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/*-
* Copyright (c) 2013 Arthur Mesh <arthurmesh@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/selinfo.h>
#include <sys/systm.h>
#include <dev/random/random_adaptors.h>
#include <dev/random/randomdev.h>
static struct mtx pseudo_random_block_mtx;
/* Used to fake out unused random calls in random_adaptor */
void
random_null_func(void)
{
}
static int
pseudo_random_block_read(void *buf __unused, int c __unused)
{
mtx_lock(&pseudo_random_block_mtx);
printf("random(4) device is blocking.\n");
msleep(pseudo_random_block_read, &pseudo_random_block_mtx, 0,
"block", 0);
mtx_unlock(&pseudo_random_block_mtx);
return (0);
}
static void
pseudo_random_block_init(void)
{
mtx_init(&pseudo_random_block_mtx, "sleep mtx for random_block",
NULL, MTX_DEF);
}
static void
pseudo_random_block_deinit(void)
{
mtx_destroy(&pseudo_random_block_mtx);
}
struct random_adaptor pseudo_random_block = {
.ident = "pseudo-RNG that always blocks",
.init = pseudo_random_block_init,
.deinit = pseudo_random_block_deinit,
.read = pseudo_random_block_read,
.write = (random_write_func_t *)random_null_func,
.reseed = (random_reseed_func_t *)random_null_func,
.seeded = 1,
};
static int
pseudo_random_panic_read(void *buf, int c)
{
panic("Insert a witty panic msg in here.");
return (0);
}
struct random_adaptor pseudo_random_panic = {
.ident = "pseudo-RNG that always panics on first read(2)",
.init = (random_init_func_t *)random_null_func,
.deinit = (random_deinit_func_t *)random_null_func,
.read = pseudo_random_panic_read,
.write = (random_write_func_t *)random_null_func,
.reseed = (random_reseed_func_t *)random_null_func,
.seeded = 1,
};
static int
pseudo_random_modevent(module_t mod, int type, void *unused)
{
switch (type) {
case MOD_LOAD:
random_adaptor_register("block", &pseudo_random_block);
EVENTHANDLER_INVOKE(random_adaptor_attach,
&pseudo_random_block);
random_adaptor_register("panic", &pseudo_random_panic);
return (0);
}
return (EINVAL);
}
RANDOM_ADAPTOR_MODULE(pseudo, pseudo_random_modevent, 1);
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