Line data    Source code

       1             : /*
       2             :    Unix SMB/CIFS implementation.
       3             :    Manage connections_struct structures
       4             :    Copyright (C) Andrew Tridgell 1998
       5             :    Copyright (C) Alexander Bokovoy 2002
       6             :    Copyright (C) Jeremy Allison 2010
       7             : 
       8             :    This program is free software; you can redistribute it and/or modify
       9             :    it under the terms of the GNU General Public License as published by
      10             :    the Free Software Foundation; either version 3 of the License, or
      11             :    (at your option) any later version.
      12             : 
      13             :    This program is distributed in the hope that it will be useful,
      14             :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      15             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      16             :    GNU General Public License for more details.
      17             : 
      18             :    You should have received a copy of the GNU General Public License
      19             :    along with this program.  If not, see <http://www.gnu.org/licenses/>.
      20             : */
      21             : 
      22             : #include "includes.h"
      23             : #include "smbd/smbd.h"
      24             : #include "smbd/globals.h"
      25             : #include "lib/util/bitmap.h"
      26             : 
      27             : static void conn_free_internal(connection_struct *conn);
      28             : 
      29             : /****************************************************************************
      30             :  * Remove a conn struct from conn->sconn->connections
      31             :  * if not already done.
      32             : ****************************************************************************/
      33             : 
      34       56525 : static int conn_struct_destructor(connection_struct *conn)
      35             : {
      36       56525 :         if (conn->sconn != NULL) {
      37       56525 :                 DLIST_REMOVE(conn->sconn->connections, conn);
      38       56525 :                 SMB_ASSERT(conn->sconn->num_connections > 0);
      39       56525 :                 conn->sconn->num_connections--;
      40       56525 :                 conn->sconn = NULL;
      41             :         }
      42       56525 :         conn_free_internal(conn);
      43       56525 :         return 0;
      44             : }
      45             : 
      46             : /****************************************************************************
      47             :  Return the number of open connections.
      48             : ****************************************************************************/
      49             : 
      50        9483 : int conn_num_open(struct smbd_server_connection *sconn)
      51             : {
      52        9483 :         return sconn->num_connections;
      53             : }
      54             : 
      55             : /****************************************************************************
      56             :  Check if a snum is in use.
      57             : ****************************************************************************/
      58             : 
      59      105812 : bool conn_snum_used(struct smbd_server_connection *sconn,
      60             :                     int snum)
      61             : {
      62           0 :         struct connection_struct *conn;
      63             : 
      64      163470 :         for (conn=sconn->connections; conn; conn=conn->next) {
      65       58347 :                 if (conn->params->service == snum) {
      66         689 :                         return true;
      67             :                 }
      68             :         }
      69             : 
      70      105123 :         return false;
      71             : }
      72             : 
      73             : /****************************************************************************
      74             :  Find first available connection slot, starting from a random position.
      75             :  The randomisation stops problems with the server dying and clients
      76             :  thinking the server is still available.
