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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 <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/fuse.h>
#include <linux/unistd.h>
#include <sys/stat.h>
#include <sys/statfs.h>
#include <sys/types.h>
#include <unistd.h>
#include <string>
#include "gtest/gtest.h"
#include "test/fuse/linux/fuse_base.h"
#include "test/util/fuse_util.h"
#include "test/util/test_util.h"
#define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
#define FUSE_DIRENT_ALIGN(x) \
(((x) + sizeof(uint64_t) - 1) & ~(sizeof(uint64_t) - 1))
#define FUSE_DIRENT_SIZE(d) FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)
namespace gvisor {
namespace testing {
namespace {
class ReaddirTest : public FuseTest {
public:
void fill_fuse_dirent(char *buf, const char *name) {
size_t namelen = strlen(name);
size_t entlen = FUSE_NAME_OFFSET + namelen;
size_t entlen_padded = FUSE_DIRENT_ALIGN(entlen);
struct fuse_dirent *dirent;
dirent = reinterpret_cast<struct fuse_dirent *>(buf);
dirent->namelen = namelen;
memcpy(dirent->name, name, namelen);
memset(dirent->name + namelen, 0, entlen_padded - entlen);
}
protected:
const std::string test_dir_name_ = "test_dir";
};
TEST_F(ReaddirTest, SingleEntry) {
const std::string test_dir_path =
JoinPath(mount_point_.path().c_str(), test_dir_name_);
// We need to make sure the test dir is a directory that can be found.
mode_t expected_mode =
S_IFDIR | S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
struct fuse_attr dir_attr = {
.ino = 1,
.size = 512,
.blocks = 4,
.mode = expected_mode,
.blksize = 4096,
};
// We need to make sure the test dir is a directory that can be found.
struct fuse_out_header lookup_header = {
.len = sizeof(struct fuse_out_header) + sizeof(struct fuse_entry_out),
};
struct fuse_entry_out lookup_payload = {
.nodeid = 1,
.entry_valid = true,
.attr_valid = true,
.attr = dir_attr,
};
struct fuse_out_header open_header = {
.len = sizeof(struct fuse_out_header) + sizeof(struct fuse_open_out),
};
struct fuse_open_out open_payload = {
.fh = 1,
};
auto iov_out = FuseGenerateIovecs(lookup_header, lookup_payload);
SetServerResponse(FUSE_LOOKUP, iov_out);
iov_out = FuseGenerateIovecs(open_header, open_payload);
SetServerResponse(FUSE_OPENDIR, iov_out);
FileDescriptor fd =
ASSERT_NO_ERRNO_AND_VALUE(Open(test_dir_path.c_str(), O_RDONLY));
// The open command makes two syscalls. Lookup the dir file and open.
// We don't need to inspect those headers in this test.
SkipServerActualRequest(); // LOOKUP.
SkipServerActualRequest(); // OPENDIR.
// Readdir test code.
std::string dot = ".";
std::string dot_dot = "..";
std::string test_file = "testFile";
// Figure out how many dirents to send over and allocate them appropriately.
// Each dirent has a dynamic name and a static metadata part. The dirent size
// is aligned to being a multiple of 8.
size_t dot_file_dirent_size =
FUSE_DIRENT_ALIGN(dot.length() + FUSE_NAME_OFFSET);
size_t dot_dot_file_dirent_size =
FUSE_DIRENT_ALIGN(dot_dot.length() + FUSE_NAME_OFFSET);
size_t test_file_dirent_size =
FUSE_DIRENT_ALIGN(test_file.length() + FUSE_NAME_OFFSET);
// Create an appropriately sized payload.
size_t readdir_payload_size =
test_file_dirent_size + dot_file_dirent_size + dot_dot_file_dirent_size;
std::vector<char> readdir_payload_vec(readdir_payload_size);
char *readdir_payload = readdir_payload_vec.data();
fill_fuse_dirent(readdir_payload, dot.c_str());
fill_fuse_dirent(readdir_payload + dot_file_dirent_size, dot_dot.c_str());
fill_fuse_dirent(
readdir_payload + dot_file_dirent_size + dot_dot_file_dirent_size,
test_file.c_str());
struct fuse_out_header readdir_header = {
.len = uint32_t(sizeof(struct fuse_out_header) + readdir_payload_size),
};
struct fuse_out_header readdir_header_break = {
.len = uint32_t(sizeof(struct fuse_out_header)),
};
iov_out = FuseGenerateIovecs(readdir_header, readdir_payload_vec);
SetServerResponse(FUSE_READDIR, iov_out);
iov_out = FuseGenerateIovecs(readdir_header_break);
SetServerResponse(FUSE_READDIR, iov_out);
std::vector<char> buf(4090, 0);
int nread, off = 0, i = 0;
EXPECT_THAT(nread = syscall(__NR_getdents64, fd.get(), buf.data(), buf.size()),
SyscallSucceeds());
for (; off < nread;) {
struct dirent64 *ent = (struct dirent64 *)(buf.data() + off);
off += ent->d_reclen;
switch (i++) {
case 0:
EXPECT_EQ(std::string(ent->d_name), dot);
break;
case 1:
EXPECT_EQ(std::string(ent->d_name), dot_dot);
break;
case 2:
EXPECT_EQ(std::string(ent->d_name), test_file);
break;
}
}
EXPECT_THAT(nread = syscall(__NR_getdents64, fd.get(), buf.data(), buf.size()),
SyscallSucceedsWithValue(0));
SkipServerActualRequest(); // READDIR.
SkipServerActualRequest(); // READDIR with no data.
// Clean up.
fd.reset(-1);
struct fuse_in_header in_header;
struct fuse_release_in in_payload;
auto iov_in = FuseGenerateIovecs(in_header, in_payload);
GetServerActualRequest(iov_in);
EXPECT_EQ(in_header.len, sizeof(in_header) + sizeof(in_payload));
EXPECT_EQ(in_header.opcode, FUSE_RELEASEDIR);
}
} // namespace
} // namespace testing
} // namespace gvisor
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