x/vmware-nsx
Code Issues Proposed changes

Added iptables_manager ( based on openstack/linux_net.py )

Browse Source 
This module will be the base library to implement security
groups and generic firewall.
It is an independent iptables module, made to be easy to package
if used by agents and also inside quantum

Using quantum.agent.linux.utils
Added support to root_helper

Change-Id: Iaa29322477fc2e753b52dc4f01e7c4a561110638
This commit is contained in:
Juliano Martinez 2012-06-18 11:00:45 -03:00
parent cabd706b48
commit 0061c0ce44
4 changed files with 672 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

342
quantum/agent/linux/iptables_manager.py Executable file
View File

@ -0,0 +1,342 @@
# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2012 Locaweb.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# @author: Juliano Martinez, Locaweb.
# based on
# https://github.com/openstack/nova/blob/master/nova/network/linux_net.py
"""Implements iptables rules using linux utilities."""
import ConfigParser
import inspect
import logging
import os
import subprocess
from quantum.agent.linux import utils
LOG = logging.getLogger(__name__)
# NOTE(vish): Iptables supports chain names of up to 28 characters, and we
# add up to 12 characters to binary_name which is used as a prefix,
# so we limit it to 16 characters.
# (max_chain_name_length - len('-POSTROUTING') == 16)
binary_name = os.path.basename(inspect.stack()[-1][1])[:16]
class IptablesRule(object):
"""An iptables rule.
You shouldn't need to use this class directly, it's only used by
IptablesManager.
"""
def __init__(self, chain, rule, wrap=True, top=False):
self.chain = chain
self.rule = rule
self.wrap = wrap
self.top = top
def __eq__(self, other):
return ((self.chain == other.chain) and
(self.rule == other.rule) and
(self.top == other.top) and
(self.wrap == other.wrap))
def __ne__(self, other):
return not self == other
def __str__(self):
if self.wrap:
chain = '%s-%s' % (binary_name, self.chain)
else:
chain = self.chain
return '-A %s %s' % (chain, self.rule)
class IptablesTable(object):
"""An iptables table."""
def __init__(self):
self.rules = []
self.chains = set()
self.unwrapped_chains = set()
def add_chain(self, name, wrap=True):
"""Adds a named chain to the table.
The chain name is wrapped to be unique for the component creating
it, so different components of Nova can safely create identically
named chains without interfering with one another.
At the moment, its wrapped name is <binary name>-<chain name>,
so if nova-compute creates a chain named 'OUTPUT', it'll actually
end up named 'nova-compute-OUTPUT'.
"""
if wrap:
self.chains.add(name)
else:
self.unwrapped_chains.add(name)
def remove_chain(self, name, wrap=True):
"""Remove named chain.
This removal "cascades". All rule in the chain are removed, as are
all rules in other chains that jump to it.
If the chain is not found, this is merely logged.
"""
if wrap:
chain_set = self.chains
else:
chain_set = self.unwrapped_chains
if name not in chain_set:
LOG.warn(('Attempted to remove chain %s which does not exist'),
name)
return
chain_set.remove(name)
self.rules = filter(lambda r: r.chain != name, self.rules)
if wrap:
jump_snippet = '-j %s-%s' % (binary_name, name)
else:
jump_snippet = '-j %s' % (name,)
self.rules = filter(lambda r: jump_snippet not in r.rule, self.rules)
def add_rule(self, chain, rule, wrap=True, top=False):
"""Add a rule to the table.
This is just like what you'd feed to iptables, just without
the '-A <chain name>' bit at the start.
However, if you need to jump to one of your wrapped chains,
prepend its name with a '$' which will ensure the wrapping
is applied correctly.
"""
if wrap and chain not in self.chains:
raise LookupError(('Unknown chain: %r') % chain)
if '$' in rule:
rule = ' '.join(map(self._wrap_target_chain, rule.split(' ')))
self.rules.append(IptablesRule(chain, rule, wrap, top))
def _wrap_target_chain(self, s):
if s.startswith('$'):
return '%s-%s' % (binary_name, s[1:])
return s
def remove_rule(self, chain, rule, wrap=True, top=False):
"""Remove a rule from a chain.
Note: The rule must be exactly identical to the one that was added.
You cannot switch arguments around like you can with the iptables
CLI tool.
"""
try:
self.rules.remove(IptablesRule(chain, rule, wrap, top))
except ValueError:
LOG.warn(('Tried to remove rule that was not there:'
' %(chain)r %(rule)r %(wrap)r %(top)r'),
{'chain': chain, 'rule': rule,
'top': top, 'wrap': wrap})
def empty_chain(self, chain, wrap=True):
"""Remove all rules from a chain."""
chained_rules = [rule for rule in self.rules
if rule.chain == chain and rule.wrap == wrap]
for rule in chained_rules:
self.rules.remove(rule)
class IptablesManager(object):
"""Wrapper for iptables.
See IptablesTable for some usage docs
A number of chains are set up to begin with.
First, quantum-filter-top. It's added at the top of FORWARD and OUTPUT. Its
