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