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