网络协议课设

#include "pcap.h"  
#include<remote-ext.h>
#ifndef WIN32
#include <sys/socket.h>
#include <netinet/in.h>
#else
#include <winsock.h>
#endif

#include<conio.h>
#include<windows.h>
#include<time.h>

#define IPTOSBUFFERS    12



//全局变量
int ii = 0;
pcap_t *adhandle;
struct pcap_stat pkt_stat;

/* 4字节的IP地址 */

typedef struct ip_address{
u_char byte1;
u_char byte2;
u_char byte3;
u_char byte4;
}ip_address;

/* IPv4 首部 */
typedef struct ip_header{
u_char  ver_ihl;        // 版本 (4 bits) + 首部长度 (4 bits)  
u_char  tos;            // 服务类型(Type of service)   
u_short tlen;           // 总长(Total length)   
u_short identification; // 标识(Identification)  
u_short flags_fo;       // 标志位(Flags) (3 bits) + 段偏移量(Fragment offset) (13 bits)  
u_char  ttl;            // 存活时间(Time to live)  
u_char  proto;          // 协议(Protocol)  
u_short crc;            // 首部校验和(Header checksum)  
ip_address  saddr;      // 源地址(Source address)  
ip_address  daddr;      // 目的地址(Destination address)  
u_int   op_pad;         // 选项与填充(Option + Padding)  
}ip_header;

/* UDP 首部*/
typedef struct udp_header{
u_short sport;          // 源端口(Source port)  
u_short dport;          // 目的端口(Destination port)  
u_short len;            // UDP数据包长度(Datagram length)  
u_short crc;            // 校验和(Checksum)  
}udp_header;

/* 回调函数原型 */
void packet_handler(u_char *param, const struct pcap_pkthdr *header, const u_char *pkt_data);
char *iptos(u_long in);

/*设置一个观察变量表示是否暂停抓包*/
bool ispause = false;