/
tidb_sql.go
302 lines (264 loc) · 8.05 KB
/
tidb_sql.go
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// https://dev.mysql.com/doc/internals/en/client-server-protocol.html
// https://dev.mysql.com/doc/dev/mysql-server/latest/PAGE_PROTOCOL.html
package main
import (
"bufio"
"encoding/binary"
"flag"
"fmt"
"io"
"log"
"strconv"
"time"
"github.com/july2993/tidb_sql/mysql"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/google/gopacket/pcap"
"github.com/google/gopacket/tcpassembly"
"github.com/google/gopacket/tcpassembly/tcpreader"
)
var iface = flag.String("i", "eth0", "Interface to get packets from")
var tidbPort = flag.Int("port", 4000, "port of tidb-server or mysql")
func init() {
log.SetFlags(log.LstdFlags | log.Lshortfile)
}
type mysqlStreamFactory struct {
source map[string]*mysqlStream
}
type packet struct {
seq uint8
payload []byte
}
type mysqlStream struct {
net, transport gopacket.Flow
r tcpreader.ReaderStream
stmtID2query map[uint32]*mysql.Stmt
packets chan *packet
}
func (m *mysqlStreamFactory) New(net, transport gopacket.Flow) tcpassembly.Stream {
mstream := &mysqlStream{
net: net,
transport: transport,
r: tcpreader.NewReaderStream(),
stmtID2query: make(map[uint32]*mysql.Stmt),
packets: make(chan *packet, 1024),
}
log.Println("new stream ", net, transport)
go mstream.readPackets()
key := fmt.Sprintf("%v:%v", net, transport)
rev_key := fmt.Sprintf("%v:%v", net.Reverse(), transport.Reverse())
// server to client stream
if transport.Src().String() == strconv.Itoa(*tidbPort) {
if client, ok := m.source[rev_key]; ok {
log.Println("run ", rev_key)
go client.runClient(mstream.packets)
delete(m.source, rev_key)
} else {
// wait client stream
m.source[key] = mstream
}
} else { // client to server stream
if server, ok := m.source[rev_key]; ok {
log.Println("run ", key)
go mstream.runClient(server.packets)
delete(m.source, rev_key)
} else {
// wait server stream
m.source[key] = mstream
}
}
// ReaderStream implements tcpassembly.Stream, so we can return a pointer to it.
return &mstream.r
}
func (m *mysqlStream) readPackets() {
buf := bufio.NewReader(&m.r)
for {
seq, pk, err := mysql.ReadPacket(buf)
if err == io.EOF {
log.Println(m.net, m.transport, " leave")
close(m.packets)
return
} else if err != nil {
log.Println("Error reading stream", m.net, m.transport, ":", err)
close(m.packets)
} else {
// log.Println("Received package from stream", m.net, m.transport, " seq: ", seq, " pk:", pk)
}
m.packets <- &packet{seq: seq, payload: pk}
}
}
// for simplicy, does'n parse server response according to request
// just skip to the first response packet to try get response stmt_id now
func skip2Seq(srv chan *packet, seq uint8) *packet {
for {
select {
case pk, ok := <-srv:
if !ok {
return nil
}
if pk.seq == seq {
return pk
}
case <-time.After(5 * time.Second):
return nil
}
}
}
func (m *mysqlStream) handlePacket(seq uint8, payload []byte, srvPackets chan *packet) {
// text protocol command can just print it out
// https://dev.mysql.com/doc/internals/en/text-protocol.html
srvPK := skip2Seq(srvPackets, seq+1)
switch payload[0] {
// 131, 141 for handkshake
// https://dev.mysql.com/doc/internals/en/connection-phase-packets.html#packet-Protocol::Handshake
case 131, 141:
// some old client may still use this, print it in sql query way
case mysql.COM_INIT_DB:
fmt.Printf("use %s;\n", payload[1:])
case mysql.COM_DROP_DB:
fmt.Printf("DROP DATABASE %s;\n", payload[1:])
case mysql.COM_CREATE_DB:
fmt.Printf("CREATE DATABASE %s;\n", payload[1:])
// just print the query
case mysql.COM_QUERY:
fmt.Printf("%s;\n", payload[1:])
// prepare statements
// https://dev.mysql.com/doc/internals/en/prepared-statements.html
case mysql.COM_STMT_PREPARE:
// find the return stmt_id, so we can know which prepare stmt execute later
if srvPK == nil {
log.Println("can't find resp packet from prepare")
return
}
// https://dev.mysql.com/doc/internals/en/com-stmt-prepare-response.html#packet-COM_STMT_PREPARE_OK
if srvPK.payload[0] != 0 {
log.Println("prepare fail")
return
}
stmtID := binary.LittleEndian.Uint32(srvPK.payload[1:5])
stmt := &mysql.Stmt{
ID: stmtID,
Query: string(payload[1:]),
}
m.stmtID2query[stmtID] = stmt
stmt.Columns = binary.LittleEndian.Uint16(srvPK.payload[5:7])
stmt.Params = binary.LittleEndian.Uint16(srvPK.payload[7:9])
stmt.Args = make([]interface{}, stmt.Params)
log.Println("prepare stmt: ", *stmt)
case mysql.COM_STMT_SEND_LONG_DATA:
// https://dev.mysql.com/doc/internals/en/com-stmt-send-long-data.html
stmtID := binary.LittleEndian.Uint32(payload[1:5])
paramId := binary.LittleEndian.Uint16(payload[5:7])
stmt, ok := m.stmtID2query[stmtID]
if !ok {
return
}
if paramId >= stmt.Params {
return
}
if stmt.Args[paramId] == nil {
stmt.Args[paramId] = payload[7:]
} else {
if b, ok := stmt.Args[paramId].([]byte); ok {
b = append(b, payload[7:]...)
