source3/modules/vfs_netatalk.c

   1 /*
   2  * AppleTalk VFS module for Samba-3.x
   3  *
   4  * Copyright (C) Alexei Kotovich, 2002
   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 "config.h"
  22 #include <stdio.h>
  23 #include <sys/stat.h>
  24 #ifdef HAVE_UTIME_H
  25 #include <utime.h>
  26 #endif
  27 #ifdef HAVE_DIRENT_H
  28 #include <dirent.h>
  29 #endif
  30 #ifdef HAVE_FCNTL_H
  31 #include <fcntl.h>
  32 #endif
  33 #include <errno.h>
  34 #include <string.h>
  35 #include <includes.h>
  36 #include <vfs.h>
  37
  38 #define APPLEDOUBLE     ".AppleDouble"
  39 #define ADOUBLEMODE     0777
  40
  41 /* atalk functions */
  42
  43 static int atalk_build_paths(TALLOC_CTX *ctx, const char *path,
  44   const char *fname, char **adbl_path, char **orig_path,
  45   SMB_STRUCT_STAT *adbl_info, SMB_STRUCT_STAT *orig_info);
  46
  47 static int atalk_unlink_file(const char *path);
  48
  49 static struct vfs_ops default_vfs_ops;  /* For passthrough operation */
  50 static struct smb_vfs_handle_struct *atalk_handle;
  51
  52 static int atalk_get_path_ptr(char *path)
  53 {
  54         int i   = 0;
  55         int ptr = 0;
  56
  57         for (i = 0; path[i]; i ++) {
  58                 if (path[i] == '/')
  59                         ptr = i;
  60                 /* get out some 'spam';) from win32's file name */
  61                 else if (path[i] == ':') {
  62                         path[i] = '\0';
  63                         break;
  64                 }
  65         }
  66
  67         return ptr;
  68 }
  69
  70 static int atalk_build_paths(TALLOC_CTX *ctx, const char *path, const char *fname,
  71                               char **adbl_path, char **orig_path,
  72                               SMB_STRUCT_STAT *adbl_info, SMB_STRUCT_STAT *orig_info)
  73 {
  74         int ptr0 = 0;
  75         int ptr1 = 0;
  76         char *dname = 0;
  77         char *name  = 0;
  78
  79         if (!ctx || !path || !fname || !adbl_path || !orig_path ||
  80                 !adbl_info || !orig_info)
  81                 return -1;
  82 #if 0
  83         DEBUG(3, ("ATALK: PATH: %s[%s]\n", path, fname));
  84 #endif
  85         if (strstr(path, APPLEDOUBLE) || strstr(fname, APPLEDOUBLE)) {
  86                 DEBUG(3, ("ATALK: path %s[%s] already contains %s\n", path, fname, APPLEDOUBLE));
  87                 return -1;
  88         }
  89
  90         if (fname[0] == '.') ptr0 ++;
  91         if (fname[1] == '/') ptr0 ++;
  92
  93         *orig_path = talloc_asprintf(ctx, "%s/%s", path, &fname[ptr0]);
  94
  95         /* get pointer to last '/' */
  96         ptr1 = atalk_get_path_ptr(*orig_path);
  97
  98         sys_lstat(*orig_path, orig_info);
  99
 100         if (S_ISDIR(orig_info->st_mode)) {
 101                 *adbl_path = talloc_asprintf(ctx, "%s/%s/%s/",
 102                   path, &fname[ptr0], APPLEDOUBLE);
 103         } else {
 104                 dname = talloc_strdup(ctx, *orig_path);
 105                 dname[ptr1] = '\0';
 106                 name = *orig_path;
 107                 *adbl_path = talloc_asprintf(ctx, "%s/%s/%s",
 108                   dname, APPLEDOUBLE, &name[ptr1 + 1]);
 109         }
 110 #if 0
 111         DEBUG(3, ("ATALK: DEBUG:\n%s\n%s\n", *orig_path, *adbl_path));
 112 #endif
 113         sys_lstat(*adbl_path, adbl_info);
