source3/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 3 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, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "includes.h"
  22 #include "smbd/smbd.h"
  23 #include "system/filesys.h"
  24
  25 #undef DBGC_CLASS
  26 #define DBGC_CLASS DBGC_VFS
  27
  28 #define APPLEDOUBLE     ".AppleDouble"
  29 #define ADOUBLEMODE     0777
  30
  31 /* atalk functions */
  32
  33 static int atalk_build_paths(TALLOC_CTX *ctx, const char *path,
  34                              const char *fname,
  35                              char **adbl_path, char **orig_path,
  36                              SMB_STRUCT_STAT *adbl_info,
  37                              SMB_STRUCT_STAT *orig_info);
  38
  39 static int atalk_unlink_file(const char *path);
  40
  41 static int atalk_get_path_ptr(char *path)
  42 {
  43         int i   = 0;
  44         int ptr = 0;
  45
  46         for (i = 0; path[i]; i ++) {
  47                 if (path[i] == '/')
  48                         ptr = i;
  49                 /* get out some 'spam';) from win32's file name */
  50                 else if (path[i] == ':') {
  51                         path[i] = '\0';
  52                         break;
  53                 }
  54         }
  55
  56         return ptr;
  57 }
  58
  59 static int atalk_build_paths(TALLOC_CTX *ctx, const char *path,
  60                              const char *fname,
  61                              char **adbl_path, char **orig_path,
  62                              SMB_STRUCT_STAT *adbl_info,
  63                              SMB_STRUCT_STAT *orig_info)
  64 {
  65         int ptr0 = 0;
  66         int ptr1 = 0;
  67         char *dname = 0;
  68         char *name  = 0;
  69
  70         if (!ctx || !path || !fname || !adbl_path || !orig_path ||
  71                 !adbl_info || !orig_info)
  72                 return -1;
  73 #if 0
  74         DEBUG(3, ("ATALK: PATH: %s[%s]\n", path, fname));
  75 #endif
  76         if (strstr_m(path, APPLEDOUBLE) || strstr_m(fname, APPLEDOUBLE)) {
  77                 DEBUG(3, ("ATALK: path %s[%s] already contains %s\n", path, fname, APPLEDOUBLE));
  78                 return -1;
  79         }
  80
  81         if (fname[0] == '.') ptr0 ++;
  82         if (fname[1] == '/') ptr0 ++;
  83
  84         *orig_path = talloc_asprintf(ctx, "%s/%s", path, &fname[ptr0]);
  85
  86         /* get pointer to last '/' */
  87         ptr1 = atalk_get_path_ptr(*orig_path);
  88
  89         sys_lstat(*orig_path, orig_info, false);
  90
  91         if (S_ISDIR(orig_info->st_ex_mode)) {
  92                 *adbl_path = talloc_asprintf(ctx, "%s/%s/%s/",
  93                   path, &fname[ptr0], APPLEDOUBLE);
  94         } else {
  95                 dname = talloc_strdup(ctx, *orig_path);
  96                 dname[ptr1] = '\0';
  97                 name = *orig_path;
  98                 *adbl_path = talloc_asprintf(ctx, "%s/%s/%s",
  99                   dname, APPLEDOUBLE, &name[ptr1 + 1]);
 100         }
 101 #if 0
 102         DEBUG(3, ("ATALK: DEBUG:\n%s\n%s\n", *orig_path, *adbl_path));
 103 #endif
 104         sys_lstat(*adbl_path, adbl_info, false);
 105         return 0;
 106 }
 107
 108 static int atalk_unlink_file(const char *path)
 109 {
 110         int ret = 0;
 111
 112         become_root();
 113         ret = unlink(path);
 114         unbecome_root();
 115
 116         return ret;
 117 }
 118
 119 static void atalk_add_to_list(name_compare_entry **list)
 120 {
 121         int i, count = 0;
 122         name_compare_entry *new_list = 0;
 123         name_compare_entry *cur_list = 0;
 124
 125         cur_list = *list;
 126
 127         if (cur_list) {
 128                 for (i = 0, count = 0; cur_list[i].name; i ++, count ++) {
