Add support for MSG_SMB_CONF_UPDATED and MSG_SHUTDOWN to all daemons (smbd, nmbd...

[Samba/gebeck_regimport.git] / source / nsswitch / winbindd.c

/* 
   Unix SMB/CIFS implementation.

   Winbind daemon for ntdom nss module

   Copyright (C) by Tim Potter 2000-2002
   Copyright (C) Andrew Tridgell 2002
   Copyright (C) Jelmer Vernooij 2003
   
   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 "winbindd.h"

BOOL opt_nocache = False;
BOOL opt_dual_daemon = True;

/*****************************************************************************
 stubb functions 
****************************************************************************/

void become_root( void )
{
        return;
}

void unbecome_root( void )
{
        return;
}

/* Reload configuration */

static BOOL reload_services_file(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();
        ret = lp_load(dyn_CONFIGFILE,False,False,True);

        reopen_logs();
        load_interfaces();

        return(ret);
}


#if DUMP_CORE

/**************************************************************************** **
 Prepare to dump a core file - carefully!
 **************************************************************************** */

static BOOL dump_core(void)
{
        char *p;
        pstring dname;
        pstrcpy( dname, lp_logfile() );
        if ((p=strrchr(dname,'/')))
                *p=0;
        pstrcat( dname, "/corefiles" );
        mkdir( dname, 0700 );
        sys_chown( dname, getuid(), getgid() );
        chmod( dname, 0700 );
        if ( chdir(dname) )
                return( False );
        umask( ~(0700) );
 
#ifdef HAVE_GETRLIMIT
#ifdef RLIMIT_CORE
        {
                struct rlimit rlp;
                getrlimit( RLIMIT_CORE, &rlp );
                rlp.rlim_cur = MAX( 4*1024*1024, rlp.rlim_cur );
                setrlimit( RLIMIT_CORE, &rlp );
                getrlimit( RLIMIT_CORE, &rlp );
                DEBUG( 3, ( "Core limits now %d %d\n", (int)rlp.rlim_cur, (int)rlp.rlim_max ) );
        }
#endif
#endif
 
        DEBUG(0,("Dumping core in %s\n",dname));
        abort();
        return( True );
} /* dump_core */
#endif

/**************************************************************************** **
 Handle a fault..
 **************************************************************************** */

static void fault_quit(void)
{
#if DUMP_CORE
        dump_core();
#endif
}

static void winbindd_status(void)
{
        struct winbindd_cli_state *tmp;

        DEBUG(0, ("winbindd status:\n"));

        /* Print client state information */
        
        DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
        
        if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
                DEBUG(2, ("\tclient list:\n"));
                for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
                        DEBUG(2, ("\t\tpid %d, sock %d, rbl %d, wbl %d\n",
                                  tmp->pid, tmp->sock, tmp->read_buf_len, 
                                  tmp->write_buf_len));
                }
        }
}

/* Print winbindd status to log file */

static void print_winbindd_status(void)
{
        winbindd_status();
        winbindd_cm_status();
}

/* Flush client cache */

static void flush_caches(void)
{
#if 0
        /* Clear cached user and group enumation info */        
        if (!opt_dual_daemon) /* Until we have coherent cache flush. */
                wcache_flush_cache();
#endif

        /* We need to invalidate cached user list entries on a SIGHUP 
           otherwise cached access denied errors due to restrict anonymous
           hang around until the sequence number changes. */

        wcache_invalidate_cache();
}

/* Handle the signal by unlinking socket and exiting */

static void terminate(void)
{
        pstring path;

        idmap_close();
        
        /* Remove socket file */
        snprintf(path, sizeof(path), "%s/%s", 
                 WINBINDD_SOCKET_DIR, WINBINDD_SOCKET_NAME);
        unlink(path);
        exit(0);
}

static BOOL do_sigterm;

static void termination_handler(int signum)
{
        do_sigterm = True;
        sys_select_signal();
}

static BOOL do_sigusr2;

static void sigusr2_handler(int signum)
{
        do_sigusr2 = True;
        sys_select_signal();
}

static BOOL do_sighup;

static void sighup_handler(int signum)
{
        do_sighup = True;
        sys_select_signal();
}

/* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
static void msg_reload_services(int msg_type, pid_t src, void *buf, size_t len)
{
        /* Flush various caches */
        flush_caches();
        reload_services_file(True);
}

/* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
static void msg_shutdown(int msg_type, pid_t src, void *buf, size_t len)
{
        terminate();
}

struct dispatch_table {
        enum winbindd_cmd cmd;
        enum winbindd_result (*fn)(struct winbindd_cli_state *state);
        const char *winbindd_cmd_name;
};

static struct dispatch_table dispatch_table[] = {
        
        /* User functions */

        { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
        { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },

        { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
        { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
        { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },

        { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },

        /* Group functions */

        { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
        { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
        { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
        { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
        { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
        { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },

        /* PAM auth functions */

        { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
        { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
        { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },

        /* Enumeration functions */

        { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
        { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
        { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains, "LIST_TRUSTDOM" },
        { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },

        /* SID related functions */

        { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
        { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },

        /* Lookup related functions */

        { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
        { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
        { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
        { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },

        /* Miscellaneous */

        { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
        { WINBINDD_PING, winbindd_ping, "PING" },
        { WINBINDD_INFO, winbindd_info, "INFO" },
        { WINBINDD_INTERFACE_VERSION, winbindd_interface_version, "INTERFACE_VERSION" },
        { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
        { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
        { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir, "WINBINDD_PRIV_PIPE_DIR" },

        /* WINS functions */

        { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
        { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
        
        /* UNIX account management functions */
        { WINBINDD_CREATE_USER,                 winbindd_create_user,           "CREATE_USER"           },
        { WINBINDD_CREATE_GROUP,                winbindd_create_group,          "CREATE_GROUP"          },
        { WINBINDD_ADD_USER_TO_GROUP,           winbindd_add_user_to_group,     "ADD_USER_TO_GROUP"     },
        { WINBINDD_REMOVE_USER_FROM_GROUP,      winbindd_remove_user_from_group,"REMOVE_USER_FROM_GROUP"},
        { WINBINDD_SET_USER_PRIMARY_GROUP,      winbindd_set_user_primary_group,"SET_USER_PRIMARY_GROUP"},
        { WINBINDD_DELETE_USER,                 winbindd_delete_user,           "DELETE_USER"           },
        { WINBINDD_DELETE_GROUP,                winbindd_delete_group,          "DELETE_GROUP"          },
        
        /* End of list */

        { WINBINDD_NUM_CMDS, NULL, "NONE" }
};

static void process_request(struct winbindd_cli_state *state)
{
        struct dispatch_table *table = dispatch_table;

        /* Free response data - we may be interrupted and receive another
           command before being able to send this data off. */

        SAFE_FREE(state->response.extra_data);  

        ZERO_STRUCT(state->response);

        state->response.result = WINBINDD_ERROR;
        state->response.length = sizeof(struct winbindd_response);

        /* Process command */

        for (table = dispatch_table; table->fn; table++) {
                if (state->request.cmd == table->cmd) {
                        DEBUG(10,("process_request: request fn %s\n", table->winbindd_cmd_name ));
                        state->response.result = table->fn(state);
                        break;
                }
        }

        if (!table->fn)
                DEBUG(10,("process_request: unknown request fn number %d\n", (int)state->request.cmd ));

        /* In case extra data pointer is NULL */

        if (!state->response.extra_data)
                state->response.length = sizeof(struct winbindd_response);
}

/* Process a new connection by adding it to the client connection list */

static void new_connection(int listen_sock, BOOL privileged)
{
        struct sockaddr_un sunaddr;
        struct winbindd_cli_state *state;
        socklen_t len;
        int sock;
        
        /* Accept connection */
        
        len = sizeof(sunaddr);

        do {
                sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
        } while (sock == -1 && errno == EINTR);

        if (sock == -1)
                return;
        
        DEBUG(6,("accepted socket %d\n", sock));
        
        /* Create new connection structure */
        
        if ((state = (struct winbindd_cli_state *) 
             malloc(sizeof(*state))) == NULL)
                return;
        
        ZERO_STRUCTP(state);
        state->sock = sock;

        state->last_access = time(NULL);        

        state->privileged = privileged;

        /* Add to connection list */
        
        winbindd_add_client(state);
}

/* Remove a client connection from client connection list */

static void remove_client(struct winbindd_cli_state *state)
{
        /* It's a dead client - hold a funeral */
        
        if (state != NULL) {
                
                /* Close socket */
                
                close(state->sock);
                
                /* Free any getent state */
                
                free_getent_state(state->getpwent_state);
                free_getent_state(state->getgrent_state);
                
                /* We may have some extra data that was not freed if the
                   client was killed unexpectedly */

                SAFE_FREE(state->response.extra_data);
                
