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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <LibCore/CLocalServer.h>
#include <LibCore/CLocalSocket.h>
#include <LibCore/CNotifier.h>
#include <stdio.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <unistd.h>
#ifndef SOCK_NONBLOCK
#include <sys/ioctl.h>
#endif
CLocalServer::CLocalServer(CObject* parent)
: CObject(parent)
{
}
CLocalServer::~CLocalServer()
{
}
bool CLocalServer::take_over_from_system_server()
{
if (m_listening)
return false;
constexpr auto socket_takeover = "SOCKET_TAKEOVER";
if (getenv(socket_takeover)) {
dbg() << "Taking the socket over from SystemServer";
// Sanity check: it has to be a socket.
struct stat stat;
int rc = fstat(3, &stat);
if (rc == 0 && S_ISSOCK(stat.st_mode)) {
// The SystemServer has passed us the socket as fd 3,
// so use that instead of creating our own.
m_fd = 3;
// 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);
// We wouldn't want our children to think we're passing
// them a socket either, so unset the env variable.
unsetenv(socket_takeover);
m_listening = true;
setup_notifier();
return true;
} else {
if (rc != 0)
perror("fstat");
dbg() << "It's not a socket, what the heck??";
}
}
dbg() << "Failed to take the socket over from SystemServer";
return false;
}
void CLocalServer::setup_notifier()
{
m_notifier = CNotifier::construct(m_fd, CNotifier::Event::Read, this);
m_notifier->on_ready_to_read = [this] {
if (on_ready_to_accept)
on_ready_to_accept();
};
}
bool CLocalServer::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
ASSERT(m_fd >= 0);
rc = fchmod(m_fd, 0600);
if (rc < 0) {
perror("fchmod");
ASSERT_NOT_REACHED();
}
auto socket_address = CSocketAddress::local(address);
auto un = socket_address.to_sockaddr_un();
rc = ::bind(m_fd, (const sockaddr*)&un, sizeof(un));
if (rc < 0) {
perror("bind");
ASSERT_NOT_REACHED();
}
rc = ::listen(m_fd, 5);
if (rc < 0) {
perror("listen");
ASSERT_NOT_REACHED();
}
m_listening = true;
setup_notifier();
return true;
}
RefPtr<CLocalSocket> CLocalServer::accept()
{
ASSERT(m_listening);
sockaddr_un un;
socklen_t un_size = sizeof(un);
int accepted_fd = ::accept(m_fd, (sockaddr*)&un, &un_size);
if (accepted_fd < 0) {
perror("accept");
return nullptr;
}
return CLocalSocket::construct(accepted_fd);
}
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