Subversion Repositories Games.Chess Giants

// network.cpp

#include "common.h"

// prototypes of local functions

static void EvaluateServerReply (player_t *player);

bool Network_Init (void)

{

   // this function initializes the network subsystem on operating systems that require it

#ifdef _WIN32

   static bool is_winsock_initialized = false;

   WSADATA wsa_data;

   if (!is_winsock_initialized)

      is_winsock_initialized = (WSAStartup (MAKEWORD (2, 2), &wsa_data) == 0);

   return (is_winsock_initialized); // return whether the network subsystem was successfully initialized

#else // !_WIN32

   return (true); // all other systems than Win32 don't need to initialize the network

#endif // _WIN32

}

bool PlayerNetwork_Init (player_t *player)

{

   // this function initializes the network layer and connects to the chess server

   struct hostent *hostinfo;

   struct sockaddr_in service;

   unsigned long nonblocking_mode;

   char ascii_hostname[256];

   onlineplayers = NULL; // ensure the online players array is empty

   onlineplayer_count = 0; // and reset the online players count

   onlineplayers_updated = false;

   soughtgames = NULL; // ensure the sought games array is empty

   soughtgame_count = 0; // and reset the sought games count

   soughtgames_updated = false;

   lastsought_time = 0;

   chatterchannels = NULL; // ensure the chatter channels array is empty

   chatterchannel_count = 0; // and reset the chatter channels count

   chatterchannels_updated = false;

   selected_chatterchannel = NULL;

   PlayerCards_Init (); // initialize the player cards array

   Challenges_Init (); // initialize the challenges array

   Interlocutors_Init (); // initialize the interlocutors array

   server_motd[0] = 0; // reset the server MOTD

   player->is_connected = false; // remember we aren't connected yet

   player->is_logged_in = false; // and not logged in either

   player->is_in_game = false; // we aren't in game either

   player->game_number = 0;

   player->remaining_seconds = 0;

   player->our_socket = INVALID_SOCKET; // and that we have no socket yet

   player->name[0] = 0; // player name undefined

   // initialize the network subsystem if required

   if (!Network_Init ())

   {

      messagebox.hWndParent = hMainWnd;

      wcscpy_s (messagebox.title, WCHAR_SIZEOF (messagebox.title), LOCALIZE (L"ImportantMessage"));

      wcscpy_s (messagebox.text, WCHAR_SIZEOF (messagebox.text), LOCALIZE (L"Error_NetworkInitializationFailed"));

      messagebox.flags = MB_ICONWARNING | MB_OK;

      DialogBox_Message (&messagebox); // display a modeless error message box

      PlayerNetwork_Shutdown (player); // on error, shutdown the network and display an error message

      return (false);

   }

   // get the chess server's IP address from the host name

   ConvertTo7BitASCII (ascii_hostname, sizeof (ascii_hostname), options.network.server_address);

   hostinfo = gethostbyname (ascii_hostname);

   if (hostinfo == NULL)

   {

      messagebox.hWndParent = hMainWnd;

      wcscpy_s (messagebox.title, WCHAR_SIZEOF (messagebox.title), LOCALIZE (L"ImportantMessage"));

      wcscpy_s (messagebox.text, WCHAR_SIZEOF (messagebox.text), LOCALIZE (L"Error_NetworkInitializationFailed"));

      messagebox.flags = MB_ICONWARNING | MB_OK;

      DialogBox_Message (&messagebox); // display a modeless error message box

      PlayerNetwork_Shutdown (player); // on error, shutdown the network and display an error message

      return (false);

   }

   // fill in the sockaddr server structure with the server hostinfo data

   service.sin_family = AF_INET;

   service.sin_addr.s_addr = inet_addr (inet_ntoa (*(struct in_addr *) hostinfo->h_addr_list[0]));

   service.sin_port = htons (options.network.server_port);

   // create our socket

   if ((player->our_socket = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP)) == INVALID_SOCKET)

   {

      messagebox.hWndParent = hMainWnd;

      wcscpy_s (messagebox.title, WCHAR_SIZEOF (messagebox.title), LOCALIZE (L"ImportantMessage"));

      wcscpy_s (messagebox.text, WCHAR_SIZEOF (messagebox.text), LOCALIZE (L"Error_NetworkInitializationFailed"));

      messagebox.flags = MB_ICONWARNING | MB_OK;

      DialogBox_Message (&messagebox); // display a modeless error message box

      PlayerNetwork_Shutdown (player); // on error, shutdown the network and display an error message

      return (false);

