/// <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
}
}
