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Annotation of embedaddon/strongswan/src/libstrongswan/plugins/random/random_plugin.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (C) 2008 Martin Willi
        !             3:  * HSR Hochschule fuer Technik Rapperswil
        !             4:  *
        !             5:  * This program is free software; you can redistribute it and/or modify it
        !             6:  * under the terms of the GNU General Public License as published by the
        !             7:  * Free Software Foundation; either version 2 of the License, or (at your
        !             8:  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
        !             9:  *
        !            10:  * This program is distributed in the hope that it will be useful, but
        !            11:  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            12:  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
        !            13:  * for more details.
        !            14:  */
        !            15: 
        !            16: #include "random_plugin.h"
        !            17: 
        !            18: #include <unistd.h>
        !            19: #include <sys/types.h>
        !            20: #include <sys/stat.h>
        !            21: #include <fcntl.h>
        !            22: #include <errno.h>
        !            23: 
        !            24: #include <library.h>
        !            25: #include <utils/debug.h>
        !            26: #include "random_rng.h"
        !            27: 
        !            28: #ifndef DEV_RANDOM
        !            29: # define DEV_RANDOM "/dev/random"
        !            30: #endif
        !            31: 
        !            32: #ifndef DEV_URANDOM
        !            33: # define DEV_URANDOM "/dev/urandom"
        !            34: #endif
        !            35: 
        !            36: typedef struct private_random_plugin_t private_random_plugin_t;
        !            37: 
        !            38: /**
        !            39:  * private data of random_plugin
        !            40:  */
        !            41: struct private_random_plugin_t {
        !            42: 
        !            43:        /**
        !            44:         * public functions
        !            45:         */
        !            46:        random_plugin_t public;
        !            47: };
        !            48: 
        !            49: /** /dev/random file descriptor */
        !            50: static int dev_random = -1;
        !            51: /** /dev/urandom file descriptor */
        !            52: static int dev_urandom = -1;
        !            53: 
        !            54: /** Is strong randomness equivalent to true randomness? */
        !            55: static bool strong_equals_true = FALSE;
        !            56: 
        !            57: /**
        !            58:  * See header.
        !            59:  */
        !            60: int random_plugin_get_dev_random()
        !            61: {
        !            62:        return dev_random;
        !            63: }
        !            64: 
        !            65: /**
        !            66:  * See header.
        !            67:  */
        !            68: int random_plugin_get_dev_urandom()
        !            69: {
        !            70:        return dev_urandom;
        !            71: }
        !            72: 
        !            73: /**
        !            74:  * See header.
        !            75:  */
        !            76: bool random_plugin_get_strong_equals_true()
        !            77: {
        !            78:        return strong_equals_true;
        !            79: }
        !            80: 
        !            81: /**
        !            82:  * Open a random device file
        !            83:  */
        !            84: static bool open_dev(char *file, int *fd)
        !            85: {
        !            86:        *fd = open(file, O_RDONLY);
        !            87:        if (*fd == -1)
        !            88:        {
        !            89:                DBG1(DBG_LIB, "opening \"%s\" failed: %s", file, strerror(errno));
        !            90:                return FALSE;
        !            91:        }
        !            92:        if (fcntl(*fd, F_SETFD, FD_CLOEXEC) == -1)
        !            93:        {
        !            94:                DBG1(DBG_LIB, "setting FD_CLOEXEC for \"%s\" failed: %s",
        !            95:                         file, strerror(errno));
        !            96:        }
        !            97:        return TRUE;
        !            98: }
        !            99: 
        !           100: METHOD(plugin_t, get_name, char*,
        !           101:        private_random_plugin_t *this)
        !           102: {
        !           103:        return "random";
        !           104: }
        !           105: 
        !           106: METHOD(plugin_t, get_features, int,
        !           107:        private_random_plugin_t *this, plugin_feature_t *features[])
        !           108: {
        !           109:        static plugin_feature_t f[] = {
        !           110:                PLUGIN_REGISTER(RNG, random_rng_create),
        !           111:                        PLUGIN_PROVIDE(RNG, RNG_STRONG),
        !           112:                        PLUGIN_PROVIDE(RNG, RNG_TRUE),
        !           113:        };
        !           114:        *features = f;
        !           115:        return countof(f);
        !           116: }
        !           117: 
        !           118: METHOD(plugin_t, destroy, void,
        !           119:        private_random_plugin_t *this)
        !           120: {
        !           121:        if (dev_random != -1)
        !           122:        {
        !           123:                close(dev_random);
        !           124:        }
        !           125:        if (dev_urandom != -1)
        !           126:        {
        !           127:                close(dev_urandom);
        !           128:        }
        !           129:        free(this);
        !           130: }
        !           131: 
        !           132: /*
        !           133:  * see header file
        !           134:  */
        !           135: plugin_t *random_plugin_create()
        !           136: {
        !           137:        private_random_plugin_t *this;
        !           138:        char *urandom_file, *random_file;
        !           139: 
        !           140:        INIT(this,
        !           141:                .public = {
        !           142:                        .plugin = {
        !           143:                                .get_name = _get_name,
        !           144:                                .get_features = _get_features,
        !           145:                                .destroy = _destroy,
        !           146:                        },
        !           147:                },
        !           148:        );
        !           149: 
        !           150:        strong_equals_true = lib->settings->get_bool(lib->settings,
        !           151:                                                "%s.plugins.random.strong_equals_true", FALSE, lib->ns);
        !           152:        urandom_file = lib->settings->get_str(lib->settings,
        !           153:                                                "%s.plugins.random.urandom", DEV_URANDOM, lib->ns);
        !           154:        random_file = lib->settings->get_str(lib->settings,
        !           155:                                                "%s.plugins.random.random", DEV_RANDOM, lib->ns);
        !           156:        if (!open_dev(urandom_file, &dev_urandom) ||
        !           157:                !open_dev(random_file, &dev_random))
        !           158:        {
        !           159:                destroy(this);
        !           160:                return NULL;
        !           161:        }
        !           162: 
        !           163:        return &this->public.plugin;
        !           164: }
        !           165: