensec_init(); /* FIXME: */

	ntptr_init();	/* FIXME: maybe run this in the initialization function 
						of the spoolss RPC server instead? */

	ntvfs_init(cmdline_lp_ctx); 	/* FIXME: maybe run this in the initialization functions 
						of the SMB[,2] server instead? */

	process_model_init(cmdline_lp_ctx); 

	shared_init = load_samba_modules(NULL, "service");

	run_init_functions(static_init);
	run_init_functions(shared_init);

	talloc_free(shared_init);
	
	/* the event context is the top level structure in smbd. Everything else
	   should hang off that */
	event_ctx = s4_event_context_init(talloc_autofree_context());

	if (event_ctx == NULL) {
		DEBUG(0,("Initializing event context failed\n"));
		return 1;
	}

	if (opt_interactive) {
		/* terminate when stdin goes away */
		stdin_event_flags = TEVENT_FD_READ;
	} else {
		/* stay alive forever */
		stdin_event_flags = 0;
	}

	/* catch EOF on stdin */
#ifdef SIGTTIN
	signal(SIGTTIN, SIG_IGN);
#endif
	tevent_add_fd(event_ctx, event_ctx, 0, stdin_event_flags,
		      server_stdin_handler,
		      discard_const(binary_name));

	if (max_runtime) {
		DEBUG(0,("Called with maxruntime %d - current ts %llu\n",
		      max_runtime, (unsigned long long) time(NULL)));
		tevent_add_timer(event_ctx, event_ctx,
				 timeval_current_ofs(max_runtime, 0),
				 max_runtime_handler,
				 discard_const(binary_name));
	}

	prime_ldb_databases(event_ctx);

	status = setup_parent_messaging(event_ctx, cmdline_lp_ctx);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("Failed to setup parent messaging - %s\n", nt_errstr(status)));
		return 1;
	}

	DEBUG(0,("%s: using '%s' process model\n", binary_name, model));

	status = server_service_startup(event_ctx, cmdline_lp_ctx, model, 
					lpcfg_server_services(cmdline_lp_ctx));
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("Starting Services failed - %s\n", nt_errstr(status)));
		return 1;
	}

	/* wait for events - this is where smbd sits for most of its
	   life */
	tevent_loop_wait(event_ctx);

	/* as everything hangs off this event context, freeing it
	   should initiate a clean shutdown of all services */
	talloc_free(event_ctx);

	return 0;
}

int main(int argc, const char *argv[])
{
	return binary_smbd_main("samba", argc, argv);
}