/// <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>
public void SendDHCPReply(DHCPMsgType msgType, IPAddress ip, DHCPReplyOptions replyData, Dictionary <DHCPOption, byte[]> otherForceOptions)
{
var replyBuffer = requestData;
replyBuffer.op = 2; // Reply
replyBuffer.yiaddr = ip.GetAddressBytes(); // Client's IP
replyBuffer.options = CreateOptionStruct(msgType, replyData, otherForceOptions); // 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)
{
IPEndPoint endPoint;
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(IPAddress.Broadcast, PORT_TO_SEND_TO_CLIENT);
}
else
{
requestSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, false);
endPoint = new IPEndPoint(new IPAddress(replyBuffer.giaddr), PORT_TO_SEND_TO_RELAY);
}
var DataToSend = BuildDataStructure(replyBuffer);
requestSocket.SendTo(DataToSend, endPoint);
}
}
private byte[] CreateOptionStruct(DHCPMsgType msgType, DHCPReplyOptions replyOptions)
{
byte[] resultOptions = null;
// Option82?
var relayInfo = OptionData.GetOptionData(DHCPOption.RelayInfo, _dhcpRequest.requestData);
CreateOptionElement(ref resultOptions, DHCPOption.DHCPMessageTYPE, new [] { (byte)msgType });
// Server identifier - our IP address
if (_dhcpRequest.dhcpServer.ServerIdentifier != null)
{
CreateOptionElement(ref resultOptions, DHCPOption.ServerIdentifier, _dhcpRequest.dhcpServer.ServerIdentifier.GetAddressBytes());
}
// Requested options
if (replyOptions != null)
{
foreach (var option in replyOptions.OtherOptions.Keys)
{
CreateOptionElement(ref resultOptions, option, replyOptions.OtherOptions[option]);
}
}
// Option 82? Send it back!
if (relayInfo != null)
{
CreateOptionElement(ref resultOptions, DHCPOption.RelayInfo, relayInfo);
}
// 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="replyData">Reply options (will be sent if requested)</param>
/// <param name="replyPort">Port to send on</param>
public void Send(DHCPMsgType msgType, DHCPReplyOptions replyData, int replyPort)
{
var replyBuffer = _dhcpRequest.requestData;
replyBuffer.op = 2; // Reply
replyBuffer.options = CreateOptionStruct(msgType, replyData); // Options
if (!string.IsNullOrEmpty(_dhcpRequest.dhcpServer.ServerName))
{
var serverNameBytes = Encoding.ASCII.GetBytes(_dhcpRequest.dhcpServer.ServerName);
int len = (serverNameBytes.Length > 63) ? 63 : serverNameBytes.Length;
Array.Copy(serverNameBytes, replyBuffer.sname, len);
replyBuffer.sname[len] = 0;
}
if (replyData.NextServer != null)
{
var nextServerBytes = replyData.NextServer.GetAddressBytes();
Array.Copy(nextServerBytes, replyBuffer.siaddr, 4);
}
if (replyData.BootFileName != null)
{
var bootFileNameBytes = Encoding.ASCII.GetBytes(replyData.BootFileName);
int len = (bootFileNameBytes.Length > 127) ? 127 : bootFileNameBytes.Length;
Array.Copy(bootFileNameBytes, replyBuffer.file, len);
replyBuffer.file[len] = 0;
}
lock (_dhcpRequest.requestSocket)
{
IPEndPoint endPoint;
if (msgType == DHCPMsgType.DHCPACK)
{
//Trace.WriteLine("Sending Acknowledgement to " + new IPAddress(replyBuffer.ciaddr) + ":" + replyPort);
_dhcpRequest.requestSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, false);
endPoint = new IPEndPoint(new IPAddress(replyBuffer.ciaddr), replyPort);
}
else
{
if ((replyBuffer.giaddr[0] == 0) && (replyBuffer.giaddr[1] == 0) &&
(replyBuffer.giaddr[2] == 0) && (replyBuffer.giaddr[3] == 0))
{
//Trace.WriteLine("Sending Offer To " + IPAddress.Broadcast + ":" + PORT_TO_SEND_TO_CLIENT);
_dhcpRequest.requestSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, true);
endPoint = new IPEndPoint(IPAddress.Broadcast, PORT_TO_SEND_TO_CLIENT);
}
else
{
//Trace.WriteLine("Sending Offer To " + new IPAddress(replyBuffer.giaddr) + ":" + PORT_TO_SEND_TO_RELAY);
