#!/bin/sh

# Copyright (C) 2016-2020 Internet Systems Consortium, Inc. ("ISC")
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

# shellcheck disable=SC1091
# SC1091: Not following: ... was not specified as input (see shellcheck -x).

# Exit with error if commands exit with non-zero and if undefined variables are
# used.
set -eu

# shellcheck disable=SC2034
# SC2034: ... appears unused. Verify use (or export if used externally).
prefix="/usr"

# Include utilities. Use installed version if available and
# use build version if it isn't.
if [ -e ${prefix}/share/kea/scripts/admin-utils.sh ]; then
    . "${prefix}/share/kea/scripts/admin-utils.sh"
else
    . "/build/kea/src/kea-1.9.8/src/bin/admin/admin-utils.sh"
fi

VERSION=$(mysql_version "$@")

if [ "$VERSION" != "3.0" ]; then
    printf 'This script upgrades 3.0 to 4.0. '
    printf 'Reported version is %s. Skipping upgrade.\n' "${VERSION}"
    exit 0
fi

mysql "$@" <<EOF
# Add state column to the lease4 table.
ALTER TABLE lease4
    ADD COLUMN state INT UNSIGNED DEFAULT 0;

# Add state column to the lease6 table.
ALTER TABLE lease6
    ADD COLUMN state INT UNSIGNED DEFAULT 0;

# Create indexes for querying leases in a given state and segregated
# by the expiration time. One of the applications is to retrieve all
# expired leases. However, these indexes can be also used to retrieve
# leases in a given state regardless of the expiration time.
CREATE INDEX lease4_by_state_expire ON lease4 (state ASC, expire ASC);
CREATE INDEX lease6_by_state_expire ON lease6 (state ASC, expire ASC);

# Create table holding mapping of the lease states to their names.
# This is not used in queries from the DHCP server but rather in
# direct queries from the lease database management tools.
CREATE TABLE IF NOT EXISTS lease_state (
  state INT UNSIGNED PRIMARY KEY NOT NULL,
  name VARCHAR(64) NOT NULL
) ENGINE=INNODB;

# Insert currently defined state names.
INSERT INTO lease_state VALUES (0, 'default');
INSERT INTO lease_state VALUES (1, 'declined');
INSERT INTO lease_state VALUES (2, 'expired-reclaimed');

# Add a constraint that any state value added to the lease4 must
# map to a value in the lease_state table.
ALTER TABLE lease4
    ADD CONSTRAINT fk_lease4_state FOREIGN KEY (state)
    REFERENCES lease_state (state);

# Add a constraint that any state value added to the lease6 must
# map to a value in the lease_state table.
ALTER TABLE lease6
    ADD CONSTRAINT fk_lease6_state FOREIGN KEY (state)
    REFERENCES lease_state (state);

# Add a constraint that lease type in the lease6 table must map
# to a lease type defined in the lease6_types table.
ALTER TABLE lease6
    ADD CONSTRAINT fk_lease6_type FOREIGN KEY (lease_type)
    REFERENCES lease6_types (lease_type);

# Modify the name of one of the HW address sources, and add a new one.
UPDATE lease_hwaddr_source
    SET name = 'HWADDR_SOURCE_DOCSIS_CMTS'
    WHERE hwaddr_source = 64;

INSERT INTO lease_hwaddr_source VALUES (128, 'HWADDR_SOURCE_DOCSIS_MODEM');

# Add UNSIGNED to match with the lease6.
ALTER TABLE lease_hwaddr_source
    MODIFY COLUMN hwaddr_source INT UNSIGNED NOT NULL DEFAULT 0;

# Add a constraint that non-null hwaddr_source in the lease6 table
# must map to an entry in the lease_hwaddr_source.
ALTER TABLE lease6
    ADD CONSTRAINT fk_lease6_hwaddr_source FOREIGN KEY (hwaddr_source)
    REFERENCES lease_hwaddr_source (hwaddr_source);

# FUNCTION that returns a result set containing the column names for lease4 dumps
DROP PROCEDURE IF EXISTS lease4DumpHeader;
DELIMITER $$
CREATE PROCEDURE lease4DumpHeader()
BEGIN
SELECT 'address,hwaddr,client_id,valid_lifetime,expire,subnet_id,fqdn_fwd,fqdn_rev,hostname,state';
END  $$
DELIMITER ;

# FUNCTION that returns a result set containing the data for lease4 dumps
DROP PROCEDURE IF EXISTS lease4DumpData;
DELIMITER $$
CREATE PROCEDURE lease4DumpData()
BEGIN
SELECT
    INET_NTOA(l.address),
    IFNULL(HEX(l.hwaddr), ''),
    IFNULL(HEX(l.client_id), ''),
    l.valid_lifetime,
    l.expire,
    l.subnet_id,
    l.fqdn_fwd,
    l.fqdn_rev,
    l.hostname,
    s.name
from
    lease4 l
    LEFT OUTER JOIN lease_state s on (l.state = s.state);
END $$
DELIMITER ;

# FUNCTION that returns a result set containing the column names for lease6 dumps
DROP PROCEDURE IF EXISTS lease6DumpHeader;
DELIMITER $$
CREATE PROCEDURE lease6DumpHeader()
BEGIN
SELECT 'address,duid,valid_lifetime,expire,subnet_id,pref_lifetime,lease_type,iaid,prefix_len,fqdn_fwd,fqdn_rev,hostname,hwaddr,hwtype,hwaddr_source,state';
END  $$
DELIMITER ;

# FUNCTION that returns a result set containing the data for lease6 dumps
DROP PROCEDURE IF EXISTS lease6DumpData;
DELIMITER $$
CREATE PROCEDURE lease6DumpData()
BEGIN
SELECT
    l.address,
    IFNULL(HEX(l.duid), ''),
    l.valid_lifetime,
    l.expire,
    l.subnet_id,
    l.pref_lifetime,
    IFNULL(t.name, ''),
    l.iaid,
    l.prefix_len,
    l.fqdn_fwd,
    l.fqdn_rev,
    l.hostname,
    IFNULL(HEX(l.hwaddr), ''),
    IFNULL(l.hwtype, ''),
    IFNULL(h.name, ''),
    IFNULL(s.name, '')
FROM lease6 l
    left outer join lease6_types t on (l.lease_type = t.lease_type)
    left outer join lease_state s on (l.state = s.state)
    left outer join lease_hwaddr_source h on (l.hwaddr_source = h.hwaddr_source);
END $$
DELIMITER ;

# Update the schema version number
UPDATE schema_version
SET version = '4', minor = '0';
# This line concludes database upgrade to version 4.0.
EOF
