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| //===-- TCPSocket.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
//
//===----------------------------------------------------------------------===//
#if defined(_MSC_VER)
#define _WINSOCK_DEPRECATED_NO_WARNINGS
#endif
#include "lldb/Host/common/TCPSocket.h"
#include "lldb/Host/Config.h"
#include "lldb/Host/MainLoop.h"
#include "lldb/Utility/Log.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/Support/Errno.h"
#include "llvm/Support/raw_ostream.h"
#ifndef LLDB_DISABLE_POSIX
#include <arpa/inet.h>
#include <netinet/tcp.h>
#include <sys/socket.h>
#endif
#if defined(_WIN32)
#include <winsock2.h>
#endif
#ifdef _WIN32
#define CLOSE_SOCKET closesocket
typedef const char *set_socket_option_arg_type;
#else
#include <unistd.h>
#define CLOSE_SOCKET ::close
typedef const void *set_socket_option_arg_type;
#endif
using namespace lldb;
using namespace lldb_private;
namespace {
const int kType = SOCK_STREAM;
}
TCPSocket::TCPSocket(bool should_close, bool child_processes_inherit)
: Socket(ProtocolTcp, should_close, child_processes_inherit) {}
TCPSocket::TCPSocket(NativeSocket socket, const TCPSocket &listen_socket)
: Socket(ProtocolTcp, listen_socket.m_should_close_fd,
listen_socket.m_child_processes_inherit) {
m_socket = socket;
}
TCPSocket::TCPSocket(NativeSocket socket, bool should_close,
bool child_processes_inherit)
: Socket(ProtocolTcp, should_close, child_processes_inherit) {
m_socket = socket;
}
TCPSocket::~TCPSocket() { CloseListenSockets(); }
bool TCPSocket::IsValid() const {
return m_socket != kInvalidSocketValue || m_listen_sockets.size() != 0;
}
// Return the port number that is being used by the socket.
uint16_t TCPSocket::GetLocalPortNumber() const {
if (m_socket != kInvalidSocketValue) {
SocketAddress sock_addr;
socklen_t sock_addr_len = sock_addr.GetMaxLength();
if (::getsockname(m_socket, sock_addr, &sock_addr_len) == 0)
return sock_addr.GetPort();
} else if (!m_listen_sockets.empty()) {
SocketAddress sock_addr;
socklen_t sock_addr_len = sock_addr.GetMaxLength();
if (::getsockname(m_listen_sockets.begin()->first, sock_addr,
&sock_addr_len) == 0)
return sock_addr.GetPort();
}
return 0;
}
std::string TCPSocket::GetLocalIPAddress() const {
// We bound to port zero, so we need to figure out which port we actually
// bound to
if (m_socket != kInvalidSocketValue) {
SocketAddress sock_addr;
socklen_t sock_addr_len = sock_addr.GetMaxLength();
if (::getsockname(m_socket, sock_addr, &sock_addr_len) == 0)
return sock_addr.GetIPAddress();
}
return "";
}
uint16_t TCPSocket::GetRemotePortNumber() const {
if (m_socket != kInvalidSocketValue) {
SocketAddress sock_addr;
socklen_t sock_addr_len = sock_addr.GetMaxLength();
if (::getpeername(m_socket, sock_addr, &sock_addr_len) == 0)
return sock_addr.GetPort();
}
return 0;
}
std::string TCPSocket::GetRemoteIPAddress() const {
// We bound to port zero, so we need to figure out which port we actually
// bound to
if (m_socket != kInvalidSocketValue) {
SocketAddress sock_addr;
socklen_t sock_addr_len = sock_addr.GetMaxLength();
if (::getpeername(m_socket, sock_addr, &sock_addr_len) == 0)
return sock_addr.GetIPAddress();
}
return "";
}
std::string TCPSocket::GetRemoteConnectionURI() const {
if (m_socket != kInvalidSocketValue) {
return llvm::formatv("connect://[{0}]:{1}", GetRemoteIPAddress(),
GetRemotePortNumber());
}
return "";
}
Status TCPSocket::CreateSocket(int domain) {
Status error;
if (IsValid())
error = Close();
if (error.Fail())
return error;
m_socket = Socket::CreateSocket(domain, kType, IPPROTO_TCP,
m_child_processes_inherit, error);
return error;
}
Status TCPSocket::Connect(llvm::StringRef name) {
Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_COMMUNICATION));
LLDB_LOGF(log, "TCPSocket::%s (host/port = %s)", __FUNCTION__, name.data());
Status error;
std::string host_str;
std::string port_str;
int32_t port = INT32_MIN;
if (!DecodeHostAndPort(name, host_str, port_str, port, &error))
return error;
auto addresses = lldb_private::SocketAddress::GetAddressInfo(
