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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_unix_seqpacket.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_P(SeqpacketUnixSocketPairTest, 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(SeqpacketUnixSocketPairTest, 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(SeqpacketUnixSocketPairTest, 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)),
SyscallSucceedsWithValue(3));
char data[10] = {};
ASSERT_THAT(read(sockets->first_fd(), data, sizeof(data)),
SyscallSucceedsWithValue(3));
}
TEST_P(SeqpacketUnixSocketPairTest, 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());
// Skip test if the setsockopt didn't increase the sendbuf. This happens for
// tests where the socket is a host fd where gVisor does not permit increasing
// send buffer size.
int new_buf_size = 0;
buf_size_len = sizeof(new_buf_size);
ASSERT_THAT(
getsockopt(sock, SOL_SOCKET, SO_SNDBUF, &new_buf_size, &buf_size_len),
SyscallSucceeds());
if (IsRunningOnGvisor() && (new_buf_size <= buf_size)) {
GTEST_SKIP() << "Skipping test new send buffer size " << new_buf_size
<< " is the same as the value before setsockopt, "
<< " socket is probably a host backed socket." << std ::endl;
}
// send should succeed again.
ASSERT_THAT(RetryEINTR(send)(sock, buf.data(), buf.size(), 0),
SyscallSucceeds());
}
} // namespace
} // namespace testing
} // namespace gvisor
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