1 files changed, 118 insertions, 0 deletions
diff --git a/src/customdhcpcd/duid.c b/src/customdhcpcd/duid.c
new file mode 100644
index 0000000..e4dd83b
--- /dev/null
+++ b/src/customdhcpcd/duid.c
@@ -0,0 +1,118 @@
+/* 
+ * 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