source3/modules/vfs_shadow_copy.c

   1 /*
   2  * implementation of an Shadow Copy module
   3  *
   4  * Copyright (C) Stefan Metzmacher      2003-2004
   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 /*
  24     Please read the VFS module Samba-HowTo-Collection.
  25     there's a chapter about this module
  26
  27     For this share
  28     Z:\
  29
  30     the ShadowCopies are in this directories
  31
  32     Z:\@GMT-2003.08.05-12.00.00\
  33     Z:\@GMT-2003.08.05-12.01.00\
  34     Z:\@GMT-2003.08.05-12.02.00\
  35
  36     e.g.
  37
  38     Z:\testfile.txt
  39     Z:\@GMT-2003.08.05-12.02.00\testfile.txt
  40
  41     or:
  42
  43     Z:\testdir\testfile.txt
  44     Z:\@GMT-2003.08.05-12.02.00\testdir\testfile.txt
  45
  46
  47     Note: Files must differ to be displayed via Windows Explorer!
  48           Directories are always displayed...
  49 */
  50
  51 static int vfs_shadow_copy_debug_level = DBGC_VFS;
  52
  53 #undef DBGC_CLASS
  54 #define DBGC_CLASS vfs_shadow_copy_debug_level
  55
  56 #define SHADOW_COPY_PREFIX "@GMT-"
  57 #define SHADOW_COPY_SAMPLE "@GMT-2004.02.18-15.44.00"
  58
  59 typedef struct {
  60         int pos;
  61         int num;
  62         SMB_STRUCT_DIRENT *dirs;
  63 } shadow_copy_Dir;
  64
  65 static BOOL shadow_copy_match_name(const char *name)
  66 {
  67         if (strncmp(SHADOW_COPY_PREFIX,name, sizeof(SHADOW_COPY_PREFIX)-1)==0 &&
  68                 (strlen(SHADOW_COPY_SAMPLE) == strlen(name))) {
  69                 return True;
  70         }
  71
  72         return False;
  73 }
  74
  75 static SMB_STRUCT_DIR *shadow_copy_opendir(vfs_handle_struct *handle, connection_struct *conn, const char *fname, const char *mask, uint32 attr)
  76 {
  77         shadow_copy_Dir *dirp;
  78         SMB_STRUCT_DIR *p = SMB_VFS_NEXT_OPENDIR(handle,conn,fname,mask,attr);
  79
  80         if (!p) {
  81                 DEBUG(0,("shadow_copy_opendir: SMB_VFS_NEXT_OPENDIR() failed for [%s]\n",fname));
  82                 return NULL;
  83         }
  84
  85         dirp = SMB_MALLOC_P(shadow_copy_Dir);
  86         if (!dirp) {
  87                 DEBUG(0,("shadow_copy_opendir: Out of memory\n"));
  88                 SMB_VFS_NEXT_CLOSEDIR(handle,conn,p);
  89                 return NULL;
  90         }
  91
  92         ZERO_STRUCTP(dirp);
  93
  94         while (True) {
  95                 SMB_STRUCT_DIRENT *d;
  96
  97                 d = SMB_VFS_NEXT_READDIR(handle, conn, p);
  98                 if (d == NULL) {
  99                         break;
 100                 }
 101
 102                 if (shadow_copy_match_name(d->d_name)) {
 103                         DEBUG(8,("shadow_copy_opendir: hide [%s]\n",d->d_name));
 104                         continue;
 105                 }
 106
 107                 DEBUG(10,("shadow_copy_opendir: not hide [%s]\n",d->d_name));
 108
 109                 dirp->dirs = SMB_REALLOC_ARRAY(dirp->dirs,SMB_STRUCT_DIRENT, dirp->num+1);
 110                 if (!dirp->dirs) {
 111                         DEBUG(0,("shadow_copy_opendir: Out of memory\n"));
 112                         break;
 113                 }
 114
 115                 dirp->dirs[dirp->num++] = *d;
 116         }
 117
 118         SMB_VFS_NEXT_CLOSEDIR(handle,conn,p);
 119         return((SMB_STRUCT_DIR *)dirp);
 120 }
 121
 122 SMB_STRUCT_DIRENT *shadow_copy_readdir(vfs_handle_struct *handle, connection_struct *conn, SMB_STRUCT_DIR *_dirp)
 123 {
 124         shadow_copy_Dir *dirp = (shadow_copy_Dir *)_dirp;
 125
 126         if (dirp->pos < dirp->num) {
 127                 return &(dirp->dirs[dirp->pos++]);
 128         }
 129
 130         return NULL;
 131 }
 132
 133 static void shadow_copy_seekdir(struct vfs_handle_struct *handle, struct connection_struct *conn, SMB_STRUCT_DIR *_dirp, long offset)
 134 {
 135         shadow_copy_Dir *dirp = (shadow_copy_Dir *)_dirp;
 136
 137         if (offset < dirp->num) {
 138                 dirp->pos = offset ;
 139         }
 140 }
 141
 142 static long shadow_copy_telldir(struct vfs_handle_struct *handle, struct connection_struct *conn, SMB_STRUCT_DIR *_dirp)
 143 {
 144         shadow_copy_Dir *dirp = (shadow_copy_Dir *)_dirp;
 145         return( dirp->pos ) ;
 146 }
 147
 148 static void shadow_copy_rewinddir(struct vfs_handle_struct *handle, struct connection_struct *conn, SMB_STRUCT_DIR *_dirp)
 149 {
 150         shadow_copy_Dir *dirp = (shadow_copy_Dir *)_dirp;
