How to get DNS without reading the registry

bravebee

How to get DNS value without reading the registry

huhustar

DWORD GetNetworkParams (
  PFIXED_INFO pFixedInfo,
  PULONG pOutBufLen
);

#include <stdio.h>
#include <windows.h>
#include <iphlpapi.h>

#program comment (lib, "iphlpapi.lib")

main () {
   
   FIXED_INFO * FixedInfo;
   ULONG ulOutBufLen;
   DWORD dwRetVal;
   IP_ADDR_STRING * pIPAddr;

   FixedInfo = (FIXED_INFO *) GlobalAlloc (GPTR, sizeof (FIXED_INFO));
   ulOutBufLen = sizeof (FIXED_INFO);
   
   if (ERROR_BUFFER_OVERFLOW == GetNetworkParams (FixedInfo,&ulOutBufLen)) {
      GlobalFree (FixedInfo);
      FixedInfo = (FIXED_INFO *) GlobalAlloc (GPTR, ulOutBufLen);
   }

   if (dwRetVal = GetNetworkParams (FixedInfo,&ulOutBufLen)) {
        printf ("Call to GetNetworkParams failed. Return Value:% 08x\n", dwRetVal);
   }
   else {
      printf ("Host Name:% s\n", FixedInfo-> HostName);
      printf ("Domain Name:% s\n", FixedInfo-> DomainName);
      
      printf ("DNS Servers:\n");
      printf ("\t% s\n", FixedInfo-> DnsServerList.IpAddress.String);
      
      pIPAddr = FixedInfo-> DnsServerList.Next;
      while (pIPAddr) {
         printf ("\t% s\n", pIPAddr-> IpAddress.String);
         pIPAddr = pIPAddr-> Next;
      }
   }
   exit (0);
}
To install sdk

bravebee

This seems to only get one DNS, what if it is a dual network card?

huhustar

I tried two network cards.

smilingamao

That's it