public static void DhcpCreateClientInfo(string ServerIpAddress, DhcpClient dhcpClient)
{
DHCP_CLIENT_INFO clientInfo = ConvertClientInfoToNative(dhcpClient);
int error = dhcpsapimethods.DhcpCreateClientInfo(ServerIpAddress, ref clientInfo);
if (error != 0)
{
Console.WriteLine(error);
Console.ReadLine();
}
}
static ArrayList findDhcpClients(string server, string subnet)
{
// set up container for processed clients
ArrayList foundClients = new ArrayList();
// make call to unmanaged code
uint parsedMask = StringIPAddressToUInt32(subnet);
uint resumeHandle = 0;
uint numClientsRead = 0;
uint totalClients = 0;
IntPtr info_array_ptr;
uint response = DhcpEnumSubnetClients(
server,
parsedMask,
ref resumeHandle,
65536,
out info_array_ptr,
ref numClientsRead,
ref totalClients
);
// set up client array casted to a DHCP_CLIENT_INFO_ARRAY
// using the pointer from the response object above
DHCP_CLIENT_INFO_ARRAY rawClients =
(DHCP_CLIENT_INFO_ARRAY)Marshal.PtrToStructure(info_array_ptr, typeof(DHCP_CLIENT_INFO_ARRAY));
// loop through the clients structure inside rawClients
// adding to the dchpClient collection
IntPtr current = rawClients.Clients;
for (int i = 0; i < (int)rawClients.NumElements; i++)
{
// 1. Create machine object using the struct
DHCP_CLIENT_INFO rawMachine =
(DHCP_CLIENT_INFO)Marshal.PtrToStructure(Marshal.ReadIntPtr(current), typeof(DHCP_CLIENT_INFO));
// 2. create new C# dhcpClient object and add to the
// collection (for hassle-free use elsewhere!!)
dhcpClient thisClient = new dhcpClient();
thisClient.ip = UInt32IPAddressToString(rawMachine.ip);
thisClient.hostname = rawMachine.ClientName;
thisClient.mac = String.Format("{0:x2}{1:x2}.{2:x2}{3:x2}.{4:x2}{5:x2}",
Marshal.ReadByte(rawMachine.mac.Data),
Marshal.ReadByte(rawMachine.mac.Data, 1),
Marshal.ReadByte(rawMachine.mac.Data, 2),
Marshal.ReadByte(rawMachine.mac.Data, 3),
Marshal.ReadByte(rawMachine.mac.Data, 4),
Marshal.ReadByte(rawMachine.mac.Data, 5));
foundClients.Add(thisClient);
// 3. move pointer to next machine
current = (IntPtr)((int)current + (int)Marshal.SizeOf(typeof(IntPtr)));
}
return(foundClients);
}
public static DHCP_CLIENT_INFO ConvertClientInfoToNative(DhcpClient client)
{
DHCP_CLIENT_INFO ClientInfo = new DHCP_CLIENT_INFO();
ClientInfo.ClientIpAddress = StringToUint(client.ClientIpAddress);
ClientInfo.SubnetMask = StringToUint(client.SubnetMask);
ClientInfo.ClientHardwareAddress = ConverToNativeMac(client.ClientHardwareAddress);
ClientInfo.ClientName = client.ClientName;
ClientInfo.ClientComment = client.ClientComment;
ClientInfo.ClientLeaseExpires = ConvertDateTimeToNative(client);
DHCP_HOST_INFO host = new DHCP_HOST_INFO();
host.HostName = client.OwnerHost.HostName;
host.IpAddress = StringToUint(client.OwnerHost.IpAddress);
host.NetBiosName = client.OwnerHost.NetBiosName;
ClientInfo.OwnerHost = host;
return(ClientInfo);
}
public static extern int DhcpCreateClientInfo(
string IpAddress,
ref DHCP_CLIENT_INFO ClientInfo);
public static extern int DhcpCreateClientInfo(
string IpAddress,
ref DHCP_CLIENT_INFO ClientInfo);
public static DHCP_CLIENT_INFO ConvertClientInfoToNative(DhcpClient client)
{
DHCP_CLIENT_INFO ClientInfo = new DHCP_CLIENT_INFO();
ClientInfo.ClientIpAddress = StringToUint(client.ClientIpAddress);
ClientInfo.SubnetMask = StringToUint(client.SubnetMask);
ClientInfo.ClientHardwareAddress = ConverToNativeMac(client.ClientHardwareAddress);
ClientInfo.ClientName = client.ClientName;
ClientInfo.ClientComment = client.ClientComment;
ClientInfo.ClientLeaseExpires = ConvertDateTimeToNative(client);
DHCP_HOST_INFO host = new DHCP_HOST_INFO();
host.HostName = client.OwnerHost.HostName;
host.IpAddress = StringToUint(client.OwnerHost.IpAddress);
host.NetBiosName = client.OwnerHost.NetBiosName;
ClientInfo.OwnerHost = host;
return ClientInfo;
}