 151         dirp->pos = 0 ;
 152 }
 153
 154 int shadow_copy_closedir(vfs_handle_struct *handle, connection_struct *conn, SMB_STRUCT_DIR *_dirp)
 155 {
 156         shadow_copy_Dir *dirp = (shadow_copy_Dir *)_dirp;
 157
 158         SAFE_FREE(dirp->dirs);
 159         SAFE_FREE(dirp);
 160
 161         return 0;
 162 }
 163
 164 static int shadow_copy_get_shadow_copy_data(vfs_handle_struct *handle, files_struct *fsp, SHADOW_COPY_DATA *shadow_copy_data, BOOL labels)
 165 {
 166         SMB_STRUCT_DIR *p = SMB_VFS_NEXT_OPENDIR(handle,fsp->conn,fsp->conn->connectpath,NULL,0);
 167
 168         shadow_copy_data->num_volumes = 0;
 169         shadow_copy_data->labels = NULL;
 170
 171         if (!p) {
 172                 DEBUG(0,("shadow_copy_get_shadow_copy_data: SMB_VFS_NEXT_OPENDIR() failed for [%s]\n",fsp->conn->connectpath));
 173                 return -1;
 174         }
 175
 176         while (True) {
 177                 SHADOW_COPY_LABEL *tlabels;
 178                 SMB_STRUCT_DIRENT *d;
 179
 180                 d = SMB_VFS_NEXT_READDIR(handle, fsp->conn, p);
 181                 if (d == NULL) {
 182                         break;
 183                 }
 184
 185                 /* */
 186                 if (!shadow_copy_match_name(d->d_name)) {
 187                         DEBUG(10,("shadow_copy_get_shadow_copy_data: ignore [%s]\n",d->d_name));
 188                         continue;
 189                 }
 190
 191                 DEBUG(7,("shadow_copy_get_shadow_copy_data: not ignore [%s]\n",d->d_name));
 192
 193                 if (!labels) {
 194                         shadow_copy_data->num_volumes++;
 195                         continue;
 196                 }
 197
 198                 tlabels = (SHADOW_COPY_LABEL *)TALLOC_REALLOC(shadow_copy_data->mem_ctx,
 199                                                                         shadow_copy_data->labels,
 200                                                                         (shadow_copy_data->num_volumes+1)*sizeof(SHADOW_COPY_LABEL));
 201                 if (tlabels == NULL) {
 202                         DEBUG(0,("shadow_copy_get_shadow_copy_data: Out of memory\n"));
 203                         SMB_VFS_NEXT_CLOSEDIR(handle,fsp->conn,p);
 204                         return -1;
 205                 }
 206
 207                 snprintf(tlabels[shadow_copy_data->num_volumes++], sizeof(*tlabels), "%s",d->d_name);
 208
 209                 shadow_copy_data->labels = tlabels;
 210         }
 211
 212         SMB_VFS_NEXT_CLOSEDIR(handle,fsp->conn,p);
 213         return 0;
 214 }
 215
 216 /* VFS operations structure */
 217
 218 static vfs_op_tuple shadow_copy_ops[] = {
 219         {SMB_VFS_OP(shadow_copy_opendir),               SMB_VFS_OP_OPENDIR,             SMB_VFS_LAYER_TRANSPARENT},
 220         {SMB_VFS_OP(shadow_copy_readdir),               SMB_VFS_OP_READDIR,             SMB_VFS_LAYER_TRANSPARENT},
 221         {SMB_VFS_OP(shadow_copy_seekdir),               SMB_VFS_OP_SEEKDIR,             SMB_VFS_LAYER_TRANSPARENT},
 222         {SMB_VFS_OP(shadow_copy_telldir),               SMB_VFS_OP_TELLDIR,             SMB_VFS_LAYER_TRANSPARENT},
 223         {SMB_VFS_OP(shadow_copy_rewinddir),             SMB_VFS_OP_REWINDDIR,           SMB_VFS_LAYER_TRANSPARENT},
 224         {SMB_VFS_OP(shadow_copy_closedir),              SMB_VFS_OP_CLOSEDIR,            SMB_VFS_LAYER_TRANSPARENT},
 225
 226         {SMB_VFS_OP(shadow_copy_get_shadow_copy_data),  SMB_VFS_OP_GET_SHADOW_COPY_DATA,SMB_VFS_LAYER_OPAQUE},
 227
 228         {SMB_VFS_OP(NULL),                              SMB_VFS_OP_NOOP,                SMB_VFS_LAYER_NOOP}
 229 };
 230
 231 NTSTATUS vfs_shadow_copy_init(void)
 232 {
 233         NTSTATUS ret = smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "shadow_copy", shadow_copy_ops);
 234
 235         if (!NT_STATUS_IS_OK(ret))
 236                 return ret;
 237
 238         vfs_shadow_copy_debug_level = debug_add_class("shadow_copy");
 239         if (vfs_shadow_copy_debug_level == -1) {
 240                 vfs_shadow_copy_debug_level = DBGC_VFS;
 241                 DEBUG(0, ("%s: Couldn't register custom debugging class!\n",
 242                         "vfs_shadow_copy_init"));
 243         } else {
 244                 DEBUG(10, ("%s: Debug class number of '%s': %d\n",
 245                         "vfs_shadow_copy_init","shadow_copy",vfs_shadow_copy_debug_level));
 246         }
 247
 248         return ret;
 249 }