mirror of
https://github.com/rsmarples/dhcpcd.git
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118 lines
3.3 KiB
C
118 lines
3.3 KiB
C
/*
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* dhcpcd - DHCP client daemon
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* Copyright (c) 2006-2008 Roy Marples <roy@marples.name>
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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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#define DUID_TIME_EPOCH 946684800
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#define DUID_LLT 1
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#define DUID_LL 3
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <time.h>
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#include <unistd.h>
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#include "common.h"
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#include "duid.h"
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#include "net.h"
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static size_t
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make_duid(unsigned char *duid, const struct interface *ifp, uint16_t type)
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{
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unsigned char *p;
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uint16_t u16;
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time_t t;
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uint32_t u32;
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p = duid;
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u16 = htons(type);
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memcpy(p, &u16, 2);
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p += 2;
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u16 = htons(ifp->family);
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memcpy(p, &u16, 2);
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p += 2;
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if (type == DUID_LLT) {
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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) - DUID_TIME_EPOCH;
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u32 = htonl(t & 0xffffffff);
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memcpy(p, &u32, 4);
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p += 4;
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}
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/* Finally, add the MAC address of the interface */
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memcpy(p, ifp->hwaddr, ifp->hwlen);
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p += ifp->hwlen;
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return p - duid;
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}
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size_t
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get_duid(unsigned char *duid, const struct interface *ifp)
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{
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FILE *f;
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int x = 0;
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size_t len = 0;
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char *line;
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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 ((f = fopen(DUID, "r"))) {
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while ((line = get_line(f))) {
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len = hwaddr_aton(NULL, line);
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if (len && len <= DUID_LEN) {
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hwaddr_aton(duid, line);
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break;
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}
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len = 0;
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}
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fclose(f);
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if (len)
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return len;
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} else {
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if (errno != ENOENT) {
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syslog(LOG_ERR, "error reading DUID: %s: %m", DUID);
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return make_duid(duid, ifp, DUID_LL);
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}
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}
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/* No file? OK, lets make one based on our interface */
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if (!(f = fopen(DUID, "w"))) {
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syslog(LOG_ERR, "error writing DUID: %s: %m", DUID);
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return make_duid(duid, ifp, DUID_LL);
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}
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len = make_duid(duid, ifp, DUID_LLT);
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x = fprintf(f, "%s\n", hwaddr_ntoa(duid, len));
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fclose(f);
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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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syslog(LOG_ERR, "error writing DUID: %s: %m", DUID);
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unlink(DUID);
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return make_duid(duid, ifp, DUID_LL);
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}
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return len;
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}
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