private void PopulateScreen(PackageDetail package)
{
if (package == null)
{
MessageBox.Show("Package does not exist! Enter a valid package.", null, MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
if (package.TcpPacket != null)
{
packageType.Text = "TCP PACKET";
headerText.Text += SetHeader(package.TcpPacket.Header);
checksumText.Text += package.TcpPacket.Checksum.ToString() + " - is " + BooleanToString(package.TcpPacket.ValidChecksum, 1);
windowsSizeText.Text += package.TcpPacket.WindowSize.ToString();
sequenceNumberText.Text += package.TcpPacket.SequenceNumber.ToString();
acknowledgmentNumberText.Text += package.TcpPacket.AcknowledgmentNumber.ToString();
dataOffsetText.Text += package.TcpPacket.DataOffset.ToString();
sourceAndDestinationText.Text += SetAddress(package.IpPacket, package.TcpPacket);
flagsText.Text += "\n" + BooleanToString(package.TcpPacket.CWR) + " -> Congestion Window Reduced (CWR)";
flagsText.Text += "\n" + BooleanToString(package.TcpPacket.ECN) + " -> ECN-Echo";
flagsText.Text += "\n" + BooleanToString(package.TcpPacket.Urg) + " -> Urgent";
flagsText.Text += "\n" + BooleanToString(package.TcpPacket.Ack) + " -> Acknowledgment";
flagsText.Text += "\n" + BooleanToString(package.TcpPacket.Psh) + " -> Push";
flagsText.Text += "\n" + BooleanToString(package.TcpPacket.Rst) + " -> Reset";
flagsText.Text += "\n" + BooleanToString(package.TcpPacket.Syn) + " -> Syn";
flagsText.Text += "\n" + BooleanToString(package.TcpPacket.Fin) + " -> Fin";
}
else if (package.UdpPacket != null)
{
packageType.Text = "UDP PACKET";
headerText.Text += SetHeader(package.UdpPacket.Header);
checksumText.Text += package.UdpPacket.Checksum.ToString() + " - is " + BooleanToString(package.UdpPacket.ValidChecksum, 1);
sourceAndDestinationText.Text += SetAddress(package.IpPacket, package.UdpPacket);
windowsSizeText.Text = sequenceNumberText.Text = acknowledgmentNumberText.Text = dataOffsetText.Text = flagsText.Text = "";
}
}
private void device_OnPacketArrival(object sender, CaptureEventArgs packet)
{
Packet pack = Packet.ParsePacket(packet.Packet.LinkLayerType, packet.Packet.Data);
TcpPacket tcpPacket = (TcpPacket)pack.Extract(typeof(TcpPacket));
DateTime time = packet.Packet.Timeval.Date;
int len = packet.Packet.Data.Length;
if (tcpPacket != null)
{
IpPacket ipPacket = (IpPacket)tcpPacket.ParentPacket;
var packageDetail = new PackageDetail(tcpPacket, null, ipPacket);
packageDetailList.Add(packageDetail);
var srcIp = ipPacket.SourceAddress;
var dstIp = ipPacket.DestinationAddress;
var srcPort = tcpPacket.SourcePort;
var dstPort = tcpPacket.DestinationPort;
writeLine = string.Format("ID: {9} - {0}:{1}:{2},{3} - TCP Packet: {5}:{6} -> {7}:{8}\n\n",
time.Hour, time.Minute, time.Second, time.Millisecond, len,
srcIp, srcPort, dstIp, dstPort, packageDetail.Id);
Invoke(new MethodInvoker(updateLog));
}
else
{
UdpPacket udpPacket = (UdpPacket)pack.Extract(typeof(UdpPacket));
time = packet.Packet.Timeval.Date;
len = packet.Packet.Data.Length;
if (udpPacket != null)
{
IpPacket ipPacket = (IpPacket)udpPacket.ParentPacket;
var packageDetail = new PackageDetail(null, udpPacket, ipPacket);
packageDetailList.Add(packageDetail);
IPAddress srcIp = ipPacket.SourceAddress;
IPAddress dstIp = ipPacket.DestinationAddress;
ushort srcPort = udpPacket.SourcePort;
ushort dstPort = udpPacket.DestinationPort;
writeLine = (string.Format("ID: {9} - {0}:{1}:{2},{3} - UDP Packet: {5}:{6} -> {7}:{8}\n",
time.Hour, time.Minute, time.Second, time.Millisecond, len,
srcIp, srcPort, dstIp, dstPort, packageDetail.Id));
Invoke(new MethodInvoker(updateLog));
if (decodeMode == true)
{
byte[] packetBytes = udpPacket.PayloadData;
int version = SnmpPacket.GetProtocolVersion(packetBytes, packetBytes.Length);
switch (version)
{
case (int)SnmpVersion.Ver1:
SnmpV1Packet snmpPacket = new SnmpV1Packet();
try
{
snmpPacket.decode(packetBytes, packetBytes.Length);
writeLine = "SNMP.V1 Packet: " + snmpPacket.ToString();
}
catch (Exception e)
{
writeLine = e.ToString();
}
break;
case (int)SnmpVersion.Ver2:
SnmpV2Packet snmp2Packet = new SnmpV2Packet();
try
{
snmp2Packet.decode(packetBytes, packetBytes.Length);
writeLine = "SNMP.V2 Packet: " + snmp2Packet.ToString();
}
catch (Exception e)
{
writeLine = e.ToString();
}
break;
case (int)SnmpVersion.Ver3:
SnmpV3Packet snmp3Packet = new SnmpV3Packet();
try
{
snmp3Packet.decode(packetBytes, packetBytes.Length);
writeLine = "SNMP.V3 Packet: " + snmp3Packet.ToString();
}
catch (Exception e)
{
writeLine = e.ToString();
}
break;
}
Invoke(new MethodInvoker(updateLog));
}
}
}
}