mirror of
https://github.com/google/sandboxed-api.git
synced 2024-03-22 13:11:30 +08:00
124 lines
3.9 KiB
C++
124 lines
3.9 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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// http://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 "guetzli_transaction.h" // NOLINT(build/include)
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <iostream>
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#include <memory>
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namespace guetzli::sandbox {
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absl::Status GuetzliTransaction::Main() {
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sapi::v::Fd in_fd(open(params_.in_file, O_RDONLY));
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if (in_fd.GetValue() < 0) {
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return absl::FailedPreconditionError("Error opening input file");
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}
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SAPI_ASSIGN_OR_RETURN(image_type_, GetImageTypeFromFd(in_fd.GetValue()));
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SAPI_RETURN_IF_ERROR(sandbox()->TransferToSandboxee(&in_fd));
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if (in_fd.GetRemoteFd() < 0) {
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return absl::FailedPreconditionError(
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"Error receiving remote FD: remote input fd is set to -1");
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}
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GuetzliApi api(sandbox());
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sapi::v::LenVal output(0);
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sapi::v::Struct<ProcessingParams> processing_params;
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*processing_params.mutable_data() = {in_fd.GetRemoteFd(), params_.verbose,
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params_.quality, params_.memlimit_mb};
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auto result =
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image_type_ == ImageType::kJpeg
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? api.ProcessJpeg(processing_params.PtrBefore(), output.PtrBefore())
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: api.ProcessRgb(processing_params.PtrBefore(), output.PtrBefore());
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if (!result.value_or(false)) {
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return absl::FailedPreconditionError(absl::StrCat(
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"Error processing ", (image_type_ == ImageType::kJpeg ? "jpeg" : "rgb"),
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" data"));
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}
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sapi::v::Fd out_fd(open(".", O_TMPFILE | O_RDWR, S_IRUSR | S_IWUSR));
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if (out_fd.GetValue() < 0) {
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return absl::FailedPreconditionError("Error creating temp output file");
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}
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SAPI_RETURN_IF_ERROR(sandbox()->TransferToSandboxee(&out_fd));
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if (out_fd.GetRemoteFd() < 0) {
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return absl::FailedPreconditionError(
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"Error receiving remote FD: remote output fd is set to -1");
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}
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auto write_result = api.WriteDataToFd(out_fd.GetRemoteFd(), output.PtrNone());
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if (!write_result.value_or(false)) {
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return absl::FailedPreconditionError("Error writing file inside sandbox");
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}
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SAPI_RETURN_IF_ERROR(LinkOutFile(out_fd.GetValue()));
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return absl::OkStatus();
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}
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absl::Status GuetzliTransaction::LinkOutFile(int out_fd) const {
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if (access(params_.out_file, F_OK) != -1) {
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if (remove(params_.out_file) < 0) {
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return absl::FailedPreconditionError(absl::StrCat(
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"Error deleting existing output file: ", params_.out_file));
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}
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}
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std::string path = absl::StrCat("/proc/self/fd/", out_fd);
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if (linkat(AT_FDCWD, path.c_str(), AT_FDCWD, params_.out_file,
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AT_SYMLINK_FOLLOW) < 0) {
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return absl::FailedPreconditionError(
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absl::StrCat("Error linking: ", params_.out_file));
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}
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return absl::OkStatus();
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}
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absl::StatusOr<ImageType> GuetzliTransaction::GetImageTypeFromFd(int fd) const {
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static const unsigned char kPNGMagicBytes[] = {
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0x89, 'P', 'N', 'G', '\r', '\n', 0x1a, '\n',
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};
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char read_buf[sizeof(kPNGMagicBytes)];
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if (read(fd, read_buf, sizeof(kPNGMagicBytes)) != sizeof(kPNGMagicBytes)) {
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return absl::FailedPreconditionError(
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"Error determining type of the input file");
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}
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if (lseek(fd, 0, SEEK_SET) != 0) {
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return absl::FailedPreconditionError(
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"Error returnig cursor to the beginning");
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}
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return memcmp(read_buf, kPNGMagicBytes, sizeof(kPNGMagicBytes)) == 0
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? ImageType::kPng
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: ImageType::kJpeg;
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}
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} // namespace guetzli::sandbox
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