source3/smbd/server_exit.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Main SMB server routines
   4    Copyright (C) Andrew Tridgell                1992-1998
   5    Copyright (C) Martin Pool                    2002
   6    Copyright (C) Jelmer Vernooij                2002-2003
   7    Copyright (C) Volker Lendecke                1993-2007
   8    Copyright (C) Jeremy Allison                 1993-2007
   9    Copyright (C) Andrew Bartlett                2010
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "smbd/smbd.h"
  27 #include "smbd/globals.h"
  28 #include "ntdomain.h"
  29 #include "../librpc/gen_ndr/srv_dfs.h"
  30 #include "../librpc/gen_ndr/srv_dssetup.h"
  31 #include "../librpc/gen_ndr/srv_echo.h"
  32 #include "../librpc/gen_ndr/srv_eventlog.h"
  33 #include "../librpc/gen_ndr/srv_initshutdown.h"
  34 #include "../librpc/gen_ndr/srv_lsa.h"
  35 #include "../librpc/gen_ndr/srv_netlogon.h"
  36 #include "../librpc/gen_ndr/srv_ntsvcs.h"
  37 #include "../librpc/gen_ndr/srv_samr.h"
  38 #include "../librpc/gen_ndr/srv_spoolss.h"
  39 #include "../librpc/gen_ndr/srv_srvsvc.h"
  40 #include "../librpc/gen_ndr/srv_svcctl.h"
  41 #include "../librpc/gen_ndr/srv_winreg.h"
  42 #include "../librpc/gen_ndr/srv_wkssvc.h"
  43 #include "printing/notify.h"
  44 #include "printing.h"
  45 #include "serverid.h"
  46 #include "messages.h"
  47 #include "../lib/util/pidfile.h"
  48 #include "smbprofile.h"
  49
  50 static struct files_struct *log_writeable_file_fn(
  51         struct files_struct *fsp, void *private_data)
  52 {
  53         bool *found = (bool *)private_data;
  54         char *path;
  55
  56         if (!fsp->can_write) {
  57                 return NULL;
  58         }
  59         if (!(*found)) {
  60                 DEBUG(0, ("Writable files open at exit:\n"));
  61                 *found = true;
  62         }
  63
  64         path = talloc_asprintf(talloc_tos(), "%s/%s", fsp->conn->connectpath,
  65                                smb_fname_str_dbg(fsp->fsp_name));
  66         if (path == NULL) {
  67                 DEBUGADD(0, ("<NOMEM>\n"));
  68         }
  69
  70         DEBUGADD(0, ("%s\n", path));
  71
  72         TALLOC_FREE(path);
  73         return NULL;
  74 }
  75
  76 /****************************************************************************
  77  Exit the server.
  78 ****************************************************************************/
  79
  80 /* Reasons for shutting down a server process. */
  81 enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
  82
  83 static void exit_server_common(enum server_exit_reason how,
  84         const char *reason) _NORETURN_;
  85
  86 static void exit_server_common(enum server_exit_reason how,
  87         const char *reason)
  88 {
  89         struct smbXsrv_client *client = global_smbXsrv_client;
  90         struct smbXsrv_connection *xconn = NULL;
  91         struct smbd_server_connection *sconn = NULL;
  92         struct messaging_context *msg_ctx = server_messaging_context();
  93
  94         if (client != NULL) {
  95                 sconn = client->sconn;
  96                 /*
  97                  * Here we typically have just one connection
  98                  */
  99                 xconn = client->connections;
 100         }
 101
 102         if (!exit_firsttime)
 103                 exit(0);
 104         exit_firsttime = false;
 105
 106         change_to_root_user();
 107
 108         if (xconn != NULL) {
 109                 /*
 110                  * This is typically the disconnect for the only
 111                  * (or with multi-channel last) connection of the client
 112                  */
 113                 if (NT_STATUS_IS_OK(xconn->transport.status)) {
 114                         switch (how) {
 115                         case SERVER_EXIT_ABNORMAL:
 116                                 xconn->transport.status = NT_STATUS_INTERNAL_ERROR;
 117                                 break;
 118                         case SERVER_EXIT_NORMAL:
 119                                 xconn->transport.status = NT_STATUS_LOCAL_DISCONNECT;
 120                                 break;
 121                         }
 122                 }
 123
 124                 TALLOC_FREE(xconn->smb1.negprot.auth_context);
 125         }
 126
 127         change_to_root_user();
 128
 129         if (sconn != NULL) {
 130                 if (lp_log_writeable_files_on_exit()) {
 131                         bool found = false;
 132                         files_forall(sconn, log_writeable_file_fn, &found);
 133                 }
 134         }
 135
 136         change_to_root_user();
 137
 138         if (xconn != NULL) {
 139                 NTSTATUS status;
 140
 141                 /*
 142                  * Note: this is a no-op for smb2 as
 143                  * conn->tcon_table is empty
 144                  */
 145                 status = smb1srv_tcon_disconnect_all(xconn);
 146                 if (!NT_STATUS_IS_OK(status)) {
