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freeciv/._cfg0001_database.lua
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402
freeciv/._cfg0001_database.lua
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-- Freeciv - Copyright (C) 2011 - The Freeciv Project
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-- This program is free software; you can redistribute it and/or modify
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-- it under the terms of the GNU General Public License as published by
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-- the Free Software Foundation; either version 2, or (at your option)
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-- any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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-- This file is the Freeciv server`s interface to the database backend
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-- when authentication is enabled. See doc/README.fcdb.
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local dbh = nil
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-- Machinery for debug logging of options
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local seen_options
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local function options_init()
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seen_options = {}
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end
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local function option_log(name, val, is_sensitive, source)
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if not seen_options[name] then
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seen_options[name] = true
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if is_sensitive then
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log.debug('Database option \'%s\': %s', name, source)
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else
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log.debug('Database option \'%s\': %s: value \'%s\'', name, source, val)
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end
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end
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end
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-- Get an option from configuration file, falling back to sensible
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-- defaults where they exist
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local function get_option(name, is_sensitive)
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local defaults = {
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backend = "sqlite",
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table_user = "fcdb_auth",
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table_log = "fcdb_log"
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}
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local val = fcdb.option(name)
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if val then
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option_log(name, val, is_sensitive, 'read from file')
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else
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val = defaults[name]
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if val then
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option_log(name, val, is_sensitive, 'using default')
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end
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end
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if not val then
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log.error('Database option \'%s\' not specified in configuration file',
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name)
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end
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return val
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end
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-- connect to a MySQL database (or stop with an error)
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local function mysql_connect()
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local err -- error message
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if dbh then
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dbh:close()
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end
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local sql = ls_mysql.mysql()
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log.verbose('MySQL database version is %s.', ls_mysql._MYSQLVERSION)
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-- Load the database parameters.
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local database = get_option("database")
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local user = get_option("user")
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local password = get_option("password", true)
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local host = get_option("host")
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local port = get_option("port")
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dbh, err = sql:connect(database, user, password, host, port)
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if not dbh then
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log.error('[mysql:connect]: %s', err)
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return fcdb.status.ERROR
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else
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return fcdb.status.TRUE
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end
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end
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-- open a SQLite database (or stop with an error)
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local function sqlite_connect()
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local err -- error message
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if dbh then
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dbh:close()
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end
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local sql = ls_sqlite3.sqlite3()
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-- Load the database parameters.
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local database = get_option("database")
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dbh, err = sql:connect(database)
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if not dbh then
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log.error('[sqlite:connect]: %s', err)
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return fcdb.status.ERROR
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else
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return fcdb.status.TRUE
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end
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end
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-- execute a sql query
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local function execute(query)
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local res -- result handle
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local err -- error message
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if not dbh then
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return fcdb.status.ERROR, "[execute] Invalid database handle."
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end
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-- log.verbose("Database query: %s", query)
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res, err = dbh:execute(query)
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if not res then
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log.error("[luasql:execute]: %s", err)
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return fcdb.status.ERROR, err
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else
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return fcdb.status.TRUE, res
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end
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end
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-- DIRTY: return a string to put in a database query which gets the
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-- current time (in seconds since the epoch, UTC).
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-- (This should be replaced with Lua os.time() once the script has access
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-- to this, see <http://gna.org/bugs/?19729>.)
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function sql_time()
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local backend = get_option("backend")
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if backend == 'mysql' then
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return 'UNIX_TIMESTAMP()'
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elseif backend == 'sqlite' then
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return 'strftime(\'%s\',\'now\')'
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else
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log.error('Don\'t know how to do timestamps for database backend \'%s\'', backend)
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return 'ERROR'
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end
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end
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-- Set up tables for an SQLite database.
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-- (Since there`s no concept of user rights, we can do this directly from Lua,
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-- without needing a separate script like MySQL. The server operator can do
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-- "/fcdb lua sqlite_createdb()" from the server prompt.)
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function sqlite_createdb()
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local query
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local res
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if get_option("backend") ~= 'sqlite' then
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log.error("'backend' in configuration file must be 'sqlite'")
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return fcdb.status.ERROR
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end
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local table_user = get_option("table_user")
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local table_log = get_option("table_log")
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if not dbh then
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log.error("Missing database connection...")
