source: network-game/server/server.cpp@ 1d96513

#include <cstdlib>
#include <cstdio>
#include <unistd.h>
#include <string>
#include <iostream>
#include <sstream>
#include <fstream>
#include <cstring>
#include <cmath>

#include <vector>
#include <map>

#include <csignal>

#include <sys/time.h>

#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <crypt.h>

/*
#include <openssl/bio.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
*/

#include "../common/Compiler.h"
#include "../common/Common.h"
#include "../common/MessageProcessor.h"
#include "../common/WorldMap.h"
#include "../common/Player.h"
#include "../common/Projectile.h"
#include "../common/Game.h"

#include "DataAccess.h"

using namespace std;

bool done;

// from used to be const. Removed that so I could take a reference
// and use it to send messages
bool processMessage(const NETWORK_MSG &clientMsg, struct sockaddr_in &from, MessageProcessor &msgProcessor, map<unsigned int, Player*>& mapPlayers, map<string, Game*>& mapGames, WorldMap* gameMap, unsigned int& unusedPlayerId, NETWORK_MSG &serverMsg, int sock, int &scoreBlue, int &scoreRed, ofstream& outputLog);

void updateUnusedPlayerId(unsigned int& id, map<unsigned int, Player*>& mapPlayers);
void updateUnusedProjectileId(unsigned int& id, map<unsigned int, Projectile>& mapProjectiles);
Player *findPlayerByName(map<unsigned int, Player*> &m, string name);
Player *findPlayerByAddr(map<unsigned int, Player*> &m, const sockaddr_in &addr);
void damagePlayer(Player *p, int damage);

void addObjectToMap(WorldMap::ObjectType objectType, int x, int y, WorldMap* gameMap, map<unsigned int, Player*>& mapPlayers, MessageProcessor &msgProcessor, int sock, ofstream& outputLog);

// this should probably go somewhere in the common folder
void error(const char *msg)
{
    perror(msg);
    exit(0);
}

void quit(int sig) {
   done = true;
}

int main(int argc, char *argv[])
{
   int sock, length, n;
   struct sockaddr_in server;
   struct sockaddr_in from; // info of client sending the message
   NETWORK_MSG clientMsg, serverMsg;
   MessageProcessor msgProcessor;
   map<unsigned int, Player*> mapPlayers;
   map<unsigned int, Projectile> mapProjectiles;
   map<string, Game*> mapGames;
   unsigned int unusedPlayerId = 1, unusedProjectileId = 1;
   int scoreBlue, scoreRed;
   ofstream outputLog;

   done = false;

   scoreBlue = 0;
   scoreRed = 0;

   signal(SIGINT, quit);

   //SSL_load_error_strings();
   //ERR_load_BIO_strings();
   //OpenSSL_add_all_algorithms();

   if (argc != 2)
   {
      cerr << "ERROR, expected server [domain] [port]" << endl;
      exit(1);
   }

   outputLog.open("server.log", ios::app);
   outputLog << "Started server on " << getCurrentDateTimeString() << endl;

   WorldMap* gameMap = WorldMap::loadMapFromFile("../data/map.txt");

   // add some items to the map. They will be sent out
   // to players when they login
   for (int y=0; y<gameMap->height; y++)
   {
      for (int x=0; x<gameMap->width; x++)
      {
         switch (gameMap->getStructure(x, y))
         {
            case WorldMap::STRUCTURE_BLUE_FLAG:
               gameMap->addObject(WorldMap::OBJECT_BLUE_FLAG, x*25+12, y*25+12);
               break;
            case WorldMap::STRUCTURE_RED_FLAG:
               gameMap->addObject(WorldMap::OBJECT_RED_FLAG, x*25+12, y*25+12);
               break;
         }
      }
   }

   sock = socket(AF_INET, SOCK_DGRAM, 0);
   if (sock < 0)
      error("Opening socket");
   length = sizeof(server);
   bzero(&server,length);
   server.sin_family=AF_INET;
   server.sin_port=htons(atoi(argv[1]));
   server.sin_addr.s_addr=INADDR_ANY;
   if ( bind(sock, (struct sockaddr *)&server, length) < 0 ) 
      error("binding");

   set_nonblock(sock);

   bool broadcastResponse;
   timespec ts;
   int timeLastUpdated = 0, curTime = 0, timeLastBroadcast = 0;
   while (!done)
   {
      usleep(5000);

      clock_gettime(CLOCK_REALTIME, &ts);
      // make the number smaller so millis can fit in an int
      ts.tv_sec -= 1368000000;
      curTime = ts.tv_sec*1000 + ts.tv_nsec/1000000;

      if (timeLastUpdated == 0 || (curTime-timeLastUpdated) >= 50)
      {
         timeLastUpdated = curTime;

         msgProcessor.cleanAckedMessages(&outputLog);
         msgProcessor.resendUnackedMessages(sock, &outputLog);

         map<unsigned int, Player*>::iterator it;

         cout << "Updating player targets and respawning dead players" << endl;

         // set targets for all chasing players (or make them attack if they're close enough)
         for (it = mapPlayers.begin(); it != mapPlayers.end(); it++)
         {
            Player* p = it->second;

            // check if it's time to revive dead players
            if (p->isDead)
            {
               if (getCurrentMillis() - p->timeDied >= 10000)
               {
                  p->isDead = false;

