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="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>
/// <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>
internal void SendDHCPReply(DHCPMsgType msgType, IPAddress ip, DHCPReplyOptions replyData)
{
SendDHCPReply(msgType, ip, replyData, null, null);
}
