| File: | src/gnu/usr.bin/clang/liblldbHostCommon/../../../llvm/lldb/source/Host/common/UDPSocket.cpp |
| Warning: | line 130, column 3 Value stored to 'err' is never read |
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| 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_POSIX1 |
| 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_INET2; |
| 27 | const int kType = SOCK_DGRAM2; |
| 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(1u << 13))); |
| 61 | LLDB_LOG(log, "host/port = {0}", name)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Format("/usr/src/gnu/usr.bin/clang/liblldbHostCommon/../../../llvm/lldb/source/Host/common/UDPSocket.cpp" , __func__, "host/port = {0}", name); } while (0); |
| 62 | |
| 63 | Status error; |
| 64 | std::string host_str; |
| 65 | std::string port_str; |
| 66 | int32_t port = INT32_MIN(-0x7fffffff - 1); |
| 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(), |
Value stored to 'err' is never read | |
| 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 | } |