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+/*
+ * The Mana World
+ * Copyright 2004 The Mana World Development Team
+ *
+ * This file is part of The Mana World.
+ *
+ * The Mana World 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.
+ *
+ * The Mana World 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 The Mana World; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * $Id: network.cpp 2187 2006-02-24 20:15:19Z der_doener $
+ */
+
+#include "network.h"
+
+#include "messagehandler.h"
+#include "messagein.h"
+
+#include "../main.h"
+#include "../log.h"
+
+/** Warning: buffers and other variables are shared,
+ so there can be only one connection active at a time */
+
+short 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, 0, 0, 0, 55, 17, 3, 37, 46, -1, 23, -1, 3,108, 3, 2,
+ 3, 28, 19, 11, 3, -1, 9, 5, 54, 53, 58, 60, 41, 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,
+// #0x200
+ 26, 0, 0, 0, 18, 0, 0, 0, 0, 0, 0, 19, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+};
+
+const unsigned int BUFFER_SIZE = 65536;
+
+int networkThread(void *data)
+{
+ Network *network = static_cast<Network*>(data);
+
+ if (!network->realConnect())
+ return -1;
+
+ network->receive();
+
+ return 0;
+}
+
+Network::Network():
+ mAddress(), mPort(0),
+ mInBuffer(new char[BUFFER_SIZE]),
+ mOutBuffer(new char[BUFFER_SIZE]),
+ mInSize(0), mOutSize(0),
+ mToSkip(0),
+ mState(IDLE),
+ mWorkerThread(0)
+{
+ mMutex = SDL_CreateMutex();
+}
+
+Network::~Network()
+{
+ clearHandlers();
+
+ if (mState != IDLE && mState != ERROR_BROKE)
+ disconnect();
+
+ SDL_DestroyMutex(mMutex);
+
+ delete mInBuffer;
+ delete mOutBuffer;
+}
+
+bool Network::connect(const std::string &address, short port)
+{
+ if (mState != IDLE && mState != ERROR_BROKE)
+ {
+ //logger->log("Tried to connect an already connected socket!");
+ return false;
+ }
+
+ if (address.empty())
+ {
+ //logger->log("Empty address given to Network::connect()!");
+ mState = ERROR_BROKE;
+ return false;
+ }
+
+ //logger->log("Network::Connecting to %s:%i", address.c_str(), port);
+
+ mAddress = address;
+ mPort = port;
+
+ // Reset to sane values
+ mOutSize = 0;
+ mInSize = 0;
+ mToSkip = 0;
+
+ mState = CONNECTING;
+ mWorkerThread = SDL_CreateThread(networkThread, this);
+ if (!mWorkerThread)
+ {
+ //logger->log("Unable to create network worker thread");
+ mState = ERROR_BROKE;
+ return false;
+ }
+
+ return true;
+}
+
+void Network::disconnect()
+{
+ if (mState != CONNECTED && mState != CONNECTING)
+ return;
+
+ mState = IDLE;
+
+ if (mWorkerThread)
+ {
+ SDL_WaitThread(mWorkerThread, NULL);
+ mWorkerThread = NULL;
+ }
+ SDLNet_TCP_Close(mSocket);
+}
+
+void Network::registerHandler(MessageHandler *handler)
+{
+ const Uint16 *i = handler->handledMessages;
+
+ while(*i)
+ {
+ mMessageHandlers[*i] = handler;
+ i++;
+ }
+
+ handler->setNetwork(this);
+}
+
+void Network::unregisterHandler(MessageHandler *handler)
+{
+ for (const Uint16 *i = handler->handledMessages; *i; i++)
+ {
+ mMessageHandlers.erase(*i);
+ }
+
+ handler->setNetwork(0);
+}
+
+void Network::clearHandlers()
+{
+ MessageHandlerIterator i;
+ for (i = mMessageHandlers.begin(); i != mMessageHandlers.end(); i++)
+ {
+ i->second->setNetwork(0);
+ }
+ mMessageHandlers.clear();
+}
+
+void Network::dispatchMessages()
+{
+ while (messageReady())
+ {
+ MessageIn msg = getNextMessage();
+
+ MessageHandlerIterator iter = mMessageHandlers.find(msg.getId());
+
+ if (iter != mMessageHandlers.end())
+ iter->second->handleMessage(&msg);
+ /*else
+ logger->log("Unhandled packet: %x", msg.getId());*/
+
+ skip(msg.getLength());
+ }
+}
+
+void Network::flush()
+{
+ if (!mOutSize || mState != CONNECTED)
+ return;
+
+ int ret;
+
+
+ SDL_mutexP(mMutex);
+ ret = SDLNet_TCP_Send(mSocket, mOutBuffer, mOutSize);
+ if (ret < (int)mOutSize)
+ {
+ //logger->log("Error in SDLNet_TCP_Send(): %s", SDLNet_GetError());
+ mState = ERROR_BROKE;
+ }
+ mOutSize = 0;
+ SDL_mutexV(mMutex);
