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Issue #11500: Fixed a bug in the os x proxy bypass code for fully qualified IP addresses in the proxy exception list 

Patch by Scott Wilson.
This commit is contained in:
Ronald Oussoren 2011-03-14 18:15:25 -04:00
parent 94eceeb89c
commit e72e161851
3 changed files with 102 additions and 58 deletions
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35
Lib/test/test_urllib2.py
View File

@ -6,7 +6,9 @@ import io
import socket
import urllib.request
from urllib.request import Request, OpenerDirector
# The proxy bypass method imported below has logic specific to the OSX
# proxy config data structure but is testable on all platforms.
from urllib.request import Request, OpenerDirector, _proxy_bypass_macosx_sysconf
# XXX
# Request
@ -1030,6 +1032,17 @@ class HandlerTests(unittest.TestCase):
self.assertEqual(req.get_host(), "www.python.org")
del os.environ['no_proxy']
def test_proxy_no_proxy_all(self):
os.environ['no_proxy'] = '*'
o = OpenerDirector()
ph = urllib.request.ProxyHandler(dict(http="proxy.example.com"))
o.add_handler(ph)
req = Request("http://www.python.org")
self.assertEqual(req.get_host(), "www.python.org")
r = o.open(req)
self.assertEqual(req.get_host(), "www.python.org")
del os.environ['no_proxy']
def test_proxy_https(self):
o = OpenerDirector()
@ -1070,6 +1083,26 @@ class HandlerTests(unittest.TestCase):
self.assertEqual(req.get_host(), "proxy.example.com:3128")
self.assertEqual(req.get_header("Proxy-authorization"),"FooBar")
def test_osx_proxy_bypass(self):
bypass = {
'exclude_simple': False,
'exceptions': ['foo.bar', '*.bar.com', '127.0.0.1', '10.10',
'10.0/16']
}
# Check hosts that should trigger the proxy bypass
for host in ('foo.bar', 'www.bar.com', '127.0.0.1', '10.10.0.1',
'10.0.0.1'):
self.assertTrue(_proxy_bypass_macosx_sysconf(host, bypass),
'expected bypass of %s to be True' % host)
# Check hosts that should not trigger the proxy bypass
for host in ('abc.foo.bar', 'bar.com', '127.0.0.2', '10.11.0.1', 'test'):
self.assertFalse(_proxy_bypass_macosx_sysconf(host, bypass),
'expected bypass of %s to be False' % host)
# Check the exclude_simple flag
bypass = {'exclude_simple': True, 'exceptions': []}
self.assertTrue(_proxy_bypass_macosx_sysconf('test', bypass))
def test_basic_auth(self, quote_char='"'):
opener = OpenerDirector()
password_manager = MockPasswordManager()

122
Lib/urllib/request.py
View File

@ -2175,68 +2175,76 @@ def proxy_bypass_environment(host):
return 0
# This code tests an OSX specific data structure but is testable on all
# platforms
def _proxy_bypass_macosx_sysconf(host, proxy_settings):
"""
Return True iff this host shouldn't be accessed using a proxy
This function uses the MacOSX framework SystemConfiguration
to fetch the proxy information.
proxy_settings come from _scproxy._get_proxy_settings or get mocked ie:
{ 'exclude_simple': bool,
'exceptions': ['foo.bar', '*.bar.com', '127.0.0.1', '10.1', '10.0/16']
}
"""
import re
import socket
from fnmatch import fnmatch
hostonly, port = splitport(host)
def ip2num(ipAddr):
parts = ipAddr.split('.')
parts = list(map(int, parts))
if len(parts) != 4:
parts = (parts + [0, 0, 0, 0])[:4]
return (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8) | parts[3]
# Check for simple host names:
if '.' not in host:
if proxy_settings['exclude_simple']:
return True
hostIP = None
for value in proxy_settings.get('exceptions', ()):
# Items in the list are strings like these: *.local, 169.254/16
if not value: continue
m = re.match(r"(\d+(?:\.\d+)*)(/\d+)?", value)
if m is not None:
if hostIP is None:
try:
hostIP = socket.gethostbyname(hostonly)
hostIP = ip2num(hostIP)
except socket.error:
continue
base = ip2num(m.group(1))
mask = m.group(2)
if mask is None:
mask = 8 * (m.group(1).count('.') + 1)
else:
mask = int(mask[1:])
mask = 32 - mask
if (hostIP >> mask) == (base >> mask):
return True
elif fnmatch(host, value):
return True
return False
if sys.platform == 'darwin':
from _scproxy import _get_proxy_settings, _get_proxies
def proxy_bypass_macosx_sysconf(host):
"""
Return True iff this host shouldn't be accessed using a proxy
This function uses the MacOSX framework SystemConfiguration
to fetch the proxy information.
"""
import re
import socket
from fnmatch import fnmatch
hostonly, port = splitport(host)
def ip2num(ipAddr):
parts = ipAddr.split('.')
parts = list(map(int, parts))
if len(parts) != 4:
parts = (parts + [0, 0, 0, 0])[:4]
return (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8) | parts[3]
proxy_settings = _get_proxy_settings()
# Check for simple host names:
if '.' not in host:
if proxy_settings['exclude_simple']:
return True
hostIP = None
for value in proxy_settings.get('exceptions', ()):
# Items in the list are strings like these: *.local, 169.254/16
if not value: continue
m = re.match(r"(\d+(?:\.\d+)*)(/\d+)?", value)
if m is not None:
if hostIP is None:
try:
hostIP = socket.gethostbyname(hostonly)
hostIP = ip2num(hostIP)
except socket.error:
continue
base = ip2num(m.group(1))
mask = m.group(2)
if mask is None:
mask = 8 * (m.group(1).count('.') + 1)
else:
mask = int(mask[1:])
mask = 32 - mask
if (hostIP >> mask) == (base >> mask):
return True
elif fnmatch(host, value):
return True
return False
return _proxy_bypass_macosx_sysconf(host, proxy_settings)
def getproxies_macosx_sysconf():
"""Return a dictionary of scheme -> proxy server URL mappings.

3
Misc/NEWS
View File

@ -197,6 +197,9 @@ Library
OSError exception when The OS had been told to ignore SIGCLD in our process
or otherwise not wait for exiting child processes.
- Issue #11500: Fixed a bug in the os x proxy bypass code for fully qualified
IP addresses in the proxy exception list.
Extensions
----------