source/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 2 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, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24 #include "lib/util/dlinklist.h"
  25 #include "smb_server/smb_server.h"
  26 #include "smbd/service_stream.h"
  27 #include "ntvfs/ntvfs.h"
  28
  29 struct socket_address *smbsrv_get_my_addr(void *p, TALLOC_CTX *mem_ctx)
  30 {
  31         struct smbsrv_connection *smb_conn = talloc_get_type(p,
  32                                              struct smbsrv_connection);
  33
  34         return socket_get_my_addr(smb_conn->connection->socket, mem_ctx);
  35 }
  36
  37 struct socket_address *smbsrv_get_peer_addr(void *p, TALLOC_CTX *mem_ctx)
  38 {
  39         struct smbsrv_connection *smb_conn = talloc_get_type(p,
  40                                              struct smbsrv_connection);
  41
  42         return socket_get_peer_addr(smb_conn->connection->socket, mem_ctx);
  43 }
  44
  45 /****************************************************************************
  46 init the tcon structures
  47 ****************************************************************************/
  48 static NTSTATUS smbsrv_init_tcons(struct smbsrv_tcons_context *tcons_ctx, TALLOC_CTX *mem_ctx, uint32_t limit)
  49 {
  50         /*
  51          * the idr_* functions take 'int' as limit,
  52          * and only work with a max limit 0x00FFFFFF
  53          */
  54         limit &= 0x00FFFFFF;
  55
  56         tcons_ctx->idtree_tid   = idr_init(mem_ctx);
  57         NT_STATUS_HAVE_NO_MEMORY(tcons_ctx->idtree_tid);
  58         tcons_ctx->idtree_limit = limit;
  59         tcons_ctx->list         = NULL;
  60
  61         return NT_STATUS_OK;
  62 }
  63
  64 NTSTATUS smbsrv_smb_init_tcons(struct smbsrv_connection *smb_conn)
  65 {
  66         return smbsrv_init_tcons(&smb_conn->smb_tcons, smb_conn, UINT16_MAX);
  67 }
  68
  69 NTSTATUS smbsrv_smb2_init_tcons(struct smbsrv_session *smb_sess)
  70 {
  71         return smbsrv_init_tcons(&smb_sess->smb2_tcons, smb_sess, UINT32_MAX);
  72 }
  73
  74 /****************************************************************************
  75 find a tcon given a tid for SMB
  76 ****************************************************************************/
  77 static struct smbsrv_tcon *smbsrv_tcon_find(struct smbsrv_tcons_context *tcons_ctx,
  78                                             uint32_t tid, struct timeval request_time)
  79 {
  80         void *p;
  81         struct smbsrv_tcon *tcon;
  82
  83         if (tid == 0) return NULL;
  84
  85         if (tid > tcons_ctx->idtree_limit) return NULL;
  86
  87         p = idr_find(tcons_ctx->idtree_tid, tid);
  88         if (!p) return NULL;
  89
  90         tcon = talloc_get_type(p, struct smbsrv_tcon);
  91         if (!tcon) return NULL;
  92
  93         tcon->statistics.last_request_time = request_time;
  94
  95         return tcon;
  96 }
  97
  98 struct smbsrv_tcon *smbsrv_smb_tcon_find(struct smbsrv_connection *smb_conn,
  99                                          uint32_t tid, struct timeval request_time)
 100 {
 101         return smbsrv_tcon_find(&smb_conn->smb_tcons, tid, request_time);
 102 }
 103
 104 struct smbsrv_tcon *smbsrv_smb2_tcon_find(struct smbsrv_session *smb_sess,
 105                                           uint32_t tid, struct timeval request_time)
 106 {
 107         if (!smb_sess) return NULL;
 108         return smbsrv_tcon_find(&smb_sess->smb2_tcons, tid, request_time);
 109 }
 110
 111 /*
