
=head1 NAME

extcap - Extcap grammar elements

=head1 DESCRIPTION

Grammar elements:

=over 4

=item arg (options)

argument for CLI calling

=item number

Reference # of argument for other values, display order

=item call

Literal argument to call (--call=...)

=item display

Displayed name

=item default

Default value, in proper form for type

=item range

Range of valid values for UI checking (min,max) in proper form

=item type

Argument type for UI filtering for raw, or UI type for selector:

    integer
    unsigned
    long (may include scientific / special notation)
    float
    selector (display selector table, all values as strings)
    boolean (display checkbox)
    radio (display group of radio buttons with provided values, all values as strings)

=item value (options)

    Values for argument selection
    arg     Argument # this value applies to

=back

=head1 EXAMPLES

Exampl 1:

    arg {number=0}{call=channel}{display=Wi-Fi Channel}{type=integer}
    arg {number=1}{call=chanflags}{display=Channel Flags}{type=radio}
    arg {number=2}{call=interface}{display=Interface}{type=selector}
    value {arg=0}{range=1,11}
    value {arg=1}{value=ht40p}{display=HT40+}
    value {arg=1}{value=ht40m}{display=HT40-}
    value {arg=1}{value=ht20}{display=HT20}
    value {arg=2}{value=wlan0}{display=wlan0}

Example 2:

    arg {number=0}{call=usbdevice}{USB Device}{type=selector}
    value {arg=0}{call=/dev/sysfs/usb/foo/123}{display=Ubertooth One sn 1234}
    value {arg=0}{call=/dev/sysfs/usb/foo/456}{display=Ubertooth One sn 8901}

Example 3:

    arg {number=0}{call=usbdevice}{USB Device}{type=selector}
    flag {failure=Permission denied opening Ubertooth device}

=head1 Security awareness

=over 4

=item - Users running wireshark as root, we can't save you

=item - Dumpcap retains suid/setgid and group+x permissions to allow users in wireshark group only

=item - Third-party capture programs run w/ whatever privs they're installed with

=item - If an attacker can write to a system binary directory, we're game over anyhow

=item - Don't let wireshark be told to look for capture binaries somewhere else?

=back

=head1 SEE ALSO

wireshark(1), tshark(1), dumpcap(1), androiddump(1)

=head1 NOTES

B<Extcap> is feature of B<Wireshark>.  The latest version
of B<Wireshark> can be found at L<https://www.wireshark.org>.

HTML versions of the Wireshark project man pages are available at:
L<https://www.wireshark.org/docs/man-pages>.