                  POSITION spawnPos;
 
                  switch (p->team)
                  {
                  case 0:// blue team
                     spawnPos = gameMap->getStructureLocation(WorldMap::STRUCTURE_BLUE_FLAG);
                     break;
                  case 1:// red team
                     spawnPos = gameMap->getStructureLocation(WorldMap::STRUCTURE_RED_FLAG);
                     break;
                  default:
                     // should never go here
                     cout << "Error: Invalid team" << endl;
                     break;
                  }

                  // spawn the player to the right of their flag location
                  spawnPos.x = (spawnPos.x+1) * 25 + 12;
                  spawnPos.y = spawnPos.y * 25 + 12;

                  p->pos = spawnPos.toFloat();
                  p->target = spawnPos;
                  p->health = p->maxHealth;

                  serverMsg.type = MSG_TYPE_PLAYER;
                  p->serialize(serverMsg.buffer);

                  map<unsigned int, Player*>::iterator it2;
                  for (it2 = mapPlayers.begin(); it2 != mapPlayers.end(); it2++)
                  {
                     if ( msgProcessor.sendMessage(&serverMsg, sock, &(p->addr), &outputLog) < 0 )
                        error("sendMessage");
                  }
               }

               continue;
            }

            if (p->currentGame != NULL) {
               map<unsigned int, Player*> playersInGame = p->currentGame->getPlayers();
               if (p->updateTarget(playersInGame))
               {
                  serverMsg.type = MSG_TYPE_PLAYER;
                  p->serialize(serverMsg.buffer);

                  map<unsigned int, Player*>::iterator it2;
                  for (it2 = playersInGame.begin(); it2 != playersInGame.end(); it2++)
                  {
                     if ( msgProcessor.sendMessage(&serverMsg, sock, &(it2->second->addr), &outputLog) < 0 )
                        error("sendMessage");
                  }
               }
            }
         }

         cout << "Processing players in a game" << endl;

         // process players currently in a game
         FLOAT_POSITION oldPos;
         for (it = mapPlayers.begin(); it != mapPlayers.end(); it++)
         {
            Player* p = it->second;
            if (p->currentGame == NULL)
               continue;

            cout << "moving player" << endl;
            bool broadcastMove = false;

            // xompute playersInGame here

            // move player and perform associated tasks
            oldPos = p->pos;
            if (p->move(p->currentGame->getMap())) {

               cout << "player moved" << endl;
               if (p->currentGame->processPlayerMovement(p, oldPos))
                   broadcastMove = true;
               cout << "player move processed" << endl;

               map<unsigned int, Player*>& playersInGame = p->currentGame->getPlayers();

               WorldMap::ObjectType flagType;
               POSITION pos;
               bool flagTurnedIn = false;
               bool flagReturned = false;
               bool ownFlagAtBase = false;

               // need to figure out how to move this to a different file
               // while still sending back flag type and position
               WorldMap* playerMap = p->currentGame->getMap();
               switch(playerMap->getStructure(p->pos.x/25, p->pos.y/25))
               {
                  case WorldMap::STRUCTURE_BLUE_FLAG:
                  {
                     if (p->team == 0 && p->hasRedFlag)
                     {
                        // check that your flag is at your base
                        pos = playerMap->getStructureLocation(WorldMap::STRUCTURE_BLUE_FLAG);
                        
                        vector<WorldMap::Object>* vctObjects = playerMap->getObjects();
                        vector<WorldMap::Object>::iterator itObjects;

                        for (itObjects = vctObjects->begin(); itObjects != vctObjects->end(); itObjects++)
                        {
                           if (itObjects->type == WorldMap::OBJECT_BLUE_FLAG)
                           {
                              if (itObjects->pos.x == pos.x*25+12 && itObjects->pos.y == pos.y*25+12)
                              {
                                 ownFlagAtBase = true;
                                 break;
                              }
                           }
                        }

                        if (ownFlagAtBase)
                        {
                           p->hasRedFlag = false;
                           flagType = WorldMap::OBJECT_RED_FLAG;
                           pos = playerMap->getStructureLocation(WorldMap::STRUCTURE_RED_FLAG);
                           flagTurnedIn = true;
                           scoreBlue++;
                        }
                     }

                     break;
                  }
                  case WorldMap::STRUCTURE_RED_FLAG:
                  {
                     if (p->team == 1 && p->hasBlueFlag)
                     {
                        // check that your flag is at your base
                        pos = playerMap->getStructureLocation(WorldMap::STRUCTURE_RED_FLAG);
                        
                        vector<WorldMap::Object>* vctObjects = playerMap->getObjects();
                        vector<WorldMap::Object>::iterator itObjects;

                        for (itObjects = vctObjects->begin(); itObjects != vctObjects->end(); itObjects++)
                        {
                           if (itObjects->type == WorldMap::OBJECT_RED_FLAG)
                           {
                              if (itObjects->pos.x == pos.x*25+12 && itObjects->pos.y == pos.y*25+12)
                              {
                                 ownFlagAtBase = true;
                                 break;
                              }
                           }
                        }

