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7023b63ffa
- Set CREATE_NEW_PROCESS_GROUP for Windows subprocess. - Ensure we only kill actual process that need to.
112 lines
3.3 KiB
Go
112 lines
3.3 KiB
Go
// +build windows
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package executor
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import (
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"fmt"
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"io"
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"os"
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"syscall"
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syslog "github.com/RackSec/srslog"
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"github.com/hashicorp/nomad/client/driver/logging"
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)
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func (e *UniversalExecutor) LaunchSyslogServer() (*SyslogServerState, error) {
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// Ensure the context has been set first
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if e.ctx == nil {
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return nil, fmt.Errorf("SetContext must be called before launching the Syslog Server")
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}
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e.syslogChan = make(chan *logging.SyslogMessage, 2048)
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l, err := e.getListener(e.ctx.PortLowerBound, e.ctx.PortUpperBound)
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if err != nil {
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return nil, err
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}
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e.logger.Printf("[DEBUG] syslog-server: launching syslog server on addr: %v", l.Addr().String())
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if err := e.configureLoggers(); err != nil {
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return nil, err
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}
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e.syslogServer = logging.NewSyslogServer(l, e.syslogChan, e.logger)
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go e.syslogServer.Start()
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go e.collectLogs(e.lre, e.lro)
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syslogAddr := fmt.Sprintf("%s://%s", l.Addr().Network(), l.Addr().String())
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return &SyslogServerState{Addr: syslogAddr}, nil
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}
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func (e *UniversalExecutor) collectLogs(we io.Writer, wo io.Writer) {
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for logParts := range e.syslogChan {
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// If the severity of the log line is err then we write to stderr
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// otherwise all messages go to stdout
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if logParts.Severity == syslog.LOG_ERR {
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e.lre.Write(logParts.Message)
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e.lre.Write([]byte{'\n'})
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} else {
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e.lro.Write(logParts.Message)
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e.lro.Write([]byte{'\n'})
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}
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}
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}
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// configure new process group for child process
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func (e *UniversalExecutor) setNewProcessGroup() error {
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// We need to check that as build flags includes windows for this file
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if e.cmd.SysProcAttr == nil {
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e.cmd.SysProcAttr = &syscall.SysProcAttr{}
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}
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e.cmd.SysProcAttr.CreationFlags = syscall.CREATE_NEW_PROCESS_GROUP
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return nil
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}
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// Cleanup any still hanging user processes
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func (e *UniversalExecutor) cleanupChildProcesses(proc *os.Process) error {
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// We must first verify if the process is still running.
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// (Windows process often lingered around after being reported as killed).
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handle, err := syscall.OpenProcess(syscall.PROCESS_TERMINATE|syscall.SYNCHRONIZE|syscall.PROCESS_QUERY_INFORMATION, false, uint32(proc.Pid))
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if err != nil {
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return os.NewSyscallError("OpenProcess", err)
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}
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defer syscall.CloseHandle(handle)
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result, err := syscall.WaitForSingleObject(syscall.Handle(handle), 0)
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switch result {
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case syscall.WAIT_OBJECT_0:
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return nil
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case syscall.WAIT_TIMEOUT:
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// Process still running. Just kill it.
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return proc.Kill()
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default:
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return os.NewSyscallError("WaitForSingleObject", err)
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}
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}
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// Send a Ctrl-Break signal for shutting down the process,
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// like in https://golang.org/src/os/signal/signal_windows_test.go
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func sendCtrlBreak(pid int) error {
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dll, err := syscall.LoadDLL("kernel32.dll")
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if err != nil {
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return fmt.Errorf("Error loading kernel32.dll: %v", err)
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}
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proc, err := dll.FindProc("GenerateConsoleCtrlEvent")
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if err != nil {
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return fmt.Errorf("Cannot find procedure GenerateConsoleCtrlEvent: %v", err)
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}
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result, _, err := proc.Call(syscall.CTRL_BREAK_EVENT, uintptr(pid))
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if result == 0 {
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return fmt.Errorf("Error sending ctrl-break event: %v", err)
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}
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return nil
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}
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func (e *UniversalExecutor) shutdownProcess(proc *os.Process) error {
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if err := sendCtrlBreak(proc.Pid); err != nil {
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return fmt.Errorf("executor.shutdown error: %v", err)
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}
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e.logger.Printf("Sent Ctrl-Break to process %v", proc.Pid)
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return nil
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}
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