113 lines
3.3 KiB
C++
113 lines
3.3 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 <linux/futex.h>
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#include <syscall.h>
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#include <uv.h>
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#include <iostream>
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#include "absl/flags/flag.h"
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#include "uv_sapi.sapi.h" // NOLINT(build/include)
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namespace {
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class UVSapiUVCatSandbox : public uv::UVSandbox {
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public:
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UVSapiUVCatSandbox(std::string filename) : filename(filename) {}
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private:
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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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.AddFile(filename)
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.AllowDynamicStartup()
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.AllowExit()
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.AllowFork()
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.AllowFutexOp(FUTEX_WAKE_PRIVATE)
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.AllowFutexOp(FUTEX_WAIT_PRIVATE)
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.AllowMmap()
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.AllowOpen()
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.AllowSyscalls({__NR_epoll_create1, __NR_epoll_ctl, __NR_epoll_wait,
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__NR_eventfd2, __NR_pipe2, __NR_prlimit64})
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.AllowWrite()
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.BuildOrDie();
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}
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std::string filename;
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};
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absl::Status UVCat(std::string filearg) {
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// Initialize sandbox2 and sapi
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UVSapiUVCatSandbox sandbox(filearg);
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SAPI_RETURN_IF_ERROR(sandbox.Init());
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uv::UVApi api(&sandbox);
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// Get remote pointer to the OnOpen method
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void* function_ptr;
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SAPI_RETURN_IF_ERROR(sandbox.rpc_channel()->Symbol("OnOpen", &function_ptr));
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sapi::v::RemotePtr on_open(function_ptr);
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// Get remote pointer to the open_req variable
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void* open_req_voidptr;
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SAPI_RETURN_IF_ERROR(
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sandbox.rpc_channel()->Symbol("open_req", &open_req_voidptr));
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sapi::v::RemotePtr open_req(open_req_voidptr);
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// Get default loop
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SAPI_ASSIGN_OR_RETURN(void* loop_voidptr, api.sapi_uv_default_loop());
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sapi::v::RemotePtr loop(loop_voidptr);
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int return_code;
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// Open file using the OnOpen callback (which will also read and print it)
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sapi::v::ConstCStr filename(filearg.c_str());
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SAPI_ASSIGN_OR_RETURN(
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return_code, api.sapi_uv_fs_open(&loop, &open_req, filename.PtrBefore(),
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O_RDONLY, 0, &on_open));
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if (return_code != 0) {
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return absl::UnavailableError("uv_fs_open returned error " + return_code);
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}
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// Run loop
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SAPI_ASSIGN_OR_RETURN(return_code, api.sapi_uv_run(&loop, UV_RUN_DEFAULT));
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if (return_code != 0) {
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return absl::UnavailableError("uv_run returned error " + return_code);
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}
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// Cleanup the request
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SAPI_RETURN_IF_ERROR(api.sapi_uv_fs_req_cleanup(&open_req));
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return absl::OkStatus();
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}
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} // namespace
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int main(int argc, char* argv[]) {
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gflags::ParseCommandLineFlags(&argc, &argv, true);
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sapi::InitLogging(argv[0]);
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if (argc != 2) {
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LOG(ERROR) << "wrong number of arguments (1 expected)";
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return EXIT_FAILURE;
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}
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if (absl::Status status = UVCat(argv[1]); !status.ok()) {
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LOG(ERROR) << "UVCat 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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