subnets.py 8.89 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
# Copyright 2013 GRNET S.A. All rights reserved.
#
# Redistribution and use in source and binary forms, with or
# without modification, are permitted provided that the following
# conditions are met:
#
#   1. Redistributions of source code must retain the above
#      copyright notice, this list of conditions and the following
#      disclaimer.
#
#   2. Redistributions in binary form must reproduce the above
#      copyright notice, this list of conditions and the following
#      disclaimer in the documentation and/or other materials
#      provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# The views and conclusions contained in the software and
# documentation are those of the authors and should not be
# interpreted as representing official policies, either expressed
# or implied, of GRNET S.A.

from logging import getLogger
from snf_django.lib import api

37
from django.conf.urls import patterns
38
39
40
41
from django.http import HttpResponse
from django.utils import simplejson as json

from snf_django.lib.api import utils
42
#from synnefo.db.models import Subnet
43
from synnefo.logic import subnets
44
from synnefo.api import util
45

46
import ipaddr
47
48
49
50

log = getLogger(__name__)


51
52
53
54
55
56
urlpatterns = patterns(
    'synnefo.api.subnets',
    (r'^(?:/|.json|.xml)?$', 'demux'),
    (r'^/([-\w]+)(?:/|.json|.xml)?$', 'subnet_demux'))


57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
def demux(request):
    if request.method == 'GET':
        return list_subnets(request)
    elif request.method == 'POST':
        return create_subnet(request)
    else:
        return api.api_method_not_allowed(request)


def subnet_demux(request, sub_id):
    if request.method == 'GET':
        return get_subnet(request, sub_id)
    elif request.method == 'DELETE':
        return delete_subnet(request, sub_id)
    elif request.method == 'PUT':
        return update_subnet(request, sub_id)
    else:
        return api.api_method_not_allowed(request)


@api.api_method(http_method='GET', user_required=True, logger=log)
def list_subnets(request):
    """List all subnets of a user"""
80
81
82
83
    subnet_list = subnets.list_subnets(request.user_uniq)
    subnets_dict = [subnet_to_dict(sub)
                    for sub in subnet_list.order_by('id')]

84
85
86
87
88
89
90
    data = json.dumps({'subnets': subnets_dict})

    return HttpResponse(data, status=200)


@api.api_method(http_method='POST', user_required=True, logger=log)
def create_subnet(request):
91
    """Create a subnet
92
    network_id and the desired cidr are mandatory, everything else is optional
93

94
    """
95
96
97
98
99
100
101
102
103
104
    dictionary = utils.get_request_dict(request)
    log.info('create subnet %s', dictionary)

    try:
        subnet = dictionary['subnet']
        network_id = subnet['network_id']
        cidr = subnet['cidr']
    except KeyError:
        raise api.faults.BadRequest("Malformed request")

105
106
    name = subnet.get('name', None)
    ipversion = subnet.get('ip_version', 4)
107

108
109
110
111
    allocation_pools = subnet.get('allocation_pools', None)
    if allocation_pools is not None:
        allocation_pools = parse_ip_pools(allocation_pools)

112
113
114
    try:
        cidr_ip = ipaddr.IPNetwork(cidr)
    except ValueError:
115
        raise api.faults.BadRequest("Malformed CIDR '%s'" % cidr)
116

117
118
119
    # If no gateway is specified, send an empty string, because None is used
    # if the user wants no gateway at all
    gateway = subnet.get('gateway_ip', "")
120
    if gateway is "":
121
        gateway = str(cidr_ip.network + 1)
122

123
    dhcp = subnet.get('enable_dhcp', True)
124
125
126
127
128
129
130
131
132
133
    slaac = subnet.get('enable_slaac', None)

    if ipversion == 6:
        if slaac is not None:
            dhcp = check_boolean_value(slaac, "enable_slaac")
        else:
            dhcp = check_boolean_value(dhcp, "dhcp")
    else:
        dhcp = check_boolean_value(dhcp, "dhcp")

134
135
136
    dns = subnet.get('dns_nameservers', None)
    hosts = subnet.get('host_routes', None)

137
138
139
140
141
142
    sub = subnets.create_subnet(network_id=network_id,
                                cidr=cidr,
                                name=name,
                                ipversion=ipversion,
                                gateway=gateway,
                                dhcp=dhcp,
143
                                slaac=slaac,
144
145
146
147
                                dns_nameservers=dns,
                                allocation_pools=allocation_pools,
                                host_routes=hosts,
                                user_id=request.user_uniq)
148
149
150
151
152
153
154
155
156
157

    subnet_dict = subnet_to_dict(sub)
    data = json.dumps({'subnet': subnet_dict})
    return HttpResponse(data, status=200)


