[issue36132] Python cannot access hci_channel field in sockaddr_hci

[Jeffrey Kintscher]

Change by Jeffrey Kintscher :


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nosy: +Jeffrey.Kintscher

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[issue36132] Python cannot access hci_channel field in sockaddr_hci

[Barry Byford]

Barry Byford  added the comment:

I was looking to control Bluetooth on Linux machines using the BlueZ Management 
API available at:
https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/doc/mgmt-api.txt

The Bluetooth management sockets can be created by setting the hci_channel
member of struct sockaddr_hci to HCI_CHANNEL_CONTROL (3) when creating a
raw HCI socket.

The resolution of this issue would enable access to that API.

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[issue36132] Python cannot access hci_channel field in sockaddr_hci

[Andrew P. Lentvorski, Jr.]

Andrew P. Lentvorski, Jr.  added the comment:

It's up to you how you folks want to deal with this, but classifying it as a 
"bug" for those versions in bugfix is likely acceptable.

You already have to call bind with a tuple, so as long as it is *optional* to 
add an extra field to that tuple (and I can't imagine that any fix would not do 
that as it would break existing code), it's not going to break things.

However, since nobody seems to have felt the need to file this, fixing this in 
3.8 is probably just fine.

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[issue36132] Python cannot access hci_channel field in sockaddr_hci

[Stéphane Wirtel]

Stéphane Wirtel  added the comment:

Thank you,

I have changed the related versions of Python to 3.8 because it's a new feature 
and the other releases are in security mode or bugfix mode.

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nosy: +matrixise
versions:  -Python 2.7, Python 3.4, Python 3.5, Python 3.6, Python 3.7

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[issue36132] Python cannot access hci_channel field in sockaddr_hci

[Andrew P. Lentvorski, Jr.]

New submission from Andrew P. Lentvorski, Jr. :

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

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