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package handlers
import (
"context"
"errors"
"fmt"
"io/ioutil"
"os"
"os/exec"
"strings"
"sync"
"time"
"github.com/mimecast/dtail/internal/config"
"github.com/mimecast/dtail/internal/io/logger"
"github.com/mimecast/dtail/internal/io/run"
)
type runCommand struct {
server *ServerHandler
run run.Run
}
func newRunCommand(server *ServerHandler) runCommand {
return runCommand{
server: server,
}
}
func (r runCommand) StartBackground(ctx context.Context, wg *sync.WaitGroup, argc int, args, outerArgs []string) error {
if argc < 2 {
return fmt.Errorf("%s: args:%v argc:%d", commandParseWarning, args, argc)
}
ec := make(chan int, 1)
var pid int
var err error
command := strings.Join(args[1:], " ")
if strings.Contains(command, ";") || strings.Contains(command, "\n") {
if pid, err = r.startScript(ctx, wg, ec, command, outerArgs); err != nil {
r.server.sendServerMessage(".run exitstatus 255")
return err
}
return nil
}
if pid, err = r.start(ctx, wg, ec, strings.TrimSpace(command), outerArgs); err != nil {
r.server.sendServerMessage(".run exitstatus 255")
return err
}
exitCode := <-ec
r.server.sendServerMessage(fmt.Sprintf(".run exitstatus %d", exitCode))
r.server.sendServerMessage(logger.Info(fmt.Sprintf("Process %d exited with status %d", pid, exitCode)))
return nil
}
func (r runCommand) startScript(ctx context.Context, wg *sync.WaitGroup, ec chan<- int, script string, outerArgs []string) (int, error) {
if _, err := os.Stat(config.Common.TmpDir); os.IsNotExist(err) {
return -1, err
}
timestamp := time.Now().UnixNano()
scriptPath := fmt.Sprintf("%s/%s_%v.sh", config.Common.TmpDir, r.server.user.Name, timestamp)
// TODO: On dserver startup delete all previously written scripts (there might be left overs due to a crash or so)
logger.Debug(r.server.user, "Writing temp script", scriptPath)
script = fmt.Sprintf("#!/bin/sh\n%s", script)
if err := ioutil.WriteFile(scriptPath, []byte(script), 0700); err != nil {
return -1, err
}
pid, err := r.start(ctx, wg, ec, scriptPath, outerArgs)
go func() {
wg.Wait()
logger.Debug("Deleting script", scriptPath)
os.Remove(scriptPath)
}()
return pid, err
}
func (r runCommand) start(ctx context.Context, wg *sync.WaitGroup, ec chan<- int, command string, outerArgs []string) (int, error) {
if len(command) == 0 {
return -1, errors.New("Empty command provided")
}
splitted := strings.Split(command, " ")
path := splitted[0]
args := splitted[1:]
args = append(args, outerArgs...)
qualifiedPath, err := exec.LookPath(path)
if err != nil {
return -1, err
}
if !r.server.user.HasFilePermission(qualifiedPath, "runcommands") {
return -1, fmt.Errorf("No permission to execute path: %s", qualifiedPath)
}
r.run = run.New(qualifiedPath, args)
pid, err := r.run.StartBackground(ctx, wg, ec, r.server.lines)
if err != nil {
return pid, err
}
return pid, nil
}
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