                /* Remove from list and free */
                
                winbindd_remove_client(state);
                SAFE_FREE(state);
        }
}


/* Shutdown client connection which has been idle for the longest time */

static BOOL remove_idle_client(void)
{
        struct winbindd_cli_state *state, *remove_state = NULL;
        time_t last_access = 0;
        int nidle = 0;

        for (state = winbindd_client_list(); state; state = state->next) {
                if (state->read_buf_len == 0 && state->write_buf_len == 0 &&
                                !state->getpwent_state && !state->getgrent_state) {
                        nidle++;
                        if (!last_access || state->last_access < last_access) {
                                last_access = state->last_access;
                                remove_state = state;
                        }
                }
        }

        if (remove_state) {
                DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
                        nidle, remove_state->sock, (unsigned int)remove_state->pid));
                remove_client(remove_state);
                return True;
        }

        return False;
}

/* Process a complete received packet from a client */

void winbind_process_packet(struct winbindd_cli_state *state)
{
        /* Process request */
        
        /* Ensure null termination of entire request */
        state->request.null_term = '\0';

        state->pid = state->request.pid;
        
        process_request(state);

        /* Update client state */
        
        state->read_buf_len = 0;
        state->write_buf_len = sizeof(struct winbindd_response);

        /* we might need to send it to the dual daemon */
        if (opt_dual_daemon) {
                dual_send_request(state);
        }
}

/* Read some data from a client connection */

void winbind_client_read(struct winbindd_cli_state *state)
{
        int n;
    
        /* Read data */

        n = sys_read(state->sock, state->read_buf_len + 
                 (char *)&state->request, 
                 sizeof(state->request) - state->read_buf_len);
        
        DEBUG(10,("client_read: read %d bytes. Need %d more for a full request.\n", n, sizeof(state->request) - n - state->read_buf_len ));

        /* Read failed, kill client */
        
        if (n == -1 || n == 0) {
                DEBUG(5,("read failed on sock %d, pid %d: %s\n",
                         state->sock, state->pid, 
                         (n == -1) ? strerror(errno) : "EOF"));
                
                state->finished = True;
                return;
        }
        
        /* Update client state */
        
        state->read_buf_len += n;
        state->last_access = time(NULL);
}

/* Write some data to a client connection */

static void client_write(struct winbindd_cli_state *state)
{
        char *data;
        int num_written;
        
        /* Write some data */
        
        if (!state->write_extra_data) {

                /* Write response structure */
                
                data = (char *)&state->response + sizeof(state->response) - 
                        state->write_buf_len;

        } else {

                /* Write extra data */
                
                data = (char *)state->response.extra_data + 
                        state->response.length - 
                        sizeof(struct winbindd_response) - 
                        state->write_buf_len;
        }
        
        num_written = sys_write(state->sock, data, state->write_buf_len);
        
        DEBUG(10,("client_write: wrote %d bytes.\n", num_written ));

        /* Write failed, kill cilent */
        
        if (num_written == -1 || num_written == 0) {
                
                DEBUG(3,("write failed on sock %d, pid %d: %s\n",
                         state->sock, state->pid, 
                         (num_written == -1) ? strerror(errno) : "EOF"));
                
                state->finished = True;

                SAFE_FREE(state->response.extra_data);

                return;
        }
        
        /* Update client state */
        
        state->write_buf_len -= num_written;
        state->last_access = time(NULL);

        /* Have we written all data? */
        
        if (state->write_buf_len == 0) {
                
                /* Take care of extra data */
                
                if (state->write_extra_data) {

                        SAFE_FREE(state->response.extra_data);

                        state->write_extra_data = False;

                        DEBUG(10,("client_write: client_write: complete response written.\n"));

                } else if (state->response.length > 
                           sizeof(struct winbindd_response)) {
                        
                        /* Start writing extra data */

                        state->write_buf_len = 
                                state->response.length -
                                sizeof(struct winbindd_response);
                        
                        DEBUG(10,("client_write: need to write %d extra data bytes.\n", (int)state->write_buf_len));

                        state->write_extra_data = True;
                }
        }
}

/* Process incoming clients on listen_sock.  We use a tricky non-blocking,
   non-forking, non-threaded model which allows us to handle many
   simultaneous connections while remaining impervious to many denial of
   service attacks. */

static void process_loop(void)
{
        /* We'll be doing this a lot */

        while (1) {
                struct winbindd_cli_state *state;
                fd_set r_fds, w_fds;
                int maxfd, listen_sock, listen_priv_sock, selret;
                struct timeval timeout;

                /* Handle messages */

                message_dispatch();

                /* rescan the trusted domains list. This must be done
                   regularly to cope with transitive trusts */
                rescan_trusted_domains(False);

                /* Free up temporary memory */

                lp_talloc_free();
                main_loop_talloc_free();

