source4/ntvfs/posix/vfs_posix.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    POSIX NTVFS backend
   5
   6    Copyright (C) Andrew Tridgell 2004
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21 /*
  22   this implements most of the POSIX NTVFS backend
  23   This is the default backend
  24 */
  25
  26 #include "includes.h"
  27 #include "vfs_posix.h"
  28 #include "librpc/gen_ndr/security.h"
  29 #include "../tdb/include/tdb.h"
  30 #include "tdb_wrap.h"
  31 #include "libcli/security/security.h"
  32 #include "lib/events/events.h"
  33 #include "param/param.h"
  34
  35 /*
  36   setup config options for a posix share
  37 */
  38 static void pvfs_setup_options(struct pvfs_state *pvfs)
  39 {
  40         struct share_config *scfg = pvfs->ntvfs->ctx->config;
  41         const char *eadb;
  42
  43         if (share_bool_option(scfg, SHARE_MAP_HIDDEN, SHARE_MAP_HIDDEN_DEFAULT))
  44                 pvfs->flags |= PVFS_FLAG_MAP_HIDDEN;
  45         if (share_bool_option(scfg, SHARE_MAP_ARCHIVE, SHARE_MAP_ARCHIVE_DEFAULT))
  46                 pvfs->flags |= PVFS_FLAG_MAP_ARCHIVE;
  47         if (share_bool_option(scfg, SHARE_MAP_SYSTEM, SHARE_MAP_SYSTEM_DEFAULT))
  48                 pvfs->flags |= PVFS_FLAG_MAP_SYSTEM;
  49         if (share_bool_option(scfg, SHARE_READONLY, SHARE_READONLY_DEFAULT))
  50                 pvfs->flags |= PVFS_FLAG_READONLY;
  51         if (share_bool_option(scfg, SHARE_STRICT_SYNC, SHARE_STRICT_SYNC_DEFAULT))
  52                 pvfs->flags |= PVFS_FLAG_STRICT_SYNC;
  53         if (share_bool_option(scfg, SHARE_STRICT_LOCKING, SHARE_STRICT_LOCKING_DEFAULT))
  54                 pvfs->flags |= PVFS_FLAG_STRICT_LOCKING;
  55         if (share_bool_option(scfg, SHARE_CI_FILESYSTEM, SHARE_CI_FILESYSTEM_DEFAULT))
  56                 pvfs->flags |= PVFS_FLAG_CI_FILESYSTEM;
  57         if (share_bool_option(scfg, PVFS_FAKE_OPLOCKS, PVFS_FAKE_OPLOCKS_DEFAULT))
  58                 pvfs->flags |= PVFS_FLAG_FAKE_OPLOCKS;
  59         if (share_bool_option(scfg, PVFS_AIO, false))
  60                 pvfs->flags |= PVFS_FLAG_LINUX_AIO;
  61         if (share_bool_option(scfg, PVFS_PERM_OVERRIDE, true))
  62                 pvfs->flags |= PVFS_FLAG_PERM_OVERRIDE;
  63
  64         /* file perm options */
  65         pvfs->options.create_mask       = share_int_option(scfg,
  66                                                            SHARE_CREATE_MASK,
  67                                                            SHARE_CREATE_MASK_DEFAULT);
  68         pvfs->options.dir_mask          = share_int_option(scfg,
  69                                                            SHARE_DIR_MASK,
  70                                                            SHARE_DIR_MASK_DEFAULT);
  71         pvfs->options.force_dir_mode    = share_int_option(scfg,
  72                                                            SHARE_FORCE_DIR_MODE,
  73                                                            SHARE_FORCE_DIR_MODE_DEFAULT);
  74         pvfs->options.force_create_mode = share_int_option(scfg,
  75                                                            SHARE_FORCE_CREATE_MODE,
  76                                                            SHARE_FORCE_CREATE_MODE_DEFAULT);
  77         /* this must be a power of 2 */
  78         pvfs->alloc_size_rounding = share_int_option(scfg,
  79                                                         PVFS_ALLOCATION_ROUNDING,
  80                                                         PVFS_ALLOCATION_ROUNDING_DEFAULT);
  81
  82         pvfs->search.inactivity_time = share_int_option(scfg,
  83                                                         PVFS_SEARCH_INACTIVITY,
  84                                                         PVFS_SEARCH_INACTIVITY_DEFAULT);
  85
  86 #if HAVE_XATTR_SUPPORT
  87         if (share_bool_option(scfg, PVFS_XATTR, PVFS_XATTR_DEFAULT))
  88                 pvfs->flags |= PVFS_FLAG_XATTR_ENABLE;
  89 #endif
  90
  91         pvfs->sharing_violation_delay = share_int_option(scfg,
  92                                                         PVFS_SHARE_DELAY,
  93                                                         PVFS_SHARE_DELAY_DEFAULT);
