mirror of
https://github.com/cjdelisle/cjdns
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62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
/* vim: set expandtab ts=4 sw=4: */
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/*
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* You may redistribute this program and/or modify it under the terms of
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* the GNU General Public License as published by the Free Software Foundation,
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* either version 3 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "crypto/random/seed/BsdKernArndSysctlRandomSeed.h"
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#include "util/Identity.h"
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#include "util/Bits.h"
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#include <unistd.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/sysctl.h>
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/** Number of times to try each operation. */
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#define MAX_TRIES 10
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static int get(struct RandomSeed* randomSeed, uint64_t output[8])
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{
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int mib[] = { CTL_KERN, KERN_ARND };
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Bits_memset(output, 0, 64);
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size_t len = 64;
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if (sysctl(mib, 2, output, &len, NULL, 0) == -1) {
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// TOR/Libevent retry this 4 bytes at a time if it fails initially.
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size_t four = 4;
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int tries = 0;
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union {
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uint64_t longs[8];
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uint32_t ints[16];
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} num;
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for (int i = 0; i < 16; i++) {
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if (sysctl(mib, 2, &num.ints[i], &four, NULL, 0) == -1) {
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return -1;
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}
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if (num.ints[i] == 0) {
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i--;
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if (++tries > MAX_TRIES) {
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return -1;
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}
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}
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}
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}
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return Bits_isZero(output, 64) ? -1 : 0;
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}
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struct RandomSeed* BsdKernArndSysctlRandomSeed_new(struct Allocator* alloc)
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{
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return Allocator_clone(alloc, (&(struct RandomSeed) {
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.get = get,
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.name = "sysctl(KERN_ARND) (BSD)"
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}));
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}
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