/// <summary>
/// Serlialize this icmp message into an IcmpPacket which can
/// then be serialized further.
/// </summary>
/// <returns>
/// An IcmpPacket class.
/// </returns>
public override IcmpPacket Serialize()
{
IcmpPacket packet = base.Serialize();
packet.MessageType = IcmpMessageType.SourceQuench;
return(packet);
}
/// <summary>
/// Create a new source quench ICMP packet.
/// </summary>
/// <param name="packet">
/// The ICMP packet to parse.
/// </param>
/// <exception cref="ArgumentNullException">
/// If the packet is null then an argument null exception occurs.
/// </exception>
/// <exception cref="ArgumentException">
/// The packet was not a Source Quench type packet.
/// </exception>
public IcmpSourceQuench(IcmpPacket packet)
{
if (packet.MessageType != IcmpMessageType.SourceQuench)
{
throw new ArgumentException("The packet was not a Source Quench type packet", "packet");
}
base.Constructor(packet);
}
/// <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>
/// Create a new time exceeded ICMP packet.
/// </summary>
/// <param name="packet">
/// The ICMP packet to parse.
/// </param>
/// <exception cref="ArgumentNullException">
/// If the packet is null then an argument null exception occurs.
/// </exception>
/// <exception cref="ArgumentException">
/// The packet was not a Time Exceeded type packet.
/// </exception>
public IcmpTimeExceeded(IcmpPacket packet)
{
if (packet.MessageType != IcmpMessageType.TimeExceeded)
{
throw new ArgumentException("The packet was not a Time Exceeded type packet", "packet");
}
base.Constructor(packet);
m_code = (CodeType)packet.Code;
}
/// <summary>
/// Create a new destination unreachable ICMP packet.
/// </summary>
/// <param name="packet">
/// The ICMP packet to parse.
/// </param>
/// <exception cref="ArgumentNullException">
/// If the packet is null then an argument null exception occurs.
/// </exception>
/// <exception cref="ArgumentException">
/// The packet was not a Destination Unreachable type packet.
/// </exception>
public IcmpDestinationUnreachable(IcmpPacket packet)
{
if (packet.MessageType != IcmpMessageType.DestinationUnreachable)
{
throw new ArgumentException("The packet was not a Destination Unreachable type packet", "packet");
}
base.Constructor(packet);
m_code = (CodeType)packet.Code;
}
/// <summary>
/// Serlialize this icmp message into an IcmpPacket which can
/// then be serialized further.
/// </summary>
/// <returns>
/// An IcmpPacket class.
/// </returns>
public override IcmpPacket Serialize()
{
IcmpPacket packet = base.Serialize();
packet.MessageType = IcmpMessageType.ParameterProblem;
// copy in the pointer
packet.Data[0] = m_pointer;
return(packet);
}
/// <summary>
/// Serlialize this icmp message into an IcmpPacket which can
/// then be serialized further.
/// </summary>
/// <returns>
/// An IcmpPacket class.
/// </returns>
public override IcmpPacket Serialize()
{
IcmpPacket packet = base.Serialize();
packet.MessageType = IcmpMessageType.TimeExceeded;
// copy in the code
packet.Code = (byte)m_code;
return(packet);
}
/// <summary>
/// Serlialize this icmp message into an IcmpPacket which can
/// then be serialized further.
/// </summary>
/// <returns>
/// An IcmpPacket class.
/// </returns>
public override IcmpPacket Serialize()
{
IcmpPacket packet = base.Serialize();
packet.MessageType = IcmpMessageType.DestinationUnreachable;
// copy in the code
packet.Code = (byte)m_code;
return(packet);
}
/// <summary>
/// Create a new parameter problem ICMP packet.
/// </summary>
/// <param name="packet">
/// The ICMP packet to parse.
/// </param>
/// <exception cref="ArgumentNullException">
/// If the packet is null then an argument null exception occurs.
/// </exception>
/// <exception cref="ArgumentException">
/// The packet was not a Parameter Problem type packet.
