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// Copyright 2019 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 <stdlib.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include <string>
#include <tuple>
#include "gtest/gtest.h"
#include "test/syscalls/linux/socket_test_util.h"
#include "test/util/file_descriptor.h"
#include "test/util/fs_util.h"
#include "test/util/test_util.h"
// This file contains tests specific to connecting to host UDS managed outside
// the sandbox / test.
//
// A set of ultity sockets will be created externally in $TEST_UDS_TREE and
// $TEST_UDS_ATTACH_TREE for these tests to interact with.
namespace gvisor {
namespace testing {
namespace {
struct ProtocolSocket {
int protocol;
std::string name;
};
// Parameter is (socket root dir, ProtocolSocket).
using GoferStreamSeqpacketTest =
::testing::TestWithParam<std::tuple<std::string, ProtocolSocket>>;
// Connect to a socket and verify that write/read work.
//
// An "echo" socket doesn't work for dgram sockets because our socket is
// unnamed. The server thus has no way to reply to us.
TEST_P(GoferStreamSeqpacketTest, Echo) {
std::string env;
ProtocolSocket proto;
std::tie(env, proto) = GetParam();
char* val = getenv(env.c_str());
ASSERT_NE(val, nullptr);
std::string root(val);
FileDescriptor sock =
ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_UNIX, proto.protocol, 0));
std::string socket_path = JoinPath(root, proto.name, "echo");
struct sockaddr_un addr = {};
addr.sun_family = AF_UNIX;
memcpy(addr.sun_path, socket_path.c_str(), socket_path.length());
ASSERT_THAT(connect(sock.get(), reinterpret_cast<struct sockaddr*>(&addr),
sizeof(addr)),
SyscallSucceeds());
constexpr int kBufferSize = 64;
char send_buffer[kBufferSize];
memset(send_buffer, 'a', sizeof(send_buffer));
ASSERT_THAT(WriteFd(sock.get(), send_buffer, sizeof(send_buffer)),
SyscallSucceedsWithValue(sizeof(send_buffer)));
char recv_buffer[kBufferSize];
ASSERT_THAT(ReadFd(sock.get(), recv_buffer, sizeof(recv_buffer)),
SyscallSucceedsWithValue(sizeof(recv_buffer)));
ASSERT_EQ(0, memcmp(send_buffer, recv_buffer, sizeof(send_buffer)));
}
// It is not possible to connect to a bound but non-listening socket.
TEST_P(GoferStreamSeqpacketTest, NonListening) {
std::string env;
ProtocolSocket proto;
std::tie(env, proto) = GetParam();
char* val = getenv(env.c_str());
ASSERT_NE(val, nullptr);
std::string root(val);
FileDescriptor sock =
ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_UNIX, proto.protocol, 0));
std::string socket_path = JoinPath(root, proto.name, "nonlistening");
struct sockaddr_un addr = {};
addr.sun_family = AF_UNIX;
memcpy(addr.sun_path, socket_path.c_str(), socket_path.length());
ASSERT_THAT(connect(sock.get(), reinterpret_cast<struct sockaddr*>(&addr),
sizeof(addr)),
SyscallFailsWithErrno(ECONNREFUSED));
}
INSTANTIATE_TEST_SUITE_P(
StreamSeqpacket, GoferStreamSeqpacketTest,
::testing::Combine(
// Test access via standard path and attach point.
::testing::Values("TEST_UDS_TREE", "TEST_UDS_ATTACH_TREE"),
::testing::Values(ProtocolSocket{SOCK_STREAM, "stream"},
ProtocolSocket{SOCK_SEQPACKET, "seqpacket"})));
// Parameter is socket root dir.
using GoferDgramTest = ::testing::TestWithParam<std::string>;
// Connect to a socket and verify that write works.
//
// An "echo" socket doesn't work for dgram sockets because our socket is
// unnamed. The server thus has no way to reply to us.
TEST_P(GoferDgramTest, Null) {
std::string env = GetParam();
char* val = getenv(env.c_str());
ASSERT_NE(val, nullptr);
std::string root(val);
FileDescriptor sock =
ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_UNIX, SOCK_DGRAM, 0));
std::string socket_path = JoinPath(root, "dgram/null");
struct sockaddr_un addr = {};
addr.sun_family = AF_UNIX;
memcpy(addr.sun_path, socket_path.c_str(), socket_path.length());
ASSERT_THAT(connect(sock.get(), reinterpret_cast<struct sockaddr*>(&addr),
sizeof(addr)),
SyscallSucceeds());
constexpr int kBufferSize = 64;
char send_buffer[kBufferSize];
memset(send_buffer, 'a', sizeof(send_buffer));
ASSERT_THAT(WriteFd(sock.get(), send_buffer, sizeof(send_buffer)),
SyscallSucceedsWithValue(sizeof(send_buffer)));
}
INSTANTIATE_TEST_SUITE_P(Dgram, GoferDgramTest,
// Test access via standard path and attach point.
::testing::Values("TEST_UDS_TREE",
"TEST_UDS_ATTACH_TREE"));
} // namespace
} // namespace testing
} // namespace gvisor
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