source/modules/vfs_netatalk.c

   1 /*
   2  * AppleTalk VFS module for Samba-3.x
   3  *
   4  * Copyright (C) Alexei Kotovich, 2002
   5  * Copyright (C) Stefan (metze) Metzmacher, 2003
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include "includes.h"
  23
  24 #undef DBGC_CLASS
  25 #define DBGC_CLASS DBGC_VFS
  26
  27 #define APPLEDOUBLE     ".AppleDouble"
  28 #define ADOUBLEMODE     0777
  29
  30 /* atalk functions */
  31
  32 static int atalk_build_paths(TALLOC_CTX *ctx, const char *path,
  33   const char *fname, char **adbl_path, char **orig_path,
  34   SMB_STRUCT_STAT *adbl_info, SMB_STRUCT_STAT *orig_info);
  35
  36 static int atalk_unlink_file(const char *path);
  37
  38 static int atalk_get_path_ptr(char *path)
  39 {
  40         int i   = 0;
  41         int ptr = 0;
  42
  43         for (i = 0; path[i]; i ++) {
  44                 if (path[i] == '/')
  45                         ptr = i;
  46                 /* get out some 'spam';) from win32's file name */
  47                 else if (path[i] == ':') {
  48                         path[i] = '\0';
  49                         break;
  50                 }
  51         }
  52
  53         return ptr;
  54 }
  55
  56 static int atalk_build_paths(TALLOC_CTX *ctx, const char *path, const char *fname,
  57                               char **adbl_path, char **orig_path,
  58                               SMB_STRUCT_STAT *adbl_info, SMB_STRUCT_STAT *orig_info)
  59 {
  60         int ptr0 = 0;
  61         int ptr1 = 0;
  62         char *dname = 0;
  63         char *name  = 0;
  64
  65         if (!ctx || !path || !fname || !adbl_path || !orig_path ||
  66                 !adbl_info || !orig_info)
  67                 return -1;
  68 #if 0
  69         DEBUG(3, ("ATALK: PATH: %s[%s]\n", path, fname));
  70 #endif
  71         if (strstr(path, APPLEDOUBLE) || strstr(fname, APPLEDOUBLE)) {
  72                 DEBUG(3, ("ATALK: path %s[%s] already contains %s\n", path, fname, APPLEDOUBLE));
  73                 return -1;
  74         }
  75
  76         if (fname[0] == '.') ptr0 ++;
  77         if (fname[1] == '/') ptr0 ++;
  78
  79         *orig_path = talloc_asprintf(ctx, "%s/%s", path, &fname[ptr0]);
  80
  81         /* get pointer to last '/' */
  82         ptr1 = atalk_get_path_ptr(*orig_path);
  83
  84         sys_lstat(*orig_path, orig_info);
  85
  86         if (S_ISDIR(orig_info->st_mode)) {
  87                 *adbl_path = talloc_asprintf(ctx, "%s/%s/%s/",
  88                   path, &fname[ptr0], APPLEDOUBLE);
  89         } else {
  90                 dname = talloc_strdup(ctx, *orig_path);
  91                 dname[ptr1] = '\0';
  92                 name = *orig_path;
  93                 *adbl_path = talloc_asprintf(ctx, "%s/%s/%s",
  94                   dname, APPLEDOUBLE, &name[ptr1 + 1]);
  95         }
  96 #if 0
  97         DEBUG(3, ("ATALK: DEBUG:\n%s\n%s\n", *orig_path, *adbl_path));
  98 #endif
  99         sys_lstat(*adbl_path, adbl_info);
 100         return 0;
 101 }
 102
 103 static int atalk_unlink_file(const char *path)
 104 {
 105         int ret = 0;
 106
 107         become_root();
 108         ret = unlink(path);
 109         unbecome_root();
 110
 111         return ret;
 112 }
 113
 114 static void atalk_add_to_list(name_compare_entry **list)
 115 {
 116         int i, count = 0;
 117         name_compare_entry *new_list = 0;
 118         name_compare_entry *cur_list = 0;
 119
 120         cur_list = *list;
 121
 122         if (cur_list) {
 123                 for (i = 0, count = 0; cur_list[i].name; i ++, count ++) {
 124                         if (strstr(cur_list[i].name, APPLEDOUBLE))
 125                                 return;
 126                 }
 127         }
 128
 129         if (!(new_list = SMB_CALLOC_ARRAY(name_compare_entry, (count == 0 ? 1 : count + 1))))
 130                 return;
 131
 132         for (i = 0; i < count; i ++) {
 133                 new_list[i].name    = SMB_STRDUP(cur_list[i].name);
 134                 new_list[i].is_wild = cur_list[i].is_wild;
 135         }
 136
 137         new_list[i].name    = SMB_STRDUP(APPLEDOUBLE);
 138         new_list[i].is_wild = False;
 139
 140         free_namearray(*list);
 141
 142         *list = new_list;
 143         new_list = 0;
 144         cur_list = 0;
 145 }
 146
 147 static void atalk_rrmdir(TALLOC_CTX *ctx, char *path)
 148 {
 149         char *dpath;
 150         SMB_STRUCT_DIRENT *dent = 0;
 151         SMB_STRUCT_DIR *dir;
 152
 153         if (!path) return;
 154
 155         dir = sys_opendir(path);
 156         if (!dir) return;
 157
 158         while (NULL != (dent = sys_readdir(dir))) {
 159                 if (strcmp(dent->d_name, ".") == 0 ||
 160                     strcmp(dent->d_name, "..") == 0)
 161                         continue;
 162                 if (!(dpath = talloc_asprintf(ctx, "%s/%s",
 163                                               path, dent->d_name)))
 164                         continue;
 165                 atalk_unlink_file(dpath);
 166         }
 167
 168         sys_closedir(dir);
 169 }
 170
 171 /* Disk operations */
 172
 173 /* Directory operations */
 174
 175 static SMB_STRUCT_DIR *atalk_opendir(struct vfs_handle_struct *handle, const char *fname, const char *mask, uint32 attr)
 176 {
 177         SMB_STRUCT_DIR *ret = 0;
 178
 179         ret = SMB_VFS_NEXT_OPENDIR(handle, fname, mask, attr);
 180
 181         /*
 182          * when we try to perform delete operation upon file which has fork
 183          * in ./.AppleDouble and this directory wasn't hidden by Samba,
 184          * MS Windows explorer causes the error: "Cannot find the specified file"
 185          * There is some workaround to avoid this situation, i.e. if
 186          * connection has not .AppleDouble entry in either veto or hide
 187          * list then it would be nice to add one.
