1// Copyright 2019 The Go Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style 3// license that can be found in the LICENSE file. 4 5// +build aix darwin dragonfly freebsd linux netbsd openbsd zos 6 7package term 8 9import ( 10 "golang.org/x/sys/unix" 11) 12 13type state struct { 14 termios unix.Termios 15} 16 17func isTerminal(fd int) bool { 18 _, err := unix.IoctlGetTermios(fd, ioctlReadTermios) 19 return err == nil 20} 21 22func makeRaw(fd int) (*State, error) { 23 termios, err := unix.IoctlGetTermios(fd, ioctlReadTermios) 24 if err != nil { 25 return nil, err 26 } 27 28 oldState := State{state{termios: *termios}} 29 30 // This attempts to replicate the behaviour documented for cfmakeraw in 31 // the termios(3) manpage. 32 termios.Iflag &^= unix.IGNBRK | unix.BRKINT | unix.PARMRK | unix.ISTRIP | unix.INLCR | unix.IGNCR | unix.ICRNL | unix.IXON 33 termios.Oflag &^= unix.OPOST 34 termios.Lflag &^= unix.ECHO | unix.ECHONL | unix.ICANON | unix.ISIG | unix.IEXTEN 35 termios.Cflag &^= unix.CSIZE | unix.PARENB 36 termios.Cflag |= unix.CS8 37 termios.Cc[unix.VMIN] = 1 38 termios.Cc[unix.VTIME] = 0 39 if err := unix.IoctlSetTermios(fd, ioctlWriteTermios, termios); err != nil { 40 return nil, err 41 } 42 43 return &oldState, nil 44} 45 46func getState(fd int) (*State, error) { 47 termios, err := unix.IoctlGetTermios(fd, ioctlReadTermios) 48 if err != nil { 49 return nil, err 50 } 51 52 return &State{state{termios: *termios}}, nil 53} 54 55func restore(fd int, state *State) error { 56 return unix.IoctlSetTermios(fd, ioctlWriteTermios, &state.termios) 57} 58 59func getSize(fd int) (width, height int, err error) { 60 ws, err := unix.IoctlGetWinsize(fd, unix.TIOCGWINSZ) 61 if err != nil { 62 return -1, -1, err 63 } 64 return int(ws.Col), int(ws.Row), nil 65} 66 67// passwordReader is an io.Reader that reads from a specific file descriptor. 68type passwordReader int 69 70func (r passwordReader) Read(buf []byte) (int, error) { 71 return unix.Read(int(r), buf) 72} 73 74func readPassword(fd int) ([]byte, error) { 75 termios, err := unix.IoctlGetTermios(fd, ioctlReadTermios) 76 if err != nil { 77 return nil, err 78 } 79 80 newState := *termios 81 newState.Lflag &^= unix.ECHO 82 newState.Lflag |= unix.ICANON | unix.ISIG 83 newState.Iflag |= unix.ICRNL 84 if err := unix.IoctlSetTermios(fd, ioctlWriteTermios, &newState); err != nil { 85 return nil, err 86 } 87 88 defer unix.IoctlSetTermios(fd, ioctlWriteTermios, termios) 89 90 return readPasswordLine(passwordReader(fd)) 91} 92