 112   destroy a connection structure
 113 */
 114 static int smbsrv_tcon_destructor(struct smbsrv_tcon *tcon)
 115 {
 116         struct smbsrv_tcons_context *tcons_ctx;
 117         struct socket_address *client_addr;
 118
 119         client_addr = socket_get_peer_addr(tcon->smb_conn->connection->socket, tcon);
 120         DEBUG(3,("%s closed connection to service %s\n",
 121                  client_addr ? client_addr->addr : "(unknown)",
 122                  tcon->share_name));
 123
 124         /* tell the ntvfs backend that we are disconnecting */
 125         if (tcon->ntvfs) {
 126                 ntvfs_disconnect(tcon->ntvfs);
 127                 tcon->ntvfs = NULL;
 128         }
 129
 130         if (tcon->smb2.session) {
 131                 tcons_ctx = &tcon->smb2.session->smb2_tcons;
 132         } else {
 133                 tcons_ctx = &tcon->smb_conn->smb_tcons;
 134         }
 135
 136         idr_remove(tcons_ctx->idtree_tid, tcon->tid);
 137         DLIST_REMOVE(tcons_ctx->list, tcon);
 138         return 0;
 139 }
 140
 141 /*
 142   find first available connection slot
 143 */
 144 static struct smbsrv_tcon *smbsrv_tcon_new(struct smbsrv_connection *smb_conn,
 145                                            struct smbsrv_session *smb_sess,
 146                                            const char *share_name)
 147 {
 148         TALLOC_CTX *mem_ctx;
 149         struct smbsrv_tcons_context *tcons_ctx;
 150         struct smbsrv_tcon *tcon;
 151         NTSTATUS status;
 152         int i;
 153
 154         if (smb_sess) {
 155                 mem_ctx = smb_sess;
 156                 tcons_ctx = &smb_sess->smb2_tcons;
 157         } else {
 158                 mem_ctx = smb_conn;
 159                 tcons_ctx = &smb_conn->smb_tcons;
 160         }
 161
 162         tcon = talloc_zero(mem_ctx, struct smbsrv_tcon);
 163         if (!tcon) return NULL;
 164         tcon->smb_conn          = smb_conn;
 165         tcon->smb2.session      = smb_sess;
 166         tcon->share_name        = talloc_strdup(tcon, share_name);
 167         if (!tcon->share_name) goto failed;
 168
 169         /*
 170          * the use -1 here, because we don't want to give away the wildcard
 171          * fnum used in SMBflush
 172          */
 173         status = smbsrv_init_handles(tcon, UINT16_MAX - 1);
 174         if (!NT_STATUS_IS_OK(status)) {
 175                 DEBUG(1,("ERROR! failed to init handles: %s\n", nt_errstr(status)));
 176                 goto failed;
 177         }
 178
 179         i = idr_get_new_random(tcons_ctx->idtree_tid, tcon, tcons_ctx->idtree_limit);
 180         if (i == -1) {
 181                 DEBUG(1,("ERROR! Out of connection structures\n"));
 182                 goto failed;
 183         }
 184         tcon->tid = i;
 185
 186         DLIST_ADD(tcons_ctx->list, tcon);
 187         talloc_set_destructor(tcon, smbsrv_tcon_destructor);
 188
 189         /* now fill in some statistics */
 190         tcon->statistics.connect_time = timeval_current();
 191
 192         return tcon;
 193
 194 failed:
 195         talloc_free(tcon);
 196         return NULL;
 197 }
 198
 199 struct smbsrv_tcon *smbsrv_smb_tcon_new(struct smbsrv_connection *smb_conn, const char *share_name)
 200 {
 201         return smbsrv_tcon_new(smb_conn, NULL, share_name);
 202 }
 203
 204 struct smbsrv_tcon *smbsrv_smb2_tcon_new(struct smbsrv_session *smb_sess, const char *share_name)
 205 {
 206         return smbsrv_tcon_new(smb_sess->smb_conn, smb_sess, share_name);
 207 }