stmt.Args[paramId] = b
}
}
case mysql.COM_STMT_RESET:
// https://dev.mysql.com/doc/internals/en/com-stmt-reset.html
stmtID := binary.LittleEndian.Uint32(payload[1:5])
stmt, ok := m.stmtID2query[stmtID]
if !ok {
return
}
stmt.Args = make([]interface{}, stmt.Params)
case mysql.COM_STMT_EXECUTE:
// https://dev.mysql.com/doc/internals/en/com-stmt-execute.html
idx := 1
stmtID := binary.LittleEndian.Uint32(payload[idx : idx+4])
idx += 4
var stmt *mysql.Stmt
var ok bool
if stmt, ok = m.stmtID2query[stmtID]; ok == false {
log.Println("not found stmt id query: ", stmtID)
return
}
fmt.Printf("# exec prepare stmt: %s;\n", stmt.Query)
// parse params
flags := payload[idx]
_ = flags
idx += 1
// skip iterater_count alwasy 1
_ = binary.LittleEndian.Uint32(payload[idx : idx+4])
idx += 4
if stmt.Params > 0 {
len := int((stmt.Params + 7) / 8)
nullBitmap := payload[idx : idx+len]
idx += len
newParamsBoundFlag := payload[idx]
idx += 1
var paramTypes []byte
var paramValues []byte
if newParamsBoundFlag == 1 {
paramTypes = payload[idx : idx+int(stmt.Params)*2]
idx += int(stmt.Params) * 2
paramValues = payload[idx:]
}
err := stmt.BindStmtArgs(nullBitmap, paramTypes, paramValues)
if err != nil {
log.Println("bind args err: ", err)
return
}
}
// log.Println("exec smmt: ", *stmt)
fmt.Println("# binary exec a prepare stmt rewrite it like: ")
fmt.Println(string(stmt.WriteToText()))
case mysql.COM_STMT_CLOSE:
// https://dev.mysql.com/doc/internals/en/com-stmt-close.html
// delete the stmt will not be use any more
stmtID := binary.LittleEndian.Uint32(payload[1:5])
delete(m.stmtID2query, stmtID)
default:
}
}
func (m *mysqlStream) runClient(srv chan *packet) {
for packet := range m.packets {
m.handlePacket(packet.seq, packet.payload, srv)
}
}
func main() {
flag.Parse()
var handle *pcap.Handle
var err error
if handle, err = pcap.OpenLive(*iface, 1600, true, pcap.BlockForever); err != nil {
panic(err)
} else if err := handle.SetBPFFilter(fmt.Sprintf("tcp and port %d", *tidbPort)); err != nil {
panic(err)
}
// Set up assembly
streamFactory := &mysqlStreamFactory{source: make(map[string]*mysqlStream)}
streamPool := tcpassembly.NewStreamPool(streamFactory)
assembler := tcpassembly.NewAssembler(streamPool)
// Read in packets, pass to assembler.
packetSource := gopacket.NewPacketSource(handle, handle.LinkType())
packets := packetSource.Packets()
ticker := time.Tick(time.Minute)
for {
select {
case packet := <-packets:
if packet == nil {
return
}
// log.Println(packet)
if packet.NetworkLayer() == nil || packet.TransportLayer() == nil || packet.TransportLayer().LayerType() != layers.LayerTypeTCP {
log.Println("Unusable packet")
continue
}
tcp := packet.TransportLayer().(*layers.TCP)
assembler.AssembleWithTimestamp(packet.NetworkLayer().NetworkFlow(), tcp, packet.Metadata().Timestamp)
case <-ticker:
// Every Minus, flush connections that haven't seen activity in the past 2 Minute.
assembler.FlushOlderThan(time.Now().Add(time.Minute * -2))
}
}
}