def connect(redis_conn, key):
"""
Establishes connection with a node to:
1) Send version message
2) Receive version and verack message
3) Send getaddr message
4) Receive addr message containing list of peering nodes
Stores state and height for node in Redis.
"""
handshake_msgs = []
addr_msgs = []
redis_conn.hset(key, 'state', "") # Set Redis hash for a new node
(address, port, services) = key[5:].split("-", 2)
services = int(services)
height = redis_conn.get('height')
if height:
height = int(height)
proxy = None
if address.endswith(".onion"):
proxy = SETTINGS['tor_proxy']
conn = Connection((address, int(port)), (SETTINGS['source_address'], 0),
socket_timeout=SETTINGS['socket_timeout'],
proxy=proxy,
protocol_version=SETTINGS['protocol_version'],
to_services=services,
from_services=SETTINGS['services'],
user_agent=SETTINGS['user_agent'],
height=height,
relay=SETTINGS['relay'])
try:
logging.debug("Connecting to %s", conn.to_addr)
conn.open()
handshake_msgs = conn.handshake()
addr_msgs = conn.getaddr()
except (ProtocolError, ConnectionError, socket.error) as err:
logging.debug("%s: %s", conn.to_addr, err)
finally:
conn.close()
gevent.sleep(0.3)
redis_pipe = redis_conn.pipeline()
if len(handshake_msgs) > 0:
version_msg = handshake_msgs[0]
from_services = version_msg.get('services', 0)
if from_services != services:
logging.debug("%s Expected %d, got %d for services", conn.to_addr,
services, from_services)
key = "node:{}-{}-{}".format(address, port, from_services)
height_key = "height:{}-{}-{}".format(address, port, from_services)
redis_pipe.setex(height_key, SETTINGS['max_age'],
version_msg.get('height', 0))
now = int(time.time())
peers = enumerate_node(redis_pipe, addr_msgs, now)
logging.debug("%s Peers: %d", conn.to_addr, peers)
redis_pipe.hset(key, 'state', "up")
redis_pipe.execute()
def connect(redis_conn, key):
"""
Establishes connection with a node to:
1) Send version message
2) Receive version and verack message
3) Send getaddr message
4) Receive addr message containing list of peering nodes
Stores state and height for node in Redis.
"""
handshake_msgs = []
addr_msgs = []
redis_conn.hset(key, 'state', "") # Set Redis hash for a new node
(address, port, services) = key[5:].split("-", 2)
height = redis_conn.get('height')
if height:
height = int(height)
conn = Connection((address, int(port)),
(SETTINGS['source_address'], 0),
socket_timeout=SETTINGS['socket_timeout'],
proxy=SETTINGS['proxy'],
protocol_version=SETTINGS['protocol_version'],
to_services=int(services),
from_services=SETTINGS['services'],
user_agent=SETTINGS['user_agent'],
height=height,
relay=SETTINGS['relay'])
try:
logging.debug("Connecting to %s", conn.to_addr)
conn.open()
handshake_msgs = conn.handshake()
addr_msgs = conn.getaddr()
except (ProtocolError, ConnectionError, socket.error) as err:
logging.debug("%s: %s", conn.to_addr, err)
finally:
conn.close()
gevent.sleep(0.3)
redis_pipe = redis_conn.pipeline()
if len(handshake_msgs) > 0:
height_key = "height:{}-{}-{}".format(address, port, services)
redis_pipe.setex(height_key, SETTINGS['max_age'],
handshake_msgs[0].get('height', 0))
now = int(time.time())
peers = enumerate_node(redis_pipe, addr_msgs, now)
logging.debug("%s Peers: %d", conn.to_addr, peers)
redis_pipe.hset(key, 'state', "up")
redis_pipe.execute()
def _getaddr(self, node, port):
"""
Establishes connection with a node to:
1) Send version message
2) Receive version and verack message
3) Send getaddr message
4) Receive addr message containing list of adjacent nodes
"""
to_addr = (node, port)
conn = Connection(to_addr,
socket_timeout=SETTINGS['socket_timeout'],
user_agent=SETTINGS['user_agent'],
start_height=SETTINGS['start_height'])
error = ""
handshake_msgs = []
addr_msg = {}
try:
conn.open()
handshake_msgs = conn.handshake()
addr_msg = conn.getaddr()
except (ProtocolError, socket.error) as err:
error = str(err)
logging.debug("{}: {} dropped".format(err, to_addr))
finally:
conn.close()
nodes = None
degree = 0
# Record version information for the remote node
if len(handshake_msgs) > 0:
if not self.database.has_node(node, table="nodes_version"):
self.database.add_node_version(node, handshake_msgs[0])
nodes = []
if 'addr_list' in addr_msg:
nodes = self.get_nodes_from_addr_list(addr_msg['addr_list'])
degree = len(nodes)
