Line data Source code
1 : /*
2 : Unix SMB/CIFS implementation.
3 : NTVFS base code
4 :
5 : Copyright (C) Andrew Tridgell 2003
6 : Copyright (C) Stefan (metze) Metzmacher 2004
7 :
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 3 of the License, or
11 : (at your option) any later version.
12 :
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.
17 :
18 : You should have received a copy of the GNU General Public License
19 : along with this program. If not, see <http://www.gnu.org/licenses/>.
20 : */
21 : /*
22 : this implements the core code for all NTVFS modules. Backends register themselves here.
23 : */
24 :
25 : #include "includes.h"
26 : #include "../lib/util/dlinklist.h"
27 : #include "ntvfs/ntvfs.h"
28 : #include "param/param.h"
29 : #include "lib/util/samba_modules.h"
30 :
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;
36 : } *backends = NULL;
37 : static int num_backends;
38 :
39 : /*
40 : register a NTVFS backend.
41 :
42 : The 'name' can be later used by other backends to find the operations
43 : structure for this backend.
44 :
45 : The 'type' is used to specify whether this is for a disk, printer or IPC$ share
46 : */
47 544 : NTSTATUS ntvfs_register(const struct ntvfs_ops *ops,
48 : const struct ntvfs_critical_sizes *const sizes)
49 : {
50 24 : struct ntvfs_ops *new_ops;
51 :
52 544 : if (ntvfs_interface_differs(sizes)) {
53 0 : DEBUG(0, ("NTVFS backend '%s' for type %d "
54 : "failed version check\n",
55 : ops->name, (int)ops->type));
56 0 : return NT_STATUS_BAD_FUNCTION_TABLE;
57 : }
58 :
59 544 : if (ntvfs_backend_byname(ops->name, ops->type) != NULL) {
60 : /* its already registered! */
61 0 : DEBUG(0,("NTVFS backend '%s' for type %d already registered\n",
62 : ops->name, (int)ops->type));
63 0 : return NT_STATUS_OBJECT_NAME_COLLISION;
64 : }
65 :
66 544 : backends = realloc_p(backends, struct ntvfs_backend, num_backends+1);
67 544 : if (!backends) {
68 0 : smb_panic("out of memory in ntvfs_register");
69 : }
70 :
71 544 : new_ops = smb_xmemdup(ops, sizeof(*ops));
72 544 : new_ops->name = smb_xstrdup(ops->name);
73 :
74 544 : backends[num_backends].ops = new_ops;
75 :
76 544 : num_backends++;
77 :
78 544 : DEBUG(3,("NTVFS backend '%s' for type %d registered\n",
79 : ops->name,ops->type));
80 :
81 544 : return NT_STATUS_OK;
82 : }
83 :
84 :
85 : /*
86 : return the operations structure for a named backend of the specified type
87 : */
88 4427 : const struct ntvfs_ops *ntvfs_backend_byname(const char *name, enum ntvfs_type type)
89 : {
90 24 : int i;
91 :
92 17262 : for (i=0;i<num_backends;i++) {
93 16718 : if (backends[i].ops->type == type &&
94 8832 : strcmp(backends[i].ops->name, name) == 0) {
95 3883 : return backends[i].ops;
96 : }
97 : }
98 :
99 520 : return NULL;
100 : }
101 :
102 :
103 : /*
104 : return the NTVFS interface version, and the size of some critical types
105 : This can be used by backends to either detect compilation errors, or provide
106 : multiple implementations for different smbd compilation options in one module
107 : */
108 :
109 : static const NTVFS_CURRENT_CRITICAL_SIZES(critical_sizes);
110 :
111 0 : const struct ntvfs_critical_sizes *ntvfs_interface_version(void)
112 : {
113 0 : return &critical_sizes;
114 : }
115 :
116 544 : bool ntvfs_interface_differs(const struct ntvfs_critical_sizes *const iface)
117 : {
118 : /* The comparison would be easier with memcmp, but compiler-interset
119 : * alignment padding is not guaranteed to be zeroed.
