Add networktools, though some ideas are still not implemented.

voussoirkit/networktools.py

@@ -0,0 +1,39 @@
+import requests
+import socket
+
+from voussoirkit import vlogging
+
+log = vlogging.getLogger(__name__, 'networktools')
+
+def get_external_ip():
+    url = 'https://voussoir.net/whatsmyip'
+    response = requests.get(url)
+    response.raise_for_status()
+    ip = response.text.strip()
+    return ip
+
+def get_lan_ip():
+    '''
+    thank you unknwntech
+    https://stackoverflow.com/a/166589
+    '''
+    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    sock.connect(('8.8.8.8', 80))
+    return sock.getsockname()[0]
+
+def get_gateway_ip():
+    # How to find ip of the router?
+    raise NotImplementedError
+
+def has_lan():
+    # Open a socket to the router
+    raise NotImplementedError
+
+def has_internet(timeout=2):
+    socket.setdefaulttimeout(timeout)
+    try:
+        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+        sock.connect(('8.8.8.8', 53))
+        return True
+    except socket.error as exc:
+        return False