private static byte[] BuildDataStructure(DHCPPacket packet)
{
byte[] mArray;
try
{
mArray = new byte[0];
AddOptionElement(new byte[] { packet.op }, ref mArray);
AddOptionElement(new byte[] { packet.htype }, ref mArray);
AddOptionElement(new byte[] { packet.hlen }, ref mArray);
AddOptionElement(new byte[] { packet.hops }, ref mArray);
AddOptionElement(packet.xid, ref mArray);
AddOptionElement(packet.secs, ref mArray);
AddOptionElement(packet.flags, ref mArray);
AddOptionElement(packet.ciaddr, ref mArray);
AddOptionElement(packet.yiaddr, ref mArray);
AddOptionElement(packet.siaddr, ref mArray);
AddOptionElement(packet.giaddr, ref mArray);
AddOptionElement(packet.chaddr, ref mArray);
AddOptionElement(packet.sname, ref mArray);
AddOptionElement(packet.file, ref mArray);
AddOptionElement(packet.mcookie, ref mArray);
AddOptionElement(packet.options, ref mArray);
return(mArray);
}
finally
{
mArray = null;
}
}
void DisplayPacket(DHCPPacket packet) // hien thi goi tin vua nhan ra man hinh
{
// Hien thi goi tin dhcp vua nhan duoc len man hinh
//rtb_DHCPMessage.Text += packet.ToText() + "\r\n";
List <byte[]> Option = packet.optionsplit();
string DHCPType = "";
for (int i = 0; i < Option.Count(); i++)
{
if (Option[i][0] == 53)
{
if (Option[i][2] == 1)
{
DHCPType = "DHCP Discover";
}
if (Option[i][2] == 2)
{
DHCPType = "DHCP Offer";
}
if (Option[i][2] == 3)
{
DHCPType = "DHCP Request";
}
if (Option[i][2] == 4)
{
DHCPType = "DHCP Decline";
}
if (Option[i][2] == 5)
{
DHCPType = "DHCP ACK";
}
if (Option[i][2] == 6)
{
DHCPType = "DHCP NACK";
}
if (Option[i][2] == 7)
{
DHCPType = "DHCP Release";
}
if (Option[i][2] == 8)
{
DHCPType = "DHCP Inform";
}
}
}
// Display dhcp messeage
//rtbMess.Text += packet.ToText() + "\r\n"; // d.ToText() la ham tra ve mot string tu DHCPPacket
ListViewItem type = new ListViewItem(DHCPType);
lv_Message.Items.Add(type);
ListViewItem.ListViewSubItem time = new ListViewItem.ListViewSubItem(type, DateTime.Now.ToString());
type.SubItems.Add(time);
}
internal static void IPv4Handler(byte[] packetData)
{
IPPacket ip_packet = new IPPacket(packetData);
Kernel.debugger.Send("[Received] " + ip_packet.ToString());
if (ip_packet.SourceIP == null)
{
Kernel.debugger.Send("SourceIP null in IPv4Handler!");
}
ARPCache.Update(ip_packet.SourceIP, ip_packet.SourceMAC);
if ((NetworkStack.AddressMap.ContainsKey(ip_packet.DestinationIP.Hash) == true) ||
(ip_packet.DestinationIP.address[3] == 255))
{
switch (ip_packet.Protocol)
{
case 1:
ICMPPacket.ICMPHandler(packetData);
break;
/*case 6:
* TCPPacket.TCPHandler(packetData);
* break;*/
case 17:
UDPPacket.UDPHandler(packetData);
break;
}
}
else if (NetworkStack.MACMap.ContainsKey(ip_packet.DestinationMAC.Hash))
{
DHCPPacket.DHCPHandler(packetData);
}
}
/// <summary>
/// IPv4 handler.
