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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 <poll.h>
#include <stdio.h>
#include <sys/un.h>
#include "gtest/gtest.h"
#include "absl/time/clock.h"
#include "absl/time/time.h"
#include "test/syscalls/linux/unix_domain_socket_test_util.h"
#include "test/util/socket_util.h"
#include "test/util/test_util.h"
namespace gvisor {
namespace testing {
namespace {
// Test fixture for tests that apply to pairs of connected stream unix sockets.
using StreamUnixSocketPairTest = SocketPairTest;
TEST_P(StreamUnixSocketPairTest, WriteOneSideClosed) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(close(sockets->release_first_fd()), SyscallSucceeds());
constexpr char kStr[] = "abc";
ASSERT_THAT(write(sockets->second_fd(), kStr, 3),
SyscallFailsWithErrno(EPIPE));
}
TEST_P(StreamUnixSocketPairTest, ReadOneSideClosed) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
ASSERT_THAT(close(sockets->release_first_fd()), SyscallSucceeds());
char data[10] = {};
ASSERT_THAT(read(sockets->second_fd(), data, sizeof(data)),
SyscallSucceedsWithValue(0));
}
TEST_P(StreamUnixSocketPairTest, RecvmsgOneSideClosed) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
// Set timeout so that it will not wait for ever.
struct timeval tv {
.tv_sec = 0, .tv_usec = 10
};
EXPECT_THAT(setsockopt(sockets->second_fd(), SOL_SOCKET, SO_RCVTIMEO, &tv,
sizeof(tv)),
SyscallSucceeds());
ASSERT_THAT(close(sockets->release_first_fd()), SyscallSucceeds());
char received_data[10] = {};
struct iovec iov;
iov.iov_base = received_data;
iov.iov_len = sizeof(received_data);
struct msghdr msg = {};
msg.msg_flags = -1;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
ASSERT_THAT(recvmsg(sockets->second_fd(), &msg, MSG_WAITALL),
SyscallSucceedsWithValue(0));
}
TEST_P(StreamUnixSocketPairTest, ReadOneSideClosedWithUnreadData) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
char buf[10] = {};
ASSERT_THAT(RetryEINTR(write)(sockets->second_fd(), buf, sizeof(buf)),
SyscallSucceedsWithValue(sizeof(buf)));
ASSERT_THAT(shutdown(sockets->first_fd(), SHUT_RDWR), SyscallSucceeds());
ASSERT_THAT(RetryEINTR(read)(sockets->second_fd(), buf, sizeof(buf)),
SyscallSucceedsWithValue(0));
ASSERT_THAT(close(sockets->release_first_fd()), SyscallSucceeds());
ASSERT_THAT(RetryEINTR(read)(sockets->second_fd(), buf, sizeof(buf)),
SyscallFailsWithErrno(ECONNRESET));
}
TEST_P(StreamUnixSocketPairTest, Sendto) {
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));
constexpr char kStr[] = "abc";
ASSERT_THAT(sendto(sockets->second_fd(), kStr, 3, 0, (struct sockaddr*)&addr,
sizeof(addr)),
SyscallFailsWithErrno(EISCONN));
}
TEST_P(StreamUnixSocketPairTest, SetAndGetSocketLinger) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
struct linger sl = {1, 5};
EXPECT_THAT(
setsockopt(sockets->first_fd(), SOL_SOCKET, SO_LINGER, &sl, sizeof(sl)),
SyscallSucceedsWithValue(0));
struct linger got_linger = {};
socklen_t length = sizeof(sl);
EXPECT_THAT(getsockopt(sockets->first_fd(), SOL_SOCKET, SO_LINGER,
&got_linger, &length),
SyscallSucceedsWithValue(0));
ASSERT_EQ(length, sizeof(got_linger));
EXPECT_EQ(0, memcmp(&got_linger, &sl, length));
}
TEST_P(StreamUnixSocketPairTest, GetSocketAcceptConn) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
int got = -1;
socklen_t length = sizeof(got);
ASSERT_THAT(
getsockopt(sockets->first_fd(), SOL_SOCKET, SO_ACCEPTCONN, &got, &length),
SyscallSucceedsWithValue(0));
ASSERT_EQ(length, sizeof(got));
EXPECT_EQ(got, 0);
}
TEST_P(StreamUnixSocketPairTest, SetSocketSendBuf) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
auto s = sockets->first_fd();
int max = 0;
int min = 0;
{
// Discover maxmimum buffer size by setting to a really large value.