                        if (ownFlagAtBase)
                        {
                           p->hasBlueFlag = false;
                           flagType = WorldMap::OBJECT_BLUE_FLAG;
                           pos = playerMap->getStructureLocation(WorldMap::STRUCTURE_BLUE_FLAG);
                           flagTurnedIn = true;
                           scoreRed++;
                        }
                     }

                     break;
                  }
               }

               if (flagTurnedIn)
               {
                  // send an OBJECT message to add the flag back to its spawn point
                  pos.x = pos.x*25+12;
                  pos.y = pos.y*25+12;
                  playerMap->addObject(flagType, pos.x, pos.y);

                  serverMsg.type = MSG_TYPE_OBJECT;
                  playerMap->getObjects()->back().serialize(serverMsg.buffer);

                  map<unsigned int, Player*>::iterator it2;
                  
                  for (it2 = playersInGame.begin(); it2 != playersInGame.end(); it2++)
                  {
                     if ( msgProcessor.sendMessage(&serverMsg, sock, &(it2->second->addr), &outputLog) < 0 )
                        error("sendMessage");
                  }

                  serverMsg.type = MSG_TYPE_SCORE;
                  memcpy(serverMsg.buffer, &scoreBlue, 4);
                  memcpy(serverMsg.buffer+4, &scoreRed, 4);

                  for (it2 = playersInGame.begin(); it2 != playersInGame.end(); it2++)
                  {
                     if ( msgProcessor.sendMessage(&serverMsg, sock, &(it2->second->addr), &outputLog) < 0 )
                        error("sendMessage");
                  }

                  // this means a PLAYER message will be sent
                  broadcastMove = true;
               }

               // go through all objects and check if the player is close to one and if its their flag
               vector<WorldMap::Object>* vctObjects = playerMap->getObjects();
               vector<WorldMap::Object>::iterator itObjects;
               POSITION structPos;

               for (itObjects = vctObjects->begin(); itObjects != vctObjects->end(); itObjects++)
               {
                  POSITION pos = itObjects->pos;

                  if (posDistance(p->pos, pos.toFloat()) < 10)
                  {
                     if (p->team == 0 && 
                         itObjects->type == WorldMap::OBJECT_BLUE_FLAG)
                     {
                        structPos = playerMap->getStructureLocation(WorldMap::STRUCTURE_BLUE_FLAG);
                        flagReturned = true;
                        break;
                     }
                     else if (p->team == 1 &&
                              itObjects->type == WorldMap::OBJECT_RED_FLAG)
                     {
                        structPos = playerMap->getStructureLocation(WorldMap::STRUCTURE_RED_FLAG);
                        flagReturned = true;
                        break;
                     }
                  }
               }

               if (flagReturned)
               {
                  itObjects->pos.x = structPos.x*25+12;
                  itObjects->pos.y = structPos.y*25+12;

                  serverMsg.type = MSG_TYPE_OBJECT;
                  itObjects->serialize(serverMsg.buffer);

                  map<unsigned int, Player*>::iterator it2;
                  for (it2 = playersInGame.begin(); it2 != playersInGame.end(); it2++)
                  {
                     if ( msgProcessor.sendMessage(&serverMsg, sock, &(it2->second->addr), &outputLog) < 0 )
                        error("sendMessage");
                  }
               }

               if (broadcastMove)
               {
                  cout << "broadcasting player move" << endl;
                  serverMsg.type = MSG_TYPE_PLAYER;
                  p->serialize(serverMsg.buffer);

                  // only broadcast message to other players in the same game
                  cout << "about to broadcast move" << endl;

                  map<unsigned int, Player*>::iterator it2;
                  for (it2 = playersInGame.begin(); it2 != playersInGame.end(); it2++)
                  {
                     if ( msgProcessor.sendMessage(&serverMsg, sock, &(it2->second->addr), &outputLog) < 0 )
                        error("sendMessage");
                  }
                  cout << "done broadcasting player move" << endl;
               }
            }

            cout << "processing player attack" << endl;

            // check if the player's attack animation is complete
            if (p->isAttacking && p->timeAttackStarted+p->attackCooldown <= getCurrentMillis())
            {
               p->isAttacking = false;
               cout << "Attack animation is complete" << endl;

               //send everyone an ATTACK message
               cout << "about to broadcast attack" << endl;

               serverMsg.type = MSG_TYPE_ATTACK; 
               memcpy(serverMsg.buffer, &p->id, 4);
               memcpy(serverMsg.buffer+4, &p->targetPlayer, 4);

               map<unsigned int, Player*>& playersInGame = p->currentGame->getPlayers();
               map<unsigned int, Player*>::iterator it2;
               for (it2 = playersInGame.begin(); it2 != playersInGame.end(); it2++)
               {
                  if ( msgProcessor.sendMessage(&serverMsg, sock, &(it2->second->addr), &outputLog) < 0 )
                     error("sendMessage");
               }

               if (p->attackType == Player::ATTACK_MELEE)
               {
                  cout << "Melee attack" << endl;

                  Player* target = playersInGame[p->targetPlayer];
                  damagePlayer(target, p->damage);

                  if (target->isDead)
                  {
                     WorldMap::ObjectType flagType = WorldMap::OBJECT_NONE;
                     if (target->hasBlueFlag)
                        flagType = WorldMap::OBJECT_BLUE_FLAG;
                     else if (target->hasRedFlag)
                        flagType = WorldMap::OBJECT_RED_FLAG;

                     if (flagType != WorldMap::OBJECT_NONE) {
                        addObjectToMap(flagType, target->pos.x, target->pos.y, p->currentGame->getMap(), playersInGame, msgProcessor, sock, outputLog);
                     }
                  }

                  serverMsg.type = MSG_TYPE_PLAYER;
                  target->serialize(serverMsg.buffer);
               }
               else if (p->attackType == Player::ATTACK_RANGED)
               {
                  cout << "Ranged attack" << endl;