host_str.c_str(), nullptr, AF_UNSPEC, SOCK_STREAM, IPPROTO_TCP);
for (auto address : addresses) {
error = CreateSocket(address.GetFamily());
if (error.Fail())
continue;
address.SetPort(port);
if (-1 == llvm::sys::RetryAfterSignal(-1, ::connect,
GetNativeSocket(), &address.sockaddr(), address.GetLength())) {
CLOSE_SOCKET(GetNativeSocket());
continue;
}
SetOptionNoDelay();
error.Clear();
return error;
}
error.SetErrorString("Failed to connect port");
return error;
}
Status TCPSocket::Listen(llvm::StringRef name, int backlog) {
Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_CONNECTION));
LLDB_LOGF(log, "TCPSocket::%s (%s)", __FUNCTION__, name.data());
Status error;
std::string host_str;
std::string port_str;
int32_t port = INT32_MIN;
if (!DecodeHostAndPort(name, host_str, port_str, port, &error))
return error;
if (host_str == "*")
host_str = "0.0.0.0";
auto addresses = lldb_private::SocketAddress::GetAddressInfo(
host_str.c_str(), nullptr, AF_UNSPEC, SOCK_STREAM, IPPROTO_TCP);
for (auto address : addresses) {
int fd = Socket::CreateSocket(address.GetFamily(), kType, IPPROTO_TCP,
m_child_processes_inherit, error);
if (error.Fail()) {
error.Clear();
continue;
}
// enable local address reuse
int option_value = 1;
set_socket_option_arg_type option_value_p =
reinterpret_cast<set_socket_option_arg_type>(&option_value);
::setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, option_value_p,
sizeof(option_value));
SocketAddress listen_address = address;
if(!listen_address.IsLocalhost())
listen_address.SetToAnyAddress(address.GetFamily(), port);
else
listen_address.SetPort(port);
int err =
::bind(fd, &listen_address.sockaddr(), listen_address.GetLength());
if (-1 != err)
err = ::listen(fd, backlog);
if (-1 == err) {
CLOSE_SOCKET(fd);
continue;
}
if (port == 0) {
socklen_t sa_len = address.GetLength();
if (getsockname(fd, &address.sockaddr(), &sa_len) == 0)
port = address.GetPort();
}
m_listen_sockets[fd] = address;
}
if (m_listen_sockets.size() == 0)
error.SetErrorString("Failed to connect port");
return error;
}
void TCPSocket::CloseListenSockets() {
for (auto socket : m_listen_sockets)
CLOSE_SOCKET(socket.first);
m_listen_sockets.clear();
}
Status TCPSocket::Accept(Socket *&conn_socket) {
Status error;
if (m_listen_sockets.size() == 0) {
error.SetErrorString("No open listening sockets!");
return error;
}
int sock = -1;
int listen_sock = -1;
lldb_private::SocketAddress AcceptAddr;
MainLoop accept_loop;
std::vector<MainLoopBase::ReadHandleUP> handles;
for (auto socket : m_listen_sockets) {
auto fd = socket.first;
auto inherit = this->m_child_processes_inherit;
auto io_sp = IOObjectSP(new TCPSocket(socket.first, false, inherit));
handles.emplace_back(accept_loop.RegisterReadObject(
io_sp, [fd, inherit, &sock, &AcceptAddr, &error,
&listen_sock](MainLoopBase &loop) {
socklen_t sa_len = AcceptAddr.GetMaxLength();
sock = AcceptSocket(fd, &AcceptAddr.sockaddr(), &sa_len, inherit,
error);
listen_sock = fd;
loop.RequestTermination();
}, error));
if (error.Fail())
return error;
}
bool accept_connection = false;
std::unique_ptr<TCPSocket> accepted_socket;
// Loop until we are happy with our connection
while (!accept_connection) {
accept_loop.Run();
if (error.Fail())
return error;
lldb_private::SocketAddress &AddrIn = m_listen_sockets[listen_sock];
if (!AddrIn.IsAnyAddr() && AcceptAddr != AddrIn) {
CLOSE_SOCKET(sock);
llvm::errs() << llvm::formatv(
"error: rejecting incoming connection from {0} (expecting {1})",
AcceptAddr.GetIPAddress(), AddrIn.GetIPAddress());
continue;
}
accept_connection = true;
accepted_socket.reset(new TCPSocket(sock, *this));
}
if (!accepted_socket)
return error;
// Keep our TCP packets coming without any delays.
accepted_socket->SetOptionNoDelay();
error.Clear();
conn_socket = accepted_socket.release();
return error;
}
int TCPSocket::SetOptionNoDelay() {
return SetOption(IPPROTO_TCP, TCP_NODELAY, 1);
}
int TCPSocket::SetOptionReuseAddress() {
return SetOption(SOL_SOCKET, SO_REUSEADDR, 1);
}
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