/usr/share/pyshared/bluetooth/bluez.py is in python-bluez 0.18-1build2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import struct
import binascii
from btcommon import *
import _bluetooth as _bt
import array
import fcntl
_constants = [ 'HCI', 'RFCOMM', 'L2CAP', 'SCO', 'SOL_L2CAP', 'SOL_RFCOMM',\
'L2CAP_OPTIONS' ]
for _c in _constants: exec "%s = _bt.%s" % (_c, _c)
del _constants
# ============== SDP service registration and unregistration ============
def discover_devices (duration=8, flush_cache=True, lookup_names=False):
sock = _gethcisock ()
try:
results = _bt.hci_inquiry (sock, duration=duration, flush_cache=True)
except _bt.error:
sock.close ()
raise BluetoothError ("error communicating with local "
"bluetooth adapter")
if lookup_names:
pairs = []
for addr in results:
timeoutms = int (10 * 1000)
try:
name = _bt.hci_read_remote_name (sock, addr, timeoutms)
except _bt.error, e:
# name lookup failed. either a timeout, or I/O error
continue
pairs.append ((addr, name))
sock.close ()
return pairs
else:
sock.close ()
return results
def lookup_name (address, timeout=10):
if not is_valid_address (address):
raise BluetoothError ("%s is not a valid Bluetooth address" % address)
sock = _gethcisock ()
timeoutms = int (timeout * 1000)
try:
name = _bt.hci_read_remote_name (sock, address, timeoutms)
except _bt.error, e:
# name lookup failed. either a timeout, or I/O error
name = None
sock.close ()
return name
def set_packet_timeout (address, timeout):
"""
Adjusts the ACL flush timeout for the ACL connection to the specified
device. This means that all L2CAP and RFCOMM data being sent to that
device will be dropped if not acknowledged in timeout milliseconds (maximum
1280). A timeout of 0 means to never drop packets.
Since this affects all Bluetooth connections to that device, and not just
those initiated by this process or PyBluez, a call to this method requires
superuser privileges.
You must have an active connection to the specified device before invoking
this method
"""
n = round (timeout / 0.625)
_write_flush_timeout (address, n)
def set_l2cap_mtu (sock, mtu):
"""set_l2cap_mtu (sock, mtu)
Adjusts the MTU for the specified L2CAP socket. This method needs to be
invoked on both sides of the connection for it to work! The default mtu
that all L2CAP connections start with is 672 bytes.
mtu must be between 48 and 65535, inclusive.
"""
s = sock.getsockopt (SOL_L2CAP, L2CAP_OPTIONS, 7)
# XXX should these be "<HHHB"?
o,i,f,m = struct.unpack ("HHHB", s)
s = struct.pack ("HHHB", mtu, mtu, f, m)
sock.setsockopt (SOL_L2CAP, L2CAP_OPTIONS, s)
def _get_available_port (protocol):
"""
deprecated. bind to PORT_ANY instead.
"""
if protocol == RFCOMM:
for channel in range (1,31):
s = BluetoothSocket (RFCOMM)
try:
s.bind ( ("", channel))
s.close ()
return channel
except:
s.close ()
elif protocol == L2CAP:
for psm in range (0x1001,0x8000,2):
s = BluetoothSocket (L2CAP)
try:
s.bind ( ("", psm))
s.close ()
return psm
except:
s.close ()
else:
raise ValueError ("protocol must either RFCOMM or L2CAP")
class BluetoothSocket:
__doc__ = _bt.btsocket.__doc__
def __init__ (self, proto = RFCOMM, _sock=None):
if _sock is None:
_sock = _bt.btsocket (proto)
self._sock = _sock
self._proto = proto
def dup (self):
"""dup () -> socket object
Return a new socket object connected to the same system resource."""
