mirror of
https://github.com/netbirdio/gvisor.git
synced 2026-05-22 17:12:49 -07:00
Andrei Vagin
126 lines
4.1 KiB
C++
126 lines
4.1 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 regular 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, Socket) {
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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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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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