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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
class IPAddressField(models.CharField):
"""
Field class for rpki.POW.IPAddress, stored as zero-padded
hexadecimal so lexicographic order is identical to numeric order.
"""
# Django's CharField type doesn't distinguish between the length
# of the human readable form and the length of the storage form,
# so we have to leave room for IPv6 punctuation even though we
# only store hexadecimal digits and thus will never use the full
# width of the database field. Price we pay for portability.
#
# Documentation on the distinction between the various conversion
# methods is fairly opaque, to put it politely, and we have to
# handle database engines which sometimes return buffers or other
# classes instead of strings, so the conversions are a bit
# finicky. If this goes haywire, your best bet is probably to
# litter the code with logging.debug() calls and debug by printf.
def __init__(self, *args, **kwargs):
kwargs["max_length"] = 40
super(IPAddressField, self).__init__(*args, **kwargs)
def deconstruct(self):
name, path, args, kwargs = super(IPAddressField, self).deconstruct()
del kwargs["max_length"]
return name, path, args, kwargs
@staticmethod
def _value_to_ipaddress(value):
if value is None or isinstance(value, rpki.POW.IPAddress):
return value
value = str(value)
if ":" in value or "." in value:
return rpki.POW.IPAddress(value)
else:
return rpki.POW.IPAddress.fromBytes(value.decode("hex"))
def from_db_value(self, value, expression, connection, context):
# Can't use super() here, see Django documentation.
return self._value_to_ipaddress(value)
def to_python(self, value):
return self._value_to_ipaddress(
super(IPAddressField, self).to_python(value))
@staticmethod
def _hex_from_ipaddress(value):
if isinstance(value, rpki.POW.IPAddress):
return value.toBytes().encode("hex")
else:
return value
def get_prep_value(self, value):
return super(IPAddressField, self).get_prep_value(
self._hex_from_ipaddress(value))
def get_db_prep_value(self, value, connection, prepared = False):
return self._hex_from_ipaddress(
super(IPAddressField, self).get_db_prep_value(value, connection, prepared))
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 = IPAddressField(db_index=True, null=False)
prefix_max = IPAddressField(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 = IPAddressField(db_index=True, null=False)
prefix_max = IPAddressField(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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