github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/test/fuse/linux/readlink_test.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 <errno.h>
    16  #include <fcntl.h>
    17  #include <linux/fuse.h>
    18  #include <sys/stat.h>
    19  #include <sys/statfs.h>
    20  #include <sys/types.h>
    21  #include <unistd.h>
    22  
    23  #include <string>
    24  #include <vector>
    25  
    26  #include "gtest/gtest.h"
    27  #include "test/fuse/linux/fuse_base.h"
    28  #include "test/util/fuse_util.h"
    29  #include "test/util/test_util.h"
    30  
    31  namespace gvisor {
    32  namespace testing {
    33  
    34  namespace {
    35  
    36  class ReadlinkTest : public FuseTest {
    37   protected:
    38    const std::string test_file_ = "test_file_";
    39    const mode_t perms_ = S_IRWXU | S_IRWXG | S_IRWXO;
    40  };
    41  
    42  TEST_F(ReadlinkTest, ReadSymLink) {
    43    const std::string symlink_path =
    44        JoinPath(mount_point_.path().c_str(), test_file_);
    45    SetServerInodeLookup(test_file_, S_IFLNK | perms_);
    46  
    47    struct fuse_out_header out_header = {
    48        .len = static_cast<uint32_t>(sizeof(struct fuse_out_header)) +
    49               static_cast<uint32_t>(test_file_.length()) + 1,
    50    };
    51    std::string link = test_file_;
    52    auto iov_out = FuseGenerateIovecs(out_header, link);
    53    SetServerResponse(FUSE_READLINK, iov_out);
    54    const std::string actual_link =
    55        ASSERT_NO_ERRNO_AND_VALUE(ReadLink(symlink_path));
    56  
    57    struct fuse_in_header in_header;
    58    auto iov_in = FuseGenerateIovecs(in_header);
    59    GetServerActualRequest(iov_in);
    60  
    61    EXPECT_EQ(in_header.len, sizeof(in_header));
    62    EXPECT_EQ(in_header.opcode, FUSE_READLINK);
    63    EXPECT_EQ(0, memcmp(actual_link.c_str(), link.data(), link.size()));
    64  
    65    // next readlink should have link cached, so shouldn't have new request to
    66    // server.
    67    uint32_t recieved_before = GetServerTotalReceivedBytes();
    68    ASSERT_NO_ERRNO(ReadLink(symlink_path));
    69    EXPECT_EQ(GetServerTotalReceivedBytes(), recieved_before);
    70  }
    71  
    72  TEST_F(ReadlinkTest, NotSymlink) {
    73    const std::string test_file_path =
    74        JoinPath(mount_point_.path().c_str(), test_file_);
    75    SetServerInodeLookup(test_file_, S_IFREG | perms_);
    76  
    77    std::vector<char> buf(PATH_MAX + 1);
    78    ASSERT_THAT(readlink(test_file_path.c_str(), buf.data(), PATH_MAX),
    79                SyscallFailsWithErrno(EINVAL));
    80  }
    81  
    82  }  // namespace
    83  
    84  }  // namespace testing
    85  }  // namespace gvisor