GeezerVison

Add README / prepare for Git & Github migration

errno set by pcap_open_live(3) (typically EPERM or ENXIO) was not
checked, eventually causing a segmentation violation at
pcap_get_selectable_fd():

    $ python3 -c 'from scapy.all import *; conf.use_pcap = True; sendp("", iface="nonexist0")'
    fish: “python3 -c 'from scapy.all impo…” terminated by signal SIGSEGV (Address boundary error)

because pcap_get_selectable_fd(3) refered to NULL:

    (gdb) bt
    #0  pcap_get_selectable_fd (p=0x0) at ./pcap.c:1419
    secdev#1  0x00007f963a72781e in ffi_call_unix64 () from /lib/x86_64-linux-gnu/libffi.so.6
    secdev#2  0x00007f963a7271ef in ffi_call () from /lib/x86_64-linux-gnu/libffi.so.6
    secdev#3  0x00007f963b17cf49 in _call_function_pointer (flags=flags@entry=4353, pProc=pProc@entry=0x7f96382d1300 <pcap_get_selectable_fd>, avalues=0x7ffd96028bd0,
        atypes=<optimized out>, restype=<optimized out>, resmem=resmem@entry=0x7ffd96028be0, argcount=1) at ./Modules/_ctypes/callproc.c:827
    secdev#4  0x00007f963b17d965 in _ctypes_callproc (pProc=pProc@entry=0x7f96382d1300 <pcap_get_selectable_fd>, argtuple=argtuple@entry=0x7f963b263608, flags=4353,
        argtypes=argtypes@entry=0x7f9638360d58, restype=restype@entry=0x18d7628, checker=checker@entry=0x0) at ./Modules/_ctypes/callproc.c:1184
    secdev#5  0x00007f963b176401 in PyCFuncPtr_call (self=0x7f963836bcf0, inargs=<optimized out>, kwds=<optimized out>) at ./Modules/_ctypes/_ctypes.c:3969
    secdev#6  0x000000000043730f in ?? ()
    secdev#7  0x00007f96382823b8 in ?? ()
    secdev#8  0x0000000000000000 in ?? ()

    (gdb) l
    1414
    1415	#if !defined(_WIN32) && !defined(MSDOS)
    1416	int
    1417	pcap_get_selectable_fd(pcap_t *p)
    1418	{
    1419		return (p->selectable_fd);
    1420	}
    1421	#endif
    1422
    1423	void

    (gdb) p p
    $1 = (pcap_t *) 0x0

Pull

* Add support for S1G beacon to the dot11 layer. (#2)

 - Includes unit test parsing and confirming an S1G beacon
 - Includes support for the new Frame Control format for type=3,
   subtype=1 (S1G beacon)
 - Includes changes to support addressing used in S1G beacon.

All dot11 unit tests pass with this change.

* More unit test changes to trigger workflows (#3)

* Add support for S1G beacon to the dot11 layer.
 - Includes unit test parsing and confirming an S1G beacon
 - Includes support for the new Frame Control format for type=3,
   subtype=1 (S1G beacon)
 - Includes changes to support addressing used in S1G beacon.

All dot11 unit tests pass with this change.

* Update S1G beacon parsing based on code review. (#4)

* Fix review comments from @p-l-:
 - Use set for 'type in' checks for extension frame type 3, subtype 1
   (S1G beacon).

* Update to FCfield to split into three parts for type 3, subtype 1 (S1G
beacon frame control field). This allows use of BitField for the 'bw',
and FlagsField for the remaining bits.

- Add log_isotp to re-exported symbols list (Finding #2)
- Correct ISOTPNativeSocket import behavior description: separate
  flag-setting (conditional) from import (unconditional on Linux) (Finding #4)
- Add Python script for extended addressing threshold test (Finding #3)
- Add missing CF1 and last CF print statements to 5000-byte script
  to match runtime output (Finding #1)
- Add self.pieces = list() to Bucket class excerpt (Finding #5)