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gvisor/test/syscalls/linux/accept_bind.cc

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// Copyright 2018 Google LLC
//
// 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 <stdio.h>
#include <sys/un.h>
#include <algorithm>
#include <vector>
#include "gtest/gtest.h"
#include "gtest/gtest.h"
#include "test/syscalls/linux/socket_test_util.h"
#include "test/syscalls/linux/unix_domain_socket_test_util.h"
#include "test/util/file_descriptor.h"
#include "test/util/test_util.h"
namespace gvisor {
namespace testing {
namespace {
TEST_P(AllSocketPairTest, Listen) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), /* backlog = */ 5),
SyscallSucceeds());
}
TEST_P(AllSocketPairTest, ListenIncreaseBacklog) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), /* backlog = */ 5),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), /* backlog = */ 10),
SyscallSucceeds());
}
TEST_P(AllSocketPairTest, ListenDecreaseBacklog) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), /* backlog = */ 5),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), /* backlog = */ 1),
SyscallSucceeds());
}
TEST_P(AllSocketPairTest, ListenWithoutBind) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(listen(sockets->first_fd(), 0), SyscallFailsWithErrno(EINVAL));
}
TEST_P(AllSocketPairTest, DoubleBind) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(bind(sockets->first_fd(), sockets->second_addr(),
sockets->second_addr_size()),
SyscallFailsWithErrno(EINVAL));
}
TEST_P(AllSocketPairTest, BindListenBind) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), 5), SyscallSucceeds());
ASSERT_THAT(bind(sockets->first_fd(), sockets->second_addr(),
sockets->second_addr_size()),
SyscallFailsWithErrno(EINVAL));
}
TEST_P(AllSocketPairTest, DoubleListen) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), 5), SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), 5), SyscallSucceeds());
}
TEST_P(AllSocketPairTest, DoubleConnect) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), 5), SyscallSucceeds());
ASSERT_THAT(connect(sockets->second_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(connect(sockets->second_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallFailsWithErrno(EISCONN));
}
TEST_P(AllSocketPairTest, Connect) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), 5), SyscallSucceeds());
ASSERT_THAT(connect(sockets->second_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
}
TEST_P(AllSocketPairTest, ConnectToFilePath) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
struct sockaddr_un addr = {};
addr.sun_family = AF_UNIX;
constexpr char kPath[] = "/tmp";
memcpy(addr.sun_path, kPath, sizeof(kPath));
ASSERT_THAT(
connect(sockets->second_fd(),
reinterpret_cast<const struct sockaddr*>(&addr), sizeof(addr)),
SyscallFailsWithErrno(ECONNREFUSED));
}
TEST_P(AllSocketPairTest, ConnectToInvalidAbstractPath) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
struct sockaddr_un addr = {};
addr.sun_family = AF_UNIX;
constexpr char kPath[] = "\0nonexistent";
memcpy(addr.sun_path, kPath, sizeof(kPath));
ASSERT_THAT(
connect(sockets->second_fd(),
reinterpret_cast<const struct sockaddr*>(&addr), sizeof(addr)),
SyscallFailsWithErrno(ECONNREFUSED));
}
TEST_P(AllSocketPairTest, SelfConnect) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), 5), SyscallSucceeds());
ASSERT_THAT(connect(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallFailsWithErrno(EINVAL));
}
TEST_P(AllSocketPairTest, ConnectWithoutListen) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(connect(sockets->second_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallFailsWithErrno(ECONNREFUSED));
}
TEST_P(AllSocketPairTest, Accept) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), 5), SyscallSucceeds());
ASSERT_THAT(connect(sockets->second_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
int accepted = -1;
ASSERT_THAT(accepted = accept(sockets->first_fd(), nullptr, nullptr),
SyscallSucceeds());
ASSERT_THAT(close(accepted), SyscallSucceeds());
}
TEST_P(AllSocketPairTest, AcceptValidAddrLen) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), 5), SyscallSucceeds());
ASSERT_THAT(connect(sockets->second_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
int accepted = -1;
struct sockaddr_un addr = {};
socklen_t addr_len = sizeof(addr);
ASSERT_THAT(
accepted = accept(sockets->first_fd(),
reinterpret_cast<struct sockaddr*>(&addr), &addr_len),
SyscallSucceeds());
ASSERT_THAT(close(accepted), SyscallSucceeds());
}
TEST_P(AllSocketPairTest, AcceptNegativeAddrLen) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), 5), SyscallSucceeds());
ASSERT_THAT(connect(sockets->second_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
// With a negative addr_len, accept returns EINVAL,
struct sockaddr_un addr = {};
socklen_t addr_len = -1;
ASSERT_THAT(accept(sockets->first_fd(),
reinterpret_cast<struct sockaddr*>(&addr), &addr_len),
SyscallFailsWithErrno(EINVAL));
}
TEST_P(AllSocketPairTest, AcceptLargePositiveAddrLen) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), 5), SyscallSucceeds());
ASSERT_THAT(connect(sockets->second_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
// With a large (positive) addr_len, accept does not return EINVAL.
int accepted = -1;
char addr_buf[200];
socklen_t addr_len = sizeof(addr_buf);
ASSERT_THAT(accepted = accept(sockets->first_fd(),
reinterpret_cast<struct sockaddr*>(addr_buf),
&addr_len),
SyscallSucceeds());
// addr_len should have been updated by accept().
