166 lines
3.3 KiB
C
166 lines
3.3 KiB
C
/*
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* Copyright (C) 2008 Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "random_plugin.h"
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <library.h>
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#include <utils/debug.h>
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#include "random_rng.h"
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#ifndef DEV_RANDOM
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# define DEV_RANDOM "/dev/random"
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#endif
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#ifndef DEV_URANDOM
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# define DEV_URANDOM "/dev/urandom"
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#endif
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typedef struct private_random_plugin_t private_random_plugin_t;
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/**
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* private data of random_plugin
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*/
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struct private_random_plugin_t {
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/**
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* public functions
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*/
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random_plugin_t public;
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};
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/** /dev/random file descriptor */
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static int dev_random = -1;
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/** /dev/urandom file descriptor */
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static int dev_urandom = -1;
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/** Is strong randomness equivalent to true randomness? */
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static bool strong_equals_true = FALSE;
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/**
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* See header.
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*/
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int random_plugin_get_dev_random()
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{
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return dev_random;
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}
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/**
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* See header.
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*/
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int random_plugin_get_dev_urandom()
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{
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return dev_urandom;
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}
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/**
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* See header.
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*/
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bool random_plugin_get_strong_equals_true()
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{
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return strong_equals_true;
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}
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/**
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* Open a random device file
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*/
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static bool open_dev(char *file, int *fd)
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{
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*fd = open(file, O_RDONLY);
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if (*fd == -1)
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{
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DBG1(DBG_LIB, "opening \"%s\" failed: %s", file, strerror(errno));
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return FALSE;
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}
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if (fcntl(*fd, F_SETFD, FD_CLOEXEC) == -1)
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{
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DBG1(DBG_LIB, "setting FD_CLOEXEC for \"%s\" failed: %s",
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file, strerror(errno));
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}
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return TRUE;
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}
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METHOD(plugin_t, get_name, char*,
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private_random_plugin_t *this)
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{
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return "random";
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}
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METHOD(plugin_t, get_features, int,
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private_random_plugin_t *this, plugin_feature_t *features[])
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{
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static plugin_feature_t f[] = {
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PLUGIN_REGISTER(RNG, random_rng_create),
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PLUGIN_PROVIDE(RNG, RNG_STRONG),
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PLUGIN_PROVIDE(RNG, RNG_TRUE),
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};
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*features = f;
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return countof(f);
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}
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METHOD(plugin_t, destroy, void,
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private_random_plugin_t *this)
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{
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if (dev_random != -1)
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{
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close(dev_random);
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}
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if (dev_urandom != -1)
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{
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close(dev_urandom);
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}
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free(this);
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}
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/*
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* see header file
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*/
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plugin_t *random_plugin_create()
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{
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private_random_plugin_t *this;
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char *urandom_file, *random_file;
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INIT(this,
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.public = {
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.plugin = {
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.get_name = _get_name,
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.get_features = _get_features,
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.destroy = _destroy,
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},
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},
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);
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strong_equals_true = lib->settings->get_bool(lib->settings,
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"%s.plugins.random.strong_equals_true", FALSE, lib->ns);
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urandom_file = lib->settings->get_str(lib->settings,
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"%s.plugins.random.urandom", DEV_URANDOM, lib->ns);
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random_file = lib->settings->get_str(lib->settings,
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"%s.plugins.random.random", DEV_RANDOM, lib->ns);
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if (!open_dev(urandom_file, &dev_urandom) ||
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!open_dev(random_file, &dev_random))
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{
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destroy(this);
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return NULL;
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}
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return &this->public.plugin;
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}
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