/// </summary>
/// <param name="packetData">Packet data.</param>
/// <exception cref="sys.ArgumentOutOfRangeException">Thrown on fatal error (contact support).</exception>
/// <exception cref="sys.IO.IOException">Thrown on IO error.</exception>
/// <exception cref="sys.ArgumentException">Thrown on fatal error (contact support).</exception>
/// <exception cref="sys.OverflowException">Thrown if packetData array length is greater than Int32.MaxValue.</exception>
internal static void IPv4Handler(byte[] packetData)
{
var ip_packet = new IPPacket(packetData);
if (ip_packet.SourceIP == null)
{
Global.mDebugger.Send("SourceIP null in IPv4Handler!");
}
ARPCache.Update(ip_packet.SourceIP, ip_packet.SourceMAC);
if ((NetworkStack.AddressMap.ContainsKey(ip_packet.DestinationIP.Hash) == true) ||
(ip_packet.DestinationIP.address[3] == 255))
{
switch (ip_packet.Protocol)
{
case 1:
ICMPPacket.ICMPHandler(packetData);
break;
case 6:
TCPPacket.TCPHandler(packetData);
break;
case 17:
UDPPacket.UDPHandler(packetData);
break;
}
}
else if (NetworkStack.MACMap.ContainsKey(ip_packet.DestinationMAC.Hash))
{
DHCPPacket.DHCPHandler(packetData);
}
}
void SendPacket(DHCPPacket d) // send
{
IPAddress ipadd = IPAddress.Parse("255.255.255.255");
IPEndPoint ipend = new IPEndPoint(ipadd, 6700);
byte[] send = d.DHCPPacketToBytes();
udpclient.Send(send, send.Length, ipend);
}
void Send_DHCPRequest(DHCPPacket packet, byte[] dhcpserver, int type)
{
/*
* type = 1: selecting
* type = 2: renew, bound, rebind
* type = 3: reboot
*/
// send dhcp request
DHCPPacket n_packet = new DHCPPacket();
n_packet.Init();
n_packet.op = 1;
n_packet.htype = 1;
n_packet.hlen = 6;
n_packet.hops = 0;
for (int i = 0; i < packet.xid.Length; i++)
{
n_packet.xid[i] = packet.xid[i];
}
xid.Add(ByteArrayToString(packet.xid));
if (type == 2)
{
n_packet.ciaddr = ip.GetAddressBytes();
}
for (int i = 0; i < MacAddr.Length; i++)
{
n_packet.chaddr[i] = MacAddr[i];
}
option op_field = new option();
op_field.add(new byte[] { 99, 139, 83, 99 }); // add dhcp magic option
op_field.add(new byte[] { 53, 1, 3 }); // add messeage type dhcp request
if (type == 1 || type == 3)
{
op_field.add(new byte[] { 50, 4 }); // add request ip address
op_field.add(packet.yiaddr); // ip address
}
if (type == 1)
{
op_field.add(new byte[] { 54, 4 }); // add dhcp server identify
op_field.add(dhcpserver); // add dhcp server identify
}
op_field.add(new byte[] { 55, 3, 1, 3, 6 }); // add parament request list
op_field.add(new byte[] { 255 }); // add end
n_packet.options = new byte[op_field.size];
for (int i = 0; i < op_field.size; i++)
{
n_packet.options[i] = op_field.data[i];
}
//
SendPacket(n_packet);
}
void SendPacket(DHCPPacket packet) // Nhan mot goi DHCP packet chuyen thanh dang byte va gui di
{
IPAddress ipadd = IPAddress.Parse("255.255.255.255");
IPEndPoint ipend = new IPEndPoint(ipadd, 6800);
byte[] send = packet.DHCPPacketToBytes();
udpclient.Send(send, send.Length, ipend);
//MessageBox.Show(ByteArrayToString(send));
}
public Client()
{
InitializeComponent();
ip = IPAddress.Parse("0.0.0.0"); // Gan cac thong so mac dinh luc moi khoi dong
defaultgateway = IPAddress.Parse("0.0.0.0");
dns = IPAddress.Parse("0.0.0.0");
subnetmask = IPAddress.Parse("255.255.255.255");
var macAddr =
(
from nic in NetworkInterface.GetAllNetworkInterfaces()
where nic.OperationalStatus == OperationalStatus.Up
select nic.GetPhysicalAddress().ToString()
).FirstOrDefault(); // Lay dia chi mac
try
{
MacAddr = StringToByteArray(macAddr);
}
catch (Exception)
{
MessageBox.Show("Không tìm thấy card mạng");
