mirror of
https://gitlab.com/libvirt/libvirt.git
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200 lines
4.9 KiB
C
200 lines
4.9 KiB
C
/*
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* Copyright (C) 2007, 2008, 2009 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 <stdio.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 "c-ctype.h"
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#include "internal.h"
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#include "util.h"
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#include "virterror_internal.h"
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#include "logging.h"
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#ifndef ENODATA
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#define ENODATA EIO
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#endif
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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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while (buflen > 0) {
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*buf = virRandom(256);
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buflen--;
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}
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return 0;
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}
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/**
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* virUUIDGenerate:
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* @uuid: array of VIR_UUID_BUFLEN bytes to store the new UUID
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*
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* Generates a randomized unique identifier.
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*
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* Returns 0 in case of success and -1 in case of failure
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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 (uuid == NULL)
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return(-1);
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if ((err = virUUIDGenerateRandomBytes(uuid, VIR_UUID_BUFLEN))) {
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char ebuf[1024];
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VIR_WARN(_("Falling back to pseudorandom UUID,"
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" failed to generate random bytes: %s"),
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virStrerror(err, ebuf, sizeof ebuf));
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}
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return virUUIDGeneratePseudoRandomBytes(uuid, VIR_UUID_BUFLEN);
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}
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/* Convert C from hexadecimal character to integer. */
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static int
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hextobin (unsigned char c)
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{
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switch (c)
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{
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default: return c - '0';
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case 'a': case 'A': return 10;
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case 'b': case 'B': return 11;
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case 'c': case 'C': return 12;
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case 'd': case 'D': return 13;
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case 'e': case 'E': return 14;
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case 'f': case 'F': return 15;
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}
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}
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/**
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* virUUIDParse:
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* @uuidstr: zero terminated string representation of the UUID
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* @uuid: array of VIR_UUID_BUFLEN bytes to store the raw UUID
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*
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* Parses the external string representation, allowing spaces and '-'
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* character in the sequence, and storing the result as a raw UUID
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*
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* Returns 0 in case of success and -1 in case of error.
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*/
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int
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virUUIDParse(const char *uuidstr, unsigned char *uuid) {
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const char *cur;
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int i;
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if ((uuidstr == NULL) || (uuid == NULL))
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return(-1);
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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 = uuidstr;
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for (i = 0;i < VIR_UUID_BUFLEN;) {
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uuid[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 (!c_isxdigit(*cur))
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goto error;
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uuid[i] = hextobin(*cur);
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uuid[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 (!c_isxdigit(*cur))
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goto error;
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uuid[i] += hextobin(*cur);
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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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* virUUIDFormat:
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* @uuid: array of VIR_UUID_RAW_LEN bytes to store the raw UUID
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* @uuidstr: array of VIR_UUID_STRING_BUFLEN bytes to store the
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* string representation of the UUID in. The resulting string
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* will be NULL terminated.
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*
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* Converts the raw UUID into printable format, with embedded '-'
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*
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* Returns 0 in case of success and -1 in case of error.
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*/
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void virUUIDFormat(const unsigned char *uuid, char *uuidstr)
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{
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snprintf(uuidstr, VIR_UUID_STRING_BUFLEN,
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"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
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uuid[0], uuid[1], uuid[2], uuid[3],
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uuid[4], uuid[5], uuid[6], uuid[7],
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uuid[8], uuid[9], uuid[10], uuid[11],
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uuid[12], uuid[13], uuid[14], uuid[15]);
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uuidstr[VIR_UUID_STRING_BUFLEN-1] = '\0';
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}
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