source4/smb_server/tcon.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Manage smbsrv_tcon structures
   4    Copyright (C) Andrew Tridgell 1998
   5    Copyright (C) Alexander Bokovoy 2002
   6    Copyright (C) Stefan Metzmacher 2005-2006
   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 "smb_server/smb_server.h"
  24 #include "samba/service_stream.h"
  25 #include "lib/tsocket/tsocket.h"
  26 #include "ntvfs/ntvfs.h"
  27 #include "lib/util/idtree_random.h"
  28
  29 /****************************************************************************
  30 init the tcon structures
  31 ****************************************************************************/
  32 static NTSTATUS smbsrv_init_tcons(struct smbsrv_tcons_context *tcons_ctx, TALLOC_CTX *mem_ctx, uint32_t limit)
  33 {
  34         /*
  35          * the idr_* functions take 'int' as limit,
  36          * and only work with a max limit 0x00FFFFFF
  37          */
  38         limit &= 0x00FFFFFF;
  39
  40         tcons_ctx->idtree_tid   = idr_init(mem_ctx);
  41         NT_STATUS_HAVE_NO_MEMORY(tcons_ctx->idtree_tid);
  42         tcons_ctx->idtree_limit = limit;
  43         tcons_ctx->list         = NULL;
  44
  45         return NT_STATUS_OK;
  46 }
  47
  48 NTSTATUS smbsrv_smb_init_tcons(struct smbsrv_connection *smb_conn)
  49 {
  50         return smbsrv_init_tcons(&smb_conn->smb_tcons, smb_conn, UINT16_MAX);
  51 }
  52
  53 NTSTATUS smbsrv_smb2_init_tcons(struct smbsrv_session *smb_sess)
  54 {
  55         return smbsrv_init_tcons(&smb_sess->smb2_tcons, smb_sess, UINT32_MAX);
  56 }
  57
  58 /****************************************************************************
  59 find a tcon given a tid for SMB
  60 ****************************************************************************/
  61 static struct smbsrv_tcon *smbsrv_tcon_find(struct smbsrv_tcons_context *tcons_ctx,
  62                                             uint32_t tid, struct timeval request_time)
  63 {
  64         void *p;
  65         struct smbsrv_tcon *tcon;
  66
  67         if (tid == 0) return NULL;
  68
  69         if (tid > tcons_ctx->idtree_limit) return NULL;
  70
  71         p = idr_find(tcons_ctx->idtree_tid, tid);
  72         if (!p) return NULL;
  73
  74         tcon = talloc_get_type(p, struct smbsrv_tcon);
  75         if (!tcon) return NULL;
  76
  77         tcon->statistics.last_request_time = request_time;
  78
  79         return tcon;
  80 }
  81
  82 struct smbsrv_tcon *smbsrv_smb_tcon_find(struct smbsrv_connection *smb_conn,
  83                                          uint32_t tid, struct timeval request_time)
  84 {
  85         return smbsrv_tcon_find(&smb_conn->smb_tcons, tid, request_time);
  86 }
  87
  88 struct smbsrv_tcon *smbsrv_smb2_tcon_find(struct smbsrv_session *smb_sess,
  89                                           uint32_t tid, struct timeval request_time)
  90 {
  91         if (!smb_sess) return NULL;
  92         return smbsrv_tcon_find(&smb_sess->smb2_tcons, tid, request_time);
  93 }
  94
  95 /*
  96   destroy a connection structure
  97 */
  98 static int smbsrv_tcon_destructor(struct smbsrv_tcon *tcon)
  99 {
 100         struct smbsrv_tcons_context *tcons_ctx;
 101         struct tsocket_address *client_addr;
 102
 103         client_addr = tcon->smb_conn->connection->remote_address;
 104
 105         DEBUG(3,("%s closed connection to service %s\n",
 106                  tsocket_address_string(client_addr, tcon),
 107                  tcon->share_name));
 108
 109         /* tell the ntvfs backend that we are disconnecting */
 110         if (tcon->ntvfs) {
 111                 ntvfs_disconnect(tcon->ntvfs);
 112                 tcon->ntvfs = NULL;
 113         }
 114
 115         if (tcon->smb2.session) {
 116                 tcons_ctx = &tcon->smb2.session->smb2_tcons;
 117         } else {
 118                 tcons_ctx = &tcon->smb_conn->smb_tcons;
 119         }
 120
 121         idr_remove(tcons_ctx->idtree_tid, tcon->tid);
 122         DLIST_REMOVE(tcons_ctx->list, tcon);
 123         return 0;
 124 }
 125
 126 /*
 127   find first available connection slot
 128 */
 129 static struct smbsrv_tcon *smbsrv_tcon_new(struct smbsrv_connection *smb_conn,
 130                                            struct smbsrv_session *smb_sess,
 131                                            const char *share_name)
 132 {
 133         TALLOC_CTX *mem_ctx;
 134         struct smbsrv_tcons_context *tcons_ctx;
 135         uint32_t handle_uint_max;
 136         struct smbsrv_tcon *tcon;
 137         NTSTATUS status;
 138         int i;
 139
 140         if (smb_sess) {
 141                 mem_ctx = smb_sess;
 142                 tcons_ctx = &smb_sess->smb2_tcons;
 143                 handle_uint_max = UINT32_MAX;
 144         } else {
 145                 mem_ctx = smb_conn;
 146                 tcons_ctx = &smb_conn->smb_tcons;
 147                 handle_uint_max = UINT16_MAX;
 148         }
 149
 150         tcon = talloc_zero(mem_ctx, struct smbsrv_tcon);
 151         if (!tcon) return NULL;
 152         tcon->smb_conn          = smb_conn;
 153         tcon->smb2.session      = smb_sess;
 154         tcon->share_name        = talloc_strdup(tcon, share_name);
 155         if (!tcon->share_name) goto failed;
 156
 157         /*
 158          * the use -1 here, because we don't want to give away the wildcard
 159          * fnum used in SMBflush
 160          */
 161         status = smbsrv_init_handles(tcon, handle_uint_max - 1);
 162         if (!NT_STATUS_IS_OK(status)) {
 163                 DEBUG(1,("ERROR! failed to init handles: %s\n", nt_errstr(status)));
 164                 goto failed;
 165         }
 166
 167         i = idr_get_new_random(
 168                 tcons_ctx->idtree_tid, tcon, 1, tcons_ctx->idtree_limit);
 169         if (i == -1) {
 170                 DEBUG(1,("ERROR! Out of connection structures\n"));
 171                 goto failed;
 172         }
 173         tcon->tid = i;
 174
 175         DLIST_ADD(tcons_ctx->list, tcon);
 176         talloc_set_destructor(tcon, smbsrv_tcon_destructor);
 177
 178         /* now fill in some statistics */
 179         tcon->statistics.connect_time = timeval_current();
 180
 181         return tcon;
 182
 183 failed:
 184         talloc_free(tcon);
 185         return NULL;
 186 }
 187
 188 struct smbsrv_tcon *smbsrv_smb_tcon_new(struct smbsrv_connection *smb_conn, const char *share_name)
 189 {
 190         return smbsrv_tcon_new(smb_conn, NULL, share_name);
 191 }
 192
 193 struct smbsrv_tcon *smbsrv_smb2_tcon_new(struct smbsrv_session *smb_sess, const char *share_name)
 194 {
 195         return smbsrv_tcon_new(smb_sess->smb_conn, smb_sess, share_name);
 196 }