                /* Initialise fd lists for select() */

                listen_sock = open_winbindd_socket();
                listen_priv_sock = open_winbindd_priv_socket();

                if (listen_sock == -1 || listen_priv_sock == -1) {
                        perror("open_winbind_socket");
                        exit(1);
                }

                maxfd = MAX(listen_sock, listen_priv_sock);

                FD_ZERO(&r_fds);
                FD_ZERO(&w_fds);
                FD_SET(listen_sock, &r_fds);
                FD_SET(listen_priv_sock, &r_fds);

                timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
                timeout.tv_usec = 0;

                if (opt_dual_daemon) {
                        maxfd = dual_select_setup(&w_fds, maxfd);
                }

                /* Set up client readers and writers */

                state = winbindd_client_list();

                while (state) {

                        /* Dispose of client connection if it is marked as 
                           finished */ 

                        if (state->finished) {
                                struct winbindd_cli_state *next = state->next;

                                remove_client(state);
                                state = next;
                                continue;
                        }

                        /* Select requires we know the highest fd used */

                        if (state->sock > maxfd)
                                maxfd = state->sock;

                        /* Add fd for reading */

                        if (state->read_buf_len != sizeof(state->request))
                                FD_SET(state->sock, &r_fds);

                        /* Add fd for writing */

                        if (state->write_buf_len)
                                FD_SET(state->sock, &w_fds);

                        state = state->next;
                }

                /* Call select */
        
                selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);

                if (selret == 0)
                        continue;

                if ((selret == -1 && errno != EINTR) || selret == 0) {

                        /* Select error, something is badly wrong */

                        perror("select");
                        exit(1);
                }

                /* Create a new connection if listen_sock readable */

                if (selret > 0) {

                        if (opt_dual_daemon) {
                                dual_select(&w_fds);
                        }

                        if (FD_ISSET(listen_sock, &r_fds)) {
                                while (winbindd_num_clients() > WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
                                        DEBUG(5,("winbindd: Exceeding %d client connections, removing idle connection.\n",
                                                WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
                                        if (!remove_idle_client()) {
                                                DEBUG(0,("winbindd: Exceeding %d client connections, no idle connection found\n",
                                                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
                                                break;
                                        }
                                }
                                /* new, non-privileged connection */
                                new_connection(listen_sock, False);
                        }
            
                        if (FD_ISSET(listen_priv_sock, &r_fds)) {
                                while (winbindd_num_clients() > WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
                                        DEBUG(5,("winbindd: Exceeding %d client connections, removing idle connection.\n",
                                                WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
                                        if (!remove_idle_client()) {
                                                DEBUG(0,("winbindd: Exceeding %d client connections, no idle connection found\n",
                                                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
                                                break;
                                        }
                                }
                                /* new, privileged connection */
                                new_connection(listen_priv_sock, True);
                        }
            
                        /* Process activity on client connections */
            
                        for (state = winbindd_client_list(); state; 
                             state = state->next) {
                
                                /* Data available for reading */
                
                                if (FD_ISSET(state->sock, &r_fds)) {
                    
                                        /* Read data */
                    
                                        winbind_client_read(state);

                                        /* 
                                         * If we have the start of a
                                         * packet, then check the
                                         * length field to make sure
                                         * the client's not talking
                                         * Mock Swedish.
                                         */

                                        if (state->read_buf_len >= sizeof(uint32)
                                            && *(uint32 *) &state->request != sizeof(state->request)) {
                                                DEBUG(0,("process_loop: Invalid request size from pid %d: %d bytes sent, should be %d\n",
                                                                state->request.pid, *(uint32 *) &state->request, sizeof(state->request)));

                                                remove_client(state);
                                                break;
                                        }

                                        /* A request packet might be 
                                           complete */
                    
                                        if (state->read_buf_len == 
                                            sizeof(state->request)) {
                                                winbind_process_packet(state);
                                        }
                                }
                
                                /* Data available for writing */
                
                                if (FD_ISSET(state->sock, &w_fds))
                                        client_write(state);
                        }
                }

#if 0
                winbindd_check_cache_size(time(NULL));
#endif

                /* Check signal handling things */

                if (do_sigterm)
                        terminate();

                if (do_sighup) {

                        DEBUG(3, ("got SIGHUP\n"));

                        msg_reload_services(MSG_SMB_CONF_UPDATED, (pid_t) 0, NULL, 0);
                        do_sighup = False;
                }

                if (do_sigusr2) {
                        print_winbindd_status();
                        do_sigusr2 = False;
                }
        }
}

