public IPv4Packet CreateIPv4Packet(EthernetPacket ethernetHeader)
{
int ipv4PacketTotalLength = Int32.Parse(textBoxTotalLength.Text);
byte[] bytes = new byte[EthernetFields_Fields.ETH_HEADER_LEN + ipv4PacketTotalLength];
IPv4Packet ipv4Packet = new IPv4Packet(
EthernetFields_Fields.ETH_HEADER_LEN,
bytes);
// Ethernet fields
ipv4Packet.EthernetHeader = ethernetHeader.Bytes;
// IP fields
ipv4Packet.Version = 4;
ipv4Packet.IPHeaderLength = IPv4Fields_Fields.IP_HEADER_LEN;
ipv4Packet.TypeOfService = Int32.Parse(textBoxDS.Text);
ipv4Packet.IPTotalLength = ipv4PacketTotalLength;
ipv4Packet.Id = 0;
ipv4Packet.FragmentFlags = Int32.Parse(textBoxFlags.Text);
ipv4Packet.FragmentOffset = 0;
ipv4Packet.TimeToLive = Int32.Parse(textBoxTTL.Text);
ipv4Packet.IPProtocol = (IPProtocol.IPProtocolType)((DictionaryEntry)comboBoxIPProtocols.SelectedItem).Key;
ipv4Packet.SourceAddress = IPAddress.Parse(textBoxSourceAddress.Text);
ipv4Packet.DestinationAddress = IPAddress.Parse(textBoxDestinationAddress.Text);
ipv4Packet.ComputeIPChecksum(true);
ipv4Packet.IPData = GetRandomPacketData(ipv4Packet.IPPayloadLength);
return ipv4Packet;
}
private void InitIPPacket(IPVersions version)
{
ipv4 = null;
ipv6 = null;
if (version == IPVersions.IPv4)
{
ipv4 = new IPv4Packet(EthernetHeaderLength, Bytes);
_ipPayloadOffset = _ethPayloadOffset + IPv4Fields_Fields.IP_HEADER_LEN;
}
else if (version == IPVersions.IPv6)
{
ipv6 = new IPv6Packet(EthernetHeaderLength, Bytes);
_ipPayloadOffset = _ethPayloadOffset + IPv6Fields_Fields.IPv6_HEADER_LEN;
}
else
{
throw new System.InvalidOperationException("unknown IPVersions version of " + version);
}
}
private void InitIPPacket(IPVersions version)
{
ipv4 = null;
ipv6 = null;
if (version == IPVersions.IPv4)
{
ipv4 = new IPv4Packet(EthernetHeaderLength, Bytes);
_ipOffset = _ethOffset + IPv4Fields_Fields.IP_HEADER_LEN;
}
else if (version == IPVersions.IPv6)
{
ipv6 = new IPv6Packet(EthernetHeaderLength, Bytes);
_ipOffset = _ethOffset + IPv6Fields_Fields.IPv6_HEADER_LEN;
}
else
{
//lame default
_ipOffset = _ethOffset;
}
}
public TCPPacket CreateTcpPacket(IPv4Packet ipv4Packet)
{
TCPPacket tcpPacket = new TCPPacket(
EthernetFields_Fields.ETH_HEADER_LEN,
ipv4Packet.Bytes);
// TCP fields
tcpPacket.SourcePort = Int32.Parse(textBoxSourcePort.Text);
tcpPacket.DestinationPort = Int32.Parse(textBoxDestinationPort.Text);
tcpPacket.SequenceNumber = Int64.Parse(textBoxSeqNumber.Text);
tcpPacket.AcknowledgmentNumber = Int64.Parse(textBoxAckNumber.Text);
// AllFlags field includes TCPHeaderLength field, so it must be set first
tcpPacket.AllFlags = Int32.Parse(textBoxFlags.Text);
tcpPacket.TCPHeaderLength = Int32.Parse(textBoxHeaderLength.Text);
tcpPacket.WindowSize = Int32.Parse(textBoxWindowSize.Text);
tcpPacket.UrgentPointer = Int32.Parse(textBoxUrgentPointer.Text);
// Calculate checksum
tcpPacket.ComputeTCPChecksum(true);
return tcpPacket;
}
private void InitBlock(IPv4Packet enclosingInstance)
{
this.enclosingInstance = enclosingInstance;
}
public TestProbe(IPv4Packet enclosingInstance)
{
InitBlock(enclosingInstance);
}
private void InitBlock(IPv4Packet enclosingInstance)
{
this.enclosingInstance = enclosingInstance;
}
public TestProbe(IPv4Packet enclosingInstance)
{
InitBlock(enclosingInstance);
}
public ScanMessage Connect(IPEndPoint ipEndPoint)
{
