res_sorcery_realtime: Remove leading ^ requirement.

res_sorcery_realtime's search-by-regex callback performed a check to
ensure that the passed-in regex began with a caret (^). If it did not,
then no results would be returned.

This callback only started to become used when "like" support was added
to PJSIP CLI commands. The CLI command for listing objects would pass an
empty regex ("") to the sorcery backend if no "like" statement was
present. For most sorcery backends, this resulted in returning all
objects. However, for realtime, this resulted in returning no objects.

This commit seeks to fix the regression by removing the requirement from
res_sorcery_realtime for the passed-in-regex to begin with a caret.

ASTERISK-25689 #close
Reported by Marcelo Terres

Change-Id: I22b4dc5d7f3f11bb29ac2e42ef94682e9bab3b20

res/res_sorcery_realtime.c

@@ -218,16 +218,12 @@ static void sorcery_realtime_retrieve_multiple(const struct ast_sorcery *sorcery
 
 static void sorcery_realtime_retrieve_regex(const struct ast_sorcery *sorcery, void *data, const char *type, struct ao2_container *objects, const char *regex)
 {
-	char field[strlen(UUID_FIELD) + 6], value[strlen(regex) + 2];
+	char field[strlen(UUID_FIELD) + 6], value[strlen(regex) + 3];
 	RAII_VAR(struct ast_variable *, fields, NULL, ast_variables_destroy);
 
 	/* The realtime API provides no direct ability to do regex so for now we support a limited subset using pattern matching */
-	if (regex[0] != '^') {
-		return;
-	}
-
 	snprintf(field, sizeof(field), "%s LIKE", UUID_FIELD);
-	snprintf(value, sizeof(value), "%s%%", regex + 1);
+	snprintf(value, sizeof(value), "%%%s%%", regex);
 
 	if (!(fields = ast_variable_new(field, value, ""))) {
 		return;

tests/test_sorcery_realtime.c

@@ -67,17 +67,13 @@ static int realtime_is_object_matching(const char *object_id, const struct ast_v
 
 		/* If we are doing a pattern matching we need to remove the LIKE from the name */
 		if ((like = strstr(name, " LIKE"))) {
-			char *pattern, *field_value = ast_strdupa(field->value);
+			char *field_value = ast_strdupa(field->value);
 
 			*like = '\0';
 
 			value = ast_strdupa(ast_variable_retrieve(realtime_objects, object_id, name));
 
-			if (!(pattern = strchr(field_value, '%'))) {
-				return 0;
-			}
-
-			*pattern = '\0';
+			field_value = ast_strip_quoted(field_value, "%", "%");
 
 			if (strncmp(value, field_value, strlen(field_value))) {
 				return 0;
@@ -567,7 +563,7 @@ AST_TEST_DEFINE(object_retrieve_regex)
 		return AST_TEST_FAIL;
 	}
 
-	if (!(objects = ast_sorcery_retrieve_by_regex(sorcery, "test", "^blah-"))) {
+	if (!(objects = ast_sorcery_retrieve_by_regex(sorcery, "test", "blah-"))) {
 		ast_test_status_update(test, "Failed to retrieve a container of objects\n");
 		return AST_TEST_FAIL;
 	} else if (ao2_container_count(objects) != 2) {