                  Projectile proj(p->pos.x, p->pos.y, p->targetPlayer, p->damage);
                  proj.id = unusedProjectileId;
                  updateUnusedProjectileId(unusedProjectileId, mapProjectiles);
                  mapProjectiles[proj.id] = proj;

                  int x = it->second->pos.x;
                  int y = it->second->pos.y;

                  serverMsg.type = MSG_TYPE_PROJECTILE;
                  memcpy(serverMsg.buffer, &proj.id, 4);
                  memcpy(serverMsg.buffer+4, &x, 4);
                  memcpy(serverMsg.buffer+8, &y, 4);
                  memcpy(serverMsg.buffer+12, &it->second->targetPlayer, 4);
               }
               else
                  cout << "Invalid attack type: " << it->second->attackType << endl;

               // broadcast either a PLAYER or PROJECTILE message
               cout << "Broadcasting player or projectile message" << endl;
               for (it2 = playersInGame.begin(); it2 != playersInGame.end(); it2++)
               {
                  if (msgProcessor.sendMessage(&serverMsg, sock, &(it2->second->addr), &outputLog) < 0 )
                     error("sendMessage");
               }
               cout << "Done broadcasting" << endl;
            }
         }

         cout << "Processing projectiles"  << endl;

         // move all projectiles
         // see if this can be moved inside the game class
         map<unsigned int, Projectile>::iterator itProj;
         for (itProj = mapProjectiles.begin(); itProj != mapProjectiles.end(); itProj++)
         {
            cout << "About to call projectile move" << endl;
            if (itProj->second.move(mapPlayers))
            {
               // send a REMOVE_PROJECTILE message
               cout << "send a REMOVE_PROJECTILE message" << endl;
               serverMsg.type = MSG_TYPE_REMOVE_PROJECTILE;
               memcpy(serverMsg.buffer, &itProj->second.id, 4);
               mapProjectiles.erase(itProj->second.id);

               map<unsigned int, Player*>::iterator it2;
               cout << "Broadcasting REMOVE_PROJECTILE" << endl;
               for (it2 = mapPlayers.begin(); it2 != mapPlayers.end(); it2++)
               {
                  if ( msgProcessor.sendMessage(&serverMsg, sock, &(it2->second->addr), &outputLog) < 0 )
                     error("sendMessage");
               }

               cout << "send a PLAYER message after dealing damage" << endl;
               // send a PLAYER message after dealing damage
               Player* target = mapPlayers[itProj->second.target];

               damagePlayer(target, itProj->second.damage);

               if (target->isDead)
               {
                  WorldMap::ObjectType flagType = WorldMap::OBJECT_NONE;
                  if (target->hasBlueFlag)
                     flagType = WorldMap::OBJECT_BLUE_FLAG;
                  else if (target->hasRedFlag)
                     flagType = WorldMap::OBJECT_RED_FLAG;

                  if (flagType != WorldMap::OBJECT_NONE)
                     addObjectToMap(flagType, target->pos.x, target->pos.y, gameMap, mapPlayers, msgProcessor, sock, outputLog);
               }

               serverMsg.type = MSG_TYPE_PLAYER;
               target->serialize(serverMsg.buffer);

               cout << "Sending a PLAYER message" << endl;
               for (it2 = mapPlayers.begin(); it2 != mapPlayers.end(); it2++)
               {
                  if ( msgProcessor.sendMessage(&serverMsg, sock, &(it2->second->addr), &outputLog) < 0 )
                     error("sendMessage");
               }
            }
            cout << "Projectile was not moved" << endl;
         }
      }

      n = msgProcessor.receiveMessage(&clientMsg, sock, &from, &outputLog);

      if (n >= 0)
      {
         broadcastResponse = processMessage(clientMsg, from, msgProcessor, mapPlayers, mapGames, gameMap, unusedPlayerId, serverMsg, sock, scoreBlue, scoreRed, outputLog);

         if (broadcastResponse)
         {
            cout << "Should be broadcasting the message" << endl;

            // needs to be updated to use the players from the game
            map<unsigned int, Player*>::iterator it;
            for (it = mapPlayers.begin(); it != mapPlayers.end(); it++)
            {
               cout << "Sent message back to " << it->second->name << endl;
               if ( msgProcessor.sendMessage(&serverMsg, sock, &(it->second->addr), &outputLog) < 0 )
                  error("sendMessage");
            }
         }
         else
         {
            cout << "Should be sending back the message" << endl;

            if ( msgProcessor.sendMessage(&serverMsg, sock, &from, &outputLog) < 0 )
               error("sendMessage");
         }

         cout << "Finished processing the message" << endl;
      }
   }

   outputLog << "Stopped server on " << getCurrentDateTimeString() << endl;
   outputLog.close();

   // delete all games
   map<string, Game*>::iterator itGames;
   for (itGames = mapGames.begin(); itGames != mapGames.end(); itGames++)
   {
      delete itGames->second;
   }

   map<unsigned int, Player*>::iterator itPlayers;
   for (itPlayers = mapPlayers.begin(); itPlayers != mapPlayers.end(); itPlayers++)
   {
      delete itPlayers->second;
   }

   return 0;
}

bool processMessage(const NETWORK_MSG &clientMsg, struct sockaddr_in &from, MessageProcessor &msgProcessor, map<unsigned int, Player*>& mapPlayers, map<string, Game*>& mapGames, WorldMap* gameMap, unsigned int& unusedPlayerId, NETWORK_MSG &serverMsg, int sock, int &scoreBlue, int &scoreRed, ofstream& outputLog)
{
   DataAccess da;

   cout << "Inside processMessage" << endl;

   cout << "Received message" << endl;
   cout << "MSG: type: " << clientMsg.type << endl;
   cout << "MSG contents: " << clientMsg.buffer << endl;

