private const ushort DELAY = 0x1388; // 5 s
public void Run(IPAddress iPAddress, string dns, string subnetMask, string serverIdentifier, string routerIP)
{
UpdateStatus($"IP address:\t{iPAddress}");
UpdateStatus($"DNS:\t{dns}");
UpdateStatus($"SUBMASK:\t{subnetMask}");
UpdateStatus($"SERVER IDENTIFIER:\t{serverIdentifier}");
UpdateStatus($"ROUTER IP:\t{routerIP}");
var server = new Dhcp(iPAddress);
UpdateStatus("SETTATO L'IP DEL SERVER");
server.ServerName = dns;
UpdateStatus("SETTATO IL DNS DEL SERVER");
server.BroadcastAddress = IPAddress.Broadcast.ToString();
UpdateStatus("SETTATO IN BROADCAST IL SERVER");
server.OnDataReceived += (sender, dhcpRequest) =>
{
UpdateStatus("GENERATO NUOVO EVENTO NEL SERVER");
try
{
var type = dhcpRequest.GetMsgType();
UpdateStatus($"TIPO DI RICHIESTA RICEVUTA DAL SERVER:\t{type}");
var ip = iPAddress;
var replyOptions = new DhcpReplyOptions();
UpdateStatus("SETTAGGIO DELLA RISPOSTA DAL SERVER IN CORSO...");
replyOptions.SubnetMask = IPAddress.Parse(subnetMask);
UpdateStatus($"SUBNETMASK:\t{replyOptions.SubnetMask}");
replyOptions.DomainName = server.ServerName;
UpdateStatus($"DOMAIN NAME:\t{replyOptions.DomainName}");
replyOptions.ServerIdentifier = IPAddress.Parse(serverIdentifier);
UpdateStatus($"SERVER IDENTIFIER:\t{replyOptions.ServerIdentifier}");
replyOptions.RouterIP = IPAddress.Parse(routerIP);
UpdateStatus($"IP ROUTER:\t{replyOptions.RouterIP}");
replyOptions.DomainNameServers = new IPAddress[]
{ IPAddress.Parse("8.8.8.8"), IPAddress.Parse("8.8.4.4") };
UpdateStatus("CONFIGURAZIONE DEL DOMINIO DEL SERVER");
if (type == DhcpMsgType.DHCPDISCOVER)
{
UpdateStatus($"RISPOSTA\t->\tTIPO MESSAGGIO:{DhcpMsgType.DHCPOFFER}");
UpdateStatus($"RISPOSTA\t->\tIP:{ip}");
dhcpRequest.SendDHCPReply(DhcpMsgType.DHCPOFFER, ip, replyOptions);
}
if (type == DhcpMsgType.DHCPREQUEST)
{
UpdateStatus($"RISPOSTA\t->\tTIPO MESSAGGIO:{DhcpMsgType.DHCPACK}");
UpdateStatus($"RISPOSTA\t->\tIP:{ip}");
dhcpRequest.SendDHCPReply(DhcpMsgType.DHCPACK, ip, replyOptions);
}
}
catch (Exception e)
{
UpdateStatus($"EXCEPTION IN SERVER:\t{e.Message}");
}
};
UpdateStatus("ESECUZIONE DEL SERVER DHCP IN CORSO...");
server.Start();
}
private byte[] CreateOptionStruct(DhcpMsgType msgType, DhcpReplyOptions replyOptions, Dictionary <DhcpOption, byte[]> otherForceOptions, IEnumerable <DhcpOption> forceOptions)
{
Dictionary <DhcpOption, byte[]> options = new Dictionary <DhcpOption, byte[]>();
byte[] resultOptions = null;
// Requested options
var reqList = GetRequestedOptionsList();
// Option82?
var relayInfo = this.GetOptionData(DhcpOption.RelayInfo);
CreateOptionElement(ref resultOptions, DhcpOption.DHCPMessageTYPE, new byte[] { (byte)msgType });
// Server identifier - our IP address
if ((replyOptions != null) && (replyOptions.ServerIdentifier != null))
{
options[DhcpOption.ServerIdentifier] = replyOptions.ServerIdentifier.GetAddressBytes();
}
if (reqList == null && forceOptions != null)
{
reqList = new DhcpOption[0];
}
// Requested options
if ((reqList != null) && (replyOptions != null))
{
if (forceOptions == null)
{
forceOptions = new List <DhcpOption>();
}
}
foreach (DhcpOption i in reqList.Union(forceOptions).Distinct().OrderBy(x => (int)x))
{
byte[] optionData = null;
// If it's force option - ignore it. We'll send it later.