  94
  95         pvfs->oplock_break_timeout = share_int_option(scfg,
  96                                                       PVFS_OPLOCK_TIMEOUT,
  97                                                       PVFS_OPLOCK_TIMEOUT_DEFAULT);
  98
  99         pvfs->writetime_delay = share_int_option(scfg,
 100                                                  PVFS_WRITETIME_DELAY,
 101                                                  PVFS_WRITETIME_DELAY_DEFAULT);
 102
 103         pvfs->share_name = talloc_strdup(pvfs, scfg->name);
 104
 105         pvfs->fs_attribs =
 106                 FS_ATTR_CASE_SENSITIVE_SEARCH |
 107                 FS_ATTR_CASE_PRESERVED_NAMES |
 108                 FS_ATTR_UNICODE_ON_DISK |
 109                 FS_ATTR_SPARSE_FILES;
 110
 111         /* allow xattrs to be stored in a external tdb */
 112         eadb = share_string_option(scfg, PVFS_EADB, NULL);
 113         if (eadb != NULL) {
 114                 pvfs->ea_db = tdb_wrap_open(pvfs, eadb, 50000,
 115                                             TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
 116                 if (pvfs->ea_db != NULL) {
 117                         pvfs->flags |= PVFS_FLAG_XATTR_ENABLE;
 118                 } else {
 119                         DEBUG(0,("Failed to open eadb '%s' - %s\n",
 120                                  eadb, strerror(errno)));
 121                         pvfs->flags &= ~PVFS_FLAG_XATTR_ENABLE;
 122                 }
 123         }
 124
 125         if (pvfs->flags & PVFS_FLAG_XATTR_ENABLE) {
 126                 pvfs->fs_attribs |= FS_ATTR_NAMED_STREAMS;
 127         }
 128         if (pvfs->flags & PVFS_FLAG_XATTR_ENABLE) {
 129                 pvfs->fs_attribs |= FS_ATTR_PERSISTANT_ACLS;
 130         }
 131
 132         pvfs->sid_cache.creator_owner = dom_sid_parse_talloc(pvfs, SID_CREATOR_OWNER);
 133         pvfs->sid_cache.creator_group = dom_sid_parse_talloc(pvfs, SID_CREATOR_GROUP);
 134
 135         /* check if the system really supports xattrs */
 136         if (pvfs->flags & PVFS_FLAG_XATTR_ENABLE) {
 137                 pvfs_xattr_probe(pvfs);
 138         }
 139
 140         /* enable an ACL backend */
 141         pvfs->acl_ops = pvfs_acl_backend_byname(share_string_option(scfg, PVFS_ACL, "xattr"));
 142 }
 143
 144 static int pvfs_state_destructor(struct pvfs_state *pvfs)
 145 {
 146         struct pvfs_file *f, *fn;
 147         struct pvfs_search_state *s, *sn;
 148
 149         /*
 150          * make sure we cleanup files and searches before anything else
 151          * because there destructors need to acess the pvfs_state struct
 152          */
 153         for (f=pvfs->files.list; f; f=fn) {
 154                 fn = f->next;
 155                 talloc_free(f);
 156         }
 157
 158         for (s=pvfs->search.list; s; s=sn) {
 159                 sn = s->next;
 160                 talloc_free(s);
 161         }
 162
 163         return 0;
 164 }
 165
 166 /*
 167   connect to a share - used when a tree_connect operation comes
 168   in. For a disk based backend we needs to ensure that the base
 169   directory exists (tho it doesn't need to be accessible by the user,
 170   that comes later)
 171 */
 172 static NTSTATUS pvfs_connect(struct ntvfs_module_context *ntvfs,
 173                              struct ntvfs_request *req,
 174                              union smb_tcon* tcon)
 175 {
 176         struct pvfs_state *pvfs;
 177         struct stat st;
 178         char *base_directory;
 179         NTSTATUS status;
 180         const char *sharename;
 181
 182         switch (tcon->generic.level) {
 183         case RAW_TCON_TCON:
 184                 sharename = tcon->tcon.in.service;
 185                 break;
 186         case RAW_TCON_TCONX:
 187                 sharename = tcon->tconx.in.path;
 188                 break;
 189         case RAW_TCON_SMB2:
 190                 sharename = tcon->smb2.in.path;
 191                 break;
 192         default:
 193                 return NT_STATUS_INVALID_LEVEL;
 194         }
 195
 196         if (strncmp(sharename, "\\\\", 2) == 0) {
 197                 char *p = strchr(sharename+2, '\\');
