We now do ARP checking by default as recommended by RFC 2131.

Add RFC 3927 (aka IPV4LL aka APIPA) support by default.

1 files changed, 63 insertions, 0 deletions

diff --git a/ipv4ll.c b/ipv4ll.c
new file mode 100644
index 00000000..bb6a7b1f
--- /dev/null
+++ b/ipv4ll.c
@@ -0,0 +1,63 @@
+/*
+ * dhcpcd - DHCP client daemon -
+ * Copyright 2006-2007 Roy Marples <uberlord@gentoo.org>
+ *
+ * dhcpcd is an RFC2131 compliant DHCP client daemon.
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <errno.h>
+#include <stdlib.h>
+
+#include "config.h"
+#include "arp.h"
+#include "ipv4ll.h"
+
+#ifdef ENABLE_IPV4LL
+
+#ifndef ENABLE_ARP
+#error IPV4LL requires ARP
+#endif
+
+#define IPV4LL_LEASETIME 10 
+
+int ipv4ll_get_address (interface_t *iface, dhcp_t *dhcp) {
+	struct in_addr addr;
+
+	while (1) {
+		addr.s_addr = htonl (LINKLOCAL_ADDR |
+							 ((abs (random ()) % 0xFD00) + 0x0100));
+		errno = 0;
+		if (! arp_claim (iface, addr))
+			break;
+		/* Our ARP may have been interrupted */
+		if (errno == EINTR)
+			return (-1);
+	}
+
+	dhcp->address.s_addr = addr.s_addr;
+	dhcp->netmask.s_addr = htonl (LINKLOCAL_MASK);
+	dhcp->broadcast.s_addr = htonl (LINKLOCAL_BRDC);
+
+	/* Finally configure some DHCP like lease times */
+	dhcp->leasetime = IPV4LL_LEASETIME;
+	dhcp->renewaltime = (dhcp->leasetime * 0.5);
+	dhcp->rebindtime = (dhcp->leasetime * 0.875);
+
+	return (0);
+}
+
+#endif