# Cache the result in database for reuse in subsequent getaddr()
# calls for the same node.
self.database.add_node_getaddr(node, nodes, error, degree)
return nodes
def _getaddr(self, node, port):
"""
Establishes connection with a node to:
1) Send version message
2) Receive version and verack message
3) Send getaddr message
4) Receive addr message containing list of adjacent nodes
"""
to_addr = (node, port)
conn = Connection(to_addr, socket_timeout=SETTINGS['socket_timeout'],
user_agent=SETTINGS['user_agent'],
start_height=SETTINGS['start_height'])
error = ""
handshake_msgs = []
addr_msg = {}
try:
conn.open()
handshake_msgs = conn.handshake()
addr_msg = conn.getaddr()
except (ProtocolError, socket.error) as err:
error = str(err)
logging.debug("{}: {} dropped".format(err, to_addr))
finally:
conn.close()
nodes = None
degree = 0
# Record version information for the remote node
if len(handshake_msgs) > 0:
if not self.database.has_node(node, table="nodes_version"):
self.database.add_node_version(node, handshake_msgs[0])
nodes = []
if 'addr_list' in addr_msg:
nodes = self.get_nodes_from_addr_list(addr_msg['addr_list'])
degree = len(nodes)
# Cache the result in database for reuse in subsequent getaddr()
# calls for the same node.
self.database.add_node_getaddr(node, nodes, error, degree)
return nodes
def task():
"""
Assigned to a worker to retrieve (pop) a node from the reachable set and
attempt to establish and maintain connection with the node.
"""
node = REDIS_CONN.spop('reachable')
if node is None:
return
(address, port, services, height) = eval(node)
node = (address, port)
if REDIS_CONN.sadd('open', node) == 0:
logging.debug("Connection exists: %s", node)
return
handshake_msgs = []
conn = Connection(node, (SETTINGS['source_address'], 0),
socket_timeout=SETTINGS['socket_timeout'],
protocol_version=SETTINGS['protocol_version'],
to_services=services,
from_services=SETTINGS['services'],
user_agent=SETTINGS['user_agent'],
height=height,
relay=SETTINGS['relay'])
try:
conn.open()
handshake_msgs = conn.handshake()
except (ProtocolError, ConnectionError, socket.error) as err:
logging.debug("Closing %s (%s)", node, err)
conn.close()
if len(handshake_msgs) == 0:
REDIS_CONN.srem('open', node)
return
Keepalive(conn=conn, version_msg=handshake_msgs[0]).keepalive()
conn.close()
REDIS_CONN.srem('open', node)
def task():
"""
Assigned to a worker to retrieve (pop) a node from the reachable set and
attempt to establish and maintain connection with the node.
"""
node = REDIS_CONN.spop('reachable')
if node is None:
return
(address, port, services, height) = eval(node)
node = (address, port)
if REDIS_CONN.sadd('open', node) == 0:
logging.debug("Connection exists: %s", node)
return
handshake_msgs = []
conn = Connection(node, (SETTINGS['source_address'], 0),
socket_timeout=SETTINGS['socket_timeout'],
protocol_version=SETTINGS['protocol_version'],
to_services=services,
from_services=SETTINGS['services'],
user_agent=SETTINGS['user_agent'],
height=height,
relay=SETTINGS['relay'])
try:
conn.open()
handshake_msgs = conn.handshake()
except (ProtocolError, ConnectionError, socket.error) as err:
logging.debug("Closing %s (%s)", node, err)
conn.close()
if len(handshake_msgs) == 0:
REDIS_CONN.srem('open', node)
return
Keepalive(conn=conn, version_msg=handshake_msgs[0]).keepalive()
conn.close()
REDIS_CONN.srem('open', node)
def connect(redis_conn, key):
"""
Establishes connection with a node to:
1) Send version message
2) Receive version and verack message
3) Send getaddr message
4) Receive addr message containing list of peering nodes
Stores state and height for node in Redis.
