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#
# Copyright 2017 Ettus Research (National Instruments)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
"""
Code to run the discovery port
"""
from __future__ import print_function
from multiprocessing import Process
import socket
from builtins import bytes
from six import iteritems
from usrp_mpm.mpmtypes import MPM_DISCOVERY_PORT
from .mpmlog import get_main_logger
RESPONSE_PREAMBLE = "USRP-MPM"
RESPONSE_SEP = ";"
RESPONSE_CLAIMED_KEY = "claimed"
def spawn_discovery_process(device_info, shared_state, discovery_addr):
"""
Returns a process that contains the device discovery.
Arguments:
device_info -- A dictionary of type string -> string. All of these items
will be included in the response string.
shared_state -- Shared state of device (is it claimed, etc.). Is a
SharedState() object.
discovery_addr -- Discovery will listen on this address(es)
"""
proc = Process(
target=_discovery_process,
args=(device_info, shared_state, discovery_addr)
)
proc.start()
return proc
def _discovery_process(device_info, state, discovery_addr):
"""
The actual process for device discovery. Is spawned by
spawn_discovery_process().
"""
def create_response_string():
" Generate the string that gets sent back to the requester. "
return RESPONSE_SEP.join(
[RESPONSE_PREAMBLE] + \
["{k}={v}".format(k=k, v=v) for k, v in iteritems(device_info)] + \
["{k}={v}".format(k=RESPONSE_CLAIMED_KEY, v=state.claim_status.value)]
)
log = get_main_logger().getChild('discovery')
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
# FIXME really, we should only bind to the subnet but I haven't gotten that
# working yet
sock.bind((("0.0.0.0", MPM_DISCOVERY_PORT)))
send_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
# TODO yeah I know that's not how you do this
discovery_addr_prefix = discovery_addr.replace('.255', '')
if discovery_addr == '0.0.0.0':
discovery_addr_prefix = ''
try:
while True:
data, sender = sock.recvfrom(8000)
log.info("Got poked by: %s", sender[0])
# TODO this is still part of the awful subnet identification
if not sender[0].startswith(discovery_addr_prefix):
continue
if data.strip(b"\0") == b"MPM-DISC":
log.info("Sending discovery response to %s port: %d",
sender[0], sender[1])
send_data = bytes(create_response_string(), 'ascii')
log.info(send_data)
send_sock.sendto(send_data, sender)
elif data.strip(b"\0").startswith(b"MPM-ECHO"):
log.info("Received echo request from {sender}".format(
sender=sender[0])
)
send_data = data
send_sock.sendto(send_data, sender)
except Exception as err:
log.error("Error: %s", err)
log.error("Error type: %s", type(err))
sock.close()
send_sock.close()
exit(1)
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