text: /* 
     Unix SMB/CIFS implementation.
  
     POSIX NTVFS backend
  
     Copyright (C) Andrew Tridgell 2004
  
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
     
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
     
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
  /*
    this implements most of the POSIX NTVFS backend
    This is the default backend
  */
  
  #include "includes.h"
  #include "vfs_posix.h"
  #include "librpc/gen_ndr/security.h"
  #include <tdb.h>
  #include "lib/util/tdb_wrap.h"
  #include "libcli/security/security.h"
  #include "lib/events/events.h"
  #include "param/param.h"
  
  /*
    setup config options for a posix share
  */
  static void pvfs_setup_options(struct pvfs_state *pvfs)
  {
  	struct share_config *scfg = pvfs->ntvfs->ctx->config;
  	const char *eadb;
  	bool def_perm_override = false;
  
  	if (share_bool_option(scfg, SHARE_MAP_HIDDEN, SHARE_MAP_HIDDEN_DEFAULT))
  		pvfs->flags |= PVFS_FLAG_MAP_HIDDEN;
  	if (share_bool_option(scfg, SHARE_MAP_ARCHIVE, SHARE_MAP_ARCHIVE_DEFAULT))
  		pvfs->flags |= PVFS_FLAG_MAP_ARCHIVE;
  	if (share_bool_option(scfg, SHARE_MAP_SYSTEM, SHARE_MAP_SYSTEM_DEFAULT))
  		pvfs->flags |= PVFS_FLAG_MAP_SYSTEM;
  	if (share_bool_option(scfg, SHARE_READONLY, SHARE_READONLY_DEFAULT))
  		pvfs->flags |= PVFS_FLAG_READONLY;
  	if (share_bool_option(scfg, SHARE_STRICT_SYNC, SHARE_STRICT_SYNC_DEFAULT))
  		pvfs->flags |= PVFS_FLAG_STRICT_SYNC;
  	if (share_bool_option(scfg, SHARE_STRICT_LOCKING, SHARE_STRICT_LOCKING_DEFAULT))
  		pvfs->flags |= PVFS_FLAG_STRICT_LOCKING;
  	if (share_bool_option(scfg, SHARE_CI_FILESYSTEM, SHARE_CI_FILESYSTEM_DEFAULT))
  		pvfs->flags |= PVFS_FLAG_CI_FILESYSTEM;
  	if (share_bool_option(scfg, PVFS_FAKE_OPLOCKS, PVFS_FAKE_OPLOCKS_DEFAULT))
  		pvfs->flags |= PVFS_FLAG_FAKE_OPLOCKS;
  	if (share_bool_option(scfg, PVFS_AIO, false))
  		pvfs->flags |= PVFS_FLAG_LINUX_AIO;
  
  #if defined(O_DIRECTORY) && defined(O_NOFOLLOW)
  	/* set PVFS_PERM_OVERRIDE by default only if the system
  	 * supports the necessary capabilities to make it secure
  	 */
  	def_perm_override = true;
  #endif
  	if (share_bool_option(scfg, PVFS_PERM_OVERRIDE, def_perm_override))
  		pvfs->flags |= PVFS_FLAG_PERM_OVERRIDE;
  
  	/* file perm options */
  	pvfs->options.create_mask       = share_int_option(scfg,
  							   SHARE_CREATE_MASK,
  							   SHARE_CREATE_MASK_DEFAULT);
  	pvfs->options.dir_mask          = share_int_option(scfg,
  							   SHARE_DIR_MASK,
  							   SHARE_DIR_MASK_DEFAULT);
  	pvfs->options.force_dir_mode    = share_int_option(scfg,
  							   SHARE_FORCE_DIR_MODE,
  							   SHARE_FORCE_DIR_MODE_DEFAULT);
  	pvfs->options.force_create_mode = share_int_option(scfg,
  							   SHARE_FORCE_CREATE_MODE,
  							   SHARE_FORCE_CREATE_MODE_DEFAULT);
  	/* this must be a power of 2 */
  	pvfs->alloc_size_rounding = share_int_option(scfg,
  							PVFS_ALLOCATION_ROUNDING,
  							PVFS_ALLOCATION_ROUNDING_DEFAULT);
  
  	pvfs->search.inactivity_time = share_int_option(scfg,
  							PVFS_SEARCH_INACTIVITY,
  							PVFS_SEARCH_INACTIVITY_DEFAULT);
  
