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|
package password
import (
"os"
"syscall"
"unsafe"
)
// This file is a mess based primarily on
// "github.com/howeyc/gopass"
// "golang.org/x/crypto/ssh/terminal"
// with extra unistd.h ripped from solaris on amd64
//
// TODO: get some of these changes merged into the above two packages
// ioctl constants -- not defined in solaris syscall pkg
const (
SYS_IOCTL = 54
TCGETS = 21517
TCSETS = 21518
ttyfd = 0 //STDIN
)
// getTermios reads the current termios settings into the
// given termios struct.
func getTermios(term *syscall.Termios) error {
_, _, errno := syscall.Syscall(SYS_IOCTL,
uintptr(ttyfd), uintptr(TCGETS),
uintptr(unsafe.Pointer(term)))
if errno != 0 {
return os.NewSyscallError("SYS_IOCTL", errno)
}
return nil
}
// setTermios applies the supplied termios settings
func setTermios(term *syscall.Termios) error {
_, _, errno := syscall.Syscall(SYS_IOCTL,
uintptr(ttyfd), uintptr(TCSETS),
uintptr(unsafe.Pointer(term)))
if errno != 0 {
return os.NewSyscallError("SYS_IOCTL", errno)
}
return nil
}
// setRaw puts the terminal into "raw" mode, which takes
// in all key presses and does not echo them.
func setRaw(term syscall.Termios) error {
termCopy := term
termCopy.Iflag &^= syscall.ISTRIP | syscall.INLCR |
syscall.ICRNL | syscall.IGNCR | syscall.IXON | syscall.IXOFF
termCopy.Lflag &^= syscall.ECHO | syscall.ICANON | syscall.ISIG
return setTermios(&termCopy)
}
// isTerminal checks if we are reading from a terminal (instead of a pipe).
func IsTerminal() bool {
var termios syscall.Termios
_, _, errno := syscall.Syscall(SYS_IOCTL,
uintptr(ttyfd), TCGETS,
uintptr(unsafe.Pointer(&termios)))
return errno == 0
}
// readChar safely gets one byte from stdin
func readChar() byte {
var originalTerm syscall.Termios
if err := getTermios(&originalTerm); err != nil {
panic(err) // should not happen on amd64 solaris (untested on sparc)
}
if err := setRaw(originalTerm); err != nil {
panic(err)
}
defer func() {
// make sure we return the termios back to normal
if err := setTermios(&originalTerm); err != nil {
panic(err)
}
}()
// read a single byte then reset the terminal state
var singleChar [1]byte
if n, err := syscall.Read(ttyfd, singleChar[:]); n == 0 || err != nil {
panic(err)
}
return singleChar[0]
}
// get password from terminal
func GetPass() string {
// keep reading in characters until we hit a stopping point
pass := []byte{}
for {
ch := readChar()
if ch == backspaceKey || ch == deleteKey {
if len(pass) > 0 {
pass = pass[:len(pass)-1]
}
} else if ch == carriageReturnKey || ch == newLineKey || ch == eotKey || ch == eofKey {
break
} else if ch != 0 {
pass = append(pass, ch)
}
}
return string(pass)
}
|
