r24809: Consolidate the use of temporary talloc contexts.

[Samba.git] / source / 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 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"

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");
        }
        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");
        }
        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"));
}


/****************************************************************************
 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;
}

/****************************************************************************
 Are we idle enough that we could safely exit?
****************************************************************************/

static BOOL smbd_is_idle(void)
{
        /* Currently we define "idle" as having no client connections. */
        return count_all_current_connections() == 0;
}

/****************************************************************************
 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]);
        }


        /* Setup the main smbd so that we can get messages. Note that
           do this after starting listening. This is needed as when in
           clustered mode, ctdb won't allow us to start doing database
           operations until it has gone thru a full startup, which
           includes checking to see that smbd is listening. */
        claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_SMBD);

        /* Listen to messages */

        messaging_register(smbd_messaging_context(), NULL,
                           MSG_SMB_SAM_SYNC, msg_sam_sync);
        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;
                
                /* 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);

                if (timeval_is_zero(&idle_timeout)) {
                        num = sys_select(maxfd + 1, &r_fds, &w_fds,
                                        NULL, NULL);
                } else {
                        num = sys_select(maxfd + 1, &r_fds, &w_fds,
                                        NULL, &idle_timeout);

                        /* If the idle timeout fired and we are idle, exit
                         * gracefully. We expect to be running under a process
                         * controller that will restart us if necessry.
                         */
                        if (num == 0 && smbd_is_idle()) {
                                exit_server_cleanly("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;
                }

                /* 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;

                DEBUGLEVEL = 10;

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

                log_stack_trace();

                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;
        BOOL print_build_options = False;

        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':
                        print_build_options = True;
                        break;
                default:
                        d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
                                  poptBadOption(pc, 0), poptStrerror(opt));
                        poptPrintUsage(pc, stderr, 0);
                        exit(1);
                }
        }
        poptFreeContext(pc);

        if (print_build_options) {
                build_options(True); /* Display output to screen as well as debug */
                exit(0);
        }

#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;
        }

        /* 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();

        /*
         * For clustering, we need to re-init our ctdbd connection after the
         * fork
         */
        if (!NT_STATUS_IS_OK(messaging_reinit(smbd_messaging_context())))
                exit(1);

        /* 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);
}