packetheader.h

发送ARP数据包的程序

///-----------------------------
//数据包头结构体
//方便构造各类数据包头
//Author：Rex Ding
//#include "packetHeader.h"
///-----------------------------

//#include "pcap.h"

typedef struct ip_address		//IP地址的结构体形式
{
	u_char byte1;
	u_char byte2;
	u_char byte3;
	u_char byte4;
}ip_address;

typedef struct EtherHeader		//数据链路层头部，以太网下14字节
{
	unsigned char    DesMAC[6];    /* destination HW addrress */
	unsigned char    SrcMAC[6];    /* source HW addresss */
	unsigned short   Ethertype;    /* ethernet type */
}ether_header;

typedef struct IPHeader			//IP层头部20字节
{
	u_char	ver_ihl;		// Version (4 bits) + Internet header length (4 bits)
	u_char	tos;			// Type of service 
	u_short tlen;			// Total length 
	u_short identification; // Identification
	u_short flags_fo;		// Flags (3 bits) + Fragment offset (13 bits)
	u_char	ttl;			// Time to live
	u_char	proto;			// Protocol
	u_short crc;			// Header checksum
	ip_address	saddr;		// Source address
	ip_address	daddr;		// Destination address
	u_int	op_pad;			// Option + Padding
}ip_header;

typedef struct UDPHeader		//UDP头部8字节
{
	u_short sport;			// Source port
	u_short dport;			// Destination port
	u_short len;			// Datagram length
	u_short crc;			// Checksum
}udp_header;

typedef struct DHCPHeader		//DHCP报文236字节+4字节MagicCookie
{
	u_char OP;				//应答模式
	u_char h_type;			//硬件类型
	u_char h_len;			//硬件长度
	u_char hops;			//DHCP RELAY的跳数
	u_int xid;				//事务ID
	u_short seconds;		//经过的秒数
	u_short flags;			//标志位
	u_long ciaddr;			//客户机地址
	u_long yiaddr;			//服务器给你的地址
	u_long sevraddr;		//服务器的地址
	u_long giaddr;			//中继地址
	u_char chaddr[16];		//客户机硬件地址
	u_char servername[64];	//服务器名字
	u_char file[128];		//启动文件
	//选项字段---表示DHCP的各种操作，不定长
	//u_int magcookie;			//BOOTP头部

}dhcp_header;

//DHCP Option内容
typedef struct DHCPMess		//DHCP报文消息类型3字节
{
	u_char code;
	u_char len;
	u_char value;
}dhcpmessage;

typedef struct ClientIdentifier		//DHCP客户端标示8字节
{
	u_char code;
	u_char len;
	u_char ClientMAC[6];
}clientID;

typedef struct ServerIdentifier		//DHCP服务端标示6字节
{
	u_char code;
	u_char len;
	u_long SerIPaddr;
}serverID;

typedef struct LeaseTime		//DHCP服务端给的租约时间4字节
{
	u_char code;
	u_char len;
	u_int time;
}lease_time;

//typedef struct RPL		//DHCP请求IP地址6字节
//{
//	u_char code;
//	u_char len;
//	u_char SUBNETMASK;
//	u_char BROADCASTADDR;
//	u_char TIMEOFFSET;
//	u_char ROUTER;
//	u_char DOMAINNAME;
//	u_char DHCP_DNS;
//	u_char HOSTNAME;
//}requestPL;

//typedef struct RequestIP		//DHCP请求IP地址6字节
//{
//	u_char code;
//	u_char len;
//	ip_address reqIPaddr;
//}requestIP;

typedef struct DHCPOption	//DHCP选项字段		
{
	u_long magcookie;			//BOOTP头部
	dhcpmessage dhcpmess;
}dhcpoption;

typedef struct Offer_Option	//DHCP选项字段		
{	
	u_long magcookie;		//BOOTP头部4字节
	dhcpmessage dhcpmess;	//3字节
	serverID server_id;		//code+len2字节+4字节ip
}offer_op;

typedef struct ACK_Option	//DHCP选项字段		
{	
	u_long magcookie;			//BOOTP头部
	dhcpmessage dhcpmess;
	serverID server_id;
	lease_time lease_ti;
}ack_op;

typedef struct TCPHeader			//TCP层头部20字节
{
	u_short tcp_src_port;		//Source port
	u_short tcp_dst_port;		//Destination port
	u_long tcp_sequence;		//序号
	u_long tcp_ack;			//确认号
	u_char tcp_unknow;		//未知比特
	u_char tcp_flag;			//标志比特
	u_short tcp_window;		//窗口大小
	u_short tcp_checksum;		//校验和
	u_short tcp_urgent_pointer;//紧急指针
}tcp_header;

typedef struct ARPHeader			//ARP数据帧结构
{
	u_short arp_hardware_type;		//硬件地址类型
	u_short arp_protocol_type;		//协议地址类型
	u_char arp_hardware_lenth;		//硬件地址lenth
	u_char arp_protocol_lenth;		//协议地址lenth
	u_short arp_operation_code;		//操作类型
	u_char enet_src[6];				//源硬件地址
	u_long src_ip;					//源IP地址
	u_char enet_dst[6];				//源硬件地址
	u_long dst_ip;					//源IP地址
}arp_header;