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package mysql
import (
"errors"
"fmt"
"strings"
"time"
"github.com/elastic/beats/libbeat/beat"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/logp"
"github.com/elastic/beats/libbeat/monitoring"
"github.com/elastic/beats/packetbeat/procs"
"github.com/elastic/beats/packetbeat/protos"
"github.com/elastic/beats/packetbeat/protos/tcp"
)
// Packet types
const (
mysqlCmdQuery = 3
)
const maxPayloadSize = 100 * 1024
var (
unmatchedRequests = monitoring.NewInt(nil, "mysql.unmatched_requests")
unmatchedResponses = monitoring.NewInt(nil, "mysql.unmatched_responses")
)
type mysqlMessage struct {
start int
end int
ts time.Time
isRequest bool
packetLength uint32
seq uint8
typ uint8
numberOfRows int
numberOfFields int
size uint64
fields []string
rows [][]string
tables string
isOK bool
affectedRows uint64
insertID uint64
isError bool
errorCode uint16
errorInfo string
query string
ignoreMessage bool
direction uint8
isTruncated bool
tcpTuple common.TCPTuple
cmdlineTuple *common.CmdlineTuple
raw []byte
notes []string
}
type mysqlTransaction struct {
tuple common.TCPTuple
src common.Endpoint
dst common.Endpoint
responseTime int32
ts time.Time
query string
method string
path string // for mysql, Path refers to the mysql table queried
bytesOut uint64
bytesIn uint64
notes []string
mysql common.MapStr
requestRaw string
responseRaw string
}
type mysqlStream struct {
data []byte
parseOffset int
parseState parseState
isClient bool
message *mysqlMessage
}
type parseState int
const (
mysqlStateStart parseState = iota
mysqlStateEatMessage
mysqlStateEatFields
mysqlStateEatRows
mysqlStateMax
)
var stateStrings = []string{
"Start",
"EatMessage",
"EatFields",
"EatRows",
}
func (state parseState) String() string {
return stateStrings[state]
}
type mysqlPlugin struct {
// config
ports []int
maxStoreRows int
maxRowLength int
sendRequest bool
sendResponse bool
transactions *common.Cache
transactionTimeout time.Duration
results protos.Reporter
// function pointer for mocking
handleMysql func(mysql *mysqlPlugin, m *mysqlMessage, tcp *common.TCPTuple,
dir uint8, raw_msg []byte)
}
func init() {
protos.Register("mysql", New)
}
func New(
testMode bool,
results protos.Reporter,
cfg *common.Config,
) (protos.Plugin, error) {
p := &mysqlPlugin{}
config := defaultConfig
if !testMode {
if err := cfg.Unpack(&config); err != nil {
return nil, err
}
}
if err := p.init(results, &config); err != nil {
return nil, err
}
return p, nil
}
func (mysql *mysqlPlugin) init(results protos.Reporter, config *mysqlConfig) error {
mysql.setFromConfig(config)
mysql.transactions = common.NewCache(
mysql.transactionTimeout,
protos.DefaultTransactionHashSize)
mysql.transactions.StartJanitor(mysql.transactionTimeout)
mysql.handleMysql = handleMysql
mysql.results = results
return nil
}
func (mysql *mysqlPlugin) setFromConfig(config *mysqlConfig) {
mysql.ports = config.Ports
mysql.maxRowLength = config.MaxRowLength
mysql.maxStoreRows = config.MaxRows
mysql.sendRequest = config.SendRequest
mysql.sendResponse = config.SendResponse
mysql.transactionTimeout = config.TransactionTimeout
}
func (mysql *mysqlPlugin) getTransaction(k common.HashableTCPTuple) *mysqlTransaction {
v := mysql.transactions.Get(k)
if v != nil {
return v.(*mysqlTransaction)
}
return nil
}
func (mysql *mysqlPlugin) GetPorts() []int {
return mysql.ports
}
func (stream *mysqlStream) prepareForNewMessage() {
stream.data = stream.data[stream.parseOffset:]
stream.parseState = mysqlStateStart
stream.parseOffset = 0
stream.isClient = false
stream.message = nil
}
func mysqlMessageParser(s *mysqlStream) (bool, bool) {
logp.Debug("mysqldetailed", "MySQL parser called. parseState = %s", s.parseState)
m := s.message
for s.parseOffset < len(s.data) {
switch s.parseState {
case mysqlStateStart:
m.start = s.parseOffset
if len(s.data[s.parseOffset:]) < 5 {
logp.Warn("MySQL Message too short. Ignore it.")
