path: root/src/net/eathena/network.cpp

/*
 *  The ManaPlus Client
 *  Copyright (C) 2004-2009  The Mana World Development Team
 *  Copyright (C) 2009-2010  The Mana Developers
 *  Copyright (C) 2011-2014  The ManaPlus Developers
 *
 *  This file is part of The ManaPlus Client.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  any later version.
 *
 *  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 <http://www.gnu.org/licenses/>.
 */

#include "net/eathena/network.h"

#include "logger.h"

#include "net/eathena/messagehandler.h"
#include "net/eathena/messagein.h"
#include "net/eathena/protocol.h"

#include "utils/delete2.h"

#include "debug.h"

namespace EAthena
{

/** Warning: buffers and other variables are shared,
    so there can be only one connection active at a time */

int16_t packet_lengths[] =
{
 10,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x0040
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,  50,   3,  -1,  55,  17,   3,  37,  46,  -1,  23,  -1,   3, 108,   3,   2,
  3,  28,  19,  11,   3,  -1,   9,   5,  55,  53,  58,  60,  44,   2,   6,   6,
// #0x0080
  7,   3,   2,   2,   2,   5,  16,  12,  10,   7,  29,  23,  -1,  -1,  -1,   0,
  7,  22,  28,   2,   6,  30,  -1,  -1,   3,  -1,  -1,   5,   9,  17,  17,   6,
 23,   6,   6,  -1,  -1,  -1,  -1,   8,   7,   6,   7,   4,   7,   0,  -1,   6,
  8,   8,   3,   3,  -1,   6,   6,  -1,   7,   6,   2,   5,   6,  44,   5,   3,
// #0x00C0
  7,   2,   6,   8,   6,   7,  -1,  -1,  -1,  -1,   3,   3,   6,   6,   2,  27,
  3,   4,   4,   2,  -1,  -1,   3,  -1,   6,  14,   3,  -1,  28,  29,  -1,  -1,
 30,  30,  26,   2,   6,  26,   3,   3,   8,  19,   5,   2,   3,   2,   2,   2,
  3,   2,   6,   8,  21,   8,   8,   2,   2,  26,   3,  -1,   6,  27,  30,  10,
// #0x0100
  2,   6,   6,  30,  79,  31,  10,  10,  -1,  -1,   4,   6,   6,   2,  11,  -1,
 10,  39,   4,  10,  31,  35,  10,  18,   2,  13,  15,  20,  68,   2,   3,  16,
  6,  14,  -1,  -1,  21,   8,   8,   8,   8,   8,   2,   2,   3,   4,   2,  -1,
  6,  86,   6,  -1,  -1,   7,  -1,   6,   3,  16,   4,   4,   4,   6,  24,  26,
// #0x0140
 22,  14,   6,  10,  23,  19,   6,  39,   8,   9,   6,  27,  -1,   2,   6,   6,
110,   6,  -1,  -1,  -1,  -1,  -1,   6,  -1,  54,  66,  54,  90,  42,   6,  42,
 -1,  -1,  -1,  -1,  -1,  30,  -1,   3,  14,   3,  30,  10,  43,  14, 186, 182,
 14,  30,  10,   3,  -1,   6, 106,  -1,   4,   5,   4,  -1,   6,   7,  -1,  -1,
// #0x0180
  6,   3,  106,  10,  10, 34,   0,   6,   8,   4,   4,   4,  29,  -1,  10,   6,
 90,  86,  24,   6,  30, 102,   9,   4,   8,   4,  14,  10,   4,   6,   2,   6,
  3,   3,  35,   5,  11,  26,  -1,   4,   4,   6,  10,  12,   6,  -1,   4,   4,
 11,   7,  -1,  67,  12,  18, 114,   6,   3,   6,  26,  26,  26,  26,   2,   3,
// #0x01C0
  2,  14,  10,  -1,  22,  22,   4,   2,  13,  97,   0,   9,   9,  29,   6,  28,
  8,  14,  10,  35,   6,   8,   4,  11,  54,  53,  60,   2,  -1,  47,  33,   6,
 30,   8,  34,  14,   2,   6,  26,   2,  28,  81,   6,  10,  26,   2,  -1,  -1,
 -1,  -1,  20,  10,  32,   9,  34,  14,   2,   6,  48,  56,  -1,   4,   5,  10,
// #0x0200
 26,   0,   0,   0,  18,   0,   0,   0,   0,   0,   0,  19,  10,   0,   0,   0,
  2,  -1,  16,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
 -1, 122,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x0240
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x0280
  0,   0,   0,   6,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0, 191,   0,   0,   0,   0,   0,   0,
// #0x02C0
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   3,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x0300
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x0340
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x0380
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x03C0
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x0400
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x0440
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x0480
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x04C0
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x0500
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x0540
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x0580
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x05C0
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x0600
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x0640
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x0680
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x06C0
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x0700
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x0740
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x0780
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x07C0
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
// #0x0800
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,  26,   0,
// #0x0840
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
};

