Timotej Lazar
036f7c8b74
Like allowed_prefixes, but for single IP addresses. Currently used just for DHCP server to allow (only) packets from relays.
59 lines
2.5 KiB
Python
59 lines
2.5 KiB
Python
#!/usr/bin/python
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import ipaddress
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import os
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import pynetbox
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class FilterModule(object):
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'''Various utilities for manipulating NetBox data'''
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def __init__(self):
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if 'NETBOX_API' in os.environ and 'NETBOX_TOKEN' in os.environ:
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self.nb = pynetbox.api(os.getenv('NETBOX_API'), os.getenv('NETBOX_TOKEN'))
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def filters(self):
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return {
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'device_address': self.device_address,
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'compact_numlist': self.compact_numlist,
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'allowed_prefixes': self.allowed_prefixes
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}
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def device_address(self, device):
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'''Return loopback IP addresses for an L3 attached device'''
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for iface in device['interfaces']:
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for addr in iface['ip_addresses']:
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if addr.get('role') and addr['role'].get('value') == 'loopback':
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yield addr
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def compact_numlist(self, nums, delimiter=',', range_delimiter='-'):
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'''Transform [1,2,3,5,7,8,9] into "1-3,5,7-9"'''
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i = 0
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spans = []
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while i < len(nums):
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j = i + 1
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while j < len(nums) and nums[j]-nums[i] == j-i:
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j += 1
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spans += [f'{nums[i]}{range_delimiter}{nums[j-1]}' if j > i+1 else f'{nums[i]}']
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i = j
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return delimiter.join(spans)
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def allowed_prefixes(self, service):
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'''Return a list of allowed IP prefixes for the given service'''
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# Depending on how service was obtained, actual data might be nested under custom_fields.
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if 'custom_fields' in service:
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service = service['custom_fields']
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def ip2str(address, single=False):
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if single: # 1.2.3.4/24 → 1.2.3.4
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address = ipaddress.ip_interface(address).ip
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return str(ipaddress.ip_interface(address))
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if ips := service.get('allowed_ips'):
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yield from (ip2str(ip['address'], single=True) for ip in ips)
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if prefixes := service.get('allowed_prefixes'):
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yield from (ip2str(e.prefix) for e in self.nb.ipam.prefixes.filter(id=[prefix['id'] for prefix in prefixes]))
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if vlans := service.get('allowed_vlans'):
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yield from (ip2str(e.prefix) for e in self.nb.ipam.prefixes.filter(vlan_id=[vlan['id'] for vlan in vlans]))
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if clusters := service.get('allowed_clusters'):
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for device in self.nb.dcim.devices.filter(cluster_id=[cluster['id'] for cluster in clusters]):
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yield from (ip2str(e.address) for e in self.nb.ipam.ip_addresses.filter(role='loopback', device_id=device.id))
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