/*
 * Copyright (C) Ambroz Bizjak <ambrop7@gmail.com>
 * Contributions:
 * Transparent DNS: Copyright (C) Kerem Hadimli <kerem.hadimli@gmail.com>
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the author nor the
 *    names of its contributors may be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef BADVPN_UDPGW_CLIENT_UDPGWCLIENT_H
#define BADVPN_UDPGW_CLIENT_UDPGWCLIENT_H

#include <stdint.h>

#include <protocol/udpgw_proto.h>
#include <misc/debug.h>
#include <misc/packed.h>
#include <structure/BAVL.h>
#include <structure/LinkedList1.h>
#include <base/DebugObject.h>
#include <system/BAddr.h>
#include <base/BPending.h>
#include <flow/PacketPassFairQueue.h>
#include <flow/PacketStreamSender.h>
#include <flow/PacketProtoFlow.h>
#include <flow/PacketProtoDecoder.h>
#include <flow/PacketPassConnector.h>
#include <flowextra/PacketPassInactivityMonitor.h>

typedef void (*UdpGwClient_handler_servererror) (void *user);
typedef void (*UdpGwClient_handler_received) (void *user, BAddr local_addr, BAddr remote_addr, const uint8_t *data, int data_len);

B_START_PACKED
struct UdpGwClient__keepalive_packet {
    struct packetproto_header pp;
    struct udpgw_header udpgw;
} B_PACKED;
B_END_PACKED

typedef struct {
    int udp_mtu;
    int max_connections;
    int send_buffer_size;
    btime_t keepalive_time;
    BReactor *reactor;
    void *user;
    UdpGwClient_handler_servererror handler_servererror;
    UdpGwClient_handler_received handler_received;
    int udpgw_mtu;
    int pp_mtu;
    BAVL connections_tree_by_conaddr;
    BAVL connections_tree_by_conid;
    LinkedList1 connections_list;
    int num_connections;
    int next_conid;
    PacketPassFairQueue send_queue;
    PacketPassInactivityMonitor send_monitor;
    PacketPassConnector send_connector;
    struct UdpGwClient__keepalive_packet keepalive_packet;
    PacketPassInterface *keepalive_if;
    PacketPassFairQueueFlow keepalive_qflow;
    int keepalive_sending;
    int have_server;
    PacketStreamSender send_sender;
    PacketProtoDecoder recv_decoder;
    PacketPassInterface recv_if;
    DebugObject d_obj;
} UdpGwClient;

struct UdpGwClient_conaddr {
    BAddr local_addr;
    BAddr remote_addr;
};

struct UdpGwClient_connection {
    UdpGwClient *client;
    struct UdpGwClient_conaddr conaddr;
    uint8_t first_flags;
    const uint8_t *first_data;
    int first_data_len;
    uint16_t conid;
    BPending first_job;
    BufferWriter *send_if;
    PacketProtoFlow send_ppflow;
    PacketPassFairQueueFlow send_qflow;
    BAVLNode connections_tree_by_conaddr_node;
    BAVLNode connections_tree_by_conid_node;
    LinkedList1Node connections_list_node;
};

int UdpGwClient_Init (UdpGwClient *o, int udp_mtu, int max_connections, int send_buffer_size, btime_t keepalive_time, BReactor *reactor, void *user,
                      UdpGwClient_handler_servererror handler_servererror,
                      UdpGwClient_handler_received handler_received) WARN_UNUSED;
void UdpGwClient_Free (UdpGwClient *o);
void UdpGwClient_SubmitPacket (UdpGwClient *o, BAddr local_addr, BAddr remote_addr, int is_dns, const uint8_t *data, int data_len);
int UdpGwClient_ConnectServer (UdpGwClient *o, StreamPassInterface *send_if, StreamRecvInterface *recv_if) WARN_UNUSED;
void UdpGwClient_DisconnectServer (UdpGwClient *o);

#endif