mirror of
https://github.com/rsmarples/dhcpcd.git
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121 lines
2.9 KiB
C
121 lines
2.9 KiB
C
/*
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* dhcpcd - DHCP client daemon -
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* Copyright 2006-2007 Roy Marples <uberlord@gentoo.org>
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*
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* dhcpcd is an RFC2131 compliant DHCP client daemon.
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*
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <errno.h>
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#include <stdbool.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 <unistd.h>
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#include "config.h"
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#include "common.h"
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#include "duid.h"
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#include "logger.h"
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#ifdef ENABLE_DUID
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#define DUID_LEN 130
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#define THIRTY_YEARS_IN_SECONDS 946707779
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void get_duid (interface_t *iface)
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{
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FILE *fp;
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uint16_t type = 0;
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uint16_t hw = 0;
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uint32_t ul;
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time_t t;
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unsigned char *p = iface->duid;
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int x = 0;
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if (! iface)
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return;
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/* Remove any existing */
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iface->duid[0] = '\0';
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iface->duid_length = 0;
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/* If we already have a DUID then use it as it's never supposed
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* to change once we have one even if the interfaces do */
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if ((fp = fopen (DUIDFILE, "r"))) {
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char *fduid;
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char *fdp;
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fduid = fdp = xmalloc ((sizeof (char *) * DUID_LEN * 2) + 1);
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if (fscanf (fp, "%260s", fduid) == 1) {
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char c[3];
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c[2] = '\0';
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while (*fdp) {
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c[0] = *fdp++;
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c[1] = *fdp++;
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*p++ = (char) strtol (c, NULL, 16);
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}
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}
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free (fduid);
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iface->duid_length = p - iface->duid;
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fclose (fp);
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return;
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}
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if (errno != ENOENT) {
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logger (LOG_ERR, "fopen `%s': %s", DUIDFILE, strerror (errno));
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return;
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}
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/* No file? OK, lets make one based on our interface */
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type = htons (1); /* DUI-D-LLT */
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memcpy (p, &type, 2);
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p += 2;
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hw = htons (iface->family);
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memcpy (p, &hw, 2);
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p += 2;
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/* time returns seconds from jan 1 1970, but DUID-LLT is
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* seconds from jan 1 2000 modulo 2^32 */
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t = time (NULL) - THIRTY_YEARS_IN_SECONDS;
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ul = htonl (t & 0xffffffff);
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memcpy (p, &ul, 4);
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p += 4;
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/* Finally, add the MAC address of the interface */
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memcpy (p, iface->hwaddr, iface->hwlen);
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p += iface->hwlen;
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iface->duid_length = p - iface->duid;
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if (! (fp = fopen (DUIDFILE, "w")))
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logger (LOG_ERR, "fopen `%s': %s", DUIDFILE, strerror (errno));
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else {
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int i;
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for (i = 0; i < iface->duid_length; i++)
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x += fprintf (fp, "%.2X", iface->duid[i]);
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fprintf (fp, "\n");
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fclose (fp);
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}
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/* Failed to write the duid? scrub it, we cannot use it */
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if (x < 1) {
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memset (iface->duid, 0, sizeof (iface->duid));
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iface->duid_length = 0;
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}
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}
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#endif
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