119 lines
3.5 KiB
Python
119 lines
3.5 KiB
Python
# -*- coding: utf-8 -*-
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# vi:si:et:sw=4:sts=4:ts=4
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from __future__ import division
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import socket
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import thread
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import json
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import struct
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from threading import Thread
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from settings import preferences, server, USER_ID, sk
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from node.utils import get_public_ipv6
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from ed25519_utils import valid
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def can_connect(data):
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try:
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s = socket.socket(socket.AF_INET6, 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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return False
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class LocalNodes(Thread):
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_active = True
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_nodes = {}
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_BROADCAST = "ff02::1"
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_PORT = 9851
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TTL = 1
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def __init__(self, app):
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self._app = app
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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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self.host = get_public_ipv6()
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self.send()
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def send(self):
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if not server['localnode_discovery']:
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return
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s = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
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ttl = struct.pack('@i', self.TTL)
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s.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_HOPS, ttl)
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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, encoding='base64')
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packet = json.dumps([sig, USER_ID, message])
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s.sendto(packet + '\0', (self._BROADCAST, self._PORT))
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def receive(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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s.bind(('', self._PORT))
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group_bin = socket.inet_pton(socket.AF_INET6, self._BROADCAST) + '\0'*4
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s.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_JOIN_GROUP, group_bin)
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while self._active:
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data, addr = s.recvfrom(1024)
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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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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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#else:
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# print 'UPDATE NODE', data
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self._nodes[data['id']] = data
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def verify(self, data):
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try:
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packet = json.loads(data)
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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 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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print 'NEW NODE', data
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if can_connect(data):
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self._nodes[data['id']] = data
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with self._app.app_context():
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import user.models
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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.save()
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self.send()
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def run(self):
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self.receive()
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def join(self):
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self._active = False
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return Thread.join(self)
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