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// 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
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