   // maybe we should make a message class and have this be a member
   bool broadcastResponse = false;

   // Check that if an invalid message is sent, the client will correctly
   // receive and display the response. Maybe make a special error msg type
   switch(clientMsg.type)
   {
      case MSG_TYPE_REGISTER:
      {
         string username(clientMsg.buffer);
         string password(strchr(clientMsg.buffer, '\0')+1);
         Player::PlayerClass playerClass;

         serverMsg.type = MSG_TYPE_REGISTER;
         memcpy(&playerClass, clientMsg.buffer+username.length()+password.length()+2, 4);

         cout << "username: " << username << endl;
         cout << "password: " << password << endl;

         if (playerClass == Player::CLASS_WARRIOR)
            cout << "class: WARRIOR" << endl;
         else if (playerClass == Player::CLASS_RANGER)
            cout << "class: RANGER" << endl;
         else {
            cout << "Unknown player class detected" << endl;
            strcpy(serverMsg.buffer, "You didn't select a class");
            break;
         }

         int error = da.insertPlayer(username, password, playerClass);

         if (error)
            strcpy(serverMsg.buffer, "Registration failed. Please try again.");
         else
            strcpy(serverMsg.buffer, "Registration successful.");

         break;
      }
      case MSG_TYPE_LOGIN:
      {
         cout << "Got login message" << endl;

         string username(clientMsg.buffer);
         string password(strchr(clientMsg.buffer, '\0')+1);

         Player* p = da.getPlayer(username);

         if (p == NULL || !da.verifyPassword(password, p->password))
         {
            strcpy(serverMsg.buffer, "Incorrect username or password");
            if (p != NULL)
               delete(p);
         }
         else if(findPlayerByName(mapPlayers, username) != NULL)
         {
            strcpy(serverMsg.buffer, "Player has already logged in.");
            delete(p);
         }
         else
         {
            updateUnusedPlayerId(unusedPlayerId, mapPlayers);
            p->id = unusedPlayerId;
            cout << "new player id: " << p->id << endl;
            p->setAddr(from);
            p->currentGame = NULL;

            // choose a random team (either 0 or 1)
            p->team = rand() % 2;

            serverMsg.type = MSG_TYPE_PLAYER;

            // tell the new player about all the existing players
            cout << "Sending other players to new player" << endl;

            map<unsigned int, Player*>::iterator it;
            for (it = mapPlayers.begin(); it != mapPlayers.end(); it++)
            {
               it->second->serialize(serverMsg.buffer);

               cout << "sending info about " << it->second->name  << endl;
               cout << "sending id " << it->second->id  << endl;
               if ( msgProcessor.sendMessage(&serverMsg, sock, &from, &outputLog) < 0 )
                  error("sendMessage");
            }

            // tell the new player about all map objects
            // (currently just the flags)
            serverMsg.type = MSG_TYPE_OBJECT;
            vector<WorldMap::Object>* vctObjects = gameMap->getObjects();
            vector<WorldMap::Object>::iterator itObjects;
            cout << "sending items" << endl;
            for (itObjects = vctObjects->begin(); itObjects != vctObjects->end(); itObjects++) {
               itObjects->serialize(serverMsg.buffer);
               cout << "sending item id " << itObjects->id  << endl;
               if ( msgProcessor.sendMessage(&serverMsg, sock, &from, &outputLog) < 0 )
                  error("sendMessage");
            }

            // send info about existing games to new player
            map<string, Game*>::iterator itGames;
            Game* g;
            int numPlayers;
            serverMsg.type = MSG_TYPE_GAME_INFO;

            for (itGames = mapGames.begin(); itGames != mapGames.end(); itGames++)
            {
               g = itGames->second;
               numPlayers = g->getNumPlayers();
               memcpy(serverMsg.buffer, &numPlayers, 4);
               strcpy(serverMsg.buffer+4, g->getName().c_str());
               if ( msgProcessor.sendMessage(&serverMsg, sock, &from, &outputLog) < 0 )
                  error("sendMessage");
            }

            // send the current score
            serverMsg.type = MSG_TYPE_SCORE;
            memcpy(serverMsg.buffer, &scoreBlue, 4);
            memcpy(serverMsg.buffer+4, &scoreRed, 4);
            if ( msgProcessor.sendMessage(&serverMsg, sock, &from, &outputLog) < 0 )
               error("sendMessage");

            serverMsg.type = MSG_TYPE_PLAYER;
            p->serialize(serverMsg.buffer);
            cout << "Should be broadcasting the message" << endl;

            for (it = mapPlayers.begin(); it != mapPlayers.end(); it++)
            {
               cout << "Sent message back to " << it->second->name << endl;
               if ( msgProcessor.sendMessage(&serverMsg, sock, &(it->second->addr), &outputLog) < 0 )
                  error("sendMessage");
            }

            mapPlayers[unusedPlayerId] = p;
         }

         serverMsg.type = MSG_TYPE_LOGIN;

         break;
      }
      case MSG_TYPE_LOGOUT:
      {
         string name(clientMsg.buffer);
         cout << "Player logging out: " << name << endl;

