Re: Zenmap Crashing and CPU Utilisation hangs at 50%

[Ray Middleton <ray.middleton () gmail com>]

Hi David,

Thanks for the help, I'll let you know how I get on.

Ray

On 17 January 2011 20:31, David Fifield <david () bamsoftware com> wrote:

> On Mon, Jan 17, 2011 at 02:11:11PM +0000, Ray Middleton wrote:
> > Hi David,
> >
> > Thanks for the response.
> >
> > No the problem does not happen when switching to the topology tab, I
> never
> > get that far with the scans.  It is just on the main results window.
> >
> > I've included the output.xml file and also an screenshot so you can see
> what
> > is happening from a graphical standpoint as well as the xml.
> >
> > I forgot to add in my initial email that this is on Windows 7 pro 64bit.
> > Once manually closing out the application after it becomes unresponsive
> the
> > windows error is "NMAP front end results viewer is not responding".
>
> I bet I know what's going on. I see that the output (the normal text
> output, not the XML) is pretty long. Zenmap's live display of Nmap
> output is really inefficient: it monitors the output file for any
> changes, and when it changes, it re-reads the entire file from the
> beginning, doing syntax highlighting and everything. When even one new
> line is appended, it starts all over again. It's O(n^2) in the size of
> the output.
>
> Clearly Zenmap should only read the new lines and remember what it has
> already done instead. I'll make a TODO note about this.
>
> I don't have a good workaround to suggest other than running the command
> in a terminal. (You can copy and paste the command line from Zenmap, add
> a -oX option to save the output, and then open the XML file in Zenmap
> later.) Another thing you might try is changing this setting to False in
> zenmap.conf:
>
> [output_highlight]
> enable_highlight = True
>
> I don't know how much the highlighting contributes to the inefficiency,
> but it might be enough to allow your scan to finish.
>
> David Fifield
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