Re: WinPcap setup issue in Nmap Windows installer

[jah <jah () zadkiel plus com>]

On 14/12/2007 14:36, LevelZero wrote:
> After retrying the whole issue (the NPF problem was easily solved by
> removing the Netmon driver found at my NIC), I've come to the conclusion
> that it's most likely a user error :)
>
> What I think happened is as follows: I start the nmap setup, alt-tab to
> PuTTY, see a popup in the background, alt-tab back to it, etc. Somewhere in
> this period, I must have alt-tabbed to the 4.02 installer before finishing
> the 4.01 deinstaller.
>
> The second time I tried all this, I had no problems at all with
> installing/deinstalling.
>
> So the only "problem" here would be the 3 open "setup" windows at the same
> time (nmap install, winpcap 4.02 install, winpcap 4.01 deinstall).
>
>   
> > We perhaps need to look at the nmap-winpcap installer again and only do
> > an upgrade if the previous version detected is an nmap-winpcap one thus
> > not executing a separate uninstaller.
> > If a different (eg a wireshark winpcap) install is found, we should
> > perhaps prompt the user to uninstall it themselves and rerun nmap
> > installation again, aborting nmap-winpcap at that time.
> >     
> It actually manages to find and launch the uninstall for this winpcap
> without problems
>
> The only real difference I see is that the 4.02 installer from winpcap.org
> launches the uninstall and doesn't actually allow you to continue until the
> uninstall has finished, while the nmap-winpcap installer does allow this,
> since you can just click "next" in the installer even when the "welcome"
> screen of the uninstaller is still visible.
Yes, you're spot on there.  The installer has been written to wait for 
the uninstaller before continuing, but it doesn't.
The reason for this is that the uninstaller spawns another uninstaller 
(that does the actual uninstalling) and immediately exits whilst the 
sub-process does its thing.  As far as the nmap-winpcap installer is 
concerned, the uninstaller (parent) finishes practically immediately so 
the installation form is shown (even before the sub-uninstaller becomes 
visible) and installation is allowed to be started.  Crikey, I've made a 
mess of explaining that haven't I.  It's documented here: 
http://nsis.sourceforge.net/When_I_use_ExecWait_uninstaller.exe_it_doesn%27t_wait_for_the_uninstaller 
and the fix is trivial, but will need testing.

Thanks again.

jah

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