hostap/src/utils/ext_password.c

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/*
* External password backend
* Copyright (c) 2012, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#ifdef __linux__
#include <sys/mman.h>
#endif /* __linux__ */
#include "common.h"
#include "ext_password_i.h"
#ifdef CONFIG_EXT_PASSWORD_TEST
extern struct ext_password_backend ext_password_test;
#endif /* CONFIG_EXT_PASSWORD_TEST */
static const struct ext_password_backend *backends[] = {
#ifdef CONFIG_EXT_PASSWORD_TEST
&ext_password_test,
#endif /* CONFIG_EXT_PASSWORD_TEST */
NULL
};
struct ext_password_data {
const struct ext_password_backend *backend;
void *priv;
};
struct ext_password_data * ext_password_init(const char *backend,
const char *params)
{
struct ext_password_data *data;
int i;
data = os_zalloc(sizeof(*data));
if (data == NULL)
return NULL;
for (i = 0; backends[i]; i++) {
if (os_strcmp(backends[i]->name, backend) == 0) {
data->backend = backends[i];
break;
}
}
if (!data->backend) {
os_free(data);
return NULL;
}
data->priv = data->backend->init(params);
if (data->priv == NULL) {
os_free(data);
return NULL;
}
return data;
}
void ext_password_deinit(struct ext_password_data *data)
{
if (data && data->backend && data->priv)
data->backend->deinit(data->priv);
os_free(data);
}
struct wpabuf * ext_password_get(struct ext_password_data *data,
const char *name)
{
if (data == NULL)
return NULL;
return data->backend->get(data->priv, name);
}
struct wpabuf * ext_password_alloc(size_t len)
{
struct wpabuf *buf;
buf = wpabuf_alloc(len);
if (buf == NULL)
return NULL;
#ifdef __linux__
if (mlock(wpabuf_head(buf), wpabuf_len(buf)) < 0) {
wpa_printf(MSG_ERROR, "EXT PW: mlock failed: %s",
strerror(errno));
}
#endif /* __linux__ */
return buf;
}
void ext_password_free(struct wpabuf *pw)
{
if (pw == NULL)
return;
os_memset(wpabuf_mhead(pw), 0, wpabuf_len(pw));
#ifdef __linux__
if (munlock(wpabuf_head(pw), wpabuf_len(pw)) < 0) {
wpa_printf(MSG_ERROR, "EXT PW: munlock failed: %s",
strerror(errno));
}
#endif /* __linux__ */
wpabuf_free(pw);
}