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# Copyright (C) 2012 SPARTA, Inc. a Parsons Company
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND SPARTA DISCLAIMS ALL WARRANTIES WITH
# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS. IN NO EVENT SHALL SPARTA BE LIABLE FOR ANY SPECIAL, DIRECT,
# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
# OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
# PERFORMANCE OF THIS SOFTWARE.
"""
Common classes for reuse in apps.
"""
__version__ = '$Id$'
from django.db import models
import rpki.resource_set
import rpki.POW
from south.modelsinspector import add_introspection_rules
class IPv6AddressField(models.Field):
"Field large enough to hold a 128-bit unsigned integer."
__metaclass__ = models.SubfieldBase
def db_type(self, connection):
return 'binary(16)'
def to_python(self, value):
if isinstance(value, rpki.POW.IPAddress):
return value
return rpki.POW.IPAddress.fromBytes(value)
def get_db_prep_value(self, value, connection, prepared):
"""
Note that we add a custom conversion to encode long values as hex
strings in SQL statements. See settings.get_conv() for details.
"""
return value.toBytes()
class IPv4AddressField(models.Field):
"Wrapper around rpki.POW.IPAddress."
__metaclass__ = models.SubfieldBase
def db_type(self, connection):
return 'int UNSIGNED'
def to_python(self, value):
if isinstance(value, rpki.POW.IPAddress):
return value
return rpki.POW.IPAddress(value, version=4)
def get_db_prep_value(self, value, connection, prepared):
return long(value)
add_introspection_rules(
[
([IPv4AddressField, IPv6AddressField], [], {})
],
['^rpki\.gui\.models\.IPv4AddressField',
'^rpki\.gui\.models\.IPv6AddressField']
)
class Prefix(models.Model):
"""Common implementation for models with an IP address range.
Expects that `range_cls` is set to the appropriate subclass of
rpki.resource_set.resource_range_ip."""
def as_resource_range(self):
"""
Returns the prefix as a rpki.resource_set.resource_range_ip object.
"""
return self.range_cls(self.prefix_min, self.prefix_max)
@property
def prefixlen(self):
"Returns the prefix length for the prefix in this object."
return self.as_resource_range().prefixlen()
def get_prefix_display(self):
"Return a string representatation of this IP prefix."
return str(self.as_resource_range())
def __unicode__(self):
"""This method may be overridden by subclasses. The default
implementation calls get_prefix_display(). """
return self.get_prefix_display()
class Meta:
abstract = True
# default sort order reflects what "sh ip bgp" outputs
ordering = ('prefix_min',)
class PrefixV4(Prefix):
"IPv4 Prefix."
range_cls = rpki.resource_set.resource_range_ipv4
prefix_min = IPv4AddressField(db_index=True, null=False)
prefix_max = IPv4AddressField(db_index=True, null=False)
class Meta(Prefix.Meta):
abstract = True
class PrefixV6(Prefix):
"IPv6 Prefix."
range_cls = rpki.resource_set.resource_range_ipv6
prefix_min = IPv6AddressField(db_index=True, null=False)
prefix_max = IPv6AddressField(db_index=True, null=False)
class Meta(Prefix.Meta):
abstract = True
class ASN(models.Model):
"""Represents a range of ASNs.
This model is abstract, and is intended to be reused by applications."""
min = models.PositiveIntegerField(null=False)
max = models.PositiveIntegerField(null=False)
class Meta:
abstract = True
ordering = ('min', 'max')
def as_resource_range(self):
return rpki.resource_set.resource_range_as(self.min, self.max)
def __unicode__(self):
return u'AS%s' % self.as_resource_range()
# vim:sw=4 ts=8 expandtab
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