_dhcpRequest.requestSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, false);
endPoint = new IPEndPoint(new IPAddress(replyBuffer.giaddr), PORT_TO_SEND_TO_RELAY);
}
}
var DataToSend = BuildDataStructure(replyBuffer);
_dhcpRequest.requestSocket.SendTo(DataToSend, endPoint);
}
}
/// <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 void SendDHCPReply(DHCPMsgType msgType, IPAddress ip, DHCPReplyOptions replyData, Dictionary <DHCPOption, byte[]> otherForceOptions, IEnumerable <DHCPOption> forceOptions)
{
var replyBuffer = requestData;
replyBuffer.op = 2; // Reply
if (msgType == DHCPMsgType.DHCPOFFER || msgType == DHCPMsgType.DHCPACK)
{
replyBuffer.yiaddr = ip.GetAddressBytes(); // Client's IP
if (replyData.ServerIpAddress != null)
{
replyBuffer.siaddr = replyData.ServerIpAddress.GetAddressBytes();
}
}
//IPAddress localIp = ((IPEndPoint)udp.Client.LocalEndPoint).Address;
//replyData.ServerIdentifier = localIp;
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)
lock (udp)
{
var DataToSend = BuildDataStructure(replyBuffer);
if (DataToSend.Length < 300)
{
var sendArray = new byte[300];
Array.Copy(DataToSend, 0, sendArray, 0, DataToSend.Length);
DataToSend = sendArray;
}
if (dhcpServer.SendDhcpAnswerNetworkInterface != null)
{
udp.Client.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastInterface, (int)IPAddress.HostToNetworkOrder(dhcpServer.SendDhcpAnswerNetworkInterface.GetIPProperties().GetIPv4Properties().Index));
}
IPEndPoint endPoint = null;
if ((replyBuffer.giaddr[0] == 0) && (replyBuffer.giaddr[1] == 0) &&
(replyBuffer.giaddr[2] == 0) && (replyBuffer.giaddr[3] == 0))
{
endPoint = new IPEndPoint(dhcpServer.BroadcastAddress, PORT_TO_SEND_TO_CLIENT);
udp.EnableBroadcast = true;
udp.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
}
else
{
endPoint = new IPEndPoint(new IPAddress(replyBuffer.giaddr), PORT_TO_SEND_TO_RELAY);
udp.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, false);
}
udp.Send(DataToSend, DataToSend.Length, endPoint);
}
}
static void discoverHandler(DHCPRequest dhcpRequest)
{
DHCPMsgType type = dhcpRequest.GetMsgType();
String mac = Util.bytesToMac(dhcpRequest.GetChaddr());
IPAddress ip = pool.offerIP(mac, dhcpRequest.GetRequestedIP());
DHCPReplyOptions options = defaultOptions.clone();
options.ServerIdentifier = localAddress;
dhcpRequest.SendDHCPReply(DHCPMsgType.DHCPOFFER, ip, defaultOptions);
sendNotify(DhcpNotify.NotifyType.DISCOVER, String.Format("RTDhcpServer receives DHCP discover message from {0}, offer {1}", mac, ip));
}
/// <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 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;
}
IPEndPoint endPoint;
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();
}
else
{
requestSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, false);
endPoint = new IPEndPoint(new IPAddress(replyBuffer.giaddr), PORT_TO_SEND_TO_RELAY);
requestSocket.SendTo(DataToSend, endPoint);
}
}
}
public DHCPClient(Guid guid, string mac, SocketType type, IPEndPoint endpoint)
{
this.type = type;
this.endp = endpoint;
this.wdsclient = false;
this.pollInterval = Convert.ToInt16(Settings.PollInterval);
this.retrycount = Convert.ToInt16(Settings.RetryCount);
this.actionDone = false;
this.guid = guid;
this.mac = mac;
this.id = string.Format("{0}-{1}", this.guid, this.mac);
this.adminMessage = "Client ID: {0}".F(this.id);
this.nextAction = NextActionOptionValues.Approval;
this.msgType = DHCPMsgType.Offer;
this.arch = Architecture.Intelx86PC;
this.bootfile = string.Empty;
this.undi_major = 2;
this.undi_minor = 1;
}
//mac announced itself, established IP etc....
