/* *  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) James Yonan, 2003-2004, *  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 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 (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 DBGVOIDDumpDHCP (const ETH_HEADER *eth,	  const IPHDR *ip,	  const UDPHDR *udp,	  const DHCP *dhcp,	  const int optlen);#endif