  #if HAVE_XATTR_SUPPORT
  	if (share_bool_option(scfg, PVFS_XATTR, PVFS_XATTR_DEFAULT))
  		pvfs->flags |= PVFS_FLAG_XATTR_ENABLE;
  #endif
  
  	pvfs->sharing_violation_delay = share_int_option(scfg,
  							PVFS_SHARE_DELAY,
  							PVFS_SHARE_DELAY_DEFAULT);
  
  	pvfs->oplock_break_timeout = share_int_option(scfg,
  						      PVFS_OPLOCK_TIMEOUT,
  						      PVFS_OPLOCK_TIMEOUT_DEFAULT);
  
  	pvfs->writetime_delay = share_int_option(scfg,
  						 PVFS_WRITETIME_DELAY,
  						 PVFS_WRITETIME_DELAY_DEFAULT);
  
  	pvfs->share_name = talloc_strdup(pvfs, scfg->name);
  
  	pvfs->fs_attribs = 
  		FS_ATTR_CASE_SENSITIVE_SEARCH | 
  		FS_ATTR_CASE_PRESERVED_NAMES |
  		FS_ATTR_UNICODE_ON_DISK |
  		FS_ATTR_SPARSE_FILES;
  
  	/* allow xattrs to be stored in a external tdb */
  	eadb = share_string_option(scfg, PVFS_EADB, NULL);
  	if (eadb != NULL) {
  		pvfs->ea_db = tdb_wrap_open(pvfs, eadb, 50000,  
  					    TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
  		if (pvfs->ea_db != NULL) {
  			pvfs->flags |= PVFS_FLAG_XATTR_ENABLE;
  		} else {
  			DEBUG(0,("Failed to open eadb '%s' - %s\n",
  				 eadb, strerror(errno)));
  			pvfs->flags &= ~PVFS_FLAG_XATTR_ENABLE;
  		}
  	}
  
  	if (pvfs->flags & PVFS_FLAG_XATTR_ENABLE) {
  		pvfs->fs_attribs |= FS_ATTR_NAMED_STREAMS;
  	}
  	if (pvfs->flags & PVFS_FLAG_XATTR_ENABLE) {
  		pvfs->fs_attribs |= FS_ATTR_PERSISTANT_ACLS;
  	}
  
  	pvfs->sid_cache.creator_owner = dom_sid_parse_talloc(pvfs, SID_CREATOR_OWNER);
  	pvfs->sid_cache.creator_group = dom_sid_parse_talloc(pvfs, SID_CREATOR_GROUP);
  
  	/* check if the system really supports xattrs */
  	if (pvfs->flags & PVFS_FLAG_XATTR_ENABLE) {
  		pvfs_xattr_probe(pvfs);
  	}
  
  	/* enable an ACL backend */
  	pvfs->acl_ops = pvfs_acl_backend_byname(share_string_option(scfg, PVFS_ACL, "xattr"));
  }
  
  static int pvfs_state_destructor(struct pvfs_state *pvfs)
  {
  	struct pvfs_file *f, *fn;
  	struct pvfs_search_state *s, *sn;
  
  	/* 
  	 * make sure we cleanup files and searches before anything else
  	 * because there destructors need to acess the pvfs_state struct
  	 */
  	for (f=pvfs->files.list; f; f=fn) {
  		fn = f->next;
  		talloc_free(f);
  	}
  
  	for (s=pvfs->search.list; s; s=sn) {
  		sn = s->next;
  		talloc_free(s);
  	}
  
  	return 0;
  }
  
  /*
    connect to a share - used when a tree_connect operation comes
    in. For a disk based backend we needs to ensure that the base
    directory exists (tho it doesn't need to be accessible by the user,
    that comes later)
  */
  static NTSTATUS pvfs_connect(struct ntvfs_module_context *ntvfs,
  			     struct ntvfs_request *req,
  			     union smb_tcon* tcon)
  {
  	struct pvfs_state *pvfs;
  	struct stat st;
  	char *base_directory;
  	NTSTATUS status;
  	const char *sharename;
  
  	switch (tcon->generic.level) {
  	case RAW_TCON_TCON:
  		sharename = tcon->tcon.in.service;
  		break;
  	case RAW_TCON_TCONX:
  		sharename = tcon->tconx.in.path;
  		break;
  	case RAW_TCON_SMB2:
  		sharename = tcon->smb2.in.path;
  		break;
  	default:
  		return NT_STATUS_INVALID_LEVEL;
  	}
  
  	if (strncmp(sharename, "\\\\", 2) == 0) {
  		char *p = strchr(sharename+2, '\\');
  		if (p) {
  			sharename = p + 1;
  		}
  	}
  
