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/*
* dhcpcd - DHCP client daemon
* Copyright 2006-2008 Roy Marples <roy@marples.name>
* All rights reserved
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <arpa/inet.h>
#include <errno.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include "config.h"
#include "common.h"
#include "duid.h"
#include "logger.h"
#ifdef ENABLE_DUID
#define THIRTY_YEARS_IN_SECONDS 946707779
size_t get_duid (unsigned char *duid, const interface_t *iface)
{
FILE *f;
uint16_t type = 0;
uint16_t hw = 0;
uint32_t ul;
time_t t;
int x = 0;
unsigned char *p = duid;
size_t len = 0;
if (! iface)
return (0);
/* If we already have a DUID then use it as it's never supposed
* to change once we have one even if the interfaces do */
if ((f = fopen (DUIDFILE, "r")))
{
char *line = get_line (f);
if (line)
{
len = hwaddr_aton (NULL, line);
if (len && len <= DUID_LEN)
hwaddr_aton (duid, line);
free (line);
}
fclose (f);
if (len)
return (len);
}
else
{
if (errno != ENOENT)
{
logger (LOG_ERR, "fopen `%s': %s",
DUIDFILE, strerror (errno));
return (0);
}
}
/* No file? OK, lets make one based on our interface */
type = htons (1); /* DUI-D-LLT */
memcpy (p, &type, 2);
p += 2;
hw = htons (iface->family);
memcpy (p, &hw, 2);
p += 2;
/* time returns seconds from jan 1 1970, but DUID-LLT is
* seconds from jan 1 2000 modulo 2^32 */
t = time (NULL) - THIRTY_YEARS_IN_SECONDS;
ul = htonl (t & 0xffffffff);
memcpy (p, &ul, 4);
p += 4;
/* Finally, add the MAC address of the interface */
memcpy (p, iface->hwaddr, iface->hwlen);
p += iface->hwlen;
len = p - duid;
if (! (f = fopen (DUIDFILE, "w")))
logger (LOG_ERR, "fopen `%s': %s", DUIDFILE, strerror (errno));
else
{
x = fprintf (f, "%s\n", hwaddr_ntoa (duid, len));
fclose (f);
}
/* Failed to write the duid? scrub it, we cannot use it */
if (x < 1)
{
len = 0;
unlink (DUIDFILE);
}
return (len);
}
#endif
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