return BluetoothSocket (proto=self._proto, _sock=self._sock)
def accept (self):
try:
client, addr = self._sock.accept ()
except _bt.error, e:
raise BluetoothError (str (e))
newsock = BluetoothSocket (self._proto, client)
return (newsock, addr)
accept.__doc__ = _bt.btsocket.accept.__doc__
def bind (self, addrport):
if self._proto == RFCOMM or self._proto == L2CAP:
addr, port = addrport
if port == 0: addrport = (addr, _get_available_port (self._proto))
return self._sock.bind (addrport)
# import methods from the wraapped socket object
_s = ("""def %s (self, *args, **kwargs):
try:
return self._sock.%s (*args, **kwargs)
except _bt.error, e:
raise BluetoothError (str (e))
%s.__doc__ = _bt.btsocket.%s.__doc__\n""")
for _m in ( 'connect', 'connect_ex', 'close',
'fileno', 'getpeername', 'getsockname', 'gettimeout',
'getsockopt', 'listen', 'makefile', 'recv', 'recvfrom', 'sendall',
'send', 'sendto', 'setblocking', 'setsockopt', 'settimeout',
'shutdown'):
exec _s % (_m, _m, _m, _m)
del _m, _s
def advertise_service (sock, name, service_id = "", service_classes = [], \
profiles = [], provider = "", description = "", protocols = []):
if service_id != "" and not is_valid_uuid (service_id):
raise ValueError ("invalid UUID specified for service_id")
for uuid in service_classes:
if not is_valid_uuid (uuid):
raise ValueError ("invalid UUID specified in service_classes")
for uuid, version in profiles:
if not is_valid_uuid (uuid) or version < 0 or version > 0xFFFF:
raise ValueError ("Invalid Profile Descriptor")
for uuid in protocols:
if not is_valid_uuid (uuid):
raise ValueError ("invalid UUID specified in protocols")
try:
_bt.sdp_advertise_service (sock._sock, name, service_id, \
service_classes, profiles, provider, description, \
protocols)
except _bt.error, e:
raise BluetoothError (str (e))
def stop_advertising (sock):
try:
_bt.sdp_stop_advertising (sock._sock)
except _bt.error, e:
raise BluetoothError (str (e))
def find_service (name = None, uuid = None, address = None):
if not address:
devices = discover_devices ()
else:
devices = [ address ]
results = []
if uuid is not None and not is_valid_uuid (uuid):
raise ValueError ("invalid UUID")
try:
for addr in devices:
try:
s = _bt.SDPSession ()
s.connect (addr)
matches = []
if uuid is not None:
matches = s.search (uuid)
else:
matches = s.browse ()
except _bt.error:
continue
if name is not None:
matches = filter (lambda s: s.get ("name", "") == name, \
matches)
for m in matches:
m["host"] = addr
results.extend (matches)
except _bt.error, e:
raise BluetoothError (str (e))
return results
# ================ BlueZ internal methods ================
def _gethcisock (device_id = -1):
try:
sock = _bt.hci_open_dev (device_id)
except:
raise BluetoothError ("error accessing bluetooth device")
return sock
def _get_acl_conn_handle (hci_sock, addr):
hci_fd = hci_sock.fileno ()
reqstr = struct.pack ("6sB17s", _bt.str2ba (addr),
_bt.ACL_LINK, "\0" * 17)
request = array.array ("c", reqstr)
try:
fcntl.ioctl (hci_fd, _bt.HCIGETCONNINFO, request, 1)
except IOError, e:
raise BluetoothError ("There is no ACL connection to %s" % addr)
# XXX should this be "<8xH14x"?
handle = struct.unpack ("8xH14x", request.tostring ())[0]
return handle
def _write_flush_timeout (addr, timeout):
hci_sock = _bt.hci_open_dev ()
# get the ACL connection handle to the remote device
handle = _get_acl_conn_handle (hci_sock, addr)
# XXX should this be "<HH"
pkt = struct.pack ("HH", handle, _bt.htobs (timeout))
response = _bt.hci_send_req (hci_sock, _bt.OGF_HOST_CTL,
0x0028, _bt.EVT_CMD_COMPLETE, 3, pkt)
status = struct.unpack ("B", response[0])[0]
rhandle = struct.unpack ("H", response[1:3])[0]
assert rhandle == handle
assert status == 0
def _read_flush_timeout (addr):
hci_sock = _bt.hci_open_dev ()
# get the ACL connection handle to the remote device
handle = _get_acl_conn_handle (hci_sock, addr)
# XXX should this be "<H"?
pkt = struct.pack ("H", handle)
response = _bt.hci_send_req (hci_sock, _bt.OGF_HOST_CTL,
0x0027, _bt.EVT_CMD_COMPLETE, 5, pkt)
status = struct.unpack ("B", response[0])[0]
rhandle = struct.unpack ("H", response[1:3])[0]
assert rhandle == handle
assert status == 0
fto = struct.unpack ("H", response[3:5])[0]
return fto
# =============== DeviceDiscoverer ==================
class DeviceDiscoverer:
"""
Skeleton class for finer control of the device discovery process.
