gistfile1.txt

package main

//#include <termios.h>
import "C"

import (
	"fmt"
	"os"
	"syscall"
)

func tcsetattr(fd uintptr, when int, termios *syscall.Termios) {
	var cterm C.struct_termios
	var cc_t [C.NCCS]C.cc_t
	for i, c := range termios.Cc {
		cc_t[i] = C.cc_t(c)
	}
	cterm.c_iflag = C.tcflag_t(termios.Iflag)
	cterm.c_oflag = C.tcflag_t(termios.Oflag)
	cterm.c_cflag = C.tcflag_t(termios.Cflag)
	cterm.c_lflag = C.tcflag_t(termios.Lflag)
	cterm.c_cc = cc_t
	cterm.c_ispeed = C.speed_t(termios.Ispeed)
	cterm.c_ospeed = C.speed_t(termios.Ospeed)
	C.tcsetattr(C.int(fd), C.int(when), &cterm)
}

func tcgetattr(fd uintptr, termios *syscall.Termios) {
	var cterm C.struct_termios
	C.tcgetattr(C.int(fd), &cterm)
	var cc [C.NCCS]uint8
	for i, c := range cterm.c_cc {
		cc[i] = uint8(c)
	}
	*termios = syscall.Termios{
		Iflag:  uint64(cterm.c_iflag),
		Oflag:  uint64(cterm.c_oflag),
		Cflag:  uint64(cterm.c_cflag),
		Lflag:  uint64(cterm.c_lflag),
		Cc:     cc,
		Ispeed: uint64(cterm.c_ispeed),
		Ospeed: uint64(cterm.c_ospeed),
	}
}

func main() {
	fd := os.Stdin.Fd()
	var termios syscall.Termios
	tcgetattr(fd, &termios)
	termios.Lflag &^= syscall.ECHO
	tcsetattr(fd, 0, &termios)
	fmt.Print("Password: ")
	var buf [16]byte
	var pass []byte
	for {
		n, _ := syscall.Read(int(fd), buf[:])
		if n == 0 {
			if len(pass) == 0 {
				panic("eof")
			}
			break
		}
		if buf[n-1] == '\n' {
			n--
		}
		pass = append(pass, buf[:n]...)
		if n < len(buf) {
			break
		}
	}
	fmt.Println(string(pass))
}