  	/*
  	 * TODO: call this from ntvfs_posix_init()
  	 *       but currently we don't have a lp_ctx there
  	 */
  	status = pvfs_acl_init(ntvfs->ctx->lp_ctx);
  	NT_STATUS_NOT_OK_RETURN(status);
  
  	pvfs = talloc_zero(ntvfs, struct pvfs_state);
  	NT_STATUS_HAVE_NO_MEMORY(pvfs);
  
  	/* for simplicity of path construction, remove any trailing slash now */
  	base_directory = talloc_strdup(pvfs, share_string_option(ntvfs->ctx->config, SHARE_PATH, ""));
  	NT_STATUS_HAVE_NO_MEMORY(base_directory);
  	if (strcmp(base_directory, "/") != 0) {
  		trim_string(base_directory, NULL, "/");
  	}
  
  	pvfs->ntvfs = ntvfs;
  	pvfs->base_directory = base_directory;
  
  	/* the directory must exist. Note that we deliberately don't
  	   check that it is readable */
  	if (stat(pvfs->base_directory, &st) != 0 || !S_ISDIR(st.st_mode)) {
  		DEBUG(0,("pvfs_connect: '%s' is not a directory, when connecting to [%s]\n", 
  			 pvfs->base_directory, sharename));
  		return NT_STATUS_BAD_NETWORK_NAME;
  	}
  
  	ntvfs->ctx->fs_type = talloc_strdup(ntvfs->ctx, "NTFS");
  	NT_STATUS_HAVE_NO_MEMORY(ntvfs->ctx->fs_type);
  
  	ntvfs->ctx->dev_type = talloc_strdup(ntvfs->ctx, "A:");
  	NT_STATUS_HAVE_NO_MEMORY(ntvfs->ctx->dev_type);
  
  	if (tcon->generic.level == RAW_TCON_TCONX) {
  		tcon->tconx.out.fs_type = ntvfs->ctx->fs_type;
  		tcon->tconx.out.dev_type = ntvfs->ctx->dev_type;
  	}
  
  	ntvfs->private_data = pvfs;
  
  	pvfs->brl_context = brl_init(pvfs, 
  				     pvfs->ntvfs->ctx->server_id,
  				     pvfs->ntvfs->ctx->lp_ctx,
  				     pvfs->ntvfs->ctx->msg_ctx);
  	if (pvfs->brl_context == NULL) {
  		return NT_STATUS_INTERNAL_DB_CORRUPTION;
  	}
  
  	pvfs->odb_context = odb_init(pvfs, pvfs->ntvfs->ctx);
  	if (pvfs->odb_context == NULL) {
  		return NT_STATUS_INTERNAL_DB_CORRUPTION;
  	}
  
  	/* allow this to be NULL - we just disable change notify */
  	pvfs->notify_context = notify_init(pvfs, 
  					   pvfs->ntvfs->ctx->server_id,  
  					   pvfs->ntvfs->ctx->msg_ctx, 
  					   pvfs->ntvfs->ctx->lp_ctx,
  					   pvfs->ntvfs->ctx->event_ctx,
  					   pvfs->ntvfs->ctx->config);
  
  	pvfs->wbc_ctx = wbc_init(pvfs,
  				 pvfs->ntvfs->ctx->msg_ctx,
  				 pvfs->ntvfs->ctx->event_ctx);
  	if (pvfs->wbc_ctx == NULL) {
  		return NT_STATUS_INTERNAL_DB_CORRUPTION;
  	}
  
  	/* allocate the search handle -> ptr tree */
  	pvfs->search.idtree = idr_init(pvfs);
  	NT_STATUS_HAVE_NO_MEMORY(pvfs->search.idtree);
  
  	status = pvfs_mangle_init(pvfs);
  	NT_STATUS_NOT_OK_RETURN(status);
  
  	pvfs_setup_options(pvfs);
  
  	talloc_set_destructor(pvfs, pvfs_state_destructor);
  
  #ifdef SIGXFSZ
  	/* who had the stupid idea to generate a signal on a large
  	   file write instead of just failing it!? */
  	BlockSignals(true, SIGXFSZ);
  #endif
  
  	return NT_STATUS_OK;
  }
  
  /*
    disconnect from a share
  */
  static NTSTATUS pvfs_disconnect(struct ntvfs_module_context *ntvfs)
  {
  	return NT_STATUS_OK;
  }
  