/// </exception>
public IcmpParameterProblem(IcmpPacket packet)
{
if (packet.MessageType != IcmpMessageType.ParameterProblem)
{
throw new ArgumentException("The packet was not a Time Parameter Problem packet", "packet");
}
base.Constructor(packet);
// extract the pointer
m_pointer = packet.Data[0];
}
/// <summary>
/// Create a new redirect ICMP packet.
/// </summary>
/// <param name="packet">
/// The ICMP packet to parse.
/// </param>
/// <exception cref="ArgumentNullException">
/// If the packet is null then an argument null exception occurs.
/// </exception>
/// <exception cref="ArgumentException">
/// The packet was not a Redirect type packet.
/// </exception>
public IcmpRedirect(IcmpPacket packet)
{
if (packet.MessageType != IcmpMessageType.Redirect)
{
throw new ArgumentException("The packet was not a Redirect type packet", "packet");
}
base.Constructor(packet);
m_code = (CodeType)packet.Code;
// copy out the address
m_gatewayAddress = new IPAddress((long)BitConverter.ToInt32(packet.Data, 4));
}
/// <summary>
/// Serlialize this icmp message into an IcmpPacket which can
/// then be serialized further.
/// </summary>
/// <returns>
/// An IcmpPacket class.
/// </returns>
public virtual IcmpPacket Serialize()
{
IcmpPacket packet = new IcmpPacket();
// serialize the bad packet and allocate enough space in the buffer
// for it
byte[] badPacket = m_badPacket.Serialize();
byte[] buffer = new byte[4 + badPacket.Length];
// copy in the bad packet just after the unused field
Array.Copy(badPacket, 0, buffer, 4, badPacket.Length);
return(packet);
}
/// <summary>
/// Serlialize this icmp message into an IcmpPacket which can
/// then be serialized further.
/// </summary>
/// <returns>
/// An IcmpPacket class.
/// </returns>
public override IcmpPacket Serialize()
{
IcmpPacket packet = base.Serialize();
packet.MessageType = IcmpMessageType.SourceQuench;
// copy in the code
packet.Code = (byte)m_code;
// copy in the address
Array.Copy(m_gatewayAddress.GetAddressBytes(), 0, packet.Data, 4, 4);
return(packet);
}
/// <summary>
/// Create a new generic error ICMP packet.
/// </summary>
/// <param name="packet">
/// The ICMP packet to parse.
/// </param>
/// <exception cref="ArgumentNullException">
/// If the packet is null then an argument null exception occurs.
/// </exception>
public void Constructor(IcmpPacket packet)
{
if (packet == null)
{
throw new ArgumentNullException("packet");
}
// discard the unused field
byte[] tempBuffer = new byte[packet.Data.Length - 4];
Array.Copy(packet.Data, 4, tempBuffer, 0, tempBuffer.Length);
// parse out the packet data
m_badPacket = new IpV4Packet(tempBuffer);
}
void ping_PingReply(Metro.NetworkLayer.IpV4.IpV4Packet ipHeader, Metro.TransportLayer.Icmp.IcmpPacket icmpHeader, int roundTripTime)
{
lock (threadLocker)
{
PingUpdate pu = new PingUpdate();
pu.ipHeader = ipHeader;
pu.icmpHeader = icmpHeader;
pu.RoundTripTime = roundTripTime;
pu.dateReceived = DateTime.Now;
PingList.Add(pu);
pingReady = true;
this.Invoke(mivPing);
}
}
/// <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>
/// Serlialize this icmp message into an IcmpPacket which can
/// then be serialized further.
/// </summary>
/// <param name="reply">
/// If true, this packet is an echo reply, otherwise it is an echo request.
/// </param>
/// <returns>
/// An IcmpPacket class.
/// </returns>
public IcmpPacket Serialize(bool reply)
{
IcmpPacket packet = new IcmpPacket();
packet.MessageType = (reply ? IcmpMessageType.EchoReply : IcmpMessageType.Echo);
// allocate enough space for the data
packet.Data = new byte[4 + (m_data != null ? m_data.Length : 0)];
// copy in the identifier
Array.Copy(BitConverter.GetBytes(IPAddress.HostToNetworkOrder((short)m_identifier)), 0, packet.Data, 0, 2);
// copy in the sequence number
Array.Copy(BitConverter.GetBytes(IPAddress.HostToNetworkOrder((short)m_sequenceNumber)), 0, packet.Data, 2, 2);
// copy in the echo data
Array.Copy(m_data, 0, packet.Data, 4, m_data.Length);
return(packet);
}
/// <summary>
/// Create a new echo ICMP packet.
