235 lines
7.9 KiB
C++
235 lines
7.9 KiB
C++
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/un.h>
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#include <unistd.h>
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#include <vector>
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#include "gtest/gtest.h"
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#include "test/util/file_descriptor.h"
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#include "test/util/temp_path.h"
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#include "test/util/test_util.h"
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#include "test/util/thread_util.h"
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namespace gvisor {
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namespace testing {
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namespace {
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TEST(MknodTest, RegularFile) {
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const std::string node0 = NewTempAbsPath();
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EXPECT_THAT(mknod(node0.c_str(), S_IFREG, 0), SyscallSucceeds());
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const std::string node1 = NewTempAbsPath();
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EXPECT_THAT(mknod(node1.c_str(), 0, 0), SyscallSucceeds());
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}
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TEST(MknodTest, RegularFilePermissions) {
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const std::string node = NewTempAbsPath();
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mode_t newUmask = 0077;
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umask(newUmask);
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// Attempt to open file with mode 0777. Not specifying file type should create
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// a regualar file.
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mode_t perms = S_IRWXU | S_IRWXG | S_IRWXO;
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EXPECT_THAT(mknod(node.c_str(), perms, 0), SyscallSucceeds());
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// In the absence of a default ACL, the permissions of the created node are
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// (mode & ~umask). -- mknod(2)
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mode_t wantPerms = perms & ~newUmask;
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struct stat st;
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ASSERT_THAT(stat(node.c_str(), &st), SyscallSucceeds());
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ASSERT_EQ(st.st_mode & 0777, wantPerms);
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// "Zero file type is equivalent to type S_IFREG." - mknod(2)
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ASSERT_EQ(st.st_mode & S_IFMT, S_IFREG);
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}
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TEST(MknodTest, MknodAtFIFO) {
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const TempPath dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir());
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const std::string fifo_relpath = NewTempRelPath();
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const std::string fifo = JoinPath(dir.path(), fifo_relpath);
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const FileDescriptor dirfd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(dir.path().c_str(), O_RDONLY));
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ASSERT_THAT(mknodat(dirfd.get(), fifo_relpath.c_str(), S_IFIFO | S_IRUSR, 0),
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SyscallSucceeds());
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struct stat st;
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ASSERT_THAT(stat(fifo.c_str(), &st), SyscallSucceeds());
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EXPECT_TRUE(S_ISFIFO(st.st_mode));
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}
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TEST(MknodTest, MknodOnExistingPathFails) {
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const TempPath file = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile());
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const TempPath slink = ASSERT_NO_ERRNO_AND_VALUE(
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TempPath::CreateSymlinkTo(GetAbsoluteTestTmpdir(), file.path()));
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EXPECT_THAT(mknod(file.path().c_str(), S_IFREG, 0),
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SyscallFailsWithErrno(EEXIST));
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EXPECT_THAT(mknod(file.path().c_str(), S_IFIFO, 0),
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SyscallFailsWithErrno(EEXIST));
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EXPECT_THAT(mknod(slink.path().c_str(), S_IFREG, 0),
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SyscallFailsWithErrno(EEXIST));
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EXPECT_THAT(mknod(slink.path().c_str(), S_IFIFO, 0),
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SyscallFailsWithErrno(EEXIST));
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}
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TEST(MknodTest, UnimplementedTypesReturnError) {
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// TODO(gvisor.dev/issue/1624): These file types are supported by some
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// filesystems in VFS2, so this test should be deleted along with VFS1.
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SKIP_IF(!IsRunningWithVFS1());
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const std::string path = NewTempAbsPath();
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EXPECT_THAT(mknod(path.c_str(), S_IFSOCK, 0),
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SyscallFailsWithErrno(EOPNOTSUPP));
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EXPECT_THAT(mknod(path.c_str(), S_IFCHR, 0), SyscallFailsWithErrno(EPERM));
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EXPECT_THAT(mknod(path.c_str(), S_IFBLK, 0), SyscallFailsWithErrno(EPERM));
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}
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TEST(MknodTest, Socket) {
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SKIP_IF(IsRunningOnGvisor() && IsRunningWithVFS1());
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ASSERT_THAT(chdir(GetAbsoluteTestTmpdir().c_str()), SyscallSucceeds());
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auto filename = NewTempRelPath();
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ASSERT_THAT(mknod(filename.c_str(), S_IFSOCK | S_IRUSR | S_IWUSR, 0),
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SyscallSucceeds());
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int sk;
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ASSERT_THAT(sk = socket(AF_UNIX, SOCK_SEQPACKET, 0), SyscallSucceeds());
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FileDescriptor fd(sk);
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struct sockaddr_un addr = {.sun_family = AF_UNIX};
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absl::SNPrintF(addr.sun_path, sizeof(addr.sun_path), "%s", filename.c_str());
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ASSERT_THAT(connect(sk, (struct sockaddr *)&addr, sizeof(addr)),
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SyscallFailsWithErrno(ECONNREFUSED));
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ASSERT_THAT(unlink(filename.c_str()), SyscallSucceeds());
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}
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PosixErrorOr<FileDescriptor> OpenRetryEINTR(std::string const& path, int flags,
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mode_t mode = 0) {
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while (true) {
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auto maybe_fd = Open(path, flags, mode);
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if (maybe_fd.ok() || maybe_fd.error().errno_value() != EINTR) {
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return maybe_fd;
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}
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}
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}
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TEST(MknodTest, Fifo) {
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const std::string fifo = NewTempAbsPath();
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ASSERT_THAT(mknod(fifo.c_str(), S_IFIFO | S_IRUSR | S_IWUSR, 0),
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SyscallSucceeds());
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struct stat st;
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ASSERT_THAT(stat(fifo.c_str(), &st), SyscallSucceeds());
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EXPECT_TRUE(S_ISFIFO(st.st_mode));
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std::string msg = "some std::string";
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std::vector<char> buf(512);
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// Read-end of the pipe.
