HBLink/acl.py

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###############################################################################
# Copyright (C) 2018 Cortney T. Buffington, N0MJS <n0mjs@me.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
###############################################################################
from dmr_utils.utils import int_id
# Lowest possible Subscirber and/or talkgroup IDs allowed by ETSI standard
ID_MIN = 1
ID_MAX = 16776415
# Checks the supplied ID against the ID given, and the ACL list, and the action
# Returns True if the ID should be allowed, False if it should not be
def acl_check(_id, _acl):
id = int_id(_id)
for entry in _acl[1]:
if entry[0] <= id <= entry[1]:
return _acl[0]
return not _acl[0]
def acl_build(_acl):
if not _acl:
return(True, set((ID_MIN, ID_MAX)))
acl = set()
sections = _acl.split(':')
if sections[0] == 'PERMIT':
action = True
else:
action = False
for entry in sections[1].split(','):
if entry == 'ALL':
acl.add((ID_MIN, ID_MAX))
break
elif '-' in entry:
start,end = entry.split('-')
start,end = int(start), int(end)
if (ID_MIN <= start <= ID_MAX) or (ID_MIN <= end <= ID_MAX):
acl.add((start, end))
else:
pass #logger message here
else:
id = int(entry)
if (ID_MIN <= id <= ID_MAX):
acl.add((id, id))
else:
pass #logger message here
return (action, acl)
if __name__ == '__main__':
from time import time
from pprint import pprint
ACL = {
'SUB': {
'K0USY': {
1: 'PERMIT:1-5,3120101,3120124',
2: 'DENY:1-5,3120101,3120124'
}
},
'TGID': {
'GLOBAL': {
1: 'PERMIT:ALL',
2: 'DENY:ALL'
},
'K0USY': {
1: 'PERMIT:1-5,3120,31201',
2: 'DENY:1-5,3120,31201'
}
}
}
for acl in ACL:
if 'GLOBAL' not in ACL[acl]:
ACL[acl].update({'GLOBAL': {1:'PERMIT:ALL',2:'PERMIT:ALL'}})
for acltype in ACL[acl]:
for slot in ACL[acl][acltype]:
ACL[acl][acltype][slot] = acl_build(ACL[acl][acltype][slot])
pprint(ACL)
print
print(acl_check('\x00\x00\x01', ACL['TGID']['GLOBAL'][1]))
print(acl_check('\x00\x00\x01', ACL['TGID']['K0USY'][2]))