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 "ntvfs/ntvfs.h"
  26
  27 struct socket_address *smbsrv_get_my_addr(void *p, TALLOC_CTX *mem_ctx)
  28 {
  29         struct smbsrv_connection *smb_conn = talloc_get_type(p,
  30                                              struct smbsrv_connection);
  31
  32         return socket_get_my_addr(smb_conn->connection->socket, mem_ctx);
  33 }
  34
  35 struct socket_address *smbsrv_get_peer_addr(void *p, TALLOC_CTX *mem_ctx)
  36 {
  37         struct smbsrv_connection *smb_conn = talloc_get_type(p,
  38                                              struct smbsrv_connection);
  39
  40         return socket_get_peer_addr(smb_conn->connection->socket, mem_ctx);
  41 }
  42
  43 /****************************************************************************
  44 init the tcon structures
  45 ****************************************************************************/
  46 static NTSTATUS smbsrv_init_tcons(struct smbsrv_tcons_context *tcons_ctx, TALLOC_CTX *mem_ctx, uint32_t limit)
  47 {
  48         /*
  49          * the idr_* functions take 'int' as limit,
  50          * and only work with a max limit 0x00FFFFFF
  51          */
  52         limit &= 0x00FFFFFF;
  53
  54         tcons_ctx->idtree_tid   = idr_init(mem_ctx);
  55         NT_STATUS_HAVE_NO_MEMORY(tcons_ctx->idtree_tid);
  56         tcons_ctx->idtree_limit = limit;
  57         tcons_ctx->list         = NULL;
  58
  59         return NT_STATUS_OK;
  60 }
  61
  62 NTSTATUS smbsrv_smb_init_tcons(struct smbsrv_connection *smb_conn)
  63 {
  64         return smbsrv_init_tcons(&smb_conn->smb_tcons, smb_conn, UINT16_MAX);
  65 }
  66
  67 NTSTATUS smbsrv_smb2_init_tcons(struct smbsrv_session *smb_sess)
  68 {
  69         return smbsrv_init_tcons(&smb_sess->smb2_tcons, smb_sess, UINT32_MAX);
  70 }
  71
  72 /****************************************************************************
  73 find a tcon given a tid for SMB
  74 ****************************************************************************/
  75 static struct smbsrv_tcon *smbsrv_tcon_find(struct smbsrv_tcons_context *tcons_ctx,
  76                                             uint32_t tid, struct timeval request_time)
  77 {
  78         void *p;
  79         struct smbsrv_tcon *tcon;
  80
  81         if (tid == 0) return NULL;
  82
  83         if (tid > tcons_ctx->idtree_limit) return NULL;
  84
  85         p = idr_find(tcons_ctx->idtree_tid, tid);
  86         if (!p) return NULL;
  87
  88         tcon = talloc_get_type(p, struct smbsrv_tcon);
  89         if (!tcon) return NULL;
  90
  91         tcon->statistics.last_request_time = request_time;
  92
  93         return tcon;
  94 }
  95
  96 struct smbsrv_tcon *smbsrv_smb_tcon_find(struct smbsrv_connection *smb_conn,
  97                                          uint32_t tid, struct timeval request_time)
  98 {
  99         return smbsrv_tcon_find(&smb_conn->smb_tcons, tid, request_time);
 100 }
 101
 102 struct smbsrv_tcon *smbsrv_smb2_tcon_find(struct smbsrv_session *smb_sess,
 103                                           uint32_t tid, struct timeval request_time)
 104 {
 105         if (!smb_sess) return NULL;
 106         return smbsrv_tcon_find(&smb_sess->smb2_tcons, tid, request_time);
 107 }
 108
 109 /*
 110   destroy a connection structure
 111 */
 112 static int smbsrv_tcon_destructor(struct smbsrv_tcon *tcon)
 113 {
 114         struct smbsrv_tcons_context *tcons_ctx;