MacAddr = new byte[] { 0, 0, 0, 0, 0, 0 };
} // Gan dia chi mac vao mang MacAddr
CheckForIllegalCrossThreadCalls = false;
udpclient = new UdpClient(6700); // Mo port
//Thread dung de lang nghe
Listening_thread = new Thread(new ThreadStart(Listening));
Listening_thread.IsBackground = true;
Listening_thread.Start();
//Thread dung de hien thi parameter cua client
Display_Para_thread = new Thread(new ThreadStart(Display_Parameter));
Display_Para_thread.IsBackground = true;
Display_Para_thread.Start();
//Thread dung de tu dong gia han ip khi het thoi gian
time = 0;
AutoExtend_thread = new Thread(new ThreadStart(Auto_Extend));
AutoExtend_thread.IsBackground = true;
AutoExtend_thread.Start();
haveip = false; // Chua co ip
autoextend = false;
DHCPServer_IP = new byte[] { 0, 0, 0, 0 }; // Dia chi ip cua server dhcp
offer_saved = new DHCPPacket();
ListPacket = new List <DHCPPacket>();
xid = new HashSet <string>();
}
void Send_DHCPAck(DHCPPacket packet, IPAddress IP) // take dhcp discover and allocated ip and send offer packet
{
// send dhcp offer
DHCPPacket n_packet = new DHCPPacket();
n_packet.Init();
n_packet.op = 2;
n_packet.htype = 1;
n_packet.hlen = 6;
n_packet.hops = 0;
for (int i = 0; i < packet.xid.Length; i++)
{
n_packet.xid[i] = packet.xid[i];
}
n_packet.yiaddr = IP.GetAddressBytes();
for (int i = 0; i < packet.flags.Length; i++)
{
n_packet.flags[i] = packet.flags[i];
}
for (int i = 0; i < packet.giaddr.Length; i++)
{
n_packet.giaddr[i] = packet.giaddr[i];
}
for (int i = 0; i < packet.chaddr.Length; i++)
{
n_packet.chaddr[i] = packet.chaddr[i];
}
option op_field = new option();
op_field.add(new byte[] { 99, 139, 83, 99 }); // add dhcp magic option
op_field.add(new byte[] { 53, 1, 5 }); // add messeage type dhcp ack
op_field.add(new byte[] { 54, 4 }); // add dhcp server identify
op_field.add(network_config.dhcpserver.GetAddressBytes());
op_field.add(new byte[] { 51, 4, (byte)(network_config.leasetime), (byte)(network_config.leasetime >> 8), (byte)(network_config.leasetime >> 16), (byte)(network_config.leasetime >> 24) }); // add ip lease time (120 s)
op_field.add(new byte[] { 1, 4 }); // add subnetmask
op_field.add(network_config.subnetmask.GetAddressBytes());
op_field.add(new byte[] { 3, 4 }); // add defualt gateway
op_field.add(network_config.defaultgateway.GetAddressBytes());
op_field.add(new byte[] { 6, 4 }); // add dns server
op_field.add(network_config.dns.GetAddressBytes());
op_field.add(new byte[] { 255 }); // add end
n_packet.options = new byte[op_field.size];
for (int i = 0; i < op_field.size; i++)
{
n_packet.options[i] = op_field.data[i];
}
//
SendPacket(n_packet);
}
HashSet <string> xid; // Cac xid dang giao tiep
void Listening()
{
while (true)
{
IPEndPoint IpEnd = new IPEndPoint(IPAddress.Any, 0);
Byte[] recvBytes = udpclient.Receive(ref IpEnd);
DHCPPacket packet = new DHCPPacket();
packet.BytesToDHCPPacket(recvBytes);
ListPacket.Add(packet);
DisplayPacket(packet);
HandlePacket(packet);
}
}
void Listening() // Lang nghe goi dhcp
{
while (true)
{
IPEndPoint IpEnd = new IPEndPoint(IPAddress.Any, 0);
Byte[] recvBytes = udpclient.Receive(ref IpEnd);
DHCPPacket packet = new DHCPPacket();
packet.BytesToDHCPPacket(recvBytes); // chuyen goi tin tu dang byte sang dang DHCPPacket
ListPacket.Add(packet);
Display_Message(packet); // Hien thi goi len mang hinh
HandlePacket(packet); // xu li goi vua nhan
}
}
void Send_DHCPRelease()
{
// send dhcp release
DHCPPacket packet = new DHCPPacket();
packet.Init();
packet.op = 1;
packet.htype = 1;
packet.hlen = 6;
packet.hops = 0;
Random _random = new Random();
