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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibCore/LocalServer.h>
#include <LibCore/LocalSocket.h>
#include <LibCore/Notifier.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <unistd.h>
#ifndef SOCK_NONBLOCK
# include <sys/ioctl.h>
#endif
namespace Core {
LocalServer::LocalServer(Object* parent)
: Object(parent)
{
}
LocalServer::~LocalServer()
{
if (m_fd >= 0)
::close(m_fd);
}
bool LocalServer::take_over_from_system_server(String const& socket_path)
{
if (m_listening)
return false;
if (!LocalSocket::s_overtaken_sockets_parsed)
LocalSocket::parse_sockets_from_system_server();
int fd = -1;
if (socket_path.is_null()) {
// We want the first (and only) socket.
if (LocalSocket::s_overtaken_sockets.size() == 1) {
fd = LocalSocket::s_overtaken_sockets.begin()->value;
}
} else {
auto it = LocalSocket::s_overtaken_sockets.find(socket_path);
if (it != LocalSocket::s_overtaken_sockets.end()) {
fd = it->value;
}
}
if (fd >= 0) {
// Sanity check: it has to be a socket.
struct stat stat;
int rc = fstat(fd, &stat);
if (rc == 0 && S_ISSOCK(stat.st_mode)) {
// The SystemServer has passed us the socket, so use that instead of
// creating our own.
m_fd = fd;
// It had to be !CLOEXEC for obvious reasons, but we
// don't need it to be !CLOEXEC anymore, so set the
// CLOEXEC flag now.
fcntl(m_fd, F_SETFD, FD_CLOEXEC);
m_listening = true;
setup_notifier();
return true;
} else {
if (rc != 0)
perror("fstat");
dbgln("It's not a socket, what the heck??");
}
}
dbgln("Failed to take the socket over from SystemServer");
return false;
}
void LocalServer::setup_notifier()
{
m_notifier = Notifier::construct(m_fd, Notifier::Event::Read, this);
m_notifier->on_ready_to_read = [this] {
if (on_ready_to_accept)
on_ready_to_accept();
};
}
bool LocalServer::listen(const String& address)
{
if (m_listening)
return false;
int rc;
#ifdef SOCK_NONBLOCK
m_fd = socket(AF_LOCAL, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0);
#else
m_fd = socket(AF_LOCAL, SOCK_STREAM, 0);
int option = 1;
ioctl(m_fd, FIONBIO, &option);
fcntl(m_fd, F_SETFD, FD_CLOEXEC);
#endif
VERIFY(m_fd >= 0);
#ifndef __APPLE__
rc = fchmod(m_fd, 0600);
if (rc < 0) {
perror("fchmod");
VERIFY_NOT_REACHED();
}
#endif
auto socket_address = SocketAddress::local(address);
auto un_optional = socket_address.to_sockaddr_un();
if (!un_optional.has_value()) {
perror("bind");
return false;
}
auto un = un_optional.value();
rc = ::bind(m_fd, (const sockaddr*)&un, sizeof(un));
if (rc < 0) {
perror("bind");
return false;
}
rc = ::listen(m_fd, 5);
if (rc < 0) {
perror("listen");
return false;
}
m_listening = true;
setup_notifier();
return true;
}
RefPtr<LocalSocket> LocalServer::accept()
{
VERIFY(m_listening);
sockaddr_un un;
socklen_t un_size = sizeof(un);
#ifndef AK_OS_MACOS
int accepted_fd = ::accept4(m_fd, (sockaddr*)&un, &un_size, SOCK_NONBLOCK | SOCK_CLOEXEC);
#else
int accepted_fd = ::accept(m_fd, (sockaddr*)&un, &un_size);
#endif
if (accepted_fd < 0) {
perror("accept");
return nullptr;
}
#ifdef AK_OS_MACOS
int option = 1;
ioctl(m_fd, FIONBIO, &option);
(void)fcntl(accepted_fd, F_SETFD, FD_CLOEXEC);
#endif
return LocalSocket::construct(accepted_fd);
}
}
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