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ANetwork.cpp

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/*
CS Senior Project 2003
Team : Leftfield
Project : ModernWarfare
Members :
- Russ Christensen              <rchriste@cs.utah.edu>
- Todd Smith                    <tcsmith@cs.utah.edu>
- Usit Duongsaa                 <duongsaa@cs.utah.edu>
Copyright 2003 Russ Christensen, Usit Duongsaa, and Todd Smith. All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 
Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 
THIS SOFTWARE IS PROVIDED BY RUSS CHRISTENSEN, USIT DUONGSAA, AND TODD SMITH ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RUSS, USIT, TODD OR OTHER CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include "AEngine.h"
#include "AUtil.h"
#include "ASharedFunc.h"
#include "AState.h"

GUID netGuid =  { 0x809af2bd, 0x7881, 0x468b, { 0xa5, 0x3c, 0x48, 0xd5, 0x48, 0x69, 0x0, 0xd9 } };

//------------------------------------------------------------------------------------
NDX_Connect& net_direct()
{
        return AS.net_ndxConnect;
}
//------------------------------------------------------------------------------------
void net_runAsServer(string myIP, string myName, int maxNumPlayers)
{
        NDX_Connect &net = AS.net_ndxConnect;
        if(!net.Create(&netGuid)) throw Error("Can't create DirectPlay");

        net.SetGuarenteed(true);
        if(!net.ConnectTCPIP( (char*)myIP.c_str() ))  throw Error("Can't connect to Server : " + myIP );
        if(!net.CreateGame("Aierra Engine Game", (char*)myName.c_str(), maxNumPlayers ))
                throw Error("Can't Create Game");

        AS.net_isServer = true;
        AS.net_myName = myName;
        AS.net_serverSendQueue.resize(0);
        AS.net_gameFinalized = false;
        AS.net_myPlayerNum = -1;
        AS.net_isInit = true;
        AS.net_isFakeServer = false;
}
//------------------------------------------------------------------------------------
void net_runAsFakeServer(string myName, int maxNumPlayers)
{
        AS.net_isServer = true;
        AS.net_myName = myName;
        AS.net_serverSendQueue.resize(0);
        AS.net_gameFinalized = false;
        AS.net_myPlayerNum = -1;
        AS.net_isInit = true;
        AS.net_isFakeServer = true;
}
//------------------------------------------------------------------------------------
bool net_connectToServer(string ip, string myName)
{
        NDX_Connect &net = AS.net_ndxConnect;
        if(!net.Create(&netGuid))
        {
                sys_console() << "Can't create DirectPlay" << endl;
                return false;
        }

        net.SetGuarenteed(true);
        if(!net.ConnectTCPIP( (char*)ip.c_str() ))
        {
                sys_console() << "Can't connect to Server : " << ip << endl;
                return false;
        }
        
        net.ScanForGames(20,false);                     // spend 20 millisec searching for a game
        if(net.NumGames>0)      
        {               
                if(!net.JoinGame(0, (char*)myName.c_str()))
                {
                        sys_console() << "Can't Join Game" << endl;
                        return false;
                }
        }
        else 
        {
                sys_console() << "No Game Found on that server" << endl;
                return false;
        }

        AS.net_isServer = false;
        AS.net_myName = myName;
        AS.net_serverSendQueue.resize(0);
        AS.net_myPlayerNum = -1;
        AS.net_isInit = true;
        return true;
}
//------------------------------------------------------------------------------------
void net_acceptMorePlayers()
{
        if(AS.net_isFakeServer) return;
        if(AS.net_gameFinalized) throw Error("Game already finalized.  Can't accept more players");
        AS.net_ndxConnect.ScanForPlayers();
}
//------------------------------------------------------------------------------------
// helper function for net_recv, server mode.  broadcast msg to all players (excluding server itself)
void net_broadcast( string &msg )
{       
        if(AS.net_isFakeServer) return;
        AS.net_ndxConnect.Send( DPID_ALLPLAYERS, &msg[0], (DWORD)msg.length()+1 );
}
//------------------------------------------------------------------------------------
void net_finalizeGame()
{
        NDX_Connect &net = AS.net_ndxConnect;
        for( int i=0; i<net.NumPlayers; i++ )
        {
                ostringstream strm;
                strm << "Assign <begin_name>" << net.Players[i].Name << "<end_name> " << i;
                net_send( strm.str() );