static const unsigned int packet_lengths_size
    = static_cast<unsigned int>(sizeof(packet_lengths) / sizeof(int16_t));
static const unsigned int messagesSize = 0xFFFFU;
Network *Network::mInstance = nullptr;

Network::Network() :
    Ea::Network(),
    mMessageHandlers(new MessageHandler*[messagesSize])
{
    mInstance = this;
    memset(&mMessageHandlers[0], 0, sizeof(MessageHandler*) * 0xffff);
}

Network::~Network()
{
    clearHandlers();
    delete2(mMessageHandlers);
    mInstance = nullptr;
}

void Network::registerHandler(MessageHandler *const handler)
{
    if (!handler)
        return;

    for (const uint16_t *i = handler->handledMessages; *i; ++i)
        mMessageHandlers[*i] = handler;

    handler->setNetwork(this);
}

void Network::unregisterHandler(MessageHandler *const handler)
{
    if (!handler)
        return;

    for (const uint16_t *i = handler->handledMessages; *i; ++i)
        mMessageHandlers[*i] = nullptr;

    handler->setNetwork(nullptr);
}

void Network::clearHandlers()
{
    for (size_t f = 0; f < messagesSize; f ++)
    {
        if (mMessageHandlers[f])
        {
            mMessageHandlers[f]->setNetwork(nullptr);
            mMessageHandlers[f] = nullptr;
        }
    }
}

void Network::dispatchMessages()
{
    while (messageReady())
    {
        SDL_mutexP(mMutexIn);
        const unsigned int msgId = readWord(0);
        int len = -1;
        if (msgId == SMSG_SERVER_VERSION_RESPONSE)
        {
            len = 10;
        }
        else if (msgId == SMSG_UPDATE_HOST2)
        {
            len = -1;
        }
        else
        {
            if (msgId < packet_lengths_size)
                len = packet_lengths[msgId];
        }

        if (len == -1)
            len = readWord(2);

        MessageIn msg(mInBuffer, len);
        msg.postInit();
        SDL_mutexV(mMutexIn);

        if (len == 0)
        {
            // need copy data for safty
            std::string str = strprintf("Wrong packet %u ""received. Exiting.",
                msgId);
            logger->safeError(str);
        }

        if (msgId < messagesSize)
        {
            MessageHandler *const handler = mMessageHandlers[msgId];
            if (handler)
                handler->handleMessage(msg);
            else
                logger->log("Unhandled packet: %x", msgId);
        }

        skip(len);
    }
}

bool Network::messageReady()
{
    int len = -1;

    SDL_mutexP(mMutexIn);
    if (mInSize >= 2)
    {
        const int msgId = readWord(0);
        if (msgId == SMSG_SERVER_VERSION_RESPONSE)
            len = 10;
        else if (msgId == SMSG_UPDATE_HOST2)
            len = -1;
        else
            len = packet_lengths[msgId];

        if (len == -1 && mInSize > 4)
            len = readWord(2);
    }

    const bool ret = (mInSize >= static_cast<unsigned int>(len));
    SDL_mutexV(mMutexIn);

    return ret;
}

Network *Network::instance()
{
    return mInstance;
}

}  // namespace EAthena