 114         return 0;
 115 }
 116
 117 static int atalk_unlink_file(const char *path)
 118 {
 119         int ret = 0;
 120
 121         become_root();
 122         ret = unlink(path);
 123         unbecome_root();
 124
 125         return ret;
 126 }
 127
 128 static void atalk_add_to_list(name_compare_entry **list)
 129 {
 130         int i, count = 0;
 131         name_compare_entry *new_list = 0;
 132         name_compare_entry *cur_list = 0;
 133
 134         cur_list = *list;
 135
 136         if (cur_list) {
 137                 for (i = 0, count = 0; cur_list[i].name; i ++, count ++) {
 138                         if (strstr(cur_list[i].name, APPLEDOUBLE))
 139                                 return;
 140                 }
 141         }
 142
 143         if (!(new_list = calloc(1,
 144           (count == 0 ? 1 : count + 1) * sizeof(name_compare_entry))))
 145                 return;
 146
 147         for (i = 0; i < count; i ++) {
 148                 new_list[i].name    = strdup(cur_list[i].name);
 149                 new_list[i].is_wild = cur_list[i].is_wild;
 150         }
 151
 152         new_list[i].name    = strdup(APPLEDOUBLE);
 153         new_list[i].is_wild = False;
 154
 155         free_namearray(*list);
 156
 157         *list = new_list;
 158         new_list = 0;
 159         cur_list = 0;
 160 }
 161
 162 static void atalk_rrmdir(TALLOC_CTX *ctx, char *path)
 163 {
 164         char *dpath;
 165         struct dirent *dent = 0;
 166         DIR *dir;
 167
 168         if (!path) return;
 169
 170         dir = opendir(path);
 171         if (!dir) return;
 172
 173         while (NULL != (dent = readdir(dir))) {
 174                 if (strcmp(dent->d_name, ".") == 0 ||
 175                     strcmp(dent->d_name, "..") == 0)
 176                         continue;
 177                 if (!(dpath = talloc_asprintf(ctx, "%s/%s",
 178                                               path, dent->d_name)))
 179                         continue;
 180                 atalk_unlink_file(dpath);
 181         }
 182
 183         closedir(dir);
 184 }
 185
 186 /* Disk operations */
 187
 188 /* Directory operations */
 189
 190 DIR *atalk_opendir(struct connection_struct *conn, const char *fname)
 191 {
 192         DIR *ret = 0;
 193
 194         ret = default_vfs_ops.opendir(conn, fname);
 195
 196         /*
 197          * when we try to perform delete operation upon file which has fork
 198          * in ./.AppleDouble and this directory wasn't hidden by Samba,
 199          * MS Windows explorer causes the error: "Cannot find the specified file"
 200          * There is some workaround to avoid this situation, i.e. if
 201          * connection has not .AppleDouble entry in either veto or hide
 202          * list then it would be nice to add one.
 203          */
 204
 205         atalk_add_to_list(&conn->hide_list);
 206         atalk_add_to_list(&conn->veto_list);
 207
 208         return ret;
 209 }
 210
 211 static int atalk_rmdir(struct connection_struct *conn, const char *path)
 212 {
 213         BOOL add = False;
 214         TALLOC_CTX *ctx = 0;
 215         char *dpath;
 216
 217         if (!conn || !conn->origpath || !path) goto exit_rmdir;
 218
 219         /* due to there is no way to change bDeleteVetoFiles variable
 220          * from this module, gotta use talloc stuff..
