sandboxed-api/sandboxed_api/var_proto.h

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// Copyright 2019 Google LLC. All Rights Reserved.
//
// 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.
// Provides a class to marshall protobufs in and out of the sandbox
#ifndef SANDBOXED_API_VAR_PROTO_H_
#define SANDBOXED_API_VAR_PROTO_H_
#include <cinttypes>
#include "sandboxed_api/proto_helper.h"
#include "sandboxed_api/var_lenval.h"
#include "sandboxed_api/var_pointable.h"
#include "sandboxed_api/var_ptr.h"
namespace sapi {
namespace v {
template <typename T>
class Proto : public Pointable, public Var {
public:
explicit Proto(const T& proto) : wrapped_var_(SerializeProto(proto)) {}
size_t GetSize() const final { return wrapped_var_.GetSize(); }
Type GetType() const final { return Type::kProto; }
std::string GetTypeString() const final { return "Protobuf"; }
std::string ToString() const final { return "Protobuf"; }
Ptr* CreatePtr(Pointable::SyncType type) override {
return new Ptr(this, type);
}
void* GetRemote() const override { return wrapped_var_.GetRemote(); }
void* GetLocal() const override { return wrapped_var_.GetLocal(); }
// Returns a copy of the stored protobuf object.
std::unique_ptr<T> GetProtoCopy() const {
auto res = absl::make_unique<T>();
if (!res ||
!DeserializeProto(res.get(),
reinterpret_cast<const char*>(wrapped_var_.GetData()),
wrapped_var_.GetDataSize())) {
res.reset();
}
return res;
}
void SetRemote(void* remote) override {
// We do not support that much indirection (pointer to a pointer to a
// protobuf) as it is unlikely that this is wanted behavior. If you expect
// this to work, please get in touch with us.
LOG(FATAL) << "SetRemote not supported on protobufs.";
}
protected:
// Forward a couple of function calls to the actual var.
sapi::Status Allocate(RPCChannel* rpc_channel, bool automatic_free) override {
return wrapped_var_.Allocate(rpc_channel, automatic_free);
}
sapi::Status Free(RPCChannel* rpc_channel) override {
return sapi::OkStatus();
}
sapi::Status TransferToSandboxee(RPCChannel* rpc_channel,
pid_t pid) override {
return wrapped_var_.TransferToSandboxee(rpc_channel, pid);
}
sapi::Status TransferFromSandboxee(RPCChannel* rpc_channel,
pid_t pid) override {
return wrapped_var_.TransferFromSandboxee(rpc_channel, pid);
}
private:
// The management of reading/writing the data to the sandboxee is handled by
// the LenVal class.
LenVal wrapped_var_;
};
} // namespace v
} // namespace sapi
#endif // SANDBOXED_API_VAR_PROTO_H_