protected virtual bool check_wanted_packet(ref ipv4_header iph)
{
if (this.spyed_protocol == ipv4_header_server.PROTOCOL_ALL)
{
return(true);
}
return(iph.protocol == this.spyed_protocol);
}
protected void thread_watching_reply()
{
int nBytes;
byte[] ReceiveBuffer = new byte[this.us_receive_buffer_size];
ipv4_header iph = new ipv4_header();
byte[] data_buffer;
byte b_ret;
try
{
while (true)
{
nBytes = this.srv_socket.Receive(ReceiveBuffer, 0, this.us_receive_buffer_size, System.Net.Sockets.SocketFlags.None);
if (nBytes > 0)
{
// allow to have an array matching data rcv size (avoid to send the size as parameter for each next methodes)
data_buffer = new byte[nBytes];
System.Array.Copy(ReceiveBuffer, 0, data_buffer, 0, nBytes);
// end allow to have an array matching data rcv size (avoid to send the size as parameter for each next methodes)
// decode ipheader
b_ret = iph.decode(data_buffer, nBytes);
// if decoding was successful
if (b_ret == ipv4_header.error_success)
{
if (this.check_wanted_packet(ref iph))
{
// throw the data arrival event
if (this.event_Socket_Data_Arrival != null)
{
#if (!DEBUG)
try // avoid to close server if error in the event handler code
#endif
{
this.event_Socket_Data_Arrival(iph, new EventArgs_FullPacket(data_buffer));
}
#if (!DEBUG)
catch {}
#endif
}
}
}
else
{
if ((b_ret == ipv4_header.error_datagram_internet_header_length_too_small) ||
(b_ret == ipv4_header.error_datagram_total_length_too_small))
{
// send
if (this.event_Socket_RcvPacket_Error != null)
{
this.event_Socket_RcvPacket_Error(this, new EventArgs_Exception_Packet(new Exception("Error in Ipv4 header"), data_buffer));
}
}
}
}
}
}
catch (Exception e)
{
// close socket
this.close_socket();
if (e is System.Net.Sockets.SocketException)
{
System.Net.Sockets.SocketException se = (System.Net.Sockets.SocketException)e;
if (se.ErrorCode == 10004) // close methode as been called
{
return;
}
}
if (e is System.ObjectDisposedException)//throw by Receive (socket has been closed)
{
return;
}
if (e is System.NullReferenceException)//throw by Receive if we put socket=null after socket.close
{
return;
}
// send event_Socket_Server_Error
//if (this.event_Socket_Error!=null)
// this.event_Socket_Error(iph,new EventArgs_Exception(e));
this.send_socket_error_event(e);
}
}
