diff options
Diffstat (limited to 'src/polypcore/random.c')
-rw-r--r-- | src/polypcore/random.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/src/polypcore/random.c b/src/polypcore/random.c new file mode 100644 index 00000000..12f27bfd --- /dev/null +++ b/src/polypcore/random.c @@ -0,0 +1,71 @@ +/* $Id$ */ + +/*** + This file is part of polypaudio. + + polypaudio is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + polypaudio 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with polypaudio; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + USA. +***/ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <fcntl.h> +#include <unistd.h> +#include <errno.h> +#include <string.h> +#include <stdlib.h> +#include <assert.h> +#include <time.h> + +#include "random.h" +#include "util.h" +#include "log.h" + +#ifndef OS_IS_WIN32 +#define RANDOM_DEVICE "/dev/urandom" +#endif + +void pa_random(void *ret_data, size_t length) { + int fd; + ssize_t r = 0; + assert(ret_data && length); + +#ifdef RANDOM_DEVICE + if ((fd = open(RANDOM_DEVICE, O_RDONLY)) >= 0) { + + if ((r = pa_loop_read(fd, ret_data, length)) < 0 || (size_t) r != length) + pa_log_error(__FILE__": failed to read entropy from '%s'\n", RANDOM_DEVICE); + + close(fd); + } +#endif + + if ((size_t) r != length) { + uint8_t *p; + size_t l; + +#ifdef RANDOM_DEVICE + pa_log_warn(__FILE__": WARNING: Failed to open entropy device '"RANDOM_DEVICE"': %s" + ", falling back to unsecure pseudo RNG.\n", strerror(errno)); +#endif + + srand(time(NULL)); + + for (p = ret_data, l = length; l > 0; p++, l--) + *p = (uint8_t) rand(); + } +} |