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/*
* Copyright (C) 2008 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 "random_plugin.h"
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <library.h>
#include <utils/debug.h>
#include "random_rng.h"
#ifndef DEV_RANDOM
# define DEV_RANDOM "/dev/random"
#endif
#ifndef DEV_URANDOM
# define DEV_URANDOM "/dev/urandom"
#endif
typedef struct private_random_plugin_t private_random_plugin_t;
/**
* private data of random_plugin
*/
struct private_random_plugin_t {
/**
* public functions
*/
random_plugin_t public;
};
/** /dev/random file descriptor */
static int dev_random = -1;
/** /dev/urandom file descriptor */
static int dev_urandom = -1;
/** Is strong randomness equivalent to true randomness? */
static bool strong_equals_true = FALSE;
/**
* See header.
*/
int random_plugin_get_dev_random()
{
return dev_random;
}
/**
* See header.
*/
int random_plugin_get_dev_urandom()
{
return dev_urandom;
}
/**
* See header.
*/
bool random_plugin_get_strong_equals_true()
{
return strong_equals_true;
}
/**
* Open a random device file
*/
static bool open_dev(char *file, int *fd)
{
*fd = open(file, O_RDONLY);
if (*fd == -1)
{
DBG1(DBG_LIB, "opening \"%s\" failed: %s", file, strerror(errno));
return FALSE;
}
return TRUE;
}
METHOD(plugin_t, get_name, char*,
private_random_plugin_t *this)
{
return "random";
}
METHOD(plugin_t, get_features, int,
private_random_plugin_t *this, plugin_feature_t *features[])
{
static plugin_feature_t f[] = {
PLUGIN_REGISTER(RNG, random_rng_create),
PLUGIN_PROVIDE(RNG, RNG_STRONG),
PLUGIN_PROVIDE(RNG, RNG_TRUE),
};
*features = f;
return countof(f);
}
METHOD(plugin_t, destroy, void,
private_random_plugin_t *this)
{
if (dev_random != -1)
{
close(dev_random);
}
if (dev_urandom != -1)
{
close(dev_urandom);
}
free(this);
}
/*
* see header file
*/
plugin_t *random_plugin_create()
{
private_random_plugin_t *this;
char *urandom_file, *random_file;
INIT(this,
.public = {
.plugin = {
.get_name = _get_name,
.get_features = _get_features,
.destroy = _destroy,
},
},
);
strong_equals_true = lib->settings->get_bool(lib->settings,
"%s.plugins.random.strong_equals_true", FALSE, lib->ns);
urandom_file = lib->settings->get_str(lib->settings,
"%s.plugins.random.urandom", DEV_URANDOM, lib->ns);
random_file = lib->settings->get_str(lib->settings,
"%s.plugins.random.random", DEV_RANDOM, lib->ns);
if (!open_dev(urandom_file, &dev_urandom) ||
!open_dev(random_file, &dev_random))
{
destroy(this);
return NULL;
}
return &this->public.plugin;
}
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