/*
 *  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) 2013-2023 Heiko Hund <heiko.hund@sophos.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, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef OPENVPN_MSG_H_
#define OPENVPN_MSG_H_

typedef enum {
    msg_acknowledgement,
    msg_add_address,
    msg_del_address,
    msg_add_route,
    msg_del_route,
    msg_add_dns_cfg,
    msg_del_dns_cfg,
    msg_add_nbt_cfg,
    msg_del_nbt_cfg,
    msg_flush_neighbors,
    msg_add_block_dns,
    msg_del_block_dns,
    msg_register_dns,
    msg_enable_dhcp,
    msg_register_ring_buffers,
    msg_set_mtu
} message_type_t;

typedef struct {
    message_type_t type;
    size_t size;
    int message_id;
} message_header_t;

typedef union {
    struct in_addr ipv4;
    struct in6_addr ipv6;
} inet_address_t;

typedef struct {
    int index;
    char name[256];
} interface_t;

typedef struct {
    message_header_t header;
    short family;
    inet_address_t address;
    int prefix_len;
    interface_t iface;
} address_message_t;

typedef struct {
    message_header_t header;
    short family;
    inet_address_t prefix;
    int prefix_len;
    inet_address_t gateway;
    interface_t iface;
    int metric;
} route_message_t;

typedef struct {
    message_header_t header;
    interface_t iface;
    char domains[512];
    short family;
    int addr_len;
    inet_address_t addr[4]; /* support up to 4 dns addresses */
} dns_cfg_message_t;

typedef struct {
    message_header_t header;
    interface_t iface;
    int disable_nbt;
    int nbt_type;
    char scope_id[256];
    struct in_addr primary_nbns;
    struct in_addr secondary_nbns;
} nbt_cfg_message_t;

/* TODO: NTP */

typedef struct {
    message_header_t header;
    short family;
    interface_t iface;
} flush_neighbors_message_t;

typedef struct {
    message_header_t header;
    int error_number;
} ack_message_t;

typedef struct {
    message_header_t header;
    interface_t iface;
} block_dns_message_t;

typedef struct {
    message_header_t header;
    interface_t iface;
} enable_dhcp_message_t;

typedef struct {
    message_header_t header;
    HANDLE device;
    HANDLE send_ring_handle;
    HANDLE receive_ring_handle;
    HANDLE send_tail_moved;
    HANDLE receive_tail_moved;
} register_ring_buffers_message_t;

typedef struct {
    message_header_t header;
    interface_t iface;
    short family;
    int mtu;
} set_mtu_message_t;

#endif /* ifndef OPENVPN_MSG_H_ */
