// 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 <arpa/inet.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <poll.h>
#include <string.h>
#include <sys/socket.h>
#include <atomic>
#include <iostream>
#include <memory>
#include <string>
#include <tuple>
#include <utility>
#include <vector>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/memory/memory.h"
#include "absl/strings/str_cat.h"
#include "absl/time/clock.h"
#include "absl/time/time.h"
#include "test/syscalls/linux/ip_socket_test_util.h"
#include "test/syscalls/linux/socket_inet_loopback_test_params.h"
#include "test/util/file_descriptor.h"
#include "test/util/posix_error.h"
#include "test/util/save_util.h"
#include "test/util/socket_util.h"
#include "test/util/test_util.h"
#include "test/util/thread_util.h"
namespace gvisor {
namespace testing {
namespace {
using ::testing::Gt;
using SocketInetLoopbackTest = ::testing::TestWithParam<SocketInetTestParam>;
TEST(BadSocketPairArgs, ValidateErrForBadCallsToSocketPair) {
int fd[2] = {};
// Valid AF but invalid for socketpair(2) return ESOCKTNOSUPPORT.
ASSERT_THAT(socketpair(AF_INET, 0, 0, fd),
SyscallFailsWithErrno(ESOCKTNOSUPPORT));
ASSERT_THAT(socketpair(AF_INET6, 0, 0, fd),
SyscallFailsWithErrno(ESOCKTNOSUPPORT));
// Invalid AF will fail.
ASSERT_THAT(socketpair(AF_MAX, 0, 0, fd), SyscallFails());
ASSERT_THAT(socketpair(8675309, 0, 0, fd), SyscallFails());
}
enum class Operation {
Bind,
Connect,
SendTo,
};
std::string OperationToString(Operation operation) {
switch (operation) {
case Operation::Bind:
return "Bind";
case Operation::Connect:
return "Connect";
// Operation::SendTo is the default.
default:
return "SendTo";
}
}
using OperationSequence = std::vector<Operation>;
using DualStackSocketTest =
::testing::TestWithParam<std::tuple<TestAddress, OperationSequence>>;
TEST_P(DualStackSocketTest, AddressOperations) {
const FileDescriptor fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(AF_INET6, SOCK_DGRAM, 0));
const TestAddress& addr = std::get<0>(GetParam());
const OperationSequence& operations = std::get<1>(GetParam());
auto addr_in = reinterpret_cast<const sockaddr*>(&addr.addr);
// sockets may only be bound once. Both `connect` and `sendto` cause a socket
// to be bound.
bool bound = false;
for (const Operation& operation : operations) {
bool sockname = false;
bool peername = false;
switch (operation) {
case Operation::Bind: {
ASSERT_NO_ERRNO(SetAddrPort(
addr.family(), const_cast<sockaddr_storage*>(&addr.addr), 0));
int bind_ret = bind(fd.get(), addr_in, addr.addr_len);
// Dual stack sockets may only be bound to AF_INET6.
if (!bound && addr.family() == AF_INET6) {
EXPECT_THAT(bind_ret, SyscallSucceeds());
bound = true;
sockname = true;
} else {
EXPECT_THAT(bind_ret, SyscallFailsWithErrno(EINVAL));
}
break;
}
case Operation::Connect: {
ASSERT_NO_ERRNO(SetAddrPort(
addr.family(), const_cast<sockaddr_storage*>(&addr.addr), 1337));
EXPECT_THAT(RetryEINTR(connect)(fd.get(), addr_in, addr.addr_len),
SyscallSucceeds())
<< GetAddrStr(addr_in);
bound = true;
sockname = true;
peername = true;
break;
}
case Operation::SendTo: {
const char payload[] = "hello";
ASSERT_NO_ERRNO(SetAddrPort(
addr.family(), const_cast<sockaddr_storage*>(&addr.addr), 1337));
ssize_t sendto_ret = sendto(fd.get(), &payload, sizeof(payload), 0,
addr_in, addr.addr_len);
EXPECT_THAT(sendto_ret, SyscallSucceedsWithValue(sizeof(payload)));
sockname = !bound;
bound = true;
break;
}
}
if (sockname) {
sockaddr_storage sock_addr;
socklen_t addrlen = sizeof(sock_addr);
ASSERT_THAT(getsockname(fd.get(), AsSockAddr(&sock_addr), &addrlen),
SyscallSucceeds());
ASSERT_EQ(addrlen, sizeof(struct sockaddr_in6));
auto sock_addr_in6 = reinterpret_cast<const sockaddr_in6*>(&sock_addr);
if (operation == Operation::SendTo) {
EXPECT_EQ(sock_addr_in6->sin6_family, AF_INET6);
EXPECT_TRUE(IN6_IS_ADDR_UNSPECIFIED(sock_addr_in6->sin6_addr.s6_addr32))
<< OperationToString(operation)
<< " getsocknam=" << GetAddrStr(AsSockAddr(&sock_addr));
EXPECT_NE(sock_addr_in6->sin6_port, 0);
} else if (IN6_IS_ADDR_V4MAPPED(
reinterpret_cast<const sockaddr_in6*>(addr_in)
->sin6_addr.s6_addr32)) {
EXPECT_TRUE(IN6_IS_ADDR_V4MAPPED(sock_addr_in6->sin6_addr.s6_addr32))
<< OperationToString(operation)
<< " getsocknam=" << GetAddrStr(AsSockAddr(&sock_addr));
}
}
if (peername) {
sockaddr_storage peer_addr;
socklen_t addrlen = sizeof(peer_addr);
ASSERT_THAT(getpeername(fd.get(), AsSockAddr(&peer_addr), &addrlen),
SyscallSucceeds());
ASSERT_EQ(addrlen, sizeof(struct sockaddr_in6));
if (addr.family() == AF_INET ||
IN6_IS_ADDR_V4MAPPED(reinterpret_cast<const sockaddr_in6*>(addr_in)
->sin6_addr.s6_addr32)) {
EXPECT_TRUE(IN6_IS_ADDR_V4MAPPED(
reinterpret_cast<const sockaddr_in6*>(&peer_addr)
->sin6_addr.s6_addr32))
<< OperationToString(operation)
<< " getpeername=" << GetAddrStr(AsSockAddr(&peer_addr));
}
}
}
}
// TODO(gvisor.dev/issue/1556): uncomment V4MappedAny.
INSTANTIATE_TEST_SUITE_P(
All, DualStackSocketTest,
::testing::Combine(
::testing::Values(V4Any(), V4Loopback(), /*V4MappedAny(),*/
V4MappedLoopback(), V6Any(), V6Loopback()),
::testing::ValuesIn<OperationSequence>(
{{Operation::Bind, Operation::Connect, Operation::SendTo},
{Operation::Bind, Operation::SendTo, Operation::Connect},
{Operation::Connect, Operation::Bind, Operation::SendTo},
{Operation::Connect, Operation::SendTo, Operation::Bind},
{Operation::SendTo, Operation::Bind, Operation::Connect},
{Operation::SendTo, Operation::Connect, Operation::Bind}})),
[](::testing::TestParamInfo<
std::tuple<TestAddress, OperationSequence>> const& info) {
const TestAddress& addr = std::get<0>(info.param);
const OperationSequence& operations = std::get<1>(info.param);
std::string s = addr.description;
for (const Operation& operation : operations) {
absl::StrAppend(&s, OperationToString(operation));
}
return s;
});
void tcpSimpleConnectTest(TestAddress const& listener,
TestAddress const& connector, bool unbound) {
// Create the listening socket.
const FileDescriptor listen_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(listener.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage listen_addr = listener.addr;
if (!unbound) {
ASSERT_THAT(
bind(listen_fd.get(), AsSockAddr(&listen_addr), listener.addr_len),
SyscallSucceeds());
}
ASSERT_THAT(listen(listen_fd.get(), SOMAXCONN), SyscallSucceeds());
// Get the port bound by the listening socket.
socklen_t addrlen = listener.addr_len;
ASSERT_THAT(getsockname(listen_fd.get(), AsSockAddr(&listen_addr), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(listener.family(), listen_addr));
// Connect to the listening socket.
const FileDescriptor conn_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage conn_addr = connector.addr;
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
ASSERT_THAT(RetryEINTR(connect)(conn_fd.get(), AsSockAddr(&conn_addr),
connector.addr_len),
SyscallSucceeds());
// Accept the connection.
//
// We have to assign a name to the accepted socket, as unamed temporary
// objects are destructed upon full evaluation of the expression it is in,
// potentially causing the connecting socket to fail to shutdown properly.
auto accepted =
ASSERT_NO_ERRNO_AND_VALUE(Accept(listen_fd.get(), nullptr, nullptr));
ASSERT_THAT(shutdown(listen_fd.get(), SHUT_RDWR), SyscallSucceeds());
ASSERT_THAT(shutdown(conn_fd.get(), SHUT_RDWR), SyscallSucceeds());
}
TEST_P(SocketInetLoopbackTest, TCP) {
SocketInetTestParam const& param = GetParam();
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
tcpSimpleConnectTest(listener, connector, true);
}
TEST_P(SocketInetLoopbackTest, TCPListenUnbound) {
SocketInetTestParam const& param = GetParam();
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
tcpSimpleConnectTest(listener, connector, false);
}
TEST_P(SocketInetLoopbackTest, TCPListenShutdownListen) {
SocketInetTestParam const& param = GetParam();
const TestAddress& listener = param.listener;
const TestAddress& connector = param.connector;
constexpr int kBacklog = 5;
// Create the listening socket.
FileDescriptor listen_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(listener.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage listen_addr = listener.addr;
ASSERT_THAT(
bind(listen_fd.get(), AsSockAddr(&listen_addr), listener.addr_len),
SyscallSucceeds());
ASSERT_THAT(listen(listen_fd.get(), kBacklog), SyscallSucceeds());
ASSERT_THAT(shutdown(listen_fd.get(), SHUT_RD), SyscallSucceeds());
ASSERT_THAT(listen(listen_fd.get(), kBacklog), SyscallSucceeds());
// Get the port bound by the listening socket.
socklen_t addrlen = listener.addr_len;
ASSERT_THAT(getsockname(listen_fd.get(), AsSockAddr(&listen_addr), &addrlen),
SyscallSucceeds());
const uint16_t port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(listener.family(), listen_addr));
sockaddr_storage conn_addr = connector.addr;
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
// TODO(b/153489135): Remove Disable save after bug is fixed. S/R test can
// fail because the last socket may not be delivered to the accept queue
// by the time connect returns.
DisableSave ds;
for (int i = 0; i < kBacklog; i++) {
auto client = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM, IPPROTO_TCP));
ASSERT_THAT(RetryEINTR(connect)(client.get(), AsSockAddr(&conn_addr),
connector.addr_len),
SyscallSucceeds());
}
for (int i = 0; i < kBacklog; i++) {
ASSERT_THAT(accept(listen_fd.get(), nullptr, nullptr), SyscallSucceeds());
}
}
TEST_P(SocketInetLoopbackTest, TCPListenShutdown) {
SocketInetTestParam const& param = GetParam();
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
constexpr int kBacklog = 2;
// See the comment in TCPBacklog for why this isn't kBacklog + 1.
constexpr int kFDs = kBacklog;
// Create the listening socket.
FileDescriptor listen_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(listener.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage listen_addr = listener.addr;
ASSERT_THAT(
bind(listen_fd.get(), AsSockAddr(&listen_addr), listener.addr_len),
SyscallSucceeds());
ASSERT_THAT(listen(listen_fd.get(), kBacklog), SyscallSucceeds());
// Get the port bound by the listening socket.
socklen_t addrlen = listener.addr_len;
ASSERT_THAT(getsockname(listen_fd.get(), AsSockAddr(&listen_addr), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(listener.family(), listen_addr));
sockaddr_storage conn_addr = connector.addr;
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
// Shutdown the write of the listener, expect to not have any effect.
