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/globals.h"
  27 #include "librpc/gen_ndr/messaging.h"
  28
  29 static struct files_struct *log_writeable_file_fn(
  30         struct files_struct *fsp, void *private_data)
  31 {
  32         bool *found = (bool *)private_data;
  33         char *path;
  34
  35         if (!fsp->can_write) {
  36                 return NULL;
  37         }
  38         if (!(*found)) {
  39                 DEBUG(0, ("Writable files open at exit:\n"));
  40                 *found = true;
  41         }
  42
  43         path = talloc_asprintf(talloc_tos(), "%s/%s", fsp->conn->connectpath,
  44                                smb_fname_str_dbg(fsp->fsp_name));
  45         if (path == NULL) {
  46                 DEBUGADD(0, ("<NOMEM>\n"));
  47         }
  48
  49         DEBUGADD(0, ("%s\n", path));
  50
  51         TALLOC_FREE(path);
  52         return NULL;
  53 }
  54
  55 /****************************************************************************
  56  Exit the server.
  57 ****************************************************************************/
  58
  59 /* Reasons for shutting down a server process. */
  60 enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
  61
  62 static void exit_server_common(enum server_exit_reason how,
  63         const char *const reason) _NORETURN_;
  64
  65 static void exit_server_common(enum server_exit_reason how,
  66         const char *const reason)
  67 {
  68         bool had_open_conn = false;
  69         struct smbd_server_connection *sconn = smbd_server_conn;
  70
  71         if (!exit_firsttime)
  72                 exit(0);
  73         exit_firsttime = false;
  74
  75         change_to_root_user();
  76
  77         if (sconn && sconn->smb1.negprot.auth_context) {
  78                 TALLOC_FREE(sconn->smb1.negprot.auth_context);
  79         }
  80
  81         if (sconn) {
  82                 if (lp_log_writeable_files_on_exit()) {
  83                         bool found = false;
  84                         files_forall(sconn, log_writeable_file_fn, &found);
  85                 }
  86                 had_open_conn = conn_close_all(sconn);
  87                 invalidate_all_vuids(sconn);
  88         }
  89
  90         /* 3 second timeout. */
  91         print_notify_send_messages(sconn->msg_ctx, 3);
  92
  93         /* delete our entry in the serverid database. */
  94         if (am_parent) {
  95                 /*
  96                  * For children the parent takes care of cleaning up
  97                  */
  98                 serverid_deregister(sconn_server_id(sconn));
  99         }
 100
 101 #ifdef WITH_DFS
 102         if (dcelogin_atmost_once) {
 103                 dfs_unlogin();
 104         }
 105 #endif
 106
 107 #ifdef USE_DMAPI
 108         /* Destroy Samba DMAPI session only if we are master smbd process */
 109         if (am_parent) {
 110                 if (!dmapi_destroy_session()) {
 111                         DEBUG(0,("Unable to close Samba DMAPI session\n"));
 112                 }
 113         }
 114 #endif
 115
 116         locking_end();
 117         printing_end();
 118
 119         /*
 120          * we need to force the order of freeing the following,
 121          * because smbd_msg_ctx is not a talloc child of smbd_server_conn.
 122          */
 123         sconn = NULL;
 124         TALLOC_FREE(smbd_server_conn);
 125         server_messaging_context_free();
 126         server_event_context_free();
 127         TALLOC_FREE(smbd_memcache_ctx);
 128
 129         if (how != SERVER_EXIT_NORMAL) {
 130                 DEBUGSEP(0);
 131                 DEBUG(0,("Abnormal server exit: %s\n",
 132                         reason ? reason : "no explanation provided"));
 133                 DEBUGSEP(0);
 134
 135                 log_stack_trace();
 136
 137                 dump_core();
 138
 139         } else {
 140                 DEBUG(3,("Server exit (%s)\n",
 141                         (reason ? reason : "normal exit")));
 142                 if (am_parent) {
 143                         pidfile_unlink();
 144                 }
 145                 gencache_stabilize();
 146         }
 147
 148         /* if we had any open SMB connections when we exited then we
 149            need to tell the parent smbd so that it can trigger a retry
 150            of any locks we may have been holding or open files we were
 151            blocking */
 152         if (had_open_conn) {
 153                 exit(1);
 154         } else {
 155                 exit(0);
 156         }
 157 }
 158
 159 void exit_server(const char *const explanation)
 160 {
 161         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 162 }
 163
 164 void exit_server_cleanly(const char *const explanation)
 165 {
 166         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 167 }
 168
 169 void exit_server_fault(void)
 170 {
 171         exit_server("critical server fault");
 172 }