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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 <sys/socket.h>
#include <sys/stat.h>
#include <sys/statfs.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include "gtest/gtest.h"
#include "test/util/file_descriptor.h"
#include "test/util/socket_util.h"
#include "test/util/temp_umask.h"
#include "test/util/test_util.h"
namespace gvisor {
namespace testing {
// From linux/magic.h, but we can't depend on linux headers here.
#define SOCKFS_MAGIC 0x534F434B
TEST(SocketTest, UnixSocketPairProtocol) {
int socks[2];
ASSERT_THAT(socketpair(AF_UNIX, SOCK_STREAM, PF_UNIX, socks),
SyscallSucceeds());
close(socks[0]);
close(socks[1]);
}
TEST(SocketTest, ProtocolUnix) {
struct {
int domain, type, protocol;
} tests[] = {
{AF_UNIX, SOCK_STREAM, PF_UNIX},
{AF_UNIX, SOCK_SEQPACKET, PF_UNIX},
{AF_UNIX, SOCK_DGRAM, PF_UNIX},
};
for (size_t i = 0; i < ABSL_ARRAYSIZE(tests); i++) {
ASSERT_NO_ERRNO_AND_VALUE(
Socket(tests[i].domain, tests[i].type, tests[i].protocol));
}
}
TEST(SocketTest, ProtocolInet) {
struct {
int domain, type, protocol;
} tests[] = {
{AF_INET, SOCK_DGRAM, IPPROTO_UDP},
{AF_INET, SOCK_STREAM, IPPROTO_TCP},
};
for (size_t i = 0; i < ABSL_ARRAYSIZE(tests); i++) {
ASSERT_NO_ERRNO_AND_VALUE(
Socket(tests[i].domain, tests[i].type, tests[i].protocol));
}
}
TEST(SocketTest, UnixSocketStat) {
SKIP_IF(IsRunningWithVFS1());
FileDescriptor bound =
ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_UNIX, SOCK_STREAM, PF_UNIX));
// The permissions of the file created with bind(2) should be defined by the
// permissions of the bound socket and the umask.
mode_t sock_perm = 0765, mask = 0123;
ASSERT_THAT(fchmod(bound.get(), sock_perm), SyscallSucceeds());
TempUmask m(mask);
struct sockaddr_un addr =
ASSERT_NO_ERRNO_AND_VALUE(UniqueUnixAddr(/*abstract=*/false, AF_UNIX));
ASSERT_THAT(bind(bound.get(), reinterpret_cast<struct sockaddr*>(&addr),
sizeof(addr)),
SyscallSucceeds());
struct stat statbuf = {};
ASSERT_THAT(stat(addr.sun_path, &statbuf), SyscallSucceeds());
// Mode should be S_IFSOCK.
EXPECT_EQ(statbuf.st_mode, S_IFSOCK | (sock_perm & ~mask));
// Timestamps should be equal and non-zero.
if (!IsRunningWithVFS1()) {
EXPECT_NE(statbuf.st_atime, 0);
EXPECT_EQ(statbuf.st_atime, statbuf.st_mtime);
EXPECT_EQ(statbuf.st_atime, statbuf.st_ctime);
}
}
TEST(SocketTest, UnixSocketStatFS) {
SKIP_IF(IsRunningWithVFS1());
FileDescriptor bound =
ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_UNIX, SOCK_STREAM, PF_UNIX));
struct statfs st;
EXPECT_THAT(fstatfs(bound.get(), &st), SyscallSucceeds());
EXPECT_EQ(st.f_type, SOCKFS_MAGIC);
EXPECT_EQ(st.f_bsize, getpagesize());
EXPECT_EQ(st.f_namelen, NAME_MAX);
}
TEST(SocketTest, UnixSCMRightsOnlyPassedOnce) {
const DisableSave ds;
int sockets[2];
ASSERT_THAT(socketpair(AF_UNIX, SOCK_STREAM, 0, sockets), SyscallSucceeds());
// Send more than what will fit inside the send/receive buffers, so that it is
// split into multiple messages.
constexpr int kBufSize = 0x100000;
// Heap allocation is async-signal-unsafe and thus cannot occur between fork()
// and execve().
std::vector<char> buf(kBufSize);
pid_t pid = fork();
if (pid == 0) {
TEST_PCHECK(close(sockets[0]) == 0);
// Construct a message with some control message.
struct msghdr msg = {};
char control[CMSG_SPACE(sizeof(int))] = {};
struct iovec iov = {};
msg.msg_control = control;
msg.msg_controllen = sizeof(control);
struct cmsghdr* cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
((int*)CMSG_DATA(cmsg))[0] = sockets[1];
iov.iov_base = buf.data();
iov.iov_len = kBufSize;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
int n = sendmsg(sockets[1], &msg, 0);
TEST_PCHECK(n == kBufSize);
TEST_PCHECK(shutdown(sockets[1], SHUT_RDWR) == 0);
TEST_PCHECK(close(sockets[1]) == 0);
_exit(0);
}
close(sockets[1]);
struct msghdr msg = {};
char control[CMSG_SPACE(sizeof(int))] = {};
struct iovec iov = {};
msg.msg_control = &control;
msg.msg_controllen = sizeof(control);
iov.iov_base = buf.data();
iov.iov_len = kBufSize;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
// The control message should only be present in the first message received.
int n;
ASSERT_THAT(n = recvmsg(sockets[0], &msg, 0), SyscallSucceeds());
ASSERT_GT(n, 0);
ASSERT_EQ(msg.msg_controllen, CMSG_SPACE(sizeof(int)));
while (n > 0) {
ASSERT_THAT(n = recvmsg(sockets[0], &msg, 0), SyscallSucceeds());
ASSERT_EQ(msg.msg_controllen, 0);
}
close(sockets[0]);
int status;
ASSERT_THAT(waitpid(pid, &status, 0), SyscallSucceedsWithValue(pid));
ASSERT_TRUE(WIFEXITED(status) && WEXITSTATUS(status) == 0);
}
using SocketOpenTest = ::testing::TestWithParam<int>;
// UDS cannot be opened.
TEST_P(SocketOpenTest, Unix) {
// FIXME(b/142001530): Open incorrectly succeeds on gVisor.
SKIP_IF(IsRunningWithVFS1());
FileDescriptor bound =
ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_UNIX, SOCK_STREAM, PF_UNIX));
struct sockaddr_un addr =
ASSERT_NO_ERRNO_AND_VALUE(UniqueUnixAddr(/*abstract=*/false, AF_UNIX));
ASSERT_THAT(bind(bound.get(), reinterpret_cast<struct sockaddr*>(&addr),
sizeof(addr)),
SyscallSucceeds());
EXPECT_THAT(open(addr.sun_path, GetParam()), SyscallFailsWithErrno(ENXIO));
}
INSTANTIATE_TEST_SUITE_P(OpenModes, SocketOpenTest,
::testing::Values(O_RDONLY, O_RDWR));
} // namespace testing
} // namespace gvisor
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