/// <summary>
///
/// </summary>
/// <param name="data">
///
/// </param>
private void NewPacket(byte[] data)
{
// store the time the packet arrived
m_stop = Environment.TickCount;
// parse out the ip header
IpV4Packet ipPacket = new IpV4Packet(data);
// double check to make sure this is an icmp packet
if (ipPacket.TransportProtocol != ProtocolType.Icmp)
{
return;
}
// parse out the icmp packet
IcmpPacket icmpPacket = new IcmpPacket(ipPacket.Data);
// if this is an echo reply
if (icmpPacket.MessageType == IcmpMessageType.EchoReply)
{
// deserialize the packet
IcmpEcho echo = new IcmpEcho(icmpPacket);
// if this packet matches our identifier, and destination address
if (echo.Identifier == m_id &&
ipPacket.SourceAddress.Equals(m_remoteAddress))
{
// disable the timeout timer
m_timer.Enabled = false;
// raise the event
if (PingReply != null)
{
PingReply(ipPacket, icmpPacket, (int)((uint)m_stop - (uint)m_start));
}
// reset the id back to 0 so we can resume sending packets.
m_id = 0;
// signal the wait event
m_waitObject.Set();
}
}
}
/// <summary>
/// Log a new ICMP packet.
/// </summary>
/// <param name="packet">
/// The packet to log.
/// </param>
public void LogPacket(IcmpPacket packet)
{
lock (m_logger.XmlWriter)
{
// <IcmpHeader>
m_logger.XmlWriter.WriteStartElement ("IcmpHeader");
m_logger.XmlWriter.WriteElementString ("Type", packet.MessageType.ToString());
m_logger.XmlWriter.WriteElementString ("Checksum", packet.Checksum.ToString());
#region Specific ICMP Types
switch (packet.MessageType)
{
case IcmpMessageType.DestinationUnreachable:
IcmpDestinationUnreachable option1 = new IcmpDestinationUnreachable (packet);
m_logger.XmlWriter.WriteElementString ("Code", option1.Code.ToString());
break;
case IcmpMessageType.Echo:
IcmpEcho option2 = new IcmpEcho (packet);
m_logger.XmlWriter.WriteElementString ("Identifier", option2.Identifier.ToString());
m_logger.XmlWriter.WriteElementString ("SequenceNumber", option2.SequenceNumber.ToString());
m_logger.XmlWriter.WriteElementString ("DataLength", (option2.Data != null ? option2.Data.Length : 0) + " bytes");
m_logger.XmlWriter.WriteElementString ("Data", (option2.Data != null ? System.Text.ASCIIEncoding.ASCII.GetString (option2.Data) : string.Empty));
break;
case IcmpMessageType.EchoReply:
IcmpEcho option3 = new IcmpEcho (packet);
m_logger.XmlWriter.WriteElementString ("Identifier", option3.Identifier.ToString());
m_logger.XmlWriter.WriteElementString ("SequenceNumber", option3.SequenceNumber.ToString());
m_logger.XmlWriter.WriteElementString ("DataLength", (option3.Data != null ? option3.Data.Length : 0) + " bytes");
m_logger.XmlWriter.WriteElementString ("Data", (option3.Data != null ? System.Text.ASCIIEncoding.ASCII.GetString (option3.Data) : string.Empty));
break;
case IcmpMessageType.ParameterProblem:
IcmpParameterProblem option4 = new IcmpParameterProblem (packet);
m_logger.XmlWriter.WriteElementString ("Pointer", option4.ErrorPointer.ToString());
break;
case IcmpMessageType.Redirect:
IcmpRedirect option5 = new IcmpRedirect (packet);
m_logger.XmlWriter.WriteElementString ("Gateway", option5.GatewayAddress.ToString());
break;
case IcmpMessageType.SourceQuench:
break;
case IcmpMessageType.TimeExceeded:
break;
case IcmpMessageType.TimeStamp:
break;
case IcmpMessageType.TimestampReply:
break;
}
#endregion
m_logger.XmlWriter.WriteEndElement ();
// </IcmpHeader>
}
}
/// <summary>
/// Send a new ping packet.
