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Tiny python SSDP discovery library with no external dependencies
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# Copyright 2014 Dan Krause | |
# | |
# 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 httplib | |
import StringIO | |
class SSDPResponse(object): | |
class _FakeSocket(StringIO.StringIO): | |
def makefile(self, *args, **kw): | |
return self | |
def __init__(self, response): | |
r = httplib.HTTPResponse(self._FakeSocket(response)) | |
r.begin() | |
self.location = r.getheader("location") | |
self.usn = r.getheader("usn") | |
self.st = r.getheader("st") | |
self.cache = r.getheader("cache-control").split("=")[1] | |
def __repr__(self): | |
return "<SSDPResponse({location}, {st}, {usn})>".format(**self.__dict__) | |
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 = {} | |
for _ in range(retries): | |
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) | |
sock.sendto(message.format(*group, st=service, mx=mx), group) | |
while True: | |
try: | |
response = SSDPResponse(sock.recv(1024)) | |
responses[response.location] = response | |
except socket.timeout: | |
break | |
return responses.values() | |
# Example: | |
# import ssdp | |
# ssdp.discover("roku:ecp") |
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Hi,
Great bit of code. I've been chasing a real gssdp / gupnp problem and are wondering how easy it would be to turn this code into a M-SEARCH listener? I need to prove that my Linux gssdp/gupnp libraries are actually doing their job. Rygel which uses theses libs seems to miss a lot of SSDP searches from various apps like iPad MConnect. Big question is that do the python libs use the same libraries as a bottom end.
Thanks,