"""
handshake_msgs = []
addr_msgs = []
redis_conn.set(key, "") # Set Redis key for a new node
(address, port, services) = key[5:].split("-", 2)
services = int(services)
height = redis_conn.get('height')
if height:
height = int(height)
proxy = None
if address.endswith(".onion"):
proxy = CONF['tor_proxy']
conn = Connection((address, int(port)), (CONF['source_address'], 0),
magic_number=CONF['magic_number'],
socket_timeout=CONF['socket_timeout'],
proxy=proxy,
protocol_version=CONF['protocol_version'],
to_services=services,
from_services=CONF['services'],
user_agent=CONF['user_agent'],
height=height,
relay=CONF['relay'])
print(address)
print(int(port))
print(CONF['magic_number'])
print(CONF['socket_timeout'])
print(proxy)
print(CONF['protocol_version'])
print(CONF['services'])
print(CONF['user_agent'])
print(height)
print(CONF['relay'])
try:
logging.debug("Connecting to %s", conn.to_addr)
conn.open()
handshake_msgs = conn.handshake()
print("OK")
except (ProtocolError, ConnectionError, socket.error) as err:
logging.debug("%s: %s", conn.to_addr, err)
print("just die")
redis_pipe = redis_conn.pipeline()
if len(handshake_msgs) > 0:
try:
conn.getaddr(block=False)
except (ProtocolError, ConnectionError, socket.error) as err:
logging.debug("%s: %s", conn.to_addr, err)
else:
addr_wait = 0
while addr_wait < CONF['socket_timeout']:
addr_wait += 1
gevent.sleep(0.3)
try:
msgs = conn.get_messages(commands=['addr'])
except (ProtocolError, ConnectionError, socket.error) as err:
logging.debug("%s: %s", conn.to_addr, err)
break
if msgs and any([msg['count'] > 1 for msg in msgs]):
addr_msgs = msgs
break
version_msg = handshake_msgs[0]
from_services = version_msg.get('services', 0)
if from_services != services:
logging.debug("%s Expected %d, got %d for services", conn.to_addr,
services, from_services)
key = "node:{}-{}-{}".format(address, port, from_services)
height_key = "height:{}-{}-{}".format(address, port, from_services)
redis_pipe.setex(height_key, CONF['max_age'],
version_msg.get('height', 0))
now = int(time.time())
(peers, excluded) = enumerate_node(redis_pipe, addr_msgs, now)
logging.debug("%s Peers: %d (Excluded: %d)", conn.to_addr, peers,
excluded)
redis_pipe.set(key, "")
redis_pipe.sadd('up', key)
conn.close()
redis_pipe.execute()
def connect(network, address, port, to_services, network_data, user_agent=None, explicit_p2p=False, p2p_nodes=True,
from_services=None, keepalive=False, attempt=1):
now = datetime.datetime.utcnow()
results = {'network': network, 'address': address, 'port': port, 'timestamp': now, 'seen': 0, 'attempt': attempt}
try:
handshake_msgs = []
new_addrs = []
proxy = None
if address.endswith(".onion"):
proxy = CONF['tor_proxy']
conn = Connection((address, port),
(CONF['source_address'], 0),
magic_number=network_data['magic_number'],
socket_timeout=CONF['socket_timeout'],
proxy=proxy,
protocol_version=int(network_data['protocol_version']),
min_protocol_version=network_data['min_protocol_version'],
to_services=int(to_services),
from_services=int(from_services or network_data['services']),
user_agent=user_agent or CONF['user_agent'],
height=int(network_data['height']),
relay=CONF['relay'])
try:
conn.open()
except (ProtocolError, ConnectionError, socket.error) as err:
results['error'] = str(err)
logging.debug("connection failed %s %s", type(err), err)
else:
try:
handshake_msgs = conn.handshake()
assert handshake_msgs
results['seen'] = 1
results['height'] = int(handshake_msgs[0]['height'])
results['version'] = int(handshake_msgs[0]['version'])
results['user_agent'] = handshake_msgs[0]['user_agent'].decode()
results['services'] = int(handshake_msgs[0]['services'])
except (ProtocolError, ConnectionError, socket.error, AssertionError) as err:
results['error'] = str(err)
logging.debug("handshake failed %s", err)
msgs = []
if len(handshake_msgs) > 0 and (p2p_nodes or explicit_p2p):
getaddr = True
chance = CONF['getaddr_prop']
if chance < 1.0 and p2p_nodes and not explicit_p2p and not "--seed" in sys.argv:
if np.random.rand() > chance:
getaddr = False
if getaddr:
try:
conn.getaddr(block=False)
msgs = msgs + conn.get_messages(commands=[b"addr"])
time.sleep(5)
msgs = msgs + conn.get_messages(commands=[b"addr"])
except (ProtocolError, ConnectionError, socket.error) as err:
logging.debug("getaddr failed %s", err)
if keepalive:
Keepalive(conn, 10).keepalive(addr=True if p2p_nodes else False)
for msg in msgs:
if msg['count'] > 1:
ts = now.timestamp()
for addr in msg['addr_list']:
if ts - addr['timestamp'] < 12 * 60 * 60: # within 6 hours
new_addrs.append(addr)
conn.close()
return results, new_addrs
except Exception as err:
logging.warning("unspecified connection error: %s", err)
return {}, []
def task():
"""
Assigned to a worker to retrieve (pop) a node from the reachable set and
attempt to establish and maintain connection with the node.
