mirror of
https://github.com/rclone/rclone.git
synced 2024-12-01 04:45:03 +01:00
120 lines
4.2 KiB
Go
120 lines
4.2 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// +build darwin dragonfly freebsd linux,!appengine netbsd openbsd
|
|
|
|
// Package terminal provides support functions for dealing with terminals, as
|
|
// commonly found on UNIX systems.
|
|
//
|
|
// Putting a terminal into raw mode is the most common requirement:
|
|
//
|
|
// oldState, err := terminal.MakeRaw(0)
|
|
// if err != nil {
|
|
// panic(err)
|
|
// }
|
|
// defer terminal.Restore(0, oldState)
|
|
package terminal // import "golang.org/x/crypto/ssh/terminal"
|
|
|
|
import (
|
|
"syscall"
|
|
"unsafe"
|
|
)
|
|
|
|
// State contains the state of a terminal.
|
|
type State struct {
|
|
termios syscall.Termios
|
|
}
|
|
|
|
// IsTerminal returns true if the given file descriptor is a terminal.
|
|
func IsTerminal(fd int) bool {
|
|
var termios syscall.Termios
|
|
_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlReadTermios, uintptr(unsafe.Pointer(&termios)), 0, 0, 0)
|
|
return err == 0
|
|
}
|
|
|
|
// MakeRaw put the terminal connected to the given file descriptor into raw
|
|
// mode and returns the previous state of the terminal so that it can be
|
|
// restored.
|
|
func MakeRaw(fd int) (*State, error) {
|
|
var oldState State
|
|
if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlReadTermios, uintptr(unsafe.Pointer(&oldState.termios)), 0, 0, 0); err != 0 {
|
|
return nil, err
|
|
}
|
|
|
|
newState := oldState.termios
|
|
// This attempts to replicate the behaviour documented for cfmakeraw in
|
|
// the termios(3) manpage.
|
|
newState.Iflag &^= syscall.IGNBRK | syscall.BRKINT | syscall.PARMRK | syscall.ISTRIP | syscall.INLCR | syscall.IGNCR | syscall.ICRNL | syscall.IXON
|
|
newState.Oflag &^= syscall.OPOST
|
|
newState.Lflag &^= syscall.ECHO | syscall.ECHONL | syscall.ICANON | syscall.ISIG | syscall.IEXTEN
|
|
newState.Cflag &^= syscall.CSIZE | syscall.PARENB
|
|
newState.Cflag |= syscall.CS8
|
|
if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlWriteTermios, uintptr(unsafe.Pointer(&newState)), 0, 0, 0); err != 0 {
|
|
return nil, err
|
|
}
|
|
|
|
return &oldState, nil
|
|
}
|
|
|
|
// GetState returns the current state of a terminal which may be useful to
|
|
// restore the terminal after a signal.
|
|
func GetState(fd int) (*State, error) {
|
|
var oldState State
|
|
if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlReadTermios, uintptr(unsafe.Pointer(&oldState.termios)), 0, 0, 0); err != 0 {
|
|
return nil, err
|
|
}
|
|
|
|
return &oldState, nil
|
|
}
|
|
|
|
// Restore restores the terminal connected to the given file descriptor to a
|
|
// previous state.
|
|
func Restore(fd int, state *State) error {
|
|
if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlWriteTermios, uintptr(unsafe.Pointer(&state.termios)), 0, 0, 0); err != 0 {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// GetSize returns the dimensions of the given terminal.
|
|
func GetSize(fd int) (width, height int, err error) {
|
|
var dimensions [4]uint16
|
|
|
|
if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(syscall.TIOCGWINSZ), uintptr(unsafe.Pointer(&dimensions)), 0, 0, 0); err != 0 {
|
|
return -1, -1, err
|
|
}
|
|
return int(dimensions[1]), int(dimensions[0]), nil
|
|
}
|
|
|
|
// passwordReader is an io.Reader that reads from a specific file descriptor.
|
|
type passwordReader int
|
|
|
|
func (r passwordReader) Read(buf []byte) (int, error) {
|
|
return syscall.Read(int(r), buf)
|
|
}
|
|
|
|
// ReadPassword reads a line of input from a terminal without local echo. This
|
|
// is commonly used for inputting passwords and other sensitive data. The slice
|
|
// returned does not include the \n.
|
|
func ReadPassword(fd int) ([]byte, error) {
|
|
var oldState syscall.Termios
|
|
if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlReadTermios, uintptr(unsafe.Pointer(&oldState)), 0, 0, 0); err != 0 {
|
|
return nil, err
|
|
}
|
|
|
|
newState := oldState
|
|
newState.Lflag &^= syscall.ECHO
|
|
newState.Lflag |= syscall.ICANON | syscall.ISIG
|
|
newState.Iflag |= syscall.ICRNL
|
|
if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlWriteTermios, uintptr(unsafe.Pointer(&newState)), 0, 0, 0); err != 0 {
|
|
return nil, err
|
|
}
|
|
|
|
defer func() {
|
|
syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), ioctlWriteTermios, uintptr(unsafe.Pointer(&oldState)), 0, 0, 0)
|
|
}()
|
|
|
|
return readPasswordLine(passwordReader(fd))
|
|
}
|