add api-expansion to switch.conf.xml and fsctl api_expansion command to control allowing apis to be expanded via variable expansion

src/include/switch_core.h

@@ -323,6 +323,9 @@ SWITCH_DECLARE(switch_status_t) switch_core_port_allocator_free_port(_In_ switch
 SWITCH_DECLARE(void) switch_core_port_allocator_destroy(_Inout_ switch_core_port_allocator_t **alloc);
 ///\}
 
+
+SWITCH_DECLARE(int) switch_core_test_flag(int flag);
+
 ///\defgroup ss Startup/Shutdown
 ///\ingroup core1
 ///\{

src/include/switch_types.h

@@ -322,7 +322,8 @@ typedef enum {
 	SCF_THREADED_SYSTEM_EXEC = (1 << 18),
 	SCF_SYNC_CLOCK_REQUESTED = (1 << 19),
 	SCF_CORE_ODBC_REQ = (1 << 20),
-	SCF_DEBUG_SQL = (1 << 21)
+	SCF_DEBUG_SQL = (1 << 21),
+	SCF_API_EXPANSION = (1 << 22)
 } switch_core_flag_enum_t;
 typedef uint32_t switch_core_flag_t;
 
@@ -1776,6 +1777,7 @@ typedef enum {
 	SCSC_SYNC_CLOCK_WHEN_IDLE,
 	SCSC_DEBUG_SQL,
 	SCSC_SQL,
+	SCSC_API_EXPANSION
 } switch_session_ctl_t;
 
 typedef enum {

src/mod/applications/mod_commands/mod_commands.c

@@ -1854,6 +1854,15 @@ SWITCH_STANDARD_API(ctl_function)
 			switch_core_session_ctl(SCSC_VERBOSE_EVENTS, &arg);
 
 			stream->write_function(stream, "+OK verbose_events is %s \n", arg ? "on" : "off");
+		} else if (!strcasecmp(argv[0], "api_expansion")) {
+			arg = -1;
+			if (argv[1]) {
+				arg = switch_true(argv[1]);
+			}
+
+			switch_core_session_ctl(SCSC_API_EXPANSION, &arg);
+
+			stream->write_function(stream, "+OK api_expansion is %s \n", arg ? "on" : "off");
 		} else if (!strcasecmp(argv[0], "threaded_system_exec")) {
 			arg = -1;
 			if (argv[1]) {

src/switch_channel.c

@@ -34,6 +34,7 @@
 #include <switch.h>
 #include <switch_channel.h>
 
+
 struct switch_cause_table {
 	const char *name;
 	switch_call_cause_t cause;
@@ -3591,7 +3592,7 @@ SWITCH_DECLARE(char *) switch_channel_expand_variables_check(switch_channel_t *c
 
 					if ((sub_val = (char *) switch_channel_get_variable_dup(channel, vname, SWITCH_TRUE, idx))) {
 						if (var_list && !switch_event_check_permission_list(var_list, vname)) {
-							sub_val = "INVALID";
+							sub_val = "<Variable Expansion Permission Denied>";
 						}
 
 						if ((expanded_sub_val = switch_channel_expand_variables_check(channel, sub_val, var_list, api_list, recur+1)) == sub_val) {
@@ -3645,9 +3646,9 @@ SWITCH_DECLARE(char *) switch_channel_expand_variables_check(switch_channel_t *c
 							vval = expanded;
 						}
 
