AJ Keller
60 linhas
2.1 KiB
Python
60 linhas
2.1 KiB
Python
# Copyright 2014 Dan Krause
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import socket
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import httplib
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import StringIO
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class SSDPResponse(object):
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class _FakeSocket(StringIO.StringIO):
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def makefile(self, *args, **kw):
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return self
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def __init__(self, response):
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r = httplib.HTTPResponse(self._FakeSocket(response))
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r.begin()
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self.location = r.getheader("location")
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self.usn = r.getheader("usn")
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self.st = r.getheader("st")
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self.cache = r.getheader("cache-control").split("=")[1]
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def __repr__(self):
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return "<SSDPResponse({location}, {st}, {usn})>".format(**self.__dict__)
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def discover(service, timeout=5, retries=1, mx=3, wifi_found_cb=None):
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group = ("239.255.255.250", 1900)
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message = "\r\n".join([
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'M-SEARCH * HTTP/1.1',
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'HOST: {0}:{1}',
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'MAN: "ssdp:discover"',
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'ST: {st}','MX: {mx}','',''])
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socket.setdefaulttimeout(timeout)
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responses = {}
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for _ in range(retries):
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sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
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sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 2)
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sock.sendto(message.format(*group, st=service, mx=mx), group)
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while True:
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try:
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response = SSDPResponse(sock.recv(1024))
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if wifi_found_cb is not None:
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wifi_found_cb(response)
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responses[response.location] = response
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except socket.timeout:
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break
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return responses.values()
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