File: | src/gnu/usr.bin/clang/liblldbHostCommon/../../../llvm/lldb/source/Host/common/UDPSocket.cpp |
Warning: | line 126, 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()); |
Value stored to 'err' is never read | |
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 | } |