samba-mirror/source3/smbd/server.c

/* 
   Unix SMB/CIFS implementation.
   Main SMB server routines
   Copyright (C) Andrew Tridgell		1992-1998
   Copyright (C) Martin Pool			2002
   Copyright (C) Jelmer Vernooij		2002-2003
   Copyright (C) James Peach			2007
   
   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

static_decl_rpc;

static int am_parent = 1;

/* the last message the was processed */
int last_message = -1;

/* a useful macro to debug the last message processed */
#define LAST_MESSAGE() smb_fn_name(last_message)

extern struct auth_context *negprot_global_auth_context;
extern pstring user_socket_options;
extern SIG_ATOMIC_T got_sig_term;
extern SIG_ATOMIC_T reload_after_sighup;
static SIG_ATOMIC_T got_sig_cld;

#ifdef WITH_DFS
extern int dcelogin_atmost_once;
#endif /* WITH_DFS */

/* really we should have a top level context structure that has the
   client file descriptor as an element. That would require a major rewrite :(

   the following 2 functions are an alternative - they make the file
   descriptor private to smbd
 */
static int server_fd = -1;

int smbd_server_fd(void)
{
	return server_fd;
}

static void smbd_set_server_fd(int fd)
{
	server_fd = fd;
	client_setfd(fd);
}

struct event_context *smbd_event_context(void)
{
	static struct event_context *ctx;

	if (!ctx && !(ctx = event_context_init(NULL))) {
		smb_panic("Could not init smbd event context\n");
	}
	return ctx;
}

struct messaging_context *smbd_messaging_context(void)
{
	static struct messaging_context *ctx;

	if (!ctx && !(ctx = messaging_init(NULL, server_id_self(),
					   smbd_event_context()))) {
		smb_panic("Could not init smbd messaging context\n");
	}
	return ctx;
}

/*******************************************************************
 What to do when smb.conf is updated.
 ********************************************************************/

static void smb_conf_updated(struct messaging_context *msg,
			     void *private_data,
			     uint32_t msg_type,
			     struct server_id server_id,
			     DATA_BLOB *data)
{
	DEBUG(10,("smb_conf_updated: Got message saying smb.conf was "
		  "updated. Reloading.\n"));
	reload_services(False);
}


/*******************************************************************
 Delete a statcache entry.
 ********************************************************************/

static void smb_stat_cache_delete(struct messaging_context *msg,
				  void *private_data,
				  uint32_t msg_tnype,
				  struct server_id server_id,
				  DATA_BLOB *data)
{
	const char *name = (const char *)data->data;
	DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
	stat_cache_delete(name);
}

/****************************************************************************
 Terminate signal.
****************************************************************************/

static void sig_term(void)
{
	got_sig_term = 1;
	sys_select_signal(SIGTERM);
}

/****************************************************************************
 Catch a sighup.
****************************************************************************/

static void sig_hup(int sig)
{
	reload_after_sighup = 1;
	sys_select_signal(SIGHUP);
}

/****************************************************************************
 Catch a sigcld
****************************************************************************/
static void sig_cld(int sig)
{
	got_sig_cld = 1;
	sys_select_signal(SIGCLD);
}

/****************************************************************************
  Send a SIGTERM to our process group.
*****************************************************************************/

static void  killkids(void)
{
	if(am_parent) kill(0,SIGTERM);
}

/****************************************************************************
 Process a sam sync message - not sure whether to do this here or
 somewhere else.
****************************************************************************/

static void msg_sam_sync(struct messaging_context *msg,
			 void *private_data,
			 uint32_t msg_type,
			 struct server_id server_id,
			 DATA_BLOB *data)
{
        DEBUG(10, ("** sam sync message received, ignoring\n"));
}

/****************************************************************************
 Process a sam sync replicate message - not sure whether to do this here or
 somewhere else.
****************************************************************************/

static void msg_sam_repl(struct messaging_context *msg,
			 void *private_data,
			 uint32_t msg_type,
			 struct server_id server_id,
			 DATA_BLOB *data)
{
        uint32 low_serial;

        if (data->length != sizeof(low_serial))
                return;

        low_serial = *((uint32 *)data->data);