 147                         DEBUG(0,("Server exit (%s)\n",
 148                                 (reason ? reason : "normal exit")));
 149                         DEBUG(0, ("exit_server_common: "
 150                                   "smb1srv_tcon_disconnect_all() failed (%s) - "
 151                                   "triggering cleanup\n", nt_errstr(status)));
 152                         how = SERVER_EXIT_ABNORMAL;
 153                         reason = "smb1srv_tcon_disconnect_all failed";
 154                 }
 155
 156                 status = smbXsrv_session_logoff_all(xconn);
 157                 if (!NT_STATUS_IS_OK(status)) {
 158                         DEBUG(0,("Server exit (%s)\n",
 159                                 (reason ? reason : "normal exit")));
 160                         DEBUG(0, ("exit_server_common: "
 161                                   "smbXsrv_session_logoff_all() failed (%s) - "
 162                                   "triggering cleanup\n", nt_errstr(status)));
 163                         how = SERVER_EXIT_ABNORMAL;
 164                         reason = "smbXsrv_session_logoff_all failed";
 165                 }
 166         }
 167
 168         change_to_root_user();
 169
 170         /* 3 second timeout. */
 171         print_notify_send_messages(msg_ctx, 3);
 172
 173         /* delete our entry in the serverid database. */
 174         if (am_parent) {
 175                 /*
 176                  * For children the parent takes care of cleaning up
 177                  */
 178                 serverid_deregister(messaging_server_id(msg_ctx));
 179         }
 180
 181 #ifdef WITH_DFS
 182         if (dcelogin_atmost_once) {
 183                 dfs_unlogin();
 184         }
 185 #endif
 186
 187 #ifdef USE_DMAPI
 188         /* Destroy Samba DMAPI session only if we are master smbd process */
 189         if (am_parent) {
 190                 if (!dmapi_destroy_session()) {
 191                         DEBUG(0,("Unable to close Samba DMAPI session\n"));
 192                 }
 193         }
 194 #endif
 195
 196         if (am_parent) {
 197                 rpc_wkssvc_shutdown();
 198                 rpc_dssetup_shutdown();
 199 #ifdef DEVELOPER
 200                 rpc_rpcecho_shutdown();
 201 #endif
 202                 rpc_netdfs_shutdown();
 203                 rpc_initshutdown_shutdown();
 204                 rpc_eventlog_shutdown();
 205                 rpc_ntsvcs_shutdown();
 206                 rpc_svcctl_shutdown();
 207                 rpc_spoolss_shutdown();
 208
 209                 rpc_srvsvc_shutdown();
 210                 rpc_winreg_shutdown();
 211
 212                 rpc_netlogon_shutdown();
 213                 rpc_samr_shutdown();
 214                 rpc_lsarpc_shutdown();
 215         }
 216
 217         /*
 218          * we need to force the order of freeing the following,
 219          * because smbd_msg_ctx is not a talloc child of smbd_server_conn.
 220          */
 221         if (client != NULL) {
 222                 struct smbXsrv_connection *next;
 223
 224                 for (; xconn != NULL; xconn = next) {
 225                         next = xconn->next;
 226                         DLIST_REMOVE(client->connections, xconn);
 227                         talloc_free(xconn);
 228                         DO_PROFILE_INC(disconnect);
 229                 }
 230                 TALLOC_FREE(client->sconn);
 231         }
 232         sconn = NULL;
 233         xconn = NULL;
 234         client = NULL;
 235         TALLOC_FREE(global_smbXsrv_client);
 236         smbprofile_dump();
 237         server_messaging_context_free();
 238         server_event_context_free();
 239         TALLOC_FREE(smbd_memcache_ctx);
 240
 241         locking_end();
 242         printing_end();
 243
 244         if (how != SERVER_EXIT_NORMAL) {
 245
 246                 smb_panic(reason);
 247
 248                 /* Notreached. */
 249                 exit(1);
 250         } else {
 251                 DEBUG(3,("Server exit (%s)\n",
 252                         (reason ? reason : "normal exit")));
 253                 if (am_parent) {
 254                         pidfile_unlink(lp_pid_directory(), "smbd");
 255                 }
 256                 gencache_stabilize();
 257         }
 258
 259         exit(0);
 260 }
 261
 262 void smbd_exit_server(const char *const explanation)
 263 {
 264         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 265 }
 266
 267 void smbd_exit_server_cleanly(const char *const explanation)
 268 {
 269         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 270 }
 271
 272 /*
 273  * reinit_after_fork() wrapper that should be called when forking from
 274  * smbd.
 275  */
 276 NTSTATUS smbd_reinit_after_fork(struct messaging_context *msg_ctx,
 277                                 struct tevent_context *ev_ctx,
 278                                 bool parent_longlived)
 279 {
 280         am_parent = NULL;
 281         return reinit_after_fork(msg_ctx, ev_ctx, parent_longlived);
 282 }