static string GetSubnet(string sIP, string sDC)
{
IntPtr pSiteNames;
IntPtr pSubnetNames;
SOCKET_ADDRESS[] SocketAddresses = new SOCKET_ADDRESS[1];
String[] ipArray = sIP.Split('.');
if (ipArray.Length < 4)
{
return(null);
}
SockAddr_In sockAddr;
sockAddr.sin_family = 2;
sockAddr.sin_port = 0;
sockAddr.sin_addr = new byte[4] {
byte.Parse(ipArray[0]), byte.Parse(ipArray[1]), byte.Parse(ipArray[2]), byte.Parse(ipArray[3])
};
sockAddr.sin_zero = new byte[8] {
0, 0, 0, 0, 0, 0, 0, 0
};
SocketAddresses[0].iSockaddrLength = Marshal.SizeOf(sockAddr);
IntPtr pSockAddr = Marshal.AllocHGlobal(16);
Marshal.StructureToPtr(sockAddr, pSockAddr, true);
SocketAddresses[0].lpSockaddr = pSockAddr;
if (DsAddressToSiteNamesEx(
sDC,
1,//EntryCount
SocketAddresses,
out pSiteNames,
out pSubnetNames) == ERROR_SUCCESS)
{
string sSite = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(pSiteNames, 0));
string sSubnet = Marshal.PtrToStringAuto(Marshal.ReadIntPtr(pSubnetNames, 0));
NetApiBufferFree(pSubnetNames);
NetApiBufferFree(pSiteNames);
Console.WriteLine("[GetSubnet] Subnet found: " + sSubnet);
Console.WriteLine("[GetSubnet] Site found: " + sSite);
return(sSubnet);
}
else
{
Console.WriteLine("[GetSubnet] No subnet found!");
return(null);
}
}
public static System.Net.IPAddress Convert(this SOCKET_ADDRESS sockAddr)
{
switch ((ADDRESS_FAMILY)Marshal.ReadInt16(sockAddr.lpSockAddr))
{
case ADDRESS_FAMILY.AF_INET:
return(new System.Net.IPAddress((long)sockAddr.lpSockAddr.ToStructure <SOCKADDR_IN>().sin_addr));
case ADDRESS_FAMILY.AF_INET6:
return(new System.Net.IPAddress(sockAddr.lpSockAddr.ToStructure <SOCKADDR_IN6>().sin6_addr));
default:
throw new Exception("Non-IP address family");
}
}
