/* * An implementation of getpass for systems that lack one. * * Copyright (C) 2013 Roman Donchenko * * 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 3 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, visit the http://fsf.org website. */ #include <stdio.h>#include <string.h>#include <termios.h> #include "rsync.h" char *getpass(const char *prompt){	static char password[256]; 	BOOL tty_changed = False, read_success;	struct termios tty_old, tty_new;	FILE *in = stdin, *out = stderr;	FILE *tty = fopen("/dev/tty", "w+"); 	if (tty)		in = out = tty; 	if (tcgetattr(fileno(in), &tty_old) == 0) {		tty_new = tty_old;		tty_new.c_lflag &= ~(ECHO | ISIG); 		if (tcsetattr(fileno(in), TCSAFLUSH, &tty_new) == 0)			tty_changed = True;	} 	if (!tty_changed)		fputs("(WARNING: will be visible) ", out);	fputs(prompt, out);	fflush(out); 	read_success = fgets(password, sizeof password, in) != NULL; 	/* Print the newline that hasn't been echoed. */	fputc('\n', out); 	if (tty_changed)		tcsetattr(fileno(in), TCSAFLUSH, &tty_old); 	if (tty)		fclose(tty); 	if (read_success) {		/* Remove the trailing newline. */		size_t password_len = strlen(password);		if (password_len && password[password_len - 1] == '\n')			password[password_len - 1] = '\0'; 		return password;	} 	return NULL;}