/// </summary>
/// <param name="destination">
/// The address to send the packet to.
/// </param>
/// <param name="payload">
/// The data to send in the ping.
/// </param>
/// <param name="async">
/// If this is true, SendPing will return immediately otherwise it will wait
/// </param>
/// <param name="timeOutTime">
/// The number of milliseconds before the reply times out.
/// </param>
/// <exception cref="ObjectDisposedException">
/// If the class has been disposed then an ObjectDisposedException will be thrown.
/// </exception>
/// <exception cref="Exception">
/// If the class is already waiting for a ping reply then an exception will be thrown.
/// Use the CancelPing method first.
/// </exception>
public void SendPing(IPAddress destination, byte[] payload, bool async, double timeOutTime)
{
if (m_disposed)
{
throw new ObjectDisposedException(this.ToString(), "This object has already been disposed");
}
// check if a ping is already in process
if (m_id != 0)
{
throw new Exception("A ping request is already in process. Either wait for the reply, or cancel the request first");
}
Random random = new Random();
IcmpEcho echo = new IcmpEcho();
// generate random identifier and sequence number
echo.Identifier = (ushort)random.Next(ushort.MaxValue);
echo.SequenceNumber = (ushort)random.Next(ushort.MaxValue);
m_id = echo.Identifier;
m_remoteAddress = destination;
m_timer.Interval = timeOutTime;
// store the payload
echo.Data = payload;
// build the icmp header
IcmpPacket icmpHeader = echo.Serialize(false);
// build the ip header
IpV4Packet ipHeader = new IpV4Packet();
ipHeader.TransportProtocol = ProtocolType.Icmp;
ipHeader.SourceAddress = m_networkInterface;
ipHeader.DestinationAddress = destination;
ipHeader.Data = icmpHeader.Serialize();
if (m_fragment)
{
IpV4Packet[] fragments = ipHeader.Fragment(8);
// send each fragment
for (int i = 0; i < fragments.Length; i++)
{
byte[] packet = fragments[i].Serialize();
m_socket.SendTo(packet, 0, packet.Length, SocketFlags.None, new IPEndPoint(fragments[i].DestinationAddress, 0));
}
}
else
{
// send the packet
byte[] packet = ipHeader.Serialize();
m_socket.SendTo(packet, 0, packet.Length, SocketFlags.None, new IPEndPoint(ipHeader.DestinationAddress, 0));
}
// save the time and start the timeout timer
m_start = Environment.TickCount;
m_timer.Enabled = true;
// wait for the reply
m_waitObject.Reset();
if (!async)
{
m_waitObject.WaitOne();
}
}
/// <summary>
///
/// </summary>
/// <param name="data">
///
/// </param>
private void NewPacket(byte[] data)
{
// store the time the packet arrived
m_stop = Environment.TickCount;
// parse out the ip header
IpV4Packet ipPacket = new IpV4Packet (data);
// double check to make sure this is an icmp packet
if (ipPacket.TransportProtocol != ProtocolType.Icmp)
{
return;
}
// parse out the icmp packet
IcmpPacket icmpPacket = new IcmpPacket (ipPacket.Data);
// if this is an echo reply
if (icmpPacket.MessageType == IcmpMessageType.EchoReply)
{
// deserialize the packet
IcmpEcho echo = new IcmpEcho (icmpPacket);
// if this packet matches our identifier, and destination address
if (echo.Identifier == m_id &&
ipPacket.SourceAddress.Equals (m_remoteAddress))
{
// disable the timeout timer
m_timer.Enabled = false;
// raise the event
if (PingReply != null)
{
PingReply (ipPacket, icmpPacket, (int)((uint)m_stop - (uint)m_start));
}
// reset the id back to 0 so we can resume sending packets.
m_id = 0;
// signal the wait event
m_waitObject.Set ();
}
}
}
/// <summary>
/// Send a new ping packet.
