Re: [Patch/Workaround?] pcap-usb-linux.c

["Tyson Key" <tyson.key () gmail com>]

Hi Jean-Louis, does libpcap compile with the supplied patch for you?
It applied cleanly here, although I can't complete the ./configure phase
(the error produced is below):
./pcap-usb-linux.c: In function 'usb_read_linux_mmap':
./pcap-usb-linux.c:708: error: 'clen' undeclared (first use in this
function)
./pcap-usb-linux.c:708: error: (Each undeclared identifier is reported only
once
./pcap-usb-linux.c:708: error: for each function it appears in.)
make: *** [pcap-usb-linux.o] Error 1

Thanks.

On Thu, Oct 30, 2008 at 11:48 AM, Jean-Louis <jelot-tcpdump () jelot it> wrote:

> Jean-Louis ha scritto:
>
> > Jean-Louis ha scritto:
> > > > > > today I have found some bug on pcap-usb-linux.c
> > > > > > > now i can try to tell you which are
> > in accordance with usbmon.txt in "mmap mode" the data is at
> >
> > &mmap_area[vec[i]] + 64;
> >
> > rather than
> >
> > &mmap_area[vec[i]] + 48;
> >
> > with mmap ther'is 16Byte filled with 0 first to the real data...
> >
> > so if i.e. I have caplen = 18Byte, in file.pcap I have 16Byte with garbage
> > (0x00) and only 2Byte with real data other 16Byte of real data is lost.
> >
> > the mmap mode is *default* with kernel >= 2.6.25-rc8-mm1
> >
> > I'm newbie with libpcap and I don't know how I can fix that without
> > degrading performance
>
> I have patched this bug, but seems to be workaround-ish
>
> so now pcap file is ok
>
> -
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