public void SendPacket(Packet p, INetworkController src = null)
{
// перебор всех интерфейсов, поиск того, с которого можно отправить
INetworkController sender = null;
foreach (var i in Interfaces)
{
if (IP.CompareBySubnets(p.DestinationIP, i.IP, i.Netmask))
{
sender = i;
break;
}
}
if (sender != null && src != sender)
{
p.SourceIP = sender.IP;
Lan.SendPacket(p, sender);
}
else
{
if (defaultIface == null)
{
// пакет никуда не уходит
Lan.SendPacket(p, null);
}
else
{
if (src != defaultIface)
{
p.SourceIP = defaultIface.IP;
Lan.SendPacket(p, defaultIface);
}
}
}
}
public void SendPacket(Packet p, INetworkController src)
{
// пусть это будет хаб - посылает пакет на все порты, кроме исходного
foreach (var i in Interfaces)
if (i != src)
Lan.SendPacket(p, i);
}
private void button1_Click(object sender, EventArgs e)
{
LocalAreaNetwork lan1 = new LocalAreaNetwork();
PersonalComputer pc1 = new PersonalComputer("pc1");
pc1.AddInterface(new EthernetController("192.168.100.1", "255.255.255.0"));
PersonalComputer pc2 = new PersonalComputer("pc2");
pc2.AddInterface(new EthernetController("192.168.100.2", "255.255.255.0"));
PersonalComputer pc3 = new PersonalComputer("pc3");
pc3.AddInterface(new EthernetController("192.168.100.3", "255.255.255.0"));
Switch sw = new Switch(3, "sw");
lan1.AddDevice(pc1);
lan1.AddDevice(pc2);
lan1.AddDevice(pc3);
lan1.AddDevice(sw);
lan1.AddLink(new WiredLink(pc1.Interfaces[0] as EthernetController, sw.Interfaces[0] as EthernetController));
lan1.AddLink(new WiredLink(pc2.Interfaces[0] as EthernetController, sw.Interfaces[1] as EthernetController));
lan1.AddLink(new WiredLink(pc3.Interfaces[0] as EthernetController, sw.Interfaces[2] as EthernetController));
Packet p = new Packet("192.168.100.1", "192.168.100.3", "ping");
pc1.SendPacket(p);
}
public void SendPacket(Packet p, INetworkController iface)
{
// пакет никуда не уходит, что-нибудь сообщить...
if (iface == null)
;
// ищем интерфейс, с которым связан iface
foreach (var i in Links)
{
if (i.Point1 == iface)
i.Point2.ReceivePacket(p);
else if (i.Point2 == iface)
i.Point1.ReceivePacket(p);
}
}
public void SendPacket(Packet p)
{
Device.SendPacket(p, this);
}
public void ReceivePacket(Packet p)
{
// пакет дошел
if (p.DestinationIP == IP)
switch (p.Message)
{
case "ping":
p.Message = "pong";
p.DestinationIP = p.SourceIP;
p.SourceIP = this.IP;
p.TTL--;
this.Device.Lan.SendPacket(p, this);
break;
case "pong":
System.Windows.Forms.MessageBox.Show("PING: \n" + p.DestinationIP + " -> " + p.SourceIP);
break;
default:
System.Windows.Forms.MessageBox.Show("Неизвестный пакет");
break;
}
else
SendPacket(p);
}
