Define types for C calls in netlink_lib
Borrowed from neutron fix related to oslo.privsep 1.31 https://review.openstack.org/#/c/629335/ ----- Previously this was not done, which meant all arguments were assumed to be ints. As long as we didn't get any large pointer addresses this worked fine, but for some reason the addition of threading to oslo.privsep triggered larger addresses that were then truncated. This caused segfaults in the underlying C library because we were passing it invalid pointers. This change sets argument and return types for all of the calls that are used in the module. ----- Note: The root cause of the failure of neutron_fwaas.tests.functional.privileged.InNamespaceTest.test_in_namespace is different and it will be covered by the next patch (See Ie5b238f1df707ea3ce50b5711ff791bac2681a2f), so it is skipped temporarily. Partial-Bug: #1811506 Change-Id: I3ea8c71a96d4c38988a38947c0ebcaf602a57842
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@ -48,9 +48,44 @@ from neutron_fwaas.privileged import utils as fwaas_utils
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LOG = logging.getLogger(__name__)
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nfct = ctypes.CDLL(util.find_library('netfilter_conntrack'))
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nfct_lib = util.find_library('netfilter_conntrack')
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nfct = ctypes.CDLL(nfct_lib)
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libc = ctypes.CDLL(util.find_library('libc.so.6'))
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# In unit tests the actual nfct library may not be installed, and since we
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# don't make actual calls to it we don't want to add a hard dependency.
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if nfct_lib:
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# It's important that the types be defined properly on all of the functions
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# we call from nfct, otherwise pointers can be truncated and cause
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# segfaults.
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nfct.nfct_set_attr.argtypes = [ctypes.c_void_p,
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ctypes.c_int,
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ctypes.c_void_p]
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nfct.nfct_set_attr_u8.argtypes = [ctypes.c_void_p,
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ctypes.c_int,
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ctypes.c_uint8]
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nfct.nfct_set_attr_u16.argtypes = [ctypes.c_void_p,
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ctypes.c_int,
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ctypes.c_uint16]
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nfct.nfct_snprintf.argtypes = [ctypes.c_char_p,
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ctypes.c_uint,
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ctypes.c_void_p,
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ctypes.c_uint,
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ctypes.c_uint,
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ctypes.c_uint]
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nfct.nfct_new.restype = ctypes.c_void_p
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nfct.nfct_destroy.argtypes = [ctypes.c_void_p]
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nfct.nfct_query.argtypes = [ctypes.c_void_p,
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ctypes.c_int,
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ctypes.c_void_p]
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nfct.nfct_callback_register.argtypes = [ctypes.c_void_p,
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ctypes.c_int,
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ctypes.c_void_p,
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ctypes.c_void_p]
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nfct.nfct_open.restype = ctypes.c_void_p
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nfct.nfct_close.argtypes = [ctypes.c_void_p]
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IP_VERSIONS = [constants.IP_VERSION_4, constants.IP_VERSION_6]
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DATA_CALLBACK = None
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@ -14,6 +14,7 @@
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# under the License.
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import os
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import unittest
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from neutron.tests.common import net_helpers
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from neutron.tests.functional import base
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@ -27,6 +28,7 @@ def get_netns_inode(namespace):
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class InNamespaceTest(base.BaseSudoTestCase):
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@unittest.skip('Temporarily skipped until a fix against oslo.privsep 1.31')
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def test_in_namespace(self):
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namespace = self.useFixture(net_helpers.NamespaceFixture()).name
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expected = get_netns_inode(namespace)
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