72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
// Copyright 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "sandboxed_api/var_lenval.h"
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#include <sys/types.h>
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#include <cstddef>
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#include "absl/status/status.h"
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#include "sandboxed_api/rpcchannel.h"
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#include "sandboxed_api/util/status_macros.h"
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namespace sapi::v {
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absl::Status LenVal::Allocate(RPCChannel* rpc_channel, bool automatic_free) {
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SAPI_RETURN_IF_ERROR(struct_.Allocate(rpc_channel, automatic_free));
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SAPI_RETURN_IF_ERROR(array_.Allocate(rpc_channel, true));
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// Set data pointer.
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struct_.mutable_data()->data = array_.GetRemote();
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return absl::OkStatus();
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}
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absl::Status LenVal::Free(RPCChannel* rpc_channel) {
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SAPI_RETURN_IF_ERROR(array_.Free(rpc_channel));
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SAPI_RETURN_IF_ERROR(struct_.Free(rpc_channel));
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return absl::OkStatus();
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}
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absl::Status LenVal::TransferToSandboxee(RPCChannel* rpc_channel, pid_t pid) {
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// Sync the structure and the underlying array.
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SAPI_RETURN_IF_ERROR(struct_.TransferToSandboxee(rpc_channel, pid));
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SAPI_RETURN_IF_ERROR(array_.TransferToSandboxee(rpc_channel, pid));
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return absl::OkStatus();
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}
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absl::Status LenVal::TransferFromSandboxee(RPCChannel* rpc_channel, pid_t pid) {
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// Sync the structure back.
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SAPI_RETURN_IF_ERROR(struct_.TransferFromSandboxee(rpc_channel, pid));
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// Resize the local array if required. Also make sure we own the buffer, this
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// is the only way we can be sure that the buffer is writable.
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size_t new_size = struct_.data().size;
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SAPI_RETURN_IF_ERROR(array_.EnsureOwnedLocalBuffer(new_size));
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// Remote pointer might have changed, update it.
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array_.SetRemote(struct_.data().data);
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return array_.TransferFromSandboxee(rpc_channel, pid);
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}
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absl::Status LenVal::ResizeData(RPCChannel* rpc_channel, size_t size) {
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SAPI_RETURN_IF_ERROR(array_.Resize(rpc_channel, size));
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auto* struct_data = struct_.mutable_data();
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struct_data->data = array_.GetRemote();
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struct_data->size = size;
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return absl::OkStatus();
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}
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} // namespace sapi::v
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