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schemas.py
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schemas.py
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# DHCPy6d DHCPv6 Daemon
#
# Copyright (C) 2009-2024 Henri Wahl <henri@dhcpy6d.de>
#
# 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 2 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
import sys
from ..config import cfg
# put SQL schemas here to be in reach of all storage types
# generic mostly usable for SQLite and MySQL/MariaDB
MYSQL_SQLITE = {}
MYSQL_SQLITE['meta'] = '''
CREATE TABLE meta (
item_key varchar(255) NOT NULL,
item_value varchar(255) NOT NULL,
PRIMARY KEY (item_key)
);
'''
MYSQL_SQLITE['leases'] = '''
CREATE TABLE leases (
address varchar(32) NOT NULL,
active tinyint(4) NOT NULL,
preferred_lifetime int(11) NOT NULL,
valid_lifetime int(11) NOT NULL,
hostname varchar(255) NOT NULL,
type varchar(255) NOT NULL,
category varchar(255) NOT NULL,
ia_type varchar(255) NOT NULL,
class varchar(255) NOT NULL,
mac varchar(17) NOT NULL,
duid varchar(255) NOT NULL,
last_update bigint NOT NULL,
preferred_until bigint NOT NULL,
valid_until bigint NOT NULL,
iaid varchar(8) DEFAULT NULL,
last_message int(11) NOT NULL DEFAULT 0,
PRIMARY KEY (address)
);
'''
MYSQL_SQLITE['macs_llips'] = '''
CREATE TABLE macs_llips (
mac varchar(17) NOT NULL,
link_local_ip varchar(39) NOT NULL,
last_update bigint NOT NULL,
PRIMARY KEY (mac)
);
'''
MYSQL_SQLITE['prefixes'] = '''
CREATE TABLE prefixes (
prefix varchar(32) NOT NULL,
length tinyint(4) NOT NULL,
active tinyint(4) NOT NULL,
preferred_lifetime int(11) NOT NULL,
valid_lifetime int(11) NOT NULL,
hostname varchar(255) NOT NULL,
type varchar(255) NOT NULL,
category varchar(255) NOT NULL,
class varchar(255) NOT NULL,
mac varchar(17) NOT NULL,
duid varchar(255) NOT NULL,
last_update bigint NOT NULL,
preferred_until bigint NOT NULL,
valid_until bigint NOT NULL,
iaid varchar(8) DEFAULT NULL,
last_message int(11) NOT NULL DEFAULT 0,
PRIMARY KEY (prefix)
);
'''
MYSQL_SQLITE['routes'] = '''
CREATE TABLE routes (
prefix varchar(32) NOT NULL,
length tinyint(4) NOT NULL,
router varchar(32) NOT NULL,
last_update bigint NOT NULL,
PRIMARY KEY (prefix)
);
'''
# Postgresql has some differences and so its own schemas
POSTGRESQL_SCHEMA = {}
POSTGRESQL_SCHEMA['meta'] = '''
CREATE TABLE meta (
item_key varchar(255) NOT NULL,
item_value varchar(255) NOT NULL,
PRIMARY KEY (item_key)
);
'''
POSTGRESQL_SCHEMA['leases'] = '''
CREATE TABLE leases (
address varchar(32) NOT NULL,
active smallint NOT NULL,
preferred_lifetime int NOT NULL,
valid_lifetime int NOT NULL,
hostname varchar(255) NOT NULL,
type varchar(255) NOT NULL,
category varchar(255) NOT NULL,
ia_type varchar(255) NOT NULL,
class varchar(255) NOT NULL,
mac varchar(17) NOT NULL,
duid varchar(255) NOT NULL,
last_update bigint NOT NULL,
preferred_until bigint NOT NULL,
valid_until bigint NOT NULL,
iaid varchar(8) DEFAULT NULL,
last_message int NOT NULL DEFAULT 0,
PRIMARY KEY (address)
);
'''
POSTGRESQL_SCHEMA['macs_llips'] = '''
CREATE TABLE macs_llips (
mac varchar(17) NOT NULL,
link_local_ip varchar(39) NOT NULL,
last_update bigint NOT NULL,
PRIMARY KEY (mac)
);
'''
POSTGRESQL_SCHEMA['prefixes'] = '''
CREATE TABLE prefixes (
prefix varchar(32) NOT NULL,
length smallint NOT NULL,
active smallint NOT NULL,
preferred_lifetime int NOT NULL,
valid_lifetime int NOT NULL,
hostname varchar(255) NOT NULL,
type varchar(255) NOT NULL,
category varchar(255) NOT NULL,
class varchar(255) NOT NULL,
mac varchar(17) NOT NULL,
duid varchar(255) NOT NULL,
last_update bigint NOT NULL,
preferred_until bigint NOT NULL,
valid_until bigint NOT NULL,
iaid varchar(8) DEFAULT NULL,
last_message int NOT NULL DEFAULT 0,
PRIMARY KEY (prefix)
);
'''
POSTGRESQL_SCHEMA['routes'] = '''
CREATE TABLE routes (
prefix varchar(32) NOT NULL,
length smallint NOT NULL,
router varchar(32) NOT NULL,
last_update bigint NOT NULL,
PRIMARY KEY (prefix)
);
'''
# formerly part of store.py but might fit better here
def legacy_adjustments(db):
"""
adjust some existing data to work with newer versions of dhcpy6d
"""
try:
if db.query('SELECT last_message FROM leases LIMIT 1') is None:
# row 'last_message' in schemas 'leases' does not exist yet, comes with version 0.1.6
db.query('ALTER TABLE leases ADD last_message INT NOT NULL DEFAULT 0')
print("Adding row 'last_message' to table 'leases' in volatile storage succeeded.")