return false, false
}
hdr := s.data[s.parseOffset : s.parseOffset+5]
m.packetLength = uint32(hdr[0]) | uint32(hdr[1])<<8 | uint32(hdr[2])<<16
m.seq = hdr[3]
m.typ = hdr[4]
logp.Debug("mysqldetailed", "MySQL Header: Packet length %d, Seq %d, Type=%d", m.packetLength, m.seq, m.typ)
if m.seq == 0 {
// starts Command Phase
if m.typ == mysqlCmdQuery {
// parse request
m.isRequest = true
m.start = s.parseOffset
s.parseState = mysqlStateEatMessage
} else {
// ignore command
m.ignoreMessage = true
s.parseState = mysqlStateEatMessage
}
if !s.isClient {
s.isClient = true
}
} else if !s.isClient {
// parse response
m.isRequest = false
if hdr[4] == 0x00 || hdr[4] == 0xfe {
logp.Debug("mysqldetailed", "Received OK response")
m.start = s.parseOffset
s.parseState = mysqlStateEatMessage
m.isOK = true
} else if hdr[4] == 0xff {
logp.Debug("mysqldetailed", "Received ERR response")
m.start = s.parseOffset
s.parseState = mysqlStateEatMessage
m.isError = true
} else if m.packetLength == 1 {
logp.Debug("mysqldetailed", "Query response. Number of fields %d", hdr[4])
m.numberOfFields = int(hdr[4])
m.start = s.parseOffset
s.parseOffset += 5
s.parseState = mysqlStateEatFields
} else {
// something else. ignore
m.ignoreMessage = true
s.parseState = mysqlStateEatMessage
}
} else {
// something else, not expected
logp.Debug("mysql", "Unexpected MySQL message of type %d received.", m.typ)
return false, false
}
case mysqlStateEatMessage:
if len(s.data[s.parseOffset:]) < int(m.packetLength)+4 {
// wait for more data
return true, false
}
s.parseOffset += 4 //header
s.parseOffset += int(m.packetLength)
m.end = s.parseOffset
if m.isRequest {
m.query = string(s.data[m.start+5 : m.end])
} else if m.isOK {
// affected rows
affectedRows, off, complete, err := readLinteger(s.data, m.start+5)
if !complete {
return true, false
}
if err != nil {
logp.Debug("mysql", "Error on read_linteger: %s", err)
return false, false
}
m.affectedRows = affectedRows
// last insert id
insertID, _, complete, err := readLinteger(s.data, off)
if !complete {
return true, false
}
if err != nil {
logp.Debug("mysql", "Error on read_linteger: %s", err)
return false, false
}
m.insertID = insertID
} else if m.isError {
// int<1>header (0xff)
// int<2>error code
// string[1] sql state marker
// string[5] sql state
// string<EOF> error message
m.errorCode = uint16(s.data[m.start+6])<<8 | uint16(s.data[m.start+5])
m.errorInfo = string(s.data[m.start+8:m.start+13]) + ": " + string(s.data[m.start+13:])
}
m.size = uint64(m.end - m.start)
logp.Debug("mysqldetailed", "Message complete. remaining=%d",
len(s.data[s.parseOffset:]))
return true, true
case mysqlStateEatFields:
if len(s.data[s.parseOffset:]) < 4 {
// wait for more
return true, false
}
hdr := s.data[s.parseOffset : s.parseOffset+4]
m.packetLength = uint32(hdr[0]) | uint32(hdr[1])<<8 | uint32(hdr[2])<<16
m.seq = hdr[3]
logp.Debug("mysqldetailed", "Fields: packet length %d, packet number %d", m.packetLength, m.seq)
if len(s.data[s.parseOffset:]) >= int(m.packetLength)+4 {
s.parseOffset += 4 // header
if s.data[s.parseOffset] == 0xfe {
logp.Debug("mysqldetailed", "Received EOF packet")
// EOF marker
s.parseOffset += int(m.packetLength)
s.parseState = mysqlStateEatRows
} else {
_ /* catalog */, off, complete, err := readLstring(s.data, s.parseOffset)
if !complete {
return true, false
}
if err != nil {
logp.Debug("mysql", "Error on read_lstring: %s", err)
return false, false
}
db /*schema */, off, complete, err := readLstring(s.data, off)