/* Main function */

struct winbindd_state server_state;   /* Server state information */

int main(int argc, char **argv)
{
        pstring logfile;
        static BOOL interactive = False;
        static BOOL Fork = True;
        static BOOL log_stdout = False;
        struct poptOption long_options[] = {
                POPT_AUTOHELP
                { "stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
                { "foreground", 'F', POPT_ARG_VAL, &Fork, False, "Daemon in foreground mode" },
                { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
                { "single-daemon", 'Y', POPT_ARG_VAL, &opt_dual_daemon, False, "Single daemon mode" },
                { "no-caching", 'n', POPT_ARG_VAL, &opt_nocache, False, "Disable caching" },
                POPT_COMMON_SAMBA
                POPT_TABLEEND
        };
        poptContext pc;
        int opt;

        /* glibc (?) likes to print "User defined signal 1" and exit if a
           SIGUSR[12] is received before a handler is installed */

        CatchSignal(SIGUSR1, SIG_IGN);
        CatchSignal(SIGUSR2, SIG_IGN);

        fault_setup((void (*)(void *))fault_quit );

        /* Initialise for running in non-root mode */

        sec_init();

        set_remote_machine_name("winbindd", False);

        /* Set environment variable so we don't recursively call ourselves.
           This may also be useful interactively. */

        setenv(WINBINDD_DONT_ENV, "1", 1);

        /* Initialise samba/rpc client stuff */

        pc = poptGetContext("winbindd", argc, (const char **)argv, long_options,
                                                POPT_CONTEXT_KEEP_FIRST);

        while ((opt = poptGetNextOpt(pc)) != -1) {
                switch (opt) {
                        /* Don't become a daemon */
                case 'i':
                        interactive = True;
                        log_stdout = True;
                        Fork = False;
                        break;
                }
        }


        if (log_stdout && Fork) {
                printf("Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n");
                poptPrintUsage(pc, stderr, 0);
                exit(1);
        }

        snprintf(logfile, sizeof(logfile), "%s/log.winbindd", dyn_LOGFILEBASE);
        lp_set_logfile(logfile);
        setup_logging("winbindd", log_stdout);
        reopen_logs();

        DEBUG(1, ("winbindd version %s started.\n", VERSION ) );
        DEBUGADD( 1, ( "Copyright The Samba Team 2000-2003\n" ) );

        if (!reload_services_file(False)) {
                DEBUG(0, ("error opening config file\n"));
                exit(1);
        }

        /* Setup names. */

        if (!init_names())
                exit(1);

        load_interfaces();

        if (!secrets_init()) {

                DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
                return False;
        }

        /* Enable netbios namecache */

        namecache_enable();

        /* Check winbindd parameters are valid */

        ZERO_STRUCT(server_state);

        if (!winbindd_param_init())
                return 1;

        /* Winbind daemon initialisation */

        if (!winbindd_upgrade_idmap())
                return 1;

        if (!idmap_init(lp_idmap_backend()))
                return 1;

        if (!idmap_init_wellknown_sids())
                exit(1);

        /* Unblock all signals we are interested in as they may have been
           blocked by the parent process. */

        BlockSignals(False, SIGINT);
        BlockSignals(False, SIGQUIT);
        BlockSignals(False, SIGTERM);
        BlockSignals(False, SIGUSR1);
        BlockSignals(False, SIGUSR2);
        BlockSignals(False, SIGHUP);

        /* Setup signal handlers */
        
        CatchSignal(SIGINT, termination_handler);      /* Exit on these sigs */
        CatchSignal(SIGQUIT, termination_handler);
        CatchSignal(SIGTERM, termination_handler);

        CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */

        CatchSignal(SIGUSR2, sigusr2_handler);         /* Debugging sigs */
        CatchSignal(SIGHUP, sighup_handler);

        if (!interactive)
                become_daemon(Fork);

        pidfile_create("winbindd");

#if HAVE_SETPGID
        /*
         * If we're interactive we want to set our own process group for
         * signal management.
         */
        if (interactive)
                setpgid( (pid_t)0, (pid_t)0);
#endif

        if (opt_dual_daemon) {
                do_dual_daemon();
        }

        /* Initialise messaging system */

        if (!message_init()) {
                DEBUG(0, ("unable to initialise messaging system\n"));
                exit(1);
        }
        
        /* React on 'smbcontrol winbindd reload-config' in the same way
           as to SIGHUP signal */
        message_register(MSG_SMB_CONF_UPDATED, msg_reload_services);
        message_register(MSG_SHUTDOWN, msg_shutdown);
        
        poptFreeContext(pc);

        netsamlogon_cache_init(); /* Non-critical */
        
        /* Loop waiting for requests */

        process_loop();

        trustdom_cache_shutdown();

        return 0;
}