packet.xid[0] = (byte)_random.Next(0, 255);
packet.xid[1] = (byte)_random.Next(0, 255);
packet.xid[2] = (byte)_random.Next(0, 255);
packet.xid[3] = (byte)_random.Next(0, 255);
packet.ciaddr = ip.GetAddressBytes();
for (int i = 0; i < MacAddr.Length; i++)
{
packet.chaddr[i] = MacAddr[i];
}
option op_field = new option();
op_field.add(new byte[] { 99, 139, 83, 99 }); // add dhcp magic option
op_field.add(new byte[] { 53, 1, 7 }); // add messeage type dhcp request
op_field.add(new byte[] { 54, 4 }); // add dhcp server identify
op_field.add(DHCPServer_IP);
op_field.add(new byte[] { 255 });
packet.options = new byte[op_field.size];
for (int i = 0; i < op_field.size; i++)
{
packet.options[i] = op_field.data[i];
}
//
SendPacket(packet);
haveip = false;
ip = IPAddress.Parse("0.0.0.0");
defaultgateway = IPAddress.Parse("0.0.0.0");
subnetmask = IPAddress.Parse("255.255.255.255");
dns = IPAddress.Parse("0.0.0.0");
time = 0;
DHCPServer_IP = new byte[] { 0, 0, 0, 0 };
}
void Send_DHCPNak(DHCPPacket packet) // take dhcp discover and allocated ip and send offer packet
{
// send dhcp NACK
DHCPPacket n_packet = new DHCPPacket();
n_packet.Init();
n_packet.op = 2;
n_packet.htype = 1;
n_packet.hlen = 6;
n_packet.hops = 0;
for (int i = 0; i < packet.xid.Length; i++)
{
n_packet.xid[i] = packet.xid[i];
}
for (int i = 0; i < packet.flags.Length; i++)
{
n_packet.flags[i] = packet.flags[i];
}
for (int i = 0; i < packet.giaddr.Length; i++)
{
n_packet.giaddr[i] = packet.giaddr[i];
}
for (int i = 0; i < packet.chaddr.Length; i++)
{
n_packet.chaddr[i] = packet.chaddr[i];
}
option op_field = new option();
op_field.add(new byte[] { 99, 139, 83, 99 }); // add dhcp magic option
op_field.add(new byte[] { 53, 1, 6 }); // add messeage type dhcp nack
op_field.add(new byte[] { 54, 4 }); // add dhcp server identify
op_field.add(network_config.dhcpserver.GetAddressBytes());
op_field.add(new byte[] { 255 }); // add end
n_packet.options = new byte[op_field.size];
for (int i = 0; i < op_field.size; i++)
{
n_packet.options[i] = op_field.data[i];
}
//
SendPacket(n_packet);
}
} // Chuyen tu byte array sang string
void Send_DHCPDiscover()
{
// send dhcp discover
DHCPPacket packet = new DHCPPacket();
packet.Init();
packet.op = 1;
packet.htype = 1;
packet.hlen = 6;
packet.hops = 0;
Random _random = new Random();
packet.xid[0] = (byte)_random.Next(0, 255);
packet.xid[1] = (byte)_random.Next(0, 255);
packet.xid[2] = (byte)_random.Next(0, 255);
packet.xid[3] = (byte)_random.Next(0, 255);
xid.Add(ByteArrayToString(packet.xid));
for (int i = 0; i < MacAddr.Length; i++)
{
packet.chaddr[i] = MacAddr[i];
}
option op_field = new option();
op_field.add(new byte[] { 99, 139, 83, 99 }); // add dhcp magic option
op_field.add(new byte[] { 53, 1, 1 }); // add messeage type dhcp discover
op_field.add(new byte[] { 55, 3, 1, 3, 6 }); // add parament request list
op_field.add(new byte[] { 255 }); // add end
packet.options = new byte[op_field.size];
for (int i = 0; i < op_field.size; i++)
{
packet.options[i] = op_field.data[i];
}
//
SendPacket(packet);
}
protected override void Run()
{
/**
* Packet creation and parsing tests
**/
/** Ethernet Packet Parsing Test **/
byte[] ethernetPacketData = new byte[]
{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x0C, 0x29, 0xD5, 0xDB, 0x9D, 0x08, 0x00
};
EthernetPacket ethernetPacket = new EthernetPacket(ethernetPacketData);
Equals(ethernetPacketData, ethernetPacket.RawData);
/** IP Packet Parsing Test **/
byte[] ipPacketData = new byte[]
{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x0C, 0x29, 0xD5, 0xDB, 0x9D, 0x08, 0x00, 0x45, 0x00, 0x01, 0x16, 0x00, 0x00, 0x00, 0x00, 0x80, 0x11, 0x39,
