sandboxed-api/oss-internship-2020/gdal/raster_to_gtiff/gdal_sandbox.h

// Copyright 2020 Google LLC
//
// 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.

#ifndef GDAL_SANDBOX_H_
#define GDAL_SANDBOX_H_

#include <syscall.h>

#include <iostream>
#include <string>

#include "sandboxed_api/sandbox2/util/fileops.h"

#include "gdal_sapi.sapi.h"  // NOLINT(build/include)

namespace gdal::sandbox {

class GdalSapiSandbox : public gdalSandbox {
 public:
  GdalSapiSandbox(std::string out_directory_path,
                  std::string proj_db_path, 
                  time_t time_limit = 0) 
    : gdalSandbox(),
      out_directory_path_(std::move(out_directory_path)),
      proj_db_path_(std::move(proj_db_path))
    {
      SetWallTimeLimit(time_limit).IgnoreError();
    }

 private:
  std::unique_ptr<sandbox2::Policy> ModifyPolicy(
      sandbox2::PolicyBuilder*) override {

      return sandbox2::PolicyBuilder()
        .AllowDynamicStartup()
        .AllowRead()
        .AllowSystemMalloc()
        .AllowWrite()
        .AllowExit()
        .AllowOpen()
        .AllowSyscalls({
            __NR_futex,
            __NR_getdents64,  // DriverRegisterAll()
            __NR_lseek,  // GDALCreate()
            __NR_getpid,  // GDALCreate()
            __NR_sysinfo,  // VSI_TIFFOpen_common()
            __NR_prlimit64,  // CPLGetUsablePhysicalRAM()
            __NR_ftruncate,  // GTiffDataset::FillEmptyTiles()
            __NR_unlink,  // GDALDriver::Delete()
        })
        .AddFile(proj_db_path_)  // proj.db is required for some projections
        .AddDirectory(out_directory_path_, /*is_ro=*/false)
        .BuildOrDie();
  }

  std::string out_directory_path_;
  std::string proj_db_path_;
};

}  // namespace gdal::sandbox

#endif  // GDAL_SANDBOX_H_