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