//send the offer to the mac
public void SendDHCPMessage(DHCPMsgType msgType, cDHCPStruct ddHcpS)
{
byte[] Subn, HostID, DataToSend;
//we shall leave everything as is structure wise
//shall CHANGE the type to OFFER
//shall set the client's IP-Address
try
{
//change message type to reply
ddHcpS.dStruct.D_op = 2; //reply
//subnet
Subn = IPAddress.Parse(ddHcpS.dData.SubMask).GetAddressBytes();
//create your ip address
ddHcpS.dStruct.D_yiaddr = IPAddress.Parse(ddHcpS.dData.IPAddr).GetAddressBytes();
//Host ID
HostID = System.Text.Encoding.ASCII.GetBytes(ddHcpS.dData.ServerName);
CreateOptionStruct(ref ddHcpS, msgType);
//send the data to the unit
DataToSend = BuildDataStructure(ddHcpS.dStruct);
cUdp.SendData(DataToSend);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
finally
{
Subn = null;
//LeaseTime= null;
HostID = null;
DataToSend = null;
}
}
private void CreateOptionStruct(ref cDHCPStruct ddHcps, DHCPMsgType OptionReplyMsg)
{
byte[] PReqList, t1, LeaseTime, MyIp;
try
{
//we look for the parameter request list
PReqList = GetOptionData(DHCPOptionEnum.ParameterRequestList, ddHcps);
//erase the options array, and set the message type to ack
ddHcps.dStruct.D_options = null;
CreateOptionElement(DHCPOptionEnum.DHCPMessageTYPE, new byte[] { (byte)OptionReplyMsg }, ref ddHcps.dStruct.D_options);
//server identifier, my IP
MyIp = IPAddress.Parse(ddHcps.dData.MyIP).GetAddressBytes();
CreateOptionElement(DHCPOptionEnum.ServerIdentifier, MyIp, ref ddHcps.dStruct.D_options);
//PReqList contains the option data in a byte that is requested by the unit
foreach (byte i in PReqList)
{
t1 = null;
switch ((DHCPOptionEnum)i)
{
case DHCPOptionEnum.SubnetMask:
t1 = IPAddress.Parse(ddHcps.dData.SubMask).GetAddressBytes();
break;
case DHCPOptionEnum.Router:
t1 = IPAddress.Parse(ddHcps.dData.RouterIP).GetAddressBytes();
break;
case DHCPOptionEnum.DomainNameServer:
t1 = IPAddress.Parse(ddHcps.dData.DomainIP).GetAddressBytes();
break;
case DHCPOptionEnum.DomainName:
t1 = System.Text.Encoding.ASCII.GetBytes(ddHcps.dData.ServerName);
break;
case DHCPOptionEnum.ServerIdentifier:
t1 = IPAddress.Parse(ddHcps.dData.MyIP).GetAddressBytes();
break;
case DHCPOptionEnum.LogServer:
t1 = System.Text.Encoding.ASCII.GetBytes(ddHcps.dData.LogServerIP);
break;
case DHCPOptionEnum.NetBIOSoverTCPIPNameServer:
break;
}
if (t1 != null)
{
CreateOptionElement((DHCPOptionEnum)i, t1, ref ddHcps.dStruct.D_options);
}
}
//lease time
LeaseTime = new byte[4];
LeaseTime[3] = (byte)(ddHcps.dData.LeaseTime);
LeaseTime[2] = (byte)(ddHcps.dData.LeaseTime >> 8);
LeaseTime[1] = (byte)(ddHcps.dData.LeaseTime >> 16);
LeaseTime[0] = (byte)(ddHcps.dData.LeaseTime >> 24);
CreateOptionElement(DHCPOptionEnum.IPAddressLeaseTime, LeaseTime, ref ddHcps.dStruct.D_options);
CreateOptionElement(DHCPOptionEnum.RenewalTimeValue_T1, LeaseTime, ref ddHcps.dStruct.D_options);
CreateOptionElement(DHCPOptionEnum.RebindingTimeValue_T2, LeaseTime, ref ddHcps.dStruct.D_options);
//create the end option
Array.Resize(ref ddHcps.dStruct.D_options, ddHcps.dStruct.D_options.Length + 1);
