161 lines
3.9 KiB
C++
161 lines
3.9 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibCore/LocalServer.h>
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#include <LibCore/LocalSocket.h>
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#include <LibCore/Notifier.h>
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#include <LibCore/System.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#ifndef SOCK_NONBLOCK
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# include <sys/ioctl.h>
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#endif
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namespace Core {
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LocalServer::LocalServer(Object* parent)
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: Object(parent)
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{
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}
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LocalServer::~LocalServer()
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{
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if (m_fd >= 0)
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::close(m_fd);
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}
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ErrorOr<void> LocalServer::take_over_from_system_server(String const& socket_path)
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{
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if (m_listening)
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return Error::from_string_literal("Core::LocalServer: Can't perform socket takeover when already listening"sv);
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if (!LocalSocket::s_overtaken_sockets_parsed)
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LocalSocket::parse_sockets_from_system_server();
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int fd = -1;
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if (socket_path.is_null()) {
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// We want the first (and only) socket.
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if (LocalSocket::s_overtaken_sockets.size() == 1) {
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fd = LocalSocket::s_overtaken_sockets.begin()->value;
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}
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} else {
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auto it = LocalSocket::s_overtaken_sockets.find(socket_path);
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if (it != LocalSocket::s_overtaken_sockets.end()) {
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fd = it->value;
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}
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}
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if (fd < 0)
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return Error::from_string_literal("Core::LocalServer: No file descriptor for socket takeover"sv);
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// Sanity check: it has to be a socket.
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auto stat = TRY(Core::System::fstat(fd));
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if (!S_ISSOCK(stat.st_mode))
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return Error::from_string_literal("Core::LocalServer: Attempted socket takeover with non-socket file descriptor"sv);
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// It had to be !CLOEXEC for obvious reasons, but we
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// don't need it to be !CLOEXEC anymore, so set the
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// CLOEXEC flag now.
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TRY(Core::System::fcntl(fd, F_SETFD, FD_CLOEXEC));
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// The SystemServer has passed us the socket, so use that instead of
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// creating our own.
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m_fd = fd;
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m_listening = true;
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setup_notifier();
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return {};
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}
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void LocalServer::setup_notifier()
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{
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m_notifier = Notifier::construct(m_fd, Notifier::Event::Read, this);
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m_notifier->on_ready_to_read = [this] {
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if (on_accept) {
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if (auto client_socket = accept())
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on_accept(client_socket.release_nonnull());
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}
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};
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}
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bool LocalServer::listen(const String& address)
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{
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if (m_listening)
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return false;
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int rc;
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#ifdef SOCK_NONBLOCK
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m_fd = socket(AF_LOCAL, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0);
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#else
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m_fd = socket(AF_LOCAL, SOCK_STREAM, 0);
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int option = 1;
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ioctl(m_fd, FIONBIO, &option);
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fcntl(m_fd, F_SETFD, FD_CLOEXEC);
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#endif
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VERIFY(m_fd >= 0);
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#ifndef AK_OS_MACOS
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rc = fchmod(m_fd, 0600);
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if (rc < 0) {
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perror("fchmod");
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VERIFY_NOT_REACHED();
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}
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#endif
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auto socket_address = SocketAddress::local(address);
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auto un_optional = socket_address.to_sockaddr_un();
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if (!un_optional.has_value()) {
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perror("bind");
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return false;
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}
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auto un = un_optional.value();
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rc = ::bind(m_fd, (const sockaddr*)&un, sizeof(un));
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if (rc < 0) {
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perror("bind");
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return false;
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}
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rc = ::listen(m_fd, 5);
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if (rc < 0) {
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perror("listen");
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return false;
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}
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m_listening = true;
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setup_notifier();
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return true;
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}
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RefPtr<LocalSocket> LocalServer::accept()
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{
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VERIFY(m_listening);
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sockaddr_un un;
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socklen_t un_size = sizeof(un);
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#ifndef AK_OS_MACOS
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int accepted_fd = ::accept4(m_fd, (sockaddr*)&un, &un_size, SOCK_NONBLOCK | SOCK_CLOEXEC);
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#else
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int accepted_fd = ::accept(m_fd, (sockaddr*)&un, &un_size);
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#endif
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if (accepted_fd < 0) {
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perror("accept");
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return nullptr;
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}
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#ifdef AK_OS_MACOS
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int option = 1;
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ioctl(m_fd, FIONBIO, &option);
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(void)fcntl(accepted_fd, F_SETFD, FD_CLOEXEC);
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#endif
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return LocalSocket::construct(accepted_fd);
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}
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}
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