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llvm-project/lldb/unittests/Host/SocketTest.cpp
Michal Gorny f6e5594e81 [lldb] [unittest] Avoid mixing '127.0.0.1' and 'localhost' 
Fix the tests not to use '127.0.0.1' and 'localhost' interchangeably.
More specifically, since tests bind specifically to 127.0.0.1, connect
to that address as well; using 'localhost' can resolve to IPv6 address
which can cause issues -- for example, if the matching port happens to
be used by some other process, the tests hang forever waiting for
the client to connect.

While technically the case of randomly selected IPv4 port being taken
on IPv6 loopback is not very likely, NetBSD happens to be suffering from
some weird kernel issue where connection to that port succeeds
nevertheless.  Until we can really figure out what goes wrong there,
this saves us from the tests hanging randomly.

Differential Revision: https://reviews.llvm.org/D58131

llvm-svn: 353868
2019-02-12 18:09:00 +00:00

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//===-- SocketTest.cpp ------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include <cstdio>
#include <functional>
#include <thread>
#include "gtest/gtest.h"
#include "lldb/Host/Config.h"
#include "lldb/Host/Socket.h"
#include "lldb/Host/common/TCPSocket.h"
#include "lldb/Host/common/UDPSocket.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#ifndef LLDB_DISABLE_POSIX
#include "lldb/Host/posix/DomainSocket.h"
#endif
using namespace lldb_private;
class SocketTest : public testing::Test {
public:
void SetUp() override {
#if defined(_MSC_VER)
WSADATA data;
::WSAStartup(MAKEWORD(2, 2), &data);
#endif
}
void TearDown() override {
#if defined(_MSC_VER)
::WSACleanup();
#endif
}
protected:
static void AcceptThread(Socket *listen_socket,
bool child_processes_inherit, Socket **accept_socket,
Status *error) {
*error = listen_socket->Accept(*accept_socket);
}
template <typename SocketType>
void CreateConnectedSockets(
llvm::StringRef listen_remote_address,
const std::function<std::string(const SocketType &)> &get_connect_addr,
std::unique_ptr<SocketType> *a_up, std::unique_ptr<SocketType> *b_up) {
bool child_processes_inherit = false;
Status error;
std::unique_ptr<SocketType> listen_socket_up(
new SocketType(true, child_processes_inherit));
EXPECT_FALSE(error.Fail());
error = listen_socket_up->Listen(listen_remote_address, 5);
EXPECT_FALSE(error.Fail());
EXPECT_TRUE(listen_socket_up->IsValid());
Status accept_error;
Socket *accept_socket;
std::thread accept_thread(AcceptThread, listen_socket_up.get(),
child_processes_inherit, &accept_socket,
&accept_error);
std::string connect_remote_address = get_connect_addr(*listen_socket_up);
std::unique_ptr<SocketType> connect_socket_up(
new SocketType(true, child_processes_inherit));
EXPECT_FALSE(error.Fail());
error = connect_socket_up->Connect(connect_remote_address);
EXPECT_FALSE(error.Fail());
EXPECT_TRUE(connect_socket_up->IsValid());
a_up->swap(connect_socket_up);
EXPECT_TRUE(error.Success());
EXPECT_NE(nullptr, a_up->get());
EXPECT_TRUE((*a_up)->IsValid());
accept_thread.join();
b_up->reset(static_cast<SocketType *>(accept_socket));
EXPECT_TRUE(accept_error.Success());
EXPECT_NE(nullptr, b_up->get());
EXPECT_TRUE((*b_up)->IsValid());
listen_socket_up.reset();
}
};
TEST_F(SocketTest, DecodeHostAndPort) {
std::string host_str;
std::string port_str;
int32_t port;
Status error;
EXPECT_TRUE(Socket::DecodeHostAndPort("localhost:1138", host_str, port_str,
port, &error));
EXPECT_STREQ("localhost", host_str.c_str());
EXPECT_STREQ("1138", port_str.c_str());
EXPECT_EQ(1138, port);
EXPECT_TRUE(error.Success());
EXPECT_FALSE(Socket::DecodeHostAndPort("google.com:65536", host_str, port_str,
port, &error));
EXPECT_TRUE(error.Fail());
EXPECT_STREQ("invalid host:port specification: 'google.com:65536'",
error.AsCString());
EXPECT_FALSE(Socket::DecodeHostAndPort("google.com:-1138", host_str, port_str,