   }

   // connect the game to the chess server using that socket

   if (connect (player->our_socket, (struct sockaddr *) &service, sizeof (service)) == -1)

   {

      messagebox.hWndParent = hMainWnd;

      wcscpy_s (messagebox.title, WCHAR_SIZEOF (messagebox.title), LOCALIZE (L"ImportantMessage"));

      wcscpy_s (messagebox.text, WCHAR_SIZEOF (messagebox.text), LOCALIZE (L"Error_NetworkInitializationFailed"));

      messagebox.flags = MB_ICONWARNING | MB_OK;

      DialogBox_Message (&messagebox); // display a modeless error message box

      PlayerNetwork_Shutdown (player); // on error, shutdown the network and display an error message

      return (false);

   }

   // set it to be non-blocking (but only AFTER the connection is made)

   nonblocking_mode = 1;

   if (ioctlsocket (player->our_socket, FIONBIO, &nonblocking_mode) == SOCKET_ERROR)

   {

      messagebox.hWndParent = hMainWnd;

      wcscpy_s (messagebox.title, WCHAR_SIZEOF (messagebox.title), LOCALIZE (L"ImportantMessage"));

      wcscpy_s (messagebox.text, WCHAR_SIZEOF (messagebox.text), LOCALIZE (L"Error_NetworkInitializationFailed"));

      messagebox.flags = MB_ICONWARNING | MB_OK;

      DialogBox_Message (&messagebox); // display a modeless error message box

      PlayerNetwork_Shutdown (player); // on error, shutdown the network and display an error message

      return (false);

   }

   // initialize the debug log file

   Debug_Init (L"Chess server output.txt");

   player->is_connected = true; // remember we are connected

   return (true); // finished, we have a valid, connected socket

}

void PlayerNetwork_Shutdown (player_t *player)

{

   // this function shutdowns the network layer

   int chatterchannel_index;

   // shutdown the socket if it is open. This will disconnect us from the server.

   if (player->our_socket != INVALID_SOCKET)

      closesocket (player->our_socket); // close the network socket

   player->our_socket = INVALID_SOCKET;

   player->is_connected = false; // remember we are no longer connected

   player->is_logged_in = false; // and not logged in either

   player->is_in_game = false; // we aren't in game either

   player->game_number = 0;

   player->remaining_seconds = 0;

   player->name[0] = 0; // player name undefined

   server_motd[0] = 0; // reset the server MOTD

   // cycle through all chatter channels we know...

   for (chatterchannel_index = 0; chatterchannel_index < chatterchannel_count; chatterchannel_index++)

   {

      SAFE_free ((void **) &chatterchannels[chatterchannel_index].members); // free their member list

      chatterchannels[chatterchannel_index].member_count = 0; // reset their members count

   }

   SAFE_free ((void **) &chatterchannels); // free the chatter channels array

   chatterchannel_count = 0; // and reset the chatter channels count

   chatterchannels_updated = false;

   selected_chatterchannel = NULL;

   SAFE_free ((void **) &soughtgames); // free the sought games array

   soughtgame_count = 0; // and reset the sought games count

   soughtgames_updated = false;

   SAFE_free ((void **) &onlineplayers); // free the online players array

   onlineplayer_count = 0; // and reset the online players count

   onlineplayers_updated = false;

   Interlocutors_Shutdown (); // shutdown the interlocutors

   Challenges_Shutdown (); // shutdown the challenges

   PlayerCards_Shutdown (); // shutdown the player cards

   // shutdown all possible opened UI windows

   if (IsWindow (hChatterChannelsWnd))

      DestroyWindow (hChatterChannelsWnd);

   hChatterChannelsWnd = NULL;

   if (IsWindow (hGamesWnd))

      DestroyWindow (hGamesWnd);

   hGamesWnd = NULL;

   if (IsWindow (hMOTDWnd))

      DestroyWindow (hMOTDWnd);

   hMOTDWnd = NULL;

   if (IsWindow (hOpponentsWnd))

      DestroyWindow (hOpponentsWnd);

   hOpponentsWnd = NULL;

   if (IsWindow (hSoughtWnd))

      DestroyWindow (hSoughtWnd);

   hSoughtWnd = NULL;

   // shutdown WinSock

   WSACleanup ();

   return; // finished

}

bool PlayerNetwork_Think (player_t *player)

{

   // this function is called once per game tick to listen to the network and react to what the server tells us. Returns TRUE

   // if we need to update the scene.

