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/*
* Copyright (C) 2008-2012, Parallels, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <malloc.h>
#include <sys/stat.h>
#include <assert.h>
#include "ploop.h"
/* UUID generator. We use DCE style random UUIDs, it is easy. */
#define UUID_NLEN 16
#define UUID_FMT "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x"
struct helper_uuid_t {
__u32 time_low;
__u16 time_mid;
__u16 time_hi_and_version;
__u16 clock_seq;
__u8 node[6];
};
static int uuid_new(unsigned char * uuid)
{
int res;
int fd;
fd = open("/dev/urandom", O_RDONLY);
if (fd < 0)
return SYSEXIT_OPEN;
res = read(fd, uuid, UUID_NLEN);
close(fd);
if (res < 0)
return SYSEXIT_READ;
if (res != UUID_NLEN) {
errno = EINVAL;
return SYSEXIT_READ;
}
/* Version: random */
uuid[6] = (uuid[6] & 0x0F) | 0x40;
/* Variant: DCE. The highest bit is 1, the next is 0.
* Note, three bits allcoated but value of the third
* is arbitrary.
*/
uuid[8] = (uuid[8] & 0x3F) | 0x80;
return 0;
}
static void uuid_unpack(unsigned char *in, struct helper_uuid_t *uu)
{
unsigned char *ptr = in;
__u32 tmp;
tmp = *ptr++;
tmp = (tmp << 8) | *ptr++;
tmp = (tmp << 8) | *ptr++;
tmp = (tmp << 8) | *ptr++;
uu->time_low = tmp;
tmp = *ptr++;
tmp = (tmp << 8) | *ptr++;
uu->time_mid = tmp;
tmp = *ptr++;
tmp = (tmp << 8) | *ptr++;
uu->time_hi_and_version = tmp;
tmp = *ptr++;
tmp = (tmp << 8) | *ptr++;
uu->clock_seq = tmp;
memcpy(uu->node, ptr, 6);
}
static const char *uuid2str(unsigned char *in, char *out, int len)
{
struct helper_uuid_t uuid;
uuid_unpack(in, &uuid);
snprintf(out, len, UUID_FMT,
uuid.time_low, uuid.time_mid, uuid.time_hi_and_version,
uuid.clock_seq >> 8, uuid.clock_seq & 0xFF,
uuid.node[0], uuid.node[1], uuid.node[2],
uuid.node[3], uuid.node[4], uuid.node[5]);
return out;
}
static const char *prl_uuid2str(unsigned char *in, char *out, int len)
{
assert(!(len < 39));
out[0] = '{';
uuid2str(in, out + 1, len - 2);
out[37] = '}';
out[38] = '\0';
return out;
}
int ploop_uuid_generate(char *uuid, int len)
{
int ret;
unsigned char uu[16];
ret = uuid_new(uu);
if (ret) {
ploop_err(errno, "Can't generate uuid");
return ret;
}
prl_uuid2str(uu, uuid, len);
return 0;
}
int gen_uuid_pair(char *uuid1, int len1, char *uuid2, int len2)
{
int ret;
ret = ploop_uuid_generate(uuid1, len1);
if (ret)
return ret;
ret = ploop_uuid_generate(uuid2, len2);
if (ret)
return ret;
return 0;
}
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