public void OnTick(uint tick)
{
switch (state)
{
case State.INIT:
if (failures <= 10)
{
offeredIP = null;
DHCPServerIP = null;
Offer = null;
RequestResponce = null;
// Create DHCP Options
Optionlist ol = new Optionlist();
ol.Add(new DHCPOption(Tag.dhcpMsgType, new byte[1] {
(byte)DHCPOption.MsgType.DHCPDISCOVER
}));
// Requesting Spesific IP
if (a.LocalIP != null)
{
ol.Add(new DHCPOption(Tag.addressRequest, a.LocalIP.ToBytes()));
}
// Asking for Spesific Params back
ol.Add(new DHCPOption(Tag.paramaterList, paramlist.ToArray()));
// create DHCP Datagram
DHCPDatagram DhcpDatagram = new DHCPDatagram(0, xid, ClientMAC: a.MyMACAddress, Broadcast: true, options: ol);
// UDP and IPv4 Headers
UDPHeader UDP = new UDPHeader(68, 67, DhcpDatagram.ToBytes());
IPv4Header IPv4 = IPv4Header.DefaultUDPWrapper(IP.Zero, IP.Broadcast, UDP.ToBytes(), 32);
state = State.SELECTING;
Client.Log("Sending Discover Packet");
// Send IPv4 Packet
a.SendPacket(IPv4.ToBytes());
T3 = 100;
}
break;
case State.SELECTING:
if (Offer != null)
{
if (Offer.yiaddr != null)
{
offeredIP = Offer.yiaddr;
DHCPServerIP = null;
foreach (DHCPOption o in Offer.options)
{
if (o.tag == Tag.dhcpServerID)
{
DHCPServerIP = new IP(o.data);
}
}
Optionlist ol = new Optionlist()
{
new DHCPOption(Tag.dhcpMsgType, new byte[1] {
(byte)DHCPOption.MsgType.DHCPREQUEST
}),
new DHCPOption(Tag.addressRequest, offeredIP.ToBytes())
};
if (DHCPServerIP != null)
{
ol.Add(new DHCPOption(Tag.dhcpServerID, DHCPServerIP.ToBytes()));
}
ol.Add(new DHCPOption(Tag.paramaterList, paramlist.ToArray()));
DHCPDatagram DhcpDatagram = new DHCPDatagram(0, xid, ClientMAC: a.MyMACAddress, options: ol);
UDPHeader UDP = new UDPHeader(68, 67, DhcpDatagram.ToBytes());
IP server = IP.Broadcast;
if (Offer.siaddr != null)
{
server = Offer.siaddr;
}
IPv4Header IPv4 = IPv4Header.DefaultUDPWrapper(IP.Zero, server, UDP.ToBytes(), 32);
a.SendPacket(IPv4.ToBytes());
Client.Log("Sending Request Packet");
state = State.REQUESTING;
}
}
else
if (T3-- <= 0)
{
failures++;
state = State.INIT;
}
break;
case State.REQUESTING:
if (RequestResponce != null)
{
foreach (DHCPOption o in RequestResponce.options)
{
if (o.tag == Tag.dhcpMsgType)
{
if (o.data[0] == (byte)DHCPOption.MsgType.DHCPNAK)
{
Offer = null;
RequestResponce = null;
state = State.INIT;
break;
}
else
if (o.data[0] == (byte)DHCPOption.MsgType.DHCPACK)
{
foreach (DHCPOption op in RequestResponce.options)
{
switch (op.tag)
{
case Tag.addressTime:
T1 = BitConverter.ToUInt32(op.data, 0);
T2 = T1 - 10;
break;
case Tag.subnetmask:
a.SubnetMask = new IP(op.data, 0);
break;
case Tag.router:
a.DefaultGateway = new IP(op.data, 0);
break;
case Tag.domainserver:
a.DNS = new IP(op.data, 0);
break;
}
}
a.LocalIP = RequestResponce.yiaddr;
state = State.BOUND;
break;
}
}
}