/// </summary>
/// <param name="packet">
/// The ICMP packet to parse.
/// </param>
/// <exception cref="ArgumentNullException">
/// If the packet is null then an argument null exception occurs.
/// </exception>
/// <exception cref="ArgumentException">
/// The packet was not a Echo packet.
/// </exception>
public IcmpEcho(IcmpPacket packet)
{
if (packet == null)
{
throw new ArgumentNullException("packet");
}
if (packet.MessageType != IcmpMessageType.Echo && packet.MessageType != IcmpMessageType.EchoReply)
{
throw new ArgumentException("The packet was not an Echo or Echo Reply type packet", "packet");
}
// extract the identifier
m_identifier = (ushort)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(packet.Data, 0));
// extract the sequence number
m_sequenceNumber = (ushort)IPAddress.NetworkToHostOrder(BitConverter.ToInt16(packet.Data, 2));
// copy out the data
m_data = new byte[packet.Data.Length - 4];
Array.Copy(packet.Data, 4, m_data, 0, m_data.Length);
}
/// <summary>
/// Create a new destination unreachable ICMP packet.
/// </summary>
/// <param name="packet">
/// The ICMP packet to parse.
/// </param>
/// <exception cref="ArgumentNullException">
/// If the packet is null then an argument null exception occurs.
/// </exception>
/// <exception cref="ArgumentException">
/// The packet was not a Destination Unreachable type packet.
/// </exception>
public IcmpDestinationUnreachable(IcmpPacket packet)
{
if (packet.MessageType != IcmpMessageType.DestinationUnreachable)
{
throw new ArgumentException ("The packet was not a Destination Unreachable type packet", "packet");
}
base.Constructor (packet);
m_code = (CodeType)packet.Code;
}
/// <summary>
/// Create a new time exceeded ICMP packet.
/// </summary>
/// <param name="packet">
/// The ICMP packet to parse.
/// </param>
/// <exception cref="ArgumentNullException">
/// If the packet is null then an argument null exception occurs.
/// </exception>
/// <exception cref="ArgumentException">
/// The packet was not a Time Exceeded type packet.
/// </exception>
public IcmpTimeExceeded(IcmpPacket packet)
{
if (packet.MessageType != IcmpMessageType.TimeExceeded)
{
throw new ArgumentException ("The packet was not a Time Exceeded type packet", "packet");
}
base.Constructor (packet);
m_code = (CodeType)packet.Code;
}
/// <summary>
/// Create a new source quench ICMP packet.
/// </summary>
/// <param name="packet">
/// The ICMP packet to parse.
/// </param>
/// <exception cref="ArgumentNullException">
/// If the packet is null then an argument null exception occurs.
/// </exception>
/// <exception cref="ArgumentException">
/// The packet was not a Source Quench type packet.
/// </exception>
public IcmpSourceQuench(IcmpPacket packet)
{
if (packet.MessageType != IcmpMessageType.SourceQuench)
{
throw new ArgumentException ("The packet was not a Source Quench type packet", "packet");
}
base.Constructor (packet);
}
/// <summary>
/// Create a new redirect ICMP packet.
/// </summary>
/// <param name="packet">
/// The ICMP packet to parse.
/// </param>
/// <exception cref="ArgumentNullException">
/// If the packet is null then an argument null exception occurs.
/// </exception>
/// <exception cref="ArgumentException">
/// The packet was not a Redirect type packet.
/// </exception>
public IcmpRedirect(IcmpPacket packet)
{
if (packet.MessageType != IcmpMessageType.Redirect)
{
throw new ArgumentException ("The packet was not a Redirect type packet", "packet");
}
base.Constructor (packet);
m_code = (CodeType)packet.Code;
// copy out the address
m_gatewayAddress = new IPAddress ((long)BitConverter.ToInt32 (packet.Data, 4));
}
/// <summary>
/// Create a new parameter problem ICMP packet.
