[Winpcap-users] pcap_findalldevs Hangs when calledinWindowsservice
Thomas O'Hare
Tom at RedTile.Com
Mon Aug 14 16:20:08 GMT 2006
Richard
If that is the case then my 2 cents says it's a security issue. XP has,
IMO, much worse security setup then server OS's.
But that all makes sense, XP & security.
Thanks,
~ Thomas O'Hare ~
President, RedTile, Inc. - DBA: RedTile Software
Web, Wireless, Network, Database & Systems Software
+1.407.295.9148 ; +49.8651.717950 ; http://www.RedTile.Com/
Operations Manager; Virtual FoxPro User Group
Tom at VFUG.Org ; http://www.VFUG.Org/
Richard Bellengere wrote:
> Hi.
>
> It seems to be either an XP thing or particular to my machine. I got it
> running on a Server2000 machine - First Time!
> I will try some other machines here in the office if I can get my hands
> on them.
>
> Regards
> RichardB
>
> ________________________________
>
> From: winpcap-users-bounces at winpcap.org
> [mailto:winpcap-users-bounces at winpcap.org] On Behalf Of Gianluca Varenni
> Sent: 11 August 2006 18:00
> To: winpcap-users at winpcap.org
> Subject: Re: [Winpcap-users] pcap_findalldevs Hangs when
> calledinWindowsservice
>
>
>
>
> ----- Original Message -----
> From: Richard Bellengere <mailto:RichardB at thoroughtec.com>
> To: winpcap-users at winpcap.org
> Sent: Friday, August 11, 2006 5:36 AM
> Subject: RE: [Winpcap-users] pcap_findalldevs Hangs when
> calledinWindowsservice
>
> Hi.
>
> Checked Visual Studio 2005 Express and WinPCap version 4.0.
> Checked Visual Studio 2003 C++ and WinPCap version 4.0.
> Checked program compiled as Multibyte Characters and Unicode
> Characters.
>
>
> This doesn't influence WinPcap.
>
>
> Checked program compiled linked to runtime libraries in
> multithreaded dll and static inclusion of multithreaded runtime
> libraries.
> I tried compiling the same code in to a windowed app (instead of
> console app) and running that as a service.
>
> All result in the same problem. pcap_findalldevs hangs.
>
> The documetation makes reference to pcap_findalldevs_ex, but I
> have not been able to find it in headers and compile, Am I missing
> something?
>
>
> If you want to use pcap_findalldevs_ex, just include pcap.h (do *NOT*
> include any other header), and have both WPCAP and HAVE_REMOTE defined
> as preprocessor directives. In any case pcap_findalldevs_ex is a wrapper
> against pcap_findalldevs, which in turn calls PacketGetAdapterNames,
> which is almost certainly the API that hangs. So it does not help.
>
>
> Is it time to start loading the debug version of the packet.dll
> to get more information?
>
>
> That would be very helpful. Please use WinPcap 4.0alpha1, as this
> version produces a much more verbose trace.
>
> Have a nice day
> GV
>
>
> Regards
> RichardB
>
> ________________________________
>
> From: winpcap-users-bounces at winpcap.org
> [mailto:winpcap-users-bounces at winpcap.org] On Behalf Of Gianluca Varenni
> Sent: 10 August 2006 18:15
> To: winpcap-users at winpcap.org
> Subject: Re: [Winpcap-users] pcap_findalldevs Hangs when
> calledinWindowsservice
>
>
> Richard,
>
> I'll try to create a small test application to reproduce the
> problem. One thing came to my mind: have you changed the compilation
> properties of your application so have it thread safe?
>
> Under VC2003, it's in the project properties, under C/C++ ->
> Code generation -> Runtime Library. Be sure to set it to set it to
> multithreaded (or multithreaded DLL, depending on the flavor of CRT that
> you want to use).
>
> have a nice day
> GV
>
>
>
>
> ----- Original Message -----
> From: Richard Bellengere
> <mailto:RichardB at thoroughtec.com>
> To: winpcap-users at winpcap.org
> Sent: Thursday, August 10, 2006 1:06 AM
> Subject: RE: [Winpcap-users] pcap_findalldevs Hangs when
> called inWindowsservice
>
> Hi
>
> Sorry - my sample app depends on way too much for me to
> quickly zip it up and post it.
>
> I'm using 3.1. I will try 4.0 and let you know what
> happens.
> I'm using Visual C++ 2005 Express. I will try Visual
> Studio 2003 for size too.
>
> Some more information that may be of interest.
> My service is compiled as a console application. When
> running it (in debug mode) as a console app and not a service,
> pcap_findalldevs is successful only if run from the main thread.
> pcap_loop can be run from the new thread no problem. When I do the same
> thing in a windowed application I can call pcap_findalldevs from the new
> thread without issue.
>
> It really smacks of a thread permissions issue. I've
> tried making sure the apps and services are running as admin (because of
> npf and nm), but that does not seem to help. Right now I'm trying to
> find out what the difference is between a console thread and a Window
> thread.
>
> Regards
> RichardB
>
> ________________________________
>
> From: winpcap-users-bounces at winpcap.org
> [mailto:winpcap-users-bounces at winpcap.org] On Behalf Of Gianluca Varenni
> Sent: 09 August 2006 19:15
> To: winpcap-users at winpcap.org
> Subject: Re: [Winpcap-users] pcap_findalldevs Hangs when
> called in Windowsservice
>
>
> Richard,
>
> can you please provide a sample app showing the problem?
>
> Which version of WinPcap are you using? WinPcap 3.1 has
> a known bug that affects services based on WinPcap, bug that has been
> fixed in the newer versions of WinPcap like 4.0alpha1.
>
> Have a nice day
> GV
>
> ----- Original Message -----
> From: Richard Bellengere
> <mailto:RichardB at thoroughtec.com>
> To: winpcap-users at winpcap.org
> Sent: Tuesday, August 08, 2006 5:44 AM
> Subject: [Winpcap-users] pcap_findalldevs Hangs
> when called in Windows service
>
> Hi.
>
> I'm getting exactly the same thing. Did you
> ever get a solution to this problem?
>
> It seems to have something to do with
> findalldevs being called from a new thread and not the process's main
> thread.
>
> Thanks
> RichardB
>
>
> ________________________________
>
>
>
>
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