if ((otherForceOptions != null) && (otherForceOptions.TryGetValue(i, out optionData)))
{
continue;
}
switch (i)
{
case DhcpOption.SubnetMask:
if (replyOptions.SubnetMask != null)
{
optionData = replyOptions.SubnetMask.GetAddressBytes();
}
break;
case DhcpOption.Router:
if (replyOptions.RouterIP != null)
{
optionData = replyOptions.RouterIP.GetAddressBytes();
}
break;
case DhcpOption.DomainNameServers:
if (replyOptions.DomainNameServers != null)
{
optionData = new byte[] { };
foreach (var dns in replyOptions.DomainNameServers)
{
var dnsserv = dns.GetAddressBytes();
Array.Resize(ref optionData, optionData.Length + 4);
Array.Copy(dnsserv, 0, optionData, optionData.Length - 4, 4);
}
}
break;
case DhcpOption.DomainName:
if (!string.IsNullOrEmpty(replyOptions.DomainName))
{
optionData = System.Text.Encoding.ASCII.GetBytes(replyOptions.DomainName);
}
break;
case DhcpOption.ServerIdentifier:
if (replyOptions.ServerIdentifier != null)
{
optionData = replyOptions.ServerIdentifier.GetAddressBytes();
}
break;
case DhcpOption.LogServer:
if (replyOptions.LogServerIP != null)
{
optionData = replyOptions.LogServerIP.GetAddressBytes();
}
break;
case DhcpOption.StaticRoutes:
case DhcpOption.StaticRoutesWin:
if (replyOptions.StaticRoutes != null)
{
optionData = new byte[] { };
foreach (var route in replyOptions.StaticRoutes)
{
var routeData = route.BuildRouteData();
Array.Resize(ref optionData, optionData.Length + routeData.Length);
Array.Copy(routeData, 0, optionData, optionData.Length - routeData.Length, routeData.Length);
}
}
break;
default:
replyOptions.OtherRequestedOptions.TryGetValue(i, out optionData);
break;
}
if (optionData != null)
{
options[i] = optionData;
}
}
if (GetMsgType() != DhcpMsgType.DHCPINFORM)
{
// Lease time
if (replyOptions != null)
{
var leaseTime = new byte[4];
leaseTime[3] = (byte)(replyOptions.IPAddressLeaseTime);
leaseTime[2] = (byte)(replyOptions.IPAddressLeaseTime >> 8);
leaseTime[1] = (byte)(replyOptions.IPAddressLeaseTime >> 16);
leaseTime[0] = (byte)(replyOptions.IPAddressLeaseTime >> 24);
options[DhcpOption.IPAddressLeaseTime] = leaseTime;
if (replyOptions.RenewalTimeValue_T1.HasValue)
{
leaseTime[3] = (byte)(replyOptions.RenewalTimeValue_T1);
leaseTime[2] = (byte)(replyOptions.RenewalTimeValue_T1 >> 8);
leaseTime[1] = (byte)(replyOptions.RenewalTimeValue_T1 >> 16);
leaseTime[0] = (byte)(replyOptions.RenewalTimeValue_T1 >> 24);
options[DhcpOption.RenewalTimeValue_T1] = leaseTime;
}
if (replyOptions.RebindingTimeValue_T2.HasValue)
{
leaseTime[3] = (byte)(replyOptions.RebindingTimeValue_T2);
leaseTime[2] = (byte)(replyOptions.RebindingTimeValue_T2 >> 8);
leaseTime[1] = (byte)(replyOptions.RebindingTimeValue_T2 >> 16);
leaseTime[0] = (byte)(replyOptions.RebindingTimeValue_T2 >> 24);
options[DhcpOption.RebindingTimeValue_T2] = leaseTime;
}
}
}
// Other requested options
if (otherForceOptions != null)
{
foreach (var option in otherForceOptions.Keys)
{
options[option] = otherForceOptions[option];
if (option == DhcpOption.RelayInfo)
{
relayInfo = null;
}
}
}
// Option 82? Send it back!
