def test_change_ap_vpn_no_clash(self):
""" attaches a user AS with VPN from one AP to another AP, checks port clashes """
seed = 6
ap1 = AS.objects.get(as_id=testtopo_vpns_as_ids[0])
ap2 = AS.objects.get(as_id=testtopo_vpns_as_ids[1])
# create two user ases:
user_as1, att_confs1 = create_and_check_random_useras(
self, seed + 1, [ap1.as_id], VPNChoice.ALL)
user_as2, _ = create_and_check_random_useras(self, seed + 2,
[ap2.as_id],
VPNChoice.ALL)
# ensure that we use the same public port on the server side:
ap_public_port = 55555
# unlikely to already be in use, check anyway (testing the test):
assert ap_public_port not in value_set(ap1.hosts.get().interfaces,
'public_port')
assert ap_public_port not in value_set(ap2.hosts.get().interfaces,
'public_port')
# now set the public port on AP side for both user-AS - AP links.
user_as1.interfaces.get().remote_interface().update(
public_port=ap_public_port)
user_as2.interfaces.get().remote_interface().update(
public_port=ap_public_port)
# switch user_as1 from AP1 to AP2 and check the correctness of the topology,
# in particular, the ports must not clash.
att_confs1[0].attachment_point = ap2.attachment_point_info
att_confs1[0].link.refresh_from_db()
update_useras(self, user_as1, att_confs1)
def _find_client_ip(self):
used_ips = {self.server_vpn_ip} | value_set(VPNClient.objects.filter(vpn=self), 'ip')
subnet = ipaddress.ip_network(self.subnet)
for ip in subnet.hosts():
if str(ip) not in used_ips:
return ip
raise RuntimeError('No free client IP available')
def _find_vpn_subnet(self):
"""
Find the next free IP subnet in form 10.10.x.0/24
"""
existing_vpns = value_set(VPN.objects.all(), 'subnet')
return find_free_subnet(ipaddress.ip_network('10.10.0.0/16'), 24,
existing_vpns)
def find_public_port(self):
"""
Find an unused public port for an AS interface on this Host
"""
used_ports = value_set(self.interfaces, 'public_port')
for candidate_port in range(DEFAULT_PUBLIC_PORT, MAX_PORT):
if candidate_port not in used_ports:
return candidate_port
def find_interface_id(self):
"""
Find an unused interface id
"""
existing_ids = value_set(self.interfaces, 'interface_id')
for candidate_id in range(1, MAX_INTERFACE_ID):
if candidate_id not in existing_ids:
return candidate_id
raise RuntimeError('Interface IDs exhausted')