Add an implementation of getpass for systems that lack one.

configure.ac

@@ -749,6 +749,8 @@ if test x"$rsync_cv_HAVE_SOCKETPAIR" = x"yes"; then
     AC_DEFINE(HAVE_SOCKETPAIR, 1, [Define to 1 if you have the "socketpair" function])
 fi
 
+AC_CHECK_FUNCS(getpass, , [AC_LIBOBJ(lib/getpass)])
+
 if test x"$with_included_popt" != x"yes"; then
     AC_CHECK_LIB(popt, poptGetContext, , [with_included_popt=yes])
 fi

lib/getpass.c

+/*
+ * 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;
+}

rsync.h

@@ -1282,6 +1282,10 @@ const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 int inet_pton(int af, const char *src, void *dst);
 #endif
 
+#ifndef HAVE_GETPASS
+char *getpass(const char *prompt);
+#endif
+
 #ifdef MAINTAINER_MODE
 const char *get_panic_action(void);
 #endif