// 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/socket_test_util.h" #include "test/syscalls/linux/unix_domain_socket_test_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_NoRandomSave) { 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_NoRandomSave) { 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