New submission from Andrew P. Lentvorski, Jr. <bs...@allcaps.org>:
On Linux, sockaddr_hci is:
struct sockaddr_hci {
sa_family_t hci_family;
unsigned short hci_dev;
unsigned short hci_channel;
};
Unfortunately, it seems like python does not allow any way to initialize
hci_channel, so you can't use a user channel socket (hci_channel == 0) or a
monitor channel. There is probably a larger discussion of how to enable people
to use a new field that appears in a structure like this, but that's above my
pay grade ...
Even worse, this appears to have been known for a while (since 2013 at least!
by Chromium), but while people complained, nobody actually took the time to
file it upstream with Python.
So, I'm filing it upstream. Hopefully this is easy to fix by someone who knows
what's up.
Thanks.
See:
https://chromium.googlesource.com/chromiumos/platform/btsocket/+/factory-4455.B
https://github.com/w3h/isf/blob/master/lib/thirdparty/scapy/layers/bluetooth.py
class BluetoothUserSocket(SuperSocket):
desc = "read/write H4 over a Bluetooth user channel"
def __init__(self, adapter=0):
# s = socket.socket(socket.AF_BLUETOOTH, socket.SOCK_RAW,
socket.BTPROTO_HCI)
# s.bind((0,1))
# yeah, if only
# thanks to Python's weak ass socket and bind implementations, we have
# to call down into libc with ctypes
sockaddr_hcip = POINTER(sockaddr_hci)
cdll.LoadLibrary("libc.so.6")
libc = CDLL("libc.so.6")
socket_c = libc.socket
socket_c.argtypes = (c_int, c_int, c_int);
socket_c.restype = c_int
bind = libc.bind
bind.argtypes = (c_int, POINTER(sockaddr_hci), c_int)
bind.restype = c_int
########
## actual code
s = socket_c(31, 3, 1) # (AF_BLUETOOTH, SOCK_RAW, HCI_CHANNEL_USER)
if s < 0:
raise BluetoothSocketError("Unable to open PF_BLUETOOTH socket")
sa = sockaddr_hci()
sa.sin_family = 31 # AF_BLUETOOTH
sa.hci_dev = adapter # adapter index
sa.hci_channel = 1 # HCI_USER_CHANNEL
r = bind(s, sockaddr_hcip(sa), sizeof(sa))
----------
components: Library (Lib)
messages: 336743
nosy: bsder
priority: normal
severity: normal
status: open
title: Python cannot access hci_channel field in sockaddr_hci
versions: Python 2.7, Python 3.4, Python 3.5, Python 3.6, Python 3.7, Python 3.8
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36132>
_______________________________________
_______________________________________________
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
