// 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 <errno.h> #include <fcntl.h> #include <linux/fuse.h> #include <sys/stat.h> #include <sys/statfs.h> #include <sys/types.h> #include <unistd.h> #include <string> #include <vector> #include "gtest/gtest.h" #include "test/fuse/linux/fuse_base.h" #include "test/util/fuse_util.h" #include "test/util/test_util.h" namespace gvisor { namespace testing { namespace { class ReadlinkTest : public FuseTest { protected: const std::string test_file_ = "test_file_"; const mode_t perms_ = S_IRWXU | S_IRWXG | S_IRWXO; }; TEST_F(ReadlinkTest, ReadSymLink) { const std::string symlink_path = JoinPath(mount_point_.path().c_str(), test_file_); SetServerInodeLookup(test_file_, S_IFLNK | perms_); struct fuse_out_header out_header = { .len = static_cast<uint32_t>(sizeof(struct fuse_out_header)) + static_cast<uint32_t>(test_file_.length()) + 1, }; std::string link = test_file_; auto iov_out = FuseGenerateIovecs(out_header, link); SetServerResponse(FUSE_READLINK, iov_out); const std::string actual_link = ASSERT_NO_ERRNO_AND_VALUE(ReadLink(symlink_path)); struct fuse_in_header in_header; auto iov_in = FuseGenerateIovecs(in_header); GetServerActualRequest(iov_in); EXPECT_EQ(in_header.len, sizeof(in_header)); EXPECT_EQ(in_header.opcode, FUSE_READLINK); EXPECT_EQ(0, memcmp(actual_link.c_str(), link.data(), link.size())); // next readlink should have link cached, so shouldn't have new request to // server. uint32_t recieved_before = GetServerTotalReceivedBytes(); ASSERT_NO_ERRNO(ReadLink(symlink_path)); EXPECT_EQ(GetServerTotalReceivedBytes(), recieved_before); } TEST_F(ReadlinkTest, NotSymlink) { const std::string test_file_path = JoinPath(mount_point_.path().c_str(), test_file_); SetServerInodeLookup(test_file_, S_IFREG | perms_); std::vector<char> buf(PATH_MAX + 1); ASSERT_THAT(readlink(test_file_path.c_str(), buf.data(), PATH_MAX), SyscallFailsWithErrno(EINVAL)); } } // namespace } // namespace testing } // namespace gvisor