EXPECT_LT(addr_len, sizeof(addr_buf));
ASSERT_THAT(close(accepted), SyscallSucceeds());
}
TEST_P(AllSocketPairTest, AcceptVeryLargePositiveAddrLen) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), 5), SyscallSucceeds());
ASSERT_THAT(connect(sockets->second_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
// With a large (positive) addr_len, accept does not return EINVAL.
int accepted = -1;
char addr_buf[2000];
socklen_t addr_len = sizeof(addr_buf);
ASSERT_THAT(accepted = accept(sockets->first_fd(),
reinterpret_cast<struct sockaddr*>(addr_buf),
&addr_len),
SyscallSucceeds());
// addr_len should have been updated by accept().
EXPECT_LT(addr_len, sizeof(addr_buf));
ASSERT_THAT(close(accepted), SyscallSucceeds());
}
TEST_P(AllSocketPairTest, AcceptWithoutBind) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(accept(sockets->first_fd(), nullptr, nullptr),
SyscallFailsWithErrno(EINVAL));
}
TEST_P(AllSocketPairTest, AcceptWithoutListen) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(accept(sockets->first_fd(), nullptr, nullptr),
SyscallFailsWithErrno(EINVAL));
}
TEST_P(AllSocketPairTest, GetRemoteAddress) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), 5), SyscallSucceeds());
ASSERT_THAT(connect(sockets->second_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
socklen_t addr_len = sockets->first_addr_size();
struct sockaddr_storage addr = {};
ASSERT_THAT(
getpeername(sockets->second_fd(), (struct sockaddr*)(&addr), &addr_len),
SyscallSucceeds());
EXPECT_EQ(addr_len, sockets->first_addr_len());
EXPECT_EQ(0, memcmp(&addr, sockets->first_addr(), sockets->first_addr_len()));
}
TEST_P(AllSocketPairTest, UnboundGetLocalAddress) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), 5), SyscallSucceeds());
ASSERT_THAT(connect(sockets->second_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
socklen_t addr_len = sockets->first_addr_size();
struct sockaddr_storage addr = {};
ASSERT_THAT(
getsockname(sockets->second_fd(), (struct sockaddr*)(&addr), &addr_len),
SyscallSucceeds());
EXPECT_EQ(addr_len, 2);
EXPECT_EQ(
memcmp(&addr, sockets->second_addr(),
std::min((size_t)addr_len, (size_t)sockets->second_addr_len())),
0);
}
TEST_P(AllSocketPairTest, BoundGetLocalAddress) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), 5), SyscallSucceeds());
ASSERT_THAT(bind(sockets->second_fd(), sockets->second_addr(),
sockets->second_addr_size()),
SyscallSucceeds());
ASSERT_THAT(connect(sockets->second_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
socklen_t addr_len = sockets->first_addr_size();
struct sockaddr_storage addr = {};
ASSERT_THAT(
getsockname(sockets->second_fd(), (struct sockaddr*)(&addr), &addr_len),
SyscallSucceeds());
EXPECT_EQ(addr_len, sockets->second_addr_len());
EXPECT_EQ(
memcmp(&addr, sockets->second_addr(),
std::min((size_t)addr_len, (size_t)sockets->second_addr_len())),
0);
}
TEST_P(AllSocketPairTest, BoundConnector) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), 5), SyscallSucceeds());
ASSERT_THAT(bind(sockets->second_fd(), sockets->second_addr(),
sockets->second_addr_size()),
SyscallSucceeds());
ASSERT_THAT(connect(sockets->second_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
}
TEST_P(AllSocketPairTest, UnboundSenderAddr) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), 5), SyscallSucceeds());
ASSERT_THAT(connect(sockets->second_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
int accepted = -1;
ASSERT_THAT(accepted = accept(sockets->first_fd(), nullptr, nullptr),
SyscallSucceeds());
FileDescriptor accepted_fd(accepted);
int i = 0;
ASSERT_THAT(RetryEINTR(send)(sockets->second_fd(), &i, sizeof(i), 0),
SyscallSucceedsWithValue(sizeof(i)));
struct sockaddr_storage addr;
socklen_t addr_len = sizeof(addr);
ASSERT_THAT(
RetryEINTR(recvfrom)(accepted_fd.get(), &i, sizeof(i), 0,
reinterpret_cast<sockaddr*>(&addr), &addr_len),
SyscallSucceedsWithValue(sizeof(i)));
if (!IsRunningOnGvisor()) {
// Linux returns a zero length for addresses from recvfrom(2) and
// recvmsg(2). This differs from the behavior of getpeername(2) and
// getsockname(2). For simplicity, we use the getpeername(2) and
// getsockname(2) behavior for recvfrom(2) and recvmsg(2).