      77             : ****************************************************************************/
      78             : 
      79       56551 : connection_struct *conn_new(struct smbd_server_connection *sconn)
      80             : {
      81       56551 :         connection_struct *conn = NULL;
      82             : 
      83       56551 :         conn = talloc_zero(NULL, connection_struct);
      84       56551 :         if (conn == NULL) {
      85           0 :                 DBG_ERR("talloc_zero failed\n");
      86           0 :                 return NULL;
      87             :         }
      88       56551 :         conn->params = talloc(conn, struct share_params);
      89       56551 :         if (conn->params == NULL) {
      90           0 :                 DBG_ERR("talloc_zero failed\n");
      91           0 :                 TALLOC_FREE(conn);
      92           0 :                 return NULL;
      93             :         }
      94       56551 :         conn->vuid_cache = talloc_zero(conn, struct vuid_cache);
      95       56551 :         if (conn->vuid_cache == NULL) {
      96           0 :                 DBG_ERR("talloc_zero failed\n");
      97           0 :                 TALLOC_FREE(conn);
      98           0 :                 return NULL;
      99             :         }
     100       56551 :         conn->connectpath = talloc_strdup(conn, "");
     101       56551 :         if (conn->connectpath == NULL) {
     102           0 :                 DBG_ERR("talloc_zero failed\n");
     103           0 :                 TALLOC_FREE(conn);
     104           0 :                 return NULL;
     105             :         }
     106       56551 :         conn->cwd_fsp = talloc_zero(conn, struct files_struct);
     107       56551 :         if (conn->cwd_fsp == NULL) {
     108           0 :                 DBG_ERR("talloc_zero failed\n");
     109           0 :                 TALLOC_FREE(conn);
     110           0 :                 return NULL;
     111             :         }
     112       56551 :         conn->cwd_fsp->fsp_name = synthetic_smb_fname(conn->cwd_fsp,
     113             :                                                       ".",
     114             :                                                       NULL,
     115             :                                                       NULL,
     116             :                                                       0,
     117             :                                                       0);
     118       56551 :         if (conn->cwd_fsp->fsp_name == NULL) {
     119           0 :                 TALLOC_FREE(conn);
     120           0 :                 return NULL;
     121             :         }
     122       56551 :         conn->cwd_fsp->fh = fd_handle_create(conn->cwd_fsp);
     123       56551 :         if (conn->cwd_fsp->fh == NULL) {
     124           0 :                 DBG_ERR("talloc_zero failed\n");
     125           0 :                 TALLOC_FREE(conn);
     126           0 :                 return NULL;
     127             :         }
     128       56551 :         conn->sconn = sconn;
     129       56551 :         conn->force_group_gid = (gid_t)-1;
     130       56551 :         fsp_set_fd(conn->cwd_fsp, -1);
     131       56551 :         conn->cwd_fsp->fnum = FNUM_FIELD_INVALID;
     132       56551 :         conn->cwd_fsp->conn = conn;
     133             : 
     134       56551 :         DLIST_ADD(sconn->connections, conn);
     135       56551 :         sconn->num_connections++;
     136             : 
     137             :         /*
     138             :          * Catches the case where someone forgets to call
     139             :          * conn_free().
     140             :          */
     141       56551 :         talloc_set_destructor(conn, conn_struct_destructor);
     142       56551 :         return conn;
     143             : }
     144             : 
     145             : /****************************************************************************
     146             :  Clear a vuid out of the connection's vuid cache
     147             : ****************************************************************************/
     148             : 
     149         276 : static void conn_clear_vuid_cache(connection_struct *conn, uint64_t vuid)
     150             : {
     151          34 :         int i;
     152             : 
     153        9108 :         for (i=0; i<VUID_CACHE_SIZE; i++) {
     154        1088 :                 struct vuid_cache_entry *ent;
     155             : 
     156        8832 :                 ent = &conn->vuid_cache->array[i];
     157             : 
     158        8832 :                 if (ent->vuid == vuid) {
     159         190 :                         ent->vuid = UID_FIELD_INVALID;
     160             :                         /*
     161             :                          * We need to keep conn->session_info around
     162             :                          * if it's equal to ent->session_info as a SMBulogoff
     163             :                          * is often followed by a SMBtdis (with an invalid
     164             :                          * vuid). The debug code (or regular code in
     165             :                          * vfs_full_audit) wants to refer to the
     166             :                          * conn->session_info pointer to print debug
     167             :                          * statements. Theoretically this is a bug,
     168             :                          * as once the vuid is gone the session_info
     169             :                          * on the conn struct isn't valid any more,
     170             :                          * but there's enough code that assumes
     171             :                          * conn->session_info is never null that
     172             :                          * it's easier to hold onto the old pointer
     173             :                          * until we get a new sessionsetupX.