name is not wrapped, so it's shared between the various nova workers. It's
intended for rules that need to live at the top of the FORWARD and OUTPUT
chains. It's in both the ipv4 and ipv6 set of tables.
For ipv4 and ipv6, the built-in INPUT, OUTPUT, and FORWARD filter chains
are wrapped, meaning that the "real" INPUT chain has a rule that jumps to
the wrapped INPUT chain, etc. Additionally, there's a wrapped chain named
"local" which is jumped to from quantum-filter-top.
For ipv4, the built-in PREROUTING, OUTPUT, and POSTROUTING nat chains are
wrapped in the same was as the built-in filter chains. Additionally,
there's a snat chain that is applied after the POSTROUTING chain.
"""
def __init__(self, _execute=None, state_less=False,
root_helper=None, use_ipv6=False):
if _execute:
self.execute = _execute
else:
self.execute = utils.execute
self.use_ipv6 = use_ipv6
self.root_helper = root_helper
self.ipv4 = {'filter': IptablesTable()}
self.ipv6 = {'filter': IptablesTable()}
# Add a quantum-filter-top chain. It's intended to be shared
# among the various nova components. It sits at the very top
# of FORWARD and OUTPUT.
for tables in [self.ipv4, self.ipv6]:
tables['filter'].add_chain('quantum-filter-top', wrap=False)
tables['filter'].add_rule('FORWARD', '-j quantum-filter-top',
wrap=False, top=True)
tables['filter'].add_rule('OUTPUT', '-j quantum-filter-top',
wrap=False, top=True)
tables['filter'].add_chain('local')
tables['filter'].add_rule('quantum-filter-top', '-j $local',
wrap=False)
# Wrap the built-in chains
builtin_chains = {4: {'filter': ['INPUT', 'OUTPUT', 'FORWARD']},
6: {'filter': ['INPUT', 'OUTPUT', 'FORWARD']}}
if not state_less:
self.ipv4.update({'nat': IptablesTable()})
builtin_chains[4].update({'nat': ['PREROUTING',
'OUTPUT', 'POSTROUTING']})
for ip_version in builtin_chains:
if ip_version == 4:
tables = self.ipv4
elif ip_version == 6:
tables = self.ipv6
for table, chains in builtin_chains[ip_version].iteritems():
for chain in chains:
tables[table].add_chain(chain)
tables[table].add_rule(chain, '-j $%s' %
(chain), wrap=False)
if not state_less:
# Add a quantum-postrouting-bottom chain. It's intended to be
# shared among the various nova components. We set it as the last
# chain of POSTROUTING chain.
self.ipv4['nat'].add_chain('quantum-postrouting-bottom',
wrap=False)
self.ipv4['nat'].add_rule('POSTROUTING',
'-j quantum-postrouting-bottom',
wrap=False)
# We add a snat chain to the shared quantum-postrouting-bottom
# chain so that it's applied last.
self.ipv4['nat'].add_chain('snat')
self.ipv4['nat'].add_rule('quantum-postrouting-bottom',
'-j $snat', wrap=False)
# And then we add a float-snat chain and jump to first thing in
# the snat chain.
self.ipv4['nat'].add_chain('float-snat')
self.ipv4['nat'].add_rule('snat', '-j $float-snat')
def apply(self):
"""Apply the current in-memory set of iptables rules.
This will blow away any rules left over from previous runs of the
same component of Nova, and replace them with our current set of
rules. This happens atomically, thanks to iptables-restore.
"""
s = [('/sbin/iptables', self.ipv4)]
if self.use_ipv6:
s += [('ip6tables', self.ipv6)]
for cmd, tables in s:
for table in tables:
current_table = (self.execute(['%s-save' % cmd, '-t', table],
root_helper=self.root_helper))
current_lines = current_table.split('\n')
new_filter = self._modify_rules(current_lines,
tables[table])
self.execute(['%s-restore' % (cmd)],
process_input='\n'.join(new_filter),
root_helper=self.root_helper)
LOG.debug(("IPTablesManager.apply completed with success"))
def _modify_rules(self, current_lines, table, binary=None):
unwrapped_chains = table.unwrapped_chains
chains = table.chains
rules = table.rules
# Remove any trace of our rules
new_filter = filter(lambda line: binary_name
not in line, current_lines)
seen_chains = False
rules_index = 0
for rules_index, rule in enumerate(new_filter):
if not seen_chains:
if rule.startswith(':'):
seen_chains = True
else:
if not rule.startswith(':'):
break
our_rules = []
for rule in rules:
rule_str = str(rule)
if rule.top:
# rule.top == True means we want this rule to be at the top.
# Further down, we weed out duplicates from the bottom of the
# list, so here we remove the dupes ahead of time.
new_filter = filter(lambda s: s.strip() != rule_str.strip(),
new_filter)
our_rules += [rule_str]
new_filter[rules_index:rules_index] = our_rules
new_filter[rules_index:rules_index] = [':%s - [0:0]' % (name)
for name in unwrapped_chains]
new_filter[rules_index:rules_index] = [':%s-%s - [0:0]' %
(binary_name, name)
for name in chains]
seen_lines = set()
def _weed_out_duplicates(line):
line = line.strip()
if line in seen_lines:
return False
else:
seen_lines.add(line)
return True
# We filter duplicates, letting the *last* occurrence take
# precedence.
new_filter.reverse()
new_filter = filter(_weed_out_duplicates, new_filter)
new_filter.reverse()
return new_filter

