256 lines
7.7 KiB
Python
256 lines
7.7 KiB
Python
# -*- coding: utf-8 -*-
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# vi:si:et:sw=4:sts=4:ts=4
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import json
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import socket
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import struct
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import _thread
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from threading import Thread
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import time
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from utils import valid, get_public_ipv6, get_local_ipv4, get_interface
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from settings import preferences, server, USER_ID, sk
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import state
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import db
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import user.models
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import logging
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logger = logging.getLogger('oml.localnodes')
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def can_connect(data):
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try:
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if ':' in data['host']:
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s = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
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else:
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s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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s.settimeout(1)
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s.connect((data['host'], data['port']))
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s.close()
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return True
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except:
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pass
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logger.debug('can_connect failed')
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return False
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class LocalNodesBase(Thread):
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_PORT = 9851
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_TTL = 1
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_TIMEOUT = 30
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def __init__(self, nodes):
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self._socket = None
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self._active = True
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self._nodes = nodes
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Thread.__init__(self)
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if not server['localnode_discovery']:
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return
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self.daemon = True
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self.start()
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def get_packet(self):
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self.host = self.get_ip()
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if self.host:
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message = json.dumps({
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'username': preferences.get('username', 'anonymous'),
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'host': self.host,
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'port': server['node_port'],
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'cert': server['cert']
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})
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sig = sk.sign(message.encode(), encoding='base64').decode()
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packet = json.dumps([sig, USER_ID, message]).encode()
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else:
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packet = None
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return packet
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def get_socket(self):
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pass
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def send(self):
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pass
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def receive(self):
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last = time.mktime(time.localtime())
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while self._active:
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try:
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s = self.get_socket()
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s.settimeout(self._TIMEOUT)
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s.bind(('', self._PORT))
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while self._active:
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data, addr = s.recvfrom(1024)
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if self._active:
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while data[-1] == 0:
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data = data[:-1] # Strip trailing \0's
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data = self.verify(data)
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if data:
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self.update_node(data)
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except socket.timeout:
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pass
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except:
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if self._active:
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logger.debug('receive failed. restart later', exc_info=1)
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time.sleep(10)
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finally:
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if self._active:
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now = time.mktime(time.localtime())
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if now - last > 60:
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last = now
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_thread.start_new_thread(self.send, ())
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def verify(self, data):
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try:
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packet = json.loads(data.decode())
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except:
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return None
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if len(packet) == 3:
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sig, user_id, data = packet
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if valid(user_id, data, sig):
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message = json.loads(data)
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message['id'] = user_id
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for key in ['id', 'username', 'host', 'port', 'cert']:
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if key not in message:
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return None
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return message
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def update_node(self, data):
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#fixme use local link address
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#print addr
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if data['id'] != USER_ID:
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if data['id'] not in self._nodes:
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_thread.start_new_thread(self.new_node, (data, ))
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elif can_connect(data):
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self._nodes[data['id']] = data
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def get(self, user_id):
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if user_id in self._nodes:
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if can_connect(self._nodes[user_id]):
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return self._nodes[user_id]
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def new_node(self, data):
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logger.debug('NEW NODE %s', data)
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if can_connect(data):
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self._nodes[data['id']] = data
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with db.session():
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u = user.models.User.get_or_create(data['id'])
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u.info['username'] = data['username']
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u.info['local'] = data
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u.update_name()
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u.save()
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state.nodes.queue('add', u.id)
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self.send()
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def get_ip(self):
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pass
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def run(self):
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self.send()
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self.receive()
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def join(self):
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self._active = False
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if self._socket:
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try:
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self._socket.shutdown(socket.SHUT_RDWR)
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except OSError:
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pass
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self._socket.close()
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return Thread.join(self)
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class LocalNodes4(LocalNodesBase):
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_BROADCAST = "239.255.255.250"
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_TTL = 1
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def send(self):
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packet = self.get_packet()
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if packet:
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logger.debug('send4 %s', packet)
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sockaddr = (self._BROADCAST, self._PORT)
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s = socket.socket (socket.AF_INET, socket.SOCK_DGRAM)
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s.setsockopt (socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, self._TTL)
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try:
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s.sendto(packet + b'\0', sockaddr)
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except:
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logger.debug('LocalNodes4.send failed', exc_info=1)
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s.close()
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def get_socket(self):
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s = socket.socket (socket.AF_INET, socket.SOCK_DGRAM)
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s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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if hasattr(socket, 'SO_REUSEPORT'):
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s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
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mreq = struct.pack("=4sl", socket.inet_aton(self._BROADCAST), socket.INADDR_ANY)
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s.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
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self._socket = s
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return s
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def get_ip(self):
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return get_local_ipv4()
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class LocalNodes6(LocalNodesBase):
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_BROADCAST = "ff02::1"
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def send(self):
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packet = self.get_packet()
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if packet:
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logger.debug('send6 %s', packet)
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ttl = struct.pack('@i', self._TTL)
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address = self._BROADCAST + get_interface()
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addrs = socket.getaddrinfo(address, self._PORT, socket.AF_INET6, socket.SOCK_DGRAM)
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addr = addrs[0]
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(family, socktype, proto, canonname, sockaddr) = addr
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s = socket.socket(family, socktype, proto)
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s.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_HOPS, ttl)
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try:
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s.sendto(packet + b'\0', sockaddr)
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except:
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logger.debug('LocalNodes6.send failed', exc_info=1)
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s.close()
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def get_socket(self):
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s = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
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s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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if hasattr(socket, 'SO_REUSEPORT'):
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s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
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group_bin = socket.inet_pton(socket.AF_INET6, self._BROADCAST) + b'\0'*4
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s.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_JOIN_GROUP, group_bin)
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self._socket = s
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return s
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def get_ip(self):
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return get_public_ipv6()
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class LocalNodes(object):
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_active = True
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_nodes4 = None
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_nodes6 = None
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def __init__(self):
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self._nodes = {}
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if not server['localnode_discovery']:
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return
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self._nodes4 = LocalNodes4(self._nodes)
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self._nodes6 = LocalNodes6(self._nodes)
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def cleanup(self):
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if self._active:
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for id in list(self._nodes.keys()):
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if not can_connect(self._nodes[id]):
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del self._nodes[id]
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if not self._active:
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break
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def get(self, user_id):
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if user_id in self._nodes:
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if can_connect(self._nodes[user_id]):
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return self._nodes[user_id]
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def join(self):
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self._active = False
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if self._nodes4:
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self._nodes4.join()
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if self._nodes6:
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self._nodes6.join()
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