99 lines
2.5 KiB
C++
99 lines
2.5 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_int.h"
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#include <unistd.h>
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#include "absl/log/log.h"
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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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Fd::~Fd() {
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if (GetFreeRPCChannel() && GetRemoteFd() >= 0 && own_remote_) {
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this->CloseRemoteFd(GetFreeRPCChannel()).IgnoreError();
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}
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if (GetValue() >= 0 && own_local_) {
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CloseLocalFd();
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}
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}
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absl::Status Fd::CloseRemoteFd(RPCChannel* rpc_channel) {
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SAPI_RETURN_IF_ERROR(rpc_channel->Close(GetRemoteFd()));
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SetRemoteFd(-1);
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return absl::OkStatus();
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}
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void Fd::CloseLocalFd() {
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if (GetValue() < 0) {
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return;
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}
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if (close(GetValue()) != 0) {
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PLOG(WARNING) << "close(" << GetValue() << ") failed";
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}
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SetValue(-1);
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}
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absl::Status Fd::TransferToSandboxee(RPCChannel* rpc_channel, pid_t /* pid */) {
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int remote_fd;
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SetFreeRPCChannel(rpc_channel);
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OwnRemoteFd(true);
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if (GetValue() < 0) {
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return absl::FailedPreconditionError(
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"Cannot transfer FD: Local FD not valid");
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}
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if (GetRemoteFd() >= 0) {
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return absl::FailedPreconditionError(
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"Cannot transfer FD: Sandboxee already has a valid FD");
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}
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SAPI_RETURN_IF_ERROR(rpc_channel->SendFD(GetValue(), &remote_fd));
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SetRemoteFd(remote_fd);
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return absl::OkStatus();
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}
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absl::Status Fd::TransferFromSandboxee(RPCChannel* rpc_channel,
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pid_t /* pid */) {
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int local_fd;
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SetFreeRPCChannel(rpc_channel);
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OwnRemoteFd(false);
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if (GetValue()) {
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return absl::FailedPreconditionError(
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"Cannot transfer FD back: Our FD is already valid");
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}
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if (GetRemoteFd() < 0) {
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return absl::FailedPreconditionError(
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"Cannot transfer FD back: Sandboxee has no valid FD");
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}
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SAPI_RETURN_IF_ERROR(rpc_channel->RecvFD(GetRemoteFd(), &local_fd));
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SetValue(local_fd);
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return absl::OkStatus();
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}
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} // namespace sapi::v
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