static void Request(DHCPRequest dhcpRequest, IPAddress targetIp, string interfaceIp)
{
try
{
var type = dhcpRequest.GetMsgType();
var replyOptions = new DHCPReplyOptions();
replyOptions.SubnetMask = IPAddress.Parse("255.255.255.0");
replyOptions.ServerIdentifier = IPAddress.Parse(interfaceIp);
if (type == DHCPMsgType.DHCPDISCOVER)
{
Console.WriteLine($"Received discovery, sending offer!");
dhcpRequest.SendDHCPReply(DHCPMsgType.DHCPOFFER, targetIp, replyOptions);
}
else if (type == DHCPMsgType.DHCPREQUEST)
{
Console.WriteLine($"Received request, sending ack!");
dhcpRequest.SendDHCPReply(DHCPMsgType.DHCPACK, targetIp, replyOptions);
}
else
{
Console.WriteLine($"Received unknown DHCP type {type}");
}
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
static void requestHandler(DHCPRequest dhcpRequest)
{
String mac = Util.bytesToMac(dhcpRequest.GetChaddr());
IPAddress si = new IPAddress(dhcpRequest.GetOptionData(DHCPOption.ServerIdentifier));
if (si != null && si.Equals(localAddress)) //client select this server
{
IPAddress requestIp = new IPAddress(dhcpRequest.GetOptionData(DHCPOption.RequestedIPAddress));
IPAddress ip = pool.ackIP(mac);
if (ip != null)
{
pool.storeDb();
dhcpRequest.SendDHCPReply(DHCPMsgType.DHCPACK, ip, defaultOptions);
sendNotify(DhcpNotify.NotifyType.REQUEST, String.Format("RTDhcpServer receives DHCP request message from {0}, ack {1}", mac, ip));
}
/*
* IPAddress ip = pool.getIP(mac);
* if (requestIp!=null && ip.Equals(requestIp))
* {
* pool.storeDb();
* dhcpRequest.SendDHCPReply(DHCPMsgType.DHCPACK, ip, options);
* sendNotify(DhcpNotify.NotifyType.REQUEST, String.Format("RTDhcpServer receives DHCP request message from {0}, ack {1}", mac, ip));
* } else
* {
* dhcpRequest.SendDHCPReply(DHCPMsgType.DHCPNAK, requestIp, options);
* pool.release(mac);
* sendNotify(DhcpNotify.NotifyType.REQUEST, String.Format("RTDhcpServer receives DHCP request message from {0}, nack {1}", mac, requestIp));
* }
*/
}
else
{
IpPoolItem item = pool.getPoolItem(mac);
if (item != null && item.status == IpPoolItem.Status.ACKED) //reuse previous allocated address
{
IPAddress ip = item.ip;
pool.storeDb();
dhcpRequest.SendDHCPReply(DHCPMsgType.DHCPACK, ip, defaultOptions);
sendNotify(DhcpNotify.NotifyType.REQUEST, String.Format("RTDhcpServer receives DHCP request(reuse) message from {0}, ack {1}", mac, ip));
}
else //not selected by client
{
pool.release(mac);
sendNotify(DhcpNotify.NotifyType.REQUEST, String.Format("RTDhcpServer receives DHCP request message from {0}, not selected by this client", mac));
}
}
}
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));
}
static void Request(DHCPRequest dhcpRequest)
{
try
{
var type = dhcpRequest.GetMsgType();
var mac = ByteArrayToString(dhcpRequest.GetChaddr());
// IP for client
IPAddress ip;
if (!leases.TryGetValue(mac, out ip))
{
ip = new IPAddress(new byte[] { 192, 168, 1, nextIP++ });
leases[mac] = ip;
}
Console.WriteLine(type.ToString() + " request from " + mac + ", it will be " + ip.ToString());
var options = dhcpRequest.GetAllOptions();
Console.Write("Options:");
foreach (DHCPOption option in options.Keys)
{
Console.WriteLine(option.ToString() + ": " + ByteArrayToString(options[option]));
}
// Lets show some request info
var requestedOptions = dhcpRequest.GetRequestedOptionsList();
if (requestedOptions != null)
{
Console.Write("Requested options:");
foreach (DHCPOption option in requestedOptions)
{
Console.Write(" " + option.ToString());
}
Console.WriteLine();
}
// Option 82 info
var relayInfoN = dhcpRequest.GetRelayInfo();
if (relayInfoN != null)
{
var relayInfo = (RelayInfo)relayInfoN;
if (relayInfo.AgentCircuitID != null)
{
Console.WriteLine("Relay agent circuit ID: " + ByteArrayToString(relayInfo.AgentCircuitID));
}
if (relayInfo.AgentRemoteID != null)
{
Console.WriteLine("Relay agent remote ID: " + ByteArrayToString(relayInfo.AgentRemoteID));
}
}
Console.WriteLine();
var replyOptions = new DHCPReplyOptions();
// Options should be filled with valid data. Only requested options will be sent.
replyOptions.SubnetMask = IPAddress.Parse("255.255.255.0");
replyOptions.DomainName = "SharpDHCPServer";
replyOptions.ServerIdentifier = IPAddress.Parse("10.0.0.1");
replyOptions.RouterIP = IPAddress.Parse("10.0.0.1");
replyOptions.DomainNameServers = new IPAddress[]
{ IPAddress.Parse("192.168.100.2"), IPAddress.Parse("192.168.100.3") };
// Some static routes
replyOptions.StaticRoutes = new NetworkRoute[]
{
new NetworkRoute(IPAddress.Parse("10.0.0.0"), IPAddress.Parse("255.0.0.0"),
IPAddress.Parse("10.0.0.1")),
new NetworkRoute(IPAddress.Parse("192.168.0.0"), IPAddress.Parse("255.255.0.0"),
IPAddress.Parse("10.0.0.1")),
new NetworkRoute(IPAddress.Parse("172.16.0.0"), IPAddress.Parse("255.240.0.0"),
IPAddress.Parse("10.0.0.1")),
new NetworkRoute(IPAddress.Parse("80.252.130.248"), IPAddress.Parse("255.255.255.248"),
IPAddress.Parse("10.0.0.1")),
new NetworkRoute(IPAddress.Parse("80.252.128.88"), IPAddress.Parse("255.255.255.248"),
IPAddress.Parse("10.0.0.1")),
};
// Lets send reply to client!
if (type == DHCPMsgType.DHCPDISCOVER)
{
dhcpRequest.SendDHCPReply(DHCPMsgType.DHCPOFFER, ip, replyOptions);
}
if (type == DHCPMsgType.DHCPREQUEST)
{
dhcpRequest.SendDHCPReply(DHCPMsgType.DHCPACK, ip, replyOptions);
}
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}