#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
//#include?
#include?
#include?
#include?“nids.h“

#define?int_ntoa（x）	inet_ntoa（*（（struct?in_addr?*）&x））

char?ip[32];
int?minport;
int?maxport;
struct?sockaddr_in?target;
struct?sockaddr_in?myaddr;
struct?sockaddr_in?target2;
struct?sockaddr_in?myaddr2;
int?sockfd?;
int?sockfd2?;
int?flag=0;
pthread_t?pth?;
pthread_t?pth2?;
pthread_t?pth3?;
pthread_t?pth4?;
int?panduan[65536];

char?*adres?（struct?tuple4?addr）
{
??static?char?buf[256];
??strcpy?（buf?int_ntoa?（addr.saddr））;
??sprintf?（buf?+?strlen?（buf）?“%i“?addr.source）;
??strcat?（buf?int_ntoa?（addr.daddr））;
??sprintf?（buf?+?strlen?（buf）?“%i“?addr.dest）;
??return?buf;
}
//定義TCP偽報頭
typedef?struct?psd_hdr
{
	unsigned?long?saddr;?//源地址
	unsigned?long?daddr;?//目的地址
	char?mbz;?char?ptcl;?//協議類型
	unsigned?short?tcpl;?//TCP長度

}PSD_HEADER;

//定義TCP報頭
typedef?struct?_tcpheadr
{
	unsigned?short?th_sport;?//16位源端口
	unsigned?short?th_dport;?//16位目的端口
	unsigned?int?th_seq;?//32位序列號
	unsigned?int?th_ack;?//32位確認號
	unsigned?char?th_lenres;?//4位首部長度/4位保留字
	unsigned?char?th_flag;?//6位標志位
	unsigned?short?th_win;?//16位窗口大小
	unsigned?short?th_sum;?//16位校驗和
	unsigned?short?th_urp;?//16位緊急數據偏移量

}?TCP_HEADER;


//定義IP報頭
typedef?struct?_ipheadr
{
	unsigned?char?h_lenver?;?//長度加版本號
	unsigned?char?tos;
	unsigned?short?total_len;
	unsigned?short?ident;
	unsigned?short?frag_and_flags;
	unsigned?char?ttl;
	unsigned?char?proto;
	unsigned?short?checksum;
	unsigned?int?sourceIP;
	unsigned?int?destIP;

}?IP_HEADER;

//checksum
unsigned?short?checksum（unsigned?short?*addrint?len）{
		int?nleft=len;
	???int?sum=0;
	???unsigned?short?*?w=addr;
	???unsigned?short?answer=0;

	???while?（nleft>1）
	???{
	?????sum+=*w++;
	?????nleft-=2;
	???}

	???if?（nleft==1）
	???{
	?????*（unsigned?char?*）（&answer）=*（unsigned?char?*）w;
	?????sum+=answer;
	???}

	???sum=（sum>>16）+（sum?&?0xffff）;
	???sum+=（sum>>16）;
	???answer=~sum;
	???return（answer）;
}

void?TCP_Send（int?portunsigned?char?flag）{

		//設置目標端口
		target.sin_port?=?htons（port）?;

		//構造包
		char?buffer[1024]?;
		memset（buffer01024）?;
		struct?_tcpheadr?tcpHeader?;
		struct?psd_hdr?psdHeader?;

		//填充TCP
		//目的端口
		tcpHeader.th_dport?=?htons（port）?;
		//源端口
		tcpHeader.th_sport?=?htons（60000）?;
		//序列號？？
		tcpHeader.th_seq?=?htonl（0x1245678）;
		//確認號
		tcpHeader.th_ack?=?0;
		//（4位首部長度/4位保留字）
		tcpHeader.th_lenres?=?（sizeof（tcpHeader）?/?4?<		//SYN標志
		tcpHeader.th_flag?=?flag?;//SYN
		//滑動窗口
		tcpHeader.th_win?=?htons（16384）?;
		//16位緊急數據偏移量
		tcpHeader.th_urp?=?0;
		//16位校驗和
		tcpHeader.th_sum?=?0;

		//psdheader