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utils.go
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package dbshield
import (
"encoding/binary"
"fmt"
"io"
"net"
"os"
"os/signal"
"strings"
"time"
"github.com/boltdb/bolt"
"github.com/nim4/DBShield/dbshield/config"
"github.com/nim4/DBShield/dbshield/dbms"
"github.com/nim4/DBShield/dbshield/logger"
"github.com/nim4/DBShield/dbshield/training"
"github.com/nim4/DBShield/dbshield/utils"
)
const (
mysql = iota
mssql
postgres
db2
oracle
)
//initial boltdb database
func initModel(path string) {
logger.Infof("Internal DB: %s", path)
if training.DBCon == nil {
training.DBCon, _ = bolt.Open(path, 0600, nil)
training.DBCon.Update(func(tx *bolt.Tx) error {
tx.CreateBucketIfNotExists([]byte("pattern"))
tx.CreateBucketIfNotExists([]byte("abnormal"))
b, _ := tx.CreateBucketIfNotExists([]byte("state"))
v := b.Get([]byte("QueryCounter"))
if v != nil {
training.QueryCounter = binary.BigEndian.Uint64(v)
}
v = b.Get([]byte("AbnormalCounter"))
if v != nil {
training.AbnormalCounter = binary.BigEndian.Uint64(v)
}
return nil
})
}
if config.Config.SyncInterval != 0 {
training.DBCon.NoSync = true
ticker := time.NewTicker(config.Config.SyncInterval)
go func() {
for range ticker.C {
training.DBCon.Sync()
}
}()
}
}
func closeHandlers() {
if training.DBCon != nil {
training.DBCon.Update(func(tx *bolt.Tx) error {
//Supplied value must remain valid for the life of the transaction
qCount := make([]byte, 8)
abCount := make([]byte, 8)
b := tx.Bucket([]byte("state"))
binary.BigEndian.PutUint64(qCount, training.QueryCounter)
b.Put([]byte("QueryCounter"), qCount)
binary.BigEndian.PutUint64(abCount, training.AbnormalCounter)
b.Put([]byte("AbnormalCounter"), abCount)
return nil
})
training.DBCon.Sync()
training.DBCon.Close()
}
if logger.Output != nil {
logger.Output.Close()
}
}
//catching Interrupts
func signalHandler() {
term := make(chan os.Signal)
signal.Notify(term, os.Interrupt)
<-term
logger.Info("Shutting down...")
//Closing open handler politely
closeHandlers()
}
//initLogging redirect log output to file/stdout/stderr
func initLogging() {
err := logger.Init(config.Config.LogPath, config.Config.LogLevel)
if err != nil {
panic(err)
}
}
//maps database name to corresponding struct
func dbNameToStruct(db string) (d uint, err error) {
switch strings.ToLower(db) {
case "db2":
d = db2
case "mssql":
d = mssql
case "mysql", "mariadb":
d = mysql
case "oracle":
d = oracle
case "postgres":
d = postgres
default:
err = fmt.Errorf("Unknown DBMS: %s", db)
}
return
}
//generateDBMS instantiate a new instance of DBMS
func generateDBMS() (utils.DBMS, func(io.Reader) ([]byte, error)) {
switch config.Config.DB {
case mssql:
return new(dbms.MSSQL), dbms.MSSQLReadPacket
case mysql:
return new(dbms.MySQL), dbms.MySQLReadPacket
case postgres:
return new(dbms.Postgres), dbms.ReadPacket //TODO: implement explicit reader
case oracle:
return new(dbms.Oracle), dbms.ReadPacket //TODO: implement explicit reader
case db2:
return new(dbms.DB2), dbms.ReadPacket //TODO: implement explicit reader
default:
return nil, nil
}
}
func handleClient(listenConn net.Conn, serverAddr *net.TCPAddr) error {
d, reader := generateDBMS()
logger.Debugf("Connected from: %s", listenConn.RemoteAddr())
serverConn, err := net.DialTCP("tcp", nil, serverAddr)
if err != nil {
logger.Warning(err)
listenConn.Close()
return err
}
if config.Config.Timeout > 0 {
if err = listenConn.SetDeadline(time.Now().Add(config.Config.Timeout)); err != nil {
return err
}
if err = serverConn.SetDeadline(time.Now().Add(config.Config.Timeout)); err != nil {
return err
}
}
logger.Debugf("Connected to: %s", serverConn.RemoteAddr())
d.SetSockets(listenConn, serverConn)
d.SetCertificate(config.Config.TLSCertificate, config.Config.TLSPrivateKey)
d.SetReader(reader)
err = d.Handler()
if err != nil {
logger.Warning(err)
}
return err
}