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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 "test/syscalls/linux/socket_stream_blocking.h"
#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.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"
#include "test/util/thread_util.h"
#include "test/util/timer_util.h"
namespace gvisor {
namespace testing {
TEST_P(BlockingStreamSocketPairTest, BlockPartialWriteClosed) {
// FIXME(b/35921550): gVisor doesn't support SO_SNDBUF on UDS, nor does it
// enforce any limit; it will write arbitrary amounts of data without
// blocking.
SKIP_IF(IsRunningOnGvisor());
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
int buffer_size;
socklen_t length = sizeof(buffer_size);
ASSERT_THAT(getsockopt(sockets->first_fd(), SOL_SOCKET, SO_SNDBUF,
&buffer_size, &length),
SyscallSucceeds());
int wfd = sockets->first_fd();
ScopedThread t([wfd, buffer_size]() {
std::vector<char> buf(2 * buffer_size);
// Write more than fits in the buffer. Blocks then returns partial write
// when the other end is closed. The next call returns EPIPE.
//
// N.B. writes occur in chunks, so we may see less than buffer_size from
// the first call.
ASSERT_THAT(write(wfd, buf.data(), buf.size()),
SyscallSucceedsWithValue(::testing::Gt(0)));
ASSERT_THAT(write(wfd, buf.data(), buf.size()),
::testing::AnyOf(SyscallFailsWithErrno(EPIPE),
SyscallFailsWithErrno(ECONNRESET)));
});
// Leave time for write to become blocked.
absl::SleepFor(absl::Seconds(1));
ASSERT_THAT(close(sockets->release_second_fd()), SyscallSucceeds());
}
// Random save may interrupt the call to sendmsg() in SendLargeSendMsg(),
// causing the write to be incomplete and the test to hang.
TEST_P(BlockingStreamSocketPairTest, SendMsgTooLarge) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
int sndbuf;
socklen_t length = sizeof(sndbuf);
ASSERT_THAT(
getsockopt(sockets->first_fd(), SOL_SOCKET, SO_SNDBUF, &sndbuf, &length),
SyscallSucceeds());
// Make the call too large to fit in the send buffer.
const int buffer_size = 3 * sndbuf;
EXPECT_THAT(SendLargeSendMsg(sockets, buffer_size, true /* reader */),
SyscallSucceedsWithValue(buffer_size));
}
TEST_P(BlockingStreamSocketPairTest, RecvLessThanBuffer) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
char sent_data[100];
RandomizeBuffer(sent_data, sizeof(sent_data));
ASSERT_THAT(write(sockets->first_fd(), sent_data, sizeof(sent_data)),
SyscallSucceedsWithValue(sizeof(sent_data)));
char received_data[200] = {};
ASSERT_THAT(RetryEINTR(recv)(sockets->second_fd(), received_data,
sizeof(received_data), 0),
SyscallSucceedsWithValue(sizeof(sent_data)));
}
// Test that MSG_WAITALL causes recv to block until all requested data is
// received. Random save can interrupt blocking and cause received data to be
// returned, even if the amount received is less than the full requested amount.
TEST_P(BlockingStreamSocketPairTest, RecvLessThanBufferWaitAll) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
char sent_data[100];
RandomizeBuffer(sent_data, sizeof(sent_data));
ASSERT_THAT(write(sockets->first_fd(), sent_data, sizeof(sent_data)),
SyscallSucceedsWithValue(sizeof(sent_data)));
constexpr auto kDuration = absl::Milliseconds(200);
auto before = Now(CLOCK_MONOTONIC);
const ScopedThread t([&]() {
absl::SleepFor(kDuration);
// Don't let saving after the write interrupt the blocking recv.
const DisableSave ds;
ASSERT_THAT(write(sockets->first_fd(), sent_data, sizeof(sent_data)),
SyscallSucceedsWithValue(sizeof(sent_data)));
});
char received_data[sizeof(sent_data) * 2] = {};
ASSERT_THAT(RetryEINTR(recv)(sockets->second_fd(), received_data,
sizeof(received_data), MSG_WAITALL),
SyscallSucceedsWithValue(sizeof(received_data)));
auto after = Now(CLOCK_MONOTONIC);
EXPECT_GE(after - before, kDuration);
}
TEST_P(BlockingStreamSocketPairTest, SendTimeout) {
auto sockets = ASSERT_NO_ERRNO_AND_VALUE(NewSocketPair());
struct timeval tv {
.tv_sec = 0, .tv_usec = 10
};
EXPECT_THAT(
setsockopt(sockets->first_fd(), SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)),
SyscallSucceeds());
std::vector<char> buf(kPageSize);
// We don't know how much data the socketpair will buffer, so we may do an
// arbitrarily large number of writes; saving after each write causes this
// test's time to explode.
const DisableSave ds;
for (;;) {
int ret;
ASSERT_THAT(
ret = RetryEINTR(send)(sockets->first_fd(), buf.data(), buf.size(), 0),
::testing::AnyOf(SyscallSucceeds(), SyscallFailsWithErrno(EAGAIN)));
if (ret == -1) {
break;
}
}
}
} // namespace testing
} // namespace gvisor
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