        DEBUG(3, ("received sam replication message, serial = 0x%04x\n",
                  low_serial));
}

/****************************************************************************
 Open the socket communication - inetd.
****************************************************************************/

static BOOL open_sockets_inetd(void)
{
	/* Started from inetd. fd 0 is the socket. */
	/* We will abort gracefully when the client or remote system 
	   goes away */
	smbd_set_server_fd(dup(0));
	
	/* close our standard file descriptors */
	close_low_fds(False); /* Don't close stderr */
	
	set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
	set_socket_options(smbd_server_fd(), user_socket_options);

	return True;
}

static void msg_exit_server(struct messaging_context *msg,
			    void *private_data,
			    uint32_t msg_type,
			    struct server_id server_id,
			    DATA_BLOB *data)
{
	DEBUG(3, ("got a SHUTDOWN message\n"));
	exit_server_cleanly(NULL);
}

#ifdef DEVELOPER
static void msg_inject_fault(struct messaging_context *msg,
			     void *private_data,
			     uint32_t msg_type,
			     struct server_id src,
			     DATA_BLOB *data)
{
	int sig;

	if (data->length != sizeof(sig)) {
		
		DEBUG(0, ("Process %s sent bogus signal injection request\n",
			  procid_str_static(&src)));
		return;
	}

	sig = *(int *)data->data;
	if (sig == -1) {
		exit_server("internal error injected");
		return;
	}

#if HAVE_STRSIGNAL
	DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
		  procid_str_static(&src), sig, strsignal(sig)));
#else
	DEBUG(0, ("Process %s requested injection of signal %d\n",
		  procid_str_static(&src), sig));
#endif

	kill(sys_getpid(), sig);
}
#endif /* DEVELOPER */

struct child_pid {
	struct child_pid *prev, *next;
	pid_t pid;
};

static struct child_pid *children;
static int num_children;

static void add_child_pid(pid_t pid)
{
	struct child_pid *child;

	if (lp_max_smbd_processes() == 0) {
		/* Don't bother with the child list if we don't care anyway */
		return;
	}

	child = SMB_MALLOC_P(struct child_pid);
	if (child == NULL) {
		DEBUG(0, ("Could not add child struct -- malloc failed\n"));
		return;
	}
	child->pid = pid;
	DLIST_ADD(children, child);
	num_children += 1;
}

static void remove_child_pid(pid_t pid)
{
	struct child_pid *child;

	if (lp_max_smbd_processes() == 0) {
		/* Don't bother with the child list if we don't care anyway */
		return;
	}

	for (child = children; child != NULL; child = child->next) {
		if (child->pid == pid) {
			struct child_pid *tmp = child;
			DLIST_REMOVE(children, child);
			SAFE_FREE(tmp);
			num_children -= 1;
			return;
		}
	}

	DEBUG(0, ("Could not find child %d -- ignoring\n", (int)pid));
}

/****************************************************************************
 Have we reached the process limit ?
****************************************************************************/

static BOOL allowable_number_of_smbd_processes(void)
{
	int max_processes = lp_max_smbd_processes();

	if (!max_processes)
		return True;

	return num_children < max_processes;
}

/****************************************************************************
 Open the socket communication.
****************************************************************************/

static BOOL open_sockets_smbd(enum smb_server_mode server_mode, const char *smb_ports)
{
	int num_sockets = 0;
	int fd_listenset[FD_SETSIZE];
	fd_set listen_set;
	int s;
	int maxfd = 0;
	int i;
	struct timeval idle_timeout = timeval_zero();

	if (server_mode == SERVER_MODE_INETD) {
		return open_sockets_inetd();
	}

#ifdef HAVE_ATEXIT
	{
		static int atexit_set;
		if(atexit_set == 0) {
			atexit_set=1;
			atexit(killkids);
		}
	}
#endif

	/* Stop zombies */
	CatchSignal(SIGCLD, sig_cld);

	FD_ZERO(&listen_set);

