mirror of
https://github.com/saymrwulf/uhd.git
synced 2026-05-14 20:58:09 +00:00
159c21b75c
The receiving socket can be used to send responses. This allows setting firewall rules for USRP detection.
97 lines
3.4 KiB
Python
97 lines
3.4 KiB
Python
#
|
|
# Copyright 2017 Ettus Research, a National Instruments Company
|
|
#
|
|
# SPDX-License-Identifier: GPL-3.0-or-later
|
|
#
|
|
"""
|
|
Code to run the discovery port
|
|
"""
|
|
|
|
from multiprocessing import Process
|
|
import socket
|
|
from usrp_mpm.mpmtypes import MPM_DISCOVERY_PORT
|
|
from usrp_mpm.mpmlog import get_main_logger
|
|
from usrp_mpm.mpmutils import to_binary_str
|
|
|
|
RESPONSE_PREAMBLE = b"USRP-MPM"
|
|
RESPONSE_SEP = b";"
|
|
RESPONSE_CLAIMED_KEY = b"claimed"
|
|
# A buffer size large enough to capture any UDP packet we receive on the
|
|
# discovery socket
|
|
MAX_SOCK_BUFSIZ = 9000
|
|
# For setsockopt
|
|
IP_MTU_DISCOVER = 10
|
|
IP_PMTUDISC_DO = 2
|
|
|
|
def spawn_discovery_process(shared_state, discovery_addr):
|
|
"""
|
|
Returns a process that contains the device discovery.
|
|
|
|
Arguments:
|
|
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=(shared_state, discovery_addr)
|
|
)
|
|
proc.start()
|
|
return proc
|
|
|
|
|
|
def _discovery_process(state, discovery_addr):
|
|
"""
|
|
The actual process for device discovery. Is spawned by
|
|
spawn_discovery_process().
|
|
"""
|
|
log = get_main_logger().getChild('discovery')
|
|
def create_response_string(state):
|
|
" Generate the string that gets sent back to the requester. "
|
|
return RESPONSE_SEP.join(
|
|
[RESPONSE_PREAMBLE] + \
|
|
[b"type="+state.dev_type.value] + \
|
|
[b"product="+state.dev_product.value] + \
|
|
[b"serial="+state.dev_serial.value] + \
|
|
[b"name="+state.dev_name.value] + \
|
|
[b"fpga="+state.dev_fpga_type.value] + \
|
|
[RESPONSE_CLAIMED_KEY+to_binary_str("={}".format(state.claim_status.value))]
|
|
)
|
|
|
|
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)))
|
|
sock.setsockopt(socket.IPPROTO_IP, IP_MTU_DISCOVER, IP_PMTUDISC_DO)
|
|
|
|
# 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(MAX_SOCK_BUFSIZ)
|
|
log.debug("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.debug("Sending discovery response to %s port: %d",
|
|
sender[0], sender[1])
|
|
resp_str = create_response_string(state)
|
|
send_data = resp_str
|
|
log.trace("Return data: %s", send_data)
|
|
sock.sendto(send_data, sender)
|
|
elif data.strip(b"\0").startswith(b"MPM-ECHO"):
|
|
log.debug("Received echo request from {sender}"
|
|
.format(sender=sender[0]))
|
|
send_data = data
|
|
try:
|
|
sock.sendto(send_data, sender)
|
|
except OSError as ex:
|
|
log.warning("ECHO send error: %s", str(ex))
|
|
except Exception as err:
|
|
log.error("Unexpected error: `%s' Type: `%s'", str(err), type(err))
|
|
sock.close()
|
|
exit(1)
|