     174             :                          * As everything is hung off the
     175             :                          * conn pointer as a talloc context we're not
     176             :                          * leaking memory here. See bug #6315. JRA.
     177             :                          */
     178         190 :                         if (conn->session_info == ent->session_info) {
     179         190 :                                 ent->session_info = NULL;
     180             :                         } else {
     181           0 :                                 TALLOC_FREE(ent->session_info);
     182             :                         }
     183         190 :                         ent->read_only = False;
     184         190 :                         ent->share_access = 0;
     185             :                 }
     186             :         }
     187         276 : }
     188             : 
     189             : /****************************************************************************
     190             :  Clear a vuid out of the validity cache, and as the 'owner' of a connection.
     191             : 
     192             :  Called from invalidate_vuid()
     193             : ****************************************************************************/
     194             : 
     195       29031 : void conn_clear_vuid_caches(struct smbd_server_connection *sconn, uint64_t vuid)
     196             : {
     197         782 :         connection_struct *conn;
     198             : 
     199       29307 :         for (conn=sconn->connections; conn;conn=conn->next) {
     200         276 :                 if (conn->vuid == vuid) {
     201         190 :                         conn->vuid = UID_FIELD_INVALID;
     202             :                 }
     203         276 :                 conn_clear_vuid_cache(conn, vuid);
     204             :         }
     205       29031 : }
     206             : 
     207             : /****************************************************************************
     208             :  Free a conn structure - internal part.
     209             : ****************************************************************************/
     210             : 
     211       56525 : static void conn_free_internal(connection_struct *conn)
     212             : {
     213       56525 :         vfs_handle_struct *handle = NULL, *thandle = NULL;
     214       56525 :         struct trans_state *state = NULL;
     215             : 
     216             :         /* Free vfs_connection_struct */
     217       56525 :         handle = conn->vfs_handles;
     218      420714 :         while(handle) {
     219      364189 :                 thandle = handle->next;
     220      364189 :                 DLIST_REMOVE(conn->vfs_handles, handle);
     221      364189 :                 if (handle->free_data)
     222       53594 :                         handle->free_data(&handle->data);
     223      359060 :                 handle = thandle;
     224             :         }
     225             : 
     226             :         /* Free any pending transactions stored on this conn. */
     227       56525 :         for (state = conn->pending_trans; state; state = state->next) {
     228             :                 /* state->setup is a talloc child of state. */
     229           0 :                 SAFE_FREE(state->param);
     230           0 :                 SAFE_FREE(state->data);
     231             :         }
     232             : 
     233       56525 :         free_namearray(conn->veto_list);
     234       56525 :         free_namearray(conn->hide_list);
     235       56525 :         free_namearray(conn->veto_oplock_list);
     236       56525 :         free_namearray(conn->aio_write_behind_list);
     237             : 
     238       56525 :         ZERO_STRUCTP(conn);
     239       56525 : }
     240             : 
     241             : /****************************************************************************
     242             :  Free a conn structure.
     243             : ****************************************************************************/
     244             : 
     245       56525 : void conn_free(connection_struct *conn)
     246             : {
     247       56525 :         TALLOC_FREE(conn);
     248       56525 : }
     249             : 
     250             : /*
     251             :  * Correctly initialize a share with case options.
     252             :  */
     253       56479 : void conn_setup_case_options(connection_struct *conn)
     254             : {
     255       56479 :         int snum = conn->params->service;
     256             : 
     257       56479 :         if (lp_case_sensitive(snum) == Auto) {
     258             :                 /* We will be setting this per packet. Set to be case
     259             :                 * insensitive for now. */
     260       56369 :                 conn->case_sensitive = false;
     261             :         } else {
     262         110 :                 conn->case_sensitive = (bool)lp_case_sensitive(snum);
     263             :         }
     264             : 
     265       56479 :         conn->case_preserve = lp_preserve_case(snum);
     266       56479 :         conn->short_case_preserve = lp_short_preserve_case(snum);
     267       56479 : }