-						if (api_list && !switch_event_check_permission_list(api_list, vname)) {
+						if (!switch_core_test_flag(SCF_API_EXPANSION) || (api_list && !switch_event_check_permission_list(api_list, vname))) {
-							func_val = "INVALID";
+							func_val = NULL;
-							sub_val = "INVALID";
+							sub_val = "<API Execute Permission Denied>";
 						} else {
 							if (switch_api_execute(vname, vval, channel->session, &stream) == SWITCH_STATUS_SUCCESS) {
 								func_val = stream.data;

src/switch_core.c

@@ -1405,6 +1405,12 @@ static void switch_core_set_serial(void)
 }
 
 
+SWITCH_DECLARE(int) switch_core_test_flag(int flag)
+{
+	return switch_test_flag((&runtime), flag);
+}
+
+
 SWITCH_DECLARE(switch_status_t) switch_core_init(switch_core_flag_t flags, switch_bool_t console, const char **err)
 {
 	switch_uuid_t uuid;
@@ -1433,6 +1439,7 @@ SWITCH_DECLARE(switch_status_t) switch_core_init(switch_core_flag_t flags, switc
 	switch_set_flag((&runtime.dummy_cng_frame), SFF_CNG);
 	switch_set_flag((&runtime), SCF_AUTO_SCHEMAS);
 	switch_set_flag((&runtime), SCF_CLEAR_SQL);
+	switch_set_flag((&runtime), SCF_API_EXPANSION);
 #ifdef WIN32
 	switch_set_flag((&runtime), SCF_THREADED_SYSTEM_EXEC);
 #endif
@@ -1750,6 +1757,12 @@ static void switch_load_core_config(const char *file)
 					} else {
 						switch_clear_flag((&runtime), SCF_CLEAR_SQL);
 					}
+				} else if (!strcasecmp(var, "api-expansion")) {
+					if (switch_true(val)) {
+						switch_set_flag((&runtime), SCF_API_EXPANSION);
+					} else {
+						switch_clear_flag((&runtime), SCF_API_EXPANSION);
+					}
 				} else if (!strcasecmp(var, "enable-early-hangup") && switch_true(val)) {
 					switch_set_flag((&runtime), SCF_EARLY_HANGUP);
 				} else if (!strcasecmp(var, "colorize-console") && switch_true(val)) {
@@ -2099,6 +2112,18 @@ SWITCH_DECLARE(int32_t) switch_core_session_ctl(switch_session_ctl_t cmd, void *
 			newintval = switch_test_flag((&runtime), SCF_VERBOSE_EVENTS);
 		}
 		break;
+	case SCSC_API_EXPANSION:
+		if (intval) {
+			if (oldintval > -1) {
+				if (oldintval) {
+					switch_set_flag((&runtime), SCF_API_EXPANSION);
+				} else {
+					switch_clear_flag((&runtime), SCF_API_EXPANSION);
+				}
+			}
+			newintval = switch_test_flag((&runtime), SCF_API_EXPANSION);
+		}
+		break;
 	case SCSC_THREADED_SYSTEM_EXEC:
 		if (intval) {
 			if (oldintval > -1) {

src/switch_event.c

@@ -35,6 +35,7 @@
 #include <switch.h>
 #include <switch_event.h>
 
+
 //#define SWITCH_EVENT_RECYCLE
 #define DISPATCH_QUEUE_LEN 100
 //#define DEBUG_DISPATCH_QUEUES
@@ -2109,7 +2110,7 @@ SWITCH_DECLARE(char *) switch_event_expand_headers_check(switch_event_t *event,
 						}
 
 						if (var_list && !switch_event_check_permission_list(var_list, vname)) {
-							sub_val = "INVALID";
+							sub_val = "<Variable Expansion Permission Denied>";
 						}
 
 
@@ -2161,9 +2162,9 @@ SWITCH_DECLARE(char *) switch_event_expand_headers_check(switch_event_t *event,
 							vval = expanded;
 						}
 
-						if (api_list && !switch_event_check_permission_list(api_list, vname)) {
+						if (!switch_core_test_flag(SCF_API_EXPANSION) || (api_list && !switch_event_check_permission_list(api_list, vname))) {
-							func_val = "INVALID";
+							func_val = NULL;
-							sub_val = "INVALID";
+							sub_val = "<API execute Permission Denied>";
 						} else {
 							if (switch_api_execute(vname, vval, NULL, &stream) == SWITCH_STATUS_SUCCESS) {
 								func_val = stream.data;