// Copyright 2020 The gVisor Authors. // // 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. #include <net/if.h> #include <sched.h> #include <sys/ioctl.h> #include <sys/socket.h> #include <sys/types.h> #include "gmock/gmock.h" #include "gtest/gtest.h" #include "test/syscalls/linux/socket_test_util.h" #include "test/util/capability_util.h" #include "test/util/posix_error.h" #include "test/util/test_util.h" #include "test/util/thread_util.h" namespace gvisor { namespace testing { namespace { TEST(NetworkNamespaceTest, LoopbackExists) { SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_ADMIN))); ScopedThread t([&] { ASSERT_THAT(unshare(CLONE_NEWNET), SyscallSucceedsWithValue(0)); // TODO(gvisor.dev/issue/1833): Update this to test that only "lo" exists. // Check loopback device exists. int sock = socket(AF_INET, SOCK_DGRAM, 0); ASSERT_THAT(sock, SyscallSucceeds()); struct ifreq ifr; strncpy(ifr.ifr_name, "lo", IFNAMSIZ); EXPECT_THAT(ioctl(sock, SIOCGIFINDEX, &ifr), SyscallSucceeds()) << "lo cannot be found"; }); } } // namespace } // namespace testing } // namespace gvisor