mirror of
https://github.com/open5gs/open5gs.git
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132 lines
3.2 KiB
C
132 lines
3.2 KiB
C
/*
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* Copyright (C) 2019 by Sukchan Lee <acetcom@gmail.com>
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*
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* This file is part of Open5GS.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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 "core-config-private.h"
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#if HAVE_SYS_PARAM_H
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#include <sys/param.h>
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#endif
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#if HAVE_SYS_RANDOM_H
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#include <sys/random.h>
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#endif
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#if HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include "ogs-core.h"
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void ogs_random(void *buf, size_t buflen)
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{
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#ifdef _WIN32
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void arc4random_buf(void *buf, size_t n);
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arc4random_buf(buf, buflen);
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#elif defined(HAVE_GETRANDOM)
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int rc = getrandom(buf, buflen, GRND_NONBLOCK);
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if (rc < 0) {
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ogs_log_message(OGS_LOG_FATAL, ogs_errno, "getrandom() failed");
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ogs_assert_if_reached();
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}
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#elif defined(HAVE_ARC4RANDOM_BUF)
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arc4random_buf(buf, buflen);
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#elif defined(OGS_DEV_RANDOM)
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int fd = -1;
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/* On BSD/OS 4.1, /dev/random gives out 8 bytes at a time, then
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* gives EOF, so reading 'buflen' bytes may require opening the
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* device several times. */
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do {
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int rc;
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if (fd == -1)
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if ((fd = open(OGS_DEV_RANDOM, O_RDONLY)) == -1) {
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ogs_log_message(OGS_LOG_FATAL, ogs_errno, "open() failed");
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ogs_assert_if_reached();
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}
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do {
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rc = read(fd, buf, buflen);
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} while (rc == -1 && errno == EINTR);
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if (rc < 0) {
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ogs_log_message(OGS_LOG_ERROR, ogs_errno, "read() failed");
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close(fd);
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return;
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}
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else if (rc == 0) {
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close(fd);
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fd = -1; /* force open() again */
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}
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else {
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buf = (unsigned char *)buf + rc;
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buflen -= rc;
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}
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} while (buflen > 0);
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close(fd);
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#else
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#error cannot find a method which finds a pseudo-random number
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#endif
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}
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uint32_t ogs_random32(void)
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{
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#ifdef _WIN32
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uint32_t arc4random(void);
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return arc4random();
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#elif defined(HAVE_ARC4RANDOM_BUF)
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return arc4random();
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#else
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uint32_t rand32;
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ogs_random(&rand32, sizeof(rand32));
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return rand32;
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#endif
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}
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#ifdef _WIN32
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#define ARC4RANDOM_NO_INCLUDES
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#define ARC4_LOCK_() do {} while(0)
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#define ARC4_UNLOCK_() do {} while(0)
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#define ARC4RANDOM_UINT32 uint32_t
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#define ARC4RANDOM_NOSTIR
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#define ARC4RANDOM_NOADDRANDOM
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#define ARC4RANDOM_NOUNIFORM
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/**
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* Stolen from libevent library.
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* https://github.com/libevent/libevent/blob/master/evutil.c
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*/
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void *(*volatile evutil_memset_volatile_)(void *, int, size_t) = memset;
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static void evutil_memclear_(void *mem, size_t len)
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{
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evutil_memset_volatile_(mem, 0, len);
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}
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#include "arc4random.c"
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#endif
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