	/* At this point, it doesn't matter what daemon mode we are in, we
	 * need some sockets to listen on.
	 */
	num_sockets = smbd_sockinit(smb_ports, fd_listenset, &idle_timeout);
	if (num_sockets == 0) {
		return False;
	}

	for (i = 0; i < num_sockets; ++i) {
		FD_SET(fd_listenset[i], &listen_set);
		maxfd = MAX(maxfd, fd_listenset[i]);
	}

        /* Listen to messages */

	messaging_register(smbd_messaging_context(), NULL,
			   MSG_SMB_SAM_SYNC, msg_sam_sync);
	messaging_register(smbd_messaging_context(), NULL,
			   MSG_SMB_SAM_REPL, msg_sam_repl);
	messaging_register(smbd_messaging_context(), NULL,
			   MSG_SHUTDOWN, msg_exit_server);
	messaging_register(smbd_messaging_context(), NULL,
			   MSG_SMB_FILE_RENAME, msg_file_was_renamed);
	messaging_register(smbd_messaging_context(), NULL,
			   MSG_SMB_CONF_UPDATED, smb_conf_updated); 
	messaging_register(smbd_messaging_context(), NULL,
			   MSG_SMB_STAT_CACHE_DELETE, smb_stat_cache_delete);
	brl_register_msgs(smbd_messaging_context());

#ifdef DEVELOPER
	messaging_register(smbd_messaging_context(), NULL,
			   MSG_SMB_INJECT_FAULT, msg_inject_fault);
#endif

	/* now accept incoming connections - forking a new process
	   for each incoming connection */
	DEBUG(2,("waiting for a connection\n"));
	while (1) {
		struct timeval now;
		fd_set r_fds, w_fds;
		int num;
		
		/* Free up temporary memory from the main smbd. */
		lp_TALLOC_FREE();

		/* Ensure we respond to PING and DEBUG messages from the main smbd. */
		message_dispatch(smbd_messaging_context());

		if (got_sig_cld) {
			pid_t pid;
			got_sig_cld = False;

			while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
				remove_child_pid(pid);
			}
		}

		memcpy((char *)&r_fds, (char *)&listen_set, 
		       sizeof(listen_set));
		FD_ZERO(&w_fds);
		GetTimeOfDay(&now);

		event_add_to_select_args(smbd_event_context(), &now,
					 &r_fds, &w_fds, &idle_timeout,
					 &maxfd);

		num = sys_select(maxfd+1,&r_fds,&w_fds,NULL,
				 timeval_is_zero(&idle_timeout) ?
				 NULL : &idle_timeout);
		
		if (num == -1 && errno == EINTR) {
			if (got_sig_term) {
				exit_server_cleanly(NULL);
			}

			/* check for sighup processing */
			if (reload_after_sighup) {
				change_to_root_user();
				DEBUG(1,("Reloading services after SIGHUP\n"));
				reload_services(False);
				reload_after_sighup = 0;
			}

			continue;
		}

		if (run_events(smbd_event_context(), num, &r_fds, &w_fds)) {
			continue;
		}

#if 0
		Deactivated for now, this needs to become a timed event
		vl

		/* If the idle timeout fired and we don't have any connected
		 * users, exit gracefully. We should be running under a process
		 * controller that will restart us if necessry.
		 */
		if (num == 0 && count_all_current_connections() == 0) {
			exit_server_cleanly("idle timeout");
		}
#endif

		/* check if we need to reload services */
		check_reload(time(NULL));

		/* Find the sockets that are read-ready -
		   accept on these. */
		for( ; num > 0; num--) {
			struct sockaddr addr;
			socklen_t in_addrlen = sizeof(addr);
			pid_t child = 0;

			s = -1;
			for(i = 0; i < num_sockets; i++) {
				if(FD_ISSET(fd_listenset[i],&r_fds)) {
					s = fd_listenset[i];
					/* Clear this so we don't look
					   at it again. */
					FD_CLR(fd_listenset[i],&r_fds);
					break;
				}
			}

			smbd_set_server_fd(accept(s,&addr,&in_addrlen));
			
			if (smbd_server_fd() == -1 && errno == EINTR)
				continue;
			
			if (smbd_server_fd() == -1) {
				DEBUG(0,("open_sockets_smbd: accept: %s\n",
					 strerror(errno)));
				continue;
			}

