ssl_ncp.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) 2002-2025 OpenVPN Inc <sales@openvpn.net>
 *  Copyright (C) 2010-2021 Fox Crypto B.V. <openvpn@foxcrypto.com>
 *
 *  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, see <https://www.gnu.org/licenses/>.
 */
 
#ifndef OPENVPN_SSL_NCP_H
#define OPENVPN_SSL_NCP_H
 
#include "buffer.h"
#include "options.h"
#include "ssl_common.h"
 
bool tls_peer_supports_ncp(const char *peer_info);
 
/* forward declaration to break include dependency loop */
struct context;
 
bool check_pull_client_ncp(struct context *c, unsigned int found);
 
char *ncp_get_best_cipher(const char *server_list, const char *peer_info, const char *remote_cipher,
                          struct gc_arena *gc);
 
 
const char *tls_peer_ncp_list(const char *peer_info, struct gc_arena *gc);
 
char *mutate_ncp_cipher_list(const char *list, struct gc_arena *gc);
 
void append_cipher_to_ncp_list(struct options *o, const char *ciphername);
 
bool tls_item_in_cipher_list(const char *item, const char *list);
 
#define MAX_NCP_CIPHERS_LENGTH 127
 
void p2p_mode_ncp(struct tls_multi *multi, struct tls_session *session);
 
const char *get_p2p_ncp_cipher(struct tls_session *session, const char *peer_info,
                               struct gc_arena *gc);
 
 
bool check_session_cipher(struct tls_session *session, struct options *options);
 
void options_postprocess_setdefault_ncpciphers(struct options *o);
 
const char *ncp_expanded_ciphers(struct options *o, struct gc_arena *gc);
#endif /* ifndef OPENVPN_SSL_NCP_H */