ssdp3.py

#   Copyright 2014 Dan Krause, Python 3 hack 2016 Adam Baxter
#
#   Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
#   You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS,
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#   See the License for the specific language governing permissions and
#   limitations under the License.

import socket
import http.client
import io


class SSDPResponse(object):
    class _FakeSocket(io.BytesIO):
        def makefile(self, *args, **kw):
            return self

    def __init__(self, response):
        r = http.client.HTTPResponse(self._FakeSocket(response))
        r.begin()
        self.location = r.getheader("location")
        self.usn = r.getheader("usn")


def discover(service, timeout=5, retries=1, mx=3):
    group = ("239.255.255.250", 1900)
    message = "\r\n".join([
        'M-SEARCH * HTTP/1.1',
        'HOST: {0}:{1}',
        'MAN: "ssdp:discover"',
        'ST: {st}', 'MX: {mx}', '', ''])
    socket.setdefaulttimeout(timeout)
    responses = {}
    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 2)
    message_bytes = message.format(*group, st=service, mx=mx).encode('utf-8')
    sock.sendto(message_bytes, group)

    while True:
        try:
            response = SSDPResponse(sock.recv(1024))
            responses[response.location] = response
        except socket.timeout:
            break
    return list(responses.values())