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test_filter_macro_resolver.cpp
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test_filter_macro_resolver.cpp
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/*
Copyright (C) 2020 The Falco Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#include "filter_macro_resolver.h"
#include <catch.hpp>
using namespace std;
using namespace libsinsp::filter::ast;
static pos_info create_pos(uint32_t idx, uint32_t line, uint32_t col)
{
pos_info ret;
ret.idx = idx;
ret.line = line;
ret.col = col;
return ret;
}
static bool operator==(const pos_info& p1, const pos_info& p2)
{
return (p1.idx == p2.idx) &&
(p1.line == p2.line) &&
(p1.col == p2.col);
}
TEST_CASE("Should resolve macros on a filter AST", "[rule_loader]")
{
string macro_name = "test_macro";
pos_info macro_pos = create_pos(12, 85, 27);
SECTION("in the general case")
{
std::shared_ptr<expr> macro = std::move(
unary_check_expr::create("test.field", "", "exists"));
std::vector<std::unique_ptr<expr>> filter_and;
filter_and.push_back(unary_check_expr::create("evt.name", "", "exists"));
filter_and.push_back(not_expr::create(value_expr::create(macro_name, macro_pos)));
std::shared_ptr<expr> filter = std::move(and_expr::create(filter_and));
std::vector<std::unique_ptr<expr>> expected_and;
expected_and.push_back(unary_check_expr::create("evt.name", "", "exists"));
expected_and.push_back(not_expr::create(clone(macro.get())));
std::shared_ptr<expr> expected = std::move(and_expr::create(expected_and));
filter_macro_resolver resolver;
resolver.set_macro(macro_name, macro);
// first run
REQUIRE(resolver.run(filter) == true);
REQUIRE(resolver.get_resolved_macros().size() == 1);
REQUIRE(resolver.get_resolved_macros().begin()->first == macro_name);
REQUIRE(resolver.get_resolved_macros().begin()->second == macro_pos);
REQUIRE(resolver.get_unknown_macros().empty());
REQUIRE(filter->is_equal(expected.get()));
// second run
REQUIRE(resolver.run(filter) == false);
REQUIRE(resolver.get_resolved_macros().empty());
REQUIRE(resolver.get_unknown_macros().empty());
REQUIRE(filter->is_equal(expected.get()));
}
SECTION("with a single node")
{
std::shared_ptr<expr> macro = std::move(
unary_check_expr::create("test.field", "", "exists"));
std::shared_ptr<expr> filter = std::move(value_expr::create(macro_name, macro_pos));
filter_macro_resolver resolver;
resolver.set_macro(macro_name, macro);
// first run
expr* old_filter_ptr = filter.get();
REQUIRE(resolver.run(filter) == true);
REQUIRE(filter.get() != old_filter_ptr);
REQUIRE(resolver.get_resolved_macros().size() == 1);
REQUIRE(resolver.get_resolved_macros().begin()->first == macro_name);
REQUIRE(resolver.get_resolved_macros().begin()->second == macro_pos);
REQUIRE(resolver.get_unknown_macros().empty());
REQUIRE(filter->is_equal(macro.get()));
// second run
old_filter_ptr = filter.get();
REQUIRE(resolver.run(filter) == false);
REQUIRE(filter.get() == old_filter_ptr);
REQUIRE(resolver.get_resolved_macros().empty());
REQUIRE(resolver.get_unknown_macros().empty());
REQUIRE(filter->is_equal(macro.get()));
}
SECTION("with multiple macros")
{
string a_macro_name = macro_name + "_1";
string b_macro_name = macro_name + "_2";
pos_info a_macro_pos = create_pos(11, 75, 43);
pos_info b_macro_pos = create_pos(91, 21, 9);
std::shared_ptr<expr> a_macro = std::move(
unary_check_expr::create("one.field", "", "exists"));
std::shared_ptr<expr> b_macro = std::move(
unary_check_expr::create("another.field", "", "exists"));
std::vector<std::unique_ptr<expr>> filter_or;
filter_or.push_back(value_expr::create(a_macro_name, a_macro_pos));
