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-rw-r--r--source4/ntvfs/ntvfs_base.c145
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diff --git a/source4/ntvfs/ntvfs_base.c b/source4/ntvfs/ntvfs_base.c
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+/*
+ Unix SMB/CIFS implementation.
+ NTVFS base code
+ Copyright (C) Andrew Tridgell 2003
+
+ 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
+ (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, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+/*
+ this implements the core code for all NTVFS modules. Backends register themselves here.
+*/
+
+#include "includes.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;
+} *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
+*/
+BOOL ntvfs_register(const char *name, enum ntvfs_type type, struct ntvfs_ops *ops)
+{
+ if (ntvfs_backend_byname(name, type) != NULL) {
+ /* its already registered! */
+ DEBUG(2,("NTVFS backend '%s' for type %d already registered\n",
+ name, (int)type));
+ return False;
+ }
+
+ backends = Realloc(backends, sizeof(backends[0]) * (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));
+
+ num_backends++;
+
+ return True;
+}
+
+
+/*
+ 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)
+{
+ int i;
+
+ for (i=0;i<num_backends;i++) {
+ if (backends[i].type == type &&
+ strcmp(backends[i].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
+*/
+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;
+}
+
+
+/*
+ initialise the NTVFS subsystem
+*/
+BOOL ntvfs_init(void)
+{
+ /* 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();
+
+#if WITH_NTVFS_STFS
+ tank_vfs_init();
+#endif
+
+ DEBUG(3,("NTVFS version %d initialised\n", NTVFS_INTERFACE_VERSION));
+ return True;
+}
+
+
+/*
+ initialise a connection structure to point at a NTVFS backend
+*/
+NTSTATUS ntvfs_init_connection(struct request_context *req)
+{
+ const char *handler = lp_ntvfs_handler(req->conn->service);
+
+ if (strequal(handler, "default"))
+ handler = "ipc";
+
+ req->conn->ntvfs_ops = ntvfs_backend_byname(handler, req->conn->type);
+
+ 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;
+ }
+
+ return NT_STATUS_OK;
+}