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/rpc/dcesrv_core.h"
  30 #include "printing/notify.h"
  31 #include "printing.h"
  32 #include "serverid.h"
  33 #include "messages.h"
  34 #include "passdb.h"
  35 #include "../lib/util/pidfile.h"
  36 #include "smbprofile.h"
  37 #include "libcli/auth/netlogon_creds_cli.h"
  38 #include "lib/gencache.h"
  39 #include "rpc_server/rpc_config.h"
  40
  41 static struct files_struct *log_writeable_file_fn(
  42         struct files_struct *fsp, void *private_data)
  43 {
  44         bool *found = (bool *)private_data;
  45         char *path;
  46
  47         if (!fsp->fsp_flags.can_write) {
  48                 return NULL;
  49         }
  50         if (!(*found)) {
  51                 DEBUG(0, ("Writable files open at exit:\n"));
  52                 *found = true;
  53         }
  54
  55         path = talloc_asprintf(talloc_tos(), "%s/%s", fsp->conn->connectpath,
  56                                smb_fname_str_dbg(fsp->fsp_name));
  57         if (path == NULL) {
  58                 DEBUGADD(0, ("<NOMEM>\n"));
  59         }
  60
  61         DEBUGADD(0, ("%s\n", path));
  62
  63         TALLOC_FREE(path);
  64         return NULL;
  65 }
  66
  67 /****************************************************************************
  68  Exit the server.
  69 ****************************************************************************/
  70
  71 /* Reasons for shutting down a server process. */
  72 enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
  73
  74 static void exit_server_common(enum server_exit_reason how,
  75         const char *reason) _NORETURN_;
  76
  77 static void exit_server_common(enum server_exit_reason how,
  78         const char *reason)
  79 {
  80         struct smbXsrv_client *client = global_smbXsrv_client;
  81         struct smbXsrv_connection *xconn = NULL;
  82         struct smbd_server_connection *sconn = NULL;
  83         struct messaging_context *msg_ctx = global_messaging_context();
  84         NTSTATUS disconnect_status;
  85
  86         if (!exit_firsttime) {
  87                 exit(0);
  88         }
  89         exit_firsttime = false;
  90
  91         switch (how) {
  92         case SERVER_EXIT_NORMAL:
  93                 disconnect_status = NT_STATUS_LOCAL_DISCONNECT;
  94                 break;
  95         case SERVER_EXIT_ABNORMAL:
  96         default:
  97                 disconnect_status = NT_STATUS_INTERNAL_ERROR;
  98                 break;
  99         }
 100
 101         if (client != NULL) {
 102                 NTSTATUS status;
 103
 104                 sconn = client->sconn;
 105                 xconn = client->connections;
 106
 107                 /*
 108                  * Make sure we stop handling new multichannel
 109                  * connections early!
 110                  *
 111                  * From here, we're not able to handle them.
 112                  */
 113                 status = smbXsrv_client_remove(client);
 114                 if (!NT_STATUS_IS_OK(status)) {
 115                         D_ERR("Server exit (%s)\n",
 116                               (reason ? reason : "normal exit"));
 117                         DBG_ERR("smbXsrv_client_remove() failed (%s)\n",
 118                                 nt_errstr(status));
 119                 }
 120         }
 121
 122         change_to_root_user();
 123
 124
 125         /*
 126          * Here we typically have just one connection
 127          */
 128         for (; xconn != NULL; xconn = xconn->next) {
 129                 /*
 130                  * This is typically the disconnect for the only
 131                  * (or with multi-channel last) connection of the client.
 132                  *
 133                  * smbXsrv_connection_disconnect_transport() might be called already,
 134                  * but calling it again is a no-op.
