libvirt/src/uuid.c
Jim Meyering dc42a9d2de remove Vim and Emacs variable settings from C source files
Done with these commands:
git grep -l Local.variab|xargs \
  perl -0x3b -pi -e 's,\n+/\*\n \* vim:(.|\n)*,\n,'

git grep -l Local.variab|xargs \
  perl -0x3b -pi -e 's,\n+/\*\n \* Local variables:\n(.|\n)*,\n,'
2008-04-10 16:53:29 +00:00

190 lines
4.8 KiB
C

/*
* Copyright (C) 2007, 2008 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Authors:
* Mark McLoughlin <markmc@redhat.com>
*/
#include <config.h>
#include "uuid.h"
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>
#include "internal.h"
#define qemudLog(level, msg...) fprintf(stderr, msg)
#ifndef ENODATA
#define ENODATA EIO
#endif
static int
virUUIDGenerateRandomBytes(unsigned char *buf,
int buflen)
{
int fd;
if ((fd = open("/dev/urandom", O_RDONLY)) < 0)
return errno;
while (buflen > 0) {
int n;
if ((n = read(fd, buf, buflen)) <= 0) {
if (errno == EINTR)
continue;
close(fd);
return n < 0 ? errno : ENODATA;
}
buf += n;
buflen -= n;
}
close(fd);
return 0;
}
static int
virUUIDGeneratePseudoRandomBytes(unsigned char *buf,
int buflen)
{
srand(time(NULL));
while (buflen > 0) {
*buf = (int) (255.0 * (rand() / (double) RAND_MAX));
buflen--;
}
return 0;
}
/**
* virUUIDGenerate:
* @uuid: array of VIR_UUID_BUFLEN bytes to store the new UUID
*
* Generates a randomized unique identifier.
*
* Returns 0 in case of success and -1 in case of failure
*/
int
virUUIDGenerate(unsigned char *uuid)
{
int err;
if (uuid == NULL)
return(-1);
if ((err = virUUIDGenerateRandomBytes(uuid, VIR_UUID_BUFLEN)))
qemudLog(QEMUD_WARN,
_("Falling back to pseudorandom UUID,"
" failed to generate random bytes: %s"), strerror(err));
return virUUIDGeneratePseudoRandomBytes(uuid, VIR_UUID_BUFLEN);
}
/**
* virUUIDParse:
* @uuidstr: zero terminated string representation of the UUID
* @uuid: array of VIR_UUID_BUFLEN bytes to store the raw UUID
*
* Parses the external string representation, allowing spaces and '-'
* character in the sequence, and storing the result as a raw UUID
*
* Returns 0 in case of success and -1 in case of error.
*/
int
virUUIDParse(const char *uuidstr, unsigned char *uuid) {
const char *cur;
int i;
if ((uuidstr == NULL) || (uuid == NULL))
return(-1);
/*
* do a liberal scan allowing '-' and ' ' anywhere between character
* pairs as long as there is 32 of them in the end.
*/
cur = uuidstr;
for (i = 0;i < VIR_UUID_BUFLEN;) {
uuid[i] = 0;
if (*cur == 0)
goto error;
if ((*cur == '-') || (*cur == ' ')) {
cur++;
continue;
}
if ((*cur >= '0') && (*cur <= '9'))
uuid[i] = *cur - '0';
else if ((*cur >= 'a') && (*cur <= 'f'))
uuid[i] = *cur - 'a' + 10;
else if ((*cur >= 'A') && (*cur <= 'F'))
uuid[i] = *cur - 'A' + 10;
else
goto error;
uuid[i] *= 16;
cur++;
if (*cur == 0)
goto error;
if ((*cur >= '0') && (*cur <= '9'))
uuid[i] += *cur - '0';
else if ((*cur >= 'a') && (*cur <= 'f'))
uuid[i] += *cur - 'a' + 10;
else if ((*cur >= 'A') && (*cur <= 'F'))
uuid[i] += *cur - 'A' + 10;
else
goto error;
i++;
cur++;
}
return 0;
error:
return -1;
}
/**
* virUUIDFormat:
* @uuid: array of VIR_UUID_RAW_LEN bytes to store the raw UUID
* @uuidstr: array of VIR_UUID_STRING_BUFLEN bytes to store the
* string representation of the UUID in. The resulting string
* will be NULL terminated.
*
* Converts the raw UUID into printable format, with embedded '-'
*
* Returns 0 in case of success and -1 in case of error.
*/
void virUUIDFormat(const unsigned char *uuid, char *uuidstr)
{
snprintf(uuidstr, VIR_UUID_STRING_BUFLEN,
"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
uuid[0], uuid[1], uuid[2], uuid[3],
uuid[4], uuid[5], uuid[6], uuid[7],
uuid[8], uuid[9], uuid[10], uuid[11],
uuid[12], uuid[13], uuid[14], uuid[15]);
uuidstr[VIR_UUID_STRING_BUFLEN-1] = '\0';
}