diff options
author | Lennart Poettering <lennart@poettering.net> | 2006-06-19 21:53:48 +0000 |
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committer | Lennart Poettering <lennart@poettering.net> | 2006-06-19 21:53:48 +0000 |
commit | f44ba092651aa75055e109e04b4164ea92ae7fdc (patch) | |
tree | 5dfe076191b32946e78edf64d584d0a65f320013 /src/pulsecore/random.c | |
parent | dd21f11deda64e65a6f75817496534c2c9dda1a8 (diff) |
big s/polyp/pulse/g
git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@1033 fefdeb5f-60dc-0310-8127-8f9354f1896f
Diffstat (limited to 'src/pulsecore/random.c')
-rw-r--r-- | src/pulsecore/random.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/src/pulsecore/random.c b/src/pulsecore/random.c new file mode 100644 index 00000000..3d3357a5 --- /dev/null +++ b/src/pulsecore/random.c @@ -0,0 +1,108 @@ +/* $Id$ */ + +/*** + This file is part of PulseAudio. + + PulseAudio 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. + + PulseAudio 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 PulseAudio; 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 <pulsecore/core-util.h> +#include <pulsecore/log.h> + +#include "random.h" + +static int has_whined = 0; + +static const char *devices[] = { "/dev/urandom", "/dev/random", NULL }; + +static int random_proper(void *ret_data, size_t length) { +#ifdef OS_IS_WIN32 + assert(ret_data && length); + + return -1; + +#else /* OS_IS_WIN32 */ + + int fd, ret = -1; + ssize_t r = 0; + const char **device; + + assert(ret_data && length); + + device = devices; + + while (*device) { + ret = 0; + + if ((fd = open(*device, O_RDONLY)) >= 0) { + + if ((r = pa_loop_read(fd, ret_data, length)) < 0 || (size_t) r != length) + ret = -1; + + close(fd); + } else + ret = -1; + + if (ret == 0) + break; + } + + return ret; +#endif /* OS_IS_WIN32 */ +} + +void pa_random_seed(void) { + unsigned int seed; + + if (random_proper(&seed, sizeof(unsigned int)) < 0) { + if (!has_whined) + pa_log_warn(__FILE__": failed to get proper entropy. Falling back to seeding with current time."); + has_whined = 1; + + seed = (unsigned int) time(NULL); + } + + srand(seed); +} + +void pa_random(void *ret_data, size_t length) { + uint8_t *p; + size_t l; + + assert(ret_data && length); + + if (random_proper(ret_data, length) >= 0) + return; + + if (!has_whined) + pa_log_warn(__FILE__": failed to get proper entropy. Falling back to unsecure pseudo RNG."); + has_whined = 1; + + for (p = ret_data, l = length; l > 0; p++, l--) + *p = (uint8_t) rand(); +} |