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/*
*
* Copyright 2017 gRPC 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 <grpc++/impl/codegen/proto_utils.h>
#include <grpc++/impl/grpc_library.h>
#include <gtest/gtest.h>
namespace grpc {
namespace internal {
static GrpcLibraryInitializer g_gli_initializer;
// Provide access to GrpcBufferWriter internals.
class GrpcBufferWriterPeer {
public:
explicit GrpcBufferWriterPeer(internal::GrpcBufferWriter* writer)
: writer_(writer) {}
bool have_backup() const { return writer_->have_backup_; }
const grpc_slice& backup_slice() const { return writer_->backup_slice_; }
const grpc_slice& slice() const { return writer_->slice_; }
private:
GrpcBufferWriter* writer_;
};
class ProtoUtilsTest : public ::testing::Test {};
// Regression test for a memory corruption bug where a series of
// GrpcBufferWriter Next()/Backup() invocations could result in a dangling
// pointer returned by Next() due to the interaction between grpc_slice inlining
// and GRPC_SLICE_START_PTR.
TEST_F(ProtoUtilsTest, BackupNext) {
// Ensure the GrpcBufferWriter internals are initialized.
g_gli_initializer.summon();
grpc_byte_buffer* bp;
GrpcBufferWriter writer(&bp, 8192);
GrpcBufferWriterPeer peer(&writer);
void* data;
int size;
// Allocate a slice.
ASSERT_TRUE(writer.Next(&data, &size));
EXPECT_EQ(8192, size);
// Return a single byte. Before the fix that this test acts as a regression
// for, this would have resulted in an inlined backup slice.
writer.BackUp(1);
EXPECT_TRUE(!peer.have_backup());
// On the next allocation, the slice is non-inlined.
ASSERT_TRUE(writer.Next(&data, &size));
EXPECT_TRUE(peer.slice().refcount != NULL);
// Cleanup.
g_core_codegen_interface->grpc_byte_buffer_destroy(bp);
}
} // namespace internal
} // namespace grpc
int main(int argc, char** argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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