         Player *p = findPlayerByName(mapPlayers, name);

         if (p == NULL)
         {
            strcpy(serverMsg.buffer+4, "That player is not logged in. This is either a bug, or you're trying to hack the server.");
            cout << "Player not logged in" << endl;
         }
         else if ( p->addr.sin_addr.s_addr != from.sin_addr.s_addr ||
                   p->addr.sin_port != from.sin_port )
         {
            strcpy(serverMsg.buffer+4, "That player is logged in using a differemt connection. This is either a bug, or you're trying to hack the server.");
            cout << "Player logged in using a different connection" << endl;
         }
         else
         {
            if (!p->isDead) {
               WorldMap::ObjectType flagType = WorldMap::OBJECT_NONE;
               if (p->hasBlueFlag)
                  flagType = WorldMap::OBJECT_BLUE_FLAG;
               else if (p->hasRedFlag)
                  flagType = WorldMap::OBJECT_RED_FLAG;

               if (flagType != WorldMap::OBJECT_NONE) {
                  addObjectToMap(flagType, p->pos.x, p->pos.y, gameMap, mapPlayers, msgProcessor, sock, outputLog);
               }
            }

            // broadcast to all players before deleting p from the map
            serverMsg.type = MSG_TYPE_LOGOUT;
            memcpy(serverMsg.buffer, &p->id, 4);

            map<unsigned int, Player*>::iterator it;
            for (it = mapPlayers.begin(); it != mapPlayers.end(); it++)
            {
               cout << "Sent message back to " << it->second->name << endl;
               if ( msgProcessor.sendMessage(&serverMsg, sock, &(it->second->addr), &outputLog) < 0 )
                  error("sendMessage");
            }

            if (p->id < unusedPlayerId)
               unusedPlayerId = p->id;
            mapPlayers.erase(p->id);
            delete p;
            strcpy(serverMsg.buffer+4, "You have successfully logged out.");
         }

         serverMsg.type = MSG_TYPE_LOGOUT;

         break;
      }
      case MSG_TYPE_CHAT:
      {
         cout << "Got a chat message" << endl;

         Player *p = findPlayerByAddr(mapPlayers, from);

         if (p == NULL)
         {
            strcpy(serverMsg.buffer, "No player is logged in using this connection. This is either a bug, or you're trying to hack the server.");
         }
         else
         {
            broadcastResponse = true;

            ostringstream oss;
            oss << p->name << ": " << clientMsg.buffer;

            strcpy(serverMsg.buffer, oss.str().c_str());
         }      

         serverMsg.type = MSG_TYPE_CHAT;

         break;
      }
      case MSG_TYPE_PLAYER_MOVE:
      {
         cout << "PLAYER_MOVE" << endl;

         int id, x, y;

         memcpy(&id, clientMsg.buffer, 4);
         memcpy(&x, clientMsg.buffer+4, 4);
         memcpy(&y, clientMsg.buffer+8, 4);

         cout << "x: " << x << endl;
         cout << "y: " << y << endl;
         cout << "id: " << id << endl;
         
         Player* p = mapPlayers[id];

         if ( p->addr.sin_addr.s_addr == from.sin_addr.s_addr &&
              p->addr.sin_port == from.sin_port )
         {
            if (p->currentGame->startPlayerMovement(id, x, y)) {
               serverMsg.type = MSG_TYPE_PLAYER_MOVE;
               
               memcpy(serverMsg.buffer, &id, 4);
               memcpy(serverMsg.buffer+4, &p->target.x, 4);
               memcpy(serverMsg.buffer+8, &p->target.y, 4);

               broadcastResponse = true;
            }
            else
               cout << "Bad terrain detected" << endl;
         }
         else  // nned to send back a message indicating failure
            cout << "Player id (" << id << ") doesn't match sender" << endl;

         break;
      }
      case MSG_TYPE_PICKUP_FLAG:
      { 
         // may want to check the id matches the sender, just like for PLAYER_NOVE
         cout << "PICKUP_FLAG" << endl;

         int id;

         memcpy(&id, clientMsg.buffer, 4);
         cout << "id: " << id << endl;

         Player* p = mapPlayers[id];
         int objectId = p->currentGame->processFlagPickupRequest(p);

         if (objectId >= 0) {
            serverMsg.type = MSG_TYPE_REMOVE_OBJECT;
            memcpy(serverMsg.buffer, &objectId, 4);

            map<unsigned int, Player*> players = p->currentGame->getPlayers();
            map<unsigned int, Player*>::iterator it;
            for (it = players.begin(); it != players.end(); it++)
            {
               if ( msgProcessor.sendMessage(&serverMsg, sock, &(it->second->addr), &outputLog) < 0 )
                  error("sendMessage");
            }

         }

         // if there was no flag to pickup, we really don't need to send a message
         serverMsg.type = MSG_TYPE_PLAYER;
         p->serialize(serverMsg.buffer);

         break;
      }
      case MSG_TYPE_DROP_FLAG:
      {
         // may want to check the id matches the sender, just like for PLAYER_NOVE
         cout << "DROP_FLAG" << endl;

         int id;

         memcpy(&id, clientMsg.buffer, 4);
         cout << "id: " << id << endl;

         Player* p = mapPlayers[id];

         WorldMap::ObjectType flagType = WorldMap::OBJECT_NONE;
         if (p->hasBlueFlag)
            flagType = WorldMap::OBJECT_BLUE_FLAG;
         else if (p->hasRedFlag)
            flagType = WorldMap::OBJECT_RED_FLAG;

         addObjectToMap(flagType, p->pos.x, p->pos.y, p->currentGame->getMap(), p->currentGame->getPlayers(), msgProcessor, sock, outputLog);

         p->hasBlueFlag = false;
         p->hasRedFlag = false;

         serverMsg.type = MSG_TYPE_PLAYER;
         p->serialize(serverMsg.buffer);

         broadcastResponse = true;

         break;
      }
      case MSG_TYPE_START_ATTACK:
      {
         cout << "Received a START_ATTACK message" << endl;

         int id, targetId;

         memcpy(&id, clientMsg.buffer, 4);
         memcpy(&targetId, clientMsg.buffer+4, 4);

