Add an event loop.

Split client.c into smaller files and functions and
recode around the event loop.
Add multiple interface support using the new event loop.
Document changes and outstanding bugs.

1 files changed, 106 insertions, 0 deletions

diff --git a/duid.c b/duid.c
new file mode 100644
index 00000000..8b19550a
--- /dev/null
+++ b/duid.c
@@ -0,0 +1,106 @@
+/* 
+ * 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.
+ */
+
+#define THIRTY_YEARS_IN_SECONDS    946707779
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.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, l = 0;
+	char *buffer = NULL, *line, *option;
+
+	/* 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 ((get_line(&buffer, &len, f))) {
+			line = buffer;
+			while ((option = strsep(&line, " \t")))
+				if (*option != '\0')
+					break;
+			if (!option || *option == '\0' || *option == '#')
+				continue;
+			l = hwaddr_aton(NULL, option);
+			if (l && l <= DUID_LEN) {
+				hwaddr_aton(duid, option);
+				break;
+			}
+			l = 0;
+		}
+		fclose(f);
+		free(buffer);
+		if (l)
+			return l;
+	} 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;
+}