socks.h

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/*
 *  OpenVPN -- An application to securely tunnel IP networks
 *             over a single TCP/UDP port, with support for SSL/TLS-based
 *             session authentication and key exchange,
 *             packet encryption, packet authentication, and
 *             packet compression.
 *
 *  Copyright (C) 2002-2021 OpenVPN Inc <sales@openvpn.net>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

/*
 * 2004-01-30: Added Socks5 proxy support
 *   (Christof Meerwald, http://cmeerw.org)
 */

#ifndef SOCKS_H
#define SOCKS_H

#include "buffer.h"

struct openvpn_sockaddr;
struct link_socket_actual;

struct socks_proxy_info {
    bool defined;

    char server[128];
    const char *port;
    char authfile[256];
};

void socks_adjust_frame_parameters(struct frame *frame, int proto);

struct socks_proxy_info *socks_proxy_new(const char *server,
                                         const char *port,
                                         const char *authfile);

void socks_proxy_close(struct socks_proxy_info *sp);

void establish_socks_proxy_passthru(struct socks_proxy_info *p,
                                    socket_descriptor_t sd,  /* already open to proxy */
                                    const char *host,        /* openvpn server remote */
                                    const char *servname,          /* openvpn server port */
                                    volatile int *signal_received);

void establish_socks_proxy_udpassoc(struct socks_proxy_info *p,
                                    socket_descriptor_t ctrl_sd,  /* already open to proxy */
                                    socket_descriptor_t udp_sd,
                                    struct openvpn_sockaddr *relay_addr,
                                    volatile int *signal_received);

void socks_process_incoming_udp(struct buffer *buf,
                                struct link_socket_actual *from);

int socks_process_outgoing_udp(struct buffer *buf,
                               const struct link_socket_actual *to);

#endif /* ifndef SOCKS_H */