Interop.cs

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using System;
using System.Runtime.InteropServices;
 
internal static class Interop
{
    internal static class IpHlpApi
    {
        public struct FIXED_INFO
        {
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 132)]
            public string hostName;
 
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 132)]
            public string domainName;
 
            public IntPtr currentDnsServer;
 
            public IP_ADDR_STRING DnsServerList;
 
            public uint nodeType;
 
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
            public string scopeId;
 
            public bool enableRouting;
 
            public bool enableProxy;
 
            public bool enableDns;
        }
 
        public struct IP_ADDR_STRING
        {
            public IntPtr Next;
 
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 16)]
            public string IpAddress;
 
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 16)]
            public string IpMask;
 
            public uint Context;
        }
 
        [DllImport("iphlpapi.dll", ExactSpelling = true)]
        internal static extern uint GetNetworkParams(IntPtr pFixedInfo, ref uint pOutBufLen);
 
        [DllImport("iphlpapi.dll", SetLastError = true)]
        internal static extern uint if_nametoindex(string name);
    }
}