 221          */
 222
 223         strstr(path, APPLEDOUBLE) ? (add = False) : (add = True);
 224
 225         if (!(ctx = talloc_init("remove_directory")))
 226                 goto exit_rmdir;
 227
 228         if (!(dpath = talloc_asprintf(ctx, "%s/%s%s",
 229           conn->origpath, path, add ? "/"APPLEDOUBLE : "")))
 230                 goto exit_rmdir;
 231
 232         atalk_rrmdir(ctx, dpath);
 233
 234 exit_rmdir:
 235         talloc_destroy(ctx);
 236         return default_vfs_ops.rmdir(conn, path);
 237 }
 238
 239 /* File operations */
 240
 241 static int atalk_rename(struct connection_struct *conn, const char *old, const char *new)
 242 {
 243         int ret = 0;
 244         char *adbl_path = 0;
 245         char *orig_path = 0;
 246         SMB_STRUCT_STAT adbl_info;
 247         SMB_STRUCT_STAT orig_info;
 248         TALLOC_CTX *ctx;
 249
 250         ret = default_vfs_ops.rename(conn, old, new);
 251
 252         if (!conn || !old) return ret;
 253
 254         if (!(ctx = talloc_init("rename_file")))
 255                 return ret;
 256
 257         if (atalk_build_paths(ctx, conn->origpath, old, &adbl_path, &orig_path,
 258           &adbl_info, &orig_info) != 0)
 259                 return ret;
 260
 261         if (S_ISDIR(orig_info.st_mode) || S_ISREG(orig_info.st_mode)) {
 262                 DEBUG(3, ("ATALK: %s has passed..\n", adbl_path));
 263                 goto exit_rename;
 264         }
 265
 266         atalk_unlink_file(adbl_path);
 267
 268 exit_rename:
 269         talloc_destroy(ctx);
 270         return ret;
 271 }
 272
 273 static int atalk_unlink(struct connection_struct *conn, const char *path)
 274 {
 275         int ret = 0, i;
 276         char *adbl_path = 0;
 277         char *orig_path = 0;
 278         SMB_STRUCT_STAT adbl_info;
 279         SMB_STRUCT_STAT orig_info;
 280         TALLOC_CTX *ctx;
 281
 282         ret = default_vfs_ops.unlink(conn, path);
 283
 284         if (!conn || !path) return ret;
 285
 286         /* no .AppleDouble sync if veto or hide list is empty,
 287          * otherwise "Cannot find the specified file" error will be caused
 288          */
 289
 290         if (!conn->veto_list) return ret;
 291         if (!conn->hide_list) return ret;
 292
 293         for (i = 0; conn->veto_list[i].name; i ++) {
 294                 if (strstr(conn->veto_list[i].name, APPLEDOUBLE))
 295                         break;
 296         }
 297
 298         if (!conn->veto_list[i].name) {
 299                 for (i = 0; conn->hide_list[i].name; i ++) {
 300                         if (strstr(conn->hide_list[i].name, APPLEDOUBLE))
 301                                 break;
 302                         else {
 303                                 DEBUG(3, ("ATALK: %s is not hidden, skipped..\n",
 304                                   APPLEDOUBLE));
 305                                 return ret;
 306                         }
 307                 }
 308         }
 309
 310         if (!(ctx = talloc_init("unlink_file")))
 311                 return ret;
 312
 313         if (atalk_build_paths(ctx, conn->origpath, path, &adbl_path, &orig_path,
 314           &adbl_info, &orig_info) != 0)
 315                 return ret;
 316
 317         if (S_ISDIR(orig_info.st_mode) || S_ISREG(orig_info.st_mode)) {
 318                 DEBUG(3, ("ATALK: %s has passed..\n", adbl_path));
 319                 goto exit_unlink;
 320         }
 321
 322         atalk_unlink_file(adbl_path);
 323
 324 exit_unlink:
