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:
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