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diff --git a/src/openvpn/dhcp.h b/src/openvpn/dhcp.h
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+/*
+ * OpenVPN -- An application to securely tunnel IP networks
+ * over a single TCP/UDP port, with support for SSL/TLS-based
+ * session authentication and key exchange,
+ * packet encryption, packet authentication, and
+ * packet compression.
+ *
+ * Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * 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 (see the file COPYING included with this
+ * distribution); if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef DHCP_H
+#define DHCP_H
+
+#include "common.h"
+#include "buffer.h"
+#include "proto.h"
+
+#pragma pack(1)
+
+/* DHCP Option types */
+#define DHCP_PAD 0
+#define DHCP_ROUTER 3
+#define DHCP_MSG_TYPE 53 /* message type (u8) */
+#define DHCP_END 255
+
+/* DHCP Messages types */
+#define DHCPDISCOVER 1
+#define DHCPOFFER 2
+#define DHCPREQUEST 3
+#define DHCPDECLINE 4
+#define DHCPACK 5
+#define DHCPNAK 6
+#define DHCPRELEASE 7
+#define DHCPINFORM 8
+
+/* DHCP UDP port numbers */
+#define BOOTPS_PORT 67
+#define BOOTPC_PORT 68
+
+struct dhcp {
+# define BOOTREQUEST 1
+# define BOOTREPLY 2
+ uint8_t op; /* message op */
+
+ uint8_t htype; /* hardware address type (e.g. '1' = 10Mb Ethernet) */
+ uint8_t hlen; /* hardware address length (e.g. '6' for 10Mb Ethernet) */
+ uint8_t hops; /* client sets to 0, may be used by relay agents */
+ uint32_t xid; /* transaction ID, chosen by client */
+ uint16_t secs; /* seconds since request process began, set by client */
+ uint16_t flags;
+ uint32_t ciaddr; /* client IP address, client sets if known */
+ uint32_t yiaddr; /* 'your' IP address -- server's response to client */
+ uint32_t siaddr; /* server IP address */
+ uint32_t giaddr; /* relay agent IP address */
+ uint8_t chaddr[16]; /* client hardware address */
+ uint8_t sname[64]; /* optional server host name */
+ uint8_t file[128]; /* boot file name */
+ uint32_t magic; /* must be 0x63825363 (network order) */
+};
+
+struct dhcp_full {
+ struct openvpn_iphdr ip;
+ struct openvpn_udphdr udp;
+ struct dhcp dhcp;
+# define DHCP_OPTIONS_BUFFER_SIZE 256
+ uint8_t options[DHCP_OPTIONS_BUFFER_SIZE];
+};
+
+#pragma pack()
+
+in_addr_t dhcp_extract_router_msg (struct buffer *ipbuf);
+
+#endif