81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
// Copyright 2019 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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// This file is an example of a network sandboxed binary inside a network
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// namespace. It can't connect with the server directly, but the executor can
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// establish a connection and pass the connected socket to the sandboxee.
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#include <unistd.h>
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#include <cstdint>
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#include <cstdio>
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#include <cstring>
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#include "absl/log/log.h"
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#include "absl/strings/str_format.h"
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#include "sandboxed_api/sandbox2/client.h"
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#include "sandboxed_api/sandbox2/comms.h"
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static ssize_t ReadFromFd(int fd, uint8_t* buf, size_t size) {
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ssize_t received = 0;
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while (received < size) {
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ssize_t read_status =
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TEMP_FAILURE_RETRY(read(fd, &buf[received], size - received));
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if (read_status == 0) {
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break;
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}
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if (read_status < 0) {
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return -1;
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}
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received += read_status;
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}
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return received;
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}
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static bool CommunicationTest(int sock) {
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char received[1025] = {0};
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if (ReadFromFd(sock, reinterpret_cast<uint8_t*>(received),
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sizeof(received) - 1) <= 0) {
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LOG(ERROR) << "Data receiving error";
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return false;
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}
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absl::PrintF("Sandboxee received data from the server:\n\n%s\n", received);
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if (strcmp(received, "Hello World\n")) {
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LOG(ERROR) << "Data receiving error";
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return false;
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}
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return true;
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}
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int main(int argc, char* argv[]) {
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// Set-up the sandbox2::Client object, using a file descriptor (1023).
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sandbox2::Comms comms(sandbox2::Comms::kDefaultConnection);
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sandbox2::Client sandbox2_client(&comms);
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// Enable sandboxing from here.
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sandbox2_client.SandboxMeHere();
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int client;
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if (!comms.RecvFD(&client)) {
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fputs("sandboxee: !comms.RecvFD(&client) failed\n", stderr);
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return 1;
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}
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if (!CommunicationTest(client)) {
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return 2;
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}
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return 0;
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}
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