  /*
    check if a directory exists
  */
  static NTSTATUS pvfs_chkpath(struct ntvfs_module_context *ntvfs,
  			     struct ntvfs_request *req,
  			     union smb_chkpath *cp)
  {
  	struct pvfs_state *pvfs = talloc_get_type(ntvfs->private_data,
  				  struct pvfs_state);
  	struct pvfs_filename *name;
  	NTSTATUS status;
  
  	/* resolve the cifs name to a posix name */
  	status = pvfs_resolve_name(pvfs, req, cp->chkpath.in.path, 0, &name);
  	NT_STATUS_NOT_OK_RETURN(status);
  
  	if (!name->exists) {
  		return NT_STATUS_OBJECT_NAME_NOT_FOUND;
  	}
  
  	if (!S_ISDIR(name->st.st_mode)) {
  		return NT_STATUS_NOT_A_DIRECTORY;
  	}
  
  	return NT_STATUS_OK;
  }
  
  /*
    copy a set of files
  */
  static NTSTATUS pvfs_copy(struct ntvfs_module_context *ntvfs,
  			  struct ntvfs_request *req, struct smb_copy *cp)
  {
  	DEBUG(0,("pvfs_copy not implemented\n"));
  	return NT_STATUS_NOT_SUPPORTED;
  }
  
  /*
    return print queue info
  */
  static NTSTATUS pvfs_lpq(struct ntvfs_module_context *ntvfs,
  			 struct ntvfs_request *req, union smb_lpq *lpq)
  {
  	return NT_STATUS_NOT_SUPPORTED;
  }
  
  /* SMBtrans - not used on file shares */
  static NTSTATUS pvfs_trans(struct ntvfs_module_context *ntvfs,
  			   struct ntvfs_request *req, struct smb_trans2 *trans2)
  {
  	return NT_STATUS_ACCESS_DENIED;
  }
  
  /*
    initialialise the POSIX disk backend, registering ourselves with the ntvfs subsystem
   */
  NTSTATUS ntvfs_posix_init(void)
  {
  	NTSTATUS ret;
  	struct ntvfs_ops ops;
  	NTVFS_CURRENT_CRITICAL_SIZES(vers);
  
  	ZERO_STRUCT(ops);
  
  	ops.type = NTVFS_DISK;
  	
  	/* fill in all the operations */
  	ops.connect = pvfs_connect;
  	ops.disconnect = pvfs_disconnect;
  	ops.unlink = pvfs_unlink;
  	ops.chkpath = pvfs_chkpath;
  	ops.qpathinfo = pvfs_qpathinfo;
  	ops.setpathinfo = pvfs_setpathinfo;
  	ops.open = pvfs_open;
  	ops.mkdir = pvfs_mkdir;
  	ops.rmdir = pvfs_rmdir;
  	ops.rename = pvfs_rename;
  	ops.copy = pvfs_copy;
  	ops.ioctl = pvfs_ioctl;
  	ops.read = pvfs_read;
  	ops.write = pvfs_write;
  	ops.seek = pvfs_seek;
  	ops.flush = pvfs_flush;	
  	ops.close = pvfs_close;
  	ops.exit = pvfs_exit;
  	ops.lock = pvfs_lock;
  	ops.setfileinfo = pvfs_setfileinfo;
  	ops.qfileinfo = pvfs_qfileinfo;
  	ops.fsinfo = pvfs_fsinfo;
  	ops.lpq = pvfs_lpq;
  	ops.search_first = pvfs_search_first;
  	ops.search_next = pvfs_search_next;
  	ops.search_close = pvfs_search_close;
  	ops.trans = pvfs_trans;
  	ops.logoff = pvfs_logoff;
  	ops.async_setup = pvfs_async_setup;
  	ops.cancel = pvfs_cancel;
  	ops.notify = pvfs_notify;
  
  	/* register ourselves with the NTVFS subsystem. We register
  	   under the name 'default' as we wish to be the default
  	   backend, and also register as 'posix' */
  	ops.name = "default";
  	ret = ntvfs_register(&ops, &vers);
  
  	if (!NT_STATUS_IS_OK(ret)) {
  		DEBUG(0,("Failed to register POSIX backend as '%s'!\n", ops.name));
  	}
  
  	ops.name = "posix";
  	ret = ntvfs_register(&ops, &vers);
  
  	if (!NT_STATUS_IS_OK(ret)) {
  		DEBUG(0,("Failed to register POSIX backend as '%s'!\n", ops.name));
  	}
  
  	if (NT_STATUS_IS_OK(ret)) {
  		ret = ntvfs_common_init();
  	}
  
  	return ret;
  }
  