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 2 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, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22
  23 extern struct current_user current_user;
  24
  25 /****************************************************************************
  26  Open a file with a share mode.
  27 ****************************************************************************/
  28 files_struct *open_fake_file_shared1(enum FAKE_FILE_TYPE fake_file_type, connection_struct *conn,char *fname,
  29                                 SMB_STRUCT_STAT *psbuf,
  30                                 uint32 desired_access,
  31                                 int share_mode,int ofun, uint32 new_dos_attr, int oplock_request,
  32                                 int *Access,int *action)
  33 {
  34         int flags=0;
  35         files_struct *fsp = NULL;
  36
  37         if (fake_file_type == 0) {
  38                 return open_file_shared1(conn,fname,psbuf,desired_access,
  39                                         share_mode,ofun,new_dos_attr,
  40                                         oplock_request,Access,action);
  41         }
  42
  43         /* access check */
  44         if (current_user.uid != 0) {
  45                 DEBUG(1,("access_denied to service[%s] file[%s] user[%s]\n",
  46                         lp_servicename(SNUM(conn)),fname,conn->user));
  47                 errno = EACCES;
  48                 return NULL;
  49         }
  50
  51         fsp = file_new(conn);
  52         if(!fsp)
  53                 return NULL;
  54
  55         DEBUG(5,("open_fake_file_shared1: fname = %s, FID = %d, share_mode = %x, ofun = %x, oplock request = %d\n",
  56                 fname, fsp->fnum, share_mode, ofun, oplock_request ));
  57
  58         if (!check_name(fname,conn)) {
  59                 file_free(fsp);
  60                 return NULL;
  61         }
  62
  63         fsp->fd = -1;
  64         fsp->mode = psbuf->st_mode;
  65         fsp->inode = psbuf->st_ino;
  66         fsp->dev = psbuf->st_dev;
  67         fsp->vuid = current_user.vuid;
  68         fsp->size = psbuf->st_size;
  69         fsp->pos = -1;
  70         fsp->can_lock = True;
  71         fsp->can_read = ((flags & O_WRONLY)==0);
  72         fsp->can_write = ((flags & (O_WRONLY|O_RDWR))!=0);
  73         fsp->share_mode = 0;
  74         fsp->desired_access = desired_access;
  75         fsp->print_file = False;
  76         fsp->modified = False;
  77         fsp->oplock_type = NO_OPLOCK;
  78         fsp->sent_oplock_break = NO_BREAK_SENT;
  79         fsp->is_directory = False;
  80         fsp->is_stat = False;
  81         fsp->directory_delete_on_close = False;
  82         fsp->conn = conn;
  83         string_set(&fsp->fsp_name,fname);
  84         fsp->wcp = NULL; /* Write cache pointer. */
  85
  86         fsp->fake_file_handle = init_fake_file_handle(fake_file_type);
  87
  88         if (fsp->fake_file_handle==NULL) {
  89                 file_free(fsp);
  90                 return NULL;
  91         }
  92
  93         conn->num_files_open++;
  94         return fsp;
  95 }
  96
  97 static FAKE_FILE fake_files[] = {
  98 #ifdef WITH_QUOTAS
  99         {FAKE_FILE_NAME_QUOTA_UNIX,     FAKE_FILE_TYPE_QUOTA,   init_quota_handle,      destroy_quota_handle},
 100 #endif /* WITH_QUOTAS */
 101         {NULL,                          FAKE_FILE_TYPE_NONE,    NULL,                   NULL }
 102 };
 103
 104 int is_fake_file(char *fname)
 105 {
 106         int i;
 107
 108         if (!fname)
 109                 return 0;
 110
 111         for (i=0;fake_files[i].name!=NULL;i++) {
 112                 if (strncmp(fname,fake_files[i].name,strlen(fake_files[i].name))==0) {
 113                         DEBUG(5,("is_fake_file: [%s] is a fake file\n",fname));
 114                         return fake_files[i].type;
 115                 }
 116         }
 117
 118         return FAKE_FILE_TYPE_NONE;
 119 }
 120
 121 struct _FAKE_FILE_HANDLE *init_fake_file_handle(enum FAKE_FILE_TYPE type)
 122 {
 123         TALLOC_CTX *mem_ctx = NULL;
 124         FAKE_FILE_HANDLE *fh = NULL;
 125         int i;
 126
 127         for (i=0;fake_files[i].name!=NULL;i++) {
 128                 if (fake_files[i].type==type) {
 129                         DEBUG(5,("init_fake_file_handle: for [%s]\n",fake_files[i].name));
 130
 131                         if ((mem_ctx=talloc_init("fake_file_handle"))==NULL) {
 132                                 DEBUG(0,("talloc_init(fake_file_handle) failed.\n"));
 133                                 return NULL;
 134                         }
 135
 136                         if ((fh =TALLOC_ZERO_P(mem_ctx, FAKE_FILE_HANDLE))==NULL) {
 137                                 DEBUG(0,("talloc_zero() failed.\n"));
 138                                 talloc_destroy(mem_ctx);
 139                                 return NULL;
 140                         }
 141
 142                         fh->type = type;
 143                         fh->mem_ctx = mem_ctx;
 144
 145                         if (fake_files[i].init_pd)
 146                                 fh->pd = fake_files[i].init_pd(fh->mem_ctx);
 147
 148                         fh->free_pd = fake_files[i].free_pd;
 149
 150                         return fh;
 151                 }
 152         }
 153
 154         return NULL;
 155 }
 156
 157 void destroy_fake_file_handle(FAKE_FILE_HANDLE **fh)
 158 {
 159         if (!fh||!(*fh))
 160                 return;
 161
 162         if ((*fh)->free_pd)
 163                 (*fh)->free_pd(&(*fh)->pd);
 164
 165         talloc_destroy((*fh)->mem_ctx);
 166         (*fh) = NULL;
 167 }