 188          */
 189
 190         atalk_add_to_list(&handle->conn->hide_list);
 191         atalk_add_to_list(&handle->conn->veto_list);
 192
 193         return ret;
 194 }
 195
 196 static int atalk_rmdir(struct vfs_handle_struct *handle, const char *path)
 197 {
 198         BOOL add = False;
 199         TALLOC_CTX *ctx = 0;
 200         char *dpath;
 201
 202         if (!handle->conn->origpath || !path) goto exit_rmdir;
 203
 204         /* due to there is no way to change bDeleteVetoFiles variable
 205          * from this module, gotta use talloc stuff..
 206          */
 207
 208         strstr(path, APPLEDOUBLE) ? (add = False) : (add = True);
 209
 210         if (!(ctx = talloc_init("remove_directory")))
 211                 goto exit_rmdir;
 212
 213         if (!(dpath = talloc_asprintf(ctx, "%s/%s%s",
 214           handle->conn->origpath, path, add ? "/"APPLEDOUBLE : "")))
 215                 goto exit_rmdir;
 216
 217         atalk_rrmdir(ctx, dpath);
 218
 219 exit_rmdir:
 220         talloc_destroy(ctx);
 221         return SMB_VFS_NEXT_RMDIR(handle, path);
 222 }
 223
 224 /* File operations */
 225
 226 static int atalk_rename(struct vfs_handle_struct *handle, const char *oldname, const char *newname)
 227 {
 228         int ret = 0;
 229         char *adbl_path = 0;
 230         char *orig_path = 0;
 231         SMB_STRUCT_STAT adbl_info;
 232         SMB_STRUCT_STAT orig_info;
 233         TALLOC_CTX *ctx;
 234
 235         ret = SMB_VFS_NEXT_RENAME(handle, oldname, newname);
 236
 237         if (!oldname) return ret;
 238
 239         if (!(ctx = talloc_init("rename_file")))
 240                 return ret;
 241
 242         if (atalk_build_paths(ctx, handle->conn->origpath, oldname, &adbl_path, &orig_path,
 243           &adbl_info, &orig_info) != 0)
 244                 goto exit_rename;
 245
 246         if (S_ISDIR(orig_info.st_mode) || S_ISREG(orig_info.st_mode)) {
 247                 DEBUG(3, ("ATALK: %s has passed..\n", adbl_path));
 248                 goto exit_rename;
 249         }
 250
 251         atalk_unlink_file(adbl_path);
 252
 253 exit_rename:
 254         talloc_destroy(ctx);
 255         return ret;
 256 }
 257
 258 static int atalk_unlink(struct vfs_handle_struct *handle, const char *path)
 259 {
 260         int ret = 0, i;
 261         char *adbl_path = 0;
 262         char *orig_path = 0;
 263         SMB_STRUCT_STAT adbl_info;
 264         SMB_STRUCT_STAT orig_info;
 265         TALLOC_CTX *ctx;
 266
 267         ret = SMB_VFS_NEXT_UNLINK(handle, path);
 268
 269         if (!path) return ret;
 270
 271         /* no .AppleDouble sync if veto or hide list is empty,
 272          * otherwise "Cannot find the specified file" error will be caused
 273          */
 274
 275         if (!handle->conn->veto_list) return ret;
 276         if (!handle->conn->hide_list) return ret;
 277
 278         for (i = 0; handle->conn->veto_list[i].name; i ++) {
 279                 if (strstr(handle->conn->veto_list[i].name, APPLEDOUBLE))
 280                         break;
 281         }
 282
 283         if (!handle->conn->veto_list[i].name) {
 284                 for (i = 0; handle->conn->hide_list[i].name; i ++) {
 285                         if (strstr(handle->conn->hide_list[i].name, APPLEDOUBLE))
 286                                 break;
 287                         else {
 288                                 DEBUG(3, ("ATALK: %s is not hidden, skipped..\n",
 289                                   APPLEDOUBLE));
 290                                 return ret;
 291                         }
 292                 }
 293         }
 294
 295         if (!(ctx = talloc_init("unlink_file")))
 296                 return ret;
