Add support for Google Cloud (#1447)

Differentiate between Google its own apps/services and Google Cloud.
We already do something similar for Amazon vs AWS and Microsoft vs Azure.

1 files changed, 41 insertions, 0 deletions

diff --git a/utils/google.py b/utils/google.py
new file mode 100644
index 000000000..e8b4114c8
--- /dev/null
+++ b/utils/google.py
@@ -0,0 +1,41 @@
+#!/usr/bin/env python3
+
+import json
+import urllib.request
+import netaddr
+
+GOOG_URL="https://www.gstatic.com/ipranges/goog.json"
+CLOUD_URL="https://www.gstatic.com/ipranges/cloud.json"
+
+def read_url(url):
+   try:
+      s = urllib.request.urlopen(url).read()
+      return json.loads(s)
+   except urllib.error.HTTPError:
+      print("Invalid HTTP response from %s" % url)
+      return {}
+   except json.decoder.JSONDecodeError:
+      print("Could not parse HTTP response from %s" % url)
+      return {}
+
+def main():
+   goog_json=read_url(GOOG_URL)
+   cloud_json=read_url(CLOUD_URL)
+
+   if goog_json and cloud_json:
+#      print("{} published: {}".format(GOOG_URL,goog_json.get('creationTime')))
+#      print("{} published: {}".format(CLOUD_URL,cloud_json.get('creationTime')))
+      goog_cidrs = netaddr.IPSet()
+      for pref in goog_json['prefixes']:
+         if pref.get('ipv4Prefix'):
+            goog_cidrs.add(pref.get('ipv4Prefix'))
+      cloud_cidrs = netaddr.IPSet()
+      for pref in cloud_json['prefixes']:
+         if pref.get('ipv4Prefix'):
+            cloud_cidrs.add(pref.get('ipv4Prefix'))
+#      print("IP ranges for Google APIs and services default domains:")
+      for i in goog_cidrs.difference(cloud_cidrs).iter_cidrs():
+         print(i)
+
+if __name__=='__main__':
+   main()