			/* Ensure child is set to blocking mode */
			set_blocking(smbd_server_fd(),True);

			/* In interactive mode, return with a connected socket.
			 * Foreground and daemon modes should fork worker
			 * processes.
			 */
			if (server_mode == SERVER_MODE_INTERACTIVE) {
				return True;
			}
			
			if (allowable_number_of_smbd_processes() &&
			    smbd_server_fd() != -1 &&
			    ((child = sys_fork())==0)) {
				/* Child code ... */

				/* Stop zombies, the parent explicitly handles
				 * them, counting worker smbds. */
				CatchChild();
				
				/* close the listening socket(s) */
				for(i = 0; i < num_sockets; i++)
					close(fd_listenset[i]);
				
				/* close our standard file
				   descriptors */
				close_low_fds(False);
				am_parent = 0;
				
				set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
				set_socket_options(smbd_server_fd(),user_socket_options);
				
				/* this is needed so that we get decent entries
				   in smbstatus for port 445 connects */
				set_remote_machine_name(get_peer_addr(smbd_server_fd()),
							False);
				
				/* Reset the state of the random
				 * number generation system, so
				 * children do not get the same random
				 * numbers as each other */

				set_need_random_reseed();
				/* tdb needs special fork handling - remove
				 * CLEAR_IF_FIRST flags */
				if (tdb_reopen_all(1) == -1) {
					DEBUG(0,("tdb_reopen_all failed.\n"));
					smb_panic("tdb_reopen_all failed.");
				}

				return True; 
			}
			/* The parent doesn't need this socket */
			close(smbd_server_fd()); 

			/* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
				Clear the closed fd info out of server_fd --
				and more importantly, out of client_fd in
				util_sock.c, to avoid a possible
				getpeername failure if we reopen the logs
				and use %I in the filename.
			*/

			smbd_set_server_fd(-1);

			if (child != 0) {
				add_child_pid(child);
			}

			/* Force parent to check log size after
			 * spawning child.  Fix from
			 * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
			 * parent smbd will log to logserver.smb.  It
			 * writes only two messages for each child
			 * started/finished. But each child writes,
			 * say, 50 messages also in logserver.smb,
			 * begining with the debug_count of the
			 * parent, before the child opens its own log
			 * file logserver.client. In a worst case
			 * scenario the size of logserver.smb would be
			 * checked after about 50*50=2500 messages
			 * (ca. 100kb).
			 * */
			force_check_log_size();
 
		} /* end for num */
	} /* end while 1 */

/* NOTREACHED	return True; */
}

/****************************************************************************
 Reload printers
**************************************************************************/
void reload_printers(void)
{
	int snum;
	int n_services = lp_numservices();
	int pnum = lp_servicenumber(PRINTERS_NAME);
	const char *pname;

	pcap_cache_reload();

	/* remove stale printers */
	for (snum = 0; snum < n_services; snum++) {
		/* avoid removing PRINTERS_NAME or non-autoloaded printers */
		if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
		                      lp_autoloaded(snum)))
			continue;

		pname = lp_printername(snum);
		if (!pcap_printername_ok(pname)) {
			DEBUG(3, ("removing stale printer %s\n", pname));

			if (is_printer_published(NULL, snum, NULL))
				nt_printer_publish(NULL, snum, SPOOL_DS_UNPUBLISH);
			del_a_printer(pname);
			lp_killservice(snum);
		}
	}

	load_printers();
}

/****************************************************************************
 Reload the services file.
**************************************************************************/

BOOL reload_services(BOOL test)
{
	BOOL ret;
	
	if (lp_loaded()) {
		pstring fname;
		pstrcpy(fname,lp_configfile());
		if (file_exist(fname, NULL) &&
		    !strcsequal(fname, dyn_CONFIGFILE)) {
			pstrcpy(dyn_CONFIGFILE, fname);
			test = False;
		}
	}

	reopen_logs();

	if (test && !lp_file_list_changed())
		return(True);

	lp_killunused(conn_snum_used);

	ret = lp_load(dyn_CONFIGFILE, False, False, True, True);

	reload_printers();

