add readpassphrase for read passphrase

readpass.c

@@ -126,12 +126,10 @@ read_passphrase(const char *prompt, int flags)
 	char *askpass = NULL, *ret, buf[1024];
 	int rppflags, use_askpass = 0, ttyfd;
 
+	if (!NxAuthOnlyModeEnabled && !NxModeEnabled && !NXStdinPassEnabled) {
 		rppflags = (flags & RP_ECHO) ? RPP_ECHO_ON : RPP_ECHO_OFF;
-	if (flags & RP_USE_ASKPASS)
-		use_askpass = 1;
-	else if (flags & RP_ALLOW_STDIN) {
+		if (flags & RP_ALLOW_STDIN) {
 			if (!isatty(STDIN_FILENO)) {
-			debug("read_passphrase: stdin is not a tty");
 				use_askpass = 1;
 			}
 		} else {
@@ -154,17 +152,37 @@ read_passphrase(const char *prompt, int flags)
 				askpass = getenv(SSH_ASKPASS_ENV);
 			else
 				askpass = _PATH_SSH_ASKPASS_DEFAULT;
-		if ((ret = ssh_askpass(askpass, prompt)) == NULL)
-			if (!(flags & RP_ALLOW_EOF))
-				return xstrdup("");
-		return ret;
+			return ssh_askpass(askpass, prompt);
 		}
 
+
 		if (readpassphrase(prompt, buf, sizeof buf, rppflags) == NULL) {
 			if (flags & RP_ALLOW_EOF)
 				return NULL;
 			return xstrdup("");
 		}
+	} else {
+		size_t len;
+		int  retr;
+		fprintf(stdout, "%s", prompt);
+		fflush(stdout);
+
+		len = retr = 0;
+		do {
+			retr = read(STDIN_FILENO, buf + len, sizeof(buf) - 1 - len);
+			if (retr == -1 && errno == EINTR)
+				continue;
+			if (retr <= 0)
+				break;
+			len += retr;
+		} while (sizeof(buf) - 1 - len > 0 && buf[len] == '\n');
+
+		buf[len-1] = '\0';
+
+		fprintf(stdout, "\n");
+		fflush(stdout);
+	}
+
 
 	ret = xstrdup(buf);
 	explicit_bzero(buf, sizeof(buf));