@api.api_method(http_method='GET', user_required=True, logger=log)
def get_subnet(request, sub_id):
    """Show info of a specific subnet"""
    user_id = request.user_uniq
158
    subnet = subnets.get_subnet(sub_id)
159

160
    if (subnet.network.userid != user_id) and (subnet.network.public is False):
161
        raise api.faults.Unauthorized("You're not allowed to view this subnet")
162

163
    subnet_dict = subnet_to_dict(subnet)
164
165
166
167
168
169
    data = json.dumps({'subnet': subnet_dict})
    return HttpResponse(data, status=200)


@api.api_method(http_method='DELETE', user_required=True, logger=log)
def delete_subnet(request, sub_id):
170
    """Delete a subnet, raises BadRequest
171
    A subnet is deleted ONLY when the network that it belongs to is deleted
172

173
174
175
176
177
178
    """
    raise api.faults.BadRequest("Deletion of a subnet is not supported")


@api.api_method(http_method='PUT', user_required=True, logger=log)
def update_subnet(request, sub_id):
179
    """Update the fields of a subnet
180
    Only the name can be updated, everything else returns BadRequest
181

182
183
184
185
186
187
188
189
190
191
    """

    dictionary = utils.get_request_dict(request)
    user_id = request.user_uniq

    try:
        subnet = dictionary['subnet']
    except KeyError:
        raise api.faults.BadRequest("Malformed request")

192
    if len(subnet) != 1 or "name" not in subnet:
193
194
195
196
        raise api.faults.BadRequest("Only the name of subnet can be updated")

    name = subnet.get("name", None)

197
    subnet_dict = subnet_to_dict(subnets.update_subnet(sub_id, name, user_id))
198
199
200
201
202
203
204
    data = json.dumps({'subnet': subnet_dict})
    return HttpResponse(data, status=200)


#Utility functions
def subnet_to_dict(subnet):
    """Returns a dictionary containing the info of a subnet"""
205
206
    dns = check_empty_lists(subnet.dns_nameservers)
    hosts = check_empty_lists(subnet.host_routes)
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223

    allocation_pools = [render_ip_pool(pool)
                        for pool in subnet.ip_pools.all()]

    network = subnet.network
    d = {'id': str(subnet.id),
         'network_id': str(network.id),
         'name': subnet.name if subnet.name is not None else "",
         'tenant_id': network.userid,
         'user_id': network.userid,
         'gateway_ip': subnet.gateway,
         'ip_version': subnet.ipversion,
         'cidr': subnet.cidr,
         'enable_dhcp': subnet.dhcp,
         'dns_nameservers': dns,
         'host_routes': hosts,
         'allocation_pools': allocation_pools}
224
225

    if subnet.ipversion == 6:
226
227
228
        d['enable_slaac'] = subnet.dhcp

    d['links'] = util.subnet_to_links(subnet.id)
229

230
    return d
231
232


233
234
235
236
237
238
239
240
241
242
def render_ip_pool(pool):
    network = ipaddr.IPNetwork(pool.base).network
    start = str(network + pool.offset)
    end = str(network + pool.offset + pool.size - 1)
    return {"start": start, "end": end}


def parse_ip_pools(pools):
    """Convert [{'start': '192.168.42.1', 'end': '192.168.42.15'},
             {'start': '192.168.42.30', 'end': '192.168.42.60'}]
243
    to
244
245
            [(IPv4Address("192.168.42.1"), IPv4Address("192.168.42.15")),
             (IPv4Address("192.168.42.30"), IPv4Address("192.168.42.60"))]
246

247
    """
248
249
250
251
252
253
254
255
    try:
        return sorted([(ipaddr.IPv4Address(p["start"]),
                        ipaddr.IPv4Address(p["end"])) for p in pools])
    except KeyError:
        raise api.faults.BadRequest("Malformed allocation pool.")
    except ipaddr.AddressValueError:
        raise api.faults.BadRequest("Allocation pools contain invalid IPv4"
                                    " address")
256
257


258
259
260
261
262
263
264
def check_empty_lists(value):
    """Check if value is Null/None, in which case we return an empty list"""
    if value is None:
        return []
    return value


265
266
267
268
269
270
def check_boolean_value(value, key):
    """Check if dhcp value is in acceptable values"""
    if value not in [True, False]:
        raise api.faults.BadRequest("Malformed request, %s must "
                                    "be True or False" % key)
    return value