 129                         if (strstr_m(cur_list[i].name, APPLEDOUBLE))
 130                                 return;
 131                 }
 132         }
 133
 134         if (!(new_list = SMB_CALLOC_ARRAY(name_compare_entry, count + 2)))
 135                 return;
 136
 137         for (i = 0; i < count; i ++) {
 138                 new_list[i].name    = SMB_STRDUP(cur_list[i].name);
 139                 new_list[i].is_wild = cur_list[i].is_wild;
 140         }
 141
 142         new_list[i].name    = SMB_STRDUP(APPLEDOUBLE);
 143         new_list[i].is_wild = False;
 144
 145         free_namearray(*list);
 146
 147         *list = new_list;
 148         new_list = 0;
 149         cur_list = 0;
 150 }
 151
 152 static void atalk_rrmdir(TALLOC_CTX *ctx, char *path)
 153 {
 154         char *dpath;
 155         struct dirent *dent = 0;
 156         DIR *dir;
 157
 158         if (!path) return;
 159
 160         dir = opendir(path);
 161         if (!dir) return;
 162
 163         while (NULL != (dent = readdir(dir))) {
 164                 if (strcmp(dent->d_name, ".") == 0 ||
 165                     strcmp(dent->d_name, "..") == 0)
 166                         continue;
 167                 if (!(dpath = talloc_asprintf(ctx, "%s/%s",
 168                                               path, dent->d_name)))
 169                         continue;
 170                 atalk_unlink_file(dpath);
 171         }
 172
 173         closedir(dir);
 174 }
 175
 176 /* Disk operations */
 177
 178 /* Directory operations */
 179
 180 static DIR *atalk_opendir(struct vfs_handle_struct *handle, const char *fname, const char *mask, uint32 attr)
 181 {
 182         DIR *ret = 0;
 183
 184         ret = SMB_VFS_NEXT_OPENDIR(handle, fname, mask, attr);
 185
 186         /*
 187          * when we try to perform delete operation upon file which has fork
 188          * in ./.AppleDouble and this directory wasn't hidden by Samba,
 189          * MS Windows explorer causes the error: "Cannot find the specified file"
 190          * There is some workaround to avoid this situation, i.e. if
 191          * connection has not .AppleDouble entry in either veto or hide
 192          * list then it would be nice to add one.
 193          */
 194
 195         atalk_add_to_list(&handle->conn->hide_list);
 196         atalk_add_to_list(&handle->conn->veto_list);
 197
 198         return ret;
 199 }
 200
 201 static DIR *atalk_fdopendir(struct vfs_handle_struct *handle, files_struct *fsp, const char *mask, uint32 attr)
 202 {
 203         DIR *ret = 0;
 204
 205         ret = SMB_VFS_NEXT_FDOPENDIR(handle, fsp, mask, attr);
 206
 207         if (ret == NULL) {
 208                 return ret;
 209         }
 210
 211         /*
 212          * when we try to perform delete operation upon file which has fork
 213          * in ./.AppleDouble and this directory wasn't hidden by Samba,
 214          * MS Windows explorer causes the error: "Cannot find the specified file"
 215          * There is some workaround to avoid this situation, i.e. if
 216          * connection has not .AppleDouble entry in either veto or hide
 217          * list then it would be nice to add one.
 218          */
 219
 220         atalk_add_to_list(&handle->conn->hide_list);
 221         atalk_add_to_list(&handle->conn->veto_list);
 222
 223         return ret;
 224 }
 225
 226 static int atalk_rmdir(struct vfs_handle_struct *handle, const char *path)
 227 {
 228         bool add = False;
 229         TALLOC_CTX *ctx = 0;
 230         char *dpath;
 231
 232         if (!handle->conn->cwd || !path) goto exit_rmdir;
 233
 234         /* due to there is no way to change bDeleteVetoFiles variable
 235          * from this module, gotta use talloc stuff..
