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/* libguestfs - guestfish and guestmount shared option parsing
* Copyright (C) 2010-2011 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <termios.h>
#include <string.h>
#include "guestfs.h"
#include "options.h"
/* Read a passphrase ('Key') from /dev/tty with echo off.
* The caller (cmds.c) will call free on the string afterwards.
* Based on the code in cryptsetup file lib/utils.c.
*/
char *
read_key (const char *param)
{
FILE *infp, *outfp;
struct termios orig, temp;
char *ret = NULL;
/* Read and write to /dev/tty if available. */
if (keys_from_stdin ||
(infp = outfp = fopen ("/dev/tty", "w+")) == NULL) {
infp = stdin;
outfp = stdout;
}
/* Print the prompt and set no echo. */
int tty = isatty (fileno (infp));
int tcset = 0;
if (tty) {
fprintf (outfp, _("Enter key or passphrase (\"%s\"): "), param);
if (!echo_keys) {
if (tcgetattr (fileno (infp), &orig) == -1) {
perror ("tcgetattr");
goto error;
}
memcpy (&temp, &orig, sizeof temp);
temp.c_lflag &= ~ECHO;
tcsetattr (fileno (infp), TCSAFLUSH, &temp);
tcset = 1;
}
}
size_t n = 0;
ssize_t len;
len = getline (&ret, &n, infp);
if (len == -1) {
perror ("getline");
ret = NULL;
goto error;
}
/* Remove the terminating \n if there is one. */
if (len > 0 && ret[len-1] == '\n')
ret[len-1] = '\0';
error:
/* Restore echo, close file descriptor. */
if (tty && tcset) {
printf ("\n");
tcsetattr (fileno (infp), TCSAFLUSH, &orig);
}
if (infp != stdin)
fclose (infp); /* outfp == infp, so this is closed also */
return ret;
}
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