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return fcdb.status.ERROR
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end
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query = string.format([[
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CREATE TABLE %s (
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id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
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name VARCHAR(48) default NULL UNIQUE,
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password VARCHAR(32) default NULL,
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email VARCHAR default NULL,
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createtime INTEGER default NULL,
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accesstime INTEGER default NULL,
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address VARCHAR default NULL,
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createaddress VARCHAR default NULL,
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logincount INTEGER default '0'
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);
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]], table_user)
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status, res = execute(query)
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if status == fcdb.status.TRUE then
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log.normal("Successfully created user table '%s'", table_user)
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else
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log.error("Error creating user table '%s'", table_user)
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return fcdb.status.ERROR
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end
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query = string.format([[
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CREATE TABLE %s (
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id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
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name VARCHAR(48) default NULL,
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logintime INTEGER default NULL,
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address VARCHAR default NULL,
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succeed TEXT default 'S'
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);]], table_log)
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status, res = execute(query)
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if status == fcdb.status.TRUE then
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log.normal("Successfully created log table '%s'", table_log)
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else
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log.error("Error creating log table '%s'", table_log)
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return fcdb.status.ERROR
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end
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return fcdb.status.TRUE
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end
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-- **************************************************************************
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-- For MySQL, the following shapes of tables are expected
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-- (scripts/setup_auth_server.sh automates this):
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--
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-- CREATE TABLE fcdb_auth (
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-- id int(11) NOT NULL auto_increment,
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-- name varchar(48) default NULL,
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-- password varchar(32) default NULL,
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-- email varchar(128) default NULL,
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-- createtime int(11) default NULL,
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-- accesstime int(11) default NULL,
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-- address varchar(255) default NULL,
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-- createaddress varchar(255) default NULL,
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-- logincount int(11) default '0',
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-- PRIMARY KEY (id),
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-- UNIQUE KEY name (name)
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-- );
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--
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-- CREATE TABLE fcdb_log (
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-- id int(11) NOT NULL auto_increment,
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-- name varchar(48) default NULL,
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-- logintime int(11) default NULL,
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-- address varchar(255) default NULL,
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-- succeed enum('S','F') default 'S',
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-- PRIMARY KEY (id)
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-- );
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--
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-- N.B. if the tables are not of this format, then the select, insert,
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-- and update syntax in the following functions must be changed.
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-- **************************************************************************
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-- **************************************************************************
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-- freeciv user auth functions
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-- **************************************************************************
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-- load user data
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function user_load(conn)
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local status -- return value (status of the request)
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local res -- result handle
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local row -- one row of the sql result
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local query -- sql query
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local fields = 'password'
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local table_user = get_option("table_user")
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local table_log = get_option("table_log")
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if not dbh then
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log.error("Missing database connection...")
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return fcdb.status.ERROR
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end
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local username = dbh:escape(auth.get_username(conn))
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local ipaddr = dbh:escape(auth.get_ipaddr(conn))
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-- get the password for this user
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query = string.format([[SELECT %s FROM %s WHERE name = '%s']],
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fields, table_user, username)
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status, res = execute(query)
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if status ~= fcdb.status.TRUE then
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return fcdb.status.ERROR
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end
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row = res:fetch({}, 'a')
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if not row then
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-- No match
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res:close()
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return fcdb.status.FALSE
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end
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-- There should be only one result
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if res:fetch() then
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log.error('[user_load]: multiple entries (%d) for user: %s',
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numrows, username)
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res:close()
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return fcdb.status.FALSE
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end
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auth.set_password(conn, row.password)
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res:close()
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return fcdb.status.TRUE
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end
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-- save a user to the database
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function user_save(conn)
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local status -- return value (status of the request)
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local res -- result handle
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local query -- sql query
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local table_user = get_option("table_user")
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if not dbh then
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log.error("Missing database connection...")
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return fcdb.status.ERROR
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end
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local username = dbh:escape(auth.get_username(conn))
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local password = dbh:escape(auth.get_password(conn))
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local ipaddr = auth.get_ipaddr(conn)
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-- insert the user
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--local now = os.time()
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query = string.format([[INSERT INTO %s VALUES (NULL, '%s', '%s',
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NULL, %s, %s, '%s', '%s', 0)]],
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table_user, username, password,
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sql_time(), sql_time(),
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ipaddr, ipaddr)
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status, res = execute(query)
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if status ~= fcdb.status.TRUE then
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return fcdb.status.ERROR
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end
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-- log this session
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return user_log(conn, true)
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end
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-- log the session
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function user_log(conn, success)
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local status -- return value (status of the request)
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local res -- result handle
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local query -- sql query
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if not dbh then
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log.error("Missing database connection...")
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return fcdb.status.ERROR
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end
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local table_user = get_option("table_user")
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local table_log = get_option("table_log")
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local username = dbh:escape(auth.get_username(conn))
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local ipaddr = auth.get_ipaddr(conn)
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local success_str = success and 'S' or 'F'
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-- update user data
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--local now = os.time()
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query = string.format([[UPDATE %s SET accesstime = %s, address = '%s',
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logincount = logincount + 1
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WHERE name = '%s']], table_user, sql_time(),
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ipaddr, username)
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status, res = execute(query)
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if status ~= fcdb.status.TRUE then
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return fcdb.status.ERROR
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end
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-- insert the log row for this user
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query = string.format([[INSERT INTO %s (name, logintime, address, succeed)
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VALUES ('%s', %s, '%s', '%s')]],
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table_log, username, sql_time(), ipaddr, success_str)
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status, res = execute(query)
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if status ~= fcdb.status.TRUE then
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return fcdb.status.ERROR
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end
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return fcdb.status.TRUE
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end
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-- **************************************************************************
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-- freeciv database entry functions
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-- **************************************************************************
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-- test and initialise the database connection
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function database_init()
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local status -- return value (status of the request)
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options_init()
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local backend = get_option("backend")
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if backend == 'mysql' then
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log.verbose('Opening MySQL database connection...')
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status = mysql_connect()
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elseif backend == 'sqlite' then
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log.verbose('Opening SQLite database connection...')
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status = sqlite_connect()
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else
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log.error('Database backend \'%s\' not supported by database.lua', backend)
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return fcdb.status.ERROR
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end
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if status == fcdb.status.TRUE then
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log.verbose('Database connection successful.')
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end
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return status
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end
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-- free the database connection
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function database_free()
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log.verbose('Closing database connection...')
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if dbh then
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dbh:close()
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end
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return fcdb.status.TRUE;
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end
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