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 "locking/share_mode_lock.h"
  27 #include "smbd/smbd.h"
  28 #include "smbd/globals.h"
  29 #include "ntdomain.h"
  30 #include "librpc/rpc/dcesrv_core.h"
  31 #include "printing/notify.h"
  32 #include "printing.h"
  33 #include "serverid.h"
  34 #include "messages.h"
  35 #include "passdb.h"
  36 #include "../lib/util/pidfile.h"
  37 #include "smbprofile.h"
  38 #include "libcli/auth/netlogon_creds_cli.h"
  39 #include "lib/gencache.h"
  40 #include "rpc_server/rpc_config.h"
  41 #include "lib/global_contexts.h"
  42
  43 static struct files_struct *log_writeable_file_fn(
  44         struct files_struct *fsp, void *private_data)
  45 {
  46         bool *found = (bool *)private_data;
  47         char *path;
  48
  49         if (!fsp->fsp_flags.can_write) {
  50                 return NULL;
  51         }
  52         if (!(*found)) {
  53                 DEBUG(0, ("Writable files open at exit:\n"));
  54                 *found = true;
  55         }
  56
  57         path = talloc_asprintf(talloc_tos(), "%s/%s", fsp->conn->connectpath,
  58                                smb_fname_str_dbg(fsp->fsp_name));
  59         if (path == NULL) {
  60                 DEBUGADD(0, ("<NOMEM>\n"));
  61         }
  62
  63         DEBUGADD(0, ("%s\n", path));
  64
  65         TALLOC_FREE(path);
  66         return NULL;
  67 }
  68
  69 /****************************************************************************
  70  Exit the server.
  71 ****************************************************************************/
  72
  73 /* Reasons for shutting down a server process. */
  74 enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
  75
  76 static void exit_server_common(enum server_exit_reason how,
  77         const char *reason) _NORETURN_;
  78
  79 static void exit_server_common(enum server_exit_reason how,
  80         const char *reason)
  81 {
  82         struct smbXsrv_client *client = global_smbXsrv_client;
  83         struct smbXsrv_connection *xconn = NULL;
  84         struct smbd_server_connection *sconn = NULL;
  85         NTSTATUS disconnect_status;
  86
  87         if (!exit_firsttime) {
  88                 exit(0);
  89         }
  90         exit_firsttime = false;
  91
  92         switch (how) {
  93         case SERVER_EXIT_NORMAL:
  94                 disconnect_status = NT_STATUS_LOCAL_DISCONNECT;
  95                 break;
  96         case SERVER_EXIT_ABNORMAL:
  97         default:
  98                 disconnect_status = NT_STATUS_INTERNAL_ERROR;
  99                 break;
 100         }
 101
 102         if (client != NULL) {
 103                 NTSTATUS status;
 104
 105                 sconn = client->sconn;
 106                 xconn = client->connections;
 107
 108                 /*
 109                  * Make sure we stop handling new multichannel
 110                  * connections early!
 111                  *
 112                  * From here, we're not able to handle them.
 113                  */
 114                 status = smbXsrv_client_remove(client);
 115                 if (!NT_STATUS_IS_OK(status)) {
 116                         D_ERR("Server exit (%s)\n",
 117                               (reason ? reason : "normal exit"));
 118                         DBG_ERR("smbXsrv_client_remove() failed (%s)\n",
 119                                 nt_errstr(status));
 120                 }
 121         }
 122
 123         change_to_root_user();
 124
 125
 126         /*
 127          * Here we typically have just one connection
 128          */
 129         for (; xconn != NULL; xconn = xconn->next) {
 130                 /*
 131                  * This is typically the disconnect for the only
 132                  * (or with multi-channel last) connection of the client.
 133                  *
 134                  * smbXsrv_connection_disconnect_transport() might be called already,
 135                  * but calling it again is a no-op.
