Readding tvhproxy
This commit is contained in:
Joan
226
tvhProxy/ssdp.py
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226
tvhProxy/ssdp.py
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# Licensed under the MIT license
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# http://opensource.org/licenses/mit-license.php
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# Copyright 2005, Tim Potter <tpot@samba.org>
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# Copyright 2006 John-Mark Gurney <gurney_j@resnet.uroegon.edu>
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# Copyright (C) 2006 Fluendo, S.A. (www.fluendo.com).
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# Copyright 2006,2007,2008,2009 Frank Scholz <coherence@beebits.net>
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# Copyright 2016 Erwan Martin <public@fzwte.net>
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#
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# Implementation of a SSDP server.
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#
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import random
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import time
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import socket
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import logging
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from email.utils import formatdate
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from errno import ENOPROTOOPT
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SSDP_PORT = 1900
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SSDP_ADDR = '239.255.255.250'
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SERVER_ID = 'ZeWaren example SSDP Server'
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logger = logging.getLogger()
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class SSDPServer:
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"""A class implementing a SSDP server. The notify_received and
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searchReceived methods are called when the appropriate type of
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datagram is received by the server."""
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known = {}
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def __init__(self):
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self.sock = None
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def run(self):
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self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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if hasattr(socket, "SO_REUSEPORT"):
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try:
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self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
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except socket.error as le:
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# RHEL6 defines SO_REUSEPORT but it doesn't work
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if le.errno == ENOPROTOOPT:
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pass
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else:
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raise
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addr = socket.inet_aton(SSDP_ADDR)
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interface = socket.inet_aton('0.0.0.0')
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cmd = socket.IP_ADD_MEMBERSHIP
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self.sock.setsockopt(socket.IPPROTO_IP, cmd, addr + interface)
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self.sock.bind(('0.0.0.0', SSDP_PORT))
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self.sock.settimeout(1)
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while True:
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try:
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data, addr = self.sock.recvfrom(1024)
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self.datagram_received(data, addr)
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except socket.timeout:
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continue
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self.shutdown()
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def shutdown(self):
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for st in self.known:
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if self.known[st]['MANIFESTATION'] == 'local':
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self.do_byebye(st)
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def datagram_received(self, data, host_port):
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"""Handle a received multicast datagram."""
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(host, port) = host_port
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try:
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header, payload = data.decode().split('\r\n\r\n')[:2]
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except ValueError as err:
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logger.error(err)
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return
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lines = header.split('\r\n')
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cmd = lines[0].split(' ')
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lines = map(lambda x: x.replace(': ', ':', 1), lines[1:])
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lines = filter(lambda x: len(x) > 0, lines)
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headers = [x.split(':', 1) for x in lines]
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headers = dict(map(lambda x: (x[0].lower(), x[1]), headers))
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logger.info('SSDP command %s %s - from %s:%d' % (cmd[0], cmd[1], host, port))
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logger.debug('with headers: {}.'.format(headers))
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if cmd[0] == 'M-SEARCH' and cmd[1] == '*':
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# SSDP discovery
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self.discovery_request(headers, (host, port))
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elif cmd[0] == 'NOTIFY' and cmd[1] == '*':
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# SSDP presence
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logger.debug('NOTIFY *')
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else:
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logger.warning('Unknown SSDP command %s %s' % (cmd[0], cmd[1]))
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def register(self, manifestation, usn, st, location, server=SERVER_ID, cache_control='max-age=1800', silent=False,
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host=None):
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"""Register a service or device that this SSDP server will
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respond to."""
