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Issue#4v2 #8

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fb4ba3a
Improve error handling and storage of calls parameters
Apr 12, 2016
79920e3
Fix Issue#4
Apr 12, 2016
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15 changes: 12 additions & 3 deletions pynetfilter_conntrack/conntrack.py
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Original file line number Diff line number Diff line change
Expand Up @@ -24,9 +24,14 @@ def register_callback(self, callback, event_type=NFCT_T_ALL, data=None):
return: NFCT_CB_CONTINUE, NFCT_CB_FAILURE, NFCT_CB_STOP,
or NFCT_CB_STOLEN (like continue, but ct is not freed).
"""
self.event_type = event_type
self.callback = nfct_callback_t(callback)
self.callback_arg = data
nfct_callback_register(self.handle, event_type, self.callback, self.callback_arg)
ret = nfct_callback_register(self.handle, self.event_type, self.callback, self.callback_arg)
if ret == -1:
self._error('nfct_callback_register')
elif ret != 0:
self._error('nfct_callback_register unknown return code')

def unregister_callback(self):
"""Unregister callback"""
Expand Down Expand Up @@ -90,9 +95,13 @@ def query(self, command, argument):

May raise a RuntimeError.
"""
ret = nfct_query(self.handle, command, argument)
if ret != 0:
self.query_type = command

ret = nfct_query(self.handle, self.query_type, byref(argument))
if ret == -1:
self._error('nfct_query')
elif ret != 0:
self._error('nfct_query unknown return code')

def catch(self, callback):
"""
Expand Down
7 changes: 5 additions & 2 deletions pynetfilter_conntrack/conntrack_base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -16,9 +16,12 @@ def __init__(self, subsys, subscriptions):
self.conntrack = None
self.handle = None

self.subsys = subsys
self.subscriptions = subscriptions

# Open a conntrack handler
self.handle = nfct_open(subsys, subscriptions)
if not self.handle:
self.handle = nfct_open(self.subsys, self.subscriptions)
if self.handle == None:
self._error('nfct_new')

def _error(self, func_name):
Expand Down
10 changes: 5 additions & 5 deletions pynetfilter_conntrack/func.py
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Original file line number Diff line number Diff line change
Expand Up @@ -15,8 +15,8 @@
#
#nf_conntrack_p = POINTER(nf_conntrack)
#nfct_handle_p = POINTER(nfct_handle)
nf_conntrack_p = c_int
nfct_handle_p = c_int
nf_conntrack_p = c_void_p
nfct_handle_p = c_void_p

class nfct_conntrack_compare_t(Structure):
_fields_ = (
Expand All @@ -33,7 +33,7 @@ class nfct_conntrack_compare_t(Structure):
# void *data)
#
# Callback type
nfct_callback_t = CFUNCTYPE(c_int, c_int, nf_conntrack_p, c_void_p)
nfct_callback_t = CFUNCTYPE(c_int, c_uint, nf_conntrack_p, c_void_p)

#--------------------------------------------------------------------------
# struct nf_conntrack *nfct_new(void): Allocate a new conntrack
Expand Down Expand Up @@ -81,7 +81,7 @@ class nfct_conntrack_compare_t(Structure):
# On error, -1 is returned and errno is explicitely set. On success, 0
# is returned
nfct_query = library.nfct_query
nfct_query.argtypes = (nfct_handle_p, c_int, c_void_p)
nfct_query.argtypes = (nfct_handle_p, c_uint, c_void_p)
nfct_query.restype = c_int

#--------------------------------------------------------------------------
Expand All @@ -93,7 +93,7 @@ class nfct_conntrack_compare_t(Structure):
# void *data);
# Register callback.
nfct_callback_register = library.nfct_callback_register
nfct_callback_register.argtypes = (nfct_handle_p, c_int, nfct_callback_t, c_void_p)
nfct_callback_register.argtypes = (nfct_handle_p, c_uint, nfct_callback_t, c_void_p)
nfct_callback_register.restype = c_int

#--------------------------------------------------------------------------
Expand Down