if !complete {
return true, false
}
if err != nil {
logp.Debug("mysql", "Error on read_lstring: %s", err)
return false, false
}
table /* table */, _ /*off*/, complete, err := readLstring(s.data, off)
if !complete {
return true, false
}
if err != nil {
logp.Debug("mysql", "Error on read_lstring: %s", err)
return false, false
}
dbTable := string(db) + "." + string(table)
if len(m.tables) == 0 {
m.tables = dbTable
} else if !strings.Contains(m.tables, dbTable) {
m.tables = m.tables + ", " + dbTable
}
logp.Debug("mysqldetailed", "db=%s, table=%s", db, table)
s.parseOffset += int(m.packetLength)
// go to next field
}
} else {
// wait for more
return true, false
}
case mysqlStateEatRows:
if len(s.data[s.parseOffset:]) < 4 {
// wait for more
return true, false
}
hdr := s.data[s.parseOffset : s.parseOffset+4]
m.packetLength = uint32(hdr[0]) | uint32(hdr[1])<<8 | uint32(hdr[2])<<16
m.seq = hdr[3]
logp.Debug("mysqldetailed", "Rows: packet length %d, packet number %d", m.packetLength, m.seq)
if len(s.data[s.parseOffset:]) < int(m.packetLength)+4 {
// wait for more
return true, false
}
s.parseOffset += 4 //header
if s.data[s.parseOffset] == 0xfe {
logp.Debug("mysqldetailed", "Received EOF packet")
// EOF marker
s.parseOffset += int(m.packetLength)
if m.end == 0 {
m.end = s.parseOffset
} else {
m.isTruncated = true
}
if !m.isError {
// in case the response was sent successfully
m.isOK = true
}
m.size = uint64(m.end - m.start)
return true, true
}
s.parseOffset += int(m.packetLength)
if m.end == 0 && s.parseOffset > maxPayloadSize {
// only send up to here, but read until the end
m.end = s.parseOffset
}
m.numberOfRows++
// go to next row
}
}
return true, false
}
// messageGap is called when a gap of size `nbytes` is found in the
// tcp stream. Returns true if there is already enough data in the message
// read so far that we can use it further in the stack.
func (mysql *mysqlPlugin) messageGap(s *mysqlStream, nbytes int) (complete bool) {
m := s.message
switch s.parseState {
case mysqlStateStart, mysqlStateEatMessage:
// not enough data yet to be useful
return false
case mysqlStateEatFields, mysqlStateEatRows:
// enough data here
m.end = s.parseOffset
if m.isRequest {
m.notes = append(m.notes, "Packet loss while capturing the request")
} else {
m.notes = append(m.notes, "Packet loss while capturing the response")
}
return true
}
return true
}
type mysqlPrivateData struct {
data [2]*mysqlStream
}
// Called when the parser has identified a full message.
func (mysql *mysqlPlugin) messageComplete(tcptuple *common.TCPTuple, dir uint8, stream *mysqlStream) {
// all ok, ship it
msg := stream.data[stream.message.start:stream.message.end]
if !stream.message.ignoreMessage {
mysql.handleMysql(mysql, stream.message, tcptuple, dir, msg)
}
// and reset message
stream.prepareForNewMessage()
}
func (mysql *mysqlPlugin) ConnectionTimeout() time.Duration {
return mysql.transactionTimeout
}
func (mysql *mysqlPlugin) Parse(pkt *protos.Packet, tcptuple *common.TCPTuple,
dir uint8, private protos.ProtocolData) protos.ProtocolData {
defer logp.Recover("ParseMysql exception")
priv := mysqlPrivateData{}
if private != nil {
var ok bool
priv, ok = private.(mysqlPrivateData)
if !ok {
priv = mysqlPrivateData{}
}
}
if priv.data[dir] == nil {
priv.data[dir] = &mysqlStream{
data: pkt.Payload,
message: &mysqlMessage{ts: pkt.Ts},
}
} else {
// concatenate bytes
priv.data[dir].data = append(priv.data[dir].data, pkt.Payload...)