0xD8, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF
};
IPPacket ipPacket = new IPPacket(ipPacketData);
Equals(ipPacketData, ipPacket.RawData);
/** UDP Packet Parsing Test **/
byte[] udpPacketData = new byte[]
{
0x98, 0xFA, 0x9B, 0xD4, 0xEB, 0x29, 0xD8, 0xCE, 0x3A, 0x89, 0x3E, 0xD9, 0x08, 0x00, 0x45, 0x00, 0x00, 0x22, 0x0C, 0x74, 0x40, 0x00, 0x40, 0x11, 0xAA,
0xBE, 0xC0, 0xA8, 0x01, 0x02, 0xC0, 0xA8, 0x01, 0x46, 0x10, 0x92, 0x10, 0x92, 0x00, 0x0E, 0x37, 0x22, 0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x21
};
UDPPacket udpPacket = new UDPPacket(udpPacketData);
Equals(udpPacketData, udpPacket.RawData);
/** DNS Packet Parsing Test **/
byte[] dnsPacketData = new byte[]
{
0xB8, 0xD9, 0x4D, 0xC1, 0xA5, 0xFC, 0x98, 0xFA, 0x9B, 0xD4, 0xEB, 0x29, 0x08, 0x00, 0x45, 0x00, 0x00, 0x38, 0xC3, 0x1C, 0x00, 0x00, 0x80, 0x11, 0x00,
0x00, 0xC0, 0xA8, 0x01, 0x46, 0xC0, 0xA8, 0x01, 0xFE, 0xF0, 0x66, 0x00, 0x35, 0x00, 0x24, 0x84, 0xCA, 0xD6, 0x80, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x06, 0x67, 0x69, 0x74, 0x74, 0x65, 0x72, 0x03, 0x63, 0x6F, 0x6D, 0x00, 0x00, 0x01, 0x00, 0x01
};
DNSPacket dnsPacket = new DNSPacket(dnsPacketData);
Equals(dnsPacketData, dnsPacket.RawData);
/** DHCP Packet Parsing Test **/
byte[] dhcpPacketData = new byte[]
{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xB8, 0xD9, 0x4D, 0xC1, 0xA5, 0xFC, 0x08, 0x00, 0x45, 0xC0, 0x01, 0x59, 0x46, 0x3F, 0x00, 0x00, 0x40, 0x11, 0x6F,
0xEF, 0xC0, 0xA8, 0x01, 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x43, 0x00, 0x44, 0x01, 0x45, 0xD3, 0xC8, 0x02, 0x01, 0x06, 0x00, 0x84, 0xA9, 0x5A, 0x66,
0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0xC0, 0xA8, 0x01, 0x47, 0xC0, 0xA8, 0x01, 0xFE, 0x00, 0x00, 0x00, 0x00, 0x34, 0xE1, 0x2D, 0xA3, 0x06,
0x29, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x63, 0x82, 0x53, 0x63, 0x35, 0x01, 0x05, 0x36, 0x04, 0xC0, 0xA8, 0x01, 0xFE, 0x33, 0x04, 0x00, 0x01, 0x51, 0x80, 0x3A, 0x04, 0x00,
0x00, 0xA8, 0xC0, 0x3B, 0x04, 0x00, 0x01, 0x27, 0x50, 0x1C, 0x04, 0xC0, 0xA8, 0x01, 0xFF, 0x51, 0x12, 0x03, 0xFF, 0xFF, 0x44, 0x45, 0x53, 0x4B, 0x54,
0x4F, 0x50, 0x2D, 0x49, 0x51, 0x48, 0x4A, 0x33, 0x31, 0x43, 0x06, 0x04, 0xC0, 0xA8, 0x01, 0xFE, 0x0F, 0x03, 0x6C, 0x61, 0x6E, 0x03, 0x04, 0xC0, 0xA8,
0x01, 0xFE, 0x01, 0x04, 0xFF, 0xFF, 0xFF, 0x00, 0xFF
};
DHCPPacket dhcpPacket = new DHCPPacket(dhcpPacketData);
Equals(dhcpPacketData, dhcpPacket.RawData);
/** TCP Packet Parsing Test **/
byte[] tcpPacketData = new byte[]
{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x08, 0x00, 0x45, 0x00, 0x00, 0x3C, 0x64, 0x92, 0x40, 0x00, 0x40, 0x06, 0x51,
0xA2, 0xC0, 0xA8, 0x01, 0xD3, 0xC0, 0xA8, 0x01, 0x64, 0xA8, 0xAB, 0x10, 0x92, 0x67, 0x7C, 0xCE, 0x18, 0x00, 0x00, 0x00, 0x00, 0xA0, 0x02, 0x72, 0x10,
0x5F, 0xF0, 0x00, 0x00, 0x02, 0x04, 0x05, 0xB4, 0x04, 0x02, 0x08, 0x0A, 0x58, 0x1A, 0xAA, 0x8A, 0x00, 0x00, 0x00, 0x00, 0x01, 0x03, 0x03, 0x07
};
TCPPacket tcpPacket = new TCPPacket(tcpPacketData);
Equals(tcpPacket.SourcePort, 43179);
Equals(tcpPacket.DestinationPort, 4242);
Equals(tcpPacket.SequenceNumber, 0x677CCE18);
Equals(tcpPacket.AckNumber, 0);
Equals(tcpPacket.TCPFlags, Flags.SYN);
Equals(tcpPacket.WindowSize, 29200);
Equals(tcpPacket.Checksum, 0x5FF0);
Equals(tcpPacket.UrgentPointer, 0);
/** ARP Packet Parsing Test **/
byte[] arpPacketData = new byte[]
{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xB8, 0xD9, 0x4D, 0xC1, 0xA5, 0xFC, 0x08, 0x06, 0x00, 0x01, 0x08, 0x00, 0x06, 0x04, 0x00, 0x01, 0xB8, 0xD9, 0x4D,
