1 //===-- UDPSocket.cpp -----------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "lldb/Host/common/UDPSocket.h" 10 11 #include "lldb/Host/Config.h" 12 #include "lldb/Utility/LLDBLog.h" 13 #include "lldb/Utility/Log.h" 14 15 #if LLDB_ENABLE_POSIX 16 #include <arpa/inet.h> 17 #include <sys/socket.h> 18 #endif 19 20 #include <memory> 21 22 using namespace lldb; 23 using namespace lldb_private; 24 25 static const int kDomain = AF_INET; 26 static const int kType = SOCK_DGRAM; 27 28 static const char *g_not_supported_error = "Not supported"; 29 30 UDPSocket::UDPSocket(NativeSocket socket) 31 : Socket(ProtocolUdp, /*should_close=*/true) { 32 m_socket = socket; 33 } 34 35 UDPSocket::UDPSocket(bool should_close) : Socket(ProtocolUdp, should_close) {} 36 37 size_t UDPSocket::Send(const void *buf, const size_t num_bytes) { 38 return ::sendto(m_socket, static_cast<const char *>(buf), num_bytes, 0, 39 m_sockaddr, m_sockaddr.GetLength()); 40 } 41 42 Status UDPSocket::Connect(llvm::StringRef name) { 43 return Status::FromErrorStringWithFormat("%s", g_not_supported_error); 44 } 45 46 Status UDPSocket::Listen(llvm::StringRef name, int backlog) { 47 return Status::FromErrorStringWithFormat("%s", g_not_supported_error); 48 } 49 50 llvm::Expected<std::unique_ptr<UDPSocket>> 51 UDPSocket::CreateConnected(llvm::StringRef name) { 52 std::unique_ptr<UDPSocket> socket; 53 54 Log *log = GetLog(LLDBLog::Connection); 55 LLDB_LOG(log, "host/port = {0}", name); 56 57 Status error; 58 llvm::Expected<HostAndPort> host_port = DecodeHostAndPort(name); 59 if (!host_port) 60 return host_port.takeError(); 61 62 // At this point we have setup the receive port, now we need to setup the UDP 63 // send socket 64 65 struct addrinfo hints; 66 struct addrinfo *service_info_list = nullptr; 67 68 ::memset(&hints, 0, sizeof(hints)); 69 hints.ai_family = kDomain; 70 hints.ai_socktype = kType; 71 int err = ::getaddrinfo(host_port->hostname.c_str(), std::to_string(host_port->port).c_str(), &hints, 72 &service_info_list); 73 if (err != 0) { 74 error = Status::FromErrorStringWithFormat( 75 #if defined(_WIN32) && defined(UNICODE) 76 "getaddrinfo(%s, %d, &hints, &info) returned error %i (%S)", 77 #else 78 "getaddrinfo(%s, %d, &hints, &info) returned error %i (%s)", 79 #endif 80 host_port->hostname.c_str(), host_port->port, err, gai_strerror(err)); 81 return error.ToError(); 82 } 83 84 for (struct addrinfo *service_info_ptr = service_info_list; 85 service_info_ptr != nullptr; 86 service_info_ptr = service_info_ptr->ai_next) { 87 auto send_fd = 88 CreateSocket(service_info_ptr->ai_family, service_info_ptr->ai_socktype, 89 service_info_ptr->ai_protocol, error); 90 if (error.Success()) { 91 socket.reset(new UDPSocket(send_fd)); 92 socket->m_sockaddr = service_info_ptr; 93 break; 94 } else 95 continue; 96 } 97 98 ::freeaddrinfo(service_info_list); 99 100 if (!socket) 101 return error.ToError(); 102 103 SocketAddress bind_addr; 104 105 // Only bind to the loopback address if we are expecting a connection from 106 // localhost to avoid any firewall issues. 107 const bool bind_addr_success = (host_port->hostname == "127.0.0.1" || host_port->hostname == "localhost") 108 ? bind_addr.SetToLocalhost(kDomain, host_port->port) 109 : bind_addr.SetToAnyAddress(kDomain, host_port->port); 110 111 if (!bind_addr_success) { 112 error = Status::FromErrorString("Failed to get hostspec to bind for"); 113 return error.ToError(); 114 } 115 116 bind_addr.SetPort(0); // Let the source port # be determined dynamically 117 118 err = ::bind(socket->GetNativeSocket(), bind_addr, bind_addr.GetLength()); 119 120 struct sockaddr_in source_info; 121 socklen_t address_len = sizeof (struct sockaddr_in); 122 err = ::getsockname(socket->GetNativeSocket(), 123 (struct sockaddr *)&source_info, &address_len); 124 125 return std::move(socket); 126 } 127 128 std::string UDPSocket::GetRemoteConnectionURI() const { 129 if (m_socket != kInvalidSocketValue) { 130 return std::string(llvm::formatv( 131 "udp://[{0}]:{1}", m_sockaddr.GetIPAddress(), m_sockaddr.GetPort())); 132 } 133 return ""; 134 } 135