File: | tools/lldb/source/Host/common/UDPSocket.cpp |
Warning: | line 132, column 3 Value stored to 'err' is never read |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
1 | //===-- UDPSocket.cpp -------------------------------------------*- C++ -*-===// |
2 | // |
3 | // The LLVM Compiler Infrastructure |
4 | // |
5 | // This file is distributed under the University of Illinois Open Source |
6 | // License. See LICENSE.TXT for details. |
7 | // |
8 | //===----------------------------------------------------------------------===// |
9 | |
10 | #include "lldb/Host/common/UDPSocket.h" |
11 | |
12 | #include "lldb/Host/Config.h" |
13 | #include "lldb/Utility/Log.h" |
14 | |
15 | #ifndef LLDB_DISABLE_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 | namespace { |
26 | |
27 | const int kDomain = AF_INET2; |
28 | const int kType = SOCK_DGRAMSOCK_DGRAM; |
29 | |
30 | static const char *g_not_supported_error = "Not supported"; |
31 | } |
32 | |
33 | UDPSocket::UDPSocket(NativeSocket socket) : Socket(ProtocolUdp, true, true) { |
34 | m_socket = socket; |
35 | } |
36 | |
37 | UDPSocket::UDPSocket(bool should_close, bool child_processes_inherit) |
38 | : Socket(ProtocolUdp, should_close, child_processes_inherit) {} |
39 | |
40 | size_t UDPSocket::Send(const void *buf, const size_t num_bytes) { |
41 | return ::sendto(m_socket, static_cast<const char *>(buf), num_bytes, 0, |
42 | m_sockaddr, m_sockaddr.GetLength()); |
43 | } |
44 | |
45 | Status UDPSocket::Connect(llvm::StringRef name) { |
46 | return Status("%s", g_not_supported_error); |
47 | } |
48 | |
49 | Status UDPSocket::Listen(llvm::StringRef name, int backlog) { |
50 | return Status("%s", g_not_supported_error); |
51 | } |
52 | |
53 | Status UDPSocket::Accept(Socket *&socket) { |
54 | return Status("%s", g_not_supported_error); |
55 | } |
56 | |
57 | Status UDPSocket::Connect(llvm::StringRef name, bool child_processes_inherit, |
58 | Socket *&socket) { |
59 | std::unique_ptr<UDPSocket> final_socket; |
60 | |
61 | Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_CONNECTION(1u << 13))); |
62 | if (log) |
63 | log->Printf("UDPSocket::%s (host/port = %s)", __FUNCTION__, name.data()); |
64 | |
65 | Status error; |
66 | std::string host_str; |
67 | std::string port_str; |
68 | int32_t port = INT32_MIN(-2147483647-1); |
69 | if (!DecodeHostAndPort(name, host_str, port_str, port, &error)) |
70 | return error; |
71 | |
72 | // At this point we have setup the receive port, now we need to setup the UDP |
73 | // send socket |
74 | |
75 | struct addrinfo hints; |
76 | struct addrinfo *service_info_list = nullptr; |
77 | |
78 | ::memset(&hints, 0, sizeof(hints)); |
79 | hints.ai_family = kDomain; |
80 | hints.ai_socktype = kType; |
81 | int err = ::getaddrinfo(host_str.c_str(), port_str.c_str(), &hints, |
82 | &service_info_list); |
83 | if (err != 0) { |
84 | error.SetErrorStringWithFormat( |
85 | #if defined(_MSC_VER) && defined(UNICODE) |
86 | "getaddrinfo(%s, %s, &hints, &info) returned error %i (%S)", |
87 | #else |
88 | "getaddrinfo(%s, %s, &hints, &info) returned error %i (%s)", |
89 | #endif |
90 | host_str.c_str(), port_str.c_str(), err, gai_strerror(err)); |
91 | return error; |
92 | } |
93 | |
94 | for (struct addrinfo *service_info_ptr = service_info_list; |
95 | service_info_ptr != nullptr; |
96 | service_info_ptr = service_info_ptr->ai_next) { |
97 | auto send_fd = CreateSocket( |
98 | service_info_ptr->ai_family, service_info_ptr->ai_socktype, |
99 | service_info_ptr->ai_protocol, child_processes_inherit, error); |
100 | if (error.Success()) { |
101 | final_socket.reset(new UDPSocket(send_fd)); |
102 | final_socket->m_sockaddr = service_info_ptr; |
103 | break; |
104 | } else |
105 | continue; |
106 | } |
107 | |
108 | ::freeaddrinfo(service_info_list); |
109 | |
110 | if (!final_socket) |
111 | return error; |
112 | |
113 | SocketAddress bind_addr; |
114 | |
115 | // Only bind to the loopback address if we are expecting a connection from |
116 | // localhost to avoid any firewall issues. |
117 | const bool bind_addr_success = (host_str == "127.0.0.1" || host_str == "localhost") |
118 | ? bind_addr.SetToLocalhost(kDomain, port) |
119 | : bind_addr.SetToAnyAddress(kDomain, port); |
120 | |
121 | if (!bind_addr_success) { |
122 | error.SetErrorString("Failed to get hostspec to bind for"); |
123 | return error; |
124 | } |
125 | |
126 | bind_addr.SetPort(0); // Let the source port # be determined dynamically |
127 | |
128 | err = ::bind(final_socket->GetNativeSocket(), bind_addr, bind_addr.GetLength()); |
129 | |
130 | struct sockaddr_in source_info; |
131 | socklen_t address_len = sizeof (struct sockaddr_in); |
132 | err = ::getsockname(final_socket->GetNativeSocket(), (struct sockaddr *) &source_info, &address_len); |
Value stored to 'err' is never read | |
133 | |
134 | socket = final_socket.release(); |
135 | error.Clear(); |
136 | return error; |
137 | } |