   player_t *local_player;

   char *block_start;

   char *block_end;

   char *ascii_sendbuffer; // mallocated

   wchar_t *widechar_buffer; // mallocated

   wchar_t *widechar_line;

   int send_retval;

   int recv_retval;

   int byte_index;

   int rewrite_index;

   int length;

   bool do_update;

   // are we NOT connected yet ?

   if (!player->is_connected)

      return (false); // consistency check: if we aren't connected, don't do anything

   // are we NOT logged in yet AND is our socket valid AND is there nothing in the center of the screen yet ?

   if (!player->is_logged_in && (player->our_socket != INVALID_SOCKET) && !the_scene.gui.central_text.is_displayed)

   {

      Scene_UpdateText (&the_scene.gui.central_text, RGBA_TO_RGBACOLOR (255, 255, 255, 191), DURATION_INFINITE, true, LOCALIZE (L"Connecting")); // display "connecting" in the middle of the screen

      the_scene.gui.want_spinwheel = true; // start spinning wheel

   }

   do_update = false; // assume we don't need to update the scene until told otherwise

   ////////////////////////////

   // BEGIN listening to server

   // proceed in filling the ascii buffer with what's coming

   // get a hand on the end of the player's recv buffer and compute its remaining size

   length = strlen (player->ascii_recvbuffer);

   // if the server sent us something, append it to what we've received

   recv_retval = recv (player->our_socket, &player->ascii_recvbuffer[length], player->recvbuffer_size - length, 0);

   if (recv_retval > 0)

   {

      // parse all received data and eradicate all carriage returns. Also convert %'s to a safer glyph.

      rewrite_index = 0;

      for (byte_index = 0; byte_index < recv_retval; byte_index++)

         if (player->ascii_recvbuffer[length + byte_index] != '\r')

         {

            if (player->ascii_recvbuffer[length + byte_index] == '%')

               player->ascii_recvbuffer[length + rewrite_index] = '¤';

            else

               player->ascii_recvbuffer[length + rewrite_index] = player->ascii_recvbuffer[length + byte_index];

            rewrite_index++;

         }

      player->ascii_recvbuffer[length + rewrite_index] = 0; // terminate the buffer ourselves

      length = strlen (player->ascii_recvbuffer); // and update the new recvbuffer's length

   }

   else if (recv_retval == SOCKET_ERROR)

   {

      recv_retval = WSAGetLastError (); // ask Windows to be more specific about the error

      if (recv_retval == WSAEWOULDBLOCK)

         ; // it's okay. We're a non-blocking socket.

      else if (recv_retval == WSAETIMEDOUT)

      {

         messagebox.hWndParent = hMainWnd;

         wcscpy_s (messagebox.title, WCHAR_SIZEOF (messagebox.title), LOCALIZE (L"ImportantMessage"));

         wcscpy_s (messagebox.text, WCHAR_SIZEOF (messagebox.text), LOCALIZE (L"Error_ConnectionToChessServerLost"));

         messagebox.flags = MB_ICONWARNING | MB_OK;

         DialogBox_Message (&messagebox); // display a modeless error message box

         PlayerNetwork_Shutdown (player); // on error, shutdown the network and display an error message

         return (false);

      }

   }

   // END listening to server

   //////////////////////////

   //////////////////////////////////

   // BEGIN evaluating server replies

   // are we NOT logged in yet ?

   if (!player->is_logged_in)

   {

      // is it a login prompt ?

      if ((length > 7) && (strcmp (&player->ascii_recvbuffer[length - 7], "login: ") == 0))

      {

         Player_SendBuffer_Add (player, 1000, L"%s\n", options.network.login); // send the login string

         player->ascii_recvbuffer[0] = 0; // and discard recvbuffer as we've processed this message

      }

      // else is it a password prompt ?

      else if (((length > 10) && (strcmp (&player->ascii_recvbuffer[length - 10], "password: ") == 0))

               || ((length > 3) && (strcmp (&player->ascii_recvbuffer[length - 3], "\":\n") == 0)))

      {

         Player_SendBuffer_Add (player, 1000, L"%s\n", options.network.password); // send the password string

         player->ascii_recvbuffer[0] = 0; // and discard recvbuffer as we've processed this message

      }

      // else is it a confirmation that we've successfully logged in ?

      else if (((block_start = strstr (player->ascii_recvbuffer, "\n**** Starting FICS session as ")) != NULL)

               && (block_end = strstr (player->ascii_recvbuffer, " ****\n")))

