| import re |
| |
| |
| class Net: |
| def __init__(self, name): |
| self.name = name |
| self.id = None |
| self.subnet_name = None |
| self.subnet_id = None |
| self.subnet_creation_time = None |
| self.subnet_update_time = None |
| self.gateway_ip = None |
| self.segmentation_id = None # not set |
| self._cidr = None |
| self.start_end_dict = None |
| self._issued_ip_addresses = dict() |
| |
| def get_short_id(self): |
| """ |
| Returns a shortened UUID, with only the first 6 characters. |
| |
| :return: First 6 characters of the UUID |
| :rtype: ``str`` |
| """ |
| return str(self.id)[:6] |
| |
| def get_new_ip_address(self, port_name): |
| """ |
| Calculates the next unused IP Address which belongs to the subnet. |
| |
| :param port_name: Specifies the port. |
| :type port_name: ``str`` |
| :return: Returns a unused IP Address or none if all are in use. |
| :rtype: ``str`` |
| """ |
| if self.start_end_dict is None: |
| return None |
| |
| int_start_ip = Net.ip_2_int(self.start_end_dict['start']) + 2 # First address as network address not usable |
| # Second one is for gateways only |
| int_end_ip = Net.ip_2_int(self.start_end_dict['end']) - 1 # Last address for broadcasts |
| while int_start_ip in self._issued_ip_addresses and int_start_ip <= int_end_ip: |
| int_start_ip += 1 |
| |
| if int_start_ip > int_end_ip: |
| return None |
| |
| self._issued_ip_addresses[int_start_ip] = port_name |
| return Net.int_2_ip(int_start_ip) + '/' + self._cidr.rsplit('/', 1)[1] |
| |
| def assign_ip_address(self, cidr, port_name): |
| """ |
| Assigns the IP address to the port if it is currently NOT used. |
| |
| :param cidr: The cidr used by the port - e.g. 10.0.0.1/24 |
| :type cidr: ``str`` |
| :param port_name: The port name |
| :type port_name: ``str`` |
| :return: * *False*: If the IP address is already issued or if it is not within this subnet mask. |
| * *True*: Else |
| """ |
| int_ip = Net.cidr_2_int(cidr) |
| if int_ip in self._issued_ip_addresses: |
| return False |
| |
| int_start_ip = Net.ip_2_int(self.start_end_dict['start']) + 1 # First address as network address not usable |
| int_end_ip = Net.ip_2_int(self.start_end_dict['end']) - 1 # Last address for broadcasts |
| if int_ip < int_start_ip or int_ip > int_end_ip: |
| return False |
| |
| self._issued_ip_addresses[int_ip] = port_name |
| return True |
| |
| def is_my_ip(self, cidr, port_name): |
| """ |
| Checks if the IP is registered for this port name. |
| |
| :param cidr: The cidr used by the port - e.g. 10.0.0.1/24 |
| :type cidr: ``str`` |
| :param port_name: The port name |
| :type port_name: ``str`` |
| :return: Returns true if the IP address belongs to the port name. Else it returns false. |
| """ |
| int_ip = Net.cidr_2_int(cidr) |
| |
| if not int_ip in self._issued_ip_addresses: |
| return False |
| |
| if self._issued_ip_addresses[int_ip] == port_name: |
| return True |
| return False |
| |
| def withdraw_ip_address(self, ip_address): |
| """ |
| Removes the IP address from the list of issued addresses, thus other ports can use it. |
| |
| :param ip_address: The issued IP address. |
| :type ip_address: ``str`` |
| """ |
| if ip_address is None: |
| return |
| |
| if "/" in ip_address: |
| address, suffix = ip_address.rsplit('/', 1) |
| else: |
| address = ip_address |
| int_ip_address = Net.ip_2_int(address) |
| if int_ip_address in self._issued_ip_addresses.keys(): |
| del self._issued_ip_addresses[int_ip_address] |
| |
| def reset_issued_ip_addresses(self): |
| """ |
| Resets all issued IP addresses. |
| """ |
| self._issued_ip_addresses = dict() |
| |
| def update_port_name_for_ip_address(self, ip_address, port_name): |
| """ |
| Updates the port name of the issued IP address. |
| |
| :param ip_address: The already issued IP address. |
| :type ip_address: ``str`` |
| :param port_name: The new port name |
| :type port_name: ``str`` |
| """ |
| address, suffix = ip_address.rsplit('/', 1) |
| int_ip_address = Net.ip_2_int(address) |
| self._issued_ip_addresses[int_ip_address] = port_name |
| |
| def set_cidr(self, cidr): |
| """ |
| Sets the CIDR for the subnet. It previously checks for the correct CIDR format. |
| |
| :param cidr: The new CIDR for the subnet. |
| :type cidr: ``str`` |
| :return: * *True*: When the new CIDR was set successfully. |
| * *False*: If the CIDR format was wrong. |
| :rtype: ``bool`` |
| """ |
| if cidr is None: |
| if self._cidr is not None: |
| import emuvim.api.openstack.ip_handler as IP |
| IP.free_cidr(self._cidr, self.subnet_id) |
| self._cidr = None |
| self.reset_issued_ip_addresses() |
| self.start_end_dict = dict() |
| return True |
| if not Net.check_cidr_format(cidr): |
