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0db662eae5
* fish/config.c: Include string.h, for use of strlen. * fish/keys.c: Likewise, but for use of memcpy. * fish/man.c: Likewise, but for use of memset.
93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
/* libguestfs - guestfish and guestmount shared option parsing
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* Copyright (C) 2010-2011 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <termios.h>
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#include <string.h>
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#include "guestfs.h"
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#include "options.h"
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/* Read a passphrase ('Key') from /dev/tty with echo off.
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* The caller (cmds.c) will call free on the string afterwards.
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* Based on the code in cryptsetup file lib/utils.c.
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*/
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char *
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read_key (const char *param)
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{
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FILE *infp, *outfp;
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struct termios orig, temp;
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char *ret = NULL;
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/* Read and write to /dev/tty if available. */
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if (keys_from_stdin ||
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(infp = outfp = fopen ("/dev/tty", "w+")) == NULL) {
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infp = stdin;
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outfp = stdout;
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}
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/* Print the prompt and set no echo. */
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int tty = isatty (fileno (infp));
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int tcset = 0;
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if (tty) {
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fprintf (outfp, _("Enter key or passphrase (\"%s\"): "), param);
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if (!echo_keys) {
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if (tcgetattr (fileno (infp), &orig) == -1) {
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perror ("tcgetattr");
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goto error;
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}
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memcpy (&temp, &orig, sizeof temp);
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temp.c_lflag &= ~ECHO;
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tcsetattr (fileno (infp), TCSAFLUSH, &temp);
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tcset = 1;
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}
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}
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size_t n = 0;
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ssize_t len;
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len = getline (&ret, &n, infp);
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if (len == -1) {
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perror ("getline");
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ret = NULL;
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goto error;
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}
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/* Remove the terminating \n if there is one. */
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if (len > 0 && ret[len-1] == '\n')
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ret[len-1] = '\0';
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error:
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/* Restore echo, close file descriptor. */
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if (tty && tcset) {
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printf ("\n");
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tcsetattr (fileno (infp), TCSAFLUSH, &orig);
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}
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if (infp != stdin)
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fclose (infp); /* outfp == infp, so this is closed also */
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return ret;
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}
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