Re: building libpcap without usb support

[Guy Harris <guy () alum mit edu>]

On Jul 5, 2014, at 5:39 PM, Guy Harris <guy () alum mit edu> wrote:

> On Jul 5, 2014, at 5:02 PM, Michael Richardson <mcr () sandelman ca> wrote:
>
> > It appears that on Linux there is no way to build libpcap without USB
> > support.  There is no --disable-usb that I can see in ./configure, and
> > it appears that if you don't have the right headers, you just fail.
> > (Or did I miss something?)
>
> The configure script should probably check for the necessary headers, and build the USB printer only if they're 
> present.

s/printer/pcap module/ - I was thinking tcpdump, not libpcap.

pcap-usb-linux.c includes what should be standard Linux headers, plus including some headers under #ifdefs set by 
configure.

However, it assumes that, for example, struct usbdevfs_ctrltransfer will always be defined, even if 
<linux/usbdevice_fs.h> doesn't exist.  That probably needs to be fixed; I'll look at that.

For other structures and #defines, pcap-usb-linux.c has its own versions; this makes me a little nervous - I'll have to 
see whether the authors of the code had a reason why 1) they had to do that and 2) it was safe to do that.
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