 236          */
 237
 238         strstr_m(path, APPLEDOUBLE) ? (add = False) : (add = True);
 239
 240         if (!(ctx = talloc_init("remove_directory")))
 241                 goto exit_rmdir;
 242
 243         if (!(dpath = talloc_asprintf(ctx, "%s/%s%s",
 244           handle->conn->cwd, path, add ? "/"APPLEDOUBLE : "")))
 245                 goto exit_rmdir;
 246
 247         atalk_rrmdir(ctx, dpath);
 248
 249 exit_rmdir:
 250         talloc_destroy(ctx);
 251         return SMB_VFS_NEXT_RMDIR(handle, path);
 252 }
 253
 254 /* File operations */
 255
 256 static int atalk_rename(struct vfs_handle_struct *handle,
 257                         const struct smb_filename *smb_fname_src,
 258                         const struct smb_filename *smb_fname_dst)
 259 {
 260         int ret = 0;
 261         char *oldname = NULL;
 262         char *adbl_path = NULL;
 263         char *orig_path = NULL;
 264         SMB_STRUCT_STAT adbl_info;
 265         SMB_STRUCT_STAT orig_info;
 266         NTSTATUS status;
 267
 268         ret = SMB_VFS_NEXT_RENAME(handle, smb_fname_src, smb_fname_dst);
 269
 270         status = get_full_smb_filename(talloc_tos(), smb_fname_src, &oldname);
 271         if (!NT_STATUS_IS_OK(status)) {
 272                 return ret;
 273         }
 274
 275         if (atalk_build_paths(talloc_tos(), handle->conn->cwd, oldname,
 276                               &adbl_path, &orig_path, &adbl_info,
 277                               &orig_info) != 0)
 278                 goto exit_rename;
 279
 280         if (S_ISDIR(orig_info.st_ex_mode) || S_ISREG(orig_info.st_ex_mode)) {
 281                 DEBUG(3, ("ATALK: %s has passed..\n", adbl_path));
 282                 goto exit_rename;
 283         }
 284
 285         atalk_unlink_file(adbl_path);
 286
 287 exit_rename:
 288         TALLOC_FREE(oldname);
 289         TALLOC_FREE(adbl_path);
 290         TALLOC_FREE(orig_path);
 291         return ret;
 292 }
 293
 294 static int atalk_unlink(struct vfs_handle_struct *handle,
 295                         const struct smb_filename *smb_fname)
 296 {
 297         int ret = 0, i;
 298         char *path = NULL;
 299         char *adbl_path = NULL;
 300         char *orig_path = NULL;
 301         SMB_STRUCT_STAT adbl_info;
 302         SMB_STRUCT_STAT orig_info;
 303         NTSTATUS status;
 304
 305         ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 306
 307         status = get_full_smb_filename(talloc_tos(), smb_fname, &path);
 308         if (!NT_STATUS_IS_OK(status)) {
 309                 return ret;
 310         }
 311
 312         /* no .AppleDouble sync if veto or hide list is empty,
 313          * otherwise "Cannot find the specified file" error will be caused
 314          */
 315
 316         if (!handle->conn->veto_list) return ret;
 317         if (!handle->conn->hide_list) return ret;
 318
 319         for (i = 0; handle->conn->veto_list[i].name; i ++) {
 320                 if (strstr_m(handle->conn->veto_list[i].name, APPLEDOUBLE))
 321                         break;
 322         }
 323
 324         if (!handle->conn->veto_list[i].name) {
 325                 for (i = 0; handle->conn->hide_list[i].name; i ++) {
 326                         if (strstr_m(handle->conn->hide_list[i].name, APPLEDOUBLE))
 327                                 break;
 328                         else {
 329                                 DEBUG(3, ("ATALK: %s is not hidden, skipped..\n",
 330                                   APPLEDOUBLE));
 331                                 goto exit_unlink;
 332                         }
 333                 }
 334         }
 335
 336         if (atalk_build_paths(talloc_tos(), handle->conn->cwd, path,
 337                               &adbl_path, &orig_path,
 338                               &adbl_info, &orig_info) != 0)
 339                 goto exit_unlink;
 340
 341         if (S_ISDIR(orig_info.st_ex_mode) || S_ISREG(orig_info.st_ex_mode)) {
 342                 DEBUG(3, ("ATALK: %s has passed..\n", adbl_path));
 343                 goto exit_unlink;
 344         }
 345
 346         atalk_unlink_file(adbl_path);
 347
 348 exit_unlink:
 349         TALLOC_FREE(path);