 198                 if (p) {
 199                         sharename = p + 1;
 200                 }
 201         }
 202
 203         /*
 204          * TODO: call this from ntvfs_posix_init()
 205          *       but currently we don't have a lp_ctx there
 206          */
 207         status = pvfs_acl_init(ntvfs->ctx->lp_ctx);
 208         NT_STATUS_NOT_OK_RETURN(status);
 209
 210         pvfs = talloc_zero(ntvfs, struct pvfs_state);
 211         NT_STATUS_HAVE_NO_MEMORY(pvfs);
 212
 213         /* for simplicity of path construction, remove any trailing slash now */
 214         base_directory = talloc_strdup(pvfs, share_string_option(ntvfs->ctx->config, SHARE_PATH, ""));
 215         NT_STATUS_HAVE_NO_MEMORY(base_directory);
 216         if (strcmp(base_directory, "/") != 0) {
 217                 trim_string(base_directory, NULL, "/");
 218         }
 219
 220         pvfs->ntvfs = ntvfs;
 221         pvfs->base_directory = base_directory;
 222
 223         /* the directory must exist. Note that we deliberately don't
 224            check that it is readable */
 225         if (stat(pvfs->base_directory, &st) != 0 || !S_ISDIR(st.st_mode)) {
 226                 DEBUG(0,("pvfs_connect: '%s' is not a directory, when connecting to [%s]\n",
 227                          pvfs->base_directory, sharename));
 228                 return NT_STATUS_BAD_NETWORK_NAME;
 229         }
 230
 231         ntvfs->ctx->fs_type = talloc_strdup(ntvfs->ctx, "NTFS");
 232         NT_STATUS_HAVE_NO_MEMORY(ntvfs->ctx->fs_type);
 233
 234         ntvfs->ctx->dev_type = talloc_strdup(ntvfs->ctx, "A:");
 235         NT_STATUS_HAVE_NO_MEMORY(ntvfs->ctx->dev_type);
 236
 237         if (tcon->generic.level == RAW_TCON_TCONX) {
 238                 tcon->tconx.out.fs_type = ntvfs->ctx->fs_type;
 239                 tcon->tconx.out.dev_type = ntvfs->ctx->dev_type;
 240         }
 241
 242         ntvfs->private_data = pvfs;
 243
 244         pvfs->brl_context = brl_init(pvfs,
 245                                      pvfs->ntvfs->ctx->server_id,
 246                                      pvfs->ntvfs->ctx->lp_ctx,
 247                                      pvfs->ntvfs->ctx->msg_ctx);
 248         if (pvfs->brl_context == NULL) {
 249                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 250         }
 251
 252         pvfs->odb_context = odb_init(pvfs, pvfs->ntvfs->ctx);
 253         if (pvfs->odb_context == NULL) {
 254                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 255         }
 256
 257         /* allow this to be NULL - we just disable change notify */
 258         pvfs->notify_context = notify_init(pvfs,
 259                                            pvfs->ntvfs->ctx->server_id,
 260                                            pvfs->ntvfs->ctx->msg_ctx,
 261                                            pvfs->ntvfs->ctx->lp_ctx,
 262                                            pvfs->ntvfs->ctx->event_ctx,
 263                                            pvfs->ntvfs->ctx->config);
 264
 265         pvfs->wbc_ctx = wbc_init(pvfs,
 266                                  pvfs->ntvfs->ctx->msg_ctx,
 267                                  pvfs->ntvfs->ctx->event_ctx);
 268         if (pvfs->wbc_ctx == NULL) {
 269                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 270         }
 271
 272         /* allocate the search handle -> ptr tree */
 273         pvfs->search.idtree = idr_init(pvfs);
 274         NT_STATUS_HAVE_NO_MEMORY(pvfs->search.idtree);
 275
 276         status = pvfs_mangle_init(pvfs);
 277         NT_STATUS_NOT_OK_RETURN(status);
 278
 279         pvfs_setup_options(pvfs);
 280
 281         talloc_set_destructor(pvfs, pvfs_state_destructor);
 282
 283 #ifdef SIGXFSZ
 284         /* who had the stupid idea to generate a signal on a large
 285            file write instead of just failing it!? */
 286         BlockSignals(true, SIGXFSZ);
 287 #endif
 288
 289         return NT_STATUS_OK;
 290 }
 291
 292 /*
 293   disconnect from a share
 294 */
 295 static NTSTATUS pvfs_disconnect(struct ntvfs_module_context *ntvfs)
 296 {
 297         return NT_STATUS_OK;
 298 }
 299
 300 /*
