/* vim: set expandtab ts=4 sw=4: */
/*
* You may redistribute this program and/or modify it under the terms of
* the GNU General Public License as published by the Free Software Foundation,
* either version 3 of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
#define _GNU_SOURCE
#include "crypto/random/seed/LinuxRandomUuidSysctlRandomSeed.h"
#include "util/Identity.h"
#include "util/Bits.h"
#include "util/Hex.h"
#include
#include
#ifndef SYS_getrandom
#include
static int getUUID(uint64_t output[2])
{
int mib[] = { CTL_KERN, KERN_RANDOM, RANDOM_UUID };
size_t sixteen = 16;
Bits_memset(output, 0, 16);
if (sysctl(mib, 3, output, &sixteen, NULL, 0)
|| Bits_isZero(output, 16))
{
return -1;
}
return 0;
}
#endif
static int get(RandomSeed_t* randomSeed, uint64_t output[8])
{
#ifdef SYS_getrandom
// Try using getrandom instead sysctl as with systems with getrandom
// sysctl is probably alrady deprecated and possibly disabled.
Bits_memset(output, 0, 64); // Just make sure that it is zero all along.
long ret = syscall(SYS_getrandom, output, 64, 0);
if (ret == 64 && !Bits_isZero(output, 64)) {
return 0;
}
return -1;
#else
if (getUUID(output) || getUUID(output+2) || getUUID(output+4) || getUUID(output+6)) {
return -1;
}
return 0;
#endif
}
RandomSeed_t* LinuxRandomUuidSysctlRandomSeed_new(struct Allocator* alloc)
{
return Allocator_clone(alloc, (&(RandomSeed_t) {
.get = get,
.name = "sysctl(RANDOM_UUID) (Linux)"
}));
}