      {

         player->is_logged_in = true; // remember we are logged in

         the_scene.gui.central_text.disappear_time = current_time + 1.0f; // fade the "connecting" phrase out now (FIXME: ugly)

         the_scene.gui.want_spinwheel = false; // stop spinning wheel

         do_update = true; // and update the scene

         block_start += 31; // skip the "\n**** Starting FICS session as " substring

         local_player = Player_FindByType (PLAYER_HUMAN); // get a pointer to the local player

         // copy out local player's login name, as reported by server, and convert it to wchar_t

         for (byte_index = 0; (byte_index < WCHAR_SIZEOF (local_player->name)) && isalpha (block_start[byte_index]); byte_index++)

            local_player->name[byte_index] = (wchar_t) block_start[byte_index]; // copy nickname one character after the other. Very dirty conversion.

         if (byte_index < WCHAR_SIZEOF (local_player->name))

            local_player->name[byte_index] = 0; // finish the string ourselves

         else

            local_player->name[WCHAR_SIZEOF (local_player->name) - 1] = 0; // truncate it if neeeded

         server_motd[0] = 0; // remember we haven't read the MOTD yet

         the_board.reevaluate = true; // reeevaluate the board (to update the title bar)

         // see if there's more data to parse after this message, in which case move it in place

         length = strlen (block_end + 6);

         if (length > 0)

            memmove (player->ascii_recvbuffer, block_end + 6, length + 1);

         else

            player->ascii_recvbuffer[0] = 0; // else discard recvbuffer as we've processed this message

      }

   }

   // else we are logged in

   else

   {

      // see if we have a complete reply block (remember: percent sign was replaced with '¤')

      block_end = strstr (player->ascii_recvbuffer, "\nfics¤ ");

      // as long as we can find some...

      while (block_end != NULL)

      {

         *block_end = 0; // break the string here

         // convert the block to wide char and evaluate it, taking action if needed

         ConvertToWideChar (player->recvbuffer, player->recvbuffer_size, player->ascii_recvbuffer);

         Debug_Log (L"RECEIVED:[%s]\n", player->recvbuffer); // log what we've received

         EvaluateServerReply (player); // and evaluate it

         // see if there's more data to parse after this message, in which case move it in place

         length = strlen (block_end + 7);

         if (length > 0)

            memmove (player->ascii_recvbuffer, block_end + 7, length + 1);

         else

         {

            player->ascii_recvbuffer[0] = 0;

            break; // it was the last prompt, so discard recvbuffer as we've processed this message

         }

         block_end = strstr (player->ascii_recvbuffer, "\nfics¤ "); // remember: percent sign was replaced with '¤'

      }

   }

   // END evaluating server replies

   ////////////////////////////////

   // have we been notified that the current player just changed ?

   if (player->should_wakeup)

   {

      // has at least one move been played AND is it the remote player's turn now ?

      if ((the_board.move_count > 1) && (Board_ColorToMove (&the_board) == player->color))

      {

         Debug_Log (L"===Local player just played, sending the chosen move to chess server===\n");

         Player_SendBuffer_Add (player, 1000, L"%s\n", the_board.moves[the_board.move_count - 1].pgntext); // send the move string to the chess server

      }

      player->should_wakeup = false; // remember we took this notification into account

   }

   // has the user entered some chatter text ?

   if (!the_scene.gui.is_entering_text && (the_scene.gui.entered_ccreply.text != NULL))

   {

      // is player logged in AND has a chatter channel been selected ? if so, send chat string to server

      if (player->is_logged_in && (selected_chatterchannel != NULL))

         Player_SendBuffer_Add (player, 1000, L"+channel %d\ntell %d %s\n", selected_chatterchannel->id, selected_chatterchannel->id, the_scene.gui.entered_ccreply.text);

      // reset the entered text buffer

      SAFE_free ((void **) &the_scene.gui.entered_ccreply.text); // reset the entered text buffer

      the_scene.gui.entered_ccreply.text_length = 0; // and set its length to zero

   }

   // does the local player want to cancel its last move ? this can be either HIS move or HIS OPPONENTS's move...

   local_player = Player_FindByType (PLAYER_HUMAN); // get a pointer to the local player

   if ((local_player != NULL) && local_player->wants_cancel)

   {

      Player_SendBuffer_Add (player, 1000, L"takeback\n"); // send the takeback request to our opponent

