simplify return value - always a string

This approach adds some level of protection (compiler type checking) from
misusing the API.

Author: lavarou

agent/csec_metadata.c

@@ -14,7 +14,7 @@
 #include "php_compat.h"
 #include "php_newrelic.h"
 
-int nr_php_csec_get_metadata(const nr_php_csec_metadata_key_t key, void** p) {
+int nr_php_csec_get_metadata(const nr_php_csec_metadata_key_t key, char** p) {
   const char* value = NULL;
 
   if (NULL == p) {
@@ -27,12 +27,12 @@ int nr_php_csec_get_metadata(const nr_php_csec_metadata_key_t key, void** p) {
 
   switch (key) {
     case NR_PHP_CSEC_METADATA_HIGH_SECURITY:
-      *p = nr_zalloc(sizeof(int));
-      if (NULL == *p) {
-        return -3;
+      if (NRPRG(app)->info.high_security) {
+        value = "true";
+      } else {
+        value = "false";
       }
-      *((int*)*p) = NRPRG(app)->info.high_security;
-      return 0;
+      break;
     case NR_PHP_CSEC_METADATA_ENTITY_NAME:
       value = nr_app_get_entity_name(NRPRG(app));
       break;

agent/csec_metadata.h

@@ -21,7 +21,8 @@ typedef enum {
 /*
  * Purpose : Copy requested app meta data into allocated *value.
  *           The caller is responsible for freeing the memory
- *           allocated.
+ *           allocated. The value is a string representation of
+ *           the requested metadata.
  *
  * Params  : Pointer to a nr_php_csec_metadata_t structure
  *
@@ -32,7 +33,7 @@ typedef enum {
  *          -4 for invalid metadata key
  *          -5 for inability to retrieve metadata value
  */
-extern int nr_php_csec_get_metadata(const nr_php_csec_metadata_key_t k, void** value);
-typedef int (*nr_php_csec_get_metadata_t)(const nr_php_csec_metadata_key_t k, void** value);
+extern int nr_php_csec_get_metadata(const nr_php_csec_metadata_key_t k, char** value);
+typedef int (*nr_php_csec_get_metadata_t)(const nr_php_csec_metadata_key_t k, char** value);
 #define NR_PHP_CSEC_GET_METADATA "nr_php_csec_get_metadata"
 #endif