filter_or.push_back(value_expr::create(b_macro_name, b_macro_pos));
std::shared_ptr<expr> filter = std::move(or_expr::create(filter_or));
std::vector<std::unique_ptr<expr>> expected_or;
expected_or.push_back(clone(a_macro.get()));
expected_or.push_back(clone(b_macro.get()));
std::shared_ptr<expr> expected_filter = std::move(or_expr::create(expected_or));
filter_macro_resolver resolver;
resolver.set_macro(a_macro_name, a_macro);
resolver.set_macro(b_macro_name, b_macro);
// first run
REQUIRE(resolver.run(filter) == true);
REQUIRE(resolver.get_resolved_macros().size() == 2);
auto a_resolved_itr = resolver.get_resolved_macros().find(a_macro_name);
REQUIRE(a_resolved_itr != resolver.get_resolved_macros().end());
REQUIRE(a_resolved_itr->first == a_macro_name);
REQUIRE(a_resolved_itr->second == a_macro_pos);
auto b_resolved_itr = resolver.get_resolved_macros().find(b_macro_name);
REQUIRE(b_resolved_itr != resolver.get_resolved_macros().end());
REQUIRE(resolver.get_unknown_macros().empty());
REQUIRE(b_resolved_itr->first == b_macro_name);
REQUIRE(b_resolved_itr->second == b_macro_pos);
REQUIRE(filter->is_equal(expected_filter.get()));
// second run
REQUIRE(resolver.run(filter) == false);
REQUIRE(resolver.get_resolved_macros().empty());
REQUIRE(resolver.get_unknown_macros().empty());
REQUIRE(filter->is_equal(expected_filter.get()));
}
SECTION("with nested macros")
{
string a_macro_name = macro_name + "_1";
string b_macro_name = macro_name + "_2";
pos_info a_macro_pos = create_pos(47, 1, 76);
pos_info b_macro_pos = create_pos(111, 65, 2);
std::vector<std::unique_ptr<expr>> a_macro_and;
a_macro_and.push_back(unary_check_expr::create("one.field", "", "exists"));
a_macro_and.push_back(value_expr::create(b_macro_name, b_macro_pos));
std::shared_ptr<expr> a_macro = std::move(and_expr::create(a_macro_and));
std::shared_ptr<expr> b_macro = std::move(
unary_check_expr::create("another.field", "", "exists"));
std::shared_ptr<expr> filter = std::move(value_expr::create(a_macro_name, a_macro_pos));
std::vector<std::unique_ptr<expr>> expected_and;
expected_and.push_back(unary_check_expr::create("one.field", "", "exists"));
expected_and.push_back(unary_check_expr::create("another.field", "", "exists"));
std::shared_ptr<expr> expected_filter = std::move(and_expr::create(expected_and));
filter_macro_resolver resolver;
resolver.set_macro(a_macro_name, a_macro);
resolver.set_macro(b_macro_name, b_macro);
// first run
REQUIRE(resolver.run(filter) == true);
REQUIRE(resolver.get_resolved_macros().size() == 2);
auto a_resolved_itr = resolver.get_resolved_macros().find(a_macro_name);
REQUIRE(a_resolved_itr != resolver.get_resolved_macros().end());
REQUIRE(a_resolved_itr->first == a_macro_name);
REQUIRE(a_resolved_itr->second == a_macro_pos);
auto b_resolved_itr = resolver.get_resolved_macros().find(b_macro_name);
REQUIRE(b_resolved_itr != resolver.get_resolved_macros().end());
REQUIRE(resolver.get_unknown_macros().empty());
REQUIRE(b_resolved_itr->first == b_macro_name);
REQUIRE(b_resolved_itr->second == b_macro_pos);
REQUIRE(resolver.get_unknown_macros().empty());
REQUIRE(filter->is_equal(expected_filter.get()));
// second run
REQUIRE(resolver.run(filter) == false);
REQUIRE(resolver.get_resolved_macros().empty());
REQUIRE(resolver.get_unknown_macros().empty());
REQUIRE(filter->is_equal(expected_filter.get()));
}
}
TEST_CASE("Should find unknown macros", "[rule_loader]")
{
string macro_name = "test_macro";
pos_info macro_pos = create_pos(9, 4, 2);
SECTION("in the general case")
{
std::vector<std::unique_ptr<expr>> filter_and;
filter_and.push_back(unary_check_expr::create("evt.name", "", "exists"));
filter_and.push_back(not_expr::create(value_expr::create(macro_name, macro_pos)));