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ScopedThread t([&fifo, &buf, &msg]() {
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FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(OpenRetryEINTR(fifo.c_str(), O_RDONLY));
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EXPECT_THAT(ReadFd(fd.get(), buf.data(), buf.size()),
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SyscallSucceedsWithValue(msg.length()));
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EXPECT_EQ(msg, std::string(buf.data()));
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});
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// Write-end of the pipe.
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FileDescriptor wfd =
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ASSERT_NO_ERRNO_AND_VALUE(OpenRetryEINTR(fifo.c_str(), O_WRONLY));
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EXPECT_THAT(WriteFd(wfd.get(), msg.c_str(), msg.length()),
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SyscallSucceedsWithValue(msg.length()));
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}
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TEST(MknodTest, FifoOtrunc) {
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const std::string fifo = NewTempAbsPath();
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ASSERT_THAT(mknod(fifo.c_str(), S_IFIFO | S_IRUSR | S_IWUSR, 0),
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SyscallSucceeds());
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struct stat st = {};
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ASSERT_THAT(stat(fifo.c_str(), &st), SyscallSucceeds());
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EXPECT_TRUE(S_ISFIFO(st.st_mode));
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std::string msg = "some std::string";
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std::vector<char> buf(512);
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// Read-end of the pipe.
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ScopedThread t([&fifo, &buf, &msg]() {
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FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(OpenRetryEINTR(fifo.c_str(), O_RDONLY));
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EXPECT_THAT(ReadFd(fd.get(), buf.data(), buf.size()),
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SyscallSucceedsWithValue(msg.length()));
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EXPECT_EQ(msg, std::string(buf.data()));
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});
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// Write-end of the pipe.
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FileDescriptor wfd = ASSERT_NO_ERRNO_AND_VALUE(
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OpenRetryEINTR(fifo.c_str(), O_WRONLY | O_TRUNC));
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EXPECT_THAT(WriteFd(wfd.get(), msg.c_str(), msg.length()),
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SyscallSucceedsWithValue(msg.length()));
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}
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TEST(MknodTest, FifoTruncNoOp) {
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const std::string fifo = NewTempAbsPath();
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ASSERT_THAT(mknod(fifo.c_str(), S_IFIFO | S_IRUSR | S_IWUSR, 0),
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SyscallSucceeds());
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EXPECT_THAT(truncate(fifo.c_str(), 0), SyscallFailsWithErrno(EINVAL));
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struct stat st = {};
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ASSERT_THAT(stat(fifo.c_str(), &st), SyscallSucceeds());
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EXPECT_TRUE(S_ISFIFO(st.st_mode));
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std::string msg = "some std::string";
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std::vector<char> buf(512);
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// Read-end of the pipe.
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ScopedThread t([&fifo, &buf, &msg]() {
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FileDescriptor fd =
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ASSERT_NO_ERRNO_AND_VALUE(OpenRetryEINTR(fifo.c_str(), O_RDONLY));
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EXPECT_THAT(ReadFd(fd.get(), buf.data(), buf.size()),
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SyscallSucceedsWithValue(msg.length()));
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EXPECT_EQ(msg, std::string(buf.data()));
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});
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FileDescriptor wfd = ASSERT_NO_ERRNO_AND_VALUE(
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OpenRetryEINTR(fifo.c_str(), O_WRONLY | O_TRUNC));
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EXPECT_THAT(ftruncate(wfd.get(), 0), SyscallFailsWithErrno(EINVAL));
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EXPECT_THAT(WriteFd(wfd.get(), msg.c_str(), msg.length()),
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SyscallSucceedsWithValue(msg.length()));
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EXPECT_THAT(ftruncate(wfd.get(), 0), SyscallFailsWithErrno(EINVAL));
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}
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TEST(MknodTest, MknodAtEmptyPath) {
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auto dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir());
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auto fd =
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ASSERT_NO_ERRNO_AND_VALUE(Open(dir.path(), O_RDONLY | O_DIRECTORY, 0666));
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EXPECT_THAT(mknodat(fd.get(), "", S_IFREG | 0777, 0),
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SyscallFailsWithErrno(ENOENT));
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}
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} // namespace
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} // namespace testing
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} // namespace gvisor
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