usbpcap no longer recognized in 2.9

[Shai Shapira <noforu () gmail com>]

Hey all
I noticed today I couldn't get Wireshark to show the usbpcap interface in
the latest master build.
I'm quite positive this is because of the new addition to the way extcaps
are interacted with, specificly (from README.extcap):
"
Since Wireshark 2.9 this call is extended with --extcap-version x.x, which
will
allways represent the calling wireshark's version information. This can be
used
to change behavior depending on the wireshark version in question
"
I tried calling usbpcap's executable (USBPcapCMD.exe) with the new
--extcap-version
option and it returns this output:
"
USBPcapCMD.exe: --extcap-version: unknown option
"

While this is something that should be solved at usbpcap side, since
Wireshark ships with the the latest usbpcap version (which doesn't support
this option) in the installer, this might confuse the users.
My suggestion is either
1. Allow backward compatibility (calling the all extcaps which do not
response 'nicely' to "--extcap-interfaces --extcap-version=2.9" with the
old "--extcap-interfaces" args list)
2. Remove the usbpcap from the (NSIS) installer until a version which
supports this option exists
What do you guys think?

Side note 1:
I have already opened an issue on usbpcap's GitHub page:
https://github.com/desowin/usbpcap/issues/51
Side note 2:
There seems to be a misalignment between wireshark and README.extcap. The
README says the new options' syntax is
"--extcap-version x.x"
and even provides an example but in my tests wireshark uses
"--extcap-version*=*x.x". I'm assuming one of them is a mistake and should
be fixed.

Cheers

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