/// </summary>
/// <param name="destination">
/// The address to send the packet to.
/// </param>
/// <param name="payload">
/// The data to send in the ping.
/// </param>
/// <param name="async">
/// If this is true, SendPing will return immediately otherwise it will wait
/// </param>
/// <param name="timeOutTime">
/// The number of milliseconds before the reply times out.
/// </param>
/// <exception cref="ObjectDisposedException">
/// If the class has been disposed then an ObjectDisposedException will be thrown.
/// </exception>
/// <exception cref="Exception">
/// If the class is already waiting for a ping reply then an exception will be thrown.
/// Use the CancelPing method first.
/// </exception>
public void SendPing(IPAddress destination, byte[] payload, bool async, double timeOutTime)
{
if (m_disposed)
{
throw new ObjectDisposedException (this.ToString(), "This object has already been disposed");
}
// check if a ping is already in process
if (m_id != 0)
{
throw new Exception ("A ping request is already in process. Either wait for the reply, or cancel the request first");
}
Random random = new Random ();
IcmpEcho echo = new IcmpEcho ();
// generate random identifier and sequence number
echo.Identifier = (ushort)random.Next (ushort.MaxValue);
echo.SequenceNumber = (ushort)random.Next (ushort.MaxValue);
m_id = echo.Identifier;
m_remoteAddress = destination;
m_timer.Interval = timeOutTime;
// store the payload
echo.Data = payload;
// build the icmp header
IcmpPacket icmpHeader = echo.Serialize (false);
// build the ip header
IpV4Packet ipHeader = new IpV4Packet ();
ipHeader.TransportProtocol = ProtocolType.Icmp;
ipHeader.SourceAddress = m_networkInterface;
ipHeader.DestinationAddress = destination;
ipHeader.Data = icmpHeader.Serialize ();
if (m_fragment)
{
IpV4Packet[] fragments = ipHeader.Fragment (8);
// send each fragment
for (int i = 0; i < fragments.Length; i++)
{
byte[] packet = fragments[i].Serialize ();
m_socket.SendTo (packet, 0, packet.Length, SocketFlags.None, new IPEndPoint (fragments[i].DestinationAddress, 0));
}
}
else
{
// send the packet
byte[] packet = ipHeader.Serialize ();
m_socket.SendTo (packet, 0, packet.Length, SocketFlags.None, new IPEndPoint (ipHeader.DestinationAddress, 0));
}
// save the time and start the timeout timer
m_start = Environment.TickCount;
m_timer.Enabled = true;
// wait for the reply
m_waitObject.Reset ();
if (!async)
{
m_waitObject.WaitOne ();
}
}
/// <summary>
/// Send the next request in order to find the next hop.
/// </summary>
private void SendRequest()
{
// generate a 32 byte payload
string data = new string ('x', 32);
byte[] payload = System.Text.ASCIIEncoding.ASCII.GetBytes (data);
// fill in ip header fields
IpV4Packet ipPacket = new IpV4Packet ();
ipPacket.DestinationAddress = m_remoteAddress;
ipPacket.SourceAddress = m_localAddress;
ipPacket.TransportProtocol = ProtocolType.Icmp;
ipPacket.TimeToLive = m_ttl;
// save the identification
m_ipId = ipPacket.Identification;
// add routing options if any
if (m_route != null)
{
ipPacket.Options = new IpV4Option[2];
ipPacket.Options[0] = m_route.Serialize (m_strictRouting ? IpV4OptionNumber.StrictSourceRouting : IpV4OptionNumber.LooseSourceRouting);
ipPacket.Options[1] = new IpV4Option ();
ipPacket.Options[1].OptionType = IpV4OptionNumber.EndOfOptions;
ipPacket.Options[1].IsCopied = false;
ipPacket.Options[1].Length = 1;
ipPacket.Options[1].Class = IpV4OptionClass.Control;
ipPacket.Options[1].Data = null;
}
// create a new echo packet
IcmpEcho echo = new IcmpEcho ();
echo.Identifier = m_id;
echo.Data = payload;
// serialize the icmp packet
IcmpPacket icmpPacket = echo.Serialize (false);
ipPacket.Data = icmpPacket.Serialize ();
if (m_fragment)
{
IpV4Packet[] fragments = ipPacket.Fragment (8);
// send each fragment
for (int i = 0; i < fragments.Length; i++)
{
byte[] packet = fragments[i].Serialize ();
m_socket.SendTo (packet, 0, packet.Length, SocketFlags.None, new IPEndPoint (fragments[i].DestinationAddress, 0));
}
}
else
{
// send the ip packet
byte[] packet = ipPacket.Serialize ();
m_socket.SendTo (packet, 0, packet.Length, SocketFlags.None, new IPEndPoint (ipPacket.DestinationAddress, 0));
}
// grab the current time
m_start = Environment.TickCount;
// start the timeout timer
m_timer.Enabled = true;
}
/// <summary>
/// This event occurs whenever a new packet arrives.
