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Merge pull request #4153 from ninoles/b-2117-windows-group-process
B 2117 windows group process
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| // +build windows | ||
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| package executor | ||
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| import ( | ||
| "fmt" | ||
| "io" | ||
| "os" | ||
| "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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| func (e *UniversalExecutor) LaunchSyslogServer() (*SyslogServerState, error) { | ||
| // Ensure the context has been set first | ||
| if e.ctx == nil { | ||
| return nil, fmt.Errorf("SetContext must be called before launching the Syslog Server") | ||
| } | ||
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| e.syslogChan = make(chan *logging.SyslogMessage, 2048) | ||
| l, err := e.getListener(e.ctx.PortLowerBound, e.ctx.PortUpperBound) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| e.logger.Printf("[DEBUG] syslog-server: launching syslog server on addr: %v", l.Addr().String()) | ||
| if err := e.configureLoggers(); err != nil { | ||
| return nil, err | ||
| } | ||
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| e.syslogServer = logging.NewSyslogServer(l, e.syslogChan, e.logger) | ||
| go e.syslogServer.Start() | ||
| go e.collectLogs(e.lre, e.lro) | ||
| syslogAddr := fmt.Sprintf("%s://%s", l.Addr().Network(), l.Addr().String()) | ||
| return &SyslogServerState{Addr: syslogAddr}, nil | ||
| } | ||
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| func (e *UniversalExecutor) collectLogs(we io.Writer, wo io.Writer) { | ||
| for logParts := range e.syslogChan { | ||
| // If the severity of the log line is err then we write to stderr | ||
| // otherwise all messages go to stdout | ||
| if logParts.Severity == syslog.LOG_ERR { | ||
| e.lre.Write(logParts.Message) | ||
| e.lre.Write([]byte{'\n'}) | ||
| } else { | ||
| e.lro.Write(logParts.Message) | ||
| e.lro.Write([]byte{'\n'}) | ||
| } | ||
| } | ||
| } | ||
|
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| // configure new process group for child process | ||
| func (e *UniversalExecutor) setNewProcessGroup() error { | ||
| // We need to check that as build flags includes windows for this file | ||
| if e.cmd.SysProcAttr == nil { | ||
| e.cmd.SysProcAttr = &syscall.SysProcAttr{} | ||
| } | ||
| e.cmd.SysProcAttr.CreationFlags = syscall.CREATE_NEW_PROCESS_GROUP | ||
| return nil | ||
| } | ||
|
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| // Cleanup any still hanging user processes | ||
| func (e *UniversalExecutor) cleanupChildProcesses(proc *os.Process) error { | ||
| // We must first verify if the process is still running. | ||
| // (Windows process often lingered around after being reported as killed). | ||
| handle, err := syscall.OpenProcess(syscall.PROCESS_TERMINATE|syscall.SYNCHRONIZE|syscall.PROCESS_QUERY_INFORMATION, false, uint32(proc.Pid)) | ||
| if err != nil { | ||
| return os.NewSyscallError("OpenProcess", err) | ||
| } | ||
| defer syscall.CloseHandle(handle) | ||
|
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| result, err := syscall.WaitForSingleObject(syscall.Handle(handle), 0) | ||
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| switch result { | ||
| case syscall.WAIT_OBJECT_0: | ||
| return nil | ||
| case syscall.WAIT_TIMEOUT: | ||
| // Process still running. Just kill it. | ||
| return proc.Kill() | ||
| default: | ||
| return os.NewSyscallError("WaitForSingleObject", err) | ||
| } | ||
| } | ||
|
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| // Send a Ctrl-Break signal for shutting down the process, | ||
| // like in https://golang.org/src/os/signal/signal_windows_test.go | ||
| func sendCtrlBreak(pid int) error { | ||
| dll, err := syscall.LoadDLL("kernel32.dll") | ||
| if err != nil { | ||
| return fmt.Errorf("Error loading kernel32.dll: %v", err) | ||
| } | ||
| proc, err := dll.FindProc("GenerateConsoleCtrlEvent") | ||
| if err != nil { | ||
| return fmt.Errorf("Cannot find procedure GenerateConsoleCtrlEvent: %v", err) | ||
| } | ||
| result, _, err := proc.Call(syscall.CTRL_BREAK_EVENT, uintptr(pid)) | ||
| if result == 0 { | ||
| return fmt.Errorf("Error sending ctrl-break event: %v", err) | ||
| } | ||
| return nil | ||
| } | ||
|
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| func (e *UniversalExecutor) shutdownProcess(proc *os.Process) error { | ||
| if err := sendCtrlBreak(proc.Pid); err != nil { | ||
| return fmt.Errorf("executor.shutdown error: %v", err) | ||
| } | ||
| e.logger.Printf("Sent Ctrl-Break to process %v", proc.Pid) | ||
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| return nil | ||
| } |