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// Copyright 2018 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 <sys/stat.h>
#include <sys/un.h>
#include <unistd.h>
#include <vector>
#include "gtest/gtest.h"
#include "test/util/file_descriptor.h"
#include "test/util/temp_path.h"
#include "test/util/test_util.h"
#include "test/util/thread_util.h"
namespace gvisor {
namespace testing {
namespace {
TEST(MknodTest, RegularFile) {
const std::string node0 = NewTempAbsPath();
EXPECT_THAT(mknod(node0.c_str(), S_IFREG, 0), SyscallSucceeds());
const std::string node1 = NewTempAbsPath();
EXPECT_THAT(mknod(node1.c_str(), 0, 0), SyscallSucceeds());
}
TEST(MknodTest, MknodAtRegularFile) {
const TempPath dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir());
const std::string fifo_relpath = NewTempRelPath();
const std::string fifo = JoinPath(dir.path(), fifo_relpath);
const FileDescriptor dirfd =
ASSERT_NO_ERRNO_AND_VALUE(Open(dir.path().c_str(), O_RDONLY));
ASSERT_THAT(mknodat(dirfd.get(), fifo_relpath.c_str(), S_IFIFO | S_IRUSR, 0),
SyscallSucceeds());
struct stat st;
ASSERT_THAT(stat(fifo.c_str(), &st), SyscallSucceeds());
EXPECT_TRUE(S_ISFIFO(st.st_mode));
}
TEST(MknodTest, MknodOnExistingPathFails) {
const TempPath file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
const TempPath slink = ASSERT_NO_ERRNO_AND_VALUE(
TempPath::CreateSymlinkTo(GetAbsoluteTestTmpdir(), file.path()));
EXPECT_THAT(mknod(file.path().c_str(), S_IFREG, 0),
SyscallFailsWithErrno(EEXIST));
EXPECT_THAT(mknod(file.path().c_str(), S_IFIFO, 0),
SyscallFailsWithErrno(EEXIST));
EXPECT_THAT(mknod(slink.path().c_str(), S_IFREG, 0),
SyscallFailsWithErrno(EEXIST));
EXPECT_THAT(mknod(slink.path().c_str(), S_IFIFO, 0),
SyscallFailsWithErrno(EEXIST));
}
TEST(MknodTest, UnimplementedTypesReturnError) {
const std::string path = NewTempAbsPath();
if (IsRunningOnGvisor()) {
ASSERT_THAT(mknod(path.c_str(), S_IFSOCK, 0),
SyscallFailsWithErrno(EOPNOTSUPP));
}
// These will fail on linux as well since we don't have CAP_MKNOD.
ASSERT_THAT(mknod(path.c_str(), S_IFCHR, 0), SyscallFailsWithErrno(EPERM));
ASSERT_THAT(mknod(path.c_str(), S_IFBLK, 0), SyscallFailsWithErrno(EPERM));
}
TEST(MknodTest, Fifo) {
const std::string fifo = NewTempAbsPath();
ASSERT_THAT(mknod(fifo.c_str(), S_IFIFO | S_IRUSR | S_IWUSR, 0),
SyscallSucceeds());
struct stat st;
ASSERT_THAT(stat(fifo.c_str(), &st), SyscallSucceeds());
EXPECT_TRUE(S_ISFIFO(st.st_mode));
std::string msg = "some std::string";
std::vector<char> buf(512);
// Read-end of the pipe.
ScopedThread t([&fifo, &buf, &msg]() {
FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(fifo.c_str(), O_RDONLY));
EXPECT_THAT(ReadFd(fd.get(), buf.data(), buf.size()),
SyscallSucceedsWithValue(msg.length()));
EXPECT_EQ(msg, std::string(buf.data()));
});
// Write-end of the pipe.
FileDescriptor wfd = ASSERT_NO_ERRNO_AND_VALUE(Open(fifo.c_str(), O_WRONLY));
EXPECT_THAT(WriteFd(wfd.get(), msg.c_str(), msg.length()),
SyscallSucceedsWithValue(msg.length()));
}
TEST(MknodTest, FifoOtrunc) {
const std::string fifo = NewTempAbsPath();
ASSERT_THAT(mknod(fifo.c_str(), S_IFIFO | S_IRUSR | S_IWUSR, 0),
SyscallSucceeds());
struct stat st = {};
ASSERT_THAT(stat(fifo.c_str(), &st), SyscallSucceeds());
EXPECT_TRUE(S_ISFIFO(st.st_mode));
std::string msg = "some std::string";
std::vector<char> buf(512);
// Read-end of the pipe.
ScopedThread t([&fifo, &buf, &msg]() {
FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(fifo.c_str(), O_RDONLY));
EXPECT_THAT(ReadFd(fd.get(), buf.data(), buf.size()),
SyscallSucceedsWithValue(msg.length()));
EXPECT_EQ(msg, std::string(buf.data()));
});
// Write-end of the pipe.
FileDescriptor wfd =
ASSERT_NO_ERRNO_AND_VALUE(Open(fifo.c_str(), O_WRONLY | O_TRUNC));
EXPECT_THAT(WriteFd(wfd.get(), msg.c_str(), msg.length()),
SyscallSucceedsWithValue(msg.length()));
}
TEST(MknodTest, FifoTruncNoOp) {
const std::string fifo = NewTempAbsPath();
ASSERT_THAT(mknod(fifo.c_str(), S_IFIFO | S_IRUSR | S_IWUSR, 0),
SyscallSucceeds());
EXPECT_THAT(truncate(fifo.c_str(), 0), SyscallFailsWithErrno(EINVAL));
struct stat st = {};
ASSERT_THAT(stat(fifo.c_str(), &st), SyscallSucceeds());
EXPECT_TRUE(S_ISFIFO(st.st_mode));
std::string msg = "some std::string";
std::vector<char> buf(512);
// Read-end of the pipe.
ScopedThread t([&fifo, &buf, &msg]() {
FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(Open(fifo.c_str(), O_RDONLY));
EXPECT_THAT(ReadFd(fd.get(), buf.data(), buf.size()),
SyscallSucceedsWithValue(msg.length()));
EXPECT_EQ(msg, std::string(buf.data()));
});
FileDescriptor wfd =
ASSERT_NO_ERRNO_AND_VALUE(Open(fifo.c_str(), O_WRONLY | O_TRUNC));
EXPECT_THAT(ftruncate(wfd.get(), 0), SyscallFailsWithErrno(EINVAL));
EXPECT_THAT(WriteFd(wfd.get(), msg.c_str(), msg.length()),
SyscallSucceedsWithValue(msg.length()));
EXPECT_THAT(ftruncate(wfd.get(), 0), SyscallFailsWithErrno(EINVAL));
}
} // namespace
} // namespace testing
} // namespace gvisor
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