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UDPSocket.cpp
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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 
10 
11 #include "lldb/Host/Config.h"
12 #include "lldb/Utility/Log.h"
13 
14 #if LLDB_ENABLE_POSIX
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_INET;
27 const int kType = SOCK_DGRAM;
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,
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 
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 
61  LLDB_LOG(log, "host/port = {0}", name);
62 
63  Status error;
64  std::string host_str;
65  std::string port_str;
66  int32_t port = INT32_MIN;
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(),
131  (struct sockaddr *)&source_info, &address_len);
132 
133  return std::move(socket);
134 }
135 
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 }
lldb_private::Socket::kInvalidSocketValue
static const NativeSocket kInvalidSocketValue
Definition: Socket.h:51
lldb_private::SocketAddress::GetIPAddress
std::string GetIPAddress() const
Definition: SocketAddress.cpp:136
lldb_private::SocketAddress::GetPort
uint16_t GetPort() const
Definition: SocketAddress.cpp:153
lldb_private::Socket
Definition: Socket.h:42
lldb_private::UDPSocket::Send
size_t Send(const void *buf, const size_t num_bytes) override
Definition: UDPSocket.cpp:39
lldb_private::SocketAddress::SetToAnyAddress
bool SetToAnyAddress(sa_family_t family, uint16_t port)
Definition: SocketAddress.cpp:269
lldb_private::UDPSocket::Accept
Status Accept(Socket *&socket) override
Definition: UDPSocket.cpp:52
lldb_private::SocketAddress::SetPort
bool SetPort(uint16_t port)
Definition: SocketAddress.cpp:163
endif
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Definition: API/CMakeLists.txt:15
error
static llvm::raw_ostream & error(Stream &strm)
Definition: CommandReturnObject.cpp:17
Log.h
lldb_private::Socket::m_socket
NativeSocket m_socket
Definition: Socket.h:128
string
string(SUBSTRING ${p} 10 -1 pStripped) if($
Definition: Plugins/CMakeLists.txt:38
lldb_private::SocketAddress::GetLength
socklen_t GetLength() const
Definition: SocketAddress.cpp:115
lldb_private::NativeSocket
int NativeSocket
Definition: Socket.h:37
lldb_private::UDPSocket::Listen
Status Listen(llvm::StringRef name, int backlog) override
Definition: UDPSocket.cpp:48
lldb_private::Socket::DecodeHostAndPort
static bool DecodeHostAndPort(llvm::StringRef host_and_port, std::string &host_str, std::string &port_str, int32_t &port, Status *error_ptr)
Definition: Socket.cpp:275
lldb_private::Status
Definition: Status.h:44
lldb_private::UDPSocket::UDPSocket
UDPSocket(bool should_close, bool child_processes_inherit)
Definition: UDPSocket.cpp:36
lldb_private::Socket::CreateSocket
static NativeSocket CreateSocket(const int domain, const int type, const int protocol, bool child_processes_inherit, Status &error)
lldb_private::SocketAddress::SetToLocalhost
bool SetToLocalhost(sa_family_t family, uint16_t port)
Definition: SocketAddress.cpp:247
LIBLLDB_LOG_CONNECTION
#define LIBLLDB_LOG_CONNECTION
Definition: Logging.h:27
LLDB_LOG
#define LLDB_LOG(log,...)
The LLDB_LOG* macros defined below are the way to emit log messages.
Definition: Log.h:242
lldb_private::UDPSocket::Connect
static llvm::Expected< std::unique_ptr< UDPSocket > > Connect(llvm::StringRef name, bool child_processes_inherit)
Definition: UDPSocket.cpp:57
lldb_private
A class that represents a running process on the host machine.
Definition: SBCommandInterpreterRunOptions.h:16
lldb_private::UDPSocket::m_sockaddr
SocketAddress m_sockaddr
Definition: UDPSocket.h:32
lldb_private::Log
Definition: Log.h:49
lldb_private::GetLogIfAnyCategoriesSet
Log * GetLogIfAnyCategoriesSet(uint32_t mask)
Definition: Logging.cpp:62
lldb_private::UDPSocket::GetRemoteConnectionURI
std::string GetRemoteConnectionURI() const override
Definition: UDPSocket.cpp:136
UDPSocket.h
lldb_private::SocketAddress
Definition: SocketAddress.h:34
lldb
Definition: SBAddress.h:15