1 files changed, 249 insertions, 0 deletions
diff --git a/source4/ntvfs/ntvfs_base.c b/source4/ntvfs/ntvfs_base.c
new file mode 100644
index 0000000..5c438bb
--- /dev/null
+++ b/source4/ntvfs/ntvfs_base.c
@@ -0,0 +1,249 @@
+/* 
+   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 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 the core code for all NTVFS modules. Backends register themselves here.
+*/
+
+#include "includes.h"
+#include "../lib/util/dlinklist.h"
+#include "ntvfs/ntvfs.h"
+#include "param/param.h"
+#include "lib/util/samba_modules.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 ntvfs_backend {
+	const struct ntvfs_ops *ops;
+} *backends = NULL;
+static int num_backends;
+
+/*
+  register a NTVFS backend. 
+
+  The 'name' can be later used by other backends to find the operations
+  structure for this backend.  
+
+  The 'type' is used to specify whether this is for a disk, printer or IPC$ share
+*/
+NTSTATUS ntvfs_register(const struct ntvfs_ops *ops,
+				 const struct ntvfs_critical_sizes *const sizes)
+{
+	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(0,("NTVFS backend '%s' for type %d already registered\n", 
+			 ops->name, (int)ops->type));
+		return NT_STATUS_OBJECT_NAME_COLLISION;
+	}
+
+	backends = realloc_p(backends, struct ntvfs_backend, num_backends+1);
+	if (!backends) {
+		smb_panic("out of memory in ntvfs_register");
+	}
+
+	new_ops = smb_xmemdup(ops, sizeof(*ops));
+	new_ops->name = smb_xstrdup(ops->name);
+
+	backends[num_backends].ops = new_ops;
+
+	num_backends++;
+
+	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
+*/
+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].ops->type == type && 
+		    strcmp(backends[i].ops->name, name) == 0) {
+			return backends[i].ops;
+		}
+	}
+
+	return NULL;
+}
+
+
+/*
+  return the NTVFS interface version, and the size of some critical types
+  This can be used by backends to either detect compilation errors, or provide
+  multiple implementations for different smbd compilation options in one module
+*/
+
+static const NTVFS_CURRENT_CRITICAL_SIZES(critical_sizes);
+
+const struct ntvfs_critical_sizes *ntvfs_interface_version(void)
+{
+	return &critical_sizes;
+}
+
+bool ntvfs_interface_differs(const struct ntvfs_critical_sizes *const iface)
+{
+	/* The comparison would be easier with memcmp, but compiler-interset
+	 * alignment padding is not guaranteed to be zeroed.
+	 */
+
+#define FIELD_DIFFERS(field) (iface->field != critical_sizes.field)
+
+	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(TALLOC_CTX *mem_ctx, struct share_config *scfg, enum ntvfs_type type,
+			       enum protocol_types protocol,
+			       uint64_t ntvfs_client_caps,
+			       struct tevent_context *ev, struct imessaging_context *msg,
+			       struct loadparm_context *lp_ctx,
+			       struct server_id server_id, struct ntvfs_context **_ctx)
+{
+	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;
+	}
+
+	ctx = talloc_zero(mem_ctx, struct ntvfs_context);
+	NT_STATUS_HAVE_NO_MEMORY(ctx);
+	ctx->protocol		= protocol;
+	ctx->client_caps	= ntvfs_client_caps;
+	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);
+	}
+
+	if (!ctx->modules) {
+		return NT_STATUS_INTERNAL_ERROR;
+	}
+
+	*_ctx = ctx;
+	return NT_STATUS_OK;
+}
+
+/*
+  adds the IPC$ share, needed for RPC calls
+ */
+static NTSTATUS ntvfs_add_ipc_share(struct loadparm_context *lp_ctx)
+{
+	struct loadparm_service *ipc;
+
+	if (lpcfg_service(lp_ctx, "IPC$")) {
+		/* it has already been defined in smb.conf or elsewhere */
+		return NT_STATUS_OK;
+	}
+
+	ipc = lpcfg_add_service(lp_ctx, NULL, "IPC$");
+	NT_STATUS_HAVE_NO_MEMORY(ipc);
+
+	lpcfg_do_service_parameter(lp_ctx, ipc, "comment", "IPC Service");
+	lpcfg_do_service_parameter(lp_ctx, ipc, "path", "/dev/null");
+	lpcfg_do_service_parameter(lp_ctx, ipc, "ntvfs handler", "default");
+	lpcfg_do_service_parameter(lp_ctx, ipc, "browseable", "No");
+	lpcfg_do_service_parameter(lp_ctx, ipc, "fstype", "IPC");
+
+	return NT_STATUS_OK;
+}
+
+NTSTATUS ntvfs_init(struct loadparm_context *lp_ctx)
+{
+	static bool initialized = false;
+#define _MODULE_PROTO(init) extern NTSTATUS init(TALLOC_CTX *);
+	STATIC_ntvfs_MODULES_PROTO;
+	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, "ntvfs");
+
+	run_init_functions(NULL, static_init);
+	run_init_functions(NULL, shared_init);
+
+	talloc_free(shared_init);
+
+	ntvfs_add_ipc_share(lp_ctx);
+	
+	return NT_STATUS_OK;
+}