// SYN packet creation
//MAC address of gateway is provided by arp protocol
ARP arper = new ARP(device.Name);
arper.LocalIP = device.Interface.Addresses[0].Addr.ipAddress;
arper.LocalMAC = device.Interface.MacAddress;
PhysicalAddress gatewayHwAddress = arper.Resolve(gatewayAddress);
EthernetPacket ethernetHeader = new EthernetPacket(
device.Interface.MacAddress,
gatewayHwAddress,
EthernetPacketType.IPv4,
null);
byte[] content = new byte[
EthernetFields_Fields.ETH_HEADER_LEN +
IPv4Fields_Fields.IP_HEADER_LEN +
TCPFields_Fields.TCP_HEADER_LEN];
IPv4Packet ipv4Packet = new IPv4Packet(
EthernetFields_Fields.ETH_HEADER_LEN,
content);
// Ethernet header
ipv4Packet.EthernetHeader = ethernetHeader.Bytes;
// IP fields
ipv4Packet.Version = 4;
ipv4Packet.IPHeaderLength = IPv4Fields_Fields.IP_HEADER_LEN;
ipv4Packet.IPTotalLength = content.Length - EthernetFields_Fields.ETH_HEADER_LEN;
ipv4Packet.Id = 100;
ipv4Packet.TimeToLive = 20;
ipv4Packet.IPProtocol = IPProtocol.IPProtocolType.TCP;
ipv4Packet.SourceAddress = device.Interface.Addresses[0].Addr.ipAddress;
ipv4Packet.DestinationAddress = ipEndPoint.Address;
ipv4Packet.ComputeIPChecksum(true);
TCPPacket tcpPacket = new TCPPacket(
EthernetFields_Fields.ETH_HEADER_LEN,
content);
// TCP fields
tcpPacket.SourcePort = 2222;
tcpPacket.DestinationPort = ipEndPoint.Port;
tcpPacket.SequenceNumber = 1000;
tcpPacket.AcknowledgmentNumber = 1000;
tcpPacket.Syn = true;
tcpPacket.TCPHeaderLength = TCPFields_Fields.TCP_HEADER_LEN;
tcpPacket.WindowSize = 555;
// Calculate checksum
tcpPacket.ComputeTCPChecksum(true);
try
{
device.Open(false, 20);
device.SetFilter(String.Format("ip src {0} and tcp src port {1} and tcp dst port {2}",
tcpPacket.DestinationAddress,
tcpPacket.DestinationPort,
tcpPacket.SourcePort));
// Send the packet
device.SendPacket(tcpPacket);
TCPPacket replyPacket = null;
bool replyReceived = false;
Stopwatch watch = new Stopwatch();
watch.Start();
// Condition including timeout check.
while (watch.ElapsedMilliseconds < timeout && replyReceived != true)
{
if ((replyPacket = (TCPPacket)device.GetNextPacket()) != null)
{
replyReceived = true;
}
}
if (!replyReceived) // A reply hasn't been received
{
return ScanMessage.Timeout;
}
else if (replyPacket.Rst) // Remote host reset the connection
{
return ScanMessage.PortClosed;
}
else if (replyPacket.Ack) // Remote host replied with a TCP packet
{
tcpPacket.Syn = false;
tcpPacket.Rst = true;
tcpPacket.WindowSize = 0;
tcpPacket.ComputeTCPChecksum(true);
device.SendPacket(tcpPacket);
return ScanMessage.PortOpened;
}
else
{
return ScanMessage.Unknown;
}
}
catch (Exception)
{
return ScanMessage.Unknown;
}
finally
{
device.Close();
}
}
private void InitIPPacket(IPVersions version)
{
ipv4 = null;
ipv6 = null;
if (version == IPVersions.IPv4)
{
ipv4 = new IPv4Packet(EthernetHeaderLength, Bytes);
_ipPayloadOffset = _ethPayloadOffset + IPv4Fields_Fields.IP_HEADER_LEN;
}
else if (version == IPVersions.IPv6)
{
ipv6 = new IPv6Packet(EthernetHeaderLength, Bytes);
_ipPayloadOffset = _ethPayloadOffset + IPv6Fields_Fields.IPv6_HEADER_LEN;
}
else
{
throw new System.InvalidOperationException("unknown IPVersions version of " + version);
}
}
private void InitIPPacket(IPVersions version)
{
ipv4 = null;
ipv6 = null;
if (version == IPVersions.IPv4)
{
ipv4 = new IPv4Packet(EthernetHeaderLength, Bytes);
