github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/test/syscalls/linux/network_namespace.cc (about)

     1  // Copyright 2020 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  #include <net/if.h>
    16  #include <sched.h>
    17  #include <sys/ioctl.h>
    18  #include <sys/socket.h>
    19  #include <sys/types.h>
    20  
    21  #include "gmock/gmock.h"
    22  #include "gtest/gtest.h"
    23  #include "test/syscalls/linux/socket_test_util.h"
    24  #include "test/util/capability_util.h"
    25  #include "test/util/posix_error.h"
    26  #include "test/util/test_util.h"
    27  #include "test/util/thread_util.h"
    28  
    29  namespace gvisor {
    30  namespace testing {
    31  namespace {
    32  
    33  TEST(NetworkNamespaceTest, LoopbackExists) {
    34    SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_NET_ADMIN)));
    35  
    36    ScopedThread t([&] {
    37      ASSERT_THAT(unshare(CLONE_NEWNET), SyscallSucceedsWithValue(0));
    38  
    39      // TODO(gvisor.dev/issue/1833): Update this to test that only "lo" exists.
    40      // Check loopback device exists.
    41      int sock = socket(AF_INET, SOCK_DGRAM, 0);
    42      ASSERT_THAT(sock, SyscallSucceeds());
    43      struct ifreq ifr;
    44      strncpy(ifr.ifr_name, "lo", IFNAMSIZ);
    45      EXPECT_THAT(ioctl(sock, SIOCGIFINDEX, &ifr), SyscallSucceeds())
    46          << "lo cannot be found";
    47    });
    48  }
    49  
    50  }  // namespace
    51  }  // namespace testing
    52  }  // namespace gvisor