"""
node = REDIS_CONN.spop('reachable')
if node is None:
return
(address, port, services, height) = eval(node)
node = (address, port)
# Check if prefix has hit its limit
cidr_key = None
if ":" in address and CONF['ipv6_prefix'] < 128:
cidr = ip_to_network(address, CONF['ipv6_prefix'])
cidr_key = 'ping:cidr:{}'.format(cidr)
nodes = REDIS_CONN.incr(cidr_key)
logging.info("+CIDR %s: %d", cidr, nodes)
if nodes > CONF['nodes_per_ipv6_prefix']:
logging.info("CIDR limit reached: %s", cidr)
nodes = REDIS_CONN.decr(cidr_key)
logging.info("-CIDR %s: %d", cidr, nodes)
return
if REDIS_CONN.sadd('open', node) == 0:
logging.info("Connection exists: %s", node)
if cidr_key:
nodes = REDIS_CONN.decr(cidr_key)
logging.info("-CIDR %s: %d", cidr, nodes)
return
proxy = None
if address.endswith(".onion"):
proxy = random.choice(CONF['tor_proxies'])
handshake_msgs = []
conn = Connection(node,
(CONF['source_address'], 0),
magic_number=CONF['magic_number'],
socket_timeout=CONF['socket_timeout'],
proxy=proxy,
protocol_version=CONF['protocol_version'],
to_services=services,
from_services=CONF['services'],
user_agent=CONF['user_agent'],
height=height,
relay=CONF['relay'])
try:
logging.debug("Connecting to %s", conn.to_addr)
conn.open()
handshake_msgs = conn.handshake()
except (ProtocolError, ConnectionError, socket.error) as err:
logging.debug("Closing %s (%s)", node, err)
conn.close()
if len(handshake_msgs) == 0:
if cidr_key:
nodes = REDIS_CONN.decr(cidr_key)
logging.info("-CIDR %s: %d", cidr, nodes)
REDIS_CONN.srem('open', node)
return
if address.endswith(".onion"):
# Map local port to .onion node
local_port = conn.socket.getsockname()[1]
logging.info("Local port %s: %d", conn.to_addr, local_port)
REDIS_CONN.set('onion:{}'.format(local_port), conn.to_addr)
Keepalive(conn=conn, version_msg=handshake_msgs[0]).keepalive()
conn.close()
if cidr_key:
nodes = REDIS_CONN.decr(cidr_key)
logging.info("-CIDR %s: %d", cidr, nodes)
REDIS_CONN.srem('open', node)
def task():
"""
Assigned to a worker to retrieve (pop) a node from the reachable set and
attempt to establish and maintain connection with the node.