_ipOffset = _ethOffset + IPv4Fields_Fields.IP_HEADER_LEN;
}
else if (version == IPVersions.IPv6)
{
ipv6 = new IPv6Packet(EthernetHeaderLength, Bytes);
_ipOffset = _ethOffset + IPv6Fields_Fields.IPv6_HEADER_LEN;
}
else
{
//lame default
_ipOffset = _ethOffset;
}
}
internal static void UpdateIPv4Node(TreeView treeView, IPv4Packet ipv4Packet)
{
TreeNode ipv4Node = treeView.Nodes["IPv4"];
if (ipv4Node == null)
{
ipv4Node = AddIPv4Node(treeView);
}
ipv4Node.Text = String.Format("Internet Protocol V4 (IPv4), Src: {0}, Dst: {1}", ipv4Packet.SourceAddress, ipv4Packet.DestinationAddress);
ipv4Node.Nodes["Version"].Text = String.Format("Version: {0}", ipv4Packet.Version);
ipv4Node.Nodes["IHL"].Text = String.Format("Header length: {0} bytes", ipv4Packet.IPHeaderLength);
TreeNode dsNode = ipv4Node.Nodes["DS"];
dsNode.Text = String.Format("Differentiated Services field: 0x{0:X2}", ipv4Packet.TypeOfService);
dsNode.Nodes["Precedence"].Text = GetIPv4PrecedenceText(ipv4Packet.Precedence);
bool minimizeDelay = ipv4Packet.MinimizeDelay;
dsNode.Nodes["Delay"].Text = String.Format(". . . {0} . . . . = Delay: {1}", minimizeDelay ? "1" : "0", minimizeDelay ? "Low" : "Normal");
bool maximizeThroughput = ipv4Packet.MaximizeThroughput;
dsNode.Nodes["Throughput"].Text = String.Format(". . . . {0} . . . = Throughput: {1}", maximizeThroughput ? "1" : "0", maximizeThroughput ? "High" : "Normal");
bool maximizeReliability = ipv4Packet.MaximizeReliability;
dsNode.Nodes["Reliability"].Text = String.Format(". . . . . {0} . . = Reliability: {1}", maximizeReliability ? "1" : "0", maximizeReliability ? "High" : "Normal");
bool minimizeCost = ipv4Packet.MinimizeMonetaryCost;
dsNode.Nodes["Cost"].Text = String.Format(". . . . . . {0} . = Cost: {1}", minimizeCost ? "1" : "0", minimizeCost ? "Minimize Monetary Cost" : "Normal");
ipv4Node.Nodes["TotalLength"].Text = String.Format("Total length: {0} bytes", ipv4Packet.IPTotalLength);
ipv4Node.Nodes["Id"].Text = String.Format("Identification: 0x{0:X4} ({0})", ipv4Packet.Id);
TreeNode flagsNode = ipv4Node.Nodes["Flags"];
flagsNode.Text = String.Format("Flags: 0x{0:X2}", ipv4Packet.FragmentFlags);
flagsNode.Nodes["Reserved"].Text = String.Format("{0} . . = Reserved bit: {1}", ipv4Packet.ReservedFlag ? "1" : "0", ipv4Packet.ReservedFlag ? "Set" : "Not set");
flagsNode.Nodes["DF"].Text = String.Format(". {0} . = Don't fragment: {1}", ipv4Packet.DontFragment ? "1" : "0", ipv4Packet.DontFragment ? "Set" : "Not set");
flagsNode.Nodes["MF"].Text = String.Format(". . {0} = More fragments: {1}", ipv4Packet.MoreFragments ? "1" : "0", ipv4Packet.MoreFragments ? "Set" : "Not set");
ipv4Node.Nodes["FragmentOffset"].Text = String.Format("Fragment offset: {0}", ipv4Packet.FragmentOffset);
ipv4Node.Nodes["TTL"].Text = String.Format("Time to live: {0}", ipv4Packet.TimeToLive);
ipv4Node.Nodes["Protocol"].Text = String.Format("Protocol: {0}", IPProtocol.getDescription(ipv4Packet.IPProtocol));
ipv4Node.Nodes["Checksum"].Text = String.Format("Header checksum: 0x{0:X4} ({1})", ipv4Packet.IPChecksum, ipv4Packet.ValidIPChecksum ? "correct" : "incorrect");
ipv4Node.Nodes["SA"].Text = String.Format("Source address: {0}", ipv4Packet.SourceAddress);
ipv4Node.Nodes["DA"].Text = String.Format("Destination address: {0}", ipv4Packet.DestinationAddress);
}
