private const int PORT_TO_SEND_TO_RELAY = 0x43; // EDITED:: valore 67 (porta del server)
/// <summary>
/// Raw DHCP packet
/// </summary>
internal DhcpRequest(byte[] data, DatagramSocket socket, Dhcp server)
{
dhcpServer = server;
BinaryReader rdr;
MemoryStream stm = new MemoryStream(data, 0, data.Length);
rdr = new BinaryReader(stm);
// Reading data
requestData.op = rdr.ReadByte();
requestData.htype = rdr.ReadByte();
requestData.hlen = rdr.ReadByte();
requestData.hops = rdr.ReadByte();
requestData.xid = rdr.ReadBytes(4);
requestData.secs = rdr.ReadBytes(2);
requestData.flags = rdr.ReadBytes(2);
requestData.ciaddr = rdr.ReadBytes(4);
requestData.yiaddr = rdr.ReadBytes(4);
requestData.siaddr = rdr.ReadBytes(4);
requestData.giaddr = rdr.ReadBytes(4);
requestData.chaddr = rdr.ReadBytes(16);
requestData.sname = rdr.ReadBytes(64);
requestData.file = rdr.ReadBytes(128);
requestData.mcookie = rdr.ReadBytes(4);
requestData.options = rdr.ReadBytes(data.Length - OPTION_OFFSET);
requestSocket = socket;
}
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();
}