| return False |
| |
| self.reset_issued_ip_addresses() |
| self.start_end_dict = Net.calculate_start_and_end_dict(cidr) |
| self._cidr = cidr |
| return True |
| |
| def get_cidr(self): |
| """ |
| Gets the CIDR. |
| |
| :return: The CIDR |
| :rtype: ``str`` |
| """ |
| return self._cidr |
| |
| def clear_cidr(self): |
| self._cidr = None |
| self.start_end_dict = dict() |
| self.reset_issued_ip_addresses() |
| |
| def delete_subnet(self): |
| self.subnet_id = None |
| self.subnet_name = None |
| self.subnet_creation_time = None |
| self.subnet_update_time = None |
| self.set_cidr(None) |
| |
| @staticmethod |
| def calculate_start_and_end_dict(cidr): |
| """ |
| Calculates the start and end IP address for the subnet. |
| |
| :param cidr: The CIDR for the subnet. |
| :type cidr: ``str`` |
| :return: Dict with start and end ip address |
| :rtype: ``dict`` |
| """ |
| address, suffix = cidr.rsplit('/', 1) |
| int_suffix = int(suffix) |
| int_address = Net.ip_2_int(address) |
| address_space = 2 ** 32 - 1 |
| |
| for x in range(0, 31 - int_suffix): |
| address_space = ~(~address_space | (1 << x)) |
| |
| start = int_address & address_space |
| end = start + (2 ** (32 - int_suffix) - 1) |
| |
| return {'start': Net.int_2_ip(start), 'end': Net.int_2_ip(end)} |
| |
| @staticmethod |
| def cidr_2_int(cidr): |
| if cidr is None: |
| return None |
| ip = cidr.rsplit('/', 1)[0] |
| return Net.ip_2_int(ip) |
| |
| @staticmethod |
| def ip_2_int(ip): |
| """ |
| Converts a IP address to int. |
| |
| :param ip: IP address |
| :type ip: ``str`` |
| :return: IP address as int. |
| :rtype: ``int`` |
| """ |
| o = map(int, ip.split('.')) |
| res = (16777216 * o[0]) + (65536 * o[1]) + (256 * o[2]) + o[3] |
| return res |
| |
| @staticmethod |
| def int_2_ip(int_ip): |
| """ |
| Converts a int IP address to string. |
| |
| :param int_ip: Int IP address. |
| :type int_ip: ``int`` |
| :return: IP address |
| :rtype: ``str`` |
| """ |
| o1 = int(int_ip / 16777216) % 256 |
| o2 = int(int_ip / 65536) % 256 |
| o3 = int(int_ip / 256) % 256 |
| o4 = int(int_ip) % 256 |
| return '%(o1)s.%(o2)s.%(o3)s.%(o4)s' % locals() |
| |
| @staticmethod |
| def check_cidr_format(cidr): |
| """ |
| Checks the CIDR format. An valid example is: 192.168.0.0/29 |
| |
| :param cidr: CIDR to be checked. |
| :type cidr: ``str`` |
| :return: * *True*: If the Format is correct. |
| * *False*: If it is not correct. |
| :rtype: ``bool`` |
| """ |
| r = re.compile('\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/\d{2}') |
| if r.match(cidr): |
| return True |
| return False |
| |
| def create_network_dict(self): |
| """ |
| Creates the network description dictionary. |
| |
| :return: Network description. |
| :rtype: ``dict`` |
| """ |
| network_dict = dict() |
| network_dict["status"] = "ACTIVE" # TODO do we support inactive networks? |
| if self.subnet_id == None: |
| network_dict["subnets"] = [] |
| else: |
| network_dict["subnets"] = [self.subnet_id] |
| network_dict["name"] = self.name |
| network_dict["admin_state_up"] = True # TODO is it always true? |
| network_dict["tenant_id"] = "abcdefghijklmnopqrstuvwxyz123456" # TODO what should go in here |
| network_dict["id"] = self.id |
| network_dict["shared"] = False # TODO is it always false? |
| return network_dict |
| |
| def create_subnet_dict(self): |
| """ |
| Creates the subnet description dictionary. |
| |
| :return: Subnet description. |
| :rtype: ``dict`` |
| """ |
| subnet_dict = dict() |
| subnet_dict["name"] = self.subnet_name |
| subnet_dict["network_id"] = self.id |
| subnet_dict["tenant_id"] = "abcdefghijklmnopqrstuvwxyz123456" # TODO what should go in here? |
| subnet_dict["created_at"] = self.subnet_creation_time |
| subnet_dict["dns_nameservers"] = [] |
| subnet_dict["allocation_pools"] = [self.start_end_dict] |
| subnet_dict["host_routers"] = [] |
| subnet_dict["gateway_ip"] = self.gateway_ip |
| subnet_dict["ip_version"] = "4" |
| subnet_dict["cidr"] = self.get_cidr() |
| subnet_dict["updated_at"] = self.subnet_update_time |
| subnet_dict["id"] = self.subnet_id |
| subnet_dict["enable_dhcp"] = False # TODO do we support DHCP? |
| return subnet_dict |
| |
| def __eq__(self, other): |
| if self.name == other.name and self.subnet_name == other.subnet_name and \ |
| self.gateway_ip == other.gateway_ip and \ |
| self.segmentation_id == other.segmentation_id and \ |
| self._cidr == other._cidr and \ |
| self.start_end_dict == other.start_end_dict: |
| return True |
| return False |
| |
| def __hash__(self): |
| return hash((self.name, |
| self.subnet_name, |
| self.gateway_ip, |
| self.segmentation_id, |
| self._cidr, |
| self.start_end_dict)) |