if len(priv.data[dir].data) > tcp.TCPMaxDataInStream {
logp.Debug("mysql", "Stream data too large, dropping TCP stream")
priv.data[dir] = nil
return priv
}
}
stream := priv.data[dir]
for len(stream.data) > 0 {
if stream.message == nil {
stream.message = &mysqlMessage{ts: pkt.Ts}
}
ok, complete := mysqlMessageParser(priv.data[dir])
//logp.Debug("mysqldetailed", "mysqlMessageParser returned ok=%b complete=%b", ok, complete)
if !ok {
// drop this tcp stream. Will retry parsing with the next
// segment in it
priv.data[dir] = nil
logp.Debug("mysql", "Ignore MySQL message. Drop tcp stream. Try parsing with the next segment")
return priv
}
if complete {
mysql.messageComplete(tcptuple, dir, stream)
} else {
// wait for more data
break
}
}
return priv
}
func (mysql *mysqlPlugin) GapInStream(tcptuple *common.TCPTuple, dir uint8,
nbytes int, private protos.ProtocolData) (priv protos.ProtocolData, drop bool) {
defer logp.Recover("GapInStream(mysql) exception")
if private == nil {
return private, false
}
mysqlData, ok := private.(mysqlPrivateData)
if !ok {
return private, false
}
stream := mysqlData.data[dir]
if stream == nil || stream.message == nil {
// nothing to do
return private, false
}
if mysql.messageGap(stream, nbytes) {
// we need to publish from here
mysql.messageComplete(tcptuple, dir, stream)
}
// we always drop the TCP stream. Because it's binary and len based,
// there are too few cases in which we could recover the stream (maybe
// for very large blobs, leaving that as TODO)
return private, true
}
func (mysql *mysqlPlugin) ReceivedFin(tcptuple *common.TCPTuple, dir uint8,
private protos.ProtocolData) protos.ProtocolData {
// TODO: check if we have data pending and either drop it to free
// memory or send it up the stack.
return private
}
func handleMysql(mysql *mysqlPlugin, m *mysqlMessage, tcptuple *common.TCPTuple,
dir uint8, rawMsg []byte) {
m.tcpTuple = *tcptuple
m.direction = dir
m.cmdlineTuple = procs.ProcWatcher.FindProcessesTuple(tcptuple.IPPort())
m.raw = rawMsg
if m.isRequest {
mysql.receivedMysqlRequest(m)
} else {
mysql.receivedMysqlResponse(m)
}
}
func (mysql *mysqlPlugin) receivedMysqlRequest(msg *mysqlMessage) {
tuple := msg.tcpTuple
trans := mysql.getTransaction(tuple.Hashable())
if trans != nil {
if trans.mysql != nil {
logp.Debug("mysql", "Two requests without a Response. Dropping old request: %s", trans.mysql)
unmatchedRequests.Add(1)
}
} else {
trans = &mysqlTransaction{tuple: tuple}
mysql.transactions.Put(tuple.Hashable(), trans)
}
trans.ts = msg.ts
trans.src = common.Endpoint{
IP: msg.tcpTuple.SrcIP.String(),
Port: msg.tcpTuple.SrcPort,
Proc: string(msg.cmdlineTuple.Src),
}
trans.dst = common.Endpoint{
IP: msg.tcpTuple.DstIP.String(),
Port: msg.tcpTuple.DstPort,
Proc: string(msg.cmdlineTuple.Dst),
}
if msg.direction == tcp.TCPDirectionReverse {
trans.src, trans.dst = trans.dst, trans.src
}
// Extract the method, by simply taking the first word and
// making it upper case.
