/*
Unix SMB/CIFS implementation.
NTVFS base code
+
Copyright (C) Andrew Tridgell 2003
+ Copyright (C) Stefan (metze) Metzmacher 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 2 of the License, or
+ 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,
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, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
this implements the core code for all NTVFS modules. Backends register themselves here.
*/
#include "includes.h"
-
+#include "lib/util/dlinklist.h"
+#include "build.h"
+#include "ntvfs/ntvfs.h"
+#include "param/param.h"
/* the list of currently registered NTVFS backends, note that there
* can be more than one backend with the same name, as long as they
* have different typesx */
-static struct {
- const char *name;
- enum ntvfs_type type;
- struct ntvfs_ops *ops;
+static struct ntvfs_backend {
+ const struct ntvfs_ops *ops;
} *backends = NULL;
static int num_backends;
The 'type' is used to specify whether this is for a disk, printer or IPC$ share
*/
-BOOL ntvfs_register(const char *name, enum ntvfs_type type, struct ntvfs_ops *ops)
+_PUBLIC_ NTSTATUS ntvfs_register(const struct ntvfs_ops *ops,
+ const struct ntvfs_critical_sizes *const sizes)
{
- if (ntvfs_backend_byname(name, type) != NULL) {
+ struct ntvfs_ops *new_ops;
+
+ if (ntvfs_interface_differs(sizes)) {
+ DEBUG(0, ("NTVFS backend '%s' for type %d "
+ "failed version check\n",
+ ops->name, (int)ops->type));
+ return NT_STATUS_BAD_FUNCTION_TABLE;
+ }
+
+ if (ntvfs_backend_byname(ops->name, ops->type) != NULL) {
/* its already registered! */
- DEBUG(2,("NTVFS backend '%s' for type %d already registered\n",
- name, (int)type));
- return False;
+ DEBUG(0,("NTVFS backend '%s' for type %d already registered\n",
+ ops->name, (int)ops->type));
+ return NT_STATUS_OBJECT_NAME_COLLISION;
}
- backends = Realloc(backends, sizeof(backends[0]) * (num_backends+1));
+ backends = realloc_p(backends, struct ntvfs_backend, num_backends+1);
if (!backends) {
smb_panic("out of memory in ntvfs_register");
}
- backends[num_backends].name = smb_xstrdup(name);
- backends[num_backends].type = type;
- backends[num_backends].ops = smb_xmemdup(ops, sizeof(*ops));
+ new_ops = smb_xmemdup(ops, sizeof(*ops));
+ new_ops->name = smb_xstrdup(ops->name);
+
+ backends[num_backends].ops = new_ops;
num_backends++;
- return True;
+ DEBUG(3,("NTVFS backend '%s' for type %d registered\n",
+ ops->name,ops->type));
+
+ return NT_STATUS_OK;
}
/*
return the operations structure for a named backend of the specified type
*/
-struct ntvfs_ops *ntvfs_backend_byname(const char *name, enum ntvfs_type type)
+_PUBLIC_ const struct ntvfs_ops *ntvfs_backend_byname(const char *name, enum ntvfs_type type)
{
int i;
for (i=0;i<num_backends;i++) {
- if (backends[i].type == type &&
- strcmp(backends[i].name, name) == 0) {
+ if (backends[i].ops->type == type &&
+ strcmp(backends[i].ops->name, name) == 0) {
return backends[i].ops;
}
}
This can be used by backends to either detect compilation errors, or provide
multiple implementations for different smbd compilation options in one module
*/
-int ntvfs_interface_version(struct ntvfs_critical_sizes *sizes)
-{
- sizes->sizeof_ntvfs_ops = sizeof(struct ntvfs_ops);
- sizes->sizeof_SMB_OFF_T = sizeof(SMB_OFF_T);
- sizes->sizeof_tcon_context = sizeof(struct tcon_context);
- sizes->sizeof_request_context = sizeof(struct request_context);
- return NTVFS_INTERFACE_VERSION;
-}
+static const NTVFS_CURRENT_CRITICAL_SIZES(critical_sizes);
+_PUBLIC_ const struct ntvfs_critical_sizes *ntvfs_interface_version(void)
+{
+ return &critical_sizes;
+}
-/*
- initialise the NTVFS subsystem
-*/
-BOOL ntvfs_init(void)
+_PUBLIC_ bool ntvfs_interface_differs(const struct ntvfs_critical_sizes *const iface)
{
- /* initialise our 3 basic backends. These are assumed to be
- * present and are always built in */
- if (!posix_vfs_init() ||
- !ipc_vfs_init() ||
- !print_vfs_init()) {
- return False;
- }
- /* initialize optional backends, e.g. CIFS. We allow failures here. */
- cifs_vfs_init();
+ /* The comparison would be easier with memcmp, but compiler-interset
+ * alignment padding is not guaranteed to be zeroed.
