Domain-KillSwitch

Domain-KillSwitch

domain-killswitch.c

#include <Windows.h>
#include <stdio.h>
#include <windns.h>
#pragma comment(lib, "dnsapi.lib")

/*
    Checks whether a domain resolves via DNS A record lookup.
*/
BOOL DomainCheck(_In_ PCSTR DomainName) {
    if (!DomainName)
        return FALSE;

    DNS_STATUS Status = DnsQuery_A(DomainName, DNS_TYPE_A, DNS_QUERY_STANDARD, NULL, NULL, NULL);
    if (Status == ERROR_SUCCESS) {
        printf("[+] Domain exists: %s \n", DomainName);
        return TRUE;
    }

    printf("[!] Domain not found or query failed: %s (Status: %d) \n", DomainName, Status);
    return FALSE;
}

int main() {
    DomainCheck("microsoft.com");
    return 0;
}