EXPECT_EQ(addr_len, 0);
return;
}
EXPECT_EQ(addr_len, 2);
EXPECT_EQ(
memcmp(&addr, sockets->second_addr(),
std::min((size_t)addr_len, (size_t)sockets->second_addr_len())),
0);
}
TEST_P(AllSocketPairTest, BoundSenderAddr) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), 5), SyscallSucceeds());
ASSERT_THAT(bind(sockets->second_fd(), sockets->second_addr(),
sockets->second_addr_size()),
SyscallSucceeds());
ASSERT_THAT(connect(sockets->second_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
int accepted = -1;
ASSERT_THAT(accepted = accept(sockets->first_fd(), nullptr, nullptr),
SyscallSucceeds());
FileDescriptor accepted_fd(accepted);
int i = 0;
ASSERT_THAT(RetryEINTR(send)(sockets->second_fd(), &i, sizeof(i), 0),
SyscallSucceedsWithValue(sizeof(i)));
struct sockaddr_storage addr;
socklen_t addr_len = sizeof(addr);
ASSERT_THAT(
RetryEINTR(recvfrom)(accepted_fd.get(), &i, sizeof(i), 0,
reinterpret_cast<sockaddr*>(&addr), &addr_len),
SyscallSucceedsWithValue(sizeof(i)));
EXPECT_EQ(addr_len, sockets->second_addr_len());
EXPECT_EQ(
memcmp(&addr, sockets->second_addr(),
std::min((size_t)addr_len, (size_t)sockets->second_addr_len())),
0);
}
TEST_P(AllSocketPairTest, BindAfterConnectSenderAddr) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), 5), SyscallSucceeds());
ASSERT_THAT(connect(sockets->second_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(bind(sockets->second_fd(), sockets->second_addr(),
sockets->second_addr_size()),
SyscallSucceeds());
int accepted = -1;
ASSERT_THAT(accepted = accept(sockets->first_fd(), nullptr, nullptr),
SyscallSucceeds());
FileDescriptor accepted_fd(accepted);
int i = 0;
ASSERT_THAT(RetryEINTR(send)(sockets->second_fd(), &i, sizeof(i), 0),
SyscallSucceedsWithValue(sizeof(i)));
struct sockaddr_storage addr;
socklen_t addr_len = sizeof(addr);
ASSERT_THAT(
RetryEINTR(recvfrom)(accepted_fd.get(), &i, sizeof(i), 0,
reinterpret_cast<sockaddr*>(&addr), &addr_len),
SyscallSucceedsWithValue(sizeof(i)));
EXPECT_EQ(addr_len, sockets->second_addr_len());
EXPECT_EQ(
memcmp(&addr, sockets->second_addr(),
std::min((size_t)addr_len, (size_t)sockets->second_addr_len())),
0);
}
TEST_P(AllSocketPairTest, BindAfterAcceptSenderAddr) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(bind(sockets->first_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
ASSERT_THAT(listen(sockets->first_fd(), 5), SyscallSucceeds());
ASSERT_THAT(connect(sockets->second_fd(), sockets->first_addr(),
sockets->first_addr_size()),
SyscallSucceeds());
int accepted = -1;
ASSERT_THAT(accepted = accept(sockets->first_fd(), nullptr, nullptr),
SyscallSucceeds());
FileDescriptor accepted_fd(accepted);
ASSERT_THAT(bind(sockets->second_fd(), sockets->second_addr(),
sockets->second_addr_size()),
SyscallSucceeds());
int i = 0;
ASSERT_THAT(RetryEINTR(send)(sockets->second_fd(), &i, sizeof(i), 0),
SyscallSucceedsWithValue(sizeof(i)));
struct sockaddr_storage addr;
socklen_t addr_len = sizeof(addr);
ASSERT_THAT(
RetryEINTR(recvfrom)(accepted_fd.get(), &i, sizeof(i), 0,
reinterpret_cast<sockaddr*>(&addr), &addr_len),
SyscallSucceedsWithValue(sizeof(i)));
EXPECT_EQ(addr_len, sockets->second_addr_len());
EXPECT_EQ(
memcmp(&addr, sockets->second_addr(),
std::min((size_t)addr_len, (size_t)sockets->second_addr_len())),
0);
}
INSTANTIATE_TEST_SUITE_P(
AllUnixDomainSockets, AllSocketPairTest,
::testing::ValuesIn(VecCat<SocketPairKind>(
ApplyVec<SocketPairKind>(
FilesystemUnboundUnixDomainSocketPair,
AllBitwiseCombinations(List<int>{SOCK_STREAM, SOCK_SEQPACKET},
List<int>{0, SOCK_NONBLOCK})),
ApplyVec<SocketPairKind>(
AbstractUnboundUnixDomainSocketPair,
AllBitwiseCombinations(List<int>{SOCK_STREAM, SOCK_SEQPACKET},
List<int>{0, SOCK_NONBLOCK})))));
} // namespace
} // namespace testing
} // namespace gvisor
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