constexpr int kRcvBufSz = INT_MAX;
ASSERT_THAT(
setsockopt(s, SOL_SOCKET, SO_SNDBUF, &kRcvBufSz, sizeof(kRcvBufSz)),
SyscallSucceeds());
max = 0;
socklen_t max_len = sizeof(max);
ASSERT_THAT(getsockopt(s, SOL_SOCKET, SO_SNDBUF, &max, &max_len),
SyscallSucceeds());
}
{
// Discover minimum buffer size by setting it to zero.
constexpr int kRcvBufSz = 0;
ASSERT_THAT(
setsockopt(s, SOL_SOCKET, SO_SNDBUF, &kRcvBufSz, sizeof(kRcvBufSz)),
SyscallSucceeds());
socklen_t min_len = sizeof(min);
ASSERT_THAT(getsockopt(s, SOL_SOCKET, SO_SNDBUF, &min, &min_len),
SyscallSucceeds());
}
int quarter_sz = min + (max - min) / 4;
ASSERT_THAT(
setsockopt(s, SOL_SOCKET, SO_SNDBUF, &quarter_sz, sizeof(quarter_sz)),
SyscallSucceeds());
int val = 0;
socklen_t val_len = sizeof(val);
ASSERT_THAT(getsockopt(s, SOL_SOCKET, SO_SNDBUF, &val, &val_len),
SyscallSucceeds());
// Linux doubles the value set by SO_SNDBUF/SO_SNDBUF.
quarter_sz *= 2;
ASSERT_EQ(quarter_sz, val);
}
TEST_P(StreamUnixSocketPairTest, SendBufferOverflow) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
auto s = sockets->first_fd();
constexpr int kBufSz = 4096;
std::vector<char> buf(kBufSz * 4);
ASSERT_THAT(RetryEINTR(send)(s, buf.data(), buf.size(), MSG_DONTWAIT),
SyscallSucceeds());
// The new buffer size should be smaller that the amount of data in the queue.
ASSERT_THAT(setsockopt(s, SOL_SOCKET, SO_SNDBUF, &kBufSz, sizeof(kBufSz)),
SyscallSucceeds());
ASSERT_THAT(RetryEINTR(send)(s, buf.data(), buf.size(), MSG_DONTWAIT),
SyscallFailsWithErrno(EAGAIN));
}
TEST_P(StreamUnixSocketPairTest, IncreasedSocketSendBufUnblocksWrites) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
int sock = sockets->first_fd();
int buf_size = 0;
socklen_t buf_size_len = sizeof(buf_size);
ASSERT_THAT(getsockopt(sock, SOL_SOCKET, SO_SNDBUF, &buf_size, &buf_size_len),
SyscallSucceeds());
int opts;
ASSERT_THAT(opts = fcntl(sock, F_GETFL), SyscallSucceeds());
opts |= O_NONBLOCK;
ASSERT_THAT(fcntl(sock, F_SETFL, opts), SyscallSucceeds());
std::vector<char> buf(buf_size / 4);
// Write till the socket buffer is full.
while (RetryEINTR(send)(sock, buf.data(), buf.size(), 0) != -1) {
// Sleep to give linux a chance to move data from the send buffer to the
// receive buffer.
absl::SleepFor(absl::Milliseconds(10)); // 10ms.
}
// The last error should have been EWOULDBLOCK.
ASSERT_EQ(errno, EWOULDBLOCK);
// Now increase the socket send buffer.
buf_size = buf_size * 2;
ASSERT_THAT(
setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &buf_size, sizeof(buf_size)),
SyscallSucceeds());
// The send should succeed again.
ASSERT_THAT(RetryEINTR(send)(sock, buf.data(), buf.size(), 0),
SyscallSucceeds());
}
INSTANTIATE_TEST_SUITE_P(
AllUnixDomainSockets, StreamUnixSocketPairTest,
::testing::ValuesIn(IncludeReversals(VecCat<SocketPairKind>(
ApplyVec<SocketPairKind>(UnixDomainSocketPair,
AllBitwiseCombinations(List<int>{SOCK_STREAM},
List<int>{
0, SOCK_NONBLOCK})),
ApplyVec<SocketPairKind>(FilesystemBoundUnixDomainSocketPair,
AllBitwiseCombinations(List<int>{SOCK_STREAM},
List<int>{
0, SOCK_NONBLOCK})),
ApplyVec<SocketPairKind>(
AbstractBoundUnixDomainSocketPair,
AllBitwiseCombinations(List<int>{SOCK_STREAM},
List<int>{0, SOCK_NONBLOCK}))))));
} // namespace
} // namespace testing
} // namespace gvisor
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