"""
node = REDIS_CONN.spop('reachable')
if node is None:
return
(address, port, services, height) = eval(node)
node = (address, port)
# Check if prefix has hit its limit
cidr_key = None
if ":" in address and SETTINGS['ipv6_prefix'] < 128:
cidr = ip_to_network(address, SETTINGS['ipv6_prefix'])
cidr_key = 'ping:cidr:{}'.format(cidr)
nodes = REDIS_CONN.incr(cidr_key)
logging.info("+CIDR %s: %d", cidr, nodes)
if nodes > SETTINGS['nodes_per_ipv6_prefix']:
logging.info("CIDR limit reached: %s", cidr)
nodes = REDIS_CONN.decr(cidr_key)
logging.info("-CIDR %s: %d", cidr, nodes)
return
if REDIS_CONN.sadd('open', node) == 0:
logging.info("Connection exists: %s", node)
if cidr_key:
nodes = REDIS_CONN.decr(cidr_key)
logging.info("-CIDR %s: %d", cidr, nodes)
return
proxy = None
if address.endswith(".onion"):
proxy = SETTINGS['tor_proxy']
handshake_msgs = []
conn = Connection(node, (SETTINGS['source_address'], 0),
socket_timeout=SETTINGS['socket_timeout'],
proxy=proxy,
protocol_version=SETTINGS['protocol_version'],
to_services=services,
from_services=SETTINGS['services'],
user_agent=SETTINGS['user_agent'],
height=height,
relay=SETTINGS['relay'])
try:
logging.debug("Connecting to %s", conn.to_addr)
conn.open()
handshake_msgs = conn.handshake()
except (ProtocolError, ConnectionError, socket.error) as err:
logging.debug("Closing %s (%s)", node, err)
conn.close()
if len(handshake_msgs) == 0:
if cidr_key:
nodes = REDIS_CONN.decr(cidr_key)
logging.info("-CIDR %s: %d", cidr, nodes)
REDIS_CONN.srem('open', node)
return
if address.endswith(".onion"):
# Map local port to .onion node
local_port = conn.socket.getsockname()[1]
logging.info("%s: 127.0.0.1:%d", conn.to_addr, local_port)
REDIS_CONN.set('onion:{}'.format(local_port), conn.to_addr)
Keepalive(conn=conn, version_msg=handshake_msgs[0]).keepalive()
conn.close()
if cidr_key:
nodes = REDIS_CONN.decr(cidr_key)
logging.info("-CIDR %s: %d", cidr, nodes)
REDIS_CONN.srem('open', node)
def connect(redis_conn, key):
"""
Establishes connection with a node to:
1) Send version message
2) Receive version and verack message
3) Send getaddr message
4) Receive addr message containing list of peering nodes
Stores state and height for node in Redis.
"""
handshake_msgs = []
addr_msgs = []
redis_conn.set(key, "") # Set Redis key for a new node
(address, port, services) = key[5:].split("-", 2)
services = int(services)
height = redis_conn.get('height')
if height:
height = int(height)
proxy = None
if address.endswith(".onion"):
proxy = CONF['tor_proxy']
conn = Connection((address, int(port)),
(CONF['source_address'], 0),
magic_number=CONF['magic_number'],
socket_timeout=CONF['socket_timeout'],
proxy=proxy,
protocol_version=CONF['protocol_version'],
to_services=services,
from_services=CONF['services'],
user_agent=CONF['user_agent'],
height=height,
relay=CONF['relay'])
try:
logging.debug("Connecting to %s", conn.to_addr)
conn.open()
handshake_msgs = conn.handshake()
except (ProtocolError, ConnectionError, socket.error) as err:
logging.debug("%s: %s", conn.to_addr, err)
redis_pipe = redis_conn.pipeline()
if len(handshake_msgs) > 0:
try:
conn.getaddr(block=False)
except (ProtocolError, ConnectionError, socket.error) as err:
logging.debug("%s: %s", conn.to_addr, err)
else:
addr_wait = 0
while addr_wait < CONF['socket_timeout']:
addr_wait += 1
gevent.sleep(0.3)
try:
msgs = conn.get_messages(commands=['addr'])
except (ProtocolError, ConnectionError, socket.error) as err:
logging.debug("%s: %s", conn.to_addr, err)
break
if msgs and any([msg['count'] > 1 for msg in msgs]):
addr_msgs = msgs
break
version_msg = handshake_msgs[0]
from_services = version_msg.get('services', 0)
if from_services != services:
logging.debug("%s Expected %d, got %d for services", conn.to_addr,
services, from_services)
key = "node:{}-{}-{}".format(address, port, from_services)
height_key = "height:{}-{}-{}".format(address, port, from_services)
redis_pipe.setex(height_key, CONF['max_age'],
version_msg.get('height', 0))
now = int(time.time())
(peers, excluded) = enumerate_node(redis_pipe, addr_msgs, now)
logging.debug("%s Peers: %d (Excluded: %d)",
conn.to_addr, peers, excluded)
redis_pipe.set(key, "")
redis_pipe.sadd('up', key)
conn.close()
redis_pipe.execute()
class ClientHandler:
LOGIN_MSG = 'Choose a nickname.'
