mirror of
https://github.com/rsmarples/dhcpcd.git
synced 2024-11-30 21:44:52 +08:00
101 lines
2.9 KiB
C
101 lines
2.9 KiB
C
/*
|
|
* dhcpcd - DHCP client daemon
|
|
* Copyright (c) 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.
|
|
*/
|
|
|
|
#define THIRTY_YEARS_IN_SECONDS 946707779
|
|
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
|
|
#include "common.h"
|
|
#include "duid.h"
|
|
#include "net.h"
|
|
|
|
size_t
|
|
get_duid(unsigned char *duid, const struct interface *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;
|
|
char *line;
|
|
|
|
/* 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(DUID, "r"))) {
|
|
while ((line = get_line(f))) {
|
|
len = hwaddr_aton(NULL, line);
|
|
if (len && len <= DUID_LEN) {
|
|
hwaddr_aton(duid, line);
|
|
break;
|
|
}
|
|
len = 0;
|
|
}
|
|
fclose(f);
|
|
if (len)
|
|
return len;
|
|
} else {
|
|
if (errno != ENOENT)
|
|
return 0;
|
|
}
|
|
|
|
/* No file? OK, lets make one based on our interface */
|
|
if (!(f = fopen(DUID, "w")))
|
|
return 0;
|
|
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;
|
|
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(DUID);
|
|
}
|
|
return len;
|
|
}
|