beacon.py

   1 import re
   2 import struct
   3 from socket import *
   4 from threading import Timer
   5 import config
   6
   7 class Beacon:
   8
   9     UDPSock = socket(AF_INET, SOCK_DGRAM)
  10     UDPSock.setsockopt(SOL_SOCKET, SO_BROADCAST, 1)
  11     services = []
  12
  13     def add_service(self, service):
  14         self.services.append(service)
  15         self.send_beacon()
  16
  17     def format_services(self):
  18         return ';'.join(self.services)
  19
  20     def format_beacon(self, conntype, services=True):
  21         beacon = ['tivoconnect=1',
  22                   'swversion=1',
  23                   'method=%s' % conntype,
  24                   'identity=%s' % config.getGUID(),
  25                   'machine=%s' % gethostname(),
  26                   'platform=pc']
  27
  28         if services:
  29             beacon.append('services=' + self.format_services())
  30         else:
  31             beacon.append('services=TiVoMediaServer:0/http')
  32
  33         return '\n'.join(beacon)
  34
  35     def send_beacon(self):
  36         beacon_ips = config.getBeaconAddresses()
  37         for beacon_ip in beacon_ips.split():
  38             if beacon_ip != 'listen':
  39                 try:
  40                     self.UDPSock.sendto(self.format_beacon('broadcast'),
  41                                         (beacon_ip, 2190))
  42                 except error, e:
  43                     print e
  44
  45     def start(self):
  46         self.send_beacon()
  47         self.timer = Timer(60, self.start)
  48         self.timer.start()
  49
  50     def stop(self):
  51         self.timer.cancel()
  52
  53     def listen(self):
  54         """ For the direct-connect, TCP-style beacon """
  55         import thread
  56
  57         def server():
  58             TCPSock = socket(AF_INET, SOCK_STREAM)
  59             TCPSock.bind(('', 2190))
  60             TCPSock.listen(5)
  61
  62             while True:
  63                 # Wait for a connection
  64                 client, address = TCPSock.accept()
  65
  66                 # Accept the client's beacon
  67                 client_length = struct.unpack('!I', client.recv(4))[0]
  68                 client_message = client.recv(client_length)
  69
  70                 # Send ours
  71                 message = self.format_beacon('connected')
  72                 client.send(struct.pack('!I', len(message)))
  73                 client.send(message)
  74                 client.close()
  75
  76         thread.start_new_thread(server, ())
  77
  78     def get_name(self, address):
  79         """ Exchange beacons, and extract the machine name. """
  80         our_beacon = self.format_beacon('connected', False)
  81         machine_name = re.compile('machine=(.*)\n').search
  82
  83         try:
  84             tsock = socket()
  85             tsock.connect((address, 2190))
  86
  87             tsock.send(struct.pack('!I', len(our_beacon)))
  88             tsock.send(our_beacon)
  89
  90             length = struct.unpack('!I', tsock.recv(4))[0]
  91             tivo_beacon = tsock.recv(length)
  92
  93             tsock.close()
  94
  95             name = machine_name(tivo_beacon).groups()[0]
  96         except:
  97             name = address
  98
  99         return name
 100
 101 if __name__ == '__main__':
 102     b = Beacon()
 103
 104     b.add_service('TiVoMediaServer:9032/http')
 105     b.send_beacon()