ASSERT_THAT(shutdown(listen_fd.get(), SHUT_WR), SyscallSucceeds());
for (int i = 0; i < kFDs; i++) {
auto client = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM, IPPROTO_TCP));
ASSERT_THAT(RetryEINTR(connect)(client.get(), AsSockAddr(&conn_addr),
connector.addr_len),
SyscallSucceeds());
ASSERT_THAT(accept(listen_fd.get(), nullptr, nullptr), SyscallSucceeds());
}
// Shutdown the read of the listener, expect to fail subsequent
// server accepts, binds and client connects.
ASSERT_THAT(shutdown(listen_fd.get(), SHUT_RD), SyscallSucceeds());
ASSERT_THAT(accept(listen_fd.get(), nullptr, nullptr),
SyscallFailsWithErrno(EINVAL));
// Check that shutdown did not release the port.
FileDescriptor new_listen_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(listener.family(), SOCK_STREAM, IPPROTO_TCP));
ASSERT_THAT(
bind(new_listen_fd.get(), AsSockAddr(&listen_addr), listener.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Check that subsequent connection attempts receive a RST.
auto client = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM, IPPROTO_TCP));
for (int i = 0; i < kFDs; i++) {
auto client = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM, IPPROTO_TCP));
ASSERT_THAT(RetryEINTR(connect)(client.get(), AsSockAddr(&conn_addr),
connector.addr_len),
SyscallFailsWithErrno(ECONNREFUSED));
}
}
TEST_P(SocketInetLoopbackTest, TCPListenClose) {
SocketInetTestParam const& param = GetParam();
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
constexpr int kAcceptCount = 2;
constexpr int kBacklog = kAcceptCount + 2;
constexpr int kFDs = kBacklog * 3;
// Create the listening socket.
FileDescriptor listen_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(listener.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage listen_addr = listener.addr;
ASSERT_THAT(
bind(listen_fd.get(), AsSockAddr(&listen_addr), listener.addr_len),
SyscallSucceeds());
ASSERT_THAT(listen(listen_fd.get(), kBacklog), SyscallSucceeds());
// Get the port bound by the listening socket.
socklen_t addrlen = listener.addr_len;
ASSERT_THAT(getsockname(listen_fd.get(), AsSockAddr(&listen_addr), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(listener.family(), listen_addr));
// Connect repeatedly, keeping each connection open. After kBacklog
// connections, we'll start getting EINPROGRESS.
sockaddr_storage conn_addr = connector.addr;
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
std::vector<FileDescriptor> clients;
for (int i = 0; i < kFDs; i++) {
auto client = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP));
int ret = connect(client.get(), AsSockAddr(&conn_addr), connector.addr_len);
if (ret != 0) {
EXPECT_THAT(ret, SyscallFailsWithErrno(EINPROGRESS));
}
clients.push_back(std::move(client));
}
for (int i = 0; i < kAcceptCount; i++) {
auto accepted =
ASSERT_NO_ERRNO_AND_VALUE(Accept(listen_fd.get(), nullptr, nullptr));
}
}
// Test the protocol state information returned by TCPINFO.
TEST_P(SocketInetLoopbackTest, TCPInfoState) {
SocketInetTestParam const& param = GetParam();
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
// Create the listening socket.
FileDescriptor const listen_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(listener.family(), SOCK_STREAM, IPPROTO_TCP));
auto state = [](int fd) -> int {
struct tcp_info opt = {};
socklen_t optLen = sizeof(opt);
EXPECT_THAT(getsockopt(fd, SOL_TCP, TCP_INFO, &opt, &optLen),
SyscallSucceeds());
return opt.tcpi_state;
};
ASSERT_EQ(state(listen_fd.get()), TCP_CLOSE);
sockaddr_storage listen_addr = listener.addr;
ASSERT_THAT(
bind(listen_fd.get(), AsSockAddr(&listen_addr), listener.addr_len),
SyscallSucceeds());
ASSERT_EQ(state(listen_fd.get()), TCP_CLOSE);
ASSERT_THAT(listen(listen_fd.get(), SOMAXCONN), SyscallSucceeds());
ASSERT_EQ(state(listen_fd.get()), TCP_LISTEN);
// Get the port bound by the listening socket.
socklen_t addrlen = listener.addr_len;
ASSERT_THAT(getsockname(listen_fd.get(), AsSockAddr(&listen_addr), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(listener.family(), listen_addr));
// Connect to the listening socket.
FileDescriptor conn_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage conn_addr = connector.addr;
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
ASSERT_EQ(state(conn_fd.get()), TCP_CLOSE);
ASSERT_THAT(RetryEINTR(connect)(conn_fd.get(), AsSockAddr(&conn_addr),
connector.addr_len),
SyscallSucceeds());
ASSERT_EQ(state(conn_fd.get()), TCP_ESTABLISHED);
auto accepted =
ASSERT_NO_ERRNO_AND_VALUE(Accept(listen_fd.get(), nullptr, nullptr));
ASSERT_EQ(state(accepted.get()), TCP_ESTABLISHED);
ASSERT_THAT(close(accepted.release()), SyscallSucceeds());
struct pollfd pfd = {
.fd = conn_fd.get(),
.events = POLLIN | POLLRDHUP,
};
constexpr int kTimeout = 10000;
int n = poll(&pfd, 1, kTimeout);
ASSERT_GE(n, 0) << strerror(errno);
ASSERT_EQ(n, 1);
if (IsRunningOnGvisor() && GvisorPlatform() != Platform::kFuchsia) {
// TODO(gvisor.dev/issue/6015): Notify POLLRDHUP on incoming FIN.
ASSERT_EQ(pfd.revents, POLLIN);
} else {
ASSERT_EQ(pfd.revents, POLLIN | POLLRDHUP);
}
ASSERT_THAT(state(conn_fd.get()), TCP_CLOSE_WAIT);
ASSERT_THAT(close(conn_fd.release()), SyscallSucceeds());
}
void TestHangupDuringConnect(const SocketInetTestParam& param,
void (*hangup)(FileDescriptor&)) {
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
for (int i = 0; i < 100; i++) {
// Create the listening socket.
FileDescriptor listen_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(listener.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage listen_addr = listener.addr;
ASSERT_THAT(bind(listen_fd.get(), reinterpret_cast<sockaddr*>(&listen_addr),
listener.addr_len),
SyscallSucceeds());
ASSERT_THAT(listen(listen_fd.get(), 0), SyscallSucceeds());
// Get the port bound by the listening socket.
socklen_t addrlen = listener.addr_len;
ASSERT_THAT(
getsockname(listen_fd.get(), reinterpret_cast<sockaddr*>(&listen_addr),
&addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(listener.family(), listen_addr));
sockaddr_storage conn_addr = connector.addr;
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
// Connect asynchronously and immediately hang up the listener.
FileDescriptor client = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP));
int ret = connect(client.get(), reinterpret_cast<sockaddr*>(&conn_addr),
connector.addr_len);
if (ret != 0) {
EXPECT_THAT(ret, SyscallFailsWithErrno(EINPROGRESS));
}
hangup(listen_fd);
// Wait for the connection to close.
struct pollfd pfd = {
.fd = client.get(),
};
constexpr int kTimeout = 10000;
int n = poll(&pfd, 1, kTimeout);
ASSERT_GE(n, 0) << strerror(errno);
ASSERT_EQ(n, 1);
ASSERT_EQ(pfd.revents, POLLHUP | POLLERR);
ASSERT_EQ(close(client.release()), 0) << strerror(errno);
}
}
TEST_P(SocketInetLoopbackTest, TCPListenCloseDuringConnect) {
TestHangupDuringConnect(GetParam(), [](FileDescriptor& f) {
ASSERT_THAT(close(f.release()), SyscallSucceeds());
});
}
TEST_P(SocketInetLoopbackTest, TCPListenShutdownDuringConnect) {
TestHangupDuringConnect(GetParam(), [](FileDescriptor& f) {
ASSERT_THAT(shutdown(f.get(), SHUT_RD), SyscallSucceeds());
});
}
void TestListenHangupConnectingRead(const SocketInetTestParam& param,
void (*hangup)(FileDescriptor&)) {
constexpr int kTimeout = 10000;
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
// Create the listening socket.
FileDescriptor listen_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(listener.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage listen_addr = listener.addr;
ASSERT_THAT(
bind(listen_fd.get(), AsSockAddr(&listen_addr), listener.addr_len),
SyscallSucceeds());
// This test is only interested in deterministically getting a socket in
// connecting state. For that, we use a listen backlog of zero which would
// mean there is exactly one connection that gets established and is enqueued
// to the accept queue. We poll on the listener to ensure that is enqueued.
// After that the subsequent client connect will stay in connecting state as
// the accept queue is full.
constexpr int kBacklog = 0;
ASSERT_THAT(listen(listen_fd.get(), kBacklog), SyscallSucceeds());
// Get the port bound by the listening socket.
socklen_t addrlen = listener.addr_len;
ASSERT_THAT(getsockname(listen_fd.get(), AsSockAddr(&listen_addr), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(listener.family(), listen_addr));
sockaddr_storage conn_addr = connector.addr;
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
FileDescriptor established_client = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP));
int ret = connect(established_client.get(), AsSockAddr(&conn_addr),
connector.addr_len);
if (ret != 0) {
EXPECT_THAT(ret, SyscallFailsWithErrno(EINPROGRESS));
}
// On some kernels a backlog of 0 means no backlog, while on others it means a
// backlog of 1. See commit c609e6aae4efcf383fe86b195d1b060befcb3666 for more
// explanation.
//
// If we timeout connecting to loopback, we're on a kernel with no backlog.
pollfd pfd = {
.fd = established_client.get(),
.events = POLLIN | POLLOUT,
};
if (!poll(&pfd, 1, kTimeout)) {
// We're on one of those kernels. It should be impossible to establish the
// connection, so connect will always return EALREADY.
EXPECT_THAT(connect(established_client.get(), AsSockAddr(&conn_addr),
connector.addr_len),
SyscallFailsWithErrno(EALREADY));
return;
}
// Ensure that the accept queue has the completed connection.
pfd = {
.fd = listen_fd.get(),
.events = POLLIN,
};
ASSERT_THAT(poll(&pfd, 1, kTimeout), SyscallSucceedsWithValue(1));
ASSERT_EQ(pfd.revents, POLLIN);
FileDescriptor connecting_client = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP));
// Keep the last client in connecting state.
ret = connect(connecting_client.get(), AsSockAddr(&conn_addr),
connector.addr_len);
if (ret != 0) {
EXPECT_THAT(ret, SyscallFailsWithErrno(EINPROGRESS));
}
hangup(listen_fd);
std::array<std::pair<int, int>, 2> sockets = {
std::make_pair(established_client.get(), ECONNRESET),
std::make_pair(connecting_client.get(), ECONNREFUSED),
};
for (size_t i = 0; i < sockets.size(); i++) {
SCOPED_TRACE(absl::StrCat("i=", i));
auto [fd, expected_errno] = sockets[i];
pollfd pfd = {
.fd = fd,
};
// When the listening socket is closed, the peer would reset the connection.
EXPECT_THAT(poll(&pfd, 1, kTimeout), SyscallSucceedsWithValue(1));
EXPECT_EQ(pfd.revents, POLLHUP | POLLERR);
char c;
EXPECT_THAT(read(fd, &c, sizeof(c)), SyscallFailsWithErrno(expected_errno));
}
}
TEST_P(SocketInetLoopbackTest, TCPListenCloseConnectingRead) {
TestListenHangupConnectingRead(GetParam(), [](FileDescriptor& f) {
ASSERT_THAT(close(f.release()), SyscallSucceeds());
});
}
TEST_P(SocketInetLoopbackTest, TCPListenShutdownConnectingRead) {
TestListenHangupConnectingRead(GetParam(), [](FileDescriptor& f) {
ASSERT_THAT(shutdown(f.get(), SHUT_RD), SyscallSucceeds());
});
}
// Test close of a non-blocking connecting socket.