Array.Copy(new byte[] { 255 }, 0, ddHcps.dStruct.D_options, ddHcps.dStruct.D_options.Length - 1, 1);
//send the data to the unit
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
finally
{
LeaseTime = null;
PReqList = null;
t1 = null;
}
}
private byte[] CreateOptionStruct(DHCPMsgType msgType, DHCPReplyOptions replyOptions, Dictionary<DHCPOption, byte[]> otherForceOptions)
{
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))
CreateOptionElement(ref resultOptions, DHCPOption.ServerIdentifier, replyOptions.ServerIdentifier.GetAddressBytes());
// Requested options
if ((reqList != null) && (replyOptions != null))
foreach (DHCPOption i in reqList)
{
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)
CreateOptionElement(ref resultOptions, 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);
CreateOptionElement(ref resultOptions, DHCPOption.IPAddressLeaseTime, leaseTime);
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);
CreateOptionElement(ref resultOptions, DHCPOption.RenewalTimeValue_T1, leaseTime);
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);
CreateOptionElement(ref resultOptions, DHCPOption.RebindingTimeValue_T2, leaseTime);
}
}
// Other requested options
if (otherForceOptions != null)
foreach (var option in otherForceOptions.Keys)
{
CreateOptionElement(ref resultOptions, option, otherForceOptions[option]);
if (option == DHCPOption.RelayInfo) relayInfo = null;
}
// Option 82? Send it back!
if (relayInfo != null)
CreateOptionElement(ref resultOptions, DHCPOption.RelayInfo, relayInfo);
// 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>
public void SendDHCPReply(DHCPMsgType msgType, IPAddress ip, DHCPReplyOptions replyData)
{
SendDHCPReply(msgType, ip, replyData, 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>
public 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>
public 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>
public void SendDHCPReply(DHCPMsgType msgType, IPAddress ip, DHCPReplyOptions replyData)
{
SendDHCPReply(msgType, ip, replyData, null, null);
}
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))
{
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>
public void SendDHCPReply(DHCPMsgType msgType, IPAddress ip, DHCPReplyOptions replyData, Dictionary<DHCPOption, byte[]> otherForceOptions)
{
var replyBuffer = requestData;
replyBuffer.op = 2; // Reply
replyBuffer.yiaddr = ip.GetAddressBytes(); // Client's IP
replyBuffer.options = CreateOptionStruct(msgType, replyData, otherForceOptions); // 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)
{
IPEndPoint endPoint;
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(IPAddress.Broadcast, PORT_TO_SEND_TO_CLIENT);
}
else
{
requestSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, false);
endPoint = new IPEndPoint(new IPAddress(replyBuffer.giaddr), PORT_TO_SEND_TO_RELAY);
}
var DataToSend = BuildDataStructure(replyBuffer);
requestSocket.SendTo(DataToSend, endPoint);
}
}
/// <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();
}
}
}
}
}
