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// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012-2022 OpenVPN Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License Version 3
// as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program in the COPYING file.
// If not, see <http://www.gnu.org/licenses/>.
#ifndef OPENVPN_COMMON_SOCKOPT_H
#define OPENVPN_COMMON_SOCKOPT_H
#include <openvpn/common/platform.hpp>
#if !defined(OPENVPN_PLATFORM_WIN)
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <openvpn/common/exception.hpp>
namespace openvpn {
namespace SockOpt {
#ifdef SO_REUSEPORT
// set SO_REUSEPORT for inter-thread load balancing
inline void reuseport(const int fd)
{
int on = 1;
if (::setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, (void *)&on, sizeof(on)) < 0)
throw Exception("error setting SO_REUSEPORT on socket");
}
#endif
// set SO_REUSEADDR for TCP
inline void reuseaddr(const int fd)
{
int on = 1;
if (::setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)) < 0)
throw Exception("error setting SO_REUSEADDR on socket");
}
// set TCP_NODELAY for TCP
inline void tcp_nodelay(const int fd)
{
int state = 1;
if (::setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (void *)&state, sizeof(state)) != 0)
throw Exception("error setting TCP_NODELAY on socket");
}
// set FD_CLOEXEC to prevent fd from being passed across execs
inline void set_cloexec(const int fd)
{
if (::fcntl(fd, F_SETFD, FD_CLOEXEC) < 0)
throw Exception("error setting FD_CLOEXEC on file-descriptor/socket");
}
// set non-block mode on socket
static inline void set_nonblock(const int fd)
{
if (::fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
throw Exception("error setting socket to non-blocking mode");
}
} // namespace SockOpt
} // namespace openvpn
#endif
#endif
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