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
|
/**
* @file backend_manager.c
*
* @brief Implementation of backend_manager_t.
*
*/
/*
* 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.
*/
#include "backend_manager.h"
#include <sys/types.h>
#include <dirent.h>
#include <sys/stat.h>
#include <dlfcn.h>
#include <daemon.h>
#include <utils/linked_list.h>
#include <config/backends/writeable_backend.h>
typedef struct private_backend_manager_t private_backend_manager_t;
/**
* Private data of an backend_manager_t object.
*/
struct private_backend_manager_t {
/**
* Public part of backend_manager_t object.
*/
backend_manager_t public;
/**
* list of registered backends
*/
linked_list_t *backends;
/**
* Additional list of writable backends.
*/
linked_list_t *writeable;
/**
* List of dlopen() handles we used to open backends
*/
linked_list_t *handles;
};
/**
* implements backend_manager_t.get_ike_cfg.
*/
static ike_cfg_t *get_ike_cfg(private_backend_manager_t *this,
host_t *my_host, host_t *other_host)
{
backend_t *backend;
ike_cfg_t *config = NULL;
iterator_t *iterator = this->backends->create_iterator(this->backends, TRUE);
while (config == NULL && iterator->iterate(iterator, (void**)&backend))
{
config = backend->get_ike_cfg(backend, my_host, other_host);
}
iterator->destroy(iterator);
return config;
}
/**
* implements backend_manager_t.get_peer_cfg.
*/
static peer_cfg_t *get_peer_cfg(private_backend_manager_t *this,
identification_t *my_id, identification_t *other_id,
ca_info_t *other_ca_info)
{
backend_t *backend;
peer_cfg_t *config = NULL;
iterator_t *iterator = this->backends->create_iterator(this->backends, TRUE);
while (config == NULL && iterator->iterate(iterator, (void**)&backend))
{
config = backend->get_peer_cfg(backend, my_id, other_id, other_ca_info);
}
iterator->destroy(iterator);
return config;
}
/**
* implements backend_manager_t.add_peer_cfg.
*/
static void add_peer_cfg(private_backend_manager_t *this, peer_cfg_t *config)
{
writeable_backend_t *backend;
if (this->writeable->get_first(this->writeable, (void**)&backend) == SUCCESS)
{
backend->add_cfg(backend, config);
}
}
/**
* implements backend_manager_t.create_iterator.
*/
static iterator_t* create_iterator(private_backend_manager_t *this)
{
writeable_backend_t *backend;
if (this->writeable->get_first(this->writeable, (void**)&backend) == SUCCESS)
{
return backend->create_iterator(backend);
}
/* give out an empty iterator if we have no writable backend*/
return this->writeable->create_iterator(this->writeable, TRUE);
}
/**
* load the configuration backend modules
*/
static void load_backends(private_backend_manager_t *this)
{
struct dirent* entry;
DIR* dir;
dir = opendir(IPSEC_BACKENDDIR);
if (dir == NULL)
{
DBG1(DBG_CFG, "error opening backend modules directory "IPSEC_BACKENDDIR);
return;
}
DBG1(DBG_CFG, "loading backend modules from '"IPSEC_BACKENDDIR"'");
while ((entry = readdir(dir)) != NULL)
{
char file[256];
backend_t *backend;
backend_constructor_t constructor;
void *handle;
char *ending;
snprintf(file, sizeof(file), IPSEC_BACKENDDIR"/%s", entry->d_name);
ending = entry->d_name + strlen(entry->d_name) - 3;
if (ending <= entry->d_name || !streq(ending, ".so"))
{
/* skip anything which does not look like a library */
DBG2(DBG_CFG, " skipping %s, doesn't look like a library",
entry->d_name);
continue;
}
/* try to load the library */
handle = dlopen(file, RTLD_LAZY);
if (handle == NULL)
{
DBG1(DBG_CFG, " opening backend module %s failed: %s",
entry->d_name, dlerror());
continue;
}
constructor = dlsym(handle, "backend_create");
if (constructor == NULL)
{
DBG1(DBG_CFG, " backend module %s has no backend_create() "
"function, skipped", entry->d_name);
dlclose(handle);
continue;
}
backend = constructor();
if (backend == NULL)
{
DBG1(DBG_CFG, " unable to create instance of backend "
"module %s, skipped", entry->d_name);
dlclose(handle);
continue;
}
DBG1(DBG_CFG, " loaded backend module successfully from %s", entry->d_name);
this->backends->insert_last(this->backends, backend);
if (backend->is_writeable(backend))
{
this->writeable->insert_last(this->writeable, backend);
}
this->handles->insert_last(this->handles, handle);
}
closedir(dir);
}
/**
* Implementation of backend_manager_t.destroy.
*/
static void destroy(private_backend_manager_t *this)
{
this->backends->destroy_offset(this->backends, offsetof(backend_t, destroy));
this->writeable->destroy(this->writeable);
this->handles->destroy_function(this->handles, (void*)dlclose);
free(this);
}
/*
* Described in header-file
*/
backend_manager_t *backend_manager_create()
{
private_backend_manager_t *this = malloc_thing(private_backend_manager_t);
this->public.get_ike_cfg = (ike_cfg_t* (*)(backend_manager_t*, host_t*, host_t*))get_ike_cfg;
this->public.get_peer_cfg = (peer_cfg_t* (*)(backend_manager_t*,identification_t*,identification_t*,ca_info_t*))get_peer_cfg;
this->public.add_peer_cfg = (void (*)(backend_manager_t*,peer_cfg_t*))add_peer_cfg;
this->public.create_iterator = (iterator_t* (*)(backend_manager_t*))create_iterator;
this->public.destroy = (void (*)(backend_manager_t*))destroy;
this->backends = linked_list_create();
this->writeable = linked_list_create();
this->handles = linked_list_create();
load_backends(this);
return &this->public;
}
|