except:
print("\n'ALTER TABLE leases ADD last_message INT NOT NULL DEFAULT 0' on volatile database failed.")
print('Please apply manually or grant necessary permissions.\n')
sys.exit(1)
# after 0.4.3 with working PostgreSQL support the timestamps have to be stores in epoch seconds, not datetime
# also after 0.4.3 there will be a third table containing meta information - for a first start it should contain
# a database version number
try:
try:
# only newer databases contain a version number - real ones starting with 1
# non-existing version is False
db_version = db.get_db_version()
if db_version is None or int(db_version) == 0:
db_operations = []
# only create meta table if it does not exist yet
if not 'meta' in db.get_tables():
db_operations.append('CREATE TABLE meta (item_key varchar(255) NOT NULL,\
item_value varchar(255) NOT NULL, PRIMARY KEY (item_key))')
# add version of database scheme
db_operations.append("INSERT INTO meta (item_key, item_value) VALUES ('version', '1')")
for db_operation in db_operations:
db.query(db_operation)
print(f"{db_operation} in volatile storage succeded.")
except Exception as err:
print(f"\n{db_operation} on volatile database failed.")
print('Please apply manually or grant necessary permissions.\n')
sys.exit(1)
except Exception as err:
print('\nSomething went wrong when retrieving version from database.\n')
sys.exit(1)
# find out if timestamps still are in datetime format - applies only to sqlite and mysql anyway
if cfg.STORE_VOLATILE in ['sqlite', 'mysql']:
db_datetime_test = db.query('SELECT last_update FROM leases LIMIT 1')
if len(db_datetime_test) > 0:
import datetime
# flag to find out which update has to be done
update_type = False
# MySQL
if type(db_datetime_test[0][0]) is datetime.datetime:
update_type = 'mysql'
# SQLite
if type(db_datetime_test[0][0]) is str:
if ' ' in db_datetime_test[0][0]:
update_type = 'sqlite'
if update_type:
# add new columns with suffix *_new
db_tables = {'leases': ['last_update', 'preferred_until', 'valid_until'],
'macs_llips': ['last_update']}
if update_type == 'mysql':
for table in db_tables:
for column in db_tables[table]:
db.query(f'ALTER TABLE {table} ADD COLUMN {column}_new bigint NOT NULL')
print(f'ALTER TABLE {table} ADD COLUMN {column}_new bigint NOT NULL succeeded')
# get old timestamps
timestamps_old = db.query(
'SELECT address, last_update, preferred_until, valid_until FROM leases')
for timestamp_old in timestamps_old:
address, last_update, preferred_until, valid_until = timestamp_old
# convert SQLite datetime values from unicode to Python datetime
if update_type == 'sqlite':
last_update = datetime.datetime.strptime(last_update, '%Y-%m-%d %H:%M:%S.%f')
preferred_until = datetime.datetime.strptime(preferred_until, '%Y-%m-%d %H:%M:%S.%f')
valid_until = datetime.datetime.strptime(valid_until, '%Y-%m-%d %H:%M:%S.%f')
last_update_new = last_update.strftime('%s')
preferred_until_new = preferred_until.strftime('%s')
valid_until_new = valid_until.strftime('%s')
db.query(f"UPDATE leases SET last_update_new = {last_update_new}, "
f"preferred_until_new = {preferred_until_new}, "
f"valid_until_new = {valid_until_new} "
f"WHERE address = '{address}'")
print('Converting timestamps of leases succeeded')
timestamps_old = db.query('SELECT mac, last_update FROM macs_llips')
for timestamp_old in timestamps_old:
mac, last_update = timestamp_old
last_update_new = last_update.strftime('%s')
db.query(f"UPDATE macs_llips SET last_update_new = {last_update_new} WHERE mac = '{mac}'")
print('Converting timestamps of macs_llips succeeded')
for table in db_tables:
for column in db_tables[table]:
db.query(f'ALTER TABLE {table} DROP COLUMN {column}')
db.query(f'ALTER TABLE {table} CHANGE COLUMN {column}_new {column} BIGINT NOT NULL')
print(f'Moving column {column} of table {table} succeeded')
if update_type == 'sqlite':
for table in db_tables:
db.query(f'ALTER TABLE {table} RENAME TO {table}_old')