To implement asynchronous device discovery (e.g. if you want to do
something *as soon as* a device is discovered), subclass
DeviceDiscoverer and override device_discovered () and
inquiry_complete ()
"""
def __init__ (self, device_id=-1):
"""
__init__ (device_id=-1)
device_id - The ID of the Bluetooth adapter that will be used
for discovery.
"""
self.sock = None
self.is_inquiring = False
self.lookup_names = False
self.device_id = device_id
self.names_to_find = {}
self.names_found = {}
def find_devices (self, lookup_names=True,
duration=8,
flush_cache=True):
"""
find_devices (lookup_names=True, service_name=None,
duration=8, flush_cache=True)
Call this method to initiate the device discovery process
lookup_names - set to True if you want to lookup the user-friendly
names for each device found.
service_name - set to the name of a service you're looking for.
only devices with a service of this name will be
returned in device_discovered () NOT YET IMPLEMENTED
ADVANCED PARAMETERS: (don't change these unless you know what
you're doing)
duration - the number of 1.2 second units to spend searching for
bluetooth devices. If lookup_names is True, then the
inquiry process can take a lot longer.
flush_cache - return devices discovered in previous inquiries
"""
if self.is_inquiring:
raise BluetoothError ("Already inquiring!")
self.lookup_names = lookup_names
self.sock = _gethcisock (self.device_id)
flt = _bt.hci_filter_new ()
_bt.hci_filter_all_events (flt)
_bt.hci_filter_set_ptype (flt, _bt.HCI_EVENT_PKT)
try:
self.sock.setsockopt (_bt.SOL_HCI, _bt.HCI_FILTER, flt)
except:
raise BluetoothError ("problem with local bluetooth device.")
# send the inquiry command
max_responses = 255
cmd_pkt = struct.pack ("BBBBB", 0x33, 0x8b, 0x9e, \
duration, max_responses)
self.pre_inquiry ()
try:
_bt.hci_send_cmd (self.sock, _bt.OGF_LINK_CTL, \
_bt.OCF_INQUIRY, cmd_pkt)
except:
raise BluetoothError ("problem with local bluetooth device.")
self.is_inquiring = True
self.names_to_find = {}
self.names_found = {}
def cancel_inquiry (self):
"""
Call this method to cancel an inquiry in process. inquiry_complete
will still be called.
"""
self.names_to_find = {}
if self.is_inquiring:
try:
_bt.hci_send_cmd (self.sock, _bt.OGF_LINK_CTL, \
_bt.OCF_INQUIRY_CANCEL)
self.sock.close ()
self.sock = None
except:
raise BluetoothError ("error canceling inquiry")
self.is_inquiring = False
def process_inquiry (self):
"""
Repeatedly calls process_event () until the device inquiry has
completed.
"""
while self.is_inquiring or len (self.names_to_find) > 0:
self.process_event ()
def process_event (self):
"""
Waits for one event to happen, and proceses it. The event will be
either a device discovery, or an inquiry completion.
"""
self._process_hci_event ()
def _process_hci_event (self):