 350         TALLOC_FREE(adbl_path);
 351         TALLOC_FREE(orig_path);
 352         return ret;
 353 }
 354
 355 static int atalk_chmod(struct vfs_handle_struct *handle, const char *path, mode_t mode)
 356 {
 357         int ret = 0;
 358         char *adbl_path = 0;
 359         char *orig_path = 0;
 360         SMB_STRUCT_STAT adbl_info;
 361         SMB_STRUCT_STAT orig_info;
 362         TALLOC_CTX *ctx;
 363
 364         ret = SMB_VFS_NEXT_CHMOD(handle, path, mode);
 365
 366         if (!path) return ret;
 367
 368         if (!(ctx = talloc_init("chmod_file")))
 369                 return ret;
 370
 371         if (atalk_build_paths(ctx, handle->conn->cwd, path, &adbl_path,
 372                               &orig_path, &adbl_info, &orig_info) != 0)
 373                 goto exit_chmod;
 374
 375         if (!S_ISDIR(orig_info.st_ex_mode) && !S_ISREG(orig_info.st_ex_mode)) {
 376                 DEBUG(3, ("ATALK: %s has passed..\n", orig_path));
 377                 goto exit_chmod;
 378         }
 379
 380         chmod(adbl_path, ADOUBLEMODE);
 381
 382 exit_chmod:
 383         talloc_destroy(ctx);
 384         return ret;
 385 }
 386
 387 static int atalk_chown(struct vfs_handle_struct *handle, const char *path, uid_t uid, gid_t gid)
 388 {
 389         int ret = 0;
 390         char *adbl_path = 0;
 391         char *orig_path = 0;
 392         SMB_STRUCT_STAT adbl_info;
 393         SMB_STRUCT_STAT orig_info;
 394         TALLOC_CTX *ctx;
 395
 396         ret = SMB_VFS_NEXT_CHOWN(handle, path, uid, gid);
 397
 398         if (!path) return ret;
 399
 400         if (!(ctx = talloc_init("chown_file")))
 401                 return ret;
 402
 403         if (atalk_build_paths(ctx, handle->conn->cwd, path,
 404                               &adbl_path, &orig_path,
 405                               &adbl_info, &orig_info) != 0)
 406                 goto exit_chown;
 407
 408         if (!S_ISDIR(orig_info.st_ex_mode) && !S_ISREG(orig_info.st_ex_mode)) {
 409                 DEBUG(3, ("ATALK: %s has passed..\n", orig_path));
 410                 goto exit_chown;
 411         }
 412
 413         if (chown(adbl_path, uid, gid) == -1) {
 414                 DEBUG(3, ("ATALK: chown error %s\n", strerror(errno)));
 415         }
 416
 417 exit_chown:
 418         talloc_destroy(ctx);
 419         return ret;
 420 }
 421
 422 static int atalk_lchown(struct vfs_handle_struct *handle, const char *path, uid_t uid, gid_t gid)
 423 {
 424         int ret = 0;
 425         char *adbl_path = 0;
 426         char *orig_path = 0;
 427         SMB_STRUCT_STAT adbl_info;
 428         SMB_STRUCT_STAT orig_info;
 429         TALLOC_CTX *ctx;
 430
 431         ret = SMB_VFS_NEXT_CHOWN(handle, path, uid, gid);
 432
 433         if (!path) return ret;
 434
 435         if (!(ctx = talloc_init("lchown_file")))
 436                 return ret;
 437
 438         if (atalk_build_paths(ctx, handle->conn->cwd, path,
 439                               &adbl_path, &orig_path,
 440                               &adbl_info, &orig_info) != 0)
 441                 goto exit_lchown;
 442
 443         if (!S_ISDIR(orig_info.st_ex_mode) && !S_ISREG(orig_info.st_ex_mode)) {
 444                 DEBUG(3, ("ATALK: %s has passed..\n", orig_path));
 445                 goto exit_lchown;
 446         }
 447
 448         if (lchown(adbl_path, uid, gid) == -1) {
 449                 DEBUG(3, ("ATALK: lchown error %s\n", strerror(errno)));
 450         }
 451
 452 exit_lchown:
 453         talloc_destroy(ctx);
 454         return ret;
 455 }
 456
 457 static struct vfs_fn_pointers vfs_netatalk_fns = {
 458         .opendir_fn = atalk_opendir,
 459         .fdopendir_fn = atalk_fdopendir,
 460         .rmdir_fn = atalk_rmdir,
 461         .rename_fn = atalk_rename,
 462         .unlink_fn = atalk_unlink,
 463         .chmod_fn = atalk_chmod,
 464         .chown_fn = atalk_chown,
 465         .lchown_fn = atalk_lchown,
 466 };
 467
 468 NTSTATUS vfs_netatalk_init(void);
 469 NTSTATUS vfs_netatalk_init(void)
 470 {
 471         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "netatalk",
 472                                 &vfs_netatalk_fns);
 473 }