Failing no-op implementations for several UI functions (#2772)

Author: justsmth

crypto/CMakeLists.txt

@@ -576,6 +576,7 @@ add_library(
   x509/x509name.c
   x509/x509rset.c
   x509/x509spki.c
+  ui/ui.c
   decrepit/bio/base64_bio.c
   decrepit/blowfish/blowfish.c
   decrepit/cast/cast.c

crypto/ui/ui.c

@@ -0,0 +1,35 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0 OR ISC
+
+// AWS-LC does not support the UI APIs. These functions always fail at runtime.
+// This file provides no-op implementations of several UI functions that return
+// failure when called. This allows compilation to succeed for projects that use
+// these functions for non-essential operations.
+
+#include "openssl/ui.h"
+#include "openssl/mem.h"
+
+UI *UI_new(void) {
+  return NULL;
+}
+
+void UI_free(UI *ui) {
+  OPENSSL_free(ui);
+}
+
+int UI_add_input_string(UI *ui, const char *prompt, int flags,
+        char *result_buf, int minsize, int maxsize) {
+  return 0;
+}
+int UI_add_verify_string(UI *ui, const char *prompt, int flags,
+        char *result_buf, int minsize, int maxsize, const char *test_buf) {
+  return 0;
+}
+
+int UI_add_info_string(UI *ui, const char *text) {
+  return 0;
+}
+
+int UI_process(UI *ui) {
+  return 0;
+}

include/openssl/ui.h

@@ -4,8 +4,36 @@
 #ifndef UI_H
 #define UI_H
 
-#endif //UI_H
+#include "openssl/base.h"
+struct ui_st {
+  char _unused;
+};
+
+struct ui_method_st {
+  char _unused;
+};
+
+typedef struct ui_st UI;
+typedef struct ui_method_st UI_METHOD;
+
+/// UI_new does nothing, always returns NULL.
+OPENSSL_EXPORT OPENSSL_DEPRECATED UI *UI_new(void);
+
+/// UI_free invokes OPENSSL_free on its parameter.
+OPENSSL_EXPORT OPENSSL_DEPRECATED void UI_free(UI *ui);
 
-// Intentionally empty.
+/// UI_add_input_string does nothing, always returns 0.
+OPENSSL_EXPORT OPENSSL_DEPRECATED int UI_add_input_string(UI *ui, const char *prompt, int flags,
+        char *result_buf, int minsize, int maxsize);
 
-// Prevent compiler fall-through picking up "openssl/ui.h" from the system path.
+/// UI_add_verify_string does nothing, always returns 0.
+OPENSSL_EXPORT OPENSSL_DEPRECATED int UI_add_verify_string(UI *ui, const char *prompt, int flags,
+        char *result_buf, int minsize, int maxsize, const char *test_buf);
+
+/// UI_add_info_string does nothing, always returns 0.
+OPENSSL_EXPORT OPENSSL_DEPRECATED int UI_add_info_string(UI *ui, const char *text);
+
+/// UI_process does nothing, always returns 0.
+OPENSSL_EXPORT OPENSSL_DEPRECATED int UI_process(UI *ui);
+
+#endif //UI_H