askpass.c revision 89a126810703c666309310d0f3189e9834d70b5b
/* Copyright (c) 2006-2007 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "askpass.h"
#include <stdio.h>
#include <termios.h>
#include <fcntl.h>
#include <unistd.h>
void askpass(const char *prompt, char *buf, size_t buf_size)
{
struct termios old_tio, tio;
bool restore_tio = FALSE;
ssize_t ret;
size_t pos;
char ch;
int fd;
if (!isatty(STDIN_FILENO))
i_fatal("stdin isn't a TTY");
fputs(prompt, stderr);
fflush(stderr);
fd = open("/dev/tty", O_RDONLY);
if (fd < 0)
i_fatal("open(/dev/tty) failed: %m");
/* turn off echo */
if (tcgetattr(fd, &old_tio) == 0) {
restore_tio = TRUE;
tio = old_tio;
tio.c_lflag &= ~(ECHO | ECHONL);
(void)tcsetattr(fd, TCSAFLUSH, &tio);
}
/* read the password */
pos = 0;
while ((ret = read(fd, &ch, 1)) > 0) {
if (pos >= buf_size-1)
break;
if (ch == '\n' || ch == '\r')
break;
buf[pos++] = ch;
}
buf[pos] = '\0';
if (restore_tio)
(void)tcsetattr(fd, TCSAFLUSH, &old_tio);
fputs("\n", stderr); fflush(stderr);
(void)close(fd);
}