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

source code of lldb/source/Host/common/UDPSocket.cpp