TEST_P(SocketInetLoopbackTest, TCPNonBlockingConnectClose) {
SocketInetTestParam const& param = GetParam();
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
// Create the listening socket.
FileDescriptor listen_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(listener.family(), SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP));
sockaddr_storage listen_addr = listener.addr;
ASSERT_THAT(
bind(listen_fd.get(), AsSockAddr(&listen_addr), listener.addr_len),
SyscallSucceeds());
ASSERT_THAT(listen(listen_fd.get(), 0), SyscallSucceeds());
// Get the port bound by the listening socket.
socklen_t addrlen = listener.addr_len;
ASSERT_THAT(getsockname(listen_fd.get(), AsSockAddr(&listen_addr), &addrlen),
SyscallSucceeds());
ASSERT_EQ(addrlen, listener.addr_len);
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(listener.family(), listen_addr));
sockaddr_storage conn_addr = connector.addr;
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
// Try many iterations to catch a race with socket close and handshake
// completion.
for (int i = 0; i < 100; ++i) {
FileDescriptor client = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP));
ASSERT_THAT(
connect(client.get(), AsSockAddr(&conn_addr), connector.addr_len),
SyscallFailsWithErrno(EINPROGRESS));
ASSERT_THAT(close(client.release()), SyscallSucceeds());
// Accept any connections and check if they were closed from the peer. Not
// all client connects would result in an acceptable connection as the
// client handshake might never complete if the socket close was processed
// sooner than the non-blocking connect OR the accept queue is full. We are
// only interested in the case where we do have an acceptable completed
// connection. The accept is non-blocking here, which means that at the time
// of listener close (after the loop ends), we could still have a completed
// connection (from connect of any previous iteration) in the accept queue.
// The listener close would clean up the accept queue.
int accepted_fd;
ASSERT_THAT(accepted_fd = accept(listen_fd.get(), nullptr, nullptr),
AnyOf(SyscallSucceeds(), SyscallFailsWithErrno(EWOULDBLOCK)));
if (accepted_fd < 0) {
continue;
}
FileDescriptor accepted(accepted_fd);
struct pollfd pfd = {
.fd = accepted.get(),
.events = POLLIN | POLLRDHUP,
};
// Use a large timeout to accomodate for retransmitted FINs.
constexpr int kTimeout = 30000;
int n = poll(&pfd, 1, kTimeout);
ASSERT_GE(n, 0) << strerror(errno);
ASSERT_EQ(n, 1);
if (IsRunningOnGvisor() && GvisorPlatform() != Platform::kFuchsia) {
// TODO(gvisor.dev/issue/6015): Notify POLLRDHUP on incoming FIN.
ASSERT_EQ(pfd.revents, POLLIN);
} else {
ASSERT_EQ(pfd.revents, POLLIN | POLLRDHUP);
}
ASSERT_THAT(close(accepted.release()), SyscallSucceeds());
}
}
// TODO(b/153489135): Remove once bug is fixed. Test fails w/
// random save as established connections which can't be delivered to the accept
// queue because the queue is full are not correctly delivered after restore
// causing the last accept to timeout on the restore.
TEST_P(SocketInetLoopbackTest, TCPAcceptBacklogSizes) {
SocketInetTestParam const& param = GetParam();
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
// Create the listening socket.
const FileDescriptor listen_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(listener.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage listen_addr = listener.addr;
ASSERT_THAT(
bind(listen_fd.get(), AsSockAddr(&listen_addr), listener.addr_len),
SyscallSucceeds());
// Get the port bound by the listening socket.
socklen_t addrlen = listener.addr_len;
ASSERT_THAT(getsockname(listen_fd.get(), AsSockAddr(&listen_addr), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(listener.family(), listen_addr));
std::array<int, 3> backlogs = {-1, 0, 1};
for (auto& backlog : backlogs) {
ASSERT_THAT(listen(listen_fd.get(), backlog), SyscallSucceeds());
int expected_accepts;
if (backlog < 0) {
expected_accepts = 1024;
} else {
// See the comment in TCPBacklog for why this isn't backlog + 1.
expected_accepts = backlog;
}
for (int i = 0; i < expected_accepts; i++) {
SCOPED_TRACE(absl::StrCat("i=", i));
// Connect to the listening socket.
const FileDescriptor conn_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage conn_addr = connector.addr;
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
ASSERT_THAT(RetryEINTR(connect)(conn_fd.get(), AsSockAddr(&conn_addr),
connector.addr_len),
SyscallSucceeds());
const FileDescriptor accepted =
ASSERT_NO_ERRNO_AND_VALUE(Accept(listen_fd.get(), nullptr, nullptr));
}
}
}
// TODO(b/153489135): Remove once bug is fixed. Test fails w/
// random save as established connections which can't be delivered to the accept
// queue because the queue is full are not correctly delivered after restore
// causing the last accept to timeout on the restore.
TEST_P(SocketInetLoopbackTest, TCPBacklog) {
SocketInetTestParam const& param = GetParam();
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
// Create the listening socket.
const FileDescriptor listen_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(listener.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage listen_addr = listener.addr;
ASSERT_THAT(
bind(listen_fd.get(), AsSockAddr(&listen_addr), listener.addr_len),
SyscallSucceeds());
constexpr int kBacklogSize = 2;
ASSERT_THAT(listen(listen_fd.get(), kBacklogSize), SyscallSucceeds());
// Get the port bound by the listening socket.
socklen_t addrlen = listener.addr_len;
ASSERT_THAT(getsockname(listen_fd.get(), AsSockAddr(&listen_addr), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(listener.family(), listen_addr));
int i = 0;
while (1) {
SCOPED_TRACE(absl::StrCat("i=", i));
int ret;
// Connect to the listening socket.
const FileDescriptor conn_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP));
sockaddr_storage conn_addr = connector.addr;
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
ret = connect(conn_fd.get(), AsSockAddr(&conn_addr), connector.addr_len);
if (ret != 0) {
EXPECT_THAT(ret, SyscallFailsWithErrno(EINPROGRESS));
pollfd pfd = {
.fd = conn_fd.get(),
.events = POLLOUT,
};
ret = poll(&pfd, 1, 3000);
if (ret == 0) break;
EXPECT_THAT(ret, SyscallSucceedsWithValue(1));
}
EXPECT_THAT(RetryEINTR(send)(conn_fd.get(), &i, sizeof(i), 0),
SyscallSucceedsWithValue(sizeof(i)));
ASSERT_THAT(shutdown(conn_fd.get(), SHUT_RDWR), SyscallSucceeds());
i++;
}
int client_conns = i;
int accepted_conns = 0;
for (; i != 0; i--) {
SCOPED_TRACE(absl::StrCat("i=", i));
pollfd pfd = {
.fd = listen_fd.get(),
.events = POLLIN,
};
// Look for incoming connections to accept. The last connect request could
// be established from the client side, but the ACK of the handshake could
// be dropped by the listener if the accept queue was filled up by the
// previous connect.
int ret;
ASSERT_THAT(ret = poll(&pfd, 1, 3000), SyscallSucceeds());
if (ret == 0) break;
if (pfd.revents == POLLIN) {
// Accept the connection.
//
// We have to assign a name to the accepted socket, as unamed temporary
// objects are destructed upon full evaluation of the expression it is in,
// potentially causing the connecting socket to fail to shutdown properly.
auto accepted =
ASSERT_NO_ERRNO_AND_VALUE(Accept(listen_fd.get(), nullptr, nullptr));
accepted_conns++;
}
}
// We should accept at least listen backlog + 1 connections. As the stack is
// enqueuing established connections to the accept queue, newer SYNs could
// still be replied to causing those client connections would be accepted as
// we start dequeuing the queue.
//
// On some kernels this can value can be off by one, so we don't add 1 to
// kBacklogSize. See commit c609e6aae4efcf383fe86b195d1b060befcb3666 for more
// explanation.
ASSERT_GE(accepted_conns, kBacklogSize);
ASSERT_GE(client_conns, accepted_conns);
}
// TODO(b/153489135): Remove once bug is fixed. Test fails w/
// random save as established connections which can't be delivered to the accept
// queue because the queue is full are not correctly delivered after restore
// causing the last accept to timeout on the restore.
TEST_P(SocketInetLoopbackTest, TCPBacklogAcceptAll) {
SocketInetTestParam const& param = GetParam();
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
// Create the listening socket.
FileDescriptor listen_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(listener.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage listen_addr = listener.addr;
ASSERT_THAT(
bind(listen_fd.get(), AsSockAddr(&listen_addr), listener.addr_len),
SyscallSucceeds());
constexpr int kBacklog = 1;
ASSERT_THAT(listen(listen_fd.get(), kBacklog), SyscallSucceeds());
// Get the port bound by the listening socket.
socklen_t addrlen = listener.addr_len;
ASSERT_THAT(getsockname(listen_fd.get(), AsSockAddr(&listen_addr), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(listener.family(), listen_addr));
sockaddr_storage conn_addr = connector.addr;
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
// Fill up the accept queue and trigger more client connections which would be
// waiting to be accepted.
//
// See the comment in TCPBacklog for why this isn't backlog + 1.
std::array<FileDescriptor, kBacklog> established_clients;
for (auto& fd : established_clients) {
fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM, IPPROTO_TCP));
ASSERT_THAT(connect(fd.get(), AsSockAddr(&conn_addr), connector.addr_len),
SyscallSucceeds());
}
std::array<FileDescriptor, kBacklog> waiting_clients;
for (auto& fd : waiting_clients) {
fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP));
int ret = connect(fd.get(), AsSockAddr(&conn_addr), connector.addr_len);
if (ret != 0) {
EXPECT_THAT(ret, SyscallFailsWithErrno(EINPROGRESS));
}
}
auto accept_connection = [&]() {
constexpr int kTimeout = 10000;
pollfd pfd = {
.fd = listen_fd.get(),
.events = POLLIN,
};
ASSERT_THAT(poll(&pfd, 1, kTimeout), SyscallSucceedsWithValue(1));
ASSERT_EQ(pfd.revents, POLLIN);
// Accept the connection.
//
// We have to assign a name to the accepted socket, as unamed temporary
// objects are destructed upon full evaluation of the expression it is in,
// potentially causing the connecting socket to fail to shutdown properly.
auto accepted =
ASSERT_NO_ERRNO_AND_VALUE(Accept(listen_fd.get(), nullptr, nullptr));
};
// Ensure that we accept all client connections. The waiting connections would
// get enqueued as we drain the accept queue.
for (int i = 0; i < std::size(established_clients); i++) {
SCOPED_TRACE(absl::StrCat("established clients i=", i));
accept_connection();
}
// The waiting client connections could be in one of these 2 states:
// (1) SYN_SENT: if the SYN was dropped because accept queue was full
// (2) ESTABLISHED: if the listener sent back a SYNACK, but may have dropped
// the ACK from the client if the accept queue was full (send out a data to
// re-send that ACK, to address that case).
for (int i = 0; i < std::size(waiting_clients); i++) {
SCOPED_TRACE(absl::StrCat("waiting clients i=", i));
constexpr int kTimeout = 10000;
pollfd pfd = {
.fd = waiting_clients[i].get(),
.events = POLLOUT,
};
EXPECT_THAT(poll(&pfd, 1, kTimeout), SyscallSucceedsWithValue(1));
EXPECT_EQ(pfd.revents, POLLOUT);
char c;
EXPECT_THAT(RetryEINTR(send)(waiting_clients[i].get(), &c, sizeof(c), 0),
SyscallSucceedsWithValue(sizeof(c)));
accept_connection();
}
}
// TCPResetAfterClose creates a pair of connected sockets then closes
// one end to trigger FIN_WAIT2 state for the closed endpoint verifies
// that we generate RSTs for any new data after the socket is fully
// closed.