if (relayInfo != null)
{
options[DhcpOption.RelayInfo] = relayInfo;
}
foreach (var option in options.OrderBy(x => (int)x.Key))
{
CreateOptionElement(ref resultOptions, option.Key, option.Value);
}
// Create the end option
Array.Resize(ref resultOptions, resultOptions.Length + 1);
Array.Copy(new byte[] { 255 }, 0, resultOptions, resultOptions.Length - 1, 1);
return(resultOptions);
}
/// <summary>
/// Sends DHCP reply
/// </summary>
/// <param name="msgType">Type of DHCP message to send</param>
/// <param name="ip">IP for client</param>
/// <param name="replyData">Reply options (will be sent if requested)</param>
/// <param name="otherForceOptions">Force reply options (will be sent anyway)</param>
private async void SendDHCPReply(DhcpMsgType msgType, IPAddress ip, DhcpReplyOptions replyData, Dictionary <DhcpOption, byte[]> otherForceOptions, IEnumerable <DhcpOption> forceOptions)
{
var replyBuffer = requestData;
replyBuffer.op = 2; // Reply
replyBuffer.yiaddr = ip.GetAddressBytes(); // Client's IP
if (replyData.ServerIpAddress != null)
{
replyBuffer.siaddr = replyData.ServerIpAddress.GetAddressBytes();
}
replyBuffer.options = CreateOptionStruct(msgType, replyData, otherForceOptions, forceOptions); // Options
if (!string.IsNullOrEmpty(dhcpServer.ServerName))
{
var serverNameBytes = Encoding.ASCII.GetBytes(dhcpServer.ServerName);
int len = (serverNameBytes.Length > 63) ? 63 : serverNameBytes.Length;
Array.Copy(serverNameBytes, replyBuffer.sname, len);
replyBuffer.sname[len] = 0;
}
//lock (requestSocket)
{
var DataToSend = BuildDataStructure(replyBuffer);
if (DataToSend.Length < 300)
{
var sendArray = new byte[300];
Array.Copy(DataToSend, 0, sendArray, 0, DataToSend.Length);
DataToSend = sendArray;
}
if ((replyBuffer.giaddr[0] == 0) && (replyBuffer.giaddr[1] == 0) &&
(replyBuffer.giaddr[2] == 0) && (replyBuffer.giaddr[3] == 0))
{
//requestSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, true);
//endPoint = new IPEndPoint(dhcpServer.BroadcastAddress, PORT_TO_SEND_TO_CLIENT);
//var udp = new UdpClient();
//udp.EnableBroadcast = true;
//udp.Send(DataToSend, DataToSend.Length, new IPEndPoint(dhcpServer.BroadcastAddress, 68));
//udp.Close();
var datagramsocket = new Windows.Networking.Sockets.DatagramSocket();
using (var stream = await datagramsocket.GetOutputStreamAsync(new Windows.Networking.HostName(dhcpServer.BroadcastAddress), PORT_TO_SEND_TO_CLIENT.ToString()))
{
using (var datawriter = new Windows.Storage.Streams.DataWriter(stream))
{
datawriter.WriteBytes(DataToSend);
await datawriter.StoreAsync();
}
}
}
else
{
//requestSocket .SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, false);
//endPoint = new IPEndPoint(new IPAddress(replyBuffer.giaddr), PORT_TO_SEND_TO_RELAY);
//requestSocket.SendTo(DataToSend, endPoint);
using (var stream = await requestSocket.GetOutputStreamAsync(new Windows.Networking.HostName(new IPAddress(replyBuffer.giaddr).ToString()), PORT_TO_SEND_TO_RELAY.ToString()))
{
using (var datawriter = new Windows.Storage.Streams.DataWriter(stream))
{
datawriter.WriteBytes(DataToSend);
await datawriter.StoreAsync();
}
}
}
}
}
/// <summary>
/// Sends DHCP reply
/// </summary>
/// <param name="msgType">Type of DHCP message to send</param>
/// <param name="ip">IP for client</param>
/// <param name="replyData">Reply options (will be sent if requested)</param>
/// <param name="forceOptions">Force reply options (will be sent anyway)</param>
internal void SendDHCPReply(DhcpMsgType msgType, IPAddress ip, DhcpReplyOptions replyData,
IEnumerable <DhcpOption> forceOptions)
{
SendDHCPReply(msgType, ip, replyData, null, forceOptions);
}
/// <summary>
/// Sends DHCP reply
/// </summary>
/// <param name="msgType">Type of DHCP message to send</param>
/// <param name="ip">IP for client</param>
/// <param name="replyData">Reply options (will be sent if requested)</param>
/// <param name="otherForceOptions">Force reply options (will be sent anyway)</param>
internal void SendDHCPReply(DhcpMsgType msgType, IPAddress ip, DhcpReplyOptions replyData,
Dictionary <DhcpOption, byte[]> otherForceOptions)
{
SendDHCPReply(msgType, ip, replyData, otherForceOptions, null);
}
/// <summary>
/// Sends DHCP reply
/// </summary>
/// <param name="msgType">Type of DHCP message to send</param>
/// <param name="ip">IP for client</param>
/// <param name="replyData">Reply options (will be sent if requested)</param>
internal void SendDHCPReply(DhcpMsgType msgType, IPAddress ip, DhcpReplyOptions replyData)
{
SendDHCPReply(msgType, ip, replyData, null, null);
}
