/* 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)" })); }