[Ntop] GDC_out_pie(002) message

[Burton M. Strauss III]

Probably not. 

 

The GDC_out_pie chart errors are unique to 2.2 and represent problems with the underlying gdchart library.

 

The changes Luca made in 2.2.1 are a total rewrite of the graph.c routine - moving the minimal bits that ntop requires from gdchart into graph.c and then dumping gdchart.

 

The problems with gdchart are why he chose this (drastic) step.

 

If you read the 2.2 code in graph.c that calls GDC_out_pie:

 

  /* parent */

 

#ifdef GDC_WATCHDOG_DEBUG
  traceEvent(CONST_TRACE_INFO, "GDC_WATCHDOG_DEBUG: in parent, waiting for %d...\n", fork_result);
#endif

 

  wait_result = waitpid(fork_result, &status, 0);

 

  if (wait_result == (pid_t) -1) {
      traceEvent(CONST_TRACE_WARNING, "GDC_out_pie(002) - wait failed/interrupted (%d - %s)",
                 errno,
                 (errno == ECHILD ? "ECHILD" :
                  errno == EINVAL ? "EINVAL" :
                  errno == EINTR  ? "EINTR"  : "unrecognized code"));
  } else if (wait_result != fork_result) {
      traceEvent(CONST_TRACE_WARNING, "GDC_out_pie(003) - unexpected child termination");
  } else if (status) {
      traceEvent(CONST_TRACE_WARNING, "GDC_out_pie(004) - child abnormal termination");
  } else {
#ifdef GDC_WATCHDOG_DEBUG
      traceEvent(CONST_TRACE_INFO, "GDC_WATCHDOG_DEBUG: in parent, ran OK\n");
#endif
      return;
  }

 

and read up on man fork, you'll see that it's possible for a fork()ed child to start and die before the parent gets control, causing the waitpid to return less than optimal results.  I suppose you could try putting a sched_yield() into the child, but that only narrows the window, it doesn't eliminate it.

 

-----Burton

 

 

-----Original Message-----
From: Dominique Lalot [mailto:[EMAIL PROTECTED]
Sent: Tuesday, June 17, 2003 12:18 AM
To: Burton M. Strauss III
Subject: RE: [Ntop] ftp passive

A 17:55 16/06/2003 -0500, vous avez �crit :

Since ntop doesn't see the packets using netflow, there's no way to id
passive traffic.  Read the back traffic concerning the 2.2 ./configure
option --enable-netflowassumeftpdata.

Hello Burton,

Are you speaking about cisco netflow ?. I have nothing of that in my configuration here.
It seemed that there is no fix about GDC_out_pie in the 2.2.0 branch in CVS.
Is it possible to add it, so I can get something stable?.

Thanks

Dominique

-----Burton

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Dominique Lalot
Sent: Monday, June 16, 2003 7:36 AM
To: [EMAIL PROTECTED]
Subject: [Ntop] ftp passive


Hello,

May be it's a FAQ. I only get a few messages about it using a google search.
I have a pure FTP server on my network, and FTP is less than 20% of TCP
protocol. I guess that all the rest is FTP passive.

Is there something to do to activate the search of FTP passive connections?.

Thanks

Dominique

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