 325         talloc_destroy(ctx);
 326         return ret;
 327 }
 328
 329 static int atalk_chmod(struct connection_struct *conn, const char *path, mode_t mode)
 330 {
 331         int ret = 0;
 332         char *adbl_path = 0;
 333         char *orig_path = 0;
 334         SMB_STRUCT_STAT adbl_info;
 335         SMB_STRUCT_STAT orig_info;
 336         TALLOC_CTX *ctx;
 337
 338         ret = default_vfs_ops.chmod(conn, path, mode);
 339
 340         if (!conn || !path) return ret;
 341
 342         if (!(ctx = talloc_init("chmod_file")))
 343                 return ret;
 344
 345         if (atalk_build_paths(ctx, conn->origpath, path, &adbl_path, &orig_path,
 346           &adbl_info, &orig_info) != 0)
 347                 return ret;
 348
 349         if (!S_ISDIR(orig_info.st_mode) && !S_ISREG(orig_info.st_mode)) {
 350                 DEBUG(3, ("ATALK: %s has passed..\n", orig_path));
 351                 goto exit_chmod;
 352         }
 353
 354         chmod(adbl_path, ADOUBLEMODE);
 355
 356 exit_chmod:
 357         talloc_destroy(ctx);
 358         return ret;
 359 }
 360
 361 static int atalk_chown(struct connection_struct *conn, const char *path, uid_t uid, gid_t gid)
 362 {
 363         int ret = 0;
 364         char *adbl_path = 0;
 365         char *orig_path = 0;
 366         SMB_STRUCT_STAT adbl_info;
 367         SMB_STRUCT_STAT orig_info;
 368         TALLOC_CTX *ctx;
 369
 370         ret = default_vfs_ops.chown(conn, path, uid, gid);
 371
 372         if (!conn || !path) return ret;
 373
 374         if (!(ctx = talloc_init("chown_file")))
 375                 return ret;
 376
 377         if (atalk_build_paths(ctx, conn->origpath, path, &adbl_path, &orig_path,
 378           &adbl_info, &orig_info) != 0)
 379                 return ret;
 380
 381         if (!S_ISDIR(orig_info.st_mode) && !S_ISREG(orig_info.st_mode)) {
 382                 DEBUG(3, ("ATALK: %s has passed..\n", orig_path));
 383                 goto exit_chown;
 384         }
 385
 386         chown(adbl_path, uid, gid);
 387
 388 exit_chown:
 389         talloc_destroy(ctx);
 390         return ret;
 391 }
 392
 393 static vfs_op_tuple atalk_ops[] = {
 394
 395         /* Directory operations */
 396
 397         {atalk_opendir,         SMB_VFS_OP_OPENDIR,     SMB_VFS_LAYER_TRANSPARENT},
 398         {atalk_rmdir,           SMB_VFS_OP_RMDIR,       SMB_VFS_LAYER_TRANSPARENT},
 399
 400         /* File operations */
 401
 402         {atalk_rename,          SMB_VFS_OP_RENAME,      SMB_VFS_LAYER_TRANSPARENT},
 403         {atalk_unlink,          SMB_VFS_OP_UNLINK,      SMB_VFS_LAYER_TRANSPARENT},
 404         {atalk_chmod,           SMB_VFS_OP_CHMOD,       SMB_VFS_LAYER_TRANSPARENT},
 405         {atalk_chown,           SMB_VFS_OP_CHOWN,       SMB_VFS_LAYER_TRANSPARENT},
 406
 407         /* Finish VFS operations definition */
 408
 409         {NULL,                  SMB_VFS_OP_NOOP,        SMB_VFS_LAYER_NOOP}
 410 };
 411
 412 /* VFS initialisation function.  Return vfs_op_tuple array back to SAMBA. */
 413 static vfs_op_tuple *netatalk_init(const struct vfs_ops *def_vfs_ops,
 414   struct smb_vfs_handle_struct *vfs_handle)
 415 {
 416         memcpy(&default_vfs_ops, def_vfs_ops, sizeof(struct vfs_ops));
 417
 418         atalk_handle = vfs_handle;
 419
 420         DEBUG(3, ("ATALK: vfs module loaded\n"));
 421         return atalk_ops;
 422 }
 423
 424 int vfs_netatalk_init(void)
 425 {
 426         return smb_register_vfs("netatalk", netatalk_init, SMB_VFS_INTERFACE_VERSION);
 427 }