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| 1 | +// Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one |
| 2 | +// or more contributor license agreements. Licensed under the Elastic License; |
| 3 | +// you may not use this file except in compliance with the Elastic License. |
| 4 | + |
| 5 | +//go:build windows |
| 6 | + |
| 7 | +package install |
| 8 | + |
| 9 | +import ( |
| 10 | + "errors" |
| 11 | + "fmt" |
| 12 | + "io/fs" |
| 13 | + "syscall" |
| 14 | + "unsafe" |
| 15 | + |
| 16 | + "golang.org/x/sys/windows" |
| 17 | +) |
| 18 | + |
| 19 | +func isBlockingOnExe(err error) bool { |
| 20 | + if err == nil { |
| 21 | + return false |
| 22 | + } |
| 23 | + path, errno := getPathFromError(err) |
| 24 | + if path == "" { |
| 25 | + return false |
| 26 | + } |
| 27 | + return errno == syscall.ERROR_ACCESS_DENIED |
| 28 | +} |
| 29 | + |
| 30 | +func isRetryableError(err error) bool { |
| 31 | + if err == nil { |
| 32 | + return false |
| 33 | + } |
| 34 | + path, errno := getPathFromError(err) |
| 35 | + if path == "" { |
| 36 | + return false |
| 37 | + } |
| 38 | + return errno == syscall.ERROR_ACCESS_DENIED || errno == windows.ERROR_SHARING_VIOLATION |
| 39 | +} |
| 40 | + |
| 41 | +func removeBlockingExe(blockingErr error) error { |
| 42 | + path, _ := getPathFromError(blockingErr) |
| 43 | + if path == "" { |
| 44 | + return nil |
| 45 | + } |
| 46 | + |
| 47 | + // open handle for delete only |
| 48 | + h, err := openDeleteHandle(path) |
| 49 | + if err != nil { |
| 50 | + return fmt.Errorf("failed to open handle for %q: %w", path, err) |
| 51 | + } |
| 52 | + |
| 53 | + // rename handle |
| 54 | + err = renameHandle(h) |
| 55 | + _ = windows.CloseHandle(h) |
| 56 | + if err != nil { |
| 57 | + return fmt.Errorf("failed to rename handle for %q: %w", path, err) |
| 58 | + } |
| 59 | + |
| 60 | + // re-open handle |
| 61 | + h, err = openDeleteHandle(path) |
| 62 | + if err != nil { |
| 63 | + return fmt.Errorf("failed to open handle after rename for %q: %w", path, err) |
| 64 | + } |
| 65 | + |
| 66 | + // dispose of the handle |
| 67 | + err = disposeHandle(h) |
| 68 | + _ = windows.CloseHandle(h) |
| 69 | + if err != nil { |
| 70 | + return fmt.Errorf("failed to dispose handle for %q: %w", path, err) |
| 71 | + } |
| 72 | + return nil |
| 73 | +} |
| 74 | + |
| 75 | +func getPathFromError(blockingErr error) (string, syscall.Errno) { |
| 76 | + var perr *fs.PathError |
| 77 | + if errors.As(blockingErr, &perr) { |
| 78 | + var errno syscall.Errno |
| 79 | + if errors.As(perr.Err, &errno) { |
| 80 | + return perr.Path, errno |
| 81 | + } |
| 82 | + } |
| 83 | + return "", 0 |
| 84 | +} |
| 85 | + |
| 86 | +func openDeleteHandle(path string) (windows.Handle, error) { |
| 87 | + wPath, err := windows.UTF16PtrFromString(path) |
| 88 | + if err != nil { |
| 89 | + return 0, err |
| 90 | + } |
| 91 | + handle, err := windows.CreateFile( |
| 92 | + wPath, |
| 93 | + windows.DELETE, |
| 94 | + 0, |
| 95 | + nil, |
| 96 | + windows.OPEN_EXISTING, |
| 97 | + windows.FILE_ATTRIBUTE_NORMAL, |
| 98 | + 0, |
| 99 | + ) |
| 100 | + if err != nil { |
| 101 | + return 0, err |
| 102 | + } |
| 103 | + return handle, nil |
| 104 | +} |
| 105 | + |
| 106 | +func renameHandle(hHandle windows.Handle) error { |
| 107 | + wRename, err := windows.UTF16FromString(":agentrm") |
| 108 | + if err != nil { |
| 109 | + return err |
| 110 | + } |
| 111 | + |
| 112 | + var rename fileRenameInfo |
| 113 | + lpwStream := &wRename[0] |
| 114 | + rename.FileNameLength = uint32(unsafe.Sizeof(lpwStream)) |
| 115 | + |
| 116 | + _, _, _ = windows.NewLazyDLL("kernel32.dll").NewProc("RtlCopyMemory").Call( |
| 117 | + uintptr(unsafe.Pointer(&rename.FileName[0])), |
| 118 | + uintptr(unsafe.Pointer(lpwStream)), |
| 119 | + unsafe.Sizeof(lpwStream), |
| 120 | + ) |
| 121 | + |
| 122 | + err = windows.SetFileInformationByHandle( |
| 123 | + hHandle, |
| 124 | + windows.FileRenameInfo, |
| 125 | + (*byte)(unsafe.Pointer(&rename)), |
| 126 | + uint32(unsafe.Sizeof(rename)+unsafe.Sizeof(lpwStream)), |
| 127 | + ) |
| 128 | + if err != nil { |
| 129 | + return err |
| 130 | + } |
| 131 | + return nil |
| 132 | +} |
| 133 | + |
| 134 | +func disposeHandle(hHandle windows.Handle) error { |
| 135 | + var deleteFile fileDispositionInfo |
| 136 | + deleteFile.DeleteFile = true |
| 137 | + |
| 138 | + err := windows.SetFileInformationByHandle( |
| 139 | + hHandle, |
| 140 | + windows.FileDispositionInfo, |
| 141 | + (*byte)(unsafe.Pointer(&deleteFile)), |
| 142 | + uint32(unsafe.Sizeof(deleteFile)), |
| 143 | + ) |
| 144 | + if err != nil { |
| 145 | + return err |
| 146 | + } |
| 147 | + return nil |
| 148 | +} |
| 149 | + |
| 150 | +type fileRenameInfo struct { |
| 151 | + Union struct { |
| 152 | + ReplaceIfExists bool |
| 153 | + Flags uint32 |
| 154 | + } |
| 155 | + RootDirectory windows.Handle |
| 156 | + FileNameLength uint32 |
| 157 | + FileName [1]uint16 |
| 158 | +} |
| 159 | + |
| 160 | +type fileDispositionInfo struct { |
| 161 | + DeleteFile bool |
| 162 | +} |
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