      Interlocutor_Notify (Interlocutor_FindOrCreate (player->name), LOCALIZE (L"Chat_TakebackRequestSent"), player->name); // send a notification to its chat window

      the_board.game_state = STATE_PLAYING; // remember the game is now playing (in case we wanted to cancel the closing move of a finished game, this opens the game again)

      local_player->wants_cancel = false; // don't do this all day long

   }

   if (player->wants_cancel)

   {

      Player_SendBuffer_Add (player, 1000, L"takeback\n"); // send the takeback request to our opponent

      Interlocutor_Notify (Interlocutor_FindOrCreate (player->name), LOCALIZE (L"Chat_TakebackRequestSent"), player->name); // send a notification to its chat window

      the_board.game_state = STATE_PLAYING; // remember the game is now playing (in case we wanted to cancel the closing move of a finished game, this opens the game again)

      player->wants_cancel = false; // don't do this all day long

   }

   // if we have something to send, do it

   if (!player->sendbuffer_locked && (player->sendbuffer[0] != 0) && (animation_endtime + 1.0f < current_time))

   {

      // log what we're sending

      Debug_Log (L"SENDING:[%s]\n", player->sendbuffer);

      player->sendbuffer_locked = true; // lock the buffer

      // now read line per line (mallocate a line buffer as large as necessary)

      length = wcslen (player->sendbuffer) + 1 + 1; // +1 for \n, +1 for null terminator

      ascii_sendbuffer = (char *) SAFE_malloc (length, sizeof (char), false);

      widechar_buffer = (wchar_t *) SAFE_malloc (length, sizeof (wchar_t), false);

      widechar_line = player->sendbuffer; // start at the first character

      while ((widechar_line = wcsgets (widechar_buffer, length, widechar_line)) != NULL)

      {

         wcscat_s (widechar_buffer, length, L"\n"); // put the carriage return back

         ConvertTo7BitASCII (ascii_sendbuffer, length, widechar_buffer); // convert to ASCII

         send_retval = send (player->our_socket, ascii_sendbuffer, strlen (ascii_sendbuffer), 0); // send data

      }

      SAFE_free ((void **) &widechar_buffer); // we no longer need the line buffer, so free it

      SAFE_free ((void **) &ascii_sendbuffer);

      player->sendbuffer[0] = 0; // what we had to send has been sent, reset the send buffer

      player->sendbuffer_locked = false; // and unlock it

      // did send() report an error ?

      if (send_retval == SOCKET_ERROR)

      {

         messagebox.hWndParent = hMainWnd;

         wcscpy_s (messagebox.title, WCHAR_SIZEOF (messagebox.title), LOCALIZE (L"ImportantMessage"));

         wcscpy_s (messagebox.text, WCHAR_SIZEOF (messagebox.text), LOCALIZE (L"Error_ConnectionToChessServerLost"));

         messagebox.flags = MB_ICONERROR | MB_OK;

         DialogBox_Message (&messagebox); // display a modeless error message box

         PlayerNetwork_Shutdown (player); // on error, shutdown the network and display an error message

         return (true); // on error, cancel

      }

   }

   return (do_update); // finished

}

static void EvaluateServerReply (player_t *player)

{

   // this function parses a network reply and evaluates it, deciding what to do

   //////////////////////

   // OUT OF GAME REPLIES

   // the MOTD is the first reply to be evaluated

   EvaluateServerReply_MOTD (player);

   // evaluate dangerous replies first, i.e. those that contain user-settable text

   EvaluateServerReply_Announcement (player);

   EvaluateServerReply_ChannelMessage (player);

   EvaluateServerReply_PrivateMessage (player);

   EvaluateServerReply_Finger (player);

   // the less dangerous replies can now be evaluated without ambiguity

   EvaluateServerReply_Seek (player);

   EvaluateServerReply_Challenge (player);

   EvaluateServerReply_ChallengeAccepted (player);

   EvaluateServerReply_ChallengeDeclined (player);

   EvaluateServerReply_Takeback (player);

   EvaluateServerReply_TakebackDeclinedByOther (player);

   EvaluateServerReply_TakebackDeclinedByYou (player);

   EvaluateServerReply_PlayNotAllowed (player);

   EvaluateServerReply_PlayUnexistent (player);

   EvaluateServerReply_PlayWrongRating (player);

   EvaluateServerReply_ChannelsAndMembers (player);

   EvaluateServerReply_SoughtList (player);

   EvaluateServerReply_PlayersList (player);

   //////////////////

   // IN GAME REPLIES

   EvaluateServerReply_GameStarting (player);

   EvaluateServerReply_GameState (player);

   EvaluateServerReply_GameResults (player);

   return; // finished evaluating this reply

}