TEST_P(SocketInetLoopbackTest, TCPResetAfterClose) {
SocketInetTestParam const& param = GetParam();
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
// Create the listening socket.
const FileDescriptor listen_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(listener.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage listen_addr = listener.addr;
ASSERT_THAT(
bind(listen_fd.get(), AsSockAddr(&listen_addr), listener.addr_len),
SyscallSucceeds());
ASSERT_THAT(listen(listen_fd.get(), SOMAXCONN), SyscallSucceeds());
// Get the port bound by the listening socket.
socklen_t addrlen = listener.addr_len;
ASSERT_THAT(getsockname(listen_fd.get(), AsSockAddr(&listen_addr), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(listener.family(), listen_addr));
// Connect to the listening socket.
FileDescriptor conn_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage conn_addr = connector.addr;
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
ASSERT_THAT(RetryEINTR(connect)(conn_fd.get(), AsSockAddr(&conn_addr),
connector.addr_len),
SyscallSucceeds());
// Accept the connection.
auto accepted =
ASSERT_NO_ERRNO_AND_VALUE(Accept(listen_fd.get(), nullptr, nullptr));
// close the connecting FD to trigger FIN_WAIT2 on the connected fd.
conn_fd.reset();
int data = 1234;
// Now send data which should trigger a RST as the other end should
// have timed out and closed the socket.
EXPECT_THAT(RetryEINTR(send)(accepted.get(), &data, sizeof(data), 0),
SyscallSucceeds());
// Sleep for a shortwhile to get a RST back.
absl::SleepFor(absl::Seconds(1));
// Try writing again and we should get an EPIPE back.
EXPECT_THAT(RetryEINTR(send)(accepted.get(), &data, sizeof(data), 0),
SyscallFailsWithErrno(EPIPE));
// Trying to read should return zero as the other end did send
// us a FIN. We do it twice to verify that the RST does not cause an
// ECONNRESET on the read after EOF has been read by applicaiton.
EXPECT_THAT(RetryEINTR(recv)(accepted.get(), &data, sizeof(data), 0),
SyscallSucceedsWithValue(0));
EXPECT_THAT(RetryEINTR(recv)(accepted.get(), &data, sizeof(data), 0),
SyscallSucceedsWithValue(0));
}
TEST_P(SocketInetLoopbackTest, AcceptedInheritsTCPUserTimeout) {
SocketInetTestParam const& param = GetParam();
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
// Create the listening socket.
const FileDescriptor listen_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(listener.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage listen_addr = listener.addr;
ASSERT_THAT(
bind(listen_fd.get(), AsSockAddr(&listen_addr), listener.addr_len),
SyscallSucceeds());
ASSERT_THAT(listen(listen_fd.get(), SOMAXCONN), SyscallSucceeds());
// Get the port bound by the listening socket.
socklen_t addrlen = listener.addr_len;
ASSERT_THAT(getsockname(listen_fd.get(), AsSockAddr(&listen_addr), &addrlen),
SyscallSucceeds());
const uint16_t port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(listener.family(), listen_addr));
// Set the userTimeout on the listening socket.
constexpr int kUserTimeout = 10;
ASSERT_THAT(setsockopt(listen_fd.get(), IPPROTO_TCP, TCP_USER_TIMEOUT,
&kUserTimeout, sizeof(kUserTimeout)),
SyscallSucceeds());
// Connect to the listening socket.
FileDescriptor conn_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage conn_addr = connector.addr;
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
ASSERT_THAT(RetryEINTR(connect)(conn_fd.get(), AsSockAddr(&conn_addr),
connector.addr_len),
SyscallSucceeds());
// Accept the connection.
auto accepted =
ASSERT_NO_ERRNO_AND_VALUE(Accept(listen_fd.get(), nullptr, nullptr));
// Verify that the accepted socket inherited the user timeout set on
// listening socket.
int get = -1;
socklen_t get_len = sizeof(get);
ASSERT_THAT(
getsockopt(accepted.get(), IPPROTO_TCP, TCP_USER_TIMEOUT, &get, &get_len),
SyscallSucceeds());
EXPECT_EQ(get_len, sizeof(get));
EXPECT_EQ(get, kUserTimeout);
}
TEST_P(SocketInetLoopbackTest, TCPAcceptAfterReset) {
SocketInetTestParam const& param = GetParam();
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
// Create the listening socket.
const FileDescriptor listen_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(listener.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage listen_addr = listener.addr;
ASSERT_THAT(
bind(listen_fd.get(), AsSockAddr(&listen_addr), listener.addr_len),
SyscallSucceeds());
ASSERT_THAT(listen(listen_fd.get(), SOMAXCONN), SyscallSucceeds());
// Get the port bound by the listening socket.
{
socklen_t addrlen = listener.addr_len;
ASSERT_THAT(
getsockname(listen_fd.get(), AsSockAddr(&listen_addr), &addrlen),
SyscallSucceeds());
}
const uint16_t port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(listener.family(), listen_addr));
// Connect to the listening socket.
FileDescriptor conn_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage conn_addr = connector.addr;
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
// TODO(b/153489135): Reenable Cooperative S/R once bug is fixed.
DisableSave ds;
ASSERT_THAT(RetryEINTR(connect)(conn_fd.get(), AsSockAddr(&conn_addr),
connector.addr_len),
SyscallSucceeds());
// Trigger a RST by turning linger off and closing the socket.
struct linger opt = {
.l_onoff = 1,
.l_linger = 0,
};
ASSERT_THAT(
setsockopt(conn_fd.get(), SOL_SOCKET, SO_LINGER, &opt, sizeof(opt)),
SyscallSucceeds());
ASSERT_THAT(close(conn_fd.release()), SyscallSucceeds());
if (IsRunningOnGvisor()) {
// Gvisor packet procssing is asynchronous and can take a bit of time in
// some cases so we give it a bit of time to process the RST packet before
// calling accept.
//
// There is nothing to poll() on so we have no choice but to use a sleep
// here.
absl::SleepFor(absl::Milliseconds(100));
}
sockaddr_storage accept_addr;
socklen_t addrlen = sizeof(accept_addr);
auto accept_fd = ASSERT_NO_ERRNO_AND_VALUE(
Accept(listen_fd.get(), AsSockAddr(&accept_addr), &addrlen));
ASSERT_EQ(addrlen, listener.addr_len);
// Wait for accept_fd to process the RST.
constexpr int kTimeout = 10000;
pollfd pfd = {
.fd = accept_fd.get(),
.events = POLLIN,
};
ASSERT_THAT(poll(&pfd, 1, kTimeout), SyscallSucceedsWithValue(1));
ASSERT_EQ(pfd.revents, POLLIN | POLLHUP | POLLERR);
{
int err;
socklen_t optlen = sizeof(err);
ASSERT_THAT(
getsockopt(accept_fd.get(), SOL_SOCKET, SO_ERROR, &err, &optlen),
SyscallSucceeds());
// This should return ECONNRESET as the socket just received a RST packet
// from the peer.
ASSERT_EQ(optlen, sizeof(err));
ASSERT_EQ(err, ECONNRESET);
}
{
int err;
socklen_t optlen = sizeof(err);
ASSERT_THAT(
getsockopt(accept_fd.get(), SOL_SOCKET, SO_ERROR, &err, &optlen),
SyscallSucceeds());
// This should return no error as the previous getsockopt call would have
// cleared the socket error.
ASSERT_EQ(optlen, sizeof(err));
ASSERT_EQ(err, 0);
}
{
sockaddr_storage peer_addr;
socklen_t addrlen = sizeof(peer_addr);
// The socket is not connected anymore and should return ENOTCONN.
ASSERT_THAT(getpeername(accept_fd.get(), AsSockAddr(&peer_addr), &addrlen),
SyscallFailsWithErrno(ENOTCONN));
}
}
// TODO(gvisor.dev/issue/1688): Partially completed passive endpoints are not
// saved. Enable S/R once issue is fixed.
TEST_P(SocketInetLoopbackTest, TCPDeferAccept) {
// TODO(gvisor.dev/issue/1688): Partially completed passive endpoints are not
// saved. Enable S/R issue is fixed.
DisableSave ds;
SocketInetTestParam const& param = GetParam();
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
// Create the listening socket.
const FileDescriptor listen_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(listener.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage listen_addr = listener.addr;
ASSERT_THAT(
bind(listen_fd.get(), AsSockAddr(&listen_addr), listener.addr_len),
SyscallSucceeds());
ASSERT_THAT(listen(listen_fd.get(), SOMAXCONN), SyscallSucceeds());
// Get the port bound by the listening socket.
socklen_t addrlen = listener.addr_len;
ASSERT_THAT(getsockname(listen_fd.get(), AsSockAddr(&listen_addr), &addrlen),
SyscallSucceeds());
const uint16_t port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(listener.family(), listen_addr));
// Set the TCP_DEFER_ACCEPT on the listening socket.
constexpr int kTCPDeferAccept = 3;
ASSERT_THAT(setsockopt(listen_fd.get(), IPPROTO_TCP, TCP_DEFER_ACCEPT,
&kTCPDeferAccept, sizeof(kTCPDeferAccept)),
SyscallSucceeds());
// Connect to the listening socket.
FileDescriptor conn_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage conn_addr = connector.addr;
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
ASSERT_THAT(RetryEINTR(connect)(conn_fd.get(), AsSockAddr(&conn_addr),
connector.addr_len),
SyscallSucceeds());
// Set the listening socket to nonblock so that we can verify that there is no
// connection in queue despite the connect above succeeding since the peer has
// sent no data and TCP_DEFER_ACCEPT is set on the listening socket. Set the
// FD to O_NONBLOCK.
int opts;
ASSERT_THAT(opts = fcntl(listen_fd.get(), F_GETFL), SyscallSucceeds());
opts |= O_NONBLOCK;
ASSERT_THAT(fcntl(listen_fd.get(), F_SETFL, opts), SyscallSucceeds());
ASSERT_THAT(accept(listen_fd.get(), nullptr, nullptr),
SyscallFailsWithErrno(EWOULDBLOCK));
// Set FD back to blocking.
opts &= ~O_NONBLOCK;
ASSERT_THAT(fcntl(listen_fd.get(), F_SETFL, opts), SyscallSucceeds());
// Now write some data to the socket.
int data = 0;
ASSERT_THAT(RetryEINTR(write)(conn_fd.get(), &data, sizeof(data)),
SyscallSucceedsWithValue(sizeof(data)));
// This should now cause the connection to complete and be delivered to the
// accept socket.
// Accept the connection.
auto accepted =
ASSERT_NO_ERRNO_AND_VALUE(Accept(listen_fd.get(), nullptr, nullptr));
// Verify that the accepted socket returns the data written.
int get = -1;
ASSERT_THAT(RetryEINTR(recv)(accepted.get(), &get, sizeof(get), 0),
SyscallSucceedsWithValue(sizeof(get)));
EXPECT_EQ(get, data);
}
// TODO(gvisor.dev/issue/1688): Partially completed passive endpoints are not
// saved. Enable S/R once issue is fixed.
TEST_P(SocketInetLoopbackTest, TCPDeferAcceptTimeout) {
// TODO(gvisor.dev/issue/1688): Partially completed passive endpoints are not
// saved. Enable S/R once issue is fixed.
DisableSave ds;
SocketInetTestParam const& param = GetParam();
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
// Create the listening socket.
const FileDescriptor listen_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(listener.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage listen_addr = listener.addr;
ASSERT_THAT(
bind(listen_fd.get(), AsSockAddr(&listen_addr), listener.addr_len),
SyscallSucceeds());
ASSERT_THAT(listen(listen_fd.get(), SOMAXCONN), SyscallSucceeds());
// Get the port bound by the listening socket.
socklen_t addrlen = listener.addr_len;
ASSERT_THAT(getsockname(listen_fd.get(), AsSockAddr(&listen_addr), &addrlen),
SyscallSucceeds());
const uint16_t port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(listener.family(), listen_addr));
// Set the TCP_DEFER_ACCEPT on the listening socket.
constexpr int kTCPDeferAccept = 3;
ASSERT_THAT(setsockopt(listen_fd.get(), IPPROTO_TCP, TCP_DEFER_ACCEPT,
&kTCPDeferAccept, sizeof(kTCPDeferAccept)),
SyscallSucceeds());
// Connect to the listening socket.