120 : */
121 :
122 : #define FIELD_DIFFERS(field) (iface->field != critical_sizes.field)
123 :
124 544 : if (FIELD_DIFFERS(interface_version))
125 0 : return true;
126 :
127 544 : if (FIELD_DIFFERS(sizeof_ntvfs_critical_sizes))
128 0 : return true;
129 :
130 544 : if (FIELD_DIFFERS(sizeof_ntvfs_context))
131 0 : return true;
132 :
133 544 : if (FIELD_DIFFERS(sizeof_ntvfs_module_context))
134 0 : return true;
135 :
136 544 : if (FIELD_DIFFERS(sizeof_ntvfs_ops))
137 0 : return true;
138 :
139 544 : if (FIELD_DIFFERS(sizeof_ntvfs_async_state))
140 0 : return true;
141 :
142 544 : if (FIELD_DIFFERS(sizeof_ntvfs_request))
143 0 : return true;
144 :
145 : /* Versions match. */
146 520 : return false;
147 :
148 : #undef FIELD_DIFFERS
149 : }
150 :
151 : /*
152 : initialise a connection structure to point at a NTVFS backend
153 : */
154 2555 : NTSTATUS ntvfs_init_connection(TALLOC_CTX *mem_ctx, struct share_config *scfg, enum ntvfs_type type,
155 : enum protocol_types protocol,
156 : uint64_t ntvfs_client_caps,
157 : struct tevent_context *ev, struct imessaging_context *msg,
158 : struct loadparm_context *lp_ctx,
159 : struct server_id server_id, struct ntvfs_context **_ctx)
160 : {
161 2555 : const char **handlers = share_string_list_option(mem_ctx, scfg, SHARE_NTVFS_HANDLER);
162 0 : int i;
163 0 : struct ntvfs_context *ctx;
164 :
165 2555 : if (!handlers) {
166 0 : return NT_STATUS_INTERNAL_ERROR;
167 : }
168 :
169 2555 : ctx = talloc_zero(mem_ctx, struct ntvfs_context);
170 2555 : NT_STATUS_HAVE_NO_MEMORY(ctx);
171 2555 : ctx->protocol = protocol;
172 2555 : ctx->client_caps = ntvfs_client_caps;
173 2555 : ctx->type = type;
174 2555 : ctx->config = talloc_steal(ctx, scfg);
175 2555 : ctx->event_ctx = ev;
176 2555 : ctx->msg_ctx = msg;
177 2555 : ctx->server_id = server_id;
178 2555 : ctx->lp_ctx = lp_ctx;
179 :
180 6438 : for (i=0; handlers[i]; i++) {
181 0 : struct ntvfs_module_context *ntvfs;
182 :
183 3883 : ntvfs = talloc_zero(ctx, struct ntvfs_module_context);
184 3883 : NT_STATUS_HAVE_NO_MEMORY(ntvfs);
185 3883 : ntvfs->ctx = ctx;
186 3883 : ntvfs->ops = ntvfs_backend_byname(handlers[i], ctx->type);
187 3883 : if (!ntvfs->ops) {
188 0 : DEBUG(1,("ntvfs_init_connection: failed to find backend=%s, type=%d\n",
189 : handlers[i], ctx->type));
190 0 : return NT_STATUS_INTERNAL_ERROR;
191 : }
192 3883 : ntvfs->depth = i;
193 3883 : DLIST_ADD_END(ctx->modules, ntvfs);
194 : }
195 :
196 2555 : if (!ctx->modules) {
197 0 : return NT_STATUS_INTERNAL_ERROR;
198 : }
199 :
200 2555 : *_ctx = ctx;
201 2555 : return NT_STATUS_OK;
202 : }
203 :
204 : /*
205 : adds the IPC$ share, needed for RPC calls
206 : */
207 68 : static NTSTATUS ntvfs_add_ipc_share(struct loadparm_context *lp_ctx)
208 : {
209 3 : struct loadparm_service *ipc;
210 :
211 68 : if (lpcfg_service(lp_ctx, "IPC$")) {
212 : /* it has already been defined in smb.conf or elsewhere */
213 0 : return NT_STATUS_OK;
214 : }
215 :
216 68 : ipc = lpcfg_add_service(lp_ctx, NULL, "IPC$");
217 68 : NT_STATUS_HAVE_NO_MEMORY(ipc);
218 :
219 68 : lpcfg_do_service_parameter(lp_ctx, ipc, "comment", "IPC Service");
220 68 : lpcfg_do_service_parameter(lp_ctx, ipc, "path", "/dev/null");
221 68 : lpcfg_do_service_parameter(lp_ctx, ipc, "ntvfs handler", "default");
222 68 : lpcfg_do_service_parameter(lp_ctx, ipc, "browseable", "No");
223 68 : lpcfg_do_service_parameter(lp_ctx, ipc, "fstype", "IPC");
224 :
225 68 : return NT_STATUS_OK;
226 : }
227 :
228 68 : NTSTATUS ntvfs_init(struct loadparm_context *lp_ctx)
229 : {
230 3 : static bool initialized = false;
231 : #define _MODULE_PROTO(init) extern NTSTATUS init(TALLOC_CTX *);
232 3 : STATIC_ntvfs_MODULES_PROTO;
233 68 : init_module_fn static_init[] = { STATIC_ntvfs_MODULES };
234 3 : init_module_fn *shared_init;
235 :
236 68 : if (initialized) return NT_STATUS_OK;
237 68 : initialized = true;
238 :
239 68 : shared_init = load_samba_modules(NULL, "ntvfs");
240 :
241 68 : run_init_functions(NULL, static_init);
242 68 : run_init_functions(NULL, shared_init);
243 :
244 68 : talloc_free(shared_init);
245 :
246 68 : ntvfs_add_ipc_share(lp_ctx);
247 :
248 68 : return NT_STATUS_OK;
249 : }
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