352 lines
8.6 KiB
Go
352 lines
8.6 KiB
Go
package mysql
|
|
|
|
import (
|
|
"fmt"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/pingcap/tidb/util/hack"
|
|
log "github.com/sirupsen/logrus"
|
|
"github.com/zr-hebo/sniffer-agent/communicator"
|
|
"github.com/zr-hebo/sniffer-agent/model"
|
|
)
|
|
|
|
type MysqlSession struct {
|
|
connectionID *string
|
|
visitUser *string
|
|
visitDB *string
|
|
clientIP *string
|
|
clientPort int
|
|
srcIP *string
|
|
srcPort int
|
|
serverIP *string
|
|
serverPort int
|
|
stmtBeginTimeNano int64
|
|
// packageOffset int64
|
|
beginSeqID int64
|
|
endSeqID int64
|
|
coverRanges *coverRanges
|
|
expectReceiveSize int
|
|
expectSendSize int
|
|
prepareInfo *prepareInfo
|
|
cachedPrepareStmt map[int][]byte
|
|
cachedStmtBytes []byte
|
|
computeWindowSizeCounter int
|
|
|
|
tcpPacketCache []*model.TCPPacket
|
|
|
|
queryPieceReceiver chan model.QueryPiece
|
|
closeConn chan bool
|
|
pkgCacheLock sync.Mutex
|
|
|
|
ignoreAckID int64
|
|
sendSize int64
|
|
}
|
|
|
|
type prepareInfo struct {
|
|
prepareStmtID int
|
|
}
|
|
|
|
func NewMysqlSession(
|
|
sessionKey, clientIP *string, clientPort int, srcIP *string, srcPort int, serverIP *string, serverPort int,
|
|
receiver chan model.QueryPiece) (ms *MysqlSession) {
|
|
ms = &MysqlSession{
|
|
connectionID: sessionKey,
|
|
clientIP: clientIP,
|
|
clientPort: clientPort,
|
|
srcIP: srcIP,
|
|
srcPort: srcPort,
|
|
serverIP: serverIP,
|
|
serverPort: serverPort,
|
|
stmtBeginTimeNano: time.Now().UnixNano(),
|
|
cachedPrepareStmt: make(map[int][]byte, 8),
|
|
queryPieceReceiver: receiver,
|
|
closeConn: make(chan bool, 1),
|
|
expectReceiveSize: -1,
|
|
coverRanges: NewCoverRanges(),
|
|
ignoreAckID: -1,
|
|
sendSize: 0,
|
|
pkgCacheLock: sync.Mutex{},
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
func (ms *MysqlSession) ReceiveTCPPacket(newPkt *model.TCPPacket) {
|
|
if newPkt == nil {
|
|
return
|
|
}
|
|
|
|
if !newPkt.ToServer && ms.ignoreAckID == newPkt.Seq {
|
|
// ignore to response to client data
|
|
ms.ignoreAckID = ms.ignoreAckID + int64(len(newPkt.Payload))
|
|
return
|
|
|
|
} else if !newPkt.ToServer {
|
|
ms.ignoreAckID = newPkt.Seq + int64(len(newPkt.Payload))
|
|
}
|
|
|
|
if newPkt.ToServer {
|
|
ms.resetBeginTime()
|
|
ms.readFromClient(newPkt.Seq, newPkt.Payload)
|
|
|
|
} else {
|
|
ms.readFromServer(newPkt.Seq, newPkt.Payload)
|
|
qp := ms.GenerateQueryPiece()
|
|
if qp != nil {
|
|
ms.queryPieceReceiver <- qp
|
|
}
|
|
}
|
|
}
|
|
|
|
func (ms *MysqlSession) resetBeginTime() {
|
|
ms.stmtBeginTimeNano = time.Now().UnixNano()
|
|
}
|
|
|
|
func (ms *MysqlSession) readFromServer(respSeq int64, bytes []byte) {
|
|
if ms.expectSendSize < 1 && len(bytes) > 4 {
|
|
ms.expectSendSize = extractMysqlPayloadSize(bytes[:4])
|
|
contents := bytes[4:]
|
|
if ms.prepareInfo != nil && contents[0] == 0 {
|
|
ms.prepareInfo.prepareStmtID = bytesToInt(contents[1:5])
|
|
}
|
|
}
|
|
|
|
if ms.coverRanges.head.next == nil || ms.coverRanges.head.next.end != respSeq {
|
|
ms.clear()
|
|
}
|
|
}
|
|
|
|
func (ms *MysqlSession) checkFinish() bool {
|
|
if ms.coverRanges.head == nil || ms.coverRanges.head.next == nil {