FileDescriptor conn_fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM, IPPROTO_TCP));
sockaddr_storage conn_addr = connector.addr;
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
ASSERT_THAT(RetryEINTR(connect)(conn_fd.get(), AsSockAddr(&conn_addr),
connector.addr_len),
SyscallSucceeds());
// Set the listening socket to nonblock so that we can verify that there is no
// connection in queue despite the connect above succeeding since the peer has
// sent no data and TCP_DEFER_ACCEPT is set on the listening socket. Set the
// FD to O_NONBLOCK.
int opts;
ASSERT_THAT(opts = fcntl(listen_fd.get(), F_GETFL), SyscallSucceeds());
opts |= O_NONBLOCK;
ASSERT_THAT(fcntl(listen_fd.get(), F_SETFL, opts), SyscallSucceeds());
// Verify that there is no acceptable connection before TCP_DEFER_ACCEPT
// timeout is hit.
absl::SleepFor(absl::Seconds(kTCPDeferAccept - 1));
ASSERT_THAT(accept(listen_fd.get(), nullptr, nullptr),
SyscallFailsWithErrno(EWOULDBLOCK));
// Set FD back to blocking.
opts &= ~O_NONBLOCK;
ASSERT_THAT(fcntl(listen_fd.get(), F_SETFL, opts), SyscallSucceeds());
// Now sleep for a little over the TCP_DEFER_ACCEPT duration. When the timeout
// is hit a SYN-ACK should be retransmitted by the listener as a last ditch
// attempt to complete the connection with or without data.
absl::SleepFor(absl::Seconds(2));
// Verify that we have a connection that can be accepted even though no
// data was written.
auto accepted =
ASSERT_NO_ERRNO_AND_VALUE(Accept(listen_fd.get(), nullptr, nullptr));
}
INSTANTIATE_TEST_SUITE_P(All, SocketInetLoopbackTest,
SocketInetLoopbackTestValues(),
DescribeSocketInetTestParam);
using SocketInetReusePortTest = ::testing::TestWithParam<SocketInetTestParam>;
// TODO(gvisor.dev/issue/940): Remove when portHint/stack.Seed is
// saved/restored.
TEST_P(SocketInetReusePortTest, TcpPortReuseMultiThread) {
SocketInetTestParam const& param = GetParam();
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
sockaddr_storage listen_addr = listener.addr;
sockaddr_storage conn_addr = connector.addr;
constexpr int kThreadCount = 3;
constexpr int kConnectAttempts = 10000;
// Create the listening socket.
FileDescriptor listener_fds[kThreadCount];
for (int i = 0; i < kThreadCount; i++) {
listener_fds[i] = ASSERT_NO_ERRNO_AND_VALUE(
Socket(listener.family(), SOCK_STREAM, IPPROTO_TCP));
int fd = listener_fds[i].get();
ASSERT_THAT(setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &kSockOptOn,
sizeof(kSockOptOn)),
SyscallSucceeds());
ASSERT_THAT(bind(fd, AsSockAddr(&listen_addr), listener.addr_len),
SyscallSucceeds());
ASSERT_THAT(listen(fd, 40), SyscallSucceeds());
// On the first bind we need to determine which port was bound.
if (i != 0) {
continue;
}
// Get the port bound by the listening socket.
socklen_t addrlen = listener.addr_len;
ASSERT_THAT(
getsockname(listener_fds[0].get(), AsSockAddr(&listen_addr), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(listener.family(), listen_addr));
ASSERT_NO_ERRNO(SetAddrPort(listener.family(), &listen_addr, port));
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
}
std::atomic<int> connects_received = ATOMIC_VAR_INIT(0);
std::unique_ptr<ScopedThread> listen_thread[kThreadCount];
int accept_counts[kThreadCount] = {};
// TODO(avagin): figure how to not disable S/R for the whole test.
// We need to take into account that this test executes a lot of system
// calls from many threads.
DisableSave ds;
for (int i = 0; i < kThreadCount; i++) {
listen_thread[i] = absl::make_unique<ScopedThread>(
[&listener_fds, &accept_counts, i, &connects_received]() {
do {
auto fd = Accept(listener_fds[i].get(), nullptr, nullptr);
if (!fd.ok()) {
if (connects_received >= kConnectAttempts) {
// Another thread have shutdown our read side causing the
// accept to fail.
ASSERT_EQ(errno, EINVAL);
break;
}
ASSERT_NO_ERRNO(fd);
break;
}
// Receive some data from a socket to be sure that the connect()
// system call has been completed on another side.
// Do a short read and then close the socket to trigger a RST. This
// ensures that both ends of the connection are cleaned up and no
// goroutines hang around in TIME-WAIT. We do this so that this test
// does not timeout under gotsan runs where lots of goroutines can
// cause the test to use absurd amounts of memory.
//
// See: https://tools.ietf.org/html/rfc2525#page-50 section 2.17
uint16_t data;
EXPECT_THAT(
RetryEINTR(recv)(fd.ValueOrDie().get(), &data, sizeof(data), 0),
SyscallSucceedsWithValue(sizeof(data)));
accept_counts[i]++;
} while (++connects_received < kConnectAttempts);
// Shutdown all sockets to wake up other threads.
for (int j = 0; j < kThreadCount; j++) {
shutdown(listener_fds[j].get(), SHUT_RDWR);
}
});
}
ScopedThread connecting_thread([&connector, &conn_addr]() {
for (int32_t i = 0; i < kConnectAttempts; i++) {
const FileDescriptor fd = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM, IPPROTO_TCP));
ASSERT_THAT(RetryEINTR(connect)(fd.get(), AsSockAddr(&conn_addr),
connector.addr_len),
SyscallSucceeds());
EXPECT_THAT(RetryEINTR(send)(fd.get(), &i, sizeof(i), 0),
SyscallSucceedsWithValue(sizeof(i)));
}
});
// Join threads to be sure that all connections have been counted
connecting_thread.Join();
for (int i = 0; i < kThreadCount; i++) {
listen_thread[i]->Join();
}
// Check that connections are distributed fairly between listening sockets
for (int i = 0; i < kThreadCount; i++)
EXPECT_THAT(accept_counts[i],
EquivalentWithin((kConnectAttempts / kThreadCount), 0.10));
}
TEST_P(SocketInetReusePortTest, UdpPortReuseMultiThread) {
SocketInetTestParam const& param = GetParam();
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
sockaddr_storage listen_addr = listener.addr;
sockaddr_storage conn_addr = connector.addr;
constexpr int kThreadCount = 3;
// Create the listening socket.
FileDescriptor listener_fds[kThreadCount];
for (int i = 0; i < kThreadCount; i++) {
listener_fds[i] =
ASSERT_NO_ERRNO_AND_VALUE(Socket(listener.family(), SOCK_DGRAM, 0));
int fd = listener_fds[i].get();
ASSERT_THAT(setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &kSockOptOn,
sizeof(kSockOptOn)),
SyscallSucceeds());
ASSERT_THAT(bind(fd, AsSockAddr(&listen_addr), listener.addr_len),
SyscallSucceeds());
// On the first bind we need to determine which port was bound.
if (i != 0) {
continue;
}
// Get the port bound by the listening socket.
socklen_t addrlen = listener.addr_len;
ASSERT_THAT(
getsockname(listener_fds[0].get(), AsSockAddr(&listen_addr), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(listener.family(), listen_addr));
ASSERT_NO_ERRNO(SetAddrPort(listener.family(), &listen_addr, port));
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
}
constexpr int kConnectAttempts = 10000;
std::atomic<int> packets_received = ATOMIC_VAR_INIT(0);
std::unique_ptr<ScopedThread> receiver_thread[kThreadCount];
int packets_per_socket[kThreadCount] = {};
// TODO(avagin): figure how to not disable S/R for the whole test.
DisableSave ds; // Too expensive.
for (int i = 0; i < kThreadCount; i++) {
receiver_thread[i] = absl::make_unique<ScopedThread>(
[&listener_fds, &packets_per_socket, i, &packets_received]() {
do {
struct sockaddr_storage addr = {};
socklen_t addrlen = sizeof(addr);
int data;
auto ret =
RetryEINTR(recvfrom)(listener_fds[i].get(), &data, sizeof(data),
0, AsSockAddr(&addr), &addrlen);
if (packets_received < kConnectAttempts) {
ASSERT_THAT(ret, SyscallSucceedsWithValue(sizeof(data)));
}
if (ret != sizeof(data)) {
// Another thread may have shutdown our read side causing the
// recvfrom to fail.
break;
}
packets_received++;
packets_per_socket[i]++;
// A response is required to synchronize with the main thread,
// otherwise the main thread can send more than can fit into receive
// queues.
EXPECT_THAT(
RetryEINTR(sendto)(listener_fds[i].get(), &data, sizeof(data),
0, AsSockAddr(&addr), addrlen),
SyscallSucceedsWithValue(sizeof(data)));
} while (packets_received < kConnectAttempts);
// Shutdown all sockets to wake up other threads.
for (int j = 0; j < kThreadCount; j++)
shutdown(listener_fds[j].get(), SHUT_RDWR);
});
}
ScopedThread main_thread([&connector, &conn_addr]() {
for (int i = 0; i < kConnectAttempts; i++) {
const FileDescriptor fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(connector.family(), SOCK_DGRAM, 0));
EXPECT_THAT(
RetryEINTR(sendto)(fd.get(), &i, sizeof(i), 0, AsSockAddr(&conn_addr),
connector.addr_len),
SyscallSucceedsWithValue(sizeof(i)));
int data;
EXPECT_THAT(RetryEINTR(recv)(fd.get(), &data, sizeof(data), 0),
SyscallSucceedsWithValue(sizeof(data)));
}
});
main_thread.Join();
// Join threads to be sure that all connections have been counted
for (int i = 0; i < kThreadCount; i++) {
receiver_thread[i]->Join();
}
// Check that packets are distributed fairly between listening sockets.
for (int i = 0; i < kThreadCount; i++)
EXPECT_THAT(packets_per_socket[i],
EquivalentWithin((kConnectAttempts / kThreadCount), 0.10));
}
TEST_P(SocketInetReusePortTest, UdpPortReuseMultiThreadShort) {
SocketInetTestParam const& param = GetParam();
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
sockaddr_storage listen_addr = listener.addr;
sockaddr_storage conn_addr = connector.addr;
constexpr int kThreadCount = 3;
// TODO(b/141211329): endpointsByNic.seed has to be saved/restored.
const DisableSave ds141211329;
// Create listening sockets.
FileDescriptor listener_fds[kThreadCount];
for (int i = 0; i < kThreadCount; i++) {
listener_fds[i] =
ASSERT_NO_ERRNO_AND_VALUE(Socket(listener.family(), SOCK_DGRAM, 0));
int fd = listener_fds[i].get();
ASSERT_THAT(setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &kSockOptOn,
sizeof(kSockOptOn)),
SyscallSucceeds());
ASSERT_THAT(bind(fd, AsSockAddr(&listen_addr), listener.addr_len),
SyscallSucceeds());
// On the first bind we need to determine which port was bound.
if (i != 0) {
continue;
}
// Get the port bound by the listening socket.
socklen_t addrlen = listener.addr_len;
ASSERT_THAT(
getsockname(listener_fds[0].get(), AsSockAddr(&listen_addr), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(listener.family(), listen_addr));
ASSERT_NO_ERRNO(SetAddrPort(listener.family(), &listen_addr, port));
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
}
constexpr int kConnectAttempts = 10;
FileDescriptor client_fds[kConnectAttempts];
// Do the first run without save/restore.
