acc.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) 2025 OpenVPN Inc <sales@openvpn.net>
 *  Copyright (C) 2025 Arne Schwabe <arne@rfc2549.org>
 *
 *
 *  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.
 */
 
#ifndef ACC_H
#define ACC_H
 
#include "openvpn.h"
 
#define ACC_MIN_MSG_LEN 64
#define ACC_MAX_MSG_LEN 1280

void
receive_acc_message(struct context *c, const struct buffer *buffer);
 
bool
send_acc_message(struct context *c,
                 struct tls_multi *tls_multi,
                 struct tls_session *session,
                 const char *protocol, bool fragment,
                 const char *msg, bool base64);
 

char *
parse_acc_parameters(const char *capabilities,
                     const char *delim,
                     int *max_acc_len,
                     bool server,
                     struct gc_arena *gc);

void
determine_common_acc_protocols(struct tls_multi *multi, struct tls_session *session);

enum acc_message_flag
{
    ACC_MESSAGE_FLAGS_ASCII = 1,
    ACC_MESSAGE_FLAGS_BASE64 = 2,
    ACC_MESSAGE_FLAGS_FRAGMENT = 4,
};

int
parse_acc_message_flags(const char *flags, const char **err_reason, struct gc_arena *gc);

struct buffer
get_list_intersection(struct gc_arena *gc, const char *list1, const char *list2);

void
notify_client_acc_protocols(struct tls_multi *multi);
#endif