2 Unix SMB/CIFS implementation.
5 Copyright (C) Andrew Tridgell 2003
6 Copyright (C) Stefan (metze) Metzmacher 2004
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 2 of the License, or
11 (at your option) any later version.
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.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 this implements the core code for all NTVFS modules. Backends register themselves here.
27 #include "dlinklist.h"
28 #include "smb_server/smb_server.h"
32 /* the list of currently registered NTVFS backends, note that there
33 * can be more than one backend with the same name, as long as they
34 * have different typesx */
36 const struct ntvfs_ops *ops;
38 static int num_backends;
41 register a NTVFS backend.
43 The 'name' can be later used by other backends to find the operations
44 structure for this backend.
46 The 'type' is used to specify whether this is for a disk, printer or IPC$ share
48 static NTSTATUS ntvfs_register(const void *_ops)
50 const struct ntvfs_ops *ops = _ops;
51 struct ntvfs_ops *new_ops;
53 if (ntvfs_backend_byname(ops->name, ops->type) != NULL) {
54 /* its already registered! */
55 DEBUG(0,("NTVFS backend '%s' for type %d already registered\n",
56 ops->name, (int)ops->type));
57 return NT_STATUS_OBJECT_NAME_COLLISION;
60 backends = Realloc(backends, sizeof(backends[0]) * (num_backends+1));
62 smb_panic("out of memory in ntvfs_register");
65 new_ops = smb_xmemdup(ops, sizeof(*ops));
66 new_ops->name = smb_xstrdup(ops->name);
68 backends[num_backends].ops = new_ops;
72 DEBUG(3,("NTVFS backend '%s' for type %d registered\n",
73 ops->name,ops->type));
80 return the operations structure for a named backend of the specified type
82 const struct ntvfs_ops *ntvfs_backend_byname(const char *name, enum ntvfs_type type)
86 for (i=0;i<num_backends;i++) {
87 if (backends[i].ops->type == type &&
88 strcmp(backends[i].ops->name, name) == 0) {
89 return backends[i].ops;
98 return the NTVFS interface version, and the size of some critical types
99 This can be used by backends to either detect compilation errors, or provide
100 multiple implementations for different smbd compilation options in one module
102 const struct ntvfs_critical_sizes *ntvfs_interface_version(void)
104 static const struct ntvfs_critical_sizes critical_sizes = {
105 NTVFS_INTERFACE_VERSION,
106 sizeof(struct ntvfs_critical_sizes),
107 sizeof(struct ntvfs_context),
108 sizeof(struct ntvfs_module_context),
109 sizeof(struct ntvfs_ops),
110 sizeof(struct ntvfs_async_state),
111 sizeof(struct smbsrv_tcon),
112 sizeof(struct smbsrv_request),
115 return &critical_sizes;
120 initialise the NTVFS subsystem
122 BOOL ntvfs_init(void)
126 status = register_subsystem("ntvfs", ntvfs_register);
127 if (!NT_STATUS_IS_OK(status)) {
131 /* FIXME: Perhaps panic if a basic backend, such as IPC, fails to initialise? */
134 DEBUG(3,("NTVFS subsystem version %d initialised\n", NTVFS_INTERFACE_VERSION));
140 initialise a connection structure to point at a NTVFS backend
142 NTSTATUS ntvfs_init_connection(struct smbsrv_request *req, enum ntvfs_type type)
144 const char **handlers = lp_ntvfs_handler(req->tcon->service);
146 struct ntvfs_context *ctx;
149 return NT_STATUS_FOOBAR;
152 ctx = talloc_p(req->tcon, struct ntvfs_context);
154 return NT_STATUS_NO_MEMORY;
159 for (i=0; handlers[i]; i++) {
160 struct ntvfs_module_context *ntvfs;
162 ntvfs = talloc_p(ctx, struct ntvfs_module_context);
164 return NT_STATUS_NO_MEMORY;
167 ntvfs->ops = ntvfs_backend_byname(handlers[i], ctx->type);
169 DEBUG(1,("ntvfs_init_connection: failed to find backend=%s, type=%d\n",
170 handlers[i], ctx->type));
171 return NT_STATUS_UNSUCCESSFUL;
174 DLIST_ADD_END(ctx->modules, ntvfs, struct ntvfs_module_context *);
179 return NT_STATUS_FOOBAR;
182 req->tcon->ntvfs_ctx = ctx;