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
  85         if (client != NULL) {
  86                 sconn = client->sconn;
  87                 xconn = client->connections;
  88         }
  89
  90         if (!exit_firsttime)
  91                 exit(0);
  92         exit_firsttime = false;
  93
  94         change_to_root_user();
  95
  96
  97         /*
  98          * Here we typically have just one connection
  99          */
 100         for (; xconn != NULL; xconn = xconn->next) {
 101                 /*
 102                  * This is typically the disconnect for the only
 103                  * (or with multi-channel last) connection of the client
 104                  */
 105                 if (NT_STATUS_IS_OK(xconn->transport.status)) {
 106                         switch (how) {
 107                         case SERVER_EXIT_ABNORMAL:
 108                                 xconn->transport.status = NT_STATUS_INTERNAL_ERROR;
 109                                 break;
 110                         case SERVER_EXIT_NORMAL:
 111                                 xconn->transport.status = NT_STATUS_LOCAL_DISCONNECT;
 112                                 break;
 113                         }
 114                 }
 115                 DO_PROFILE_INC(disconnect);
 116         }
 117
 118         change_to_root_user();
 119
 120         if (sconn != NULL) {
 121                 if (lp_log_writeable_files_on_exit()) {
 122                         bool found = false;
 123                         files_forall(sconn, log_writeable_file_fn, &found);
 124                 }
 125         }
 126
 127         change_to_root_user();
 128
 129         if (client != NULL) {
 130                 NTSTATUS status;
 131
 132                 /*
 133                  * Note: this is a no-op for smb2 as
 134                  * conn->tcon_table is empty
 135                  */
 136                 status = smb1srv_tcon_disconnect_all(client);
 137                 if (!NT_STATUS_IS_OK(status)) {
 138                         DEBUG(0,("Server exit (%s)\n",
 139                                 (reason ? reason : "normal exit")));
 140                         DEBUG(0, ("exit_server_common: "
 141                                   "smb1srv_tcon_disconnect_all() failed (%s) - "
 142                                   "triggering cleanup\n", nt_errstr(status)));
 143                 }
 144
 145                 status = smbXsrv_session_logoff_all(client);
 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                                   "smbXsrv_session_logoff_all() failed (%s) - "
 151                                   "triggering cleanup\n", nt_errstr(status)));
 152                 }
 153         }
 154
 155         change_to_root_user();
 156
 157         if (client != NULL) {
 158                 struct smbXsrv_connection *xconn_next = NULL;
 159
 160                 for (xconn = client->connections;
 161                      xconn != NULL;
 162                      xconn = xconn_next) {
 163                         xconn_next = xconn->next;
 164                         DLIST_REMOVE(client->connections, xconn);
 165                         TALLOC_FREE(xconn);
 166                 }
 167         }
 168
 169         change_to_root_user();
 170
 171         /* 3 second timeout. */
 172         print_notify_send_messages(msg_ctx, 3);
 173
 174 #ifdef USE_DMAPI
 175         /* Destroy Samba DMAPI session only if we are master smbd process */
 176         if (am_parent) {
 177                 if (!dmapi_destroy_session()) {
 178                         DEBUG(0,("Unable to close Samba DMAPI session\n"));
 179                 }
 180         }
 181 #endif
 182
 183         if (am_parent && sconn != NULL) {
 184                 dcesrv_shutdown_registered_ep_servers(sconn->dce_ctx);
 185
 186                 global_dcesrv_context_free();
 187         }
 188
 189         /*
 190          * we need to force the order of freeing the following,
 191          * because smbd_msg_ctx is not a talloc child of smbd_server_conn.
 192          */
 193         if (client != NULL) {
 194                 TALLOC_FREE(client->sconn);
 195         }
 196         sconn = NULL;
 197         xconn = NULL;
 198         client = NULL;
 199         netlogon_creds_cli_close_global_db();
 200         TALLOC_FREE(global_smbXsrv_client);
 201         smbprofile_dump();
 202         global_messaging_context_free();
 203         global_event_context_free();
 204         TALLOC_FREE(smbd_memcache_ctx);
 205
 206         locking_end();
 207         printing_end();
 208
 209         if (how != SERVER_EXIT_NORMAL) {
 210
 211                 smb_panic(reason);
 212
 213                 /* Notreached. */
 214                 exit(1);
 215         } else {
 216                 DEBUG(3,("Server exit (%s)\n",
 217                         (reason ? reason : "normal exit")));
 218                 if (am_parent) {
 219                         pidfile_unlink(lp_pid_directory(), "smbd");
 220                 }
 221         }
 222
 223         exit(0);
 224 }
 225
 226 void smbd_exit_server(const char *const explanation)
 227 {
 228         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 229 }
 230
 231 void smbd_exit_server_cleanly(const char *const explanation)
 232 {
 233         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 234 }
 235
 236 /*
 237  * reinit_after_fork() wrapper that should be called when forking from
 238  * smbd.
 239  */
 240 NTSTATUS smbd_reinit_after_fork(struct messaging_context *msg_ctx,
 241                                 struct tevent_context *ev_ctx,
 242                                 bool parent_longlived, const char *comment)
 243 {
 244         NTSTATUS ret;
 245         am_parent = NULL;
 246         ret = reinit_after_fork(msg_ctx, ev_ctx, parent_longlived, comment);
 247         initialize_password_db(true, ev_ctx);
 248         return ret;
 249 }