	/* perhaps the config filename is now set */
	if (!test)
		reload_services(True);

	reopen_logs();

	load_interfaces();

	if (smbd_server_fd() != -1) {      
		set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
		set_socket_options(smbd_server_fd(), user_socket_options);
	}

	mangle_reset_cache();
	reset_stat_cache();

	/* this forces service parameters to be flushed */
	set_current_service(NULL,0,True);

	return(ret);
}

/****************************************************************************
 Exit the server.
****************************************************************************/

/* Reasons for shutting down a server process. */
enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };

static void exit_server_common(enum server_exit_reason how,
	const char *const reason) NORETURN_ATTRIBUTE;

static void exit_server_common(enum server_exit_reason how,
	const char *const reason)
{
	static int firsttime=1;

	if (!firsttime)
		exit(0);
	firsttime = 0;

	change_to_root_user();

	if (negprot_global_auth_context) {
		(negprot_global_auth_context->free)(&negprot_global_auth_context);
	}

	conn_close_all();

	invalidate_all_vuids();

	/* 3 second timeout. */
	print_notify_send_messages(smbd_messaging_context(), 3);

	/* delete our entry in the connections database. */
	yield_connection(NULL,"");

	respond_to_all_remaining_local_messages();

#ifdef WITH_DFS
	if (dcelogin_atmost_once) {
		dfs_unlogin();
	}
#endif

	locking_end();
	printing_end();

	server_encryption_shutdown();

	if (how != SERVER_EXIT_NORMAL) {
		int oldlevel = DEBUGLEVEL;
		char *last_inbuf = get_InBuffer();

		DEBUGLEVEL = 10;

		DEBUGSEP(0);
		DEBUG(0,("Abnormal server exit: %s\n",
			reason ? reason : "no explanation provided"));
		DEBUGSEP(0);

		log_stack_trace();
		if (last_inbuf) {
			DEBUG(0,("Last message was %s\n", LAST_MESSAGE()));
			show_msg(last_inbuf);
		}

		DEBUGLEVEL = oldlevel;
		dump_core();

	} else {    
		DEBUG(3,("Server exit (%s)\n",
			(reason ? reason : "normal exit")));
	}

	exit(0);
}

void exit_server(const char *const explanation)
{
	exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
}

void exit_server_cleanly(const char *const explanation)
{
	exit_server_common(SERVER_EXIT_NORMAL, explanation);
}

void exit_server_fault(void)
{
	exit_server("critical server fault");
}

/****************************************************************************
 Initialise connect, service and file structs.
****************************************************************************/

static BOOL init_structs(void )
{
	/*
	 * Set the machine NETBIOS name if not already
	 * set from the config file.
	 */

	if (!init_names())
		return False;

	conn_init();

	file_init();

	/* for RPC pipes */
	init_rpc_pipe_hnd();

	init_dptrs();

	secrets_init();

	return True;
}

/*
 * Send keepalive packets to our client
 */
static BOOL keepalive_fn(const struct timeval *now, void *private_data)
{
	if (!send_keepalive(smbd_server_fd())) {
		DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
		return False;
	}
	return True;
}

/*
 * Do the recurring check if we're idle
 */
static BOOL deadtime_fn(const struct timeval *now, void *private_data)
{
	if ((conn_num_open() == 0)
	    || (conn_idle_all(now->tv_sec))) {
		DEBUG( 2, ( "Closing idle connection\n" ) );
		messaging_send(smbd_messaging_context(), procid_self(),
			       MSG_SHUTDOWN, &data_blob_null);
		return False;
	}

	return True;
}


/****************************************************************************
 main program.
****************************************************************************/

