def frame_rcvd_raw(self, frame_bytes):
'''Callback for each received message.'''
# Sanity check packet length.
if len(frame_bytes) < 14:
logger.warning(self.port.lbl + ': Packet too short.')
return
if len(frame_bytes) > 1550:
logger.warning(self.port.lbl + ': Packet too long.')
return
# Update the received-data count.
with self.batch_lock:
self.rcvd_count += 1
self.batch_rxbytes += len(frame_bytes)
# Parse Ethernet frame into components.
assert len(frame_bytes) > 14
assert len(frame_bytes) < 1550
mac_dst = frame_bytes[0:6]
mac_src = frame_bytes[6:12]
etype = frame_bytes[12:14]
payload = frame_bytes[14:]
# Reject messages from our own source address.
# (Network drivers may echo broadcast packets.)
if (mac_src == self.port.mac):
return
# Reject messages that aren't for us.
if (mac_dst != self.MAC_BCAST) and (mac_dst != self.port.mac):
return
# Handle message based on Ethertype:
if (etype == self.ETYPE_BEAT):
if self.LOG_VERBOSE:
logger.info(self.port.lbl + ': Got heartbeat from ' +
ethernet_utils.mac2str(mac_src))
self.frame_rcvd_beat(mac_src, self._decode_string(payload))
elif (etype == self.ETYPE_CHAT):
if self.LOG_VERBOSE:
logger.info(self.port.lbl + ': Got chat from ' +
ethernet_utils.mac2str(mac_src))
self.frame_rcvd_chat(mac_src, self._decode_string(payload))
elif (etype == self.ETYPE_DATA):
if self.LOG_VERBOSE:
logger.info(self.port.lbl + ': Got data from ' +
ethernet_utils.mac2str(mac_src))
else:
[etype_int] = unpack('>H', etype)
logger.info(self.port.lbl +
': Unrecognized EtherType 0x%04X' % etype_int)
def connect(self, port_obj):
'''Connect to specified port object.'''
# Connect and start both worker threads.
self.port = port_obj
self._heartbeat_run = True
self._heartbeat_thread.start()
self._auto_data_thread.start()
self._auto_text_thread.start()
self.batch_timer.start(125) # 8 updates/sec
# Update and launch GUI.
self.setWindowTitle('Chat: ' + port_obj.lbl)
self.txt_macaddr.setText(ethernet_utils.mac2str(port_obj.mac))
self.txt_username.setText(port_obj.lbl)
self.username = port_obj.lbl
self.show()
def frame_rcvd_chat(self, mac_src, msg_str):
'''Received chat message, update displayed list.'''
# Inspect message contents.
if len(msg_str) == 0:
logger.error(self.port.lbl + ': Invalid chat message.')
return
if not msg_str.endswith('\n'):
msg_str += '\n'
# Format message (including sender information)
if mac_src in self.rcvd_macs.keys():
lbl_src = self.rcvd_macs[mac_src]
else:
lbl_src = ethernet_utils.mac2str(mac_src)
msg_txt = 'From ' + lbl_src + ':\n' + msg_str
# Queue this message for next GUI update.
with self.batch_lock:
self.batch_msgs.append(msg_txt)
def _format_address(self, mac_src, label=''):
if label:
return ethernet_utils.mac2str(mac_src) + ' (%s)' % label
else:
return ethernet_utils.mac2str(mac_src)
