/
entry.go
286 lines (232 loc) · 5.39 KB
/
entry.go
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package build
import (
"bytes"
"encoding/binary"
"fmt"
"github.com/google/gopacket"
"io"
"strconv"
)
const (
Port = 27017
Version = "0.1"
CmdPort = "-p"
)
type Mongodb struct {
port int
version string
source map[string]*stream
}
type stream struct {
packets chan *packet
}
type packet struct {
isClientFlow bool //client->server
messageLength int
requestID int
responseTo int
opCode int //request type
payload io.Reader
}
var mongodbInstance *Mongodb
func NewInstance() *Mongodb {
if mongodbInstance == nil {
mongodbInstance = &Mongodb{
port :Port,
version:Version,
source: make(map[string]*stream),
}
}
return mongodbInstance
}
func (m *Mongodb) SetFlag(flg []string) {
c := len(flg)
if c == 0 {
return
}
if c >> 1 != 1 {
panic("ERR : Mongodb Number of parameters")
}
for i:=0;i<c;i=i+2 {
key := flg[i]
val := flg[i+1]
switch key {
case CmdPort:
p, err := strconv.Atoi(val);
if err != nil {
panic("ERR : port")
}
mongodbInstance.port = p
if p < 0 || p > 65535 {
panic("ERR : port(0-65535)")
}
break
default:
panic("ERR : mysql's params")
}
}
}
func (m *Mongodb) BPFFilter() string {
return "tcp and port "+strconv.Itoa(m.port);
}
func (m *Mongodb) Version() string {
return m.version
}
func (m *Mongodb) ResolveStream(net, transport gopacket.Flow, buf io.Reader) {
//uuid
uuid := fmt.Sprintf("%v:%v", net.FastHash(), transport.FastHash())
//resolve packet
if _, ok := m.source[uuid]; !ok {
var newStream = stream {
packets:make(chan *packet, 100),
}
m.source[uuid] = &newStream
go newStream.resolve()
}
//read bi-directional packet
//server -> client || client -> server
for {
newPacket := m.newPacket(net, transport, buf)
if newPacket == nil {
return
}
m.source[uuid].packets <- newPacket
}
}
func (m *Mongodb) newPacket(net, transport gopacket.Flow, r io.Reader) *packet {
//read packet
var packet *packet
var err error
packet, err = readStream(r)
//stream close
if err == io.EOF {
fmt.Println(net, transport, " close")
return nil
} else if err != nil {
fmt.Println("ERR : Unknown stream", net, transport, ":", err)
return nil
}
//set flow direction
if transport.Src().String() == strconv.Itoa(m.port) {
packet.isClientFlow = false
}else{
packet.isClientFlow = true
}
return packet
}
func (stm *stream) resolve() {
for {
select {
case packet := <- stm.packets:
if packet.isClientFlow {
stm.resolveClientPacket(packet)
} else {
stm.resolveServerPacket(packet)
}
}
}
}
func (stm *stream) resolveServerPacket(pk *packet) {
return
}
func (stm *stream) resolveClientPacket(pk *packet) {
var msg string
switch pk.opCode {
case OP_UPDATE:
zero := ReadInt32(pk.payload)
fullCollectionName := ReadString(pk.payload)
flags := ReadInt32(pk.payload)
selector := ReadBson2Json(pk.payload)
update := ReadBson2Json(pk.payload)
_ = zero
_ = flags
msg = fmt.Sprintf(" [Update] [coll:%s] %v %v",
fullCollectionName,
selector,
update,
)
case OP_INSERT:
flags := ReadInt32(pk.payload)
fullCollectionName := ReadString(pk.payload)
command := ReadBson2Json(pk.payload)
_ = flags
msg = fmt.Sprintf(" [Insert] [coll:%s] %v",
fullCollectionName,
command,
)
case OP_QUERY:
flags := ReadInt32(pk.payload)
fullCollectionName := ReadString(pk.payload)
numberToSkip := ReadInt32(pk.payload)
numberToReturn := ReadInt32(pk.payload)
_ = flags
_ = numberToSkip
_ = numberToReturn
command := ReadBson2Json(pk.payload)
selector := ReadBson2Json(pk.payload)
msg = fmt.Sprintf(" [Query] [coll:%s] %v %v",
fullCollectionName,
command,
selector,
)
case OP_COMMAND:
database := ReadString(pk.payload)
commandName := ReadString(pk.payload)
metaData := ReadBson2Json(pk.payload)
commandArgs := ReadBson2Json(pk.payload)
inputDocs := ReadBson2Json(pk.payload)
msg = fmt.Sprintf(" [Commend] [DB:%s] [Cmd:%s] %v %v %v",
database,
commandName,
metaData,
commandArgs,
inputDocs,
)
case OP_GET_MORE:
zero := ReadInt32(pk.payload)
fullCollectionName := ReadString(pk.payload)
numberToReturn := ReadInt32(pk.payload)
cursorId := ReadInt64(pk.payload)
_ = zero
msg = fmt.Sprintf(" [Query more] [coll:%s] [num of reply:%v] [cursor:%v]",
fullCollectionName,
numberToReturn,
cursorId,
)
case OP_DELETE:
zero := ReadInt32(pk.payload)
fullCollectionName := ReadString(pk.payload)
flags := ReadInt32(pk.payload)
selector := ReadBson2Json(pk.payload)
_ = zero
_ = flags
msg = fmt.Sprintf(" [Delete] [coll:%s] %v",
fullCollectionName,
selector,
)
case OP_MSG:
return
default:
return
}
fmt.Println(GetNowStr(true) + msg)
}
func readStream(r io.Reader) (*packet, error) {
var buf bytes.Buffer
p := &packet{}
//header
header := make([]byte, 16)
if _, err := io.ReadFull(r, header); err != nil {
return nil,err
}
// message length
payloadLen := binary.LittleEndian.Uint32(header[0:4]) - 16
p.messageLength = int(payloadLen)
// opCode
p.opCode = int(binary.LittleEndian.Uint32(header[12:]))
if p.messageLength != 0 {
io.CopyN(&buf, r, int64(payloadLen))
}
p.payload = bytes.NewReader(buf.Bytes())
return p, nil
}