query := strings.Trim(msg.query, " \r\n\t")
index := strings.IndexAny(query, " \r\n\t")
var method string
if index > 0 {
method = strings.ToUpper(query[:index])
} else {
method = strings.ToUpper(query)
}
trans.query = query
trans.method = method
trans.mysql = common.MapStr{}
trans.notes = msg.notes
// save Raw message
trans.requestRaw = msg.query
trans.bytesIn = msg.size
}
func (mysql *mysqlPlugin) receivedMysqlResponse(msg *mysqlMessage) {
trans := mysql.getTransaction(msg.tcpTuple.Hashable())
if trans == nil {
logp.Debug("mysql", "Response from unknown transaction. Ignoring.")
unmatchedResponses.Add(1)
return
}
// check if the request was received
if trans.mysql == nil {
logp.Debug("mysql", "Response from unknown transaction. Ignoring.")
unmatchedResponses.Add(1)
return
}
// save json details
trans.mysql.Update(common.MapStr{
"affected_rows": msg.affectedRows,
"insert_id": msg.insertID,
"num_rows": msg.numberOfRows,
"num_fields": msg.numberOfFields,
"iserror": msg.isError,
"error_code": msg.errorCode,
"error_message": msg.errorInfo,
})
trans.bytesOut = msg.size
trans.path = msg.tables
trans.responseTime = int32(msg.ts.Sub(trans.ts).Nanoseconds() / 1e6) // resp_time in milliseconds
// save Raw message
if len(msg.raw) > 0 {
fields, rows := mysql.parseMysqlResponse(msg.raw)
trans.responseRaw = common.DumpInCSVFormat(fields, rows)
}
trans.notes = append(trans.notes, msg.notes...)
mysql.publishTransaction(trans)
mysql.transactions.Delete(trans.tuple.Hashable())
logp.Debug("mysql", "Mysql transaction completed: %s", trans.mysql)
logp.Debug("mysql", "%s", trans.responseRaw)
}
func (mysql *mysqlPlugin) parseMysqlResponse(data []byte) ([]string, [][]string) {
length, err := readLength(data, 0)
if err != nil {
logp.Warn("Invalid response: %v", err)
return []string{}, [][]string{}
}
if length < 1 {
logp.Warn("Warning: Skipping empty Response")
return []string{}, [][]string{}
}
fields := []string{}
rows := [][]string{}
if len(data) < 5 {
logp.Warn("Invalid response: data less than 4 bytes")
return []string{}, [][]string{}
}
if data[4] == 0x00 {
// OK response
} else if data[4] == 0xff {
// Error response
} else {
offset := 5
logp.Debug("mysql", "Data len: %d", len(data))
// Read fields
for {
length, err = readLength(data, offset)
if err != nil {
logp.Warn("Invalid response: %v", err)
return []string{}, [][]string{}
}
if len(data[offset:]) < 5 {
logp.Warn("Invalid response.")
return []string{}, [][]string{}
}
if data[offset+4] == 0xfe {
// EOF
offset += length + 4
break
}
_ /* catalog */, off, complete, err := readLstring(data, offset+4)
if err != nil || !complete {
logp.Debug("mysql", "Reading field: %v %v", err, complete)
return fields, rows
}
_ /*database*/, off, complete, err = readLstring(data, off)
if err != nil || !complete {
logp.Debug("mysql", "Reading field: %v %v", err, complete)
return fields, rows
}
_ /*table*/, off, complete, err = readLstring(data, off)
if err != nil || !complete {
logp.Debug("mysql", "Reading field: %v %v", err, complete)
return fields, rows
}
_ /*org table*/, off, complete, err = readLstring(data, off)
if err != nil || !complete {
logp.Debug("mysql", "Reading field: %v %v", err, complete)
return fields, rows
}
name, off, complete, err := readLstring(data, off)
if err != nil || !complete {
logp.Debug("mysql", "Reading field: %v %v", err, complete)
return fields, rows
}
_ /* org name */, _ /*off*/, complete, err = readLstring(data, off)
if err != nil || !complete {
logp.Debug("mysql", "Reading field: %v %v", err, complete)
return fields, rows
}
fields = append(fields, string(name))
offset += length + 4
if len(data) < offset {
logp.Warn("Invalid response.")