 136                  */
 137                 smbXsrv_connection_disconnect_transport(xconn, disconnect_status);
 138         }
 139
 140         change_to_root_user();
 141
 142         if (sconn != NULL) {
 143                 if (lp_log_writeable_files_on_exit()) {
 144                         bool found = false;
 145                         files_forall(sconn, log_writeable_file_fn, &found);
 146                 }
 147         }
 148
 149         change_to_root_user();
 150
 151         if (client != NULL) {
 152                 NTSTATUS status;
 153
 154                 /*
 155                  * Note: this is a no-op for smb2 as
 156                  * conn->tcon_table is empty
 157                  */
 158                 status = smb1srv_tcon_disconnect_all(client);
 159                 if (!NT_STATUS_IS_OK(status)) {
 160                         DEBUG(0,("Server exit (%s)\n",
 161                                 (reason ? reason : "normal exit")));
 162                         DEBUG(0, ("exit_server_common: "
 163                                   "smb1srv_tcon_disconnect_all() failed (%s) - "
 164                                   "triggering cleanup\n", nt_errstr(status)));
 165                 }
 166
 167                 status = smbXsrv_session_logoff_all(client);
 168                 if (!NT_STATUS_IS_OK(status)) {
 169                         DEBUG(0,("Server exit (%s)\n",
 170                                 (reason ? reason : "normal exit")));
 171                         DEBUG(0, ("exit_server_common: "
 172                                   "smbXsrv_session_logoff_all() failed (%s) - "
 173                                   "triggering cleanup\n", nt_errstr(status)));
 174                 }
 175         }
 176
 177         change_to_root_user();
 178
 179         if (client != NULL) {
 180                 struct smbXsrv_connection *xconn_next = NULL;
 181
 182                 for (xconn = client->connections;
 183                      xconn != NULL;
 184                      xconn = xconn_next) {
 185                         xconn_next = xconn->next;
 186                         DLIST_REMOVE(client->connections, xconn);
 187                         TALLOC_FREE(xconn);
 188                 }
 189         }
 190
 191         change_to_root_user();
 192
 193 #ifdef USE_DMAPI
 194         /* Destroy Samba DMAPI session only if we are master smbd process */
 195         if (am_parent) {
 196                 if (!dmapi_destroy_session()) {
 197                         DEBUG(0,("Unable to close Samba DMAPI session\n"));
 198                 }
 199         }
 200 #endif
 201
 202
 203         /*
 204          * we need to force the order of freeing the following,
 205          * because smbd_msg_ctx is not a talloc child of smbd_server_conn.
 206          */
 207         if (client != NULL) {
 208                 TALLOC_FREE(client->sconn);
 209         }
 210         sconn = NULL;
 211         xconn = NULL;
 212         client = NULL;
 213         netlogon_creds_cli_close_global_db();
 214         TALLOC_FREE(global_smbXsrv_client);
 215         smbprofile_dump();
 216         global_messaging_context_free();
 217         global_event_context_free();
 218         TALLOC_FREE(smbd_memcache_ctx);
 219
 220         locking_end();
 221
 222         if (how != SERVER_EXIT_NORMAL) {
 223
 224                 smb_panic(reason);
 225
 226                 /* Notreached. */
 227                 exit(1);
 228         } else {
 229                 DEBUG(3,("Server exit (%s)\n",
 230                         (reason ? reason : "normal exit")));
 231                 if (am_parent) {
 232                         pidfile_unlink(lp_pid_directory(), "smbd");
 233                 }
 234         }
 235
 236         exit(0);
 237 }
 238
 239 void smbd_exit_server(const char *const explanation)
 240 {
 241         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 242 }
 243
 244 void smbd_exit_server_cleanly(const char *const explanation)
 245 {
 246         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 247 }
 248
 249 /*
 250  * reinit_after_fork() wrapper that should be called when forking from
 251  * smbd.
 252  */
 253 NTSTATUS smbd_reinit_after_fork(struct messaging_context *msg_ctx,
 254                                 struct tevent_context *ev_ctx,
 255                                 bool parent_longlived, const char *comment)
 256 {
 257         NTSTATUS ret;
 258         am_parent = NULL;
 259         ret = reinit_after_fork(msg_ctx, ev_ctx, parent_longlived, comment);
 260         initialize_password_db(true, ev_ctx);
 261         return ret;
 262 }