/// </summary>
/// <param name="data">
/// The data in the packet.
/// </param>
private void NewPacket(byte[] data)
{
if (!m_working)
{
return;
}
// store the time the packet arrived
m_stop = Environment.TickCount;
// parse out the ip header
IpV4Packet ipPacket = new IpV4Packet (data);
// double check to make sure this is an icmp packet
if (ipPacket.TransportProtocol != ProtocolType.Icmp)
{
return;
}
// parse out the icmp packet
IcmpPacket icmpPacket = new IcmpPacket (ipPacket.Data);
// if this is an echo reply
if (icmpPacket.MessageType == IcmpMessageType.EchoReply)
{
#region Reply From Destination
// deserialize the packet
IcmpEcho echo = new IcmpEcho (icmpPacket);
// if this packet matches our identifier, and destination address
if (echo.Identifier == m_id)
{
// disable the timeout timer
m_timer.Enabled = false;
// raise the event
if (RouteUpdate != null)
{
RouteUpdate (ipPacket.SourceAddress, (int)((uint)m_stop - (uint)m_start), m_ttl);
}
// raise the event
if (TraceFinished != null)
{
TraceFinished ();
}
// signal the wait event
m_waitObject.Set ();
// allow new trace routes
m_working = false;
}
#endregion
}
// if the time to live exceeded then we have a new hop
else if (icmpPacket.MessageType == IcmpMessageType.TimeExceeded)
{
#region Reply From Router
IcmpTimeExceeded icmpTimeExceeded = new IcmpTimeExceeded (icmpPacket);
// make sure this packet is for us
if (m_ipId != icmpTimeExceeded.BadPacket.Identification)
{
return;
}
// disable the timeout timer
m_timer.Enabled = false;
// raise the event
if (RouteUpdate != null && m_working)
{
RouteUpdate (ipPacket.SourceAddress, (int)((uint)m_stop - (uint)m_start), m_ttl);
}
// increment the time to live.
m_ttl++;
// if the max hop count is exceeded
if (m_ttl > m_maxHops)
{
// disable the timeout timer
m_timer.Enabled = false;
// allow new trace routes
m_working = false;
// raise the event
if (MaxHopsExceeded != null)
{
MaxHopsExceeded ();
}
// signal the wait event
m_waitObject.Set ();
}
else
{
// send the next request
SendRequest ();
}
#endregion
}
}
/// <summary>
/// This event occurs whenever a new packet arrives.
/// </summary>
/// <param name="data">
/// The data in the packet.
