1/*
2 * External password backend
3 * Copyright (c) 2012, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9#include "includes.h"
10
11#ifdef __linux__
12#include <sys/mman.h>
13#endif /* __linux__ */
14
15#include "common.h"
16#include "ext_password_i.h"
17
18
19static const struct ext_password_backend *backends[] = {
20#ifdef CONFIG_EXT_PASSWORD_TEST
21	&ext_password_test,
22#endif /* CONFIG_EXT_PASSWORD_TEST */
23	NULL
24};
25
26struct ext_password_data {
27	const struct ext_password_backend *backend;
28	void *priv;
29};
30
31
32struct ext_password_data * ext_password_init(const char *backend,
33					     const char *params)
34{
35	struct ext_password_data *data;
36	int i;
37
38	data = os_zalloc(sizeof(*data));
39	if (data == NULL)
40		return NULL;
41
42	for (i = 0; backends[i]; i++) {
43		if (os_strcmp(backends[i]->name, backend) == 0) {
44			data->backend = backends[i];
45			break;
46		}
47	}
48
49	if (!data->backend) {
50		os_free(data);
51		return NULL;
52	}
53
54	data->priv = data->backend->init(params);
55	if (data->priv == NULL) {
56		os_free(data);
57		return NULL;
58	}
59
60	return data;
61}
62
63
64void ext_password_deinit(struct ext_password_data *data)
65{
66	if (data && data->backend && data->priv)
67		data->backend->deinit(data->priv);
68	os_free(data);
69}
70
71
72struct wpabuf * ext_password_get(struct ext_password_data *data,
73				 const char *name)
74{
75	if (data == NULL)
76		return NULL;
77	return data->backend->get(data->priv, name);
78}
79
80
81struct wpabuf * ext_password_alloc(size_t len)
82{
83	struct wpabuf *buf;
84
85	buf = wpabuf_alloc(len);
86	if (buf == NULL)
87		return NULL;
88
89#ifdef __linux__
90	if (mlock(wpabuf_head(buf), wpabuf_len(buf)) < 0) {
91		wpa_printf(MSG_ERROR, "EXT PW: mlock failed: %s",
92			   strerror(errno));
93	}
94#endif /* __linux__ */
95
96	return buf;
97}
98
99
100void ext_password_free(struct wpabuf *pw)
101{
102	if (pw == NULL)
103		return;
104	os_memset(wpabuf_mhead(pw), 0, wpabuf_len(pw));
105#ifdef __linux__
106	if (munlock(wpabuf_head(pw), wpabuf_len(pw)) < 0) {
107		wpa_printf(MSG_ERROR, "EXT PW: munlock failed: %s",
108			   strerror(errno));
109	}
110#endif /* __linux__ */
111	wpabuf_free(pw);
112}
113