 135                  */
 136                 smbXsrv_connection_disconnect_transport(xconn, disconnect_status);
 137         }
 138
 139         change_to_root_user();
 140
 141         if (sconn != NULL) {
 142                 if (lp_log_writeable_files_on_exit()) {
 143                         bool found = false;
 144                         files_forall(sconn, log_writeable_file_fn, &found);
 145                 }
 146         }
 147
 148         change_to_root_user();
 149
 150         if (client != NULL) {
 151                 NTSTATUS status;
 152
 153                 /*
 154                  * Note: this is a no-op for smb2 as
 155                  * conn->tcon_table is empty
 156                  */
 157                 status = smb1srv_tcon_disconnect_all(client);
 158                 if (!NT_STATUS_IS_OK(status)) {
 159                         DEBUG(0,("Server exit (%s)\n",
 160                                 (reason ? reason : "normal exit")));
 161                         DEBUG(0, ("exit_server_common: "
 162                                   "smb1srv_tcon_disconnect_all() failed (%s) - "
 163                                   "triggering cleanup\n", nt_errstr(status)));
 164                 }
 165
 166                 status = smbXsrv_session_logoff_all(client);
 167                 if (!NT_STATUS_IS_OK(status)) {
 168                         DEBUG(0,("Server exit (%s)\n",
 169                                 (reason ? reason : "normal exit")));
 170                         DEBUG(0, ("exit_server_common: "
 171                                   "smbXsrv_session_logoff_all() failed (%s) - "
 172                                   "triggering cleanup\n", nt_errstr(status)));
 173                 }
 174         }
 175
 176         change_to_root_user();
 177
 178         if (client != NULL) {
 179                 struct smbXsrv_connection *xconn_next = NULL;
 180
 181                 for (xconn = client->connections;
 182                      xconn != NULL;
 183                      xconn = xconn_next) {
 184                         xconn_next = xconn->next;
 185                         DLIST_REMOVE(client->connections, xconn);
 186                         TALLOC_FREE(xconn);
 187                 }
 188         }
 189
 190         change_to_root_user();
 191
 192         /* 3 second timeout. */
 193         print_notify_send_messages(msg_ctx, 3);
 194
 195 #ifdef USE_DMAPI
 196         /* Destroy Samba DMAPI session only if we are master smbd process */
 197         if (am_parent) {
 198                 if (!dmapi_destroy_session()) {
 199                         DEBUG(0,("Unable to close Samba DMAPI session\n"));
 200                 }
 201         }
 202 #endif
 203
 204         if (am_parent && sconn != NULL) {
 205                 dcesrv_shutdown_registered_ep_servers(sconn->dce_ctx);
 206
 207                 global_dcesrv_context_free();
 208         }
 209
 210         /*
 211          * we need to force the order of freeing the following,
 212          * because smbd_msg_ctx is not a talloc child of smbd_server_conn.
 213          */
 214         if (client != NULL) {
 215                 TALLOC_FREE(client->sconn);
 216         }
 217         sconn = NULL;
 218         xconn = NULL;
 219         client = NULL;
 220         netlogon_creds_cli_close_global_db();
 221         TALLOC_FREE(global_smbXsrv_client);
 222         smbprofile_dump();
 223         global_messaging_context_free();
 224         global_event_context_free();
 225         TALLOC_FREE(smbd_memcache_ctx);
 226
 227         locking_end();
 228         printing_end();
 229
 230         if (how != SERVER_EXIT_NORMAL) {
 231
 232                 smb_panic(reason);
 233
 234                 /* Notreached. */
 235                 exit(1);
 236         } else {
 237                 DEBUG(3,("Server exit (%s)\n",
 238                         (reason ? reason : "normal exit")));
 239                 if (am_parent) {
 240                         pidfile_unlink(lp_pid_directory(), "smbd");
 241                 }
 242         }
 243
 244         exit(0);
 245 }
 246
 247 void smbd_exit_server(const char *const explanation)
 248 {
 249         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 250 }
 251
 252 void smbd_exit_server_cleanly(const char *const explanation)
 253 {
 254         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 255 }
 256
 257 /*
 258  * reinit_after_fork() wrapper that should be called when forking from
 259  * smbd.
 260  */
 261 NTSTATUS smbd_reinit_after_fork(struct messaging_context *msg_ctx,
 262                                 struct tevent_context *ev_ctx,
 263                                 bool parent_longlived, const char *comment)
 264 {
 265         NTSTATUS ret;
 266         am_parent = NULL;
 267         ret = reinit_after_fork(msg_ctx, ev_ctx, parent_longlived, comment);
 268         initialize_password_db(true, ev_ctx);
 269         return ret;
 270 }