/// </param>
private void NewPacket(byte[] data)
{
if (!m_working)
{
return;
}
// store the time the packet arrived
m_stop = Environment.TickCount;
// parse out the ip header
IpV4Packet ipPacket = new IpV4Packet(data);
// double check to make sure this is an icmp packet
if (ipPacket.TransportProtocol != ProtocolType.Icmp)
{
return;
}
// parse out the icmp packet
IcmpPacket icmpPacket = new IcmpPacket(ipPacket.Data);
// if this is an echo reply
if (icmpPacket.MessageType == IcmpMessageType.EchoReply)
{
#region Reply From Destination
// deserialize the packet
IcmpEcho echo = new IcmpEcho(icmpPacket);
// if this packet matches our identifier, and destination address
if (echo.Identifier == m_id)
{
// disable the timeout timer
m_timer.Enabled = false;
// raise the event
if (RouteUpdate != null)
{
RouteUpdate(ipPacket.SourceAddress, (int)((uint)m_stop - (uint)m_start), m_ttl);
}
// raise the event
if (TraceFinished != null)
{
TraceFinished();
}
// signal the wait event
m_waitObject.Set();
// allow new trace routes
m_working = false;
}
#endregion
}
// if the time to live exceeded then we have a new hop
else if (icmpPacket.MessageType == IcmpMessageType.TimeExceeded)
{
#region Reply From Router
IcmpTimeExceeded icmpTimeExceeded = new IcmpTimeExceeded(icmpPacket);
// make sure this packet is for us
if (m_ipId != icmpTimeExceeded.BadPacket.Identification)
{
return;
}
// disable the timeout timer
m_timer.Enabled = false;
// raise the event
if (RouteUpdate != null && m_working)
{
RouteUpdate(ipPacket.SourceAddress, (int)((uint)m_stop - (uint)m_start), m_ttl);
}
// increment the time to live.
m_ttl++;
// if the max hop count is exceeded
if (m_ttl > m_maxHops)
{
// disable the timeout timer
m_timer.Enabled = false;
// allow new trace routes
m_working = false;
// raise the event
if (MaxHopsExceeded != null)
{
MaxHopsExceeded();
}
// signal the wait event
m_waitObject.Set();
}
else
{
// send the next request
SendRequest();
}
#endregion
}
}
/// <summary>
/// Send the next request in order to find the next hop.
/// </summary>
private void SendRequest()
{
// generate a 32 byte payload
string data = new string ('x', 32);
byte[] payload = System.Text.ASCIIEncoding.ASCII.GetBytes(data);
// fill in ip header fields
IpV4Packet ipPacket = new IpV4Packet();
ipPacket.DestinationAddress = m_remoteAddress;
ipPacket.SourceAddress = m_localAddress;
ipPacket.TransportProtocol = ProtocolType.Icmp;
ipPacket.TimeToLive = m_ttl;
// save the identification
m_ipId = ipPacket.Identification;
// add routing options if any
if (m_route != null)
{
ipPacket.Options = new IpV4Option[2];
ipPacket.Options[0] = m_route.Serialize(m_strictRouting ? IpV4OptionNumber.StrictSourceRouting : IpV4OptionNumber.LooseSourceRouting);
ipPacket.Options[1] = new IpV4Option();
ipPacket.Options[1].OptionType = IpV4OptionNumber.EndOfOptions;
ipPacket.Options[1].IsCopied = false;
ipPacket.Options[1].Length = 1;
ipPacket.Options[1].Class = IpV4OptionClass.Control;
ipPacket.Options[1].Data = null;
}
// create a new echo packet
IcmpEcho echo = new IcmpEcho();
echo.Identifier = m_id;
echo.Data = payload;
// serialize the icmp packet
IcmpPacket icmpPacket = echo.Serialize(false);
ipPacket.Data = icmpPacket.Serialize();
if (m_fragment)
{
IpV4Packet[] fragments = ipPacket.Fragment(8);
// send each fragment
for (int i = 0; i < fragments.Length; i++)
{
byte[] packet = fragments[i].Serialize();
m_socket.SendTo(packet, 0, packet.Length, SocketFlags.None, new IPEndPoint(fragments[i].DestinationAddress, 0));
}
}
else
{
// send the ip packet
byte[] packet = ipPacket.Serialize();
m_socket.SendTo(packet, 0, packet.Length, SocketFlags.None, new IPEndPoint(ipPacket.DestinationAddress, 0));
}
// grab the current time
m_start = Environment.TickCount;
// start the timeout timer
m_timer.Enabled = true;
}
