133 lines
4.2 KiB
C++
133 lines
4.2 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 <libgen.h>
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#include <syscall.h>
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#include <cstdlib>
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#include <iostream>
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#include "jsonnet_sapi.sapi.h" // NOLINT(build/include)
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#include "absl/flags/parse.h"
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#include "absl/log/check.h"
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#include "absl/log/globals.h"
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#include "absl/log/initialize.h"
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#include "sandboxed_api/util/fileops.h"
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#include "sandboxed_api/util/path.h"
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class JsonnetSapiSandbox : public JsonnetSandbox {
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public:
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explicit JsonnetSapiSandbox(std::string in_file, std::string out_file)
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: in_file_(std::move(in_file)), out_file_(std::move(out_file)) {}
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// We need only the input file here, not the whole input directory
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std::unique_ptr<sandbox2::Policy> ModifyPolicy(
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sandbox2::PolicyBuilder*) override {
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return sandbox2::PolicyBuilder()
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.AllowStaticStartup()
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.AllowOpen()
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.AllowRead()
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.AllowWrite()
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.AllowStat()
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.AllowSystemMalloc()
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.AllowExit()
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.AllowSyscalls({
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__NR_futex,
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__NR_close,
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})
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.AddDirectoryAt(dirname(&out_file_[0]), "/output", /*is_ro=*/false)
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.AddFile(in_file_, true)
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.BuildOrDie();
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}
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private:
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std::string in_file_;
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std::string out_file_;
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};
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absl::Status JsonnetMain(std::string in_file, std::string out_file) {
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using sapi::file::JoinPath;
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using sapi::file_util::fileops::Basename;
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// Initialize sandbox.
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JsonnetSapiSandbox sandbox(in_file, out_file);
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SAPI_RETURN_IF_ERROR(sandbox.Init());
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JsonnetApi api(&sandbox);
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// Initialize library's main structure.
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SAPI_ASSIGN_OR_RETURN(JsonnetVm * jsonnet_vm, api.c_jsonnet_make());
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sapi::v::RemotePtr vm_pointer(jsonnet_vm);
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// Read input file.
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std::string in_file_in_sandboxee(JoinPath("/input", Basename(in_file)));
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sapi::v::ConstCStr in_file_var(in_file_in_sandboxee.c_str());
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SAPI_ASSIGN_OR_RETURN(char* input,
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api.c_read_input(false, in_file_var.PtrBefore()));
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// Process jsonnet data.
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sapi::v::RemotePtr input_pointer(input);
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sapi::v::Int error;
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SAPI_ASSIGN_OR_RETURN(char* output, api.c_jsonnet_fmt_snippet(
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&vm_pointer, in_file_var.PtrBefore(),
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&input_pointer, error.PtrAfter()));
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CHECK(!error.GetValue()) << "Jsonnet code evaluation failed: "
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<< error.GetValue() << "\n";
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// Write data to file.
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std::string out_file_in_sandboxee(JoinPath("/output", Basename(out_file)));
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sapi::v::ConstCStr out_file_var(out_file_in_sandboxee.c_str());
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sapi::v::RemotePtr output_pointer(output);
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SAPI_ASSIGN_OR_RETURN(
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bool success,
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api.c_write_output_file(&output_pointer, out_file_var.PtrBefore()));
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CHECK(success) << "Writing to output file failed: " << success;
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// Clean up.
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SAPI_ASSIGN_OR_RETURN(char* result,
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api.c_jsonnet_realloc(&vm_pointer, &output_pointer, 0));
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SAPI_RETURN_IF_ERROR(api.c_jsonnet_destroy(&vm_pointer));
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SAPI_RETURN_IF_ERROR(api.c_free_input(&input_pointer));
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return absl::OkStatus();
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}
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int main(int argc, char* argv[]) {
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using sapi::file_util::fileops::Basename;
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absl::SetStderrThreshold(absl::LogSeverityAtLeast::kInfo);
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absl::ParseCommandLine(argc, argv);
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absl::InitializeLog();
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if (argc != 3) {
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std::cerr << "Usage:\n"
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<< Basename(argv[0])
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<< " /absolute/path/to/INPUT.jsonnet /absolute/path/to/OUTPUT\n";
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return EXIT_FAILURE;
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}
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std::string in_file(argv[1]);
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std::string out_file(argv[2]);
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absl::Status status = JsonnetMain(in_file, out_file);
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if (!status.ok()) {
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LOG(ERROR) << "Failed: " << status.ToString();
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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