0xC1, 0xA5, 0xFC, 0xC0, 0xA8, 0x01, 0xFE, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xC0, 0xA8, 0x01, 0x46, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
ARPPacket arpPacket = new ARPPacket(arpPacketData);
Equals(arpPacketData, arpPacket.RawData);
TestController.Completed();
/**
* Clients tests
**/
var dhcpCLient = new DHCPClient();
dhcpCLient.Close();
var dnsClient = new DnsClient();
dnsClient.Close();
var udpClient = new UdpClient();
udpClient.Close();
var tcpClient = new TcpClient(4242);
tcpClient.Close();
var icmpClient = new ICMPClient();
icmpClient.Close();
}
private static byte[] BuildDataStructure(DHCPPacket packet)
{
byte[] mArray;
try
{
mArray = new byte[0];
AddOptionElement(new byte[] { packet.op }, ref mArray);
AddOptionElement(new byte[] { packet.htype }, ref mArray);
AddOptionElement(new byte[] { packet.hlen }, ref mArray);
AddOptionElement(new byte[] { packet.hops }, ref mArray);
AddOptionElement(packet.xid, ref mArray);
AddOptionElement(packet.secs, ref mArray);
AddOptionElement(packet.flags, ref mArray);
AddOptionElement(packet.ciaddr, ref mArray);
AddOptionElement(packet.yiaddr, ref mArray);
AddOptionElement(packet.siaddr, ref mArray);
AddOptionElement(packet.giaddr, ref mArray);
AddOptionElement(packet.chaddr, ref mArray);
AddOptionElement(packet.sname, ref mArray);
AddOptionElement(packet.file, ref mArray);
AddOptionElement(packet.mcookie, ref mArray);
AddOptionElement(packet.options, ref mArray);
return mArray;
}
finally
{
mArray = null;
}
}
void HandlePacket(DHCPPacket packet)
{
// Phan biet cac goi tin request co phai selecting hay khong
bool flag1 = false;
// Xu li goi tin dhcp
List <byte[]> Option = packet.optionsplit();
for (int i = 0; i < Option.Count(); i++) // dhcp server identify khi goi request_new hoac release
{
if (Option[i][0] == 54)
{
if (!network_config.dhcpserver.Equals(new IPAddress(new byte[] { Option[i][2], Option[i][3], Option[i][4], Option[i][5] })))
{
return;
}
flag1 = true; // Neu la goi tin request thi se o trang thai selecting
break;
}
}
for (int i = 0; i < Option.Count(); i++)
{
if (Option[i][0] == 53)
{
if (Option[i][2] == 1) // xac dinh dhcp discover
{
xid.Add(ByteArrayToString(packet.xid));
byte[] b_MacAddress = new byte[packet.hlen];
for (int j = 0; j < packet.hlen; j++)
{
b_MacAddress[j] = packet.chaddr[j];
}
string s_MacAddress = ByteArrayToString(b_MacAddress);
for (int z = 0; z < table.Count(); z++)
{
if (s_MacAddress == table[z].macaddress)
{
Send_DHCPOffer(packet, IPAddress.Parse(table[z].ip));
return;
}
}
IPAddress IP = allocate();
if (IP.Equals(IPAddress.Parse("0.0.0.0"))) // if out of IP
{
return;
}
Send_DHCPOffer(packet, IP);
}
else if (Option[i][2] == 3) // Xac dinh dhcp request
{
byte[] p = new byte[6];
if (!xid.Contains(ByteArrayToString(packet.xid))) // neu xid khong thuoc cac xid dang giap tiep
{
return;
}
IPAddress IP;
IP = new IPAddress(packet.ciaddr); // request o dang rebound, ip -> ciaddr
if (packet.ciaddr.SequenceEqual(new byte[] { 0, 0, 0, 0 })) // chua co ip -> dhcp dang o dang new
{
for (int j = 0; j < Option.Count(); j++)
{
if (Option[j][0] == 50) // request IP address
{
IP = new IPAddress(new byte[] { Option[j][2], Option[j][3], Option[j][4], Option[j][5] });
break;
}
}
}
byte[] b_MacAddress = new byte[packet.hlen];
for (int j = 0; j < packet.hlen; j++)
{
b_MacAddress[j] = packet.chaddr[j];
}
string s_MacAddress = ByteArrayToString(b_MacAddress);
Item item = new Item();
item.macaddress = s_MacAddress;
item.ip = IP.ToString();
Int64 epoch = (int)(DateTime.UtcNow - new DateTime(1970, 1, 1)).TotalSeconds; // setup item
