1 //===-- Acceptor.cpp --------------------------------------------*- C++ -*-===//
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 "Acceptor.h"
10
11 #include "llvm/ADT/StringRef.h"
12 #include "llvm/Support/ScopedPrinter.h"
13
14 #include "lldb/Host/ConnectionFileDescriptor.h"
15 #include "lldb/Host/common/TCPSocket.h"
16 #include "lldb/Utility/StreamString.h"
17 #include "lldb/Utility/UriParser.h"
18 #include <optional>
19
20 using namespace lldb;
21 using namespace lldb_private;
22 using namespace lldb_private::lldb_server;
23 using namespace llvm;
24
25 namespace {
26
27 struct SocketScheme {
28 const char *m_scheme;
29 const Socket::SocketProtocol m_protocol;
30 };
31
32 SocketScheme socket_schemes[] = {
33 {"tcp", Socket::ProtocolTcp},
34 {"udp", Socket::ProtocolUdp},
35 {"unix", Socket::ProtocolUnixDomain},
36 {"unix-abstract", Socket::ProtocolUnixAbstract},
37 };
38
FindProtocolByScheme(const char * scheme,Socket::SocketProtocol & protocol)39 bool FindProtocolByScheme(const char *scheme,
40 Socket::SocketProtocol &protocol) {
41 for (auto s : socket_schemes) {
42 if (!strcmp(s.m_scheme, scheme)) {
43 protocol = s.m_protocol;
44 return true;
45 }
46 }
47 return false;
48 }
49
FindSchemeByProtocol(const Socket::SocketProtocol protocol)50 const char *FindSchemeByProtocol(const Socket::SocketProtocol protocol) {
51 for (auto s : socket_schemes) {
52 if (s.m_protocol == protocol)
53 return s.m_scheme;
54 }
55 return nullptr;
56 }
57 }
58
Listen(int backlog)59 Status Acceptor::Listen(int backlog) {
60 return m_listener_socket_up->Listen(StringRef(m_name), backlog);
61 }
62
Accept(const bool child_processes_inherit,Connection * & conn)63 Status Acceptor::Accept(const bool child_processes_inherit, Connection *&conn) {
64 Socket *conn_socket = nullptr;
65 auto error = m_listener_socket_up->Accept(conn_socket);
66 if (error.Success())
67 conn = new ConnectionFileDescriptor(conn_socket);
68
69 return error;
70 }
71
GetSocketProtocol() const72 Socket::SocketProtocol Acceptor::GetSocketProtocol() const {
73 return m_listener_socket_up->GetSocketProtocol();
74 }
75
GetSocketScheme() const76 const char *Acceptor::GetSocketScheme() const {
77 return FindSchemeByProtocol(GetSocketProtocol());
78 }
79
GetLocalSocketId() const80 std::string Acceptor::GetLocalSocketId() const { return m_local_socket_id(); }
81
Create(StringRef name,const bool child_processes_inherit,Status & error)82 std::unique_ptr<Acceptor> Acceptor::Create(StringRef name,
83 const bool child_processes_inherit,
84 Status &error) {
85 error.Clear();
86
87 Socket::SocketProtocol socket_protocol = Socket::ProtocolUnixDomain;
88 // Try to match socket name as URL - e.g., tcp://localhost:5555
89 if (std::optional<URI> res = URI::Parse(name)) {
90 if (!FindProtocolByScheme(res->scheme.str().c_str(), socket_protocol))
91 error.SetErrorStringWithFormat("Unknown protocol scheme \"%s\"",
92 res->scheme.str().c_str());
93 else
94 name = name.drop_front(res->scheme.size() + strlen("://"));
95 } else {
96 // Try to match socket name as $host:port - e.g., localhost:5555
97 if (!llvm::errorToBool(Socket::DecodeHostAndPort(name).takeError()))
98 socket_protocol = Socket::ProtocolTcp;
99 }
100
101 if (error.Fail())
102 return std::unique_ptr<Acceptor>();
103
104 std::unique_ptr<Socket> listener_socket_up =
105 Socket::Create(socket_protocol, child_processes_inherit, error);
106
107 LocalSocketIdFunc local_socket_id;
108 if (error.Success()) {
109 if (listener_socket_up->GetSocketProtocol() == Socket::ProtocolTcp) {
110 TCPSocket *tcp_socket =
111 static_cast<TCPSocket *>(listener_socket_up.get());
112 local_socket_id = [tcp_socket]() {
113 auto local_port = tcp_socket->GetLocalPortNumber();
114 return (local_port != 0) ? llvm::to_string(local_port) : "";
115 };
116 } else {
117 const std::string socket_name = std::string(name);
118 local_socket_id = [socket_name]() { return socket_name; };
119 }
120
121 return std::unique_ptr<Acceptor>(
122 new Acceptor(std::move(listener_socket_up), name, local_socket_id));
123 }
124
125 return std::unique_ptr<Acceptor>();
126 }
127
Acceptor(std::unique_ptr<Socket> && listener_socket,StringRef name,const LocalSocketIdFunc & local_socket_id)128 Acceptor::Acceptor(std::unique_ptr<Socket> &&listener_socket, StringRef name,
129 const LocalSocketIdFunc &local_socket_id)
130 : m_listener_socket_up(std::move(listener_socket)), m_name(name.str()),
131 m_local_socket_id(local_socket_id) {}
132