}
break;
case State.BOUND:
if (T2-- <= 0)
{
T1--;
Optionlist ol = new Optionlist()
{
new DHCPOption(Tag.dhcpMsgType, new byte[1] {
(byte)DHCPOption.MsgType.DHCPREQUEST
}),
new DHCPOption(Tag.addressRequest, a.LocalIP.ToBytes())
};
if (DHCPServerIP != null)
{
ol.Add(new DHCPOption(Tag.dhcpServerID, DHCPServerIP.ToBytes()));
}
ol.Add(new DHCPOption(Tag.paramaterList, paramlist.ToArray()));
DHCPDatagram DhcpDatagram = new DHCPDatagram(0, xid, ClientMAC: a.MyMACAddress, options: ol);
UDPHeader UDP = new UDPHeader(68, 67, DhcpDatagram.ToBytes());
IP server = IP.Broadcast;
if (Offer.siaddr != null)
{
server = Offer.siaddr;
}
IPv4Header IPv4 = IPv4Header.DefaultUDPWrapper(a.LocalIP, server, UDP.ToBytes(), 32);
RequestResponce = null;
a.SendPacket(IPv4.ToBytes());
state = State.RENEWING;
}
break;
case State.RENEWING:
if (RequestResponce != null)
{
foreach (DHCPOption o in RequestResponce.options)
{
if (o.tag == Tag.dhcpMsgType)
{
if (o.data[0] == (byte)DHCPOption.MsgType.DHCPNAK)
{
Offer = null;
state = State.INIT;
break;
}
else
if (o.data[0] == (byte)DHCPOption.MsgType.DHCPACK)
{
foreach (DHCPOption op in RequestResponce.options)
{
switch (op.tag)
{
case Tag.addressTime:
T1 = BitConverter.ToUInt32(op.data, 0);
T2 = T1 - 200;
break;
case Tag.subnetmask:
a.SubnetMask = new IP(op.data, 0);
break;
case Tag.router:
a.DefaultGateway = new IP(op.data, 0);
break;
case Tag.domainserver:
a.DNS = new IP(op.data, 0);
break;
}
}
a.LocalIP = RequestResponce.yiaddr;
state = State.BOUND;
break;
}
}
}
}
else
if (T1-- <= 0)
{
Optionlist ol = new Optionlist()
{
new DHCPOption(Tag.dhcpMsgType, new byte[1] {
(byte)DHCPOption.MsgType.DHCPREQUEST
}),
new DHCPOption(Tag.addressRequest, a.LocalIP.ToBytes())
};
if (DHCPServerIP != null)
{
ol.Add(new DHCPOption(Tag.dhcpServerID, DHCPServerIP.ToBytes()));
}
ol.Add(new DHCPOption(Tag.paramaterList, paramlist.ToArray()));
DHCPDatagram DhcpDatagram = new DHCPDatagram(0, xid, ClientMAC: a.MyMACAddress, options: ol);
UDPHeader UDP = new UDPHeader(68, 67, DhcpDatagram.ToBytes());
IP server = IP.Broadcast;
if (Offer.siaddr != null)
{
server = Offer.siaddr;
}
IPv4Header IPv4 = IPv4Header.DefaultUDPWrapper(a.LocalIP, server, UDP.ToBytes(), 32);
state = State.REBINDING;
T3 = 200;
a.SendPacket(IPv4.ToBytes());
}
break;
case State.REBINDING:
if (RequestResponce != null)
{
foreach (DHCPOption o in RequestResponce.options)
{
if (o.tag == Tag.dhcpMsgType)
{
if (o.data[0] == (byte)DHCPOption.MsgType.DHCPNAK)
{
Offer = null;
state = State.INIT;
break;
}
else
if (o.data[0] == (byte)DHCPOption.MsgType.DHCPACK)
{
foreach (DHCPOption op in RequestResponce.options)
{
switch (op.tag)
{
case Tag.addressTime:
T1 = BitConverter.ToUInt32(op.data, 0);
T2 = T1 - 200;
break;
case Tag.subnetmask:
a.SubnetMask = new IP(op.data, 0);
