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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/LocalSocket.h>
#include <errno.h>
#include <stdio.h>
#include <sys/socket.h>
#include <sys/stat.h>
#ifndef SOCK_NONBLOCK
# include <sys/ioctl.h>
#endif
namespace Core {
LocalSocket::LocalSocket(int fd, Object* parent)
: Socket(Socket::Type::Local, parent)
{
// NOTE: This constructor is used by LocalServer::accept(), so the socket is already connected.
m_connected = true;
set_fd(fd);
set_mode(IODevice::ReadWrite);
set_error(0);
}
LocalSocket::LocalSocket(Object* parent)
: Socket(Socket::Type::Local, parent)
{
#ifdef SOCK_NONBLOCK
int fd = socket(AF_LOCAL, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0);
#else
int fd = socket(AF_LOCAL, SOCK_STREAM, 0);
int option = 1;
ioctl(fd, FIONBIO, &option);
fcntl(fd, F_SETFD, FD_CLOEXEC);
#endif
if (fd < 0) {
set_error(errno);
} else {
set_fd(fd);
set_mode(IODevice::ReadWrite);
set_error(0);
}
}
LocalSocket::~LocalSocket()
{
}
RefPtr<LocalSocket> LocalSocket::take_over_accepted_socket_from_system_server()
{
constexpr auto socket_takeover = "SOCKET_TAKEOVER";
if (!getenv(socket_takeover))
return nullptr;
// The SystemServer has passed us the socket as fd 3,
// so use that instead of creating our own.
constexpr int fd = 3;
// Sanity check: it has to be a socket.
struct stat stat;
int rc = fstat(fd, &stat);
if (rc < 0 || !S_ISSOCK(stat.st_mode)) {
if (rc != 0)
perror("fstat");
dbgln("ERROR: The fd we got from SystemServer is not a socket");
return nullptr;
}
auto socket = LocalSocket::construct(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(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);
return socket;
}
}
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