DisableSave ds;
for (int i = 0; i < kConnectAttempts; i++) {
client_fds[i] =
ASSERT_NO_ERRNO_AND_VALUE(Socket(connector.family(), SOCK_DGRAM, 0));
EXPECT_THAT(RetryEINTR(sendto)(client_fds[i].get(), &i, sizeof(i), 0,
AsSockAddr(&conn_addr), connector.addr_len),
SyscallSucceedsWithValue(sizeof(i)));
}
ds.reset();
// Check that a mapping of client and server sockets has
// not been change after save/restore.
for (int i = 0; i < kConnectAttempts; i++) {
EXPECT_THAT(RetryEINTR(sendto)(client_fds[i].get(), &i, sizeof(i), 0,
AsSockAddr(&conn_addr), connector.addr_len),
SyscallSucceedsWithValue(sizeof(i)));
}
pollfd pollfds[kThreadCount];
for (int i = 0; i < kThreadCount; i++) {
pollfds[i].fd = listener_fds[i].get();
pollfds[i].events = POLLIN;
}
std::map<uint16_t, int> portToFD;
int received = 0;
while (received < kConnectAttempts * 2) {
ASSERT_THAT(poll(pollfds, kThreadCount, -1),
SyscallSucceedsWithValue(Gt(0)));
for (int i = 0; i < kThreadCount; i++) {
if ((pollfds[i].revents & POLLIN) == 0) {
continue;
}
received++;
const int fd = pollfds[i].fd;
struct sockaddr_storage addr = {};
socklen_t addrlen = sizeof(addr);
int data;
EXPECT_THAT(RetryEINTR(recvfrom)(fd, &data, sizeof(data), 0,
AsSockAddr(&addr), &addrlen),
SyscallSucceedsWithValue(sizeof(data)));
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(connector.family(), addr));
auto prev_port = portToFD.find(port);
// Check that all packets from one client have been delivered to the
// same server socket.
if (prev_port == portToFD.end()) {
portToFD[port] = fd;
} else {
EXPECT_EQ(portToFD[port], fd);
}
}
}
}
INSTANTIATE_TEST_SUITE_P(
All, SocketInetReusePortTest,
::testing::Values(
// Listeners bound to IPv4 addresses refuse connections using IPv6
// addresses.
SocketInetTestParam{V4Any(), V4Loopback()},
SocketInetTestParam{V4Loopback(), V4MappedLoopback()},
// Listeners bound to IN6ADDR_ANY accept all connections.
SocketInetTestParam{V6Any(), V4Loopback()},
SocketInetTestParam{V6Any(), V6Loopback()},
// Listeners bound to IN6ADDR_LOOPBACK refuse connections using IPv4
// addresses.
SocketInetTestParam{V6Loopback(), V6Loopback()}),
DescribeSocketInetTestParam);
using SocketMultiProtocolInetLoopbackTest =
::testing::TestWithParam<ProtocolTestParam>;
TEST_P(SocketMultiProtocolInetLoopbackTest, V4MappedLoopbackOnlyReservesV4) {
ProtocolTestParam const& param = GetParam();
for (int i = 0; true; i++) {
// Bind the v4 loopback on a dual stack socket.
TestAddress const& test_addr_dual = V4MappedLoopback();
sockaddr_storage addr_dual = test_addr_dual.addr;
const FileDescriptor fd_dual = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_dual.family(), param.type, 0));
ASSERT_THAT(
bind(fd_dual.get(), AsSockAddr(&addr_dual), test_addr_dual.addr_len),
SyscallSucceeds());
// Get the port that we bound.
socklen_t addrlen = test_addr_dual.addr_len;
ASSERT_THAT(getsockname(fd_dual.get(), AsSockAddr(&addr_dual), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(test_addr_dual.family(), addr_dual));
// Verify that we can still bind the v6 loopback on the same port.
TestAddress const& test_addr_v6 = V6Loopback();
sockaddr_storage addr_v6 = test_addr_v6.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v6.family(), &addr_v6, port));
const FileDescriptor fd_v6 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_v6.family(), param.type, 0));
int ret = bind(fd_v6.get(), AsSockAddr(&addr_v6), test_addr_v6.addr_len);
if (ret == -1 && errno == EADDRINUSE) {
// Port may have been in use.
ASSERT_LT(i, 100); // Give up after 100 tries.
continue;
}
ASSERT_THAT(ret, SyscallSucceeds());
// Verify that binding the v4 loopback with the same port on a v4 socket
// fails.
TestAddress const& test_addr_v4 = V4Loopback();
sockaddr_storage addr_v4 = test_addr_v4.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v4.family(), &addr_v4, port));
const FileDescriptor fd_v4 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_v4.family(), param.type, 0));
ASSERT_THAT(bind(fd_v4.get(), AsSockAddr(&addr_v4), test_addr_v4.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// No need to try again.
break;
}
}
TEST_P(SocketMultiProtocolInetLoopbackTest, V4MappedAnyOnlyReservesV4) {
ProtocolTestParam const& param = GetParam();
for (int i = 0; true; i++) {
// Bind the v4 any on a dual stack socket.
TestAddress const& test_addr_dual = V4MappedAny();
sockaddr_storage addr_dual = test_addr_dual.addr;
const FileDescriptor fd_dual = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_dual.family(), param.type, 0));
ASSERT_THAT(
bind(fd_dual.get(), AsSockAddr(&addr_dual), test_addr_dual.addr_len),
SyscallSucceeds());
// Get the port that we bound.
socklen_t addrlen = test_addr_dual.addr_len;
ASSERT_THAT(getsockname(fd_dual.get(), AsSockAddr(&addr_dual), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(test_addr_dual.family(), addr_dual));
// Verify that we can still bind the v6 loopback on the same port.
TestAddress const& test_addr_v6 = V6Loopback();
sockaddr_storage addr_v6 = test_addr_v6.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v6.family(), &addr_v6, port));
const FileDescriptor fd_v6 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_v6.family(), param.type, 0));
int ret = bind(fd_v6.get(), AsSockAddr(&addr_v6), test_addr_v6.addr_len);
if (ret == -1 && errno == EADDRINUSE) {
// Port may have been in use.
ASSERT_LT(i, 100); // Give up after 100 tries.
continue;
}
ASSERT_THAT(ret, SyscallSucceeds());
// Verify that binding the v4 loopback with the same port on a v4 socket
// fails.
TestAddress const& test_addr_v4 = V4Loopback();
sockaddr_storage addr_v4 = test_addr_v4.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v4.family(), &addr_v4, port));
const FileDescriptor fd_v4 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_v4.family(), param.type, 0));
ASSERT_THAT(bind(fd_v4.get(), AsSockAddr(&addr_v4), test_addr_v4.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// No need to try again.
break;
}
}
TEST_P(SocketMultiProtocolInetLoopbackTest, DualStackV6AnyReservesEverything) {
ProtocolTestParam const& param = GetParam();
// Bind the v6 any on a dual stack socket.
TestAddress const& test_addr_dual = V6Any();
sockaddr_storage addr_dual = test_addr_dual.addr;
const FileDescriptor fd_dual =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_dual.family(), param.type, 0));
ASSERT_THAT(
bind(fd_dual.get(), AsSockAddr(&addr_dual), test_addr_dual.addr_len),
SyscallSucceeds());
// Get the port that we bound.
socklen_t addrlen = test_addr_dual.addr_len;
ASSERT_THAT(getsockname(fd_dual.get(), AsSockAddr(&addr_dual), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(test_addr_dual.family(), addr_dual));
// Verify that binding the v6 loopback with the same port fails.
TestAddress const& test_addr_v6 = V6Loopback();
sockaddr_storage addr_v6 = test_addr_v6.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v6.family(), &addr_v6, port));
const FileDescriptor fd_v6 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_v6.family(), param.type, 0));
ASSERT_THAT(bind(fd_v6.get(), AsSockAddr(&addr_v6), test_addr_v6.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that binding the v4 loopback on the same port with a v6 socket
// fails.
TestAddress const& test_addr_v4_mapped = V4MappedLoopback();
sockaddr_storage addr_v4_mapped = test_addr_v4_mapped.addr;
ASSERT_NO_ERRNO(
SetAddrPort(test_addr_v4_mapped.family(), &addr_v4_mapped, port));
const FileDescriptor fd_v4_mapped = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v4_mapped.family(), param.type, 0));
ASSERT_THAT(bind(fd_v4_mapped.get(), AsSockAddr(&addr_v4_mapped),
test_addr_v4_mapped.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that binding the v4 loopback on the same port with a v4 socket
// fails.
TestAddress const& test_addr_v4 = V4Loopback();
sockaddr_storage addr_v4 = test_addr_v4.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v4.family(), &addr_v4, port));
const FileDescriptor fd_v4 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_v4.family(), param.type, 0));
ASSERT_THAT(bind(fd_v4.get(), AsSockAddr(&addr_v4), test_addr_v4.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that binding the v4 any on the same port with a v4 socket
// fails.
TestAddress const& test_addr_v4_any = V4Any();
sockaddr_storage addr_v4_any = test_addr_v4_any.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v4_any.family(), &addr_v4_any, port));
const FileDescriptor fd_v4_any = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v4_any.family(), param.type, 0));
ASSERT_THAT(bind(fd_v4_any.get(), AsSockAddr(&addr_v4_any),
test_addr_v4_any.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
}
TEST_P(SocketMultiProtocolInetLoopbackTest,
DualStackV6AnyReuseAddrDoesNotReserveV4Any) {
ProtocolTestParam const& param = GetParam();
// Bind the v6 any on a dual stack socket.
TestAddress const& test_addr_dual = V6Any();
sockaddr_storage addr_dual = test_addr_dual.addr;
const FileDescriptor fd_dual =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_dual.family(), param.type, 0));
ASSERT_THAT(setsockopt(fd_dual.get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn,
sizeof(kSockOptOn)),
SyscallSucceeds());
ASSERT_THAT(
bind(fd_dual.get(), AsSockAddr(&addr_dual), test_addr_dual.addr_len),
SyscallSucceeds());
// Get the port that we bound.
socklen_t addrlen = test_addr_dual.addr_len;
ASSERT_THAT(getsockname(fd_dual.get(), AsSockAddr(&addr_dual), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(test_addr_dual.family(), addr_dual));
// Verify that binding the v4 any on the same port with a v4 socket succeeds.
TestAddress const& test_addr_v4_any = V4Any();
sockaddr_storage addr_v4_any = test_addr_v4_any.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v4_any.family(), &addr_v4_any, port));
const FileDescriptor fd_v4_any = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v4_any.family(), param.type, 0));
ASSERT_THAT(setsockopt(fd_v4_any.get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn,
sizeof(kSockOptOn)),
SyscallSucceeds());
ASSERT_THAT(bind(fd_v4_any.get(), AsSockAddr(&addr_v4_any),
test_addr_v4_any.addr_len),
SyscallSucceeds());
}
TEST_P(SocketMultiProtocolInetLoopbackTest,
DualStackV6AnyReuseAddrListenReservesV4Any) {
ProtocolTestParam const& param = GetParam();
// Only TCP sockets are supported.
SKIP_IF((param.type & SOCK_STREAM) == 0);
// Bind the v6 any on a dual stack socket.
TestAddress const& test_addr_dual = V6Any();
sockaddr_storage addr_dual = test_addr_dual.addr;
const FileDescriptor fd_dual =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_dual.family(), param.type, 0));
ASSERT_THAT(setsockopt(fd_dual.get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn,
sizeof(kSockOptOn)),
SyscallSucceeds());
ASSERT_THAT(
bind(fd_dual.get(), AsSockAddr(&addr_dual), test_addr_dual.addr_len),
SyscallSucceeds());
ASSERT_THAT(listen(fd_dual.get(), 5), SyscallSucceeds());
// Get the port that we bound.
socklen_t addrlen = test_addr_dual.addr_len;
ASSERT_THAT(getsockname(fd_dual.get(), AsSockAddr(&addr_dual), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(test_addr_dual.family(), addr_dual));
// Verify that binding the v4 any on the same port with a v4 socket succeeds.
