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)
31 : Socket(ProtocolUdp, /*should_close=*/true) {
32 m_socket = socket;
33}
34
35UDPSocket::UDPSocket(bool should_close) : Socket(ProtocolUdp, should_close) {}
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::FromErrorStringWithFormat(format: "%s", g_not_supported_error);
44}
45
46Status UDPSocket::Listen(llvm::StringRef name, int backlog) {
47 return Status::FromErrorStringWithFormat(format: "%s", g_not_supported_error);
48}
49
50llvm::Expected<std::unique_ptr<UDPSocket>>
51UDPSocket::CreateConnected(llvm::StringRef name) {
52 std::unique_ptr<UDPSocket> socket;
53
54 Log *log = GetLog(mask: LLDBLog::Connection);
55 LLDB_LOG(log, "host/port = {0}", name);
56
57 Status error;
58 llvm::Expected<HostAndPort> host_port = DecodeHostAndPort(host_and_port: name);
59 if (!host_port)
60 return host_port.takeError();
61
62 // At this point we have setup the receive port, now we need to setup the UDP
63 // send socket
64
65 struct addrinfo hints;
66 struct addrinfo *service_info_list = nullptr;
67
68 ::memset(s: &hints, c: 0, n: sizeof(hints));
69 hints.ai_family = kDomain;
70 hints.ai_socktype = kType;
71 int err = ::getaddrinfo(name: host_port->hostname.c_str(), service: std::to_string(val: host_port->port).c_str(), req: &hints,
72 pai: &service_info_list);
73 if (err != 0) {
74 error = Status::FromErrorStringWithFormat(
75#if defined(_WIN32) && defined(UNICODE)
76 "getaddrinfo(%s, %d, &hints, &info) returned error %i (%S)",
77#else
78 format: "getaddrinfo(%s, %d, &hints, &info) returned error %i (%s)",
79#endif
80 host_port->hostname.c_str(), host_port->port, err, gai_strerror(ecode: err));
81 return error.ToError();
82 }
83
84 for (struct addrinfo *service_info_ptr = service_info_list;
85 service_info_ptr != nullptr;
86 service_info_ptr = service_info_ptr->ai_next) {
87 auto send_fd =
88 CreateSocket(domain: service_info_ptr->ai_family, type: service_info_ptr->ai_socktype,
89 protocol: service_info_ptr->ai_protocol, error);
90 if (error.Success()) {
91 socket.reset(p: new UDPSocket(send_fd));
92 socket->m_sockaddr = service_info_ptr;
93 break;
94 } else
95 continue;
96 }
97
98 ::freeaddrinfo(ai: service_info_list);
99
100 if (!socket)
101 return error.ToError();
102
103 SocketAddress bind_addr;
104
105 // Only bind to the loopback address if we are expecting a connection from
106 // localhost to avoid any firewall issues.
107 const bool bind_addr_success = (host_port->hostname == "127.0.0.1" || host_port->hostname == "localhost")
108 ? bind_addr.SetToLocalhost(family: kDomain, port: host_port->port)
109 : bind_addr.SetToAnyAddress(family: kDomain, port: host_port->port);
110
111 if (!bind_addr_success) {
112 error = Status::FromErrorString(str: "Failed to get hostspec to bind for");
113 return error.ToError();
114 }
115
116 bind_addr.SetPort(0); // Let the source port # be determined dynamically
117
118 err = ::bind(fd: socket->GetNativeSocket(), addr: bind_addr, len: bind_addr.GetLength());
119
120 struct sockaddr_in source_info;
121 socklen_t address_len = sizeof (struct sockaddr_in);
122 err = ::getsockname(fd: socket->GetNativeSocket(),
123 addr: (struct sockaddr *)&source_info, len: &address_len);
124
125 return std::move(socket);
126}
127
128std::string UDPSocket::GetRemoteConnectionURI() const {
129 if (m_socket != kInvalidSocketValue) {
130 return std::string(llvm::formatv(
131 Fmt: "udp://[{0}]:{1}", Vals: m_sockaddr.GetIPAddress(), Vals: m_sockaddr.GetPort()));
132 }
133 return "";
134}
135

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