/* Declare prototype for build_options() to avoid having to run it through
   mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
   prototype generation system is too complicated. */

extern void build_options(BOOL screen);

 int main(int argc,const char *argv[])
{
	/* shall I run as a daemon */
	BOOL no_process_group = False;
	BOOL log_stdout = False;
	const char *ports = NULL;
	const char *profile_level = NULL;
	int opt;
	poptContext pc;

	enum smb_server_mode server_mode = SERVER_MODE_DAEMON;

	struct poptOption long_options[] = {
	POPT_AUTOHELP
	{"daemon", 'D', POPT_ARG_VAL, &server_mode, SERVER_MODE_DAEMON,
		"Become a daemon (default)" },
	{"interactive", 'i', POPT_ARG_VAL, &server_mode, SERVER_MODE_INTERACTIVE,
		"Run interactive (not a daemon)"},
	{"foreground", 'F', POPT_ARG_VAL, &server_mode, SERVER_MODE_FOREGROUND,
		"Run daemon in foreground (for daemontools, etc.)" },
	{"no-process-group", '\0', POPT_ARG_VAL, &no_process_group, True,
		"Don't create a new process group" },
	{"log-stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
	{"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
	{"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
	{"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
	POPT_COMMON_SAMBA
	POPT_COMMON_DYNCONFIG
	POPT_TABLEEND
	};

	load_case_tables();

	TimeInit();

#ifdef HAVE_SET_AUTH_PARAMETERS
	set_auth_parameters(argc,argv);
#endif

	pc = poptGetContext("smbd", argc, argv, long_options, 0);
	
	while((opt = poptGetNextOpt(pc)) != -1) {
		switch (opt)  {
		case 'b':
			build_options(True); /* Display output to screen as well as debug */ 
			exit(0);
			break;
		}
	}

	poptFreeContext(pc);

#ifdef HAVE_SETLUID
	/* needed for SecureWare on SCO */
	setluid(0);
#endif

	sec_init();

	set_remote_machine_name("smbd", False);

	if (server_mode == SERVER_MODE_INTERACTIVE) {
		log_stdout = True;
		if (DEBUGLEVEL >= 9) {
			talloc_enable_leak_report();
		}
	}

	if (log_stdout && server_mode == SERVER_MODE_DAEMON) {
		DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
		exit(1);
	}

	setup_logging(argv[0],log_stdout);

	/* we want to re-seed early to prevent time delays causing
           client problems at a later date. (tridge) */
	generate_random_buffer(NULL, 0);

	/* make absolutely sure we run as root - to handle cases where people
	   are crazy enough to have it setuid */

	gain_root_privilege();
	gain_root_group_privilege();

	fault_setup((void (*)(void *))exit_server_fault);
	dump_core_setup("smbd");

	CatchSignal(SIGTERM , SIGNAL_CAST sig_term);
	CatchSignal(SIGHUP,SIGNAL_CAST sig_hup);
	
	/* we are never interested in SIGPIPE */
	BlockSignals(True,SIGPIPE);

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

#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 recieve them. */
	BlockSignals(False, SIGHUP);
	BlockSignals(False, SIGUSR1);
	BlockSignals(False, SIGTERM);

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

	init_sec_ctx();

	reopen_logs();

	DEBUG(0,( "smbd version %s started.\n", SAMBA_VERSION_STRING));
	DEBUGADD( 0, ( "%s\n", COPYRIGHT_STARTUP_MESSAGE ) );

	DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
		 (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));

	/* Output the build options to the debug log */ 
	build_options(False);

	if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
		DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
		exit(1);
	}

	/*
	 * Do this before reload_services.
	 */

	if (!reload_services(False))
		return(-1);	

	init_structs();

#ifdef WITH_PROFILE
	if (!profile_setup(smbd_messaging_context(), False)) {
		DEBUG(0,("ERROR: failed to setup profiling\n"));
		return -1;
	}
	if (profile_level != NULL) {
		int pl = atoi(profile_level);
		struct server_id src;

		DEBUG(1, ("setting profiling level: %s\n",profile_level));
		src.pid = getpid();
		set_profile_level(pl, src);
	}
#endif

	DEBUG(3,( "loaded services\n"));

	if (is_a_socket(0)) {
		if (server_mode == SERVER_MODE_DAEMON) {
			DEBUG(0,("standard input is a socket, "
				    "assuming -F option\n"));
		}
		server_mode = SERVER_MODE_INETD;
	}

	if (server_mode == SERVER_MODE_DAEMON) {
		DEBUG( 3, ( "Becoming a daemon.\n" ) );
		become_daemon(True, no_process_group);
	} else if (server_mode == SERVER_MODE_FOREGROUND) {
		become_daemon(False, no_process_group);
	}