HELLO_MSG = 'You are in, {}!'
NICK_TAKEN_MSG = 'Nickname {} is taken, choose another one.'
SHUTDOWN_MSG = 'Server shut down and you were disconnected.'
def __init__(self, sock, addr, server):
self.server = server
self.conn = Connection(sock, addr)
self.inbox = Queue(maxsize=MAX_CLIENT_QUEUE)
self.nickname = None
self.channel = None
@property
def addr(self):
return self.conn.addr
def init(self):
try:
self.conn.send_msg(self.LOGIN_MSG)
while True:
try:
nickname = self.conn.recv_msg()
self.server.register_client(nickname, self)
self.server.addr_client[self.addr] = self
self.nickname = nickname
self.conn.send_msg(self.HELLO_MSG.format(nickname))
break
except NickTakenError:
self.conn.send_msg(self.NICK_TAKEN_MSG.format(nickname))
except OSError:
self.shutdown()
# Connection fully established.
self.server.subscribe(self.nickname, 'default')
self.channel = self.server.channels['default']
self.in_channel()
def shutdown(self):
try:
self.conn.send_msg(self.SHUTDOWN_MSG)
self.conn.close()
except OSError:
pass # yeah, really
self.channel.unsub(self.nickname)
self.server.remove_client(self.nickname)
def in_channel(self):
receiver = threading.Thread(target=self.process_inbox, daemon=True)
receiver.start()
try:
while True:
msg = self.conn.recv_msg()
msg = '{}: {}'.format(self.nickname, msg)
self.channel.publish(('tcp', msg), self.nickname)
except ConnectionError:
self.shutdown()
def process_inbox(self):
try:
while True:
kin, msg = self.inbox.get()
if kin == 'udp':
send_udp(msg, self.addr)
else:
self.conn.send_msg(msg)
except ConnectionError:
self.shutdown()
def push(self, msg):
self.inbox.put(msg)
def handle_udp(self, msg):
self.channel.publish(('udp', msg), self.nickname)
class Client:
def __init__(self, server_host='127.0.0.1', server_port=8000, client_host='127.0.0.1', client_port=8001):
self.server_addr = (server_host, server_port)
self.client_addr = (client_host, client_port)
self.conn = None
def run(self):
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind(self.client_addr)
s.connect(self.server_addr)
self.conn = Connection(s, self.server_addr)
receiver = threading.Thread(target=self.receive, daemon=True)
receiver.start()
udp_receiver = threading.Thread(target=self.receive_udp, daemon=True)
udp_receiver.start()
try:
while True:
msg = input()
if msg == 'U' or msg == 'M':
with open('ascii.txt', 'r', encoding='ascii') as ascii_art:
content = ascii_art.read()
if msg == 'U':
addr = self.server_addr
else:
addr = MULTICAST_ADDR
send_udp(content, addr, self.client_addr)
else:
self.conn.send_msg(msg)
except KeyboardInterrupt:
print('Received Ctrl+C.')
except ConnectionError:
print('Connection to server closed.')
def receive(self):
try:
while True:
msg = self.conn.recv_msg()
print('>>> {}'.format(msg))
except ConnectionError:
self.conn.close()
def receive_udp(self):
with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as u_sock:
with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as m_sock:
u_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
u_sock.bind(self.client_addr)
host = socket.gethostbyname(socket.gethostname())
m_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
m_sock.setsockopt(socket.SOL_IP, socket.IP_ADD_MEMBERSHIP,
socket.inet_aton(MULTICAST_ADDR[0]) + socket.inet_aton(host))
m_sock.bind(MULTICAST_ADDR)
ev_loop = select.epoll()
u_fd, m_fd = u_sock.fileno(), m_sock.fileno()
ev_loop.register(u_fd, select.EPOLLIN)
ev_loop.register(m_fd, select.EPOLLIN)
try:
while True:
events = ev_loop.poll()
for file_no, event in events:
if event | select.EPOLLIN:
if file_no == u_fd:
msg = u_sock.recv(MAX_UDP_SIZE)
else:
msg, addr = m_sock.recvfrom(MAX_UDP_SIZE)
if addr == self.client_addr:
continue
print(msg.decode())
except ConnectionError:
self.conn.close()