+ */
-#if WITH_NTVFS_STFS
- tank_vfs_init();
-#endif
+#define FIELD_DIFFERS(field) (iface->field != critical_sizes.field)
- DEBUG(3,("NTVFS version %d initialised\n", NTVFS_INTERFACE_VERSION));
- return True;
-}
+ if (FIELD_DIFFERS(interface_version))
+ return true;
+
+ if (FIELD_DIFFERS(sizeof_ntvfs_critical_sizes))
+ return true;
+
+ if (FIELD_DIFFERS(sizeof_ntvfs_context))
+ return true;
+
+ if (FIELD_DIFFERS(sizeof_ntvfs_module_context))
+ return true;
+
+ if (FIELD_DIFFERS(sizeof_ntvfs_ops))
+ return true;
+ if (FIELD_DIFFERS(sizeof_ntvfs_async_state))
+ return true;
+
+ if (FIELD_DIFFERS(sizeof_ntvfs_request))
+ return true;
+
+ /* Versions match. */
+ return false;
+
+#undef FIELD_DIFFERS
+}
/*
initialise a connection structure to point at a NTVFS backend
*/
-NTSTATUS ntvfs_init_connection(struct request_context *req)
+NTSTATUS ntvfs_init_connection(TALLOC_CTX *mem_ctx, struct share_config *scfg, enum ntvfs_type type,
+ enum protocol_types protocol,
+ struct event_context *ev, struct messaging_context *msg,
+ struct loadparm_context *lp_ctx,
+ struct server_id server_id, struct ntvfs_context **_ctx)
{
- const char *handler = lp_ntvfs_handler(req->conn->service);
-
- if (strequal(handler, "default"))
- handler = "ipc";
+ const char **handlers = share_string_list_option(mem_ctx, scfg, SHARE_NTVFS_HANDLER);
+ int i;
+ struct ntvfs_context *ctx;
+
+ if (!handlers) {
+ return NT_STATUS_INTERNAL_ERROR;
+ }
- req->conn->ntvfs_ops = ntvfs_backend_byname(handler, req->conn->type);
+ ctx = talloc_zero(mem_ctx, struct ntvfs_context);
+ NT_STATUS_HAVE_NO_MEMORY(ctx);
+ ctx->protocol = protocol;
+ ctx->type = type;
+ ctx->config = talloc_steal(ctx, scfg);
+ ctx->event_ctx = ev;
+ ctx->msg_ctx = msg;
+ ctx->server_id = server_id;
+ ctx->lp_ctx = lp_ctx;
+
+ for (i=0; handlers[i]; i++) {
+ struct ntvfs_module_context *ntvfs;
+
+ ntvfs = talloc_zero(ctx, struct ntvfs_module_context);
+ NT_STATUS_HAVE_NO_MEMORY(ntvfs);
+ ntvfs->ctx = ctx;
+ ntvfs->ops = ntvfs_backend_byname(handlers[i], ctx->type);
+ if (!ntvfs->ops) {
+ DEBUG(1,("ntvfs_init_connection: failed to find backend=%s, type=%d\n",
+ handlers[i], ctx->type));
+ return NT_STATUS_INTERNAL_ERROR;
+ }
+ ntvfs->depth = i;
+ DLIST_ADD_END(ctx->modules, ntvfs, struct ntvfs_module_context *);
+ }
- if (!req->conn->ntvfs_ops) {
- DEBUG(1,("ntvfs_init_connection: failed to find backend=%s, type=%d\n", handler, req->conn->type));
- return NT_STATUS_UNSUCCESSFUL;
+ if (!ctx->modules) {
+ return NT_STATUS_INTERNAL_ERROR;
}
+ *_ctx = ctx;
+ return NT_STATUS_OK;
+}
+
+NTSTATUS ntvfs_init(struct loadparm_context *lp_ctx)
+{
+ static bool initialized = false;
+ init_module_fn static_init[] = { STATIC_ntvfs_MODULES };
+ init_module_fn *shared_init;
+
+ if (initialized) return NT_STATUS_OK;
+ initialized = true;
+
+ shared_init = load_samba_modules(NULL, lp_ctx, "ntvfs");
+
+ run_init_functions(static_init);
+ run_init_functions(shared_init);
+
+ talloc_free(shared_init);
+
return NT_STATUS_OK;
}
git.samba.org / jelmer / samba4-debian.git / blobdiff