#if HAVE_SETPGID
	/*
	 * If we're interactive we want to set our own process group for
	 * signal management.
	 */
	if (server_mode == SERVER_MODE_INTERACTIVE && !no_process_group) {
		setpgid( (pid_t)0, (pid_t)0);
	}
#endif

	if (!directory_exist(lp_lockdir(), NULL))
		mkdir(lp_lockdir(), 0755);

	if (server_mode != SERVER_MODE_INETD &&
	    server_mode != SERVER_MODE_INTERACTIVE) {
		pidfile_create("smbd");
	}

	/* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */

	if (smbd_messaging_context() == NULL)
		exit(1);

	/* Initialise the password backed before the global_sam_sid
	   to ensure that we fetch from ldap before we make a domain sid up */

	if(!initialize_password_db(False, smbd_event_context()))
		exit(1);

	if (!secrets_init()) {
		DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
		exit(1);
	}

	if(!get_global_sam_sid()) {
		DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
		exit(1);
	}

	if (!session_init())
		exit(1);

	if (!connections_init(True))
		exit(1);

	if (!locking_init(0))
		exit(1);

	namecache_enable();

	if (!init_registry())
		exit(1);

#if 0
	if (!init_svcctl_db())
                exit(1);
#endif

	if (!print_backend_init(smbd_messaging_context()))
		exit(1);

	if (!init_guest_info()) {
		DEBUG(0,("ERROR: failed to setup guest info.\n"));
		return -1;
	}

	/* Setup the main smbd so that we can get messages. */
	/* don't worry about general printing messages here */

	claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_SMBD);

	/* only start the background queue daemon if we are 
	   running as a daemon -- bad things will happen if
	   smbd is launched via inetd and we fork a copy of 
	   ourselves here */
	if (server_mode != SERVER_MODE_INETD &&
	    server_mode != SERVER_MODE_INTERACTIVE) {
		start_background_queue(); 
	}

	/* Always attempt to initialize DMAPI. We will only use it later if
	 * lp_dmapi_support is set on the share, but we need a single global
	 * session to work with.
	 */
	dmapi_init_session();

	if (!open_sockets_smbd(server_mode, ports)) {
		exit(1);
	}

	/*
	 * everything after this point is run after the fork()
	 */ 

	static_init_rpc;

	init_modules();

	/* Possibly reload the services file. Only worth doing in
	 * daemon mode. In inetd mode, we know we only just loaded this.
	 */
	if (server_mode != SERVER_MODE_INETD &&
	    server_mode != SERVER_MODE_INTERACTIVE) {
		reload_services(True);
	}

	if (!init_account_policy()) {
		DEBUG(0,("Could not open account policy tdb.\n"));
		exit(1);
	}

	if (*lp_rootdir()) {
		if (sys_chroot(lp_rootdir()) == 0)
			DEBUG(2,("Changed root to %s\n", lp_rootdir()));
	}

	/* Setup oplocks */
	if (!init_oplocks(smbd_messaging_context()))
		exit(1);
	
	/* Setup aio signal handler. */
	initialize_async_io_handler();

	/* register our message handlers */
	messaging_register(smbd_messaging_context(), NULL,
			   MSG_SMB_FORCE_TDIS, msg_force_tdis);

	if ((lp_keepalive() != 0)
	    && !(event_add_idle(smbd_event_context(), NULL,
				timeval_set(lp_keepalive(), 0),
				"keepalive", keepalive_fn,
				NULL))) {
		DEBUG(0, ("Could not add keepalive event\n"));
		exit(1);
	}

	if (!(event_add_idle(smbd_event_context(), NULL,
			     timeval_set(IDLE_CLOSED_TIMEOUT, 0),
			     "deadtime", deadtime_fn, NULL))) {
		DEBUG(0, ("Could not add deadtime event\n"));
		exit(1);
	}

	smbd_process();

	namecache_shutdown();

	exit_server_cleanly(NULL);
	return(0);
}