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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 <arpa/inet.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <string.h>
#include <iostream>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/strings/str_cat.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"
namespace gvisor {
namespace testing {
namespace {
using SocketInetLoopbackTest = ::testing::TestWithParam<SocketInetTestParam>;
// This test verifies that connect returns EADDRNOTAVAIL if all local ephemeral
// ports are already in use for a given destination ip/port.
//
// We disable S/R because this test creates a large number of sockets.
//
// FIXME(b/162475855): This test is failing reliably.
TEST_P(SocketInetLoopbackTest, DISABLED_TestTCPPortExhaustion) {
SocketInetTestParam const& param = GetParam();
TestAddress const& listener = param.listener;
TestAddress const& connector = param.connector;
constexpr int kBacklog = 10;
constexpr int kClients = 65536;
// Create the listening socket.
auto 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));
// Disable cooperative S/R as we are making too many syscalls.
DisableSave ds;
// Now we keep opening connections till we run out of local ephemeral ports.
// and assert the error we get back.
sockaddr_storage conn_addr = connector.addr;
ASSERT_NO_ERRNO(SetAddrPort(connector.family(), &conn_addr, port));
std::vector<FileDescriptor> clients;
std::vector<FileDescriptor> servers;
for (int i = 0; i < kClients; i++) {
FileDescriptor client = ASSERT_NO_ERRNO_AND_VALUE(
Socket(connector.family(), SOCK_STREAM, IPPROTO_TCP));
int ret = connect(client.get(), AsSockAddr(&conn_addr), connector.addr_len);
if (ret == 0) {
clients.push_back(std::move(client));
FileDescriptor server =
ASSERT_NO_ERRNO_AND_VALUE(Accept(listen_fd.get(), nullptr, nullptr));
servers.push_back(std::move(server));
continue;
}
ASSERT_THAT(ret, SyscallFailsWithErrno(EADDRNOTAVAIL));
break;
}
}
INSTANTIATE_TEST_SUITE_P(All, SocketInetLoopbackTest,
SocketInetLoopbackTestValues(),
DescribeSocketInetTestParam);
using SocketMultiProtocolInetLoopbackTest =
::testing::TestWithParam<ProtocolTestParam>;
TEST_P(SocketMultiProtocolInetLoopbackTest,
TCPBindAvoidsOtherBoundPortsReuseAddr) {
ProtocolTestParam const& param = GetParam();
// UDP sockets are allowed to bind/listen on an already bound port w/
// SO_REUSEADDR even when requesting a port from the kernel. In case of TCP
// rebinding is only permitted when SO_REUSEADDR is set and an explicit port
// is specified. When a zero port is specified to the bind() call then an
// already bound port will not be picked.
SKIP_IF(param.type != SOCK_STREAM);
DisableSave ds; // Too many syscalls.
// A map of port to file descriptor binding the port.
std::map<uint16_t, FileDescriptor> bound_sockets;
// Reduce number of ephemeral ports if permitted to reduce running time of
// the test.
[[maybe_unused]] const int nports =
ASSERT_NO_ERRNO_AND_VALUE(MaybeLimitEphemeralPorts());
// Exhaust all ephemeral ports.
while (true) {
// Bind the v4 loopback on a v4 socket.
TestAddress const& 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());
int ret = bind(bound_fd.get(), AsSockAddr(&bound_addr), test_addr.addr_len);
if (ret != 0) {
ASSERT_EQ(errno, EADDRINUSE);
break;
}
// 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());
uint16_t port = reinterpret_cast<sockaddr_in*>(&bound_addr)->sin_port;
auto [iter, inserted] = bound_sockets.emplace(port, std::move(bound_fd));
ASSERT_TRUE(inserted);
}
}
TEST_P(SocketMultiProtocolInetLoopbackTest,
UDPBindMayBindOtherBoundPortsReuseAddr) {
ProtocolTestParam const& param = GetParam();
// UDP sockets are allowed to bind/listen on an already bound port w/
// SO_REUSEADDR even when requesting a port from the kernel.
SKIP_IF(param.type != SOCK_DGRAM);
DisableSave ds; // Too many syscalls.
// A map of port to file descriptor binding the port.
std::map<uint16_t, FileDescriptor> bound_sockets;
// Reduce number of ephemeral ports if permitted to reduce running time of
// the test.
[[maybe_unused]] const int nports =
ASSERT_NO_ERRNO_AND_VALUE(MaybeLimitEphemeralPorts());
// Exhaust all ephemeral ports.
bool duplicate_binding = false;
while (true) {
// Bind the v4 loopback on a v4 socket.
TestAddress const& 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());
uint16_t port = reinterpret_cast<sockaddr_in*>(&bound_addr)->sin_port;
auto [iter, inserted] = bound_sockets.emplace(port, std::move(bound_fd));
if (!inserted) {
duplicate_binding = true;
break;
}
}
ASSERT_TRUE(duplicate_binding);
}
INSTANTIATE_TEST_SUITE_P(AllFamilies, SocketMultiProtocolInetLoopbackTest,
ProtocolTestValues(), DescribeProtocolTestParam);
} // namespace
} // namespace testing
} // namespace gvisor
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