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import pytest
from mock import Mock, patch, call
import socket
from socket import AF_INET, AF_INET6
import struct
from sshuttle.helpers import Fatal
from sshuttle.methods import get_method
def test_get_supported_features():
method = get_method('nat')
features = method.get_supported_features()
assert not features.ipv6
assert not features.udp
assert features.dns
def test_get_tcp_dstip():
sock = Mock()
sock.getsockopt.return_value = struct.pack(
'!HHBBBB', socket.ntohs(AF_INET), 1024, 127, 0, 0, 1)
method = get_method('nat')
assert method.get_tcp_dstip(sock) == ('127.0.0.1', 1024)
assert sock.mock_calls == [call.getsockopt(0, 80, 16)]
def test_recv_udp():
sock = Mock()
sock.recvfrom.return_value = "11111", "127.0.0.1"
method = get_method('nat')
result = method.recv_udp(sock, 1024)
assert sock.mock_calls == [call.recvfrom(1024)]
assert result == ("127.0.0.1", None, "11111")
def test_send_udp():
sock = Mock()
method = get_method('nat')
method.send_udp(sock, None, "127.0.0.1", "22222")
assert sock.mock_calls == [call.sendto("22222", "127.0.0.1")]
def test_setup_tcp_listener():
listener = Mock()
method = get_method('nat')
method.setup_tcp_listener(listener)
assert listener.mock_calls == []
def test_setup_udp_listener():
listener = Mock()
method = get_method('nat')
method.setup_udp_listener(listener)
assert listener.mock_calls == []
def test_assert_features():
method = get_method('nat')
features = method.get_supported_features()
method.assert_features(features)
features.udp = True
with pytest.raises(Fatal):
method.assert_features(features)
features.ipv6 = True
with pytest.raises(Fatal):
method.assert_features(features)
def test_firewall_command():
method = get_method('nat')
assert not method.firewall_command("somthing")
@patch('sshuttle.methods.nat.ipt')
@patch('sshuttle.methods.nat.ipt_ttl')
@patch('sshuttle.methods.nat.ipt_chain_exists')
def test_setup_firewall(mock_ipt_chain_exists, mock_ipt_ttl, mock_ipt):
mock_ipt_chain_exists.return_value = True
method = get_method('nat')
assert method.name == 'nat'
with pytest.raises(Exception) as excinfo:
method.setup_firewall(
1024, 1026,
[(AF_INET6, u'2404:6800:4004:80c::33')],
AF_INET6,
[(AF_INET6, 64, False, u'2404:6800:4004:80c::', 0, 0),
(AF_INET6, 128, True, u'2404:6800:4004:80c::101f', 80, 80)],
True,
None)
assert str(excinfo.value) \
== 'Address family "AF_INET6" unsupported by nat method_name'
assert mock_ipt_chain_exists.mock_calls == []
assert mock_ipt_ttl.mock_calls == []
assert mock_ipt.mock_calls == []
with pytest.raises(Exception) as excinfo:
method.setup_firewall(
1025, 1027,
[(AF_INET, u'1.2.3.33')],
AF_INET,
[(AF_INET, 24, False, u'1.2.3.0', 8000, 9000),
(AF_INET, 32, True, u'1.2.3.66', 8080, 8080)],
True,
None)
assert str(excinfo.value) == 'UDP not supported by nat method_name'
assert mock_ipt_chain_exists.mock_calls == []
assert mock_ipt_ttl.mock_calls == []
assert mock_ipt.mock_calls == []
method.setup_firewall(
1025, 1027,
[(AF_INET, u'1.2.3.33')],
AF_INET,
[(AF_INET, 24, False, u'1.2.3.0', 8000, 9000),
(AF_INET, 32, True, u'1.2.3.66', 8080, 8080)],
False,
None)
assert mock_ipt_chain_exists.mock_calls == [
call(AF_INET, 'nat', 'sshuttle-1025')
]
assert mock_ipt_ttl.mock_calls == [
call(AF_INET, 'nat', '-A', 'sshuttle-1025', '-j', 'REDIRECT',
'--dest', u'1.2.3.0/24', '-p', 'tcp', '--dport', '8000:9000',
'--to-ports', '1025'),
call(AF_INET, 'nat', '-A', 'sshuttle-1025', '-j', 'REDIRECT',
'--dest', u'1.2.3.33/32', '-p', 'udp',
'--dport', '53', '--to-ports', '1027')
]
assert mock_ipt.mock_calls == [
call(AF_INET, 'nat', '-D', 'OUTPUT', '-j', 'sshuttle-1025'),
call(AF_INET, 'nat', '-D', 'PREROUTING', '-j', 'sshuttle-1025'),
call(AF_INET, 'nat', '-F', 'sshuttle-1025'),
call(AF_INET, 'nat', '-X', 'sshuttle-1025'),
call(AF_INET, 'nat', '-N', 'sshuttle-1025'),
call(AF_INET, 'nat', '-F', 'sshuttle-1025'),
call(AF_INET, 'nat', '-I', 'OUTPUT', '1', '-j', 'sshuttle-1025'),
call(AF_INET, 'nat', '-I', 'PREROUTING', '1', '-j', 'sshuttle-1025'),
call(AF_INET, 'nat', '-A', 'sshuttle-1025', '-j', 'RETURN',
'--dest', u'1.2.3.66/32', '-p', 'tcp', '--dport', '8080:8080')
]
mock_ipt_chain_exists.reset_mock()
mock_ipt_ttl.reset_mock()
mock_ipt.reset_mock()
method.restore_firewall(1025, AF_INET, False, None)
assert mock_ipt_chain_exists.mock_calls == [
call(AF_INET, 'nat', 'sshuttle-1025')
]
assert mock_ipt_ttl.mock_calls == []
assert mock_ipt.mock_calls == [
call(AF_INET, 'nat', '-D', 'OUTPUT', '-j', 'sshuttle-1025'),
call(AF_INET, 'nat', '-D', 'PREROUTING', '-j', 'sshuttle-1025'),
call(AF_INET, 'nat', '-F', 'sshuttle-1025'),
call(AF_INET, 'nat', '-X', 'sshuttle-1025')
]
mock_ipt_chain_exists.reset_mock()
mock_ipt_ttl.reset_mock()
mock_ipt.reset_mock()
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