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//===-- UDPSocket.cpp -----------------------------------------------------===//
//
// 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 "lldb/Host/common/UDPSocket.h"
#include "lldb/Host/Config.h"
#include "lldb/Utility/LLDBLog.h"
#include "lldb/Utility/Log.h"
#if LLDB_ENABLE_POSIX
#include <arpa/inet.h>
#include <sys/socket.h>
#endif
#include <memory>
using namespace lldb;
using namespace lldb_private;
static const int kDomain = AF_INET;
static const int kType = SOCK_DGRAM;
static const char *g_not_supported_error = "Not supported";
UDPSocket::UDPSocket(NativeSocket socket)
: Socket(ProtocolUdp, /*should_close=*/true) {
m_socket = socket;
}
UDPSocket::UDPSocket(bool should_close) : Socket(ProtocolUdp, should_close) {}
size_t UDPSocket::Send(const void *buf, const size_t num_bytes) {
return ::sendto(m_socket, static_cast<const char *>(buf), num_bytes, 0,
m_sockaddr, m_sockaddr.GetLength());
}
Status UDPSocket::Connect(llvm::StringRef name) {
return Status::FromErrorStringWithFormat("%s", g_not_supported_error);
}
Status UDPSocket::Listen(llvm::StringRef name, int backlog) {
return Status::FromErrorStringWithFormat("%s", g_not_supported_error);
}
llvm::Expected<std::unique_ptr<UDPSocket>>
UDPSocket::CreateConnected(llvm::StringRef name) {
std::unique_ptr<UDPSocket> socket;
Log *log = GetLog(LLDBLog::Connection);
LLDB_LOG(log, "host/port = {0}", name);
Status error;
llvm::Expected<HostAndPort> host_port = DecodeHostAndPort(name);
if (!host_port)
return host_port.takeError();
// At this point we have setup the receive port, now we need to setup the UDP
// send socket
struct addrinfo hints;
struct addrinfo *service_info_list = nullptr;
::memset(&hints, 0, sizeof(hints));
hints.ai_family = kDomain;
hints.ai_socktype = kType;
int err = ::getaddrinfo(host_port->hostname.c_str(), std::to_string(host_port->port).c_str(), &hints,
&service_info_list);
if (err != 0) {
error = Status::FromErrorStringWithFormat(
#if defined(_WIN32) && defined(UNICODE)
"getaddrinfo(%s, %d, &hints, &info) returned error %i (%S)",
#else
"getaddrinfo(%s, %d, &hints, &info) returned error %i (%s)",
#endif
host_port->hostname.c_str(), host_port->port, err, gai_strerror(err));
return error.ToError();
}
for (struct addrinfo *service_info_ptr = service_info_list;
service_info_ptr != nullptr;
service_info_ptr = service_info_ptr->ai_next) {
auto send_fd =
CreateSocket(service_info_ptr->ai_family, service_info_ptr->ai_socktype,
service_info_ptr->ai_protocol, error);
if (error.Success()) {
socket.reset(new UDPSocket(send_fd));
socket->m_sockaddr = service_info_ptr;
break;
} else
continue;
}
::freeaddrinfo(service_info_list);
if (!socket)
return error.ToError();
SocketAddress bind_addr;
// Only bind to the loopback address if we are expecting a connection from
// localhost to avoid any firewall issues.
const bool bind_addr_success = (host_port->hostname == "127.0.0.1" || host_port->hostname == "localhost")
? bind_addr.SetToLocalhost(kDomain, host_port->port)
: bind_addr.SetToAnyAddress(kDomain, host_port->port);
if (!bind_addr_success) {
error = Status::FromErrorString("Failed to get hostspec to bind for");
return error.ToError();
}
bind_addr.SetPort(0); // Let the source port # be determined dynamically
err = ::bind(socket->GetNativeSocket(), bind_addr, bind_addr.GetLength());
struct sockaddr_in source_info;
socklen_t address_len = sizeof (struct sockaddr_in);
err = ::getsockname(socket->GetNativeSocket(),
(struct sockaddr *)&source_info, &address_len);
return std::move(socket);
}
std::string UDPSocket::GetRemoteConnectionURI() const {
if (m_socket != kInvalidSocketValue) {
return std::string(llvm::formatv(
"udp://[{0}]:{1}", m_sockaddr.GetIPAddress(), m_sockaddr.GetPort()));
}
return "";
}
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