[Winpcap-users] Change to pcap_dump_open

Gianluca Varenni Gianluca.Varenni at riverbed.com
Tue Feb 12 13:51:02 PST 2013

For pcap_dump_fopen, the only trick (that I know of) to make it work is the same one used by pcap_fopen_offline i.e. using a macro and an additional sort-of-hidden function exported by the DLL to overcome the FILE limitation on windows.


-----Original Message-----
From: winpcap-users-bounces at winpcap.org [mailto:winpcap-users-bounces at winpcap.org] On Behalf Of Guy Harris
Sent: Tuesday, February 12, 2013 12:40 PM
To: winpcap-users at winpcap.org
Subject: Re: [Winpcap-users] Change to pcap_dump_open

On Feb 12, 2013, at 5:47 AM, Clemens Gruber <clemens.gruber at pqgruber.com> wrote:

> (If pcap_dump_fopen had worked, I would have opened the handle myself 
> with fsopen before giving it to WinPcap, but pcap_dump_fopen is not 
> exported by the library.)

If you want pcap_dump_fopen() to work on Windows, you'll have to yell at Microsoft, and get them to make the ABI of the C library invariant between compiler releases, so that, for example, even if a given program is built with one version of Visual C and WinPcap is built with another version, the format of the "FILE" structure is the same in the program and in WinPcap.

> Also, would be
> nice if you could create a Github repository for the community. There 
> we could simplify the process of sending in patches via pull requests 
> and the issue tracker.

WinPcap is a port of libpcap, so the code in the libpcap source directory isn't maintained independently; there's a  GitHub repository for libpcap:


Confusingly, it has an issue tracker, but there's also a SourceForge issue tracker for it.  I'll ask Michael Richardson whether we should move to using the GitHub tracker or disable that tracker and send people to SourceForge.

Changes to libpcap won't necessarily immediately show up in a WinPcap release (or even a libpcap release).  I need to do some infrastructural work to libpcap to make it easier to maintain WinPcap.
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