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
|
/*
* Copyright (C) 2007 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*
* $Id$
*/
#include "plugin_loader.h"
#include <dlfcn.h>
#include <debug.h>
#include <utils/linked_list.h>
#include <plugins/plugin.h>
typedef struct private_plugin_loader_t private_plugin_loader_t;
/**
* private data of plugin_loader
*/
struct private_plugin_loader_t {
/**
* public functions
*/
plugin_loader_t public;
/**
* list of loaded plugins
*/
linked_list_t *plugins;
};
/**
* Implementation of plugin_loader_t.load_plugins.
*/
static int load(private_plugin_loader_t *this, char *path, char *prefix)
{
enumerator_t *enumerator;
char *file, *ending, *rel;
void *handle;
int count = 0;
enumerator = enumerator_create_directory(path);
if (!enumerator)
{
DBG1("opening plugin directory %s failed", path);
return 0;
}
DBG1("loading plugins from %s", path);
while (enumerator->enumerate(enumerator, &rel, &file, NULL))
{
plugin_t *plugin;
plugin_constructor_t constructor;
ending = file + strlen(file) - 3;
if (ending <= file || !streq(ending, ".so"))
{ /* only process .so libraries */
continue;
}
if (!strneq(prefix, rel, strlen(prefix)))
{
continue;
}
handle = dlopen(file, RTLD_LAZY);
if (handle == NULL)
{
DBG1("loading plugin %s failed: %s", rel, dlerror());
continue;
}
constructor = dlsym(handle, "plugin_create");
if (constructor == NULL)
{
DBG1("plugin %s has no plugin_create() function, skipped", rel);
dlclose(handle);
continue;
}
plugin = constructor();
if (plugin == NULL)
{
DBG1("plugin %s constructor failed, skipping", rel);
dlclose(handle);
continue;
}
DBG1("plugin %s loaded successfully", rel);
/* insert in front to destroy them in reverse order */
this->plugins->insert_last(this->plugins, plugin);
/* we do not store or free dlopen() handles, leak_detective requires
* the modules to keep loaded until leak report */
count++;
}
enumerator->destroy(enumerator);
return count;
}
/**
* Implementation of plugin_loader_t.destroy
*/
static void destroy(private_plugin_loader_t *this)
{
this->plugins->destroy_offset(this->plugins, offsetof(plugin_t, destroy));
free(this);
}
/*
* see header file
*/
plugin_loader_t *plugin_loader_create()
{
private_plugin_loader_t *this = malloc_thing(private_plugin_loader_t);
this->public.load = (int(*)(plugin_loader_t*, char *path, char *prefix))load;
this->public.destroy = (void(*)(plugin_loader_t*))destroy;
this->plugins = linked_list_create();
return &this->public;
}
|