|
|
return false
|
|
}
|
|
|
|
checkNode := ms.coverRanges.head.next
|
|
if checkNode.end-checkNode.begin == int64(len(ms.cachedStmtBytes)) {
|
|
return true
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
func (ms *MysqlSession) Close() {
|
|
ms.clear()
|
|
}
|
|
|
|
func (ms *MysqlSession) clear() {
|
|
localStmtCache.Enqueue(ms.cachedStmtBytes)
|
|
ms.cachedStmtBytes = nil
|
|
ms.expectReceiveSize = -1
|
|
ms.expectSendSize = -1
|
|
ms.prepareInfo = nil
|
|
ms.beginSeqID = -1
|
|
ms.endSeqID = -1
|
|
ms.ignoreAckID = -1
|
|
ms.sendSize = 0
|
|
ms.coverRanges.clear()
|
|
}
|
|
|
|
func (ms *MysqlSession) readFromClient(seqID int64, bytes []byte) {
|
|
contentSize := int64(len(bytes))
|
|
|
|
if ms.expectReceiveSize == -1 {
|
|
// ignore invalid head package
|
|
if len(bytes) <= 4 {
|
|
return
|
|
}
|
|
|
|
ms.expectReceiveSize = extractMysqlPayloadSize(bytes[:4])
|
|
// ignore too big mysql packet
|
|
if ms.expectReceiveSize >= MaxMysqlPacketLen {
|
|
log.Infof("expect receive size is bigger than max deal size: %d", MaxMysqlPacketLen)
|
|
return
|
|
}
|
|
|
|
contents := bytes[4:]
|
|
// add prepare info
|
|
if contents[0] == ComStmtPrepare {
|
|
ms.prepareInfo = &prepareInfo{}
|
|
}
|
|
|
|
contentSize = int64(len(contents))
|
|
seqID += 4
|
|
ms.beginSeqID = seqID
|
|
ms.endSeqID = seqID
|
|
|
|
if int64(ms.expectReceiveSize) < int64(len(contents)) {
|
|
log.Debug("receive invalid mysql packet")
|
|
return
|
|
}
|
|
|
|
newCache := localStmtCache.DequeueWithInit(ms.expectReceiveSize)
|
|
copy(newCache[:len(contents)], contents)
|
|
ms.cachedStmtBytes = newCache
|
|
|
|
} else {
|
|
// ignore too big mysql packet
|
|
if ms.expectReceiveSize >= MaxMysqlPacketLen {
|
|
return
|
|
}
|
|
|
|
if ms.beginSeqID == -1 {
|
|
log.Debug("cover range is empty")
|
|
return
|
|
}
|
|
|
|
if seqID < ms.beginSeqID {
|
|
// out date packet
|
|
log.Debugf("in session %s get outdate package with Seq:%d, beginSeq:%d",
|
|
*ms.connectionID, seqID, ms.beginSeqID)
|
|
return
|
|
}
|
|
|
|
seqOffset := seqID - ms.beginSeqID
|
|
if seqOffset+contentSize > int64(len(ms.cachedStmtBytes)) {
|
|
// not in a normal mysql packet
|
|
log.Debugf("receive an unexpect packet")
|
|
ms.clear()
|
|
return
|
|
}
|
|
|
|
// add byte to stmt cache
|
|
copy(ms.cachedStmtBytes[seqOffset:seqOffset+contentSize], bytes)
|
|
}
|
|
|
|
ms.coverRanges.addRange(coverRangePool.NewCoverage(seqID, seqID+contentSize))
|
|
// ms.expectReceiveSize = ms.expectReceiveSize - int(contentSize)
|
|
}
|
|
|
|
func IsAuth(val byte) bool {
|
|
return val > 32
|
|
}
|
|
|
|
func (ms *MysqlSession) GenerateQueryPiece() (qp model.QueryPiece) {
|
|
defer ms.clear()
|
|
|
|
if len(ms.cachedStmtBytes) < 1 {
|
|
return
|
|
}
|
|
|
|
if !ms.checkFinish() {
|
|
log.Debugf("receive a not complete cover")
|
|
return
|
|
}
|
|
|
|
if len(ms.cachedStmtBytes) > maxSQLLen {
|
|
log.Warn("sql in cache is too long, ignore it")
|
|
return
|
|
}
|
|
|
|
var mqp *model.PooledMysqlQueryPiece
|
|
var querySQLInBytes []byte
|
|
if IsAuth(ms.cachedStmtBytes[0]) {
|
|
userName, dbName, err := parseAuthInfo(ms.cachedStmtBytes)
|
|
if err != nil {
|
|
