82 lines
2.6 KiB
C++
82 lines
2.6 KiB
C++
// Copyright 2020 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/sandbox2/fork_client.h"
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#include <sys/types.h>
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#include "absl/log/check.h"
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#include "absl/log/log.h"
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#include "absl/synchronization/mutex.h"
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#include "sandboxed_api/sandbox2/comms.h"
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#include "sandboxed_api/sandbox2/forkserver.pb.h"
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#include "sandboxed_api/util/fileops.h"
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namespace sandbox2 {
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using ::sapi::file_util::fileops::FDCloser;
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SandboxeeProcess ForkClient::SendRequest(const ForkRequest& request,
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int exec_fd, int comms_fd) {
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SandboxeeProcess process;
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// Acquire the channel ownership for this request (transaction).
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absl::MutexLock l(&comms_mutex_);
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if (!comms_->SendProtoBuf(request)) {
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LOG(ERROR) << "Sending PB to the ForkServer failed";
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return process;
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}
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CHECK(comms_fd != -1) << "comms_fd was not properly set up";
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if (!comms_->SendFD(comms_fd)) {
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LOG(ERROR) << "Sending Comms FD (" << comms_fd
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<< ") to the ForkServer failed";
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return process;
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}
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if (request.mode() == FORKSERVER_FORK_EXECVE ||
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request.mode() == FORKSERVER_FORK_EXECVE_SANDBOX) {
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CHECK(exec_fd != -1) << "exec_fd cannot be -1 in execve mode";
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if (!comms_->SendFD(exec_fd)) {
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LOG(ERROR) << "Sending Exec FD (" << exec_fd
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<< ") to the ForkServer failed";
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return process;
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}
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}
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int32_t pid;
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// Receive init process ID.
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if (!comms_->RecvInt32(&pid)) {
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LOG(ERROR) << "Receiving init PID from the ForkServer failed";
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return process;
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}
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process.init_pid = static_cast<pid_t>(pid);
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// Receive sandboxee process ID.
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if (!comms_->RecvInt32(&pid)) {
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LOG(ERROR) << "Receiving sandboxee PID from the ForkServer failed";
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return process;
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}
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process.main_pid = static_cast<pid_t>(pid);
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if (request.monitor_type() == FORKSERVER_MONITOR_UNOTIFY) {
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int fd = -1;
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if (!comms_->RecvFD(&fd)) {
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LOG(ERROR) << "Receiving status fd from the ForkServer failed";
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return process;
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}
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process.status_fd = FDCloser(fd);
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}
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return process;
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}
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} // namespace sandbox2
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