 301   check if a directory exists
 302 */
 303 static NTSTATUS pvfs_chkpath(struct ntvfs_module_context *ntvfs,
 304                              struct ntvfs_request *req,
 305                              union smb_chkpath *cp)
 306 {
 307         struct pvfs_state *pvfs = talloc_get_type(ntvfs->private_data,
 308                                   struct pvfs_state);
 309         struct pvfs_filename *name;
 310         NTSTATUS status;
 311
 312         /* resolve the cifs name to a posix name */
 313         status = pvfs_resolve_name(pvfs, req, cp->chkpath.in.path, 0, &name);
 314         NT_STATUS_NOT_OK_RETURN(status);
 315
 316         if (!name->exists) {
 317                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 318         }
 319
 320         if (!S_ISDIR(name->st.st_mode)) {
 321                 return NT_STATUS_NOT_A_DIRECTORY;
 322         }
 323
 324         return NT_STATUS_OK;
 325 }
 326
 327 /*
 328   copy a set of files
 329 */
 330 static NTSTATUS pvfs_copy(struct ntvfs_module_context *ntvfs,
 331                           struct ntvfs_request *req, struct smb_copy *cp)
 332 {
 333         DEBUG(0,("pvfs_copy not implemented\n"));
 334         return NT_STATUS_NOT_SUPPORTED;
 335 }
 336
 337 /*
 338   return print queue info
 339 */
 340 static NTSTATUS pvfs_lpq(struct ntvfs_module_context *ntvfs,
 341                          struct ntvfs_request *req, union smb_lpq *lpq)
 342 {
 343         return NT_STATUS_NOT_SUPPORTED;
 344 }
 345
 346 /* SMBtrans - not used on file shares */
 347 static NTSTATUS pvfs_trans(struct ntvfs_module_context *ntvfs,
 348                            struct ntvfs_request *req, struct smb_trans2 *trans2)
 349 {
 350         return NT_STATUS_ACCESS_DENIED;
 351 }
 352
 353 /*
 354   initialialise the POSIX disk backend, registering ourselves with the ntvfs subsystem
 355  */
 356 NTSTATUS ntvfs_posix_init(void)
 357 {
 358         NTSTATUS ret;
 359         struct ntvfs_ops ops;
 360         NTVFS_CURRENT_CRITICAL_SIZES(vers);
 361
 362         ZERO_STRUCT(ops);
 363
 364         ops.type = NTVFS_DISK;
 365
 366         /* fill in all the operations */
 367         ops.connect = pvfs_connect;
 368         ops.disconnect = pvfs_disconnect;
 369         ops.unlink = pvfs_unlink;
 370         ops.chkpath = pvfs_chkpath;
 371         ops.qpathinfo = pvfs_qpathinfo;
 372         ops.setpathinfo = pvfs_setpathinfo;
 373         ops.open = pvfs_open;
 374         ops.mkdir = pvfs_mkdir;
 375         ops.rmdir = pvfs_rmdir;
 376         ops.rename = pvfs_rename;
 377         ops.copy = pvfs_copy;
 378         ops.ioctl = pvfs_ioctl;
 379         ops.read = pvfs_read;
 380         ops.write = pvfs_write;
 381         ops.seek = pvfs_seek;
 382         ops.flush = pvfs_flush;
 383         ops.close = pvfs_close;
 384         ops.exit = pvfs_exit;
 385         ops.lock = pvfs_lock;
 386         ops.setfileinfo = pvfs_setfileinfo;
 387         ops.qfileinfo = pvfs_qfileinfo;
 388         ops.fsinfo = pvfs_fsinfo;
 389         ops.lpq = pvfs_lpq;
 390         ops.search_first = pvfs_search_first;
 391         ops.search_next = pvfs_search_next;
 392         ops.search_close = pvfs_search_close;
 393         ops.trans = pvfs_trans;
 394         ops.logoff = pvfs_logoff;
 395         ops.async_setup = pvfs_async_setup;
 396         ops.cancel = pvfs_cancel;
 397         ops.notify = pvfs_notify;
 398
 399         /* register ourselves with the NTVFS subsystem. We register
 400            under the name 'default' as we wish to be the default
 401            backend, and also register as 'posix' */
 402         ops.name = "default";
 403         ret = ntvfs_register(&ops, &vers);
 404
 405         if (!NT_STATUS_IS_OK(ret)) {
 406                 DEBUG(0,("Failed to register POSIX backend as '%s'!\n", ops.name));
 407         }
 408
 409         ops.name = "posix";
 410         ret = ntvfs_register(&ops, &vers);
 411
 412         if (!NT_STATUS_IS_OK(ret)) {
 413                 DEBUG(0,("Failed to register POSIX backend as '%s'!\n", ops.name));
 414         }
 415
 416         if (NT_STATUS_IS_OK(ret)) {
 417                 ret = ntvfs_common_init();
 418         }
 419
 420         return ret;
 421 }