34
quantum/rootwrap/iptables-firewall-agent.py Executable file
View File

@ -0,0 +1,34 @@
# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2012 Locaweb.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# @author: Juliano Martinez, Locaweb.
from quantum.rootwrap import filters
filterlist = [
# quantum/agent/linux/iptables_manager.py
# "iptables-save", ...
filters.CommandFilter("/sbin/iptables-save", "root"),
filters.CommandFilter("/sbin/iptables-restore", "root"),
filters.CommandFilter("/sbin/ip6tables-save", "root"),
filters.CommandFilter("/sbin/ip6tables-restore", "root"),
# quantum/agent/linux/iptables_manager.py
# "iptables", "-A", ...
filters.CommandFilter("/sbin/iptables", "root"),
filters.CommandFilter("/sbin/ip6tables", "root"),
]

3
quantum/rootwrap/wrapper.py
View File

@ -22,7 +22,8 @@ import sys
FILTERS_MODULES = ['quantum.rootwrap.linuxbridge-agent',
'quantum.rootwrap.openvswitch-agent',
'quantum.rootwrap.ryu-agent']
'quantum.rootwrap.ryu-agent',
'quantum.rootwrap.iptables-firewall-agent']
def load_filters():

294
quantum/tests/unit/test_iptables_manager.py Executable file
View File

@ -0,0 +1,294 @@
# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2012 Locaweb.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# @author: Juliano Martinez, Locaweb.
import os
import inspect
import unittest
import mox
from quantum.agent.linux import iptables_manager
class IptablesManagerStateFulTestCase(unittest.TestCase):
def setUp(self):
self.mox = mox.Mox()
self.root_helper = 'sudo'
self.iptables = (iptables_manager.
IptablesManager(root_helper=self.root_helper))
self.mox.StubOutWithMock(self.iptables, "execute")
def tearDown(self):
self.mox.UnsetStubs()
def test_binary_name(self):
self.assertEqual(iptables_manager.binary_name,
os.path.basename(inspect.stack()[-1][1])[:16])
def test_add_and_remove_chain(self):
bn = iptables_manager.binary_name
self.iptables.execute(['/sbin/iptables-save', '-t', 'filter'],
root_helper=self.root_helper).AndReturn('')
nat_dump = (':%s-OUTPUT - [0:0]\n:%s-snat - [0:0]\n:%s-PREROUTING -'
' [0:0]\n:%s-float-snat - [0:0]\n:%s-POSTROUTING - [0:0]'
'\n:quantum-postrouting-bottom - [0:0]\n-A PREROUTING -j'
' %s-PREROUTING\n-A OUTPUT -j %s-OUTPUT\n-A POSTROUTING '
'-j %s-POSTROUTING\n-A POSTROUTING -j quantum-postroutin'
'g-bottom\n-A quantum-postrouting-bottom -j %s-snat\n-A '
'%s-snat -j %s-float-snat\n' % (bn, bn, bn, bn, bn, bn,
bn, bn, bn, bn, bn))
self.iptables.execute(['/sbin/iptables-restore'],
process_input=(':%s-FORWARD - [0:0]\n:%s-INPUT'
' - [0:0]\n:%s-local - [0:0]\n:%s-filter - [0:'
'0]\n:%s-OUTPUT - [0:0]\n:quantum-filter-top -'
' [0:0]\n-A FORWARD -j quantum-filter-top\n-A '