         // need to make sure the target is in the sender's game

         Player* source = mapPlayers[id];
         source->targetPlayer = targetId;
         source->isChasing = true;

         // this is irrelevant since the client doesn't even listen for START_ATTACK messages
         // actually, the client should not ignore this and should instead perform the same movement
         // algorithm on its end (following the target player until in range) that the server does.
         // Once the attacker is in range, the client should stop movement and wait for messages
         // from the server
         serverMsg.type = MSG_TYPE_START_ATTACK;
         memcpy(serverMsg.buffer, &id, 4);
         memcpy(serverMsg.buffer+4, &targetId, 4);
         broadcastResponse = true;

         break;
      }
      case MSG_TYPE_ATTACK:
      {
         cout << "Received am ATTACK message" << endl;
         cout << "ERROR: Clients should not send ATTACK messages" << endl;

         break;
      }
      case MSG_TYPE_CREATE_GAME:
      {
         cout << "Received a CREATE_GAME message" << endl;

         string gameName(clientMsg.buffer);
         cout << "Game name: " << gameName << endl;

         // check if this game already exists
         if (mapGames.find(gameName) != mapGames.end()) {
            cout << "Error: Game already exists" << endl;
            serverMsg.type = MSG_TYPE_JOIN_GAME_FAILURE;
            broadcastResponse = false;
            return broadcastResponse;
         }

         Game* g = new Game(gameName, "../data/map.txt");
         mapGames[gameName] = g;

         // add flag objects to the map
         WorldMap* m = g->getMap();
         for (int y=0; y<m->height; y++) {
            for (int x=0; x<m->width; x++) {
               switch (m->getStructure(x, y)) {
                  case WorldMap::STRUCTURE_BLUE_FLAG:
                     m->addObject(WorldMap::OBJECT_BLUE_FLAG, x*25+12, y*25+12);
                     break;
                  case WorldMap::STRUCTURE_RED_FLAG:
                     m->addObject(WorldMap::OBJECT_RED_FLAG, x*25+12, y*25+12);
                     break;
               }
            }
         }

         Player* p = findPlayerByAddr(mapPlayers, from);
         p->currentGame = g;

         serverMsg.type = MSG_TYPE_JOIN_GAME_SUCCESS;
         strcpy(serverMsg.buffer, gameName.c_str());
         broadcastResponse = false;

         break;
      }
      case MSG_TYPE_JOIN_GAME:
      {
         cout << "Received a JOIN_GAME message" << endl;

         string gameName(clientMsg.buffer);
         cout << "Game name: " << gameName << endl;

         // check if this game already exists
         if (mapGames.find(gameName) == mapGames.end()) {
            cout << "Error: Game does not exist" << endl;
            serverMsg.type = MSG_TYPE_JOIN_GAME_FAILURE;
            broadcastResponse = false;
            return broadcastResponse;
         }

         Game* g = mapGames[gameName];
         map<unsigned int, Player*>& players = g->getPlayers();
         Player* p = findPlayerByAddr(mapPlayers, from);

         if (players.find(p->id) != players.end()) {
            cout << "Player " << p->name << " trying to join a game he's already in" << endl;
            serverMsg.type = MSG_TYPE_JOIN_GAME_FAILURE;
            broadcastResponse = false;
            return broadcastResponse;
         }

         p->currentGame = g;

         serverMsg.type = MSG_TYPE_JOIN_GAME_SUCCESS;
         strcpy(serverMsg.buffer, gameName.c_str());
         broadcastResponse = false;

         break;
      }
      case MSG_TYPE_LEAVE_GAME:
      {
         cout << "Received a LEAVE_GAME message" << endl;

         Player* p = findPlayerByAddr(mapPlayers, from);
         Game* g = p->currentGame;

         if (g == NULL) {
            cout << "Player " << p->name << " is trying to leave a game, but is not currently in a game." << endl;

            /// should send a response back, maybe a new message type is needed

            break;
         }

         cout << "Game name: " << g->getName() << endl;
         p->currentGame = NULL;

         serverMsg.type = MSG_TYPE_LEAVE_GAME;
         memcpy(serverMsg.buffer, &p->id, 4);
         strcpy(serverMsg.buffer+4, g->getName().c_str());

         map<unsigned int, Player*>& players = g->getPlayers();

         map<unsigned int, Player*>::iterator it;
         for (it = players.begin(); it != players.end(); it++)
         {
            if ( msgProcessor.sendMessage(&serverMsg, sock, &(it->second->addr), &outputLog) < 0 )
               error("sendMessage");
         }

         g->removePlayer(p->id);

         int numPlayers = g->getNumPlayers();

         serverMsg.type = MSG_TYPE_GAME_INFO;
         memcpy(serverMsg.buffer, &numPlayers, 4);
         strcpy(serverMsg.buffer+4, g->getName().c_str());
         broadcastResponse = true;

         // if there are no more players in the game, remove it
         if (numPlayers == 0) {
            mapGames.erase(g->getName());
            delete g;
         }

         break;
      }
      case MSG_TYPE_JOIN_GAME_ACK:
      {
         cout << "Received a JOIN_GAME_ACK message" << endl;

         string gameName(clientMsg.buffer);
         cout << "Game name: " << gameName << endl;

