Synnefo

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from optparse import make_option

from django.core.management.base import BaseCommand, CommandError

from synnefo.db.models import Network, Backend

from synnefo.api.util import net_resources, validate_network_size

from synnefo.logic.backend import create_network

from synnefo import settings

import ipaddr

NETWORK_TYPES = ['PUBLIC_ROUTED', 'PRIVATE_MAC_FILTERED',

                 'PRIVATE_PHYSICAL_VLAN', 'CUSTOM_ROUTED',

                 'CUSTOM_BRIDGED']

class Command(BaseCommand):

    can_import_settings = True

    output_transaction = True

    help = "Create a new network"

    option_list = BaseCommand.option_list + (

        make_option('--name',

            dest='name',

            help="Name of network"),

        make_option('--owner',

            dest='owner',

            help="The owner of the network"),

        make_option('--subnet',

            dest='subnet',

            default=None,

            # required=True,

            help='Subnet of the network'),

        make_option('--gateway',

            dest='gateway',

            default=None,

            help='Gateway of the network'),

        make_option('--dhcp',

            dest='dhcp',

            action='store_true',

            default=False,

            help='Automatically assign IPs'),

        make_option('--public',

            dest='public',

            action='store_true',

            default=False,

            help='Network is public'),

        make_option('--type',

            dest='type',

            default='PRIVATE_MAC_FILTERED',

            choices=NETWORK_TYPES,

            help='Type of network. Choices: ' + ', '.join(NETWORK_TYPES)),

        make_option('--subnet6',

            dest='subnet6',

            default=None,

            help='IPv6 subnet of the network'),

        make_option('--gateway6',

            dest='gateway6',

            default=None,

            help='IPv6 gateway of the network'),

        make_option('--backend-id',

            dest='backend_id',

            default=None,

            help='ID of the backend that the network will be created. Only for'

                 ' public networks')

        )

    def handle(self, *args, **options):

        if args:

            raise CommandError("Command doesn't accept any arguments")

        name = options['name']

        subnet = options['subnet']

        net_type = options['type']

        backend_id = options['backend_id']

        public = options['public']

        if not name:

            raise CommandError("Name is required")

        if not subnet:

            raise CommandError("Subnet is required")

        if public and not backend_id:

            raise CommandError("backend-id is required")

        if public and not net_type == 'PUBLIC_ROUTED':

            raise CommandError("Invalid type for public network")

        if backend_id and not public:

            raise CommandError("Private networks must be created to"

                               " all backends")

        if backend_id:

            try:

                backend_id = int(backend_id)

                backend = Backend.objects.get(id=backend_id)

            except ValueError:

                raise CommandError("Invalid backend ID")

            except Backend.DoesNotExist:

                raise CommandError("Backend not found in DB")

        link, mac_prefix = net_resources(net_type)

        subnet, gateway, subnet6, gateway6 = validate_network_info(options)

        if not link:

            raise CommandError("Can not create network. No connectivity link")

        network = Network.objects.create(

                name=name,

                userid=options['owner'],

                subnet=subnet,

                gateway=gateway,

                dhcp=options['dhcp'],

                type=net_type,

                public=public,

                link=link,

                mac_prefix=mac_prefix,

                gateway6=gateway6,

                subnet6=subnet6,

                state='PENDING')

        if public:

            # Create BackendNetwork only to the specified Backend

            network.create_backend_network(backend)

            create_network(network, backends=[backend])

        else:

            # Create BackendNetwork entries for all Backends

            network.create_backend_network()

            create_network(network)

def validate_network_info(options):

    subnet = options['subnet']

    gateway = options['gateway']

    subnet6 = options['subnet6']

    gateway6 = options['gateway6']

    try:

        net = ipaddr.IPv4Network(subnet)

        prefix = net.prefixlen

        if not validate_network_size(prefix):

            raise CommandError("Unsupport network mask %d."

                               " Must be in range (%s,29] "

                               % (prefix, settings.MAX_CIDR_BLOCK))

    except ValueError:

        raise CommandError('Malformed subnet')

    try:

        gateway and ipaddr.IPv4Address(gateway) or None

    except ValueError:

        raise CommandError('Malformed gateway')

    try:

        subnet6 and ipaddr.IPv6Network(subnet6) or None

    except ValueError:

        raise CommandError('Malformed subnet6')

    try:

        gateway6 and ipaddr.IPv6Address(gateway6) or None

    except ValueError:

        raise CommandError('Malformed gateway6')

    return subnet, gateway, subnet6, gateway6