db.query('CREATE TABLE leases AS SELECT address,active,last_message,preferred_lifetime,'
'valid_lifetime,hostname,type,category,ia_type,'
'class,mac,duid,iaid '
'FROM leases_old')
db.query('CREATE TABLE macs_llips AS SELECT mac,link_local_ip FROM macs_llips_old')
# add timestamp columns in bigint format instead of datetime
for table in db_tables:
for column in db_tables[table]:
db.query(f'ALTER TABLE {table} ADD COLUMN {column} bigint')
# get old timestamps
timestamps_old = db.query(
'SELECT address, last_update, preferred_until, valid_until FROM leases_old')
for timestamp_old in timestamps_old:
address, last_update, preferred_until, valid_until = timestamp_old
# convert SQLite datetime values from unicode to Python datetime
if update_type == 'sqlite':
last_update = datetime.datetime.strptime(last_update, '%Y-%m-%d %H:%M:%S.%f')
preferred_until = datetime.datetime.strptime(preferred_until, '%Y-%m-%d %H:%M:%S.%f')
valid_until = datetime.datetime.strptime(valid_until, '%Y-%m-%d %H:%M:%S.%f')
last_update_new = last_update.strftime('%s')
preferred_until_new = preferred_until.strftime('%s')
valid_until_new = valid_until.strftime('%s')
db.query(f"UPDATE leases SET last_update = {last_update_new}, "
f"preferred_until = {preferred_until_new}, "
f"valid_until = {valid_until_new} "
f"WHERE address = '{address}'")
print('Converting timestamps of leases succeeded')
timestamps_old = db.query('SELECT mac, last_update FROM macs_llips_old')
for timestamp_old in timestamps_old:
mac, last_update = timestamp_old
last_update_new = last_update.strftime('%s')
db.query(f"UPDATE macs_llips SET last_update = {last_update_new} WHERE mac = '{mac}'")
print('Converting timestamps of macs_llips succeeded')
# Extend volatile database to handle prefixes - comes with database version 2
if int(db.get_db_version()) < 2:
if not 'prefixes' in db.get_tables():
if cfg.STORE_VOLATILE in ['sqlite', 'mysql']:
db.query('CREATE TABLE prefixes (\
prefix varchar(32) NOT NULL,\
length tinyint(4) NOT NULL,\
active tinyint(4) NOT NULL,\
preferred_lifetime int(11) NOT NULL,\
valid_lifetime int(11) NOT NULL,\
hostname varchar(255) NOT NULL,\
type varchar(255) NOT NULL,\
category varchar(255) NOT NULL,\
class varchar(255) NOT NULL,\
mac varchar(17) NOT NULL,\
duid varchar(255) NOT NULL,\
last_update bigint NOT NULL,\
preferred_until bigint NOT NULL,\
valid_until bigint NOT NULL,\
iaid varchar(8) DEFAULT NULL,\
last_message int(11) NOT NULL DEFAULT 0,\
PRIMARY KEY (prefix)\
)')
elif cfg.STORE_VOLATILE == 'postgresql':
db.query('CREATE TABLE prefixes (\
prefix varchar(32) NOT NULL,\
length smallint NOT NULL,\
active smallint NOT NULL,\
preferred_lifetime int NOT NULL,\
valid_lifetime int NOT NULL,\
hostname varchar(255) NOT NULL,\
type varchar(255) NOT NULL,\
category varchar(255) NOT NULL,\
class varchar(255) NOT NULL,\
mac varchar(17) NOT NULL,\
duid varchar(255) NOT NULL,\
last_update bigint NOT NULL,\
preferred_until bigint NOT NULL,\
valid_until bigint NOT NULL,\
iaid varchar(8) DEFAULT NULL,\
last_message int NOT NULL DEFAULT 0,\
PRIMARY KEY (prefix)\
)')
# increase version to 2
db.query("UPDATE meta SET item_value='2' WHERE item_key='version'")
# All OK
print("Table 'prefixes' is OK")
# Extend volatile database to handle routes - comes with database version 3
if int(db.get_db_version()) < 3:
if not 'prefixes' in db.get_tables():
if cfg.STORE_VOLATILE in ['sqlite', 'mysql']:
db.query('CREATE TABLE routes (\
prefix varchar(32) NOT NULL,\
length tinyint(4) NOT NULL,\
router varchar(32) NOT NULL,\
last_update bigint NOT NULL,\
PRIMARY KEY (prefix)\
)')
elif cfg.STORE_VOLATILE == 'postgresql':
db.query('CREATE TABLE routes (\
prefix varchar(32) NOT NULL,\
length smallint NOT NULL,\
router varchar(32) NOT NULL,\
last_update bigint NOT NULL,\
PRIMARY KEY (prefix)\
)')
# increase version to 3
db.query("UPDATE meta SET item_value='3' WHERE item_key='version'")
# All OK
print("Table 'routes' is OK")