port, &error));
EXPECT_TRUE(error.Fail());
EXPECT_STREQ("invalid host:port specification: 'google.com:-1138'",
error.AsCString());
EXPECT_FALSE(Socket::DecodeHostAndPort("google.com:65536", host_str, port_str,
port, &error));
EXPECT_TRUE(error.Fail());
EXPECT_STREQ("invalid host:port specification: 'google.com:65536'",
error.AsCString());
EXPECT_TRUE(
Socket::DecodeHostAndPort("12345", host_str, port_str, port, &error));
EXPECT_STREQ("", host_str.c_str());
EXPECT_STREQ("12345", port_str.c_str());
EXPECT_EQ(12345, port);
EXPECT_TRUE(error.Success());
EXPECT_TRUE(
Socket::DecodeHostAndPort("*:0", host_str, port_str, port, &error));
EXPECT_STREQ("*", host_str.c_str());
EXPECT_STREQ("0", port_str.c_str());
EXPECT_EQ(0, port);
EXPECT_TRUE(error.Success());
EXPECT_TRUE(
Socket::DecodeHostAndPort("*:65535", host_str, port_str, port, &error));
EXPECT_STREQ("*", host_str.c_str());
EXPECT_STREQ("65535", port_str.c_str());
EXPECT_EQ(65535, port);
EXPECT_TRUE(error.Success());
EXPECT_TRUE(
Socket::DecodeHostAndPort("[::1]:12345", host_str, port_str, port, &error));
EXPECT_STREQ("::1", host_str.c_str());
EXPECT_STREQ("12345", port_str.c_str());
EXPECT_EQ(12345, port);
EXPECT_TRUE(error.Success());
EXPECT_TRUE(
Socket::DecodeHostAndPort("[abcd:12fg:AF58::1]:12345", host_str, port_str, port, &error));
EXPECT_STREQ("abcd:12fg:AF58::1", host_str.c_str());
EXPECT_STREQ("12345", port_str.c_str());
EXPECT_EQ(12345, port);
EXPECT_TRUE(error.Success());
}
#ifndef LLDB_DISABLE_POSIX
TEST_F(SocketTest, DomainListenConnectAccept) {
llvm::SmallString<64> Path;
std::error_code EC = llvm::sys::fs::createUniqueDirectory("DomainListenConnectAccept", Path);
ASSERT_FALSE(EC);
llvm::sys::path::append(Path, "test");
std::unique_ptr<DomainSocket> socket_a_up;
std::unique_ptr<DomainSocket> socket_b_up;
CreateConnectedSockets<DomainSocket>(
Path, [=](const DomainSocket &) { return Path.str().str(); },
&socket_a_up, &socket_b_up);
}
#endif
TEST_F(SocketTest, TCPListen0ConnectAccept) {
std::unique_ptr<TCPSocket> socket_a_up;
std::unique_ptr<TCPSocket> socket_b_up;
CreateConnectedSockets<TCPSocket>(
"127.0.0.1:0",
[=](const TCPSocket &s) {
char connect_remote_address[64];
snprintf(connect_remote_address, sizeof(connect_remote_address),
"127.0.0.1:%u", s.GetLocalPortNumber());
return std::string(connect_remote_address);
},
&socket_a_up, &socket_b_up);
}
TEST_F(SocketTest, TCPGetAddress) {
std::unique_ptr<TCPSocket> socket_a_up;
std::unique_ptr<TCPSocket> socket_b_up;
CreateConnectedSockets<TCPSocket>(
"127.0.0.1:0",
[=](const TCPSocket &s) {
char connect_remote_address[64];
snprintf(connect_remote_address, sizeof(connect_remote_address),
"127.0.0.1:%u", s.GetLocalPortNumber());
return std::string(connect_remote_address);
},
&socket_a_up, &socket_b_up);
EXPECT_EQ(socket_a_up->GetLocalPortNumber(),
socket_b_up->GetRemotePortNumber());
EXPECT_EQ(socket_b_up->GetLocalPortNumber(),
socket_a_up->GetRemotePortNumber());
EXPECT_NE(socket_a_up->GetLocalPortNumber(),
socket_b_up->GetLocalPortNumber());
EXPECT_STREQ("127.0.0.1", socket_a_up->GetRemoteIPAddress().c_str());
EXPECT_STREQ("127.0.0.1", socket_b_up->GetRemoteIPAddress().c_str());
}
TEST_F(SocketTest, UDPConnect) {
Socket *socket;
bool child_processes_inherit = false;
auto error = UDPSocket::Connect("127.0.0.1:0", child_processes_inherit,
socket);
std::unique_ptr<Socket> socket_up(socket);
EXPECT_TRUE(error.Success());
EXPECT_TRUE(socket_up->IsValid());
}
TEST_F(SocketTest, TCPListen0GetPort) {
Socket *server_socket;
Predicate<uint16_t> port_predicate;
port_predicate.SetValue(0, eBroadcastNever);
Status err =
Socket::TcpListen("10.10.12.3:0", false, server_socket, &port_predicate);
std::unique_ptr<TCPSocket> socket_up((TCPSocket*)server_socket);
EXPECT_TRUE(socket_up->IsValid());
EXPECT_NE(socket_up->GetLocalPortNumber(), 0);
}
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