         // check if this game already exists
         if (mapGames.find(gameName) == mapGames.end()) {
            serverMsg.type = MSG_TYPE_JOIN_GAME_FAILURE;
            broadcastResponse = false;
            return broadcastResponse;
         }

         Game* g = mapGames[gameName];

         Player* p = findPlayerByAddr(mapPlayers, from);
         p->team = rand() % 2; // choose a random team (either 0 or 1)
         p->currentGame = g; // should have been done in JOIN_GAME, so not necessary

         // tell the new player about all map objects
         // (currently just the flags)

         serverMsg.type = MSG_TYPE_OBJECT;
         vector<WorldMap::Object>* vctObjects = g->getMap()->getObjects();
         vector<WorldMap::Object>::iterator itObjects;
         cout << "sending items" << endl;
         for (itObjects = vctObjects->begin(); itObjects != vctObjects->end(); itObjects++) {
            itObjects->serialize(serverMsg.buffer);
            cout << "sending item id " << itObjects->id  << endl;
            if ( msgProcessor.sendMessage(&serverMsg, sock, &from, &outputLog) < 0 )
               error("sendMessage");
         }


         // send the current score
         serverMsg.type = MSG_TYPE_SCORE;

         int game_blueScore = g->getBlueScore();
         int game_redScore = g->getRedScore();
         memcpy(serverMsg.buffer, &game_blueScore, 4);
         memcpy(serverMsg.buffer+4, &game_redScore, 4);

         if ( msgProcessor.sendMessage(&serverMsg, sock, &from, &outputLog) < 0 )
            error("sendMessage");

         serverMsg.type = MSG_TYPE_PLAYER_JOIN_GAME;
         p->serialize(serverMsg.buffer);
         cout << "Should be broadcasting the message" << endl;

         map<unsigned int, Player*>& otherPlayers = g->getPlayers();
         map<unsigned int, Player*>::iterator it;
         for (it = otherPlayers.begin(); it != otherPlayers.end(); it++)
         {
            cout << "Sent message back to " << it->second->name << endl;
            if ( msgProcessor.sendMessage(&serverMsg, sock, &(it->second->addr), &outputLog) < 0 )
               error("sendMessage");
         }

         g->addPlayer(p);

         map<unsigned int, Player*>& allPlayers = g->getPlayers();

         // tell the new player about all the players in the game (including himself)
         cout << "Sending other players to new player" << endl;
         serverMsg.type = MSG_TYPE_PLAYER_JOIN_GAME;

         for (it = allPlayers.begin(); it != allPlayers.end(); it++)
         {
            it->second->serialize(serverMsg.buffer);

            cout << "sending info about " << it->second->name  << endl;
            cout << "sending id " << it->second->id  << endl;
            if ( msgProcessor.sendMessage(&serverMsg, sock, &from, &outputLog) < 0 )
               error("sendMessage");
         }

         int numPlayers = g->getNumPlayers();

         serverMsg.type = MSG_TYPE_GAME_INFO;
         memcpy(serverMsg.buffer, &numPlayers, 4);
         strcpy(serverMsg.buffer+4, gameName.c_str());
         broadcastResponse = true;

         break;
      }
      default:
      {
         serverMsg.type = MSG_TYPE_CHAT;
         strcpy(serverMsg.buffer, "Server error occured. Report this please.");

         break;
      }
   }

   return broadcastResponse;
}

void updateUnusedPlayerId(unsigned int& id, map<unsigned int, Player*>& mapPlayers)
{
   while (mapPlayers.find(id) != mapPlayers.end())
      id++;
}

void updateUnusedProjectileId(unsigned int& id, map<unsigned int, Projectile>& mapProjectiles)
{
   while (mapProjectiles.find(id) != mapProjectiles.end())
      id++;
}

Player *findPlayerByName(map<unsigned int, Player*> &m, string name)
{
   map<unsigned int, Player*>::iterator it;

   for (it = m.begin(); it != m.end(); it++)
   {
      if ( it->second->name.compare(name) == 0 )
         return it->second;
   }

   return NULL;
}

Player *findPlayerByAddr(map<unsigned int, Player*> &m, const sockaddr_in &addr)
{
   map<unsigned int, Player*>::iterator it;

   for (it = m.begin(); it != m.end(); it++)
   {
      if ( it->second->addr.sin_addr.s_addr == addr.sin_addr.s_addr &&
           it->second->addr.sin_port == addr.sin_port )
         return it->second;
   }

   return NULL;
}

void damagePlayer(Player *p, int damage) {
   p->health -= damage;
   if (p->health < 0)
      p->health = 0;
   if (p->health == 0) {
      cout << "Player died" << endl;
      p->isDead = true;
      p->timeDied = getCurrentMillis();
   }
}

void addObjectToMap(WorldMap::ObjectType objectType, int x, int y, WorldMap* gameMap, map<unsigned int, Player*>& mapPlayers, MessageProcessor &msgProcessor, int sock, ofstream& outputLog) {
   NETWORK_MSG serverMsg;

   gameMap->addObject(objectType, x, y);

   // need to send the OBJECT message too
   serverMsg.type = MSG_TYPE_OBJECT;
   gameMap->getObjects()->back().serialize(serverMsg.buffer);

   map<unsigned int, Player*>::iterator it;
   for (it = mapPlayers.begin(); it != mapPlayers.end(); it++)
   {
      if ( msgProcessor.sendMessage(&serverMsg, sock, &(it->second->addr), &outputLog) < 0 )
         error("sendMessage");
   }
}