fix possible bad pointer in global vars (please test)

src/include/private/switch_core_pvt.h

@@ -246,6 +246,7 @@ struct switch_runtime {
 	int sql_buffer_len;
 	int max_sql_buffer_len;
 	switch_dbtype_t odbc_dbtype;
+	char hostname[256];
 };
 
 extern struct switch_runtime runtime;

src/include/switch_core.h

@@ -759,6 +759,9 @@ SWITCH_DECLARE(switch_core_session_t *) switch_core_session_force_locate(_In_z_
   \return the value of the desired variable
 */
 SWITCH_DECLARE(char *) switch_core_get_variable(_In_z_ const char *varname);
+SWITCH_DECLARE(char *) switch_core_get_variable_dup(_In_z_ const char *varname);
+SWITCH_DECLARE(char *) switch_core_get_variable_pdup(_In_z_ const char *varname, switch_memory_pool_t *pool);
+SWITCH_DECLARE(const char *) switch_core_get_hostname(void);
 
 /*! 
   \brief Add a global variable to the core

src/include/switch_nat.h

@@ -49,7 +49,7 @@ typedef enum {
 	SWITCH_NAT_TCP
 } switch_nat_ip_proto_t;
 
-
+SWITCH_DECLARE(const char *) switch_nat_get_type(void);
 
 /*! 
   \brief Initilize the NAT Traversal System