"""
Support for discovery using GDM (Good Day Mate), multicast protocol by Plex.
# Licensed Apache 2.0
# From https://github.com/home-assistant/netdisco/netdisco/gdm.py
Inspired by:
hippojay's plexGDM: https://github.com/hippojay/script.plexbmc.helper/resources/lib/plexgdm.py
iBaa's PlexConnect: https://github.com/iBaa/PlexConnect/PlexAPI.py
"""
import socket
import struct
[docs]class GDM:
"""Base class to discover GDM services.
Attributes:
entries (List<dict>): List of server and/or client data discovered.
"""
def __init__(self):
self.entries = []
[docs] def scan(self, scan_for_clients=False):
"""Scan the network."""
self.update(scan_for_clients)
[docs] def all(self, scan_for_clients=False):
"""Return all found entries.
Will scan for entries if not scanned recently.
"""
self.scan(scan_for_clients)
return list(self.entries)
[docs] def find_by_content_type(self, value):
"""Return a list of entries that match the content_type."""
self.scan()
return [entry for entry in self.entries
if value in entry['data']['Content-Type']]
[docs] def find_by_data(self, values):
"""Return a list of entries that match the search parameters."""
self.scan()
return [entry for entry in self.entries
if all(item in entry['data'].items()
for item in values.items())]
[docs] def update(self, scan_for_clients):
"""Scan for new GDM services.
Examples of the dict list assigned to self.entries by this function:
Server:
[{'data': {
'Content-Type': 'plex/media-server',
'Host': '53f4b5b6023d41182fe88a99b0e714ba.plex.direct',
'Name': 'myfirstplexserver',
'Port': '32400',
'Resource-Identifier': '646ab0aa8a01c543e94ba975f6fd6efadc36b7',
'Updated-At': '1585769946',
'Version': '1.18.8.2527-740d4c206',
},
'from': ('10.10.10.100', 32414)}]
Clients:
[{'data': {'Content-Type': 'plex/media-player',
'Device-Class': 'stb',
'Name': 'plexamp',
'Port': '36000',
'Product': 'Plexamp',
'Protocol': 'plex',
'Protocol-Capabilities': 'timeline,playback,playqueues,playqueues-creation',
'Protocol-Version': '1',
'Resource-Identifier': 'b6e57a3f-e0f8-494f-8884-f4b58501467e',
'Version': '1.1.0',
},
'from': ('10.10.10.101', 32412)}]
"""
gdm_msg = 'M-SEARCH * HTTP/1.0'.encode('ascii')
gdm_timeout = 1
self.entries = []
known_responses = []
# setup socket for discovery -> multicast message
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.settimeout(gdm_timeout)
# Set the time-to-live for messages for local network
sock.setsockopt(socket.IPPROTO_IP,
socket.IP_MULTICAST_TTL,
struct.pack("B", gdm_timeout))
if scan_for_clients:
# setup socket for broadcast to Plex clients
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
gdm_ip = '255.255.255.255'
gdm_port = 32412
else:
# setup socket for multicast to Plex server(s)
gdm_ip = '239.0.0.250'
gdm_port = 32414
try:
# Send data to the multicast group
sock.sendto(gdm_msg, (gdm_ip, gdm_port))
# Look for responses from all recipients
while True:
try:
bdata, host = sock.recvfrom(1024)
data = bdata.decode('utf-8')
if '200 OK' in data.splitlines()[0]:
ddata = {k: v.strip() for (k, v) in (
line.split(':') for line in
data.splitlines() if ':' in line)}
identifier = ddata.get('Resource-Identifier')
if identifier and identifier in known_responses:
continue
known_responses.append(identifier)
self.entries.append({'data': ddata,
'from': host})
except socket.timeout:
break
finally:
sock.close()
[docs]def main():
"""Test GDM discovery."""
from pprint import pprint
gdm = GDM()
pprint("Scanning GDM for servers...")
gdm.scan()
pprint(gdm.entries)
pprint("Scanning GDM for clients...")
gdm.scan(scan_for_clients=True)
pprint(gdm.entries)
if __name__ == "__main__":
main()