mirror of
https://github.com/troglobit/finit.git
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Joachim Nilsson
88a4ebf9e7
Libraries and system headers should be included with <> instead of "". This makes a great difference for the automatic dependency tracking. Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
/* Setup random seed
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*
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* Copyright (c) 2012 Joachim Nilsson <troglobit@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/time.h> /* gettimeofday() */
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#include <sys/types.h>
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#include <lite/lite.h>
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#include "../config.h"
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#include "../finit.h"
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#include "../helpers.h"
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#include "../plugin.h"
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static void setup(void *UNUSED(arg))
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{
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#ifdef RANDOMSEED
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if (!fexist(RANDOMSEED)) {
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int ret = 1;
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FILE *fp;
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print_desc("Bootstrapping random seed", NULL);
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umask(077);
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fp = fopen(RANDOMSEED, "w");
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if (fp) {
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int iter = 128;
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struct timeval tv;
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gettimeofday(&tv, NULL);
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srandom(tv.tv_sec % 3600);
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while (iter--) {
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uint32_t i, prng = random();
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for (i = 0; i < sizeof(prng); i++)
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fputc((prng >> (i * CHAR_BIT)) & UCHAR_MAX, fp);
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}
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ret = fclose(fp);
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}
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print_result(ret);
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umask(0);
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}
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print_desc("Initializing random number generator", NULL);
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print_result(512 != copyfile(RANDOMSEED, "/dev/urandom", 0, 0));
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#endif
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}
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static void save(void *UNUSED(arg))
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{
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#ifdef RANDOMSEED
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umask(077);
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print_desc("Saving random seed", NULL);
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print_result(512 != copyfile("/dev/urandom", RANDOMSEED, 512, 0));
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umask(0);
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#endif
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}
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static plugin_t plugin = {
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.name = __FILE__,
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.hook[HOOK_BASEFS_UP] = { .cb = setup },
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.hook[HOOK_SHUTDOWN] = { .cb = save },
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.depends = { "bootmisc", }
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};
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PLUGIN_INIT(plugin_init)
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{
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plugin_register(&plugin);
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}
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PLUGIN_EXIT(plugin_exit)
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{
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plugin_unregister(&plugin);
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}
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/**
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* Local Variables:
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* indent-tabs-mode: t
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* c-file-style: "linux"
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* End:
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*/
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