source3/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 extern struct current_user current_user;
  23
  24 static FAKE_FILE fake_files[] = {
  25 #ifdef WITH_QUOTAS
  26         {FAKE_FILE_NAME_QUOTA_UNIX,     FAKE_FILE_TYPE_QUOTA,   init_quota_handle,      destroy_quota_handle},
  27 #endif /* WITH_QUOTAS */
  28         {NULL,                          FAKE_FILE_TYPE_NONE,    NULL,                   NULL }
  29 };
  30
  31 /****************************************************************************
  32  Create a fake file handle
  33 ****************************************************************************/
  34
  35 static struct _FAKE_FILE_HANDLE *init_fake_file_handle(enum FAKE_FILE_TYPE type)
  36 {
  37         TALLOC_CTX *mem_ctx = NULL;
  38         FAKE_FILE_HANDLE *fh = NULL;
  39         int i;
  40
  41         for (i=0;fake_files[i].name!=NULL;i++) {
  42                 if (fake_files[i].type==type) {
  43                         DEBUG(5,("init_fake_file_handle: for [%s]\n",fake_files[i].name));
  44
  45                         if ((mem_ctx=talloc_init("fake_file_handle"))==NULL) {
  46                                 DEBUG(0,("talloc_init(fake_file_handle) failed.\n"));
  47                                 return NULL;
  48                         }
  49
  50                         if ((fh =TALLOC_ZERO_P(mem_ctx, FAKE_FILE_HANDLE))==NULL) {
  51                                 DEBUG(0,("TALLOC_ZERO() failed.\n"));
  52                                 talloc_destroy(mem_ctx);
  53                                 return NULL;
  54                         }
  55
  56                         fh->type = type;
  57                         fh->mem_ctx = mem_ctx;
  58
  59                         if (fake_files[i].init_pd) {
  60                                 fh->pd = fake_files[i].init_pd(fh->mem_ctx);
  61                         }
  62
  63                         fh->free_pd = fake_files[i].free_pd;
  64
  65                         return fh;
  66                 }
  67         }
  68
  69         return NULL;
  70 }
  71
  72 /****************************************************************************
  73  Does this name match a fake filename ?
  74 ****************************************************************************/
  75
  76 enum FAKE_FILE_TYPE is_fake_file(const char *fname)
  77 {
  78 #ifdef HAVE_SYS_QUOTAS
  79         int i;
  80 #endif
  81
  82         if (!fname) {
  83                 return FAKE_FILE_TYPE_NONE;
  84         }
  85
  86 #ifdef HAVE_SYS_QUOTAS
  87         for (i=0;fake_files[i].name!=NULL;i++) {
  88                 if (strncmp(fname,fake_files[i].name,strlen(fake_files[i].name))==0) {
  89                         DEBUG(5,("is_fake_file: [%s] is a fake file\n",fname));
  90                         return fake_files[i].type;
  91                 }
  92         }
  93 #endif
  94
  95         return FAKE_FILE_TYPE_NONE;
  96 }
  97
  98
  99 /****************************************************************************
 100  Open a fake quota file with a share mode.
 101 ****************************************************************************/
 102
 103 NTSTATUS open_fake_file(connection_struct *conn,
 104                                 enum FAKE_FILE_TYPE fake_file_type,
 105                                 const char *fname,
 106                                 uint32 access_mask,
 107                                 files_struct **result)
 108 {
 109         files_struct *fsp = NULL;
 110         NTSTATUS status;
 111
 112         /* access check */
 113         if (current_user.ut.uid != 0) {
 114                 DEBUG(3, ("open_fake_file_shared: access_denied to "
 115                           "service[%s] file[%s] user[%s]\n",
 116                           lp_servicename(SNUM(conn)),fname,conn->user));
 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_user.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(FAKE_FILE_HANDLE **fh)
 150 {
 151         if (!fh||!(*fh)) {
 152                 return;
 153         }
 154
 155         if ((*fh)->free_pd) {
 156                 (*fh)->free_pd(&(*fh)->pd);
 157         }
 158
 159         talloc_destroy((*fh)->mem_ctx);
 160         (*fh) = NULL;
 161 }
 162
 163 NTSTATUS close_fake_file(files_struct *fsp)
 164 {
 165         file_free(fsp);
 166         return NT_STATUS_OK;
 167 }