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diff --git a/openvpn/tap-win32/dhcp.h b/openvpn/tap-win32/dhcp.h
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+/*
+ * TAP-Win32 -- A kernel driver to provide virtual tap device functionality
+ * on Windows. Originally derived from the CIPE-Win32
+ * project by Damion K. Wilson, with extensive modifications by
+ * James Yonan.
+ *
+ * All source code which derives from the CIPE-Win32 project is
+ * Copyright (C) Damion K. Wilson, 2003, and is released under the
+ * GPL version 2 (see below).
+ *
+ * All other source code is Copyright (C) 2002-2005 OpenVPN Solutions LLC,
+ * and is released under the GPL version 2 (see below).
+ *
+ * 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
+ */
+
+#pragma pack(1)
+
+//===================================================
+// How many bad DHCPREQUESTs do we receive before we
+// return a NAK?
+//
+// A bad DHCPREQUEST is defined to be one where the
+// requestor doesn't know its IP address.
+//===================================================
+
+#define BAD_DHCPREQUEST_NAK_THRESHOLD 3
+
+//==============================================
+// Maximum number of DHCP options bytes supplied
+//==============================================
+
+#define DHCP_USER_SUPPLIED_OPTIONS_BUFFER_SIZE 256
+#define DHCP_OPTIONS_BUFFER_SIZE 256
+
+//===================================
+// UDP port numbers of DHCP messages.
+//===================================
+
+#define BOOTPS_PORT 67
+#define BOOTPC_PORT 68
+
+//===========================
+// The DHCP message structure
+//===========================
+
+typedef struct {
+# define BOOTREQUEST 1
+# define BOOTREPLY 2
+ UCHAR op; /* message op */
+
+ UCHAR htype; /* hardware address type (e.g. '1' = 10Mb Ethernet) */
+ UCHAR hlen; /* hardware address length (e.g. '6' for 10Mb Ethernet) */
+ UCHAR hops; /* client sets to 0, may be used by relay agents */
+ ULONG xid; /* transaction ID, chosen by client */
+ USHORT secs; /* seconds since request process began, set by client */
+ USHORT flags;
+ ULONG ciaddr; /* client IP address, client sets if known */
+ ULONG yiaddr; /* 'your' IP address -- server's response to client */
+ ULONG siaddr; /* server IP address */
+ ULONG giaddr; /* relay agent IP address */
+ UCHAR chaddr[16]; /* client hardware address */
+ UCHAR sname[64]; /* optional server host name */
+ UCHAR file[128]; /* boot file name */
+ ULONG magic; /* must be 0x63825363 (network order) */
+} DHCP;
+
+typedef struct {
+ ETH_HEADER eth;
+ IPHDR ip;
+ UDPHDR udp;
+ DHCP dhcp;
+} DHCPPre;
+
+typedef struct {
+ DHCPPre pre;
+ UCHAR options[DHCP_OPTIONS_BUFFER_SIZE];
+} DHCPFull;
+
+typedef struct {
+ unsigned int optlen;
+ BOOLEAN overflow;
+ DHCPFull msg;
+} DHCPMsg;
+
+//===================
+// Macros for DHCPMSG
+//===================
+
+#define DHCPMSG_LEN_BASE(p) (sizeof (DHCPPre))
+#define DHCPMSG_LEN_OPT(p) ((p)->optlen)
+#define DHCPMSG_LEN_FULL(p) (DHCPMSG_LEN_BASE(p) + DHCPMSG_LEN_OPT(p))
+#define DHCPMSG_BUF(p) ((UCHAR*) &(p)->msg)
+#define DHCPMSG_OVERFLOW(p) ((p)->overflow)
+
+//========================================
+// structs to hold individual DHCP options
+//========================================
+
+typedef struct {
+ UCHAR type;
+} DHCPOPT0;
+
+typedef struct {
+ UCHAR type;
+ UCHAR len;
+ UCHAR data;
+} DHCPOPT8;
+
+typedef struct {
+ UCHAR type;
+ UCHAR len;
+ ULONG data;
+} DHCPOPT32;
+
+#pragma pack()
+
+//==================
+// DHCP Option types
+//==================
+
+#define DHCP_MSG_TYPE 53 /* message type (u8) */
+#define DHCP_PARM_REQ 55 /* parameter request list: c1 (u8), ... */
+#define DHCP_CLIENT_ID 61 /* client ID: type (u8), i1 (u8), ... */
+#define DHCP_IP 50 /* requested IP addr (u32) */
+#define DHCP_NETMASK 1 /* subnet mask (u32) */
+#define DHCP_LEASE_TIME 51 /* lease time sec (u32) */
+#define DHCP_RENEW_TIME 58 /* renewal time sec (u32) */
+#define DHCP_REBIND_TIME 59 /* rebind time sec (u32) */
+#define DHCP_SERVER_ID 54 /* server ID: IP addr (u32) */
+#define DHCP_PAD 0
+#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
+
+#if DBG
+
+VOID
+DumpDHCP (const ETH_HEADER *eth,
+ const IPHDR *ip,
+ const UDPHDR *udp,
+ const DHCP *dhcp,
+ const int optlen);
+
+#endif