tor-android/external/badvpn_dns/random/BRandom2.c

91 lines
2.5 KiB
C

/**
* @file BRandom2.c
* @author Ambroz Bizjak <ambrop7@gmail.com>
*
* @section LICENSE
*
* 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.
* 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.
* 3. Neither the name of the author nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "BRandom2.h"
static int do_init (BRandom2 *o)
{
if (o->initialized) {
return 1;
}
o->urandom_fd = open("/dev/urandom", O_RDONLY);
if (o->urandom_fd < 0) {
return 0;
}
o->initialized = 1;
return 1;
}
int BRandom2_Init (BRandom2 *o, int flags)
{
ASSERT((flags & ~(BRANDOM2_INIT_LAZY)) == 0)
o->initialized = 0;
if (!(flags & BRANDOM2_INIT_LAZY) && !do_init(o)) {
return 0;
}
DebugObject_Init(&o->d_obj);
return 1;
}
void BRandom2_Free (BRandom2 *o)
{
DebugObject_Free(&o->d_obj);
if (o->initialized) {
close(o->urandom_fd);
}
}
int BRandom2_GenBytes (BRandom2 *o, void *out, size_t len)
{
DebugObject_Access(&o->d_obj);
if (!do_init(o)) {
return 0;
}
ssize_t res = read(o->urandom_fd, out, len);
if (res < 0 || res != len) {
return 0;
}
return 1;
}