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https://gitlab.com/libvirt/libvirt.git
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150 lines
3.5 KiB
C
150 lines
3.5 KiB
C
/*
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* Copyright (C) 2007 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Authors:
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* Mark McLoughlin <markmc@redhat.com>
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*/
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#include "config.h"
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#include "uuid.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <time.h>
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#include <unistd.h>
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#include "internal.h"
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#define qemudLog(level, msg...) fprintf(stderr, msg)
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static int
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virUUIDGenerateRandomBytes(unsigned char *buf,
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int buflen)
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{
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int fd;
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if ((fd = open("/dev/urandom", O_RDONLY)) < 0)
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return errno;
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while (buflen > 0) {
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int n;
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if ((n = read(fd, buf, buflen)) <= 0) {
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if (errno == EINTR)
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continue;
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close(fd);
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return n < 0 ? errno : ENODATA;
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}
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buf += n;
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buflen -= n;
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}
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close(fd);
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return 0;
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}
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static int
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virUUIDGeneratePseudoRandomBytes(unsigned char *buf,
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int buflen)
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{
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srand(time(NULL));
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while (buflen > 0) {
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*buf = (int) (255.0 * (rand() / (double) RAND_MAX));
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buflen--;
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}
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return 0;
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}
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int
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virUUIDGenerate(unsigned char *uuid)
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{
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int err;
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if ((err = virUUIDGenerateRandomBytes(uuid, VIR_UUID_RAW_LEN)))
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qemudLog(QEMUD_WARN,
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"Falling back to pseudorandom UUID, "
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"failed to generate random bytes: %s", strerror(err));
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return virUUIDGeneratePseudoRandomBytes(uuid, VIR_UUID_RAW_LEN);
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}
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int
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virUUIDParse(const char *uuid, unsigned char *rawuuid) {
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const char *cur;
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int i;
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/*
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* do a liberal scan allowing '-' and ' ' anywhere between character
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* pairs as long as there is 32 of them in the end.
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*/
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cur = uuid;
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for (i = 0;i < 16;) {
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rawuuid[i] = 0;
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if (*cur == 0)
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goto error;
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if ((*cur == '-') || (*cur == ' ')) {
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cur++;
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continue;
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}
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if ((*cur >= '0') && (*cur <= '9'))
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rawuuid[i] = *cur - '0';
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else if ((*cur >= 'a') && (*cur <= 'f'))
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rawuuid[i] = *cur - 'a' + 10;
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else if ((*cur >= 'A') && (*cur <= 'F'))
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rawuuid[i] = *cur - 'A' + 10;
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else
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goto error;
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rawuuid[i] *= 16;
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cur++;
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if (*cur == 0)
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goto error;
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if ((*cur >= '0') && (*cur <= '9'))
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rawuuid[i] += *cur - '0';
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else if ((*cur >= 'a') && (*cur <= 'f'))
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rawuuid[i] += *cur - 'a' + 10;
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else if ((*cur >= 'A') && (*cur <= 'F'))
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rawuuid[i] += *cur - 'A' + 10;
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else
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goto error;
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i++;
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cur++;
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}
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return 0;
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error:
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return -1;
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}
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/*
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* Local variables:
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* indent-tabs-mode: nil
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* c-indent-level: 4
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* c-basic-offset: 4
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* tab-width: 4
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* End:
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*/
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