TestAddress const& test_addr_v4_any = V4Any();
sockaddr_storage addr_v4_any = test_addr_v4_any.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v4_any.family(), &addr_v4_any, port));
const FileDescriptor fd_v4_any = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v4_any.family(), param.type, 0));
ASSERT_THAT(setsockopt(fd_v4_any.get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn,
sizeof(kSockOptOn)),
SyscallSucceeds());
ASSERT_THAT(bind(fd_v4_any.get(), AsSockAddr(&addr_v4_any),
test_addr_v4_any.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
}
TEST_P(SocketMultiProtocolInetLoopbackTest,
DualStackV6AnyWithListenReservesEverything) {
ProtocolTestParam const& param = GetParam();
// Only TCP sockets are supported.
SKIP_IF((param.type & SOCK_STREAM) == 0);
// Bind the v6 any on a dual stack socket.
TestAddress const& test_addr_dual = V6Any();
sockaddr_storage addr_dual = test_addr_dual.addr;
const FileDescriptor fd_dual =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_dual.family(), param.type, 0));
ASSERT_THAT(
bind(fd_dual.get(), AsSockAddr(&addr_dual), test_addr_dual.addr_len),
SyscallSucceeds());
ASSERT_THAT(listen(fd_dual.get(), 5), SyscallSucceeds());
// Get the port that we bound.
socklen_t addrlen = test_addr_dual.addr_len;
ASSERT_THAT(getsockname(fd_dual.get(), AsSockAddr(&addr_dual), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(test_addr_dual.family(), addr_dual));
// Verify that binding the v6 loopback with the same port fails.
TestAddress const& test_addr_v6 = V6Loopback();
sockaddr_storage addr_v6 = test_addr_v6.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v6.family(), &addr_v6, port));
const FileDescriptor fd_v6 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_v6.family(), param.type, 0));
ASSERT_THAT(bind(fd_v6.get(), AsSockAddr(&addr_v6), test_addr_v6.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that binding the v4 loopback on the same port with a v6 socket
// fails.
TestAddress const& test_addr_v4_mapped = V4MappedLoopback();
sockaddr_storage addr_v4_mapped = test_addr_v4_mapped.addr;
ASSERT_NO_ERRNO(
SetAddrPort(test_addr_v4_mapped.family(), &addr_v4_mapped, port));
const FileDescriptor fd_v4_mapped = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v4_mapped.family(), param.type, 0));
ASSERT_THAT(bind(fd_v4_mapped.get(), AsSockAddr(&addr_v4_mapped),
test_addr_v4_mapped.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that binding the v4 loopback on the same port with a v4 socket
// fails.
TestAddress const& test_addr_v4 = V4Loopback();
sockaddr_storage addr_v4 = test_addr_v4.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v4.family(), &addr_v4, port));
const FileDescriptor fd_v4 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_v4.family(), param.type, 0));
ASSERT_THAT(bind(fd_v4.get(), AsSockAddr(&addr_v4), test_addr_v4.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that binding the v4 any on the same port with a v4 socket
// fails.
TestAddress const& test_addr_v4_any = V4Any();
sockaddr_storage addr_v4_any = test_addr_v4_any.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v4_any.family(), &addr_v4_any, port));
const FileDescriptor fd_v4_any = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v4_any.family(), param.type, 0));
ASSERT_THAT(bind(fd_v4_any.get(), AsSockAddr(&addr_v4_any),
test_addr_v4_any.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
}
TEST_P(SocketMultiProtocolInetLoopbackTest, V6OnlyV6AnyReservesV6) {
ProtocolTestParam const& param = GetParam();
for (int i = 0; true; i++) {
// Bind the v6 any on a v6-only socket.
TestAddress const& test_addr_dual = V6Any();
sockaddr_storage addr_dual = test_addr_dual.addr;
const FileDescriptor fd_dual = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_dual.family(), param.type, 0));
EXPECT_THAT(setsockopt(fd_dual.get(), IPPROTO_IPV6, IPV6_V6ONLY,
&kSockOptOn, sizeof(kSockOptOn)),
SyscallSucceeds());
ASSERT_THAT(
bind(fd_dual.get(), AsSockAddr(&addr_dual), test_addr_dual.addr_len),
SyscallSucceeds());
// Get the port that we bound.
socklen_t addrlen = test_addr_dual.addr_len;
ASSERT_THAT(getsockname(fd_dual.get(), AsSockAddr(&addr_dual), &addrlen),
SyscallSucceeds());
uint16_t const port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(test_addr_dual.family(), addr_dual));
// Verify that binding the v6 loopback with the same port fails.
TestAddress const& test_addr_v6 = V6Loopback();
sockaddr_storage addr_v6 = test_addr_v6.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v6.family(), &addr_v6, port));
const FileDescriptor fd_v6 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_v6.family(), param.type, 0));
ASSERT_THAT(bind(fd_v6.get(), AsSockAddr(&addr_v6), test_addr_v6.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that we can still bind the v4 loopback on the same port.
TestAddress const& test_addr_v4_mapped = V4MappedLoopback();
sockaddr_storage addr_v4_mapped = test_addr_v4_mapped.addr;
ASSERT_NO_ERRNO(
SetAddrPort(test_addr_v4_mapped.family(), &addr_v4_mapped, port));
const FileDescriptor fd_v4_mapped = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v4_mapped.family(), param.type, 0));
int ret = bind(fd_v4_mapped.get(), AsSockAddr(&addr_v4_mapped),
test_addr_v4_mapped.addr_len);
if (ret == -1 && errno == EADDRINUSE) {
// Port may have been in use.
ASSERT_LT(i, 100); // Give up after 100 tries.
continue;
}
ASSERT_THAT(ret, SyscallSucceeds());
// No need to try again.
break;
}
}
TEST_P(SocketMultiProtocolInetLoopbackTest, V6EphemeralPortReserved) {
ProtocolTestParam const& param = GetParam();
for (int i = 0; true; i++) {
// Bind the v6 loopback on a dual stack socket.
TestAddress const& test_addr = V6Loopback();
sockaddr_storage bound_addr = test_addr.addr;
const FileDescriptor bound_fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
ASSERT_THAT(
bind(bound_fd.get(), AsSockAddr(&bound_addr), test_addr.addr_len),
SyscallSucceeds());
// Listen iff TCP.
if (param.type == SOCK_STREAM) {
ASSERT_THAT(listen(bound_fd.get(), SOMAXCONN), SyscallSucceeds());
}
// Get the port that we bound.
socklen_t bound_addr_len = test_addr.addr_len;
ASSERT_THAT(
getsockname(bound_fd.get(), AsSockAddr(&bound_addr), &bound_addr_len),
SyscallSucceeds());
// Connect to bind an ephemeral port.
const FileDescriptor connected_fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
ASSERT_THAT(RetryEINTR(connect)(connected_fd.get(), AsSockAddr(&bound_addr),
bound_addr_len),
SyscallSucceeds());
// Get the ephemeral port.
sockaddr_storage connected_addr = {};
socklen_t connected_addr_len = sizeof(connected_addr);
ASSERT_THAT(getsockname(connected_fd.get(), AsSockAddr(&connected_addr),
&connected_addr_len),
SyscallSucceeds());
uint16_t const ephemeral_port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(test_addr.family(), connected_addr));
// Verify that we actually got an ephemeral port.
ASSERT_NE(ephemeral_port, 0);
// Verify that the ephemeral port is reserved.
const FileDescriptor checking_fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
EXPECT_THAT(bind(checking_fd.get(), AsSockAddr(&connected_addr),
connected_addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that binding the v6 loopback with the same port fails.
TestAddress const& test_addr_v6 = V6Loopback();
sockaddr_storage addr_v6 = test_addr_v6.addr;
ASSERT_NO_ERRNO(
SetAddrPort(test_addr_v6.family(), &addr_v6, ephemeral_port));
const FileDescriptor fd_v6 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_v6.family(), param.type, 0));
ASSERT_THAT(bind(fd_v6.get(), AsSockAddr(&addr_v6), test_addr_v6.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that we can still bind the v4 loopback on the same port.
TestAddress const& test_addr_v4_mapped = V4MappedLoopback();
sockaddr_storage addr_v4_mapped = test_addr_v4_mapped.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v4_mapped.family(), &addr_v4_mapped,
ephemeral_port));
const FileDescriptor fd_v4_mapped = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v4_mapped.family(), param.type, 0));
int ret = bind(fd_v4_mapped.get(), AsSockAddr(&addr_v4_mapped),
test_addr_v4_mapped.addr_len);
if (ret == -1 && errno == EADDRINUSE) {
// Port may have been in use.
ASSERT_LT(i, 100); // Give up after 100 tries.
continue;
}
EXPECT_THAT(ret, SyscallSucceeds());
// No need to try again.
break;
}
}
TEST_P(SocketMultiProtocolInetLoopbackTest, V4MappedEphemeralPortReserved) {
ProtocolTestParam const& param = GetParam();
for (int i = 0; true; i++) {
// Bind the v4 loopback on a dual stack socket.
TestAddress const& test_addr = V4MappedLoopback();
sockaddr_storage bound_addr = test_addr.addr;
const FileDescriptor bound_fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
ASSERT_THAT(
bind(bound_fd.get(), AsSockAddr(&bound_addr), test_addr.addr_len),
SyscallSucceeds());
// Listen iff TCP.
if (param.type == SOCK_STREAM) {
ASSERT_THAT(listen(bound_fd.get(), SOMAXCONN), SyscallSucceeds());
}
// Get the port that we bound.
socklen_t bound_addr_len = test_addr.addr_len;
ASSERT_THAT(
getsockname(bound_fd.get(), AsSockAddr(&bound_addr), &bound_addr_len),
SyscallSucceeds());
// Connect to bind an ephemeral port.
const FileDescriptor connected_fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
ASSERT_THAT(RetryEINTR(connect)(connected_fd.get(), AsSockAddr(&bound_addr),
bound_addr_len),
SyscallSucceeds());
// Get the ephemeral port.
sockaddr_storage connected_addr = {};
socklen_t connected_addr_len = sizeof(connected_addr);
ASSERT_THAT(getsockname(connected_fd.get(), AsSockAddr(&connected_addr),
&connected_addr_len),
SyscallSucceeds());
uint16_t const ephemeral_port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(test_addr.family(), connected_addr));
// Verify that we actually got an ephemeral port.
ASSERT_NE(ephemeral_port, 0);
// Verify that the ephemeral port is reserved.
const FileDescriptor checking_fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
EXPECT_THAT(bind(checking_fd.get(), AsSockAddr(&connected_addr),
connected_addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that binding the v4 loopback on the same port with a v4 socket
// fails.
TestAddress const& test_addr_v4 = V4Loopback();
sockaddr_storage addr_v4 = test_addr_v4.addr;
ASSERT_NO_ERRNO(
SetAddrPort(test_addr_v4.family(), &addr_v4, ephemeral_port));
const FileDescriptor fd_v4 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr_v4.family(), param.type, 0));
EXPECT_THAT(bind(fd_v4.get(), AsSockAddr(&addr_v4), test_addr_v4.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that binding the v6 any on the same port with a dual-stack socket
// fails.
TestAddress const& test_addr_v6_any = V6Any();
sockaddr_storage addr_v6_any = test_addr_v6_any.addr;
ASSERT_NO_ERRNO(
SetAddrPort(test_addr_v6_any.family(), &addr_v6_any, ephemeral_port));
const FileDescriptor fd_v6_any = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v6_any.family(), param.type, 0));
ASSERT_THAT(bind(fd_v6_any.get(), AsSockAddr(&addr_v6_any),
test_addr_v6_any.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// For some reason, binding the TCP v6-only any is flaky on Linux. Maybe we
// tend to run out of ephemeral ports? Regardless, binding the v6 loopback
// seems pretty reliable. Only try to bind the v6-only any on UDP and
// gVisor.
int ret = -1;
if (!IsRunningOnGvisor() && param.type == SOCK_STREAM) {
// Verify that we can still bind the v6 loopback on the same port.