return []string{}, [][]string{}
}
}
// Read rows
for offset < len(data) {
var row []string
var rowLen int
if len(data[offset:]) < 5 {
logp.Warn("Invalid response.")
break
}
if data[offset+4] == 0xfe {
// EOF
offset += length + 4
break
}
length, err = readLength(data, offset)
if err != nil {
logp.Warn("Invalid response: %v", err)
break
}
off := offset + 4 // skip length + packet number
start := off
for off < start+length {
var text []byte
if data[off] == 0xfb {
text = []byte("NULL")
off++
} else {
var err error
var complete bool
text, off, complete, err = readLstring(data, off)
if err != nil || !complete {
logp.Debug("mysql", "Error parsing rows: %s %b", err, complete)
// nevertheless, return what we have so far
return fields, rows
}
}
if rowLen < mysql.maxRowLength {
if rowLen+len(text) > mysql.maxRowLength {
text = text[:mysql.maxRowLength-rowLen]
}
row = append(row, string(text))
rowLen += len(text)
}
}
logp.Debug("mysqldetailed", "Append row: %v", row)
rows = append(rows, row)
if len(rows) >= mysql.maxStoreRows {
break
}
offset += length + 4
}
}
return fields, rows
}
func (mysql *mysqlPlugin) publishTransaction(t *mysqlTransaction) {
if mysql.results == nil {
return
}
logp.Debug("mysql", "mysql.results exists")
fields := common.MapStr{}
fields["type"] = "mysql"
if t.mysql["iserror"].(bool) {
fields["status"] = common.ERROR_STATUS
} else {
fields["status"] = common.OK_STATUS
}
fields["responsetime"] = t.responseTime
if mysql.sendRequest {
fields["request"] = t.requestRaw
}
if mysql.sendResponse {
fields["response"] = t.responseRaw
}
fields["method"] = t.method
fields["query"] = t.query
fields["mysql"] = t.mysql
fields["path"] = t.path
fields["bytes_out"] = t.bytesOut
fields["bytes_in"] = t.bytesIn
if len(t.notes) > 0 {
fields["notes"] = t.notes
}
fields["src"] = &t.src
fields["dst"] = &t.dst
mysql.results(beat.Event{
Timestamp: t.ts,
Fields: fields,
})
}
func readLstring(data []byte, offset int) ([]byte, int, bool, error) {
length, off, complete, err := readLinteger(data, offset)
if err != nil {
return nil, 0, false, err
}
if !complete || len(data[off:]) < int(length) {
return nil, 0, false, nil
}
return data[off : off+int(length)], off + int(length), true, nil
}
func readLinteger(data []byte, offset int) (uint64, int, bool, error) {
if len(data) < offset+1 {
return 0, 0, false, nil
}
switch data[offset] {
case 0xfe:
if len(data[offset+1:]) < 8 {
return 0, 0, false, nil
}
return uint64(data[offset+1]) | uint64(data[offset+2])<<8 |
uint64(data[offset+2])<<16 | uint64(data[offset+3])<<24 |
uint64(data[offset+4])<<32 | uint64(data[offset+5])<<40 |
uint64(data[offset+6])<<48 | uint64(data[offset+7])<<56,
offset + 9, true, nil
case 0xfd:
if len(data[offset+1:]) < 3 {
return 0, 0, false, nil
}
return uint64(data[offset+1]) | uint64(data[offset+2])<<8 |
uint64(data[offset+3])<<16, offset + 4, true, nil
case 0xfc:
if len(data[offset+1:]) < 2 {
return 0, 0, false, nil
}
return uint64(data[offset+1]) | uint64(data[offset+2])<<8, offset + 3, true, nil
}
if uint64(data[offset]) >= 0xfb {
return 0, 0, false, fmt.Errorf("Unexpected value in read_linteger")
}
return uint64(data[offset]), offset + 1, true, nil
}
// Read a mysql length field (3 bytes LE)
func readLength(data []byte, offset int) (int, error) {
if len(data[offset:]) < 3 {
return 0, errors.New("Data too small to contain a valid length")
}
length := uint32(data[offset]) |
uint32(data[offset+1])<<8 |
uint32(data[offset+2])<<16
return int(length), nil
}
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