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logging.info('Registering %s (%s)' % (st, location))
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self.known[usn] = {}
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self.known[usn]['USN'] = usn
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self.known[usn]['LOCATION'] = location
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self.known[usn]['ST'] = st
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self.known[usn]['EXT'] = ''
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self.known[usn]['SERVER'] = server
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self.known[usn]['CACHE-CONTROL'] = cache_control
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self.known[usn]['MANIFESTATION'] = manifestation
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self.known[usn]['SILENT'] = silent
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self.known[usn]['HOST'] = host
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self.known[usn]['last-seen'] = time.time()
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if manifestation == 'local' and self.sock:
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self.do_notify(usn)
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def unregister(self, usn):
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logger.info("Un-registering %s" % usn)
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del self.known[usn]
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def is_known(self, usn):
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return usn in self.known
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def send_it(self, response, destination, delay, usn):
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logger.debug('send discovery response delayed by %ds for %s to %r' % (delay, usn, destination))
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try:
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self.sock.sendto(response.encode(), destination)
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except (AttributeError, socket.error) as msg:
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logger.warning("failure sending out byebye notification: %r" % msg)
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def discovery_request(self, headers, host_port):
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"""Process a discovery request. The response must be sent to
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the address specified by (host, port)."""
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(host, port) = host_port
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logger.info('Discovery request from (%s,%d) for %s' % (host, port, headers['st']))
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logger.info('Discovery request for %s' % headers['st'])
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# Do we know about this service?
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for i in self.known.values():
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if i['MANIFESTATION'] == 'remote':
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continue
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if headers['st'] == 'ssdp:all' and i['SILENT']:
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continue
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if i['ST'] == headers['st'] or headers['st'] == 'ssdp:all':
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response = ['HTTP/1.1 200 OK']
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usn = None
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for k, v in i.items():
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if k == 'USN':
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usn = v
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if k not in ('MANIFESTATION', 'SILENT', 'HOST'):
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response.append('%s: %s' % (k, v))
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if usn:
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response.append('DATE: %s' % formatdate(timeval=None, localtime=False, usegmt=True))
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response.extend(('', ''))
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delay = random.randint(0, int(headers['mx']))
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self.send_it('\r\n'.join(response), (host, port), delay, usn)
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def do_notify(self, usn):
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"""Do notification"""
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if self.known[usn]['SILENT']:
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return
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logger.info('Sending alive notification for %s' % usn)
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resp = [
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'NOTIFY * HTTP/1.1',
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'HOST: %s:%d' % (SSDP_ADDR, SSDP_PORT),
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'NTS: ssdp:alive',
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]
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stcpy = dict(self.known[usn].items())
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stcpy['NT'] = stcpy['ST']
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del stcpy['ST']
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del stcpy['MANIFESTATION']
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del stcpy['SILENT']
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del stcpy['HOST']
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del stcpy['last-seen']
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resp.extend(map(lambda x: ': '.join(x), stcpy.items()))
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resp.extend(('', ''))
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logger.debug('do_notify content: %s', resp)
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try:
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self.sock.sendto('\r\n'.join(resp).encode(), (SSDP_ADDR, SSDP_PORT))
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self.sock.sendto('\r\n'.join(resp).encode(), (SSDP_ADDR, SSDP_PORT))
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except (AttributeError, socket.error) as msg:
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logger.warning("failure sending out alive notification: %r" % msg)
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def do_byebye(self, usn):
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"""Do byebye"""
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logger.info('Sending byebye notification for %s' % usn)
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resp = [
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'NOTIFY * HTTP/1.1',
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'HOST: %s:%d' % (SSDP_ADDR, SSDP_PORT),
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'NTS: ssdp:byebye',
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]
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try:
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stcpy = dict(self.known[usn].items())
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stcpy['NT'] = stcpy['ST']
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del stcpy['ST']
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del stcpy['MANIFESTATION']
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del stcpy['SILENT']
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del stcpy['HOST']
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del stcpy['last-seen']
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resp.extend(map(lambda x: ': '.join(x), stcpy.items()))
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resp.extend(('', ''))
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logger.debug('do_byebye content: %s', resp)
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if self.sock:
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try:
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self.sock.sendto('\r\n'.join(resp), (SSDP_ADDR, SSDP_PORT))
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except (AttributeError, socket.error) as msg:
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logger.error("failure sending out byebye notification: %r" % msg)
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except KeyError as msg:
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logger.error("error building byebye notification: %r" % msg)
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