+}
+
+void Network::skip(int len)
+{
+ SDL_mutexP(mMutex);
+ mToSkip += len;
+ if (!mInSize)
+ {
+ SDL_mutexV(mMutex);
+ return;
+ }
+
+ if (mInSize >= mToSkip)
+ {
+ mInSize -= mToSkip;
+ memmove(mInBuffer, mInBuffer + mToSkip, mInSize);
+ mToSkip = 0;
+ }
+ else
+ {
+ mToSkip -= mInSize;
+ mInSize = 0;
+ }
+ SDL_mutexV(mMutex);
+}
+
+bool Network::messageReady()
+{
+ int len = -1;
+
+ SDL_mutexP(mMutex);
+ if (mInSize >= 2)
+ {
+ len = packet_lengths[readWord(0)];
+
+ if (len == -1 && mInSize > 4)
+ len = readWord(2);
+
+ }
+
+ bool ret = (mInSize >= static_cast<unsigned int>(len));
+ SDL_mutexV(mMutex);
+
+ return ret;
+}
+
+MessageIn Network::getNextMessage()
+{
+ while (!messageReady())
+ {
+ if (mState == ERROR_BROKE)
+ break;
+ }
+
+ SDL_mutexP(mMutex);
+ int msgId = readWord(0);
+ int len = packet_lengths[msgId];
+
+ if (len == -1)
+ len = readWord(2);
+
+#ifdef DEBUG
+ printf("Received packet 0x%x of length %d\n", msgId, length);
+#endif
+
+ MessageIn msg(mInBuffer, len);
+ SDL_mutexV(mMutex);
+
+ return msg;
+}
+
+bool Network::realConnect()
+{
+ IPaddress ipAddress;
+
+ if (SDLNet_ResolveHost(&ipAddress, mAddress.c_str(), mPort) == -1)
+ {
+ //logger->log("Error in SDLNet_ResolveHost(): %s", SDLNet_GetError());
+ mState = ERROR_BROKE;
+ return false;
+ }
+
+ mState = CONNECTING;
+
+ mSocket = SDLNet_TCP_Open(&ipAddress);
+ if (!mSocket)
+ {
+ //logger->log("Error in SDLNet_TCP_Open(): %s", SDLNet_GetError());
+ mState = ERROR_BROKE;
+ return false;
+ }
+
+ /*logger->log("Network::Started session with %s:%i",
+ iptostring(ipAddress.host), ipAddress.port);*/
+
+ mState = CONNECTED;
+
+ return true;
+}
+
+void Network::receive()
+{
+ SDLNet_SocketSet set;
+
+ if (!(set = SDLNet_AllocSocketSet(1)))
+ {
+ //logger->log("Error in SDLNet_AllocSocketSet(): %s", SDLNet_GetError());
+ mState = ERROR_BROKE;
+ return;
+ }
+
+ if (SDLNet_TCP_AddSocket(set, mSocket) == -1)
+ {
+ //logger->log("Error in SDLNet_AddSocket(): %s", SDLNet_GetError());
+ mState = ERROR_BROKE;
+ }
+
+ while (mState == CONNECTED)
+ {
+ // TODO Try to get this to block all the time while still being able
+ // to escape the loop
+ int numReady = SDLNet_CheckSockets(set, ((Uint32)500));
+ int ret;
+ switch (numReady)
+ {
+ case -1:
+ // logger->log("Error: SDLNet_CheckSockets");
+ // FALLTHROUGH
+ case 0:
+ break;
+
+ case 1:
+ // Receive data from the socket
+ SDL_mutexP(mMutex);
+ ret = SDLNet_TCP_Recv(mSocket, mInBuffer + mInSize, BUFFER_SIZE - mInSize);
+
+ if (!ret)
+ {
+ // We got disconnected
+ mState = ERROR_BROKE; //IDLE - changed to error to force a restart.
+ //logger->log("Disconnected.");
+ //state = LOGIN_STATE;
+ }
+ else if (ret < 0)
+ {
+ //logger->log("Error in SDLNet_TCP_Recv(): %s", SDLNet_GetError());
+ mState = ERROR_BROKE;
+ }
+ else {
+ mInSize += ret;
+ if (mToSkip)
+ {
+ if (mInSize >= mToSkip)
+ {
+ mInSize -= mToSkip;
+ memmove(mInBuffer, mInBuffer + mToSkip, mInSize);
+ mToSkip = 0;
+ }
+ else
+ {
+ mToSkip -= mInSize;
+ mInSize = 0;
+ }
+ }
+ }
+ SDL_mutexV(mMutex);
+ break;
+
+ default:
+ // more than one socket is ready..
+ // this should not happen since we only listen once socket.
+ //logger->log("Error in SDLNet_TCP_Recv(), %d sockets are ready : %s", numReady, SDLNet_GetError());
+ mState = ERROR_BROKE;
+ break;
+ }
+ }
+
+ if (SDLNet_TCP_DelSocket(set, mSocket) == -1)
+ {
+ //logger->log("Error in SDLNet_DelSocket(): %s", SDLNet_GetError());
+ }
+
+ SDLNet_FreeSocketSet(set);
+}
+
+char *iptostring(int address)
+{
+ static char asciiIP[16];
+
+ sprintf(asciiIP, "%i.%i.%i.%i",
+ (unsigned char)(address),
+ (unsigned char)(address >> 8),
+ (unsigned char)(address >> 16),
+ (unsigned char)(address >> 24));
+
+ return asciiIP;
+}
+
+Uint16 Network::readWord(int pos)
+{
+#if SDL_BYTEORDER == SDL_BIG_ENDIAN
+ return SDL_Swap16((*(Uint16*)(mInBuffer+(pos))));
+#else
+ return (*(Uint16*)(mInBuffer+(pos)));
+#endif
+}
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