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117 lines
2.7 KiB
C
117 lines
2.7 KiB
C
/***
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This file is part of PulseAudio.
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Copyright 2004-2006 Lennart Poettering
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Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
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PulseAudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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PulseAudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with PulseAudio; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <time.h>
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#include <pulsecore/core-util.h>
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#include <pulsecore/log.h>
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#include <pulsecore/macro.h>
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#include "random.h"
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static pa_bool_t has_whined = TRUE;
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static const char * const devices[] = { "/dev/urandom", "/dev/random", NULL };
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static int random_proper(void *ret_data, size_t length) {
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#ifdef OS_IS_WIN32
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pa_assert(ret_data);
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pa_assert(length > 0);
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return -1;
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#else /* OS_IS_WIN32 */
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int fd, ret = -1;
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ssize_t r = 0;
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const char *const * device;
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pa_assert(ret_data);
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pa_assert(length > 0);
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device = devices;
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while (*device) {
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ret = 0;
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if ((fd = pa_open_cloexec(*device, O_RDONLY, 0)) >= 0) {
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if ((r = pa_loop_read(fd, ret_data, length, NULL)) < 0 || (size_t) r != length)
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ret = -1;
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pa_close(fd);
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} else
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ret = -1;
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if (ret == 0)
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break;
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device++;
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}
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return ret;
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#endif /* OS_IS_WIN32 */
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}
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void pa_random_seed(void) {
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unsigned int seed;
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if (random_proper(&seed, sizeof(unsigned int)) < 0) {
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if (!has_whined) {
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pa_log_warn("Failed to get proper entropy. Falling back to seeding with current time.");
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has_whined = TRUE;
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}
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seed = (unsigned int) time(NULL);
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}
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srand(seed);
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}
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void pa_random(void *ret_data, size_t length) {
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uint8_t *p;
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size_t l;
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pa_assert(ret_data);
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pa_assert(length > 0);
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if (random_proper(ret_data, length) >= 0)
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return;
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if (!has_whined) {
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pa_log_warn("Failed to get proper entropy. Falling back to unsecure pseudo RNG.");
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has_whined = TRUE;
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}
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for (p = ret_data, l = length; l > 0; p++, l--)
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*p = (uint8_t) rand();
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}
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