78 lines
2.1 KiB
Python
78 lines
2.1 KiB
Python
import requests
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import socket
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from urllib.request import urlopen
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from urllib.error import URLError
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from .log import LOG
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def connected():
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"""Check connection by connecting to 8.8.8.8 and if google.com is
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reachable if this fails, Check Microsoft NCSI is used as a backup.
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Returns:
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True if internet connection can be detected
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"""
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if _connected_dns():
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# Outside IP is reachable check if names are resolvable
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return _connected_google()
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else:
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# DNS can't be reached, do a complete fetch in case it's blocked
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return _connected_ncsi()
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def _connected_ncsi():
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"""Check internet connection by retrieving the Microsoft NCSI endpoint.
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Returns:
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True if internet connection can be detected
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"""
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try:
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r = requests.get('http://www.msftncsi.com/ncsi.txt')
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if r.text == 'Microsoft NCSI':
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return True
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except Exception:
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pass
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return False
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def _connected_dns(host="8.8.8.8", port=53, timeout=3):
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"""Check internet connection by connecting to DNS servers
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Returns:
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True if internet connection can be detected
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"""
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# Thanks to 7h3rAm on
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# Host: 8.8.8.8 (google-public-dns-a.google.com)
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# OpenPort: 53/tcp
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# Service: domain (DNS/TCP)
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try:
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s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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s.settimeout(timeout)
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s.connect((host, port))
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return True
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except IOError:
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try:
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s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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s.settimeout(timeout)
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s.connect(("8.8.4.4", port))
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return True
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except IOError:
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return False
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def _connected_google():
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"""Check internet connection by connecting to www.google.com
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Returns:
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True if connection attempt succeeded
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"""
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connect_success = False
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try:
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urlopen('https://www.google.com', timeout=3)
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except URLError as ue:
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LOG.debug('Attempt to connect to internet failed: ' + str(ue.reason))
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else:
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connect_success = True
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return connect_success
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