TestAddress const& test_addr_v6 = V6Loopback();
sockaddr_storage addr_v6 = test_addr_v6.addr;
ASSERT_NO_ERRNO(
SetAddrPort(test_addr_v6.family(), &addr_v6, ephemeral_port));
const FileDescriptor fd_v6 = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v6.family(), param.type, 0));
ret = bind(fd_v6.get(), AsSockAddr(&addr_v6), test_addr_v6.addr_len);
} else {
// Verify that we can still bind the v6 any on the same port with a
// v6-only socket.
const FileDescriptor fd_v6_only_any = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v6_any.family(), param.type, 0));
EXPECT_THAT(setsockopt(fd_v6_only_any.get(), IPPROTO_IPV6, IPV6_V6ONLY,
&kSockOptOn, sizeof(kSockOptOn)),
SyscallSucceeds());
ret = bind(fd_v6_only_any.get(), AsSockAddr(&addr_v6_any),
test_addr_v6_any.addr_len);
}
if (ret == -1 && errno == EADDRINUSE) {
// Port may have been in use.
ASSERT_LT(i, 100); // Give up after 100 tries.
continue;
}
EXPECT_THAT(ret, SyscallSucceeds());
// No need to try again.
break;
}
}
TEST_P(SocketMultiProtocolInetLoopbackTest, V4EphemeralPortReserved) {
ProtocolTestParam const& param = GetParam();
for (int i = 0; true; i++) {
// Bind the v4 loopback on a v4 socket.
TestAddress const& test_addr = V4Loopback();
sockaddr_storage bound_addr = test_addr.addr;
const FileDescriptor bound_fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
ASSERT_THAT(
bind(bound_fd.get(), AsSockAddr(&bound_addr), test_addr.addr_len),
SyscallSucceeds());
// Listen iff TCP.
if (param.type == SOCK_STREAM) {
ASSERT_THAT(listen(bound_fd.get(), SOMAXCONN), SyscallSucceeds());
}
// Get the port that we bound.
socklen_t bound_addr_len = test_addr.addr_len;
ASSERT_THAT(
getsockname(bound_fd.get(), AsSockAddr(&bound_addr), &bound_addr_len),
SyscallSucceeds());
// Connect to bind an ephemeral port.
const FileDescriptor connected_fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
ASSERT_THAT(RetryEINTR(connect)(connected_fd.get(), AsSockAddr(&bound_addr),
bound_addr_len),
SyscallSucceeds());
// Get the ephemeral port.
sockaddr_storage connected_addr = {};
socklen_t connected_addr_len = sizeof(connected_addr);
ASSERT_THAT(getsockname(connected_fd.get(), AsSockAddr(&connected_addr),
&connected_addr_len),
SyscallSucceeds());
uint16_t const ephemeral_port =
ASSERT_NO_ERRNO_AND_VALUE(AddrPort(test_addr.family(), connected_addr));
// Verify that we actually got an ephemeral port.
ASSERT_NE(ephemeral_port, 0);
// Verify that the ephemeral port is reserved.
const FileDescriptor checking_fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
EXPECT_THAT(bind(checking_fd.get(), AsSockAddr(&connected_addr),
connected_addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that binding the v4 loopback on the same port with a v6 socket
// fails.
TestAddress const& test_addr_v4_mapped = V4MappedLoopback();
sockaddr_storage addr_v4_mapped = test_addr_v4_mapped.addr;
ASSERT_NO_ERRNO(SetAddrPort(test_addr_v4_mapped.family(), &addr_v4_mapped,
ephemeral_port));
const FileDescriptor fd_v4_mapped = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v4_mapped.family(), param.type, 0));
EXPECT_THAT(bind(fd_v4_mapped.get(), AsSockAddr(&addr_v4_mapped),
test_addr_v4_mapped.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// Verify that binding the v6 any on the same port with a dual-stack socket
// fails.
TestAddress const& test_addr_v6_any = V6Any();
sockaddr_storage addr_v6_any = test_addr_v6_any.addr;
ASSERT_NO_ERRNO(
SetAddrPort(test_addr_v6_any.family(), &addr_v6_any, ephemeral_port));
const FileDescriptor fd_v6_any = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v6_any.family(), param.type, 0));
ASSERT_THAT(bind(fd_v6_any.get(), AsSockAddr(&addr_v6_any),
test_addr_v6_any.addr_len),
SyscallFailsWithErrno(EADDRINUSE));
// For some reason, binding the TCP v6-only any is flaky on Linux. Maybe we
// tend to run out of ephemeral ports? Regardless, binding the v6 loopback
// seems pretty reliable. Only try to bind the v6-only any on UDP and
// gVisor.
int ret = -1;
if (!IsRunningOnGvisor() && param.type == SOCK_STREAM) {
// Verify that we can still bind the v6 loopback on the same port.
TestAddress const& test_addr_v6 = V6Loopback();
sockaddr_storage addr_v6 = test_addr_v6.addr;
ASSERT_NO_ERRNO(
SetAddrPort(test_addr_v6.family(), &addr_v6, ephemeral_port));
const FileDescriptor fd_v6 = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v6.family(), param.type, 0));
ret = bind(fd_v6.get(), AsSockAddr(&addr_v6), test_addr_v6.addr_len);
} else {
// Verify that we can still bind the v6 any on the same port with a
// v6-only socket.
const FileDescriptor fd_v6_only_any = ASSERT_NO_ERRNO_AND_VALUE(
Socket(test_addr_v6_any.family(), param.type, 0));
EXPECT_THAT(setsockopt(fd_v6_only_any.get(), IPPROTO_IPV6, IPV6_V6ONLY,
&kSockOptOn, sizeof(kSockOptOn)),
SyscallSucceeds());
ret = bind(fd_v6_only_any.get(), AsSockAddr(&addr_v6_any),
test_addr_v6_any.addr_len);
}
if (ret == -1 && errno == EADDRINUSE) {
// Port may have been in use.
ASSERT_LT(i, 100); // Give up after 100 tries.
continue;
}
EXPECT_THAT(ret, SyscallSucceeds());
// No need to try again.
break;
}
}
TEST_P(SocketMultiProtocolInetLoopbackTest,
MultipleBindsAllowedNoListeningReuseAddr) {
ProtocolTestParam const& param = GetParam();
// UDP sockets are allowed to bind/listen on the port w/ SO_REUSEADDR, for TCP
// this is only permitted if there is no other listening socket.
SKIP_IF(param.type != SOCK_STREAM);
// Bind the v4 loopback on a v4 socket.
const TestAddress& test_addr = V4Loopback();
sockaddr_storage bound_addr = test_addr.addr;
FileDescriptor bound_fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
ASSERT_THAT(setsockopt(bound_fd.get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn,
sizeof(kSockOptOn)),
SyscallSucceeds());
ASSERT_THAT(bind(bound_fd.get(), AsSockAddr(&bound_addr), test_addr.addr_len),
SyscallSucceeds());
// Get the port that we bound.
socklen_t bound_addr_len = test_addr.addr_len;
ASSERT_THAT(
getsockname(bound_fd.get(), AsSockAddr(&bound_addr), &bound_addr_len),
SyscallSucceeds());
// Now create a socket and bind it to the same port, this should
// succeed since there is no listening socket for the same port.
FileDescriptor second_fd =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
ASSERT_THAT(setsockopt(second_fd.get(), SOL_SOCKET, SO_REUSEADDR, &kSockOptOn,
sizeof(kSockOptOn)),
SyscallSucceeds());
ASSERT_THAT(
bind(second_fd.get(), AsSockAddr(&bound_addr), test_addr.addr_len),
SyscallSucceeds());
}
TEST_P(SocketMultiProtocolInetLoopbackTest, PortReuseTwoSockets) {
ProtocolTestParam const& param = GetParam();
TestAddress const& test_addr = V4Loopback();
sockaddr_storage addr = test_addr.addr;
for (int i = 0; i < 2; i++) {
const int portreuse1 = i % 2;
auto s1 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
int fd1 = s1.get();
socklen_t addrlen = test_addr.addr_len;
EXPECT_THAT(
setsockopt(fd1, SOL_SOCKET, SO_REUSEPORT, &portreuse1, sizeof(int)),
SyscallSucceeds());
ASSERT_THAT(bind(fd1, AsSockAddr(&addr), addrlen), SyscallSucceeds());
ASSERT_THAT(getsockname(fd1, AsSockAddr(&addr), &addrlen),
SyscallSucceeds());
if (param.type == SOCK_STREAM) {
ASSERT_THAT(listen(fd1, 1), SyscallSucceeds());
}
// j is less than 4 to check that the port reuse logic works correctly after
// closing bound sockets.
for (int j = 0; j < 4; j++) {
const int portreuse2 = j % 2;
auto s2 =
ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
int fd2 = s2.get();
EXPECT_THAT(
setsockopt(fd2, SOL_SOCKET, SO_REUSEPORT, &portreuse2, sizeof(int)),
SyscallSucceeds());
std::cout << portreuse1 << " " << portreuse2 << std::endl;
int ret = bind(fd2, AsSockAddr(&addr), addrlen);
// Verify that two sockets can be bound to the same port only if
// SO_REUSEPORT is set for both of them.
if (!portreuse1 || !portreuse2) {
ASSERT_THAT(ret, SyscallFailsWithErrno(EADDRINUSE));
} else {
ASSERT_THAT(ret, SyscallSucceeds());
}
}
}
}
// Check that when a socket was bound to an address with REUSEPORT and then
// closed, we can bind a different socket to the same address without needing
// REUSEPORT.
TEST_P(SocketMultiProtocolInetLoopbackTest, NoReusePortFollowingReusePort) {
ProtocolTestParam const& param = GetParam();
TestAddress const& test_addr = V4Loopback();
sockaddr_storage addr = test_addr.addr;
auto s = ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
int fd = s.get();
socklen_t addrlen = test_addr.addr_len;
int portreuse = 1;
ASSERT_THAT(
setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &portreuse, sizeof(portreuse)),
SyscallSucceeds());
ASSERT_THAT(bind(fd, AsSockAddr(&addr), addrlen), SyscallSucceeds());
ASSERT_THAT(getsockname(fd, AsSockAddr(&addr), &addrlen), SyscallSucceeds());
ASSERT_EQ(addrlen, test_addr.addr_len);
s.reset();
// Open a new socket and bind to the same address, but w/o REUSEPORT.
s = ASSERT_NO_ERRNO_AND_VALUE(Socket(test_addr.family(), param.type, 0));
fd = s.get();
portreuse = 0;
ASSERT_THAT(
setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &portreuse, sizeof(portreuse)),
SyscallSucceeds());
ASSERT_THAT(bind(fd, AsSockAddr(&addr), addrlen), SyscallSucceeds());
}
INSTANTIATE_TEST_SUITE_P(AllFamilies, SocketMultiProtocolInetLoopbackTest,
ProtocolTestValues(), DescribeProtocolTestParam);
} // namespace
// Check that loopback receives connections from any address in the range:
// 127.0.0.1 to 127.254.255.255. This behavior is exclusive to IPv4.
TEST_F(SocketInetLoopbackTest, LoopbackAddressRangeConnect) {
TestAddress const& listener = V4Any();
in_addr_t addresses[] = {
INADDR_LOOPBACK,
INADDR_LOOPBACK + 1, // 127.0.0.2
(in_addr_t)0x7f000101, // 127.0.1.1
(in_addr_t)0x7f010101, // 127.1.1.1
(in_addr_t)0x7ffeffff, // 127.254.255.255
};
for (const auto& address : addresses) {
TestAddress connector("V4Loopback");
connector.addr.ss_family = AF_INET;
connector.addr_len = sizeof(sockaddr_in);
reinterpret_cast<sockaddr_in*>(&connector.addr)->sin_addr.s_addr =
htonl(address);
tcpSimpleConnectTest(listener, connector, true);
}
}
} // namespace testing
} // namespace gvisor