log.Errorf("parse auth info failed <-- %s", err.Error())
|
|
return
|
|
}
|
|
ms.visitUser = &userName
|
|
ms.visitDB = &dbName
|
|
|
|
} else {
|
|
switch ms.cachedStmtBytes[0] {
|
|
case ComInitDB:
|
|
newDBName := string(ms.cachedStmtBytes[1:])
|
|
useSQL := fmt.Sprintf("use %s", newDBName)
|
|
querySQLInBytes = hack.Slice(useSQL)
|
|
mqp = ms.composeQueryPiece()
|
|
mqp.QuerySQL = &useSQL
|
|
// update session database
|
|
ms.visitDB = &newDBName
|
|
|
|
case ComDropDB:
|
|
dbName := string(ms.cachedStmtBytes[1:])
|
|
dropSQL := fmt.Sprintf("drop database %s", dbName)
|
|
mqp = ms.composeQueryPiece()
|
|
mqp.QuerySQL = &dropSQL
|
|
|
|
case ComCreateDB, ComQuery:
|
|
mqp = ms.composeQueryPiece()
|
|
querySQLInBytes = ms.cachedStmtBytes[1:]
|
|
querySQL := hack.String(querySQLInBytes)
|
|
mqp.QuerySQL = &querySQL
|
|
|
|
case ComStmtPrepare:
|
|
mqp = ms.composeQueryPiece()
|
|
querySQLInBytes = make([]byte, len(ms.cachedStmtBytes[1:]))
|
|
copy(querySQLInBytes, ms.cachedStmtBytes[1:])
|
|
querySQL := hack.String(querySQLInBytes)
|
|
mqp.QuerySQL = &querySQL
|
|
ms.cachedPrepareStmt[ms.prepareInfo.prepareStmtID] = querySQLInBytes
|
|
log.Debugf("prepare statement %s, get id:%d", querySQL, ms.prepareInfo.prepareStmtID)
|
|
|
|
case ComStmtExecute:
|
|
prepareStmtID := bytesToInt(ms.cachedStmtBytes[1:5])
|
|
mqp = ms.composeQueryPiece()
|
|
var ok bool
|
|
querySQLInBytes, ok = ms.cachedPrepareStmt[prepareStmtID]
|
|
if !ok {
|
|
querySQLInBytes = PrepareStatement
|
|
}
|
|
querySQL := hack.String(querySQLInBytes)
|
|
mqp.QuerySQL = &querySQL
|
|
|
|
// log.Debugf("execute prepare statement:%d", prepareStmtID)
|
|
|
|
case ComStmtClose:
|
|
prepareStmtID := bytesToInt(ms.cachedStmtBytes[1:5])
|
|
delete(ms.cachedPrepareStmt, prepareStmtID)
|
|
log.Debugf("remove prepare statement:%d", prepareStmtID)
|
|
|
|
default:
|
|
return
|
|
}
|
|
}
|
|
|
|
if strictMode && mqp != nil && mqp.VisitUser == nil {
|
|
user, db, err := querySessionInfo(ms.serverPort, mqp.SessionID)
|
|
if err != nil {
|
|
log.Errorf("query user and db from mysql failed <-- %s", err.Error())
|
|
} else {
|
|
mqp.VisitUser = user
|
|
mqp.VisitDB = db
|
|
}
|
|
}
|
|
|
|
mqp = filterQueryPieceBySQL(mqp, querySQLInBytes)
|
|
if mqp == nil {
|
|
return nil
|
|
}
|
|
|
|
communicator.ReceiveExecTime(ms.stmtBeginTimeNano)
|
|
return mqp
|
|
}
|
|
|
|
func filterQueryPieceBySQL(mqp *model.PooledMysqlQueryPiece, querySQL []byte) (*model.PooledMysqlQueryPiece) {
|
|
if mqp == nil || querySQL == nil {
|
|
return nil
|
|
|
|
} else if (uselessSQLPattern.Match(querySQL)) {
|
|
return nil
|
|
}
|
|
|
|
if ddlPatern.Match(querySQL) {
|
|
mqp.SetNeedSyncSend(true)
|
|
}
|
|
|
|
return mqp
|
|
}
|
|
|
|
func (ms *MysqlSession) composeQueryPiece() (mqp *model.PooledMysqlQueryPiece) {
|
|
clientIP := ms.clientIP
|
|
clientPort := ms.clientPort
|
|
if clientIP == nil {
|
|
clientIP = ms.srcIP
|
|
clientPort = ms.serverPort
|
|
}
|
|
return model.NewPooledMysqlQueryPiece(
|
|
ms.connectionID, clientIP, ms.visitUser, ms.visitDB, ms.serverIP,
|
|
clientPort, ms.serverPort, communicator.GetMysqlCapturePacketRate(), ms.stmtBeginTimeNano)
|
|
}
|