//ICMP协议的Info
private string setIcmpInfo(ICMPv4Packet ICMP, string MF, int OFF)
{
//string type = ICMP.Header[0].ToString("D");
if (isFragment(MF, OFF) && OFF != 0)
return "Fragment packet";
else if (isFragment(MF, OFF) && OFF == 0)
{
switch (ICMP.Header[0].ToString("D"))
{
case "8":
return "Fragment packet. Echo (ping) request id=0x" + ICMP.ID.ToString("X4") + ", seq=" + ICMP.Sequence;
case "0":
return "Fragment packet. Echo (ping) reply id=0x" + ICMP.ID.ToString("X4") + ", seq=" + ICMP.Sequence;
case "3":
return "Fragment packet. Destination unreachable";
default:
return "Fragment packet. Unknown type/code";
}
}
else
{
switch (ICMP.Header[0].ToString("D"))
{
case "8":
return "Echo (ping) request id=0x" + ICMP.ID.ToString("X4") + ", seq=" + ICMP.Sequence;
case "0":
return "Echo (ping) reply id=0x" + ICMP.ID.ToString("X4") + ", seq=" + ICMP.Sequence;
case "3":
return "Destination unreachable";
default:
return "Unknown type/code";
}
}
}
public int sendPacket()
{
byte[] bytes = new byte[4096];
ByteArraySegment bas = new ByteArraySegment(bytes);
ushort srcPort = 23444;
ushort dstPort = 12345;
PacketDotNet.UdpPacket udpPacket = new UdpPacket(srcPort, dstPort);
string cmdString = "xxxxyyyyHello world!";
byte[] sendBuffer = Encoding.ASCII.GetBytes(cmdString);
udpPacket.PayloadData = sendBuffer;
ICMPv4Packet icmpPacket = new ICMPv4Packet(new ByteArraySegment(sendBuffer));
// sanity check:
//bas.BytesLength = 10;
//Console.WriteLine("bas - Offset = " + bas.Offset + " len= " + bas.Length);
IPAddress ipSrcAddr = System.Net.IPAddress.Parse("192.168.0.186"); // laptop
IPAddress ipDestAddr = System.Net.IPAddress.Parse("192.168.0.185"); // my linux box
IpPacket ipPacket = new IPv4Packet(ipSrcAddr, ipDestAddr);
ipPacket.PayloadPacket = udpPacket;
icmpPacket.TypeCode = ICMPv4TypeCodes.Unassigned1;
icmpPacket.Sequence = 1;
Console.WriteLine("icmpPacket - TypeCode = " + icmpPacket.TypeCode + " Sequence= " + icmpPacket.Sequence);
Console.WriteLine("icmpPacket : " + icmpPacket.PrintHex());
icmpPacket.UpdateCalculatedValues();
Console.WriteLine("icmpPacket : " + icmpPacket.PrintHex());
//ushort etype = 0xFF00; //EthernetPacketType RAW ?
System.Net.NetworkInformation.PhysicalAddress ethSrcAddr = System.Net.NetworkInformation.PhysicalAddress.Parse("02-1E-EC-8F-7F-E1");
System.Net.NetworkInformation.PhysicalAddress ethDstAddr = System.Net.NetworkInformation.PhysicalAddress.Parse("48-5B-39-ED-96-36");
EthernetPacket ethernetPacket = new EthernetPacket(ethSrcAddr, ethDstAddr, EthernetPacketType.IpV4);
// I thought "None" for type would fill in type automatically; but it remained zero on the wire and was flagged "Malformed"
ethernetPacket.PayloadPacket = icmpPacket;
Console.WriteLine("ethernetPacket : " + ethernetPacket.PrintHex());
ethernetPacket.Type = EthernetPacketType.IpV4;
Console.WriteLine("ethernetPacket : " + ethernetPacket.PrintHex());
//ipPacket.PayloadPacket = udpPacket;
//ethernetPacket.PayloadPacket = gmpPacket; //ipPacket;
ethernetPacket.UpdateCalculatedValues();
Console.WriteLine(ethernetPacket.ToString());
ipPacket.UpdateCalculatedValues();
//udpPacket.UpdateUDPChecksum();
// Experiment with raw ip packet?
ipPacket.Protocol = IPProtocolType.RAW;
// Why isn't ValidChecksum true?
//Console.WriteLine("After updating calculated values, ValidUDPChecksum = " + udpPacket.ValidUDPChecksum + " ValidChecksum = " + udpPacket.ValidChecksum);
//Console.WriteLine(ethernetPacket.ToString());
device.Open(DeviceMode.Normal, 15000); // 15 sec timeout
//ushort checksum = csum(ipPacket.BytesHighPerformance, ipPacket.P);
device.SendPacket(ethernetPacket);
return 0;
}
void listField(ref ICMPv4Packet p)
{
addField("ICMPv4", "Checksum", p);
addField("ICMPv4", "ID", p);
addField("ICMPv4", "Sequence", p);
addField("ICMPv4", "Type Code", p);
}
public static String ICMPv4Analyzor(ref TreeView tree, ICMPv4Packet icmp4)
{
string info = "\r\n-------- ICMPv4 Header --------\r\n";
TreeNode ICMP4Node = new TreeNode("ICMP(Internet Control Message Protocol)v4 Header");
string type, code, chk, ecp;
try
{
ICMP4Node.Nodes.Add(type = "Type = " + icmp4.TypeCode.ToString());
ICMP4Node.Nodes.Add(code = "Code = " + icmp4.ID.ToString());
ICMP4Node.Nodes.Add(chk = "Checksum = " + icmp4.Checksum.ToString());
info += type + "\r\n" + code + "\r\n" + chk + "\r\n";
}
catch (Exception)
{
ICMP4Node.Nodes.Add(ecp = "ICMP segment or incomplete header");
info += ecp + "\r\n";
}
tree.Nodes.Add(ICMP4Node);
return info;
}