source/smbd/fake_file.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    FAKE FILE suppport, for faking up special files windows want access to
   4    Copyright (C) Stefan (metze) Metzmacher      2003
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21
  22 struct fake_file_type {
  23         const char *name;
  24         enum FAKE_FILE_TYPE type;
  25         void *(*init_pd)(TALLOC_CTX *mem_ctx);
  26 };
  27
  28 static struct fake_file_type fake_files[] = {
  29 #ifdef WITH_QUOTAS
  30         {FAKE_FILE_NAME_QUOTA_UNIX, FAKE_FILE_TYPE_QUOTA, init_quota_handle},
  31 #endif /* WITH_QUOTAS */
  32         {NULL, FAKE_FILE_TYPE_NONE, NULL}
  33 };
  34
  35 /****************************************************************************
  36  Create a fake file handle
  37 ****************************************************************************/
  38
  39 static struct fake_file_handle *init_fake_file_handle(enum FAKE_FILE_TYPE type)
  40 {
  41         struct fake_file_handle *fh = NULL;
  42         int i;
  43
  44         for (i=0; fake_files[i].name!=NULL; i++) {
  45                 if (fake_files[i].type==type) {
  46                         break;
  47                 }
  48         }
  49
  50         if (fake_files[i].name == NULL) {
  51                 return NULL;
  52         }
  53
  54         DEBUG(5,("init_fake_file_handle: for [%s]\n",fake_files[i].name));
  55
  56         fh = talloc(NULL, struct fake_file_handle);
  57         if (fh == NULL) {
  58                 DEBUG(0,("TALLOC_ZERO() failed.\n"));
  59                 return NULL;
  60         }
  61
  62         fh->type = type;
  63
  64         if (fake_files[i].init_pd) {
  65                 fh->private_data = fake_files[i].init_pd(fh);
  66         }
  67         return fh;
  68 }
  69
  70 /****************************************************************************
  71  Does this name match a fake filename ?
  72 ****************************************************************************/
  73
  74 enum FAKE_FILE_TYPE is_fake_file(const char *fname)
  75 {
  76 #ifdef HAVE_SYS_QUOTAS
  77         int i;
  78 #endif
  79
  80         if (!fname) {
  81                 return FAKE_FILE_TYPE_NONE;
  82         }
  83
  84 #ifdef HAVE_SYS_QUOTAS
  85         for (i=0;fake_files[i].name!=NULL;i++) {
  86                 if (strncmp(fname,fake_files[i].name,strlen(fake_files[i].name))==0) {
  87                         DEBUG(5,("is_fake_file: [%s] is a fake file\n",fname));
  88                         return fake_files[i].type;
  89                 }
  90         }
  91 #endif
  92
  93         return FAKE_FILE_TYPE_NONE;
  94 }
  95
  96
  97 /****************************************************************************
  98  Open a fake quota file with a share mode.
  99 ****************************************************************************/
 100
 101 NTSTATUS open_fake_file(connection_struct *conn,
 102                                 uint16_t current_vuid,
 103                                 enum FAKE_FILE_TYPE fake_file_type,
 104                                 const char *fname,
 105                                 uint32 access_mask,
 106                                 files_struct **result)
 107 {
 108         files_struct *fsp = NULL;
 109         NTSTATUS status;
 110
 111         /* access check */
 112         if (conn->server_info->utok.uid != 0) {
 113                 DEBUG(3, ("open_fake_file_shared: access_denied to "
 114                           "service[%s] file[%s] user[%s]\n",
 115                           lp_servicename(SNUM(conn)), fname,
 116                           conn->server_info->unix_name));
 117                 return NT_STATUS_ACCESS_DENIED;
 118
 119         }
 120
 121         status = file_new(conn, &fsp);
 122         if(!NT_STATUS_IS_OK(status)) {
 123                 return status;
 124         }
 125
 126         DEBUG(5,("open_fake_file_shared: fname = %s, FID = %d, access_mask = 0x%x\n",
 127                 fname, fsp->fnum, (unsigned int)access_mask));
 128
 129         fsp->conn = conn;
 130         fsp->fh->fd = -1;
 131         fsp->vuid = current_vuid;
 132         fsp->fh->pos = -1;
 133         fsp->can_lock = False; /* Should this be true ? - No, JRA */
 134         fsp->access_mask = access_mask;
 135         string_set(&fsp->fsp_name,fname);
 136
 137         fsp->fake_file_handle = init_fake_file_handle(fake_file_type);
 138
 139         if (fsp->fake_file_handle==NULL) {
 140                 file_free(fsp);
 141                 return NT_STATUS_NO_MEMORY;
 142         }
 143
 144         conn->num_files_open++;
 145         *result = fsp;
 146         return NT_STATUS_OK;
 147 }
 148
 149 void destroy_fake_file_handle(struct fake_file_handle **fh)
 150 {
 151         if (!fh) {
 152                 return;
 153         }
 154         TALLOC_FREE(*fh);
 155 }
 156
 157 NTSTATUS close_fake_file(files_struct *fsp)
 158 {
 159         file_free(fsp);
 160         return NT_STATUS_OK;
 161 }