item.time = epoch + network_config.leasetime;
bool flag2 = false;
for (int j = 0; j < table.Count(); j++)
{
if (table[j].ip == item.ip)
{
if (table[j].macaddress == item.macaddress) // goi tin dang xin gia han
{
table.RemoveAt(j); // xoa goi cu
flag2 = true;
}
else
{
Send_DHCPNak(packet);
return;
}
}
}
if (flag1 || flag2) // La goi tin dhcp request seleting thi xac nhan, neu la cac goi tin renew, reboot thi phai co san IP trong bang
{
table.Add(item); // add goi moi vo
Send_DHCPAck(packet, IP); // send goi ack
}
}
else // goi dhcp release
{
IPAddress IP = new IPAddress(packet.ciaddr);
byte[] b_MacAddress = new byte[packet.hlen];
for (int j = 0; j < packet.hlen; j++)
{
b_MacAddress[j] = packet.chaddr[j];
}
string s_mac_address = ByteArrayToString(b_MacAddress);
for (int j = 0; j < table.Count(); j++) // Duyet ban va xoa di ip
{
if (table[j].ip == IP.ToString() || table[j].macaddress == s_mac_address)
{
table.RemoveAt(j);
j--;
}
}
}
break;
}
}
}
public DetailPacket(DHCPPacket packet)
{
InitializeComponent();
rtbMessage.Text = packet.ToText();
}
void HandlePacket(DHCPPacket packet)
{
// Xu li khi nhan goi DHCP tu server
byte[] p = new byte[6];
bool d = xid.Contains(ByteArrayToString(packet.xid));
if (!d) // neu xid khong thuoc cac xid da gui
{
return;
}
List <byte[]> Option = packet.optionsplit();
for (int i = 0; i < Option.Count(); i++)
{
if (Option[i][0] == 53) // dhcp messeage type
{
if (Option[i][2] == 2) // xac dinh dhcp offer
{
if (!DHCPServer_IP.SequenceEqual(new byte[] { 0, 0, 0, 0 }))
{
return; // if we already have choose dhcp server, so not doing anything
}
for (int j = 0; j < Option.Count(); j++)
{
if (Option[j][0] == 54) // server dhcp minh da chon
{
for (int z = 0; z < 4; z++)
{
DHCPServer_IP[z] = Option[j][z + 2];
}
offer_saved = packet;
break;
}
}
Send_DHCPRequest(packet, DHCPServer_IP, 1); // gui goi tin request gom goi dhcp offer va dhcp server da chon
}
else if (Option[i][2] == 5) // Xac dinh day la goi dhcp ack
{
FileStream fs;
try
{
fs = new FileStream("IP", FileMode.Create);
byte[] save = offer_saved.DHCPPacketToBytes();
fs.Write(save, 0, save.Length);
fs.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Can not save offer_packet");
}
ip = new IPAddress(packet.yiaddr);
for (int j = 0; j < Option.Count(); j++)
{
if (Option[j][0] == 1)
{
subnetmask = new IPAddress(new byte[] { Option[j][2], Option[j][3], Option[j][4], Option[j][5] });
}
if (Option[j][0] == 3)
{
defaultgateway = new IPAddress(new byte[] { Option[j][2], Option[j][3], Option[j][4], Option[j][5] });
}
if (Option[j][0] == 6)
{
dns = new IPAddress(new byte[] { Option[j][2], Option[j][3], Option[j][4], Option[j][5] });
}
if (Option[j][0] == 51)
{
Int64 epoch = (int)(DateTime.UtcNow - new DateTime(1970, 1, 1)).TotalSeconds;
Int64 leasetime = BitConverter.ToInt32(new byte[] { Option[j][2], Option[j][3], Option[j][4], Option[j][5] }, 0);
time = epoch + leasetime;
t1 = epoch + (int)(leasetime * 0.5);
t2 = epoch + (int)(leasetime * 0.875);
}
}
haveip = true;
}
else // Goi tin DHCP Nak
{
for (int j = 0; j < Option.Count(); j++)
{
if (Option[j][0] == 54) // server dhcp minh da chon
{
for (int z = 0; z < 4; z++)
{
if (DHCPServer_IP[z] != Option[j][z + 2]) // Neu khong phai server dhcp da chon
{
return;
}
}
Send_DHCPDiscover(); // Chuyen ve trang thai requesting
return;
}
}
}
return;
}
}
}
protected override void Run()
{
/**
* Packet creation and parsing tests
**/
/** Ethernet Packet Parsing Test **/
byte[] ethernetPacketData = new byte[]
{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x0C, 0x29, 0xD5, 0xDB, 0x9D, 0x08, 0x00