'OUTPUT -j quantum-filter-top\n-A quantum-filt'
'er-top -j %s-local\n-A INPUT -j %s-INPUT\n-A '
'OUTPUT -j %s-OUTPUT\n-A FORWARD -j %s-FORWARD'
'\n' % (bn, bn, bn, bn, bn, bn, bn, bn, bn)
), root_helper=self.root_helper).AndReturn(None)
self.iptables.execute(['/sbin/iptables-save', '-t', 'nat'],
root_helper=self.root_helper).AndReturn('')
self.iptables.execute(['/sbin/iptables-restore'],
process_input=nat_dump,
root_helper=self.root_helper).AndReturn(None)
self.iptables.execute(['/sbin/iptables-save', '-t', 'filter'],
root_helper=self.root_helper).AndReturn('')
self.iptables.execute(['/sbin/iptables-restore'],
process_input=(':%s-FORWARD - [0:0]\n:%s-INPUT'
' - [0:0]\n:%s-local - [0:0]\n:%s-OUTPUT - [0:'
'0]\n:quantum-filter-top - [0:0]\n-A FORWARD -'
'j quantum-filter-top\n-A OUTPUT -j quantum-fi'
'lter-top\n-A quantum-filter-top -j %s-local\n'
'-A INPUT -j %s-INPUT\n-A OUTPUT -j %s-OUTPUT'
'\n-A FORWARD -j %s-FORWARD\n' % (bn, bn, bn, bn,
bn, bn, bn, bn)), root_helper=self.root_helper
).AndReturn(None)
self.iptables.execute(['/sbin/iptables-save', '-t', 'nat'],
root_helper=self.root_helper).AndReturn('')
self.iptables.execute(['/sbin/iptables-restore'],
process_input=nat_dump,
root_helper=self.root_helper).AndReturn(None)
self.mox.ReplayAll()
self.iptables.ipv4['filter'].add_chain('filter')
self.iptables.apply()
self.iptables.ipv4['filter'].remove_chain('filter')
self.iptables.apply()
self.mox.VerifyAll()
def test_add_filter_rule(self):
bn = iptables_manager.binary_name
self.iptables.execute(['/sbin/iptables-save', '-t', 'filter'],
root_helper=self.root_helper).AndReturn('')
nat_dump = (':%s-OUTPUT - [0:0]\n:%s-snat - [0:0]\n:%s-PREROUTING -'
' [0:0]\n:%s-float-snat - [0:0]\n:%s-POSTROUTING - [0:0]'
'\n:quantum-postrouting-bottom - [0:0]\n-A PREROUTING -j'
' %s-PREROUTING\n-A OUTPUT -j %s-OUTPUT\n-A POSTROUTING '
'-j %s-POSTROUTING\n-A POSTROUTING -j quantum-postroutin'
'g-bottom\n-A quantum-postrouting-bottom -j %s-snat\n-A '
'%s-snat -j %s-float-snat\n' % (bn, bn, bn, bn, bn, bn,
bn, bn, bn, bn, bn))
self.iptables.execute(['/sbin/iptables-restore'],
process_input=(':%s-FORWARD - [0:0]\n:%s-INPUT'
' - [0:0]\n:%s-local - [0:0]\n:%s-filter - [0:'
'0]\n:%s-OUTPUT - [0:0]\n:quantum-filter-top -'
' [0:0]\n-A FORWARD -j quantum-filter-top\n-A '
'OUTPUT -j quantum-filter-top\n-A quantum-filt'
'er-top -j %s-local\n-A INPUT -j %s-INPUT\n-A '
'OUTPUT -j %s-OUTPUT\n-A FORWARD -j %s-FORWARD'
'\n-A %s-filter -j DROP\n-A %s-INPUT -s 0/0 -d'
' 192.168.0.2 -j %s-filter\n' % (bn, bn, bn, bn,
bn, bn, bn, bn, bn, bn, bn, bn)), root_helper=
self.root_helper).AndReturn(None)
self.iptables.execute(['/sbin/iptables-save', '-t', 'nat'],
root_helper=self.root_helper).AndReturn('')
