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"
29 #include "ntvfs/ntvfs.h"
31 /* the list of currently registered NTVFS backends, note that there
32 * can be more than one backend with the same name, as long as they
33 * have different typesx */
34 static struct ntvfs_backend {
35 const struct ntvfs_ops *ops;
37 static int num_backends;
40 register a NTVFS backend.
42 The 'name' can be later used by other backends to find the operations
43 structure for this backend.
45 The 'type' is used to specify whether this is for a disk, printer or IPC$ share
47 _PUBLIC_ NTSTATUS ntvfs_register(const void *_ops)
49 const struct ntvfs_ops *ops = _ops;
50 struct ntvfs_ops *new_ops;
52 if (ntvfs_backend_byname(ops->name, ops->type) != NULL) {
53 /* its already registered! */
54 DEBUG(0,("NTVFS backend '%s' for type %d already registered\n",
55 ops->name, (int)ops->type));
56 return NT_STATUS_OBJECT_NAME_COLLISION;
59 backends = realloc_p(backends, struct ntvfs_backend, num_backends+1);
61 smb_panic("out of memory in ntvfs_register");
64 new_ops = smb_xmemdup(ops, sizeof(*ops));
65 new_ops->name = smb_xstrdup(ops->name);
67 backends[num_backends].ops = new_ops;
71 DEBUG(3,("NTVFS backend '%s' for type %d registered\n",
72 ops->name,ops->type));
79 return the operations structure for a named backend of the specified type
81 _PUBLIC_ const struct ntvfs_ops *ntvfs_backend_byname(const char *name, enum ntvfs_type type)
85 for (i=0;i<num_backends;i++) {
86 if (backends[i].ops->type == type &&
87 strcmp(backends[i].ops->name, name) == 0) {
88 return backends[i].ops;
97 return the NTVFS interface version, and the size of some critical types
98 This can be used by backends to either detect compilation errors, or provide
99 multiple implementations for different smbd compilation options in one module
101 static const struct ntvfs_critical_sizes critical_sizes = {
102 .interface_version = NTVFS_INTERFACE_VERSION,
103 .sizeof_ntvfs_critical_sizes = sizeof(struct ntvfs_critical_sizes),
104 .sizeof_ntvfs_context = sizeof(struct ntvfs_context),
105 .sizeof_ntvfs_module_context = sizeof(struct ntvfs_module_context),
106 .sizeof_ntvfs_ops = sizeof(struct ntvfs_ops),
107 .sizeof_ntvfs_async_state = sizeof(struct ntvfs_async_state),
108 .sizeof_ntvfs_request = sizeof(struct ntvfs_request),
111 _PUBLIC_ const struct ntvfs_critical_sizes *ntvfs_interface_version(void)
113 return &critical_sizes;
118 initialise a connection structure to point at a NTVFS backend
120 NTSTATUS ntvfs_init_connection(TALLOC_CTX *mem_ctx, int snum, enum ntvfs_type type,
121 enum protocol_types protocol,
122 struct event_context *ev, struct messaging_context *msg,
123 uint32_t server_id, struct ntvfs_context **_ctx)
125 const char **handlers = lp_ntvfs_handler(snum);
127 struct ntvfs_context *ctx;
130 return NT_STATUS_INTERNAL_ERROR;
133 ctx = talloc_zero(mem_ctx, struct ntvfs_context);
134 NT_STATUS_HAVE_NO_MEMORY(ctx);
135 ctx->protocol = protocol;
137 ctx->config.snum = snum;
140 ctx->server_id = server_id;
142 for (i=0; handlers[i]; i++) {
143 struct ntvfs_module_context *ntvfs;
145 ntvfs = talloc_zero(ctx, struct ntvfs_module_context);
146 NT_STATUS_HAVE_NO_MEMORY(ntvfs);
148 ntvfs->ops = ntvfs_backend_byname(handlers[i], ctx->type);
150 DEBUG(1,("ntvfs_init_connection: failed to find backend=%s, type=%d\n",
151 handlers[i], ctx->type));
152 return NT_STATUS_INTERNAL_ERROR;
155 DLIST_ADD_END(ctx->modules, ntvfs, struct ntvfs_module_context *);
159 return NT_STATUS_INTERNAL_ERROR;
166 NTSTATUS ntvfs_init(void)
168 init_module_fn static_init[] = STATIC_ntvfs_MODULES;
169 init_module_fn *shared_init = load_samba_modules(NULL, "ntvfs");
171 run_init_functions(static_init);
172 run_init_functions(shared_init);
174 talloc_free(shared_init);