function is_ipv4_network renamed

more detailed check of cidr format

requests/utils.py

@@ -437,9 +437,17 @@ def is_ipv4_address(string_ip):
     return True
 
 
-def is_ipv4_network(string_network):
-    """Very simple check of the network format in no_proxy variable"""
-    if '/' in string_network:
+def is_valid_cidr(string_network):
+    """Very simple check of the cidr format in no_proxy variable"""
+    if string_network.count('/') == 1:
+        try:
+            mask = int(string_network.split('/')[1])
+        except ValueError:
+            return False
+
+        if mask < 1 or mask > 32:
+            return False
+
         try:
             socket.inet_aton(string_network.split('/')[0])
         except socket.error:
@@ -467,7 +475,7 @@ def get_environ_proxies(url):
         ip = netloc.split(':')[0]
         if is_ipv4_address(ip):
             for proxy_ip in no_proxy:
-                if is_ipv4_network(proxy_ip):
+                if is_valid_cidr(proxy_ip):
                     if address_in_network(ip, proxy_ip):
                         return {}
         else:

test_requests.py

@@ -934,10 +934,10 @@ class UtilsTestCase(unittest.TestCase):
         assert not is_ipv4_address('8.8.8.8.8')
         assert not is_ipv4_address('localhost.localdomain')
 
-    def test_is_ipv4_network(self):
-        from requests.utils import is_ipv4_network
-        assert not is_ipv4_network('8.8.8.8')
-        assert is_ipv4_network('192.168.1.0/24')
+    def test_is_valid_cidr(self):
+        from requests.utils import is_valid_cidr
+        assert not is_valid_cidr('8.8.8.8')
+        assert is_valid_cidr('192.168.1.0/24')
 
     def test_dotted_netmask(self):
         from requests.utils import dotted_netmask