};
EthernetPacket ethernetPacket = new EthernetPacket(ethernetPacketData);
Equals(ethernetPacketData, ethernetPacket.RawData);
/** IP Packet Parsing Test **/
byte[] ipPacketData = new byte[]
{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x0C, 0x29, 0xD5, 0xDB, 0x9D, 0x08, 0x00, 0x45, 0x00, 0x01, 0x16, 0x00, 0x00, 0x00, 0x00, 0x80, 0x11, 0x39,
0xD8, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF
};
IPPacket ipPacket = new IPPacket(ipPacketData);
Equals(ipPacketData, ipPacket.RawData);
/** UDP Packet Parsing Test **/
byte[] udpPacketData = new byte[]
{
0x98, 0xFA, 0x9B, 0xD4, 0xEB, 0x29, 0xD8, 0xCE, 0x3A, 0x89, 0x3E, 0xD9, 0x08, 0x00, 0x45, 0x00, 0x00, 0x22, 0x0C, 0x74, 0x40, 0x00, 0x40, 0x11, 0xAA,
0xBE, 0xC0, 0xA8, 0x01, 0x02, 0xC0, 0xA8, 0x01, 0x46, 0x10, 0x92, 0x10, 0x92, 0x00, 0x0E, 0x37, 0x22, 0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x21
};
UDPPacket udpPacket = new UDPPacket(udpPacketData);
Equals(udpPacketData, udpPacket.RawData);
/** DNS Packet Parsing Test **/
byte[] dnsPacketData = new byte[]
{
0xB8, 0xD9, 0x4D, 0xC1, 0xA5, 0xFC, 0x98, 0xFA, 0x9B, 0xD4, 0xEB, 0x29, 0x08, 0x00, 0x45, 0x00, 0x00, 0x38, 0xC3, 0x1C, 0x00, 0x00, 0x80, 0x11, 0x00,
0x00, 0xC0, 0xA8, 0x01, 0x46, 0xC0, 0xA8, 0x01, 0xFE, 0xF0, 0x66, 0x00, 0x35, 0x00, 0x24, 0x84, 0xCA, 0xD6, 0x80, 0x01, 0x00, 0x00, 0x01, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x06, 0x67, 0x69, 0x74, 0x74, 0x65, 0x72, 0x03, 0x63, 0x6F, 0x6D, 0x00, 0x00, 0x01, 0x00, 0x01
};
DNSPacket dnsPacket = new DNSPacket(dnsPacketData);
Equals(dnsPacketData, dnsPacket.RawData);
/** DHCP Packet Parsing Test **/
byte[] dhcpPacketData = new byte[]
{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xB8, 0xD9, 0x4D, 0xC1, 0xA5, 0xFC, 0x08, 0x00, 0x45, 0xC0, 0x01, 0x59, 0x46, 0x3F, 0x00, 0x00, 0x40, 0x11, 0x6F,
0xEF, 0xC0, 0xA8, 0x01, 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x43, 0x00, 0x44, 0x01, 0x45, 0xD3, 0xC8, 0x02, 0x01, 0x06, 0x00, 0x84, 0xA9, 0x5A, 0x66,
0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0xC0, 0xA8, 0x01, 0x47, 0xC0, 0xA8, 0x01, 0xFE, 0x00, 0x00, 0x00, 0x00, 0x34, 0xE1, 0x2D, 0xA3, 0x06,
0x29, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x63, 0x82, 0x53, 0x63, 0x35, 0x01, 0x05, 0x36, 0x04, 0xC0, 0xA8, 0x01, 0xFE, 0x33, 0x04, 0x00, 0x01, 0x51, 0x80, 0x3A, 0x04, 0x00,
0x00, 0xA8, 0xC0, 0x3B, 0x04, 0x00, 0x01, 0x27, 0x50, 0x1C, 0x04, 0xC0, 0xA8, 0x01, 0xFF, 0x51, 0x12, 0x03, 0xFF, 0xFF, 0x44, 0x45, 0x53, 0x4B, 0x54,
0x4F, 0x50, 0x2D, 0x49, 0x51, 0x48, 0x4A, 0x33, 0x31, 0x43, 0x06, 0x04, 0xC0, 0xA8, 0x01, 0xFE, 0x0F, 0x03, 0x6C, 0x61, 0x6E, 0x03, 0x04, 0xC0, 0xA8,
0x01, 0xFE, 0x01, 0x04, 0xFF, 0xFF, 0xFF, 0x00, 0xFF
};
DHCPPacket dhcpPacket = new DHCPPacket(dhcpPacketData);
Equals(dhcpPacketData, dhcpPacket.RawData);
/** ARP Packet Parsing Test **/
byte[] arpPacketData = new byte[]
{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xB8, 0xD9, 0x4D, 0xC1, 0xA5, 0xFC, 0x08, 0x06, 0x00, 0x01, 0x08, 0x00, 0x06, 0x04, 0x00, 0x01, 0xB8, 0xD9, 0x4D,
0xC1, 0xA5, 0xFC, 0xC0, 0xA8, 0x01, 0xFE, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xC0, 0xA8, 0x01, 0x46, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
ARPPacket arpPacket = new ARPPacket(arpPacketData);
Equals(arpPacketData, arpPacket.RawData);
TestController.Completed();
/**
* Clients tests
**/
var dhcpCLient = new DHCPClient();
dhcpCLient.Close();
var dnsClient = new DnsClient();
dnsClient.Close();
var udpClient = new UdpClient();
udpClient.Close();
var icmpClient = new ICMPClient();
icmpClient.Close();
}