import socket
if self.sock is None: return
# voodoo magic!!!
pkt = self.sock.recv (255)
ptype, event, plen = struct.unpack ("BBB", pkt[:3])
pkt = pkt[3:]
if event == _bt.EVT_INQUIRY_RESULT:
nrsp = struct.unpack ("B", pkt[0])[0]
for i in range (nrsp):
addr = _bt.ba2str (pkt[1+6*i:1+6*i+6])
psrm = pkt[ 1+6*nrsp+i ]
pspm = pkt[ 1+7*nrsp+i ]
devclass_raw = struct.unpack ("BBB",
pkt[1+9*nrsp+3*i:1+9*nrsp+3*i+3])
devclass = (devclass_raw[2] << 16) | \
(devclass_raw[1] << 8) | \
devclass_raw[0]
clockoff = pkt[1+12*nrsp+2*i:1+12*nrsp+2*i+2]
self._device_discovered (addr, devclass,
psrm, pspm, clockoff)
elif event == _bt.EVT_INQUIRY_RESULT_WITH_RSSI:
nrsp = struct.unpack ("B", pkt[0])[0]
for i in range (nrsp):
addr = _bt.ba2str (pkt[1+6*i:1+6*i+6])
psrm = pkt[ 1+6*nrsp+i ]
pspm = pkt[ 1+7*nrsp+i ]
# devclass_raw = pkt[1+8*nrsp+3*i:1+8*nrsp+3*i+3]
# devclass = struct.unpack ("I", "%s\0" % devclass_raw)[0]
devclass_raw = struct.unpack ("BBB",
pkt[1+8*nrsp+3*i:1+8*nrsp+3*i+3])
devclass = (devclass_raw[2] << 16) | \
(devclass_raw[1] << 8) | \
devclass_raw[0]
clockoff = pkt[1+11*nrsp+2*i:1+11*nrsp+2*i+2]
rssi = struct.unpack ("b", pkt[1+13*nrsp+i])[0]
self._device_discovered (addr, devclass,
psrm, pspm, clockoff)
elif event == _bt.EVT_INQUIRY_COMPLETE:
self.is_inquiring = False
if len (self.names_to_find) == 0:
# print "inquiry complete (evt_inquiry_complete)"
self.sock.close ()
self.inquiry_complete ()
else:
self._send_next_name_req ()
elif event == _bt.EVT_CMD_STATUS:
# XXX shold this be "<BBH"
status, ncmd, opcode = struct.unpack ("BBH", pkt[:4])
if status != 0:
self.is_inquiring = False
self.sock.close ()
# print "inquiry complete (bad status 0x%X 0x%X 0x%X)" % \
# (status, ncmd, opcode)
self.names_to_find = {}
self.inquiry_complete ()
elif event == _bt.EVT_REMOTE_NAME_REQ_COMPLETE:
status = struct.unpack ("B", pkt[0])[0]
addr = _bt.ba2str (pkt[1:7])
if status == 0:
try:
name = pkt[7:].split ('\0')[0]
except IndexError:
name = ''
if addr in self.names_to_find:
device_class = self.names_to_find[addr][0]
self.device_discovered (addr, device_class, name)
del self.names_to_find[addr]
self.names_found[addr] = ( device_class, name)
else:
pass
else:
if addr in self.names_to_find: del self.names_to_find[addr]
# XXX should we do something when a name lookup fails?
# print "name req unsuccessful %s - %s" % (addr, status)
if len (self.names_to_find) == 0:
self.is_inquiring = False
self.sock.close ()
self.inquiry_complete ()
# print "inquiry complete (name req complete)"
else:
self._send_next_name_req ()
else:
pass
# print "unrecognized packet type 0x%02x" % ptype
def _device_discovered (self, address, device_class,
psrm, pspm, clockoff):
if self.lookup_names:
if address not in self.names_found and \
address not in self.names_to_find:
self.names_to_find[address] = \
(device_class, psrm, pspm, clockoff)
else:
self.device_discovered (address, device_class, None)
def _send_next_name_req (self):
assert len (self.names_to_find) > 0
address = self.names_to_find.keys ()[0]
device_class, psrm, pspm, clockoff = self.names_to_find[address]
bdaddr = _bt.str2ba (address)
cmd_pkt = "%s%s\0%s" % (bdaddr, psrm, clockoff)
try:
_bt.hci_send_cmd (self.sock, _bt.OGF_LINK_CTL, \
_bt.OCF_REMOTE_NAME_REQ, cmd_pkt)
except Exception, e:
raise BluetoothError ("error request name of %s - %s" %
(address, str (e)))
def fileno (self):
if not self.sock: return None
return self.sock.fileno ()
def pre_inquiry (self):
"""
Called just after find_devices is invoked, but just before the
inquiry is started.
This method exists to be overriden
"""
def device_discovered (self, address, device_class, name):
"""
Called when a bluetooth device is discovered.
address is the bluetooth address of the device
device_class is the Class of Device, as specified in [1]
passed in as a 3-byte string
name is the user-friendly name of the device if lookup_names was
set when the inquiry was started. otherwise None
This method exists to be overriden.
[1] https://www.bluetooth.org/foundry/assignnumb/document/baseband
"""
if name:
print "found: %s - %s (class 0x%X)" % \
(address, name, device_class)
else:
print "found: %s (class 0x%X)" % (address, device_class)
def inquiry_complete (self):
"""
Called when an inquiry started by find_devices has completed.
"""
print "inquiry complete"
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