1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
/*
Unix SMB/CIFS implementation.
module loading system
Copyright (C) Jelmer Vernooij 2002-2003
Copyright (C) Stefan (metze) Metzmacher 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.
*/
#include "includes.h"
#ifdef HAVE_DLOPEN
/* Load a dynamic module. Only log a level 0 error if we are not checking
for the existence of a module (probling). */
static NTSTATUS do_smb_load_module(const char *module_name, BOOL is_probe)
{
void *handle;
init_module_function *init;
NTSTATUS status;
const char *error;
/* Always try to use LAZY symbol resolving; if the plugin has
* backwards compatibility, there might be symbols in the
* plugin referencing to old (removed) functions
*/
handle = sys_dlopen(module_name, RTLD_LAZY);
/* This call should reset any possible non-fatal errors that
occured since last call to dl* functions */
error = sys_dlerror();
if(!handle) {
int level = is_probe ? 3 : 0;
DEBUG(level, ("Error loading module '%s': %s\n", module_name, error ? error : ""));
return NT_STATUS_UNSUCCESSFUL;
}
init = (init_module_function *)sys_dlsym(handle, "init_module");
/* we must check sys_dlerror() to determine if it worked, because
sys_dlsym() can validly return NULL */
error = sys_dlerror();
if (error) {
DEBUG(0, ("Error trying to resolve symbol 'init_module' in %s: %s\n",
module_name, error));
return NT_STATUS_UNSUCCESSFUL;
}
DEBUG(2, ("Module '%s' loaded\n", module_name));
status = init();
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("Module '%s' initialization failed: %s\n",
module_name, get_friendly_nt_error_msg(status)));
}
return status;
}
NTSTATUS smb_load_module(const char *module_name)
{
return do_smb_load_module(module_name, False);
}
/* Load all modules in list and return number of
* modules that has been successfully loaded */
int smb_load_modules(const char **modules)
{
int i;
int success = 0;
for(i = 0; modules[i]; i++){
if(NT_STATUS_IS_OK(smb_load_module(modules[i]))) {
success++;
}
}
DEBUG(2, ("%d modules successfully loaded\n", success));
return success;
}
NTSTATUS smb_probe_module(const char *subsystem, const char *module)
{
pstring full_path;
/* Check for absolute path */
/* if we make any 'samba multibyte string'
calls here, we break
for loading string modules */
DEBUG(5, ("Probing module '%s'\n", module));
if (module[0] == '/')
return do_smb_load_module(module, True);
pstrcpy(full_path, lib_path(subsystem));
pstrcat(full_path, "/");
pstrcat(full_path, module);
pstrcat(full_path, ".");
pstrcat(full_path, shlib_ext());
DEBUG(5, ("Probing module '%s': Trying to load from %s\n", module, full_path));
return do_smb_load_module(full_path, True);
}
#else /* HAVE_DLOPEN */
NTSTATUS smb_load_module(const char *module_name)
{
DEBUG(0,("This samba executable has not been built with plugin support\n"));
return NT_STATUS_NOT_SUPPORTED;
}
int smb_load_modules(const char **modules)
{
DEBUG(0,("This samba executable has not been built with plugin support\n"));
return -1;
}
NTSTATUS smb_probe_module(const char *subsystem, const char *module)
{
DEBUG(0,("This samba executable has not been built with plugin support, not probing\n"));
return NT_STATUS_NOT_SUPPORTED;
}
#endif /* HAVE_DLOPEN */
void init_modules(void)
{
/* FIXME: This can cause undefined symbol errors :
* smb_register_vfs() isn't available in nmbd, for example */
if(lp_preload_modules())
smb_load_modules(lp_preload_modules());
}
/***************************************************************************
* This Function registers a idle event
*
* the registered funtions are run periodically
* and maybe shutdown idle connections (e.g. to an LDAP server)
***************************************************************************/
static smb_event_id_t smb_idle_event_id = 1;
struct smb_idle_list_ent {
struct smb_idle_list_ent *prev,*next;
smb_event_id_t id;
smb_idle_event_fn *fn;
void *data;
time_t interval;
time_t lastrun;
};
static struct smb_idle_list_ent *smb_idle_event_list = NULL;
smb_event_id_t smb_register_idle_event(smb_idle_event_fn *fn, void *data, time_t interval)
{
struct smb_idle_list_ent *event;
if (!fn) {
return SMB_EVENT_ID_INVALID;
}
event = SMB_MALLOC_P(struct smb_idle_list_ent);
if (!event) {
DEBUG(0,("malloc() failed!\n"));
return SMB_EVENT_ID_INVALID;
}
event->fn = fn;
event->data = data;
event->interval = interval;
event->lastrun = 0;
event->id = smb_idle_event_id++;
DLIST_ADD(smb_idle_event_list,event);
return event->id;
}
BOOL smb_unregister_idle_event(smb_event_id_t id)
{
struct smb_idle_list_ent *event = smb_idle_event_list;
while(event) {
if (event->id == id) {
DLIST_REMOVE(smb_idle_event_list,event);
SAFE_FREE(event);
return True;
}
event = event->next;
}
return False;
}
void smb_run_idle_events(time_t now)
{
struct smb_idle_list_ent *event = smb_idle_event_list;
while (event) {
struct smb_idle_list_ent *next = event->next;
time_t interval;
if (event->interval <= 0) {
interval = SMB_IDLE_EVENT_DEFAULT_INTERVAL;
} else if (event->interval >= SMB_IDLE_EVENT_MIN_INTERVAL) {
interval = event->interval;
} else {
interval = SMB_IDLE_EVENT_MIN_INTERVAL;
}
if (now >(event->lastrun+interval)) {
event->lastrun = now;
event->fn(&event->data,&event->interval,now);
}
event = next;
}
return;
}
|
