mirror of
https://github.com/rsmarples/dhcpcd.git
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128 lines
3.4 KiB
C
128 lines
3.4 KiB
C
/*
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* dhcpcd - DHCP client daemon
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* Copyright 2006-2007 Roy Marples
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* All rights reserved
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <arpa/inet.h>
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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 <time.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 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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