Redesigned no_proxy ip range imlementation to use only stdlib functions

AUTHORS.rst

@@ -143,3 +143,4 @@ Patches and Suggestions
 - Thomas Weißschuh <thomas@t-8ch.de> @t-8ch
 - Jayson Vantuyl <jayson@aggressive.ly> @kagato
 - Pengfei.X <pengphy@gmail.com>
+- Kamil Madac <kamil.madac@gmail.com>

requests/utils.py

@@ -17,7 +17,8 @@ import os
 import platform
 import re
 import sys
-import netaddr
+import socket
+import struct
 
 from . import __version__
 from . import certs
@@ -406,6 +407,39 @@ def requote_uri(uri):
     return quote(unquote_unreserved(uri), safe="!#$%&'()*+,/:;=?@[]~")
 
 
+def address_in_network(ip,net):
+    '''This function allows you to check if on IP belogs to a Network'''
+    ipaddr = struct.unpack('=L', socket.inet_aton(ip))[0]
+    netaddr, bits = net.split('/')
+    netmask = struct.unpack('=L', socket.inet_aton(dotted_netmask(int(bits))))[0]
+    network = struct.unpack('=L', socket.inet_aton(netaddr))[0] & netmask
+    return (ipaddr & netmask) == (network & netmask)
+
+
+def dotted_netmask(mask):
+    bits = 0xffffffff ^ (1 << 32 - mask) - 1
+    return socket.inet_ntoa(struct.pack('>I', bits))
+
+
+def is_ipv4_address(string_ip):
+    try:
+        socket.inet_aton(string_ip)
+    except BaseException:
+        return False
+    return True
+
+
+def is_ipv4_network(string_network):
+    if '/' in string_network:
+        try:
+            socket.inet_aton(string_network.split('/')[0])
+        except OSError:
+            return False
+    else:
+        return False
+    return True
+
+
 def get_environ_proxies(url):
     """Return a dict of environment proxies."""
 
@@ -421,21 +455,12 @@ def get_environ_proxies(url):
         # the end of the netloc, both with and without the port.
         no_proxy = no_proxy.replace(' ', '').split(',')
 
-        ip = None
-        try:
-            ip = netaddr.IPAddress(netloc.split(':')[0])
-        except netaddr.AddrFormatError:
-            pass
-
-        if ip:
+        ip = netloc.split(':')[0]
+        if is_ipv4_address(ip):
             for proxy_ip in no_proxy:
-                proxy_ipaddress = None
-                try:
-                    proxy_ipaddress = netaddr.IPNetwork(proxy_ip)
-                except (netaddr.AddrFormatError, ValueError):
-                    continue
-                if proxy_ipaddress and ip in proxy_ipaddress:
-                    return {}
+                if is_ipv4_network(proxy_ip):
+                    if address_in_network(ip, proxy_ip):
+                        return {}
         else:
             for host in no_proxy:
                 if netloc.endswith(host) or netloc.split(':')[0].endswith(host):

test_requests.py

@@ -913,11 +913,20 @@ class UtilsTestCase(unittest.TestCase):
     def test_get_environ_proxies_ip_ranges(self):
         """ Ensures that IP addresses are correctly matches with ranges in no_proxy variable """
         from requests.utils import get_environ_proxies
-        os.environ['no_proxy'] = "127.0.0.1,localhost.localdomain,192.168.0.0/24,172.16.1.1"
+        os.environ['no_proxy'] = "192.168.0.0/24,127.0.0.1,localhost.localdomain,172.16.1.1"
         assert get_environ_proxies('http://192.168.0.1:5000/') == {}
         assert get_environ_proxies('http://192.168.0.1/') == {}
         assert get_environ_proxies('http://172.16.1.1/') == {}
-        assert get_environ_proxies('http://192.168.1.1:5000/') == {'no': os.environ['no_proxy']}
+        assert get_environ_proxies('http://172.16.1.1:5000/') == {}
+        assert get_environ_proxies('http://192.168.1.1:5000/') != {}
+        assert get_environ_proxies('http://192.168.1.1/') != {}
+
+    def test_get_environ_proxies(self):
+        """ Ensures that IP addresses are correctly matches with ranges in no_proxy variable """
+        from requests.utils import get_environ_proxies
+        os.environ['no_proxy'] = "127.0.0.1,localhost.localdomain,192.168.0.0/24,172.16.1.1"
+        assert get_environ_proxies('http://localhost.localdomain:5000/v1.0/') == {}
+        assert get_environ_proxies('http://www.requests.com/') != {}
 
 if __name__ == '__main__':
     unittest.main()