commit b09f06665d0423ba60d5229b896873c065efc8a7
Author: Félix Baylac-Jacqué <felix@alternativebit.fr>
Date:   Sun Oct 18 16:52:57 2020 +0200

    test dns sacha

diff --git a/dns-sacha.py b/dns-sacha.py
new file mode 100755
index 0000000..f3a92a2
--- /dev/null
+++ b/dns-sacha.py
@@ -0,0 +1,86 @@
+#!/usr/bin/env python3
+
+import functools
+import json
+import socket
+import sys
+
+'''
+Takes as input a list of domain names to test. Return wether they are
+IPv4/IPv6-compatible.
+
+Usage:
+
+> cat test.txt
+baionet.fr
+google.com
+
+> cat test.txt | ./dns-sacha.py  | jq
+
+[
+  {
+    "host": "baionet.fr",
+    "v4": true,
+    "v6": false
+  },
+  {
+    "host": "google.com",
+    "v4": true,
+    "v6": true
+  }
+]
+'''
+
+class UrlIp:
+    '''
+    Struct wrapping a single record entry. Does it have IPv4 support?
+    IPv6 support?
+    '''
+    def __init__(self, host, v4, v6):
+       self.host = host
+       self.v4 = v4
+       self.v6 = v6
+    def toJSON(self):
+       return json.dumps(self, default=lambda o: o.__dict__,sort_keys=True)
+
+def get_host_records(host):
+    '''
+    Folds all the DNS entries of a Host and looks whether or not we
+    can find v4 and v6 records.
+
+    reduce == left fold in the python world btw...
+    '''
+    records = socket.getaddrinfo(host, 80)
+    return(functools.reduce(_test_record,records,UrlIp(host,False,False)))
+
+def _test_record(urlip, rec):
+    '''
+    Fold function for get_host_records. Too big for a lambda not to
+    get messy.
+
+    Gotta love Python...
+    '''
+    (family, _rtype,  proto, _canonname, _sockaddr) = rec
+    if family == socket.AF_INET:
+        urlip.v4 = True
+    elif family == socket.AF_INET6:
+        urlip.v6 = True
+    return urlip
+
+def parse_hosts(file_name):
+    with open(file_name, 'r') as f:
+        return f.readlines()
+
+def render_results(results):
+    '''
+    Takes an array of UrlIp and renders that to json.
+
+    Python's json.dumps only works with dictionnaries, not classes.
+    Extracting the dictionnary representation of the class.
+    '''
+    return(json.dumps([r.__dict__ for r in results]))
+
+if __name__ == '__main__':
+    entries = [l.strip() for l in sys.stdin.readlines()]
+    test_results = [get_host_records(entry) for entry in entries]
+    print(render_results(test_results))