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tasker.go
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tasker.go
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package main
import (
"context"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"os"
"os/exec"
"strconv"
"sync"
"syscall"
"time"
"github.com/google/uuid"
log "github.com/sirupsen/logrus"
"github.com/neuvector/neuvector/share"
"github.com/neuvector/neuvector/share/system"
"github.com/neuvector/scanner/common"
)
const reqTemplate = "/tmp/%s_i.json"
const resTemplate = "/tmp/%s_o.json"
/////
type Tasker struct {
bEnable bool
bShowDebug bool
mutex sync.Mutex
taskPath string
rtSock string // Container socket URL
sys *system.SystemTools
maxCacherRecordSize int64
}
/////
func newTasker(taskPath, rtSock string, showDebug bool, sys *system.SystemTools, maxCacherRecordSize int64) *Tasker {
log.WithFields(log.Fields{"showDebug": showDebug}).Debug()
return &Tasker{
bEnable: true,
taskPath: taskPath, // sannnerTask path
rtSock: rtSock, // Container socket URL
bShowDebug: showDebug,
sys: sys,
maxCacherRecordSize: maxCacherRecordSize, // MB
}
}
//////
func (ts *Tasker) putInputFile(request interface{}) (string, []string, error) {
var args []string
var uid string
var data []byte
switch request.(type) {
case share.ScanImageRequest:
req := request.(share.ScanImageRequest)
data, _ = json.Marshal(req)
args = append(args, "-t", "reg")
args = append(args, "-u", ts.rtSock)
args = append(args, "-maxrec", strconv.FormatInt(ts.maxCacherRecordSize, 10))
case share.ScanAppRequest:
req := request.(share.ScanAppRequest)
data, _ = json.Marshal(req)
args = append(args, "-t", "pkg")
case share.ScanData:
req := request.(share.ScanData)
data, _ = json.Marshal(req)
args = append(args, "-t", "dat")
case share.ScanAwsLambdaRequest:
req := request.(share.ScanAwsLambdaRequest)
data, _ = json.Marshal(req)
args = append(args, "-t", "awl")
default:
return "", args, errors.New("Invalid type")
}
if ts.bShowDebug {
args = append(args, "-x")
}
/// lock the allocation
ts.mutex.Lock()
defer ts.mutex.Unlock()
for i := 0; i < 256; i++ {
uid = uuid.New().String()
input := fmt.Sprintf(reqTemplate, uid)
if _, err := os.Stat(input); err != nil { // not existed
if err = ioutil.WriteFile(input, data, 0644); err == nil {
args = append(args, "-i", input)
args = append(args, "-o", fmt.Sprintf(resTemplate, uid))
return uid, args, nil
}
}
}
return uid, args, errors.New("Failed to allocate")
}
/////
func (ts *Tasker) getResultFile(uid string) (*share.ScanResult, error) {
jsonFile, err := os.Open(fmt.Sprintf(resTemplate, uid))
if err != nil {
log.WithFields(log.Fields{"error": err, "uid": uid}).Error("Failed to open result")
return nil, err
}
byteValue, _ := ioutil.ReadAll(jsonFile)
jsonFile.Close()
var res share.ScanResult
if err = json.Unmarshal(byteValue, &res); err != nil {
log.WithFields(log.Fields{"error": err}).Error("Failed to parse result")
return nil, err
}
log.Debug("Completed")
return &res, nil
}
//////
func (ts *Tasker) Run(ctx context.Context, request interface{}) (*share.ScanResult, error) {
if !ts.bEnable {
return nil, fmt.Errorf("session ended")
}
log.Debug()
uid, args, err := ts.putInputFile(request)
if err != nil {
log.WithFields(log.Fields{"err": err}).Error()
return nil, err
}
// remove files
defer os.Remove(fmt.Sprintf(reqTemplate, uid))
defer os.Remove(fmt.Sprintf(resTemplate, uid))
// image working folder
workingFolder := common.CreateImagePath(uid)
defer os.RemoveAll(workingFolder)
log.WithFields(log.Fields{"cmd": ts.taskPath, "wpath": workingFolder, "args": args}).Debug()
//////
cmd := exec.Command(ts.taskPath, args...)
cmd.SysProcAttr = &syscall.SysProcAttr{Setsid: true}
if ts.bShowDebug {
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
}
if err := cmd.Start(); err != nil {
log.WithFields(log.Fields{"error": err}).Error("Start")
return nil, err
}
pgid := cmd.Process.Pid
// log.WithFields(log.Fields{"pid": pgid}).Debug()
ts.sys.AddToolProcess(pgid, 0, "Run", uid)
ctxError := false
bRunning := true
go func() {
for bRunning {
if ctx.Err() != nil { // context.Canceled: remote cancelled
ctxError = true
// log.WithFields(log.Fields{"error": ctx.Err()}).Error("gRpc")
ts.sys.RemoveToolProcess(pgid, true) // kill it
return
}
time.Sleep(time.Millisecond * 250)
}
}()
err = cmd.Wait()
bRunning = false
if ctxError {
err = ctx.Err()
} else {
ts.sys.RemoveToolProcess(pgid, false)
}
if err != nil {
log.WithFields(log.Fields{"error": err}).Error("Done")
return nil, err
}
return ts.getResultFile(uid)
}
/////
func (ts *Tasker) Close() {
log.Debug()
ts.mutex.Lock()
defer ts.mutex.Unlock()
ts.bEnable = false
//
ts.sys.ShowToolProcesses()
ts.sys.StopToolProcesses()
}