self.iptables.execute(['/sbin/iptables-restore'],
process_input=nat_dump,
root_helper=self.root_helper).AndReturn(None)
self.iptables.execute(['/sbin/iptables-save', '-t', 'filter'],
root_helper=self.root_helper).AndReturn('')
self.iptables.execute(['/sbin/iptables-restore'],
process_input=(':%s-FORWARD - [0:0]\n:%s-INPUT -'
' [0:0]\n:%s-local - [0:0]\n:%s-OUTPUT - [0:0]\n'
':quantum-filter-top - [0:0]\n-A FORWARD -j quan'
'tum-filter-top\n-A OUTPUT -j quantum-filter-top'
'\n-A quantum-filter-top -j %s-local\n-A INPUT -'
'j %s-INPUT\n-A OUTPUT -j %s-OUTPUT\n-A FORWARD '
'-j %s-FORWARD\n' % (bn, bn, bn, bn, bn, bn, bn,
bn)), root_helper=self.root_helper
).AndReturn(None)
self.iptables.execute(['/sbin/iptables-save', '-t', 'nat'],
root_helper=self.root_helper).AndReturn('')
self.iptables.execute(['/sbin/iptables-restore'],
process_input=nat_dump,
root_helper=self.root_helper).AndReturn(None)
self.mox.ReplayAll()
self.iptables.ipv4['filter'].add_chain('filter')
self.iptables.ipv4['filter'].add_rule('filter', '-j DROP')
self.iptables.ipv4['filter'].add_rule('INPUT',
'-s 0/0 -d 192.168.0.2 -j'
' %s-filter' %
(iptables_manager.binary_name))
self.iptables.apply()
self.iptables.ipv4['filter'].remove_rule('filter', '-j DROP')
self.iptables.ipv4['filter'].remove_rule('INPUT',
'-s 0/0 -d 192.168.0.2 -j'
' %s-filter' %
(iptables_manager.
binary_name))
self.iptables.ipv4['filter'].remove_chain('filter')
self.iptables.apply()
self.mox.VerifyAll()
def test_add_nat_rule(self):
bn = iptables_manager.binary_name
filter_dump = (':%s-FORWARD - [0:0]\n:%s-INPUT - [0:0]\n:%s-local - '
'[0:0]\n:%s-OUTPUT - [0:0]\n:quantum-filter-top - [0:'
'0]\n-A FORWARD -j quantum-filter-top\n-A OUTPUT -j q'
'uantum-filter-top\n-A quantum-filter-top -j %s-local'
'\n-A INPUT -j %s-INPUT\n-A OUTPUT -j %s-OUTPUT\n-A F'
'ORWARD -j %s-FORWARD\n' % (bn, bn, bn, bn, bn,
bn, bn, bn))
self.iptables.execute(['/sbin/iptables-save', '-t', 'filter'],
root_helper=self.root_helper).AndReturn('')
self.iptables.execute(['/sbin/iptables-restore'],
process_input=filter_dump,
root_helper=self.root_helper).AndReturn(None)
self.iptables.execute(['/sbin/iptables-save', '-t', 'nat'],
root_helper=self.root_helper).AndReturn('')
self.iptables.execute(['/sbin/iptables-restore'],
process_input=(':%s-float-snat - [0:0]\n:%s-POS'
'TROUTING - [0:0]\n:%s-PREROUTING - [0:0]\n:%s-'
'nat - [0:0]\n:%s-OUTPUT - [0:0]\n:%s-snat - [0'
':0]\n:quantum-postrouting-bottom - [0:0]\n-A P'
'REROUTING -j %s-PREROUTING\n-A OUTPUT -j %s-OU'
'TPUT\n-A POSTROUTING -j %s-POSTROUTING\n-A POS'
'TROUTING -j quantum-postrouting-bottom\n-A qua'
'ntum-postrouting-bottom -j %s-snat\n-A %s-snat'
' -j %s-float-snat\n-A %s-PREROUTING -d 192.168'