 297
 298         if (atalk_build_paths(ctx, handle->conn->origpath, path, &adbl_path, &orig_path,
 299           &adbl_info, &orig_info) != 0)
 300                 goto exit_unlink;
 301
 302         if (S_ISDIR(orig_info.st_mode) || S_ISREG(orig_info.st_mode)) {
 303                 DEBUG(3, ("ATALK: %s has passed..\n", adbl_path));
 304                 goto exit_unlink;
 305         }
 306
 307         atalk_unlink_file(adbl_path);
 308
 309 exit_unlink:
 310         talloc_destroy(ctx);
 311         return ret;
 312 }
 313
 314 static int atalk_chmod(struct vfs_handle_struct *handle, const char *path, mode_t mode)
 315 {
 316         int ret = 0;
 317         char *adbl_path = 0;
 318         char *orig_path = 0;
 319         SMB_STRUCT_STAT adbl_info;
 320         SMB_STRUCT_STAT orig_info;
 321         TALLOC_CTX *ctx;
 322
 323         ret = SMB_VFS_NEXT_CHMOD(handle, path, mode);
 324
 325         if (!path) return ret;
 326
 327         if (!(ctx = talloc_init("chmod_file")))
 328                 return ret;
 329
 330         if (atalk_build_paths(ctx, handle->conn->origpath, path, &adbl_path, &orig_path,
 331           &adbl_info, &orig_info) != 0)
 332                 goto exit_chmod;
 333
 334         if (!S_ISDIR(orig_info.st_mode) && !S_ISREG(orig_info.st_mode)) {
 335                 DEBUG(3, ("ATALK: %s has passed..\n", orig_path));
 336                 goto exit_chmod;
 337         }
 338
 339         chmod(adbl_path, ADOUBLEMODE);
 340
 341 exit_chmod:
 342         talloc_destroy(ctx);
 343         return ret;
 344 }
 345
 346 static int atalk_chown(struct vfs_handle_struct *handle, const char *path, uid_t uid, gid_t gid)
 347 {
 348         int ret = 0;
 349         char *adbl_path = 0;
 350         char *orig_path = 0;
 351         SMB_STRUCT_STAT adbl_info;
 352         SMB_STRUCT_STAT orig_info;
 353         TALLOC_CTX *ctx;
 354
 355         ret = SMB_VFS_NEXT_CHOWN(handle, path, uid, gid);
 356
 357         if (!path) return ret;
 358
 359         if (!(ctx = talloc_init("chown_file")))
 360                 return ret;
 361
 362         if (atalk_build_paths(ctx, handle->conn->origpath, path, &adbl_path, &orig_path,
 363           &adbl_info, &orig_info) != 0)
 364                 goto exit_chown;
 365
 366         if (!S_ISDIR(orig_info.st_mode) && !S_ISREG(orig_info.st_mode)) {
 367                 DEBUG(3, ("ATALK: %s has passed..\n", orig_path));
 368                 goto exit_chown;
 369         }
 370
 371         chown(adbl_path, uid, gid);
 372
 373 exit_chown:
 374         talloc_destroy(ctx);
 375         return ret;
 376 }
 377
 378 static vfs_op_tuple atalk_ops[] = {
 379
 380         /* Directory operations */
 381
 382         {SMB_VFS_OP(atalk_opendir),             SMB_VFS_OP_OPENDIR,     SMB_VFS_LAYER_TRANSPARENT},
 383         {SMB_VFS_OP(atalk_rmdir),               SMB_VFS_OP_RMDIR,       SMB_VFS_LAYER_TRANSPARENT},
 384
 385         /* File operations */
 386
 387         {SMB_VFS_OP(atalk_rename),              SMB_VFS_OP_RENAME,      SMB_VFS_LAYER_TRANSPARENT},
 388         {SMB_VFS_OP(atalk_unlink),              SMB_VFS_OP_UNLINK,      SMB_VFS_LAYER_TRANSPARENT},
 389         {SMB_VFS_OP(atalk_chmod),               SMB_VFS_OP_CHMOD,       SMB_VFS_LAYER_TRANSPARENT},
 390         {SMB_VFS_OP(atalk_chown),               SMB_VFS_OP_CHOWN,       SMB_VFS_LAYER_TRANSPARENT},
 391
 392         /* Finish VFS operations definition */
 393
 394         {SMB_VFS_OP(NULL),                      SMB_VFS_OP_NOOP,        SMB_VFS_LAYER_NOOP}
 395 };
 396
 397 NTSTATUS vfs_netatalk_init(void);
 398 NTSTATUS vfs_netatalk_init(void)
 399 {
 400         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "netatalk", atalk_ops);
 401 }