 115         struct socket_address *client_addr;
 116
 117         client_addr = socket_get_peer_addr(tcon->smb_conn->connection->socket, tcon);
 118         DEBUG(3,("%s closed connection to service %s\n",
 119                  client_addr ? client_addr->addr : "(unknown)",
 120                  tcon->share_name));
 121
 122         /* tell the ntvfs backend that we are disconnecting */
 123         if (tcon->ntvfs) {
 124                 ntvfs_disconnect(tcon->ntvfs);
 125                 tcon->ntvfs = NULL;
 126         }
 127
 128         if (tcon->smb2.session) {
 129                 tcons_ctx = &tcon->smb2.session->smb2_tcons;
 130         } else {
 131                 tcons_ctx = &tcon->smb_conn->smb_tcons;
 132         }
 133
 134         idr_remove(tcons_ctx->idtree_tid, tcon->tid);
 135         DLIST_REMOVE(tcons_ctx->list, tcon);
 136         return 0;
 137 }
 138
 139 /*
 140   find first available connection slot
 141 */
 142 static struct smbsrv_tcon *smbsrv_tcon_new(struct smbsrv_connection *smb_conn,
 143                                            struct smbsrv_session *smb_sess,
 144                                            const char *share_name)
 145 {
 146         TALLOC_CTX *mem_ctx;
 147         struct smbsrv_tcons_context *tcons_ctx;
 148         uint32_t handle_uint_max;
 149         struct smbsrv_tcon *tcon;
 150         NTSTATUS status;
 151         int i;
 152
 153         if (smb_sess) {
 154                 mem_ctx = smb_sess;
 155                 tcons_ctx = &smb_sess->smb2_tcons;
 156                 handle_uint_max = UINT32_MAX;
 157         } else {
 158                 mem_ctx = smb_conn;
 159                 tcons_ctx = &smb_conn->smb_tcons;
 160                 handle_uint_max = UINT16_MAX;
 161         }
 162
 163         tcon = talloc_zero(mem_ctx, struct smbsrv_tcon);
 164         if (!tcon) return NULL;
 165         tcon->smb_conn          = smb_conn;
 166         tcon->smb2.session      = smb_sess;
 167         tcon->share_name        = talloc_strdup(tcon, share_name);
 168         if (!tcon->share_name) goto failed;
 169
 170         /*
 171          * the use -1 here, because we don't want to give away the wildcard
 172          * fnum used in SMBflush
 173          */
 174         status = smbsrv_init_handles(tcon, handle_uint_max - 1);
 175         if (!NT_STATUS_IS_OK(status)) {
 176                 DEBUG(1,("ERROR! failed to init handles: %s\n", nt_errstr(status)));
 177                 goto failed;
 178         }
 179
 180         i = idr_get_new_random(tcons_ctx->idtree_tid, tcon, tcons_ctx->idtree_limit);
 181         if (i == -1) {
 182                 DEBUG(1,("ERROR! Out of connection structures\n"));
 183                 goto failed;
 184         }
 185         tcon->tid = i;
 186
 187         DLIST_ADD(tcons_ctx->list, tcon);
 188         talloc_set_destructor(tcon, smbsrv_tcon_destructor);
 189
 190         /* now fill in some statistics */
 191         tcon->statistics.connect_time = timeval_current();
 192
 193         return tcon;
 194
 195 failed:
 196         talloc_free(tcon);
 197         return NULL;
 198 }
 199
 200 struct smbsrv_tcon *smbsrv_smb_tcon_new(struct smbsrv_connection *smb_conn, const char *share_name)
 201 {
 202         return smbsrv_tcon_new(smb_conn, NULL, share_name);
 203 }
 204
 205 struct smbsrv_tcon *smbsrv_smb2_tcon_new(struct smbsrv_session *smb_sess, const char *share_name)
 206 {
 207         return smbsrv_tcon_new(smb_sess->smb_conn, smb_sess, share_name);
 208 }