std::shared_ptr<expr> filter = std::move(and_expr::create(filter_and));
filter_macro_resolver resolver;
REQUIRE(resolver.run(filter) == false);
REQUIRE(resolver.get_unknown_macros().size() == 1);
REQUIRE(resolver.get_unknown_macros().begin()->first == macro_name);
REQUIRE(resolver.get_unknown_macros().begin()->second == macro_pos);
REQUIRE(resolver.get_resolved_macros().empty());
}
SECTION("with nested macros")
{
string a_macro_name = macro_name + "_1";
string b_macro_name = macro_name + "_2";
pos_info a_macro_pos = create_pos(32, 84, 9);
pos_info b_macro_pos = create_pos(1, 0, 5);
std::vector<std::unique_ptr<expr>> a_macro_and;
a_macro_and.push_back(unary_check_expr::create("one.field", "", "exists"));
a_macro_and.push_back(value_expr::create(b_macro_name, b_macro_pos));
std::shared_ptr<expr> a_macro = std::move(and_expr::create(a_macro_and));
std::shared_ptr<expr> filter = std::move(value_expr::create(a_macro_name, a_macro_pos));
auto expected_filter = clone(a_macro.get());
filter_macro_resolver resolver;
resolver.set_macro(a_macro_name, a_macro);
// first run
REQUIRE(resolver.run(filter) == true);
REQUIRE(resolver.get_resolved_macros().size() == 1);
REQUIRE(resolver.get_resolved_macros().begin()->first == a_macro_name);
REQUIRE(resolver.get_resolved_macros().begin()->second == a_macro_pos);
REQUIRE(resolver.get_unknown_macros().size() == 1);
REQUIRE(resolver.get_unknown_macros().begin()->first == b_macro_name);
REQUIRE(resolver.get_unknown_macros().begin()->second == b_macro_pos);
REQUIRE(filter->is_equal(expected_filter.get()));
}
}
TEST_CASE("Should undefine macro", "[rule_loader]")
{
string macro_name = "test_macro";
pos_info macro_pos_1 = create_pos(12, 9, 3);
pos_info macro_pos_2 = create_pos(9, 6, 3);
std::shared_ptr<expr> macro = std::move(unary_check_expr::create("test.field", "", "exists"));
std::shared_ptr<expr> a_filter = std::move(value_expr::create(macro_name, macro_pos_1));
std::shared_ptr<expr> b_filter = std::move(value_expr::create(macro_name, macro_pos_2));
filter_macro_resolver resolver;
resolver.set_macro(macro_name, macro);
REQUIRE(resolver.run(a_filter) == true);
REQUIRE(resolver.get_resolved_macros().size() == 1);
REQUIRE(resolver.get_resolved_macros().begin()->first == macro_name);
REQUIRE(resolver.get_resolved_macros().begin()->second == macro_pos_1);
REQUIRE(resolver.get_unknown_macros().empty());
REQUIRE(a_filter->is_equal(macro.get()));
resolver.set_macro(macro_name, NULL);
REQUIRE(resolver.run(b_filter) == false);
REQUIRE(resolver.get_resolved_macros().empty());
REQUIRE(resolver.get_unknown_macros().size() == 1);
REQUIRE(resolver.get_unknown_macros().begin()->first == macro_name);
REQUIRE(resolver.get_unknown_macros().begin()->second == macro_pos_2);
}
// checks that the macro AST is cloned and not shared across resolved filters
TEST_CASE("Should clone macro AST", "[rule_loader]")
{
string macro_name = "test_macro";
pos_info macro_pos = create_pos(5, 2, 8888);
std::shared_ptr<unary_check_expr> macro = std::move(unary_check_expr::create("test.field", "", "exists"));
std::shared_ptr<expr> filter = std::move(value_expr::create(macro_name, macro_pos));
filter_macro_resolver resolver;
resolver.set_macro(macro_name, macro);
REQUIRE(resolver.run(filter) == true);
REQUIRE(resolver.get_resolved_macros().size() == 1);
REQUIRE(resolver.get_resolved_macros().begin()->first == macro_name);
REQUIRE(resolver.get_resolved_macros().begin()->second == macro_pos);
REQUIRE(resolver.get_unknown_macros().empty());
REQUIRE(filter->is_equal(macro.get()));
macro->field = "another.field";
REQUIRE(!filter->is_equal(macro.get()));
}