/// </summary>
/// <param name="packet">
/// The ICMP packet to parse.
/// </param>
/// <exception cref="ArgumentNullException">
/// If the packet is null then an argument null exception occurs.
/// </exception>
/// <exception cref="ArgumentException">
/// The packet was not a Parameter Problem type packet.
/// </exception>
public IcmpParameterProblem(IcmpPacket packet)
{
if (packet.MessageType != IcmpMessageType.ParameterProblem)
{
throw new ArgumentException ("The packet was not a Time Parameter Problem packet", "packet");
}
base.Constructor (packet);
// extract the pointer
m_pointer = packet.Data[0];
}
/// <summary>
/// Create a new generic error ICMP packet.
/// </summary>
/// <param name="packet">
/// The ICMP packet to parse.
/// </param>
/// <exception cref="ArgumentNullException">
/// If the packet is null then an argument null exception occurs.
/// </exception>
public void Constructor(IcmpPacket packet)
{
if (packet == null)
{
throw new ArgumentNullException ("packet");
}
// discard the unused field
byte[] tempBuffer = new byte[packet.Data.Length - 4];
Array.Copy (packet.Data, 4, tempBuffer, 0, tempBuffer.Length);
// parse out the packet data
m_badPacket = new IpV4Packet (tempBuffer);
}
/// <summary>
/// Serlialize this icmp message into an IcmpPacket which can
/// then be serialized further.
/// </summary>
/// <param name="reply">
/// If true, this packet is an echo reply, otherwise it is an echo request.
/// </param>
/// <returns>
/// An IcmpPacket class.
/// </returns>
public IcmpPacket Serialize(bool reply)
{
IcmpPacket packet = new IcmpPacket ();
packet.MessageType = (reply ? IcmpMessageType.EchoReply : IcmpMessageType.Echo);
// allocate enough space for the data
packet.Data = new byte[4 + (m_data != null ? m_data.Length : 0)];
// copy in the identifier
Array.Copy (BitConverter.GetBytes (IPAddress.HostToNetworkOrder ((short)m_identifier)), 0, packet.Data, 0, 2);
// copy in the sequence number
Array.Copy (BitConverter.GetBytes (IPAddress.HostToNetworkOrder ((short)m_sequenceNumber)), 0, packet.Data, 2, 2);
// copy in the echo data
Array.Copy (m_data, 0, packet.Data, 4, m_data.Length);
return packet;
}
/// <summary>
/// Create a new echo ICMP packet.
/// </summary>
/// <param name="packet">
/// The ICMP packet to parse.
/// </param>
/// <exception cref="ArgumentNullException">
/// If the packet is null then an argument null exception occurs.
/// </exception>
/// <exception cref="ArgumentException">
/// The packet was not a Echo packet.
/// </exception>
public IcmpEcho(IcmpPacket packet)
{
if (packet == null)
{
throw new ArgumentNullException ("packet");
}
if (packet.MessageType != IcmpMessageType.Echo && packet.MessageType != IcmpMessageType.EchoReply)
{
throw new ArgumentException ("The packet was not an Echo or Echo Reply type packet", "packet");
}
// extract the identifier
m_identifier = (ushort)IPAddress.NetworkToHostOrder (BitConverter.ToInt16 (packet.Data, 0));
// extract the sequence number
m_sequenceNumber = (ushort)IPAddress.NetworkToHostOrder (BitConverter.ToInt16 (packet.Data, 2));
// copy out the data
m_data = new byte[packet.Data.Length - 4];
Array.Copy (packet.Data, 4, m_data, 0, m_data.Length);
}
/// <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>
/// 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 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>
/// Serlialize this icmp message into an IcmpPacket which can
/// then be serialized further.
/// </summary>
/// <returns>
/// An IcmpPacket class.
/// </returns>
public virtual IcmpPacket Serialize()
{
IcmpPacket packet = new IcmpPacket ();
// serialize the bad packet and allocate enough space in the buffer
// for it
byte[] badPacket = m_badPacket.Serialize ();
byte[] buffer = new byte[4 + badPacket.Length];
// copy in the bad packet just after the unused field
Array.Copy (badPacket, 0, buffer, 4, badPacket.Length);
return packet;
}