break;
case Tag.router:
a.DefaultGateway = new IP(op.data, 0);
break;
case Tag.domainserver:
a.DNS = new IP(op.data, 0);
break;
}
}
a.LocalIP = RequestResponce.yiaddr;
state = State.BOUND;
break;
}
}
}
}
else
if (T3-- <= 0)
{
state = State.INIT;
}
break;
case State.INITREBOOT:
state = State.INIT;
break;
case State.REBOOTING:
state = State.INIT;
break;
}
}
public void packet(IPv4Header ipv4, UDPHeader udp, UInt16 dest, NetworkInterface a)
{
if (dest == 67)
{
try
{
DHCPDatagram dHCP = new DHCPDatagram(udp.Datagram);
DHCPDatagram newdHCP = new DHCPDatagram(2, dHCP.xid, ClientMAC: dHCP.chaddr);
Optionlist ol = new Optionlist();
foreach (DHCPOption o in dHCP.options)
{
switch (o.tag)
{
case Tag.paramaterList:
foreach (byte b in o.data)
{
switch ((Tag)b)
{
case Tag.dhcpServerID:
ol.Add(new DHCPOption(Tag.dhcpServerID, a.LocalIP.ToBytes()));
break;
case Tag.router:
ol.Add(new DHCPOption(Tag.router, GatewayIP.ToBytes()));
break;
case Tag.subnetmask:
ol.Add(new DHCPOption(Tag.subnetmask, SubnetMask.ToBytes()));
break;
case Tag.domainserver:
ol.Add(new DHCPOption(Tag.domainserver, DNS.ToBytes()));
break;
}
}
break;
case Tag.dhcpMsgType:
switch ((DHCPOption.MsgType)o.data[0])
{
case DHCPOption.MsgType.DHCPDISCOVER:
Log("DHCPDescover recieved from " + dHCP.chaddr.ToString());
if (newdHCP == null)
{
break;
}
newdHCP.yiaddr = NewAddress(dHCP.chaddr);
Reserved.Add(newdHCP.yiaddr, new Lease(newdHCP.yiaddr, dHCP.chaddr, currentTick, 100));
ol.Add(new DHCPOption(Tag.dhcpMsgType, new byte[] { (byte)DHCPOption.MsgType.DHCPOFFER }));
Log("Offered IP " + newdHCP.yiaddr + " to " + newdHCP.chaddr);
break;
case DHCPOption.MsgType.DHCPREQUEST:
IP Request = new IP(dHCP.options.Find(match => match.tag == Tag.addressRequest).data, 0);
Log("DHCPRequest recieved from " + dHCP.chaddr.ToString());
if (isAvailable(Request, dHCP.chaddr))
{
lock (Leaseslock)
{
if (Reserved.ContainsKey(Request))
{
Reserved.Remove(Request);
}
if (Leases.ContainsKey(Request))
{
Leases.Remove(Request);
}
Lease l = new Lease(Request, dHCP.chaddr, currentTick, (uint)r.Next(40, 60));
Leases.Add(l.ciaddr, l);
ol.Add(new DHCPOption(Tag.dhcpMsgType, new byte[] { (byte)DHCPOption.MsgType.DHCPACK }));
newdHCP.yiaddr = Request;
Log("Leased IP " + l.ciaddr + " to " + l.chaddr + " for " + l.LeaseLength + " ticks");
}
}
else
{
ol.Add(new DHCPOption(Tag.dhcpMsgType, new byte[] { (byte)DHCPOption.MsgType.DHCPNAK }));
Log("denied lease of " + Request + " to " + dHCP.chaddr);
}
break;
}
break;
}
}
newdHCP.options = ol;
UDPHeader newupd = new UDPHeader(67, 68, newdHCP.ToBytes());
IPv4Header newipv4 = IPv4Header.DefaultUDPWrapper(a.LocalIP, IP.Broadcast, newupd.ToBytes(), 32);
a.SendPacket(newipv4.ToBytes());
Log("Packet Sent");
}
catch (Exception e)
{
Log(e.ToString());
}
}
}