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/Log.h" 13 14 #if LLDB_ENABLE_POSIX 15 #include <arpa/inet.h> 16 #include <sys/socket.h> 17 #endif 18 19 #include <memory> 20 21 using namespace lldb; 22 using namespace lldb_private; 23 24 namespace { 25 26 const int kDomain = AF_INET; 27 const int kType = SOCK_DGRAM; 28 29 static const char *g_not_supported_error = "Not supported"; 30 } 31 32 UDPSocket::UDPSocket(NativeSocket socket) : Socket(ProtocolUdp, true, true) { 33 m_socket = socket; 34 } 35 36 UDPSocket::UDPSocket(bool should_close, bool child_processes_inherit) 37 : Socket(ProtocolUdp, should_close, child_processes_inherit) {} 38 39 size_t UDPSocket::Send(const void *buf, const size_t num_bytes) { 40 return ::sendto(m_socket, static_cast<const char *>(buf), num_bytes, 0, 41 m_sockaddr, m_sockaddr.GetLength()); 42 } 43 44 Status UDPSocket::Connect(llvm::StringRef name) { 45 return Status("%s", g_not_supported_error); 46 } 47 48 Status UDPSocket::Listen(llvm::StringRef name, int backlog) { 49 return Status("%s", g_not_supported_error); 50 } 51 52 Status UDPSocket::Accept(Socket *&socket) { 53 return Status("%s", g_not_supported_error); 54 } 55 56 llvm::Expected<std::unique_ptr<UDPSocket>> 57 UDPSocket::Connect(llvm::StringRef name, bool child_processes_inherit) { 58 std::unique_ptr<UDPSocket> socket; 59 60 Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_CONNECTION)); 61 LLDB_LOG(log, "host/port = {0}", name); 62 63 Status error; 64 std::string host_str; 65 std::string port_str; 66 int32_t port = INT32_MIN; 67 if (!DecodeHostAndPort(name, host_str, port_str, port, &error)) 68 return error.ToError(); 69 70 // At this point we have setup the receive port, now we need to setup the UDP 71 // send socket 72 73 struct addrinfo hints; 74 struct addrinfo *service_info_list = nullptr; 75 76 ::memset(&hints, 0, sizeof(hints)); 77 hints.ai_family = kDomain; 78 hints.ai_socktype = kType; 79 int err = ::getaddrinfo(host_str.c_str(), port_str.c_str(), &hints, 80 &service_info_list); 81 if (err != 0) { 82 error.SetErrorStringWithFormat( 83 #if defined(_WIN32) && defined(UNICODE) 84 "getaddrinfo(%s, %s, &hints, &info) returned error %i (%S)", 85 #else 86 "getaddrinfo(%s, %s, &hints, &info) returned error %i (%s)", 87 #endif 88 host_str.c_str(), port_str.c_str(), err, gai_strerror(err)); 89 return error.ToError(); 90 } 91 92 for (struct addrinfo *service_info_ptr = service_info_list; 93 service_info_ptr != nullptr; 94 service_info_ptr = service_info_ptr->ai_next) { 95 auto send_fd = CreateSocket( 96 service_info_ptr->ai_family, service_info_ptr->ai_socktype, 97 service_info_ptr->ai_protocol, child_processes_inherit, error); 98 if (error.Success()) { 99 socket.reset(new UDPSocket(send_fd)); 100 socket->m_sockaddr = service_info_ptr; 101 break; 102 } else 103 continue; 104 } 105 106 ::freeaddrinfo(service_info_list); 107 108 if (!socket) 109 return error.ToError(); 110 111 SocketAddress bind_addr; 112 113 // Only bind to the loopback address if we are expecting a connection from 114 // localhost to avoid any firewall issues. 115 const bool bind_addr_success = (host_str == "127.0.0.1" || host_str == "localhost") 116 ? bind_addr.SetToLocalhost(kDomain, port) 117 : bind_addr.SetToAnyAddress(kDomain, port); 118 119 if (!bind_addr_success) { 120 error.SetErrorString("Failed to get hostspec to bind for"); 121 return error.ToError(); 122 } 123 124 bind_addr.SetPort(0); // Let the source port # be determined dynamically 125 126 err = ::bind(socket->GetNativeSocket(), bind_addr, bind_addr.GetLength()); 127 128 struct sockaddr_in source_info; 129 socklen_t address_len = sizeof (struct sockaddr_in); 130 err = ::getsockname(socket->GetNativeSocket(), 131 (struct sockaddr *)&source_info, &address_len); 132 133 return std::move(socket); 134 } 135 136 std::string UDPSocket::GetRemoteConnectionURI() const { 137 if (m_socket != kInvalidSocketValue) { 138 return std::string(llvm::formatv( 139 "udp://[{0}]:{1}", m_sockaddr.GetIPAddress(), m_sockaddr.GetPort())); 140 } 141 return ""; 142 } 143