'.0.3 -j %s-nat\n-A %s-nat -p tcp --dport 8080 '
'-j REDIRECT --to-port 80\n' % (bn, bn, bn, bn,
bn, bn, bn, bn, bn, bn, bn, bn, bn, bn, bn)),
root_helper=self.root_helper).AndReturn(None)
self.iptables.execute(['/sbin/iptables-save', '-t', 'filter'],
root_helper=self.root_helper).AndReturn('')
self.iptables.execute(['/sbin/iptables-restore'],
process_input=filter_dump,
root_helper=self.root_helper).AndReturn(None)
self.iptables.execute(['/sbin/iptables-save', '-t', 'nat'],
root_helper=self.root_helper).AndReturn('')
self.iptables.execute(['/sbin/iptables-restore'],
process_input=(':%s-float-snat - [0:0]\n:%s-POST'
'ROUTING - [0:0]\n:%s-PREROUTING - [0:0]\n:%s-OU'
'TPUT - [0:0]\n:%s-snat - [0:0]\n:quantum-postro'
'uting-bottom - [0:0]\n-A PREROUTING -j %s-PRERO'
'UTING\n-A OUTPUT -j %s-OUTPUT\n-A POSTROUTING -'
'j %s-POSTROUTING\n-A POSTROUTING -j quantum-pos'
'trouting-bottom\n-A quantum-postrouting-bottom '
'-j %s-snat\n-A %s-snat -j %s-float-snat\n' % (
bn, bn, bn, bn, bn, bn, bn, bn, bn, bn, bn)
), root_helper=self.root_helper).AndReturn(None)
self.mox.ReplayAll()
self.iptables.ipv4['nat'].add_chain('nat')
self.iptables.ipv4['nat'].add_rule('PREROUTING',
'-d 192.168.0.3 -j %s-nat' %
(iptables_manager.binary_name))
self.iptables.ipv4['nat'].add_rule('nat',
'-p tcp --dport 8080' +
' -j REDIRECT --to-port 80')
self.iptables.apply()
self.iptables.ipv4['nat'].remove_rule('nat',
'-p tcp --dport 8080 -j'
' REDIRECT --to-port 80')
self.iptables.ipv4['nat'].remove_rule('PREROUTING',
'-d 192.168.0.3 -j %s-nat' %
(iptables_manager.binary_name))
self.iptables.ipv4['nat'].remove_chain('nat')
self.iptables.apply()
self.mox.VerifyAll()
def test_add_rule_to_a_nonexistent_chain(self):
self.assertRaises(LookupError, self.iptables.ipv4['filter'].add_rule,
'nonexistent', '-j DROP')
def test_remove_nonexistent_chain(self):
self.mox.StubOutWithMock(iptables_manager, "LOG")
iptables_manager.LOG.warn(('Attempted to remove chain %s which does '
'not exist'), 'nonexistent')
self.mox.ReplayAll()
self.iptables.ipv4['filter'].remove_chain('nonexistent')
self.mox.VerifyAll()
def test_remove_nonexistent_rule(self):
self.mox.StubOutWithMock(iptables_manager, "LOG")
iptables_manager.LOG.warn('Tried to remove rule that was not there: '
'%(chain)r %(rule)r %(wrap)r %(top)r',
{'wrap': True, 'top': False,
'rule': '-j DROP',
'chain': 'nonexistent'})
self.mox.ReplayAll()
self.iptables.ipv4['filter'].remove_rule('nonexistent', '-j DROP')
self.mox.VerifyAll()
class IptablesManagerStateLessTestCase(unittest.TestCase):
def setUp(self):
self.iptables = (iptables_manager.IptablesManager(state_less=True))
def test_nat_not_found(self):
self.assertFalse('nat' in self.iptables.ipv4)