109 lines
3.3 KiB
C
109 lines
3.3 KiB
C
/*
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* FCRON - periodic command scheduler
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*
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* Copyright 2000-2014 Thibault Godouet <fcron@free.fr>
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* The GNU General Public License can also be found in the file
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* `LICENSE' that comes with the fcron source distribution.
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*/
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/* read a string (password, etc ...) securely from a tty */
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#include "global.h"
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#include "read_string.h"
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#include "log.h"
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#include "mem.h"
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extern char debug_opt;
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/* Derived from Andrew Morgan <morgan@linux.kernel.org> work in Linux PAM misc lib. */
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/* may be used in fcrondyn without pam : */
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#ifndef HAVE_LIBPAM
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#define PAM_MAX_MSG_SIZE LINE_LEN
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#endif
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char *
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read_string(int echo, const char *prompt)
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/* read a line of input string, giving prompt when appropriate */
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{
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struct termios term_before, term_tmp;
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char line[PAM_MAX_MSG_SIZE];
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int nc, have_term = 0;
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debug("called with echo='%s', prompt='%s'.", echo ? "ON" : "OFF", prompt);
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if (isatty(STDIN_FILENO)) { /* terminal state */
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/* is a terminal so record settings and flush it */
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if (tcgetattr(STDIN_FILENO, &term_before) != 0) {
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debug("error: failed to get terminal settings");
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return NULL;
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}
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memcpy(&term_tmp, &term_before, sizeof(term_tmp));
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if (!echo)
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term_tmp.c_lflag &= ~(ECHO);
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have_term = 1;
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}
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else if (!echo)
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debug("warning: cannot turn echo off");
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/* reading the line */
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while (1) {
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fprintf(stderr, "%s", prompt);
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/* this may, or may not set echo off -- drop pending input */
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if (have_term)
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(void)tcsetattr(STDIN_FILENO, TCSAFLUSH, &term_tmp);
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nc = read(STDIN_FILENO, line, sizeof(line) - 1);
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if (have_term) {
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(void)tcsetattr(STDIN_FILENO, TCSADRAIN, &term_before);
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if (!echo) /* do we need a newline? */
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fprintf(stderr, "\n");
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}
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if (nc > 0) { /* we got some user input */
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char *input;
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if (nc > 0 && line[nc - 1] == '\n') { /* <NUL> terminate */
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line[--nc] = '\0';
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}
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else {
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line[nc] = '\0';
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}
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input = strdup2(line);
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Overwrite(line);
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return input; /* return malloc()ed string */
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}
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else if (nc == 0) { /* Ctrl-D */
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debug("user did not want to type anything");
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fprintf(stderr, "\n");
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break;
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}
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}
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if (have_term)
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(void)tcsetattr(STDIN_FILENO, TCSADRAIN, &term_before);
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memset(line, 0, PAM_MAX_MSG_SIZE); /* clean up */
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return NULL;
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}
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