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//===-- Acceptor.cpp --------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "Acceptor.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/ScopedPrinter.h"
#include "lldb/Host/ConnectionFileDescriptor.h"
#include "lldb/Host/common/TCPSocket.h"
#include "lldb/Utility/StreamString.h"
#include "lldb/Utility/UriParser.h"
#include <optional>
using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::lldb_server;
using namespace llvm;
namespace {
struct SocketScheme {
const char *m_scheme;
const Socket::SocketProtocol m_protocol;
};
SocketScheme socket_schemes[] = {
{"tcp", Socket::ProtocolTcp},
{"udp", Socket::ProtocolUdp},
{"unix", Socket::ProtocolUnixDomain},
{"unix-abstract", Socket::ProtocolUnixAbstract},
};
bool FindProtocolByScheme(const char *scheme,
Socket::SocketProtocol &protocol) {
for (auto s : socket_schemes) {
if (!strcmp(s.m_scheme, scheme)) {
protocol = s.m_protocol;
return true;
}
}
return false;
}
const char *FindSchemeByProtocol(const Socket::SocketProtocol protocol) {
for (auto s : socket_schemes) {
if (s.m_protocol == protocol)
return s.m_scheme;
}
return nullptr;
}
}
Status Acceptor::Listen(int backlog) {
return m_listener_socket_up->Listen(StringRef(m_name), backlog);
}
Status Acceptor::Accept(const bool child_processes_inherit, Connection *&conn) {
Socket *conn_socket = nullptr;
auto error = m_listener_socket_up->Accept(conn_socket);
if (error.Success())
conn = new ConnectionFileDescriptor(conn_socket);
return error;
}
Socket::SocketProtocol Acceptor::GetSocketProtocol() const {
return m_listener_socket_up->GetSocketProtocol();
}
const char *Acceptor::GetSocketScheme() const {
return FindSchemeByProtocol(GetSocketProtocol());
}
std::string Acceptor::GetLocalSocketId() const { return m_local_socket_id(); }
std::unique_ptr<Acceptor> Acceptor::Create(StringRef name,
const bool child_processes_inherit,
Status &error) {
error.Clear();
Socket::SocketProtocol socket_protocol = Socket::ProtocolUnixDomain;
// Try to match socket name as URL - e.g., tcp://localhost:5555
if (std::optional<URI> res = URI::Parse(name)) {
if (!FindProtocolByScheme(res->scheme.str().c_str(), socket_protocol))
error.SetErrorStringWithFormat("Unknown protocol scheme \"%s\"",
res->scheme.str().c_str());
else
name = name.drop_front(res->scheme.size() + strlen("://"));
} else {
// Try to match socket name as $host:port - e.g., localhost:5555
if (!llvm::errorToBool(Socket::DecodeHostAndPort(name).takeError()))
socket_protocol = Socket::ProtocolTcp;
}
if (error.Fail())
return std::unique_ptr<Acceptor>();
std::unique_ptr<Socket> listener_socket_up =
Socket::Create(socket_protocol, child_processes_inherit, error);
LocalSocketIdFunc local_socket_id;
if (error.Success()) {
if (listener_socket_up->GetSocketProtocol() == Socket::ProtocolTcp) {
TCPSocket *tcp_socket =
static_cast<TCPSocket *>(listener_socket_up.get());
local_socket_id = [tcp_socket]() {
auto local_port = tcp_socket->GetLocalPortNumber();
return (local_port != 0) ? llvm::to_string(local_port) : "";
};
} else {
const std::string socket_name = std::string(name);
local_socket_id = [socket_name]() { return socket_name; };
}
return std::unique_ptr<Acceptor>(
new Acceptor(std::move(listener_socket_up), name, local_socket_id));
}
return std::unique_ptr<Acceptor>();
}
Acceptor::Acceptor(std::unique_ptr<Socket> &&listener_socket, StringRef name,
const LocalSocketIdFunc &local_socket_id)
: m_listener_socket_up(std::move(listener_socket)), m_name(name.str()),
m_local_socket_id(local_socket_id) {}
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