static private async Task <DHCPPacketView> GenerateLease(DHCPPacketView discovery, IPEndPoint localEndPoint, IPEndPoint remoteEndPoint)
{
DHCPPacketView result;
switch (discovery.DHCPMessageType)
{
case DHCPMessageType.DHCPDISCOVER:
result = new DHCPPacketView(DHCPMessageType.DHCPOFFER);
break;
case DHCPMessageType.DHCPREQUEST:
result = new DHCPPacketView(DHCPMessageType.DHCPACK);
break;
default:
return(null);
}
result.ClientHardwareAddress = discovery.ClientHardwareAddress;
result.TransactionId = discovery.TransactionId;
result.TimeElapsed = discovery.TimeElapsed;
result.BroadcastFlag = discovery.BroadcastFlag;
result.NextServerIP = localEndPoint.Address;
result.RelayAgentIP = discovery.RelayAgentIP;
result.Hops = discovery.Hops;
result.RenewalTimeValue = TimeSpan.FromHours(12);
result.RebindingTimeValue = TimeSpan.FromHours(21);
result.IPAddressLeaseTime = TimeSpan.FromHours(24);
result.DHCPServerIdentifier = localEndPoint.Address;
result.YourIP = IPAddress.Parse("172.20.0.99");
result.SubnetMask = IPAddress.Parse("255.255.255.0");
result.Routers = new List <IPAddress> {
IPAddress.Parse("172.20.0.1")
};
result.Hostname = "bob";
result.DomainName = "minions.com";
result.DomainNameServers = new List <IPAddress> {
IPAddress.Parse("10.100.11.81")
};
return(result);
}
public bool ReleaseLease(DHCPPacketView packet, IPEndPoint localEndPoint, IPEndPoint remoteEndPoint)
{
var pool = GetPoolByIP(packet.ClientIP);
if (pool == null)
{
System.Diagnostics.Debug.WriteLine("Failed to find DHCP pool for lease release -> " + packet.ClientIP.ToString());
return(false);
}
var addressPool = AddressPools.Where(x => x.Pool == pool).FirstOrDefault();
if (addressPool == null)
{
System.Diagnostics.Debug.WriteLine("Failed to to find DHCP IP address pool for lease release -> " + packet.ClientIP.ToString());
return(false);
}
addressPool.SetAvailable(packet.ClientIP);
System.Diagnostics.Debug.WriteLine("Returned address " + packet.ClientIP.ToString() + " to the address pool");
var count = Leases
.RemoveAll(x =>
x.ClientId.Equals(packet.ClientId)
);
if (count == 0)
{
System.Diagnostics.Debug.WriteLine("DHCPPools did not have a lease to be released for client id " + packet.ClientId.ToString());
return(false);
}
System.Diagnostics.Debug.WriteLine("DHCPPools released IP address " + packet.ClientIP.ToString() + " for client id " + packet.ClientId.ToString());
return(true);
}
