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101 lines
2.7 KiB
101 lines
2.7 KiB
"""
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Module that implements UPNP protocol to discover Chromecasts
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"""
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import select
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import socket
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import logging
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import datetime as dt
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# pylint: disable=import-error
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try: # Python 2
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import urlparse
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except ImportError: # Python 3
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import urllib.parse as urlparse
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DISCOVER_TIMEOUT = 10
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SSDP_ADDR = "239.255.255.250"
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SSDP_PORT = 1900
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SSDP_MX = 1
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SSDP_ST = "urn:dial-multiscreen-org:service:dial:1"
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SSDP_REQUEST = 'M-SEARCH * HTTP/1.1\r\n' + \
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'HOST: {}:{:d}\r\n'.format(SSDP_ADDR, SSDP_PORT) + \
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'MAN: "ssdp:discover"\r\n' + \
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'MX: {:d}\r\n'.format(SSDP_MX) + \
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'ST: {}\r\n'.format(SSDP_ST) + \
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'\r\n'
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# pylint: disable=too-many-locals, too-many-branches
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def discover_chromecasts(max_devices=None, timeout=DISCOVER_TIMEOUT):
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"""
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Sends a message over the network to discover Chromecasts and returns
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a list of found IP addresses.
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Inspired by Crimsdings
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https://github.com/crimsdings/ChromeCast/blob/master/cc_discovery.py
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"""
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ips = []
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calc_now = dt.datetime.now
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start = calc_now()
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try:
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sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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sock.sendto(SSDP_REQUEST.encode("ascii"), (SSDP_ADDR, SSDP_PORT))
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sock.setblocking(0)
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while True:
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time_diff = calc_now() - start
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# pylint: disable=maybe-no-member
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seconds_left = timeout - time_diff.seconds
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if seconds_left <= 0:
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return ips
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ready = select.select([sock], [], [], seconds_left)[0]
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if ready:
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response = sock.recv(1024).decode("ascii")
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found_ip = found_st = None
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headers = response.split("\r\n\r\n", 1)[0]
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for header in headers.split("\r\n"):
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parts = header.split(": ", 1)
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# Headers start with something like 'HTTP/1.1 200 OK'
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# We cannot split that up in key-value pair, so skip
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if len(parts) != 2:
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continue
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key, value = parts
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if key == "LOCATION":
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url = urlparse.urlparse(value)
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found_ip = url.hostname
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elif key == "ST":
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found_st = value
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if found_st == SSDP_ST and found_ip:
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ips.append(found_ip)
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if max_devices and len(ips) == max_devices:
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return ips
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except socket.error:
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logging.getLogger(__name__).exception(
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"Socket error while discovering Chromecasts")
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finally:
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sock.close()
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return ips
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