                if( AS.net_myName == net.Players[i].Name )  AS.net_myPlayerNum = i;                     // server's own number
        }

        // broadcast server DPID
        ostringstream strm;
        strm << "ServerDPID " << AS.net_ndxConnect.LocalDPID;
        net_broadcast( strm.str() );
}
//------------------------------------------------------------------------------------
bool net_amIServer()
{
        return AS.net_isServer;
}
//------------------------------------------------------------------------------------
vector<string> net_getAllPlayers()
{
        vector<string> result;
        
        if(AS.net_isFakeServer)
        {
                result.push_back(AS.net_myName);
                return result;
        }

        NDX_Connect &net = AS.net_ndxConnect;
        if(!AS.net_gameFinalized)  net.ScanForPlayers();
        
        for( int i=0; i<net.NumPlayers; i++ )
                result.push_back( net.Players[i].Name );

        return result;
}
//------------------------------------------------------------------------------------
void net_send( string msg )
{
        if(!AS.net_isInit) return;
        msg += "\0";
        if(AS.net_isServer)             // server, add to send queue
        {
                AS.net_serverSendQueue.push_back(msg);
        }
        else                                    // clients, just send it to server
        {
                AS.net_ndxConnect.Send( AS.net_serverDPID, &msg[0], (DWORD)msg.length()+1 );
        }
}
//------------------------------------------------------------------------------------
string net_getPlayerName()
{
        return AS.net_myName;
}
//------------------------------------------------------------------------------------
int net_getPlayerNumber()
{
        return AS.net_myPlayerNum;
}
//------------------------------------------------------------------------------------
void net_disconnect()
{
        AS.net_ndxConnect.CloseGame();
        AS.net_ndxConnect.CloseConnection();    
}
//------------------------------------------------------------------------------------
string net_recv()
{
        if(!AS.net_isInit) return "";
        NDX_Connect &net = AS.net_ndxConnect;

        if(AS.net_isServer)             // server, check send queue first
        {
                if( AS.net_serverSendQueue.size()>0 )
                {
                        string s = *AS.net_serverSendQueue.begin();
                        AS.net_serverSendQueue.pop_front();
                        net_broadcast(s);
                        if( s.find("Assign <begin_name>")==0 )                          // player number assignment
                        {

                                sys_console() << s << endl;

                                s = s.substr(19);                                       // skip header
                                int i = (int)s.find("<end_name>");      // delete footer
                                string name = s.substr(0,i);
                                

                                string numStr = s.substr(i+10);         // skip footer
                                istringstream numStrm(numStr.c_str());
                                int num;
                                numStrm >> num;
                                
                                if( name==AS.net_myName )   AS.net_myPlayerNum = num;                   // it's me!  Store my number
                                AS.net_mapNameToNum[name] = num;
                                AS.net_mapNumToName[num]  = name;
                                
                                return net_recv();                                      // grab another msg
                        }
                        return s;
                }
                else if(!AS.net_isFakeServer)                                                   // if nothing in queue, do actual recv
                {
                        if(!net.Receive()) return "";
                        if(net.FromDPID==DPID_SYSMSG) return net_recv();        // it's a system msg, try again
                        string s((char*)net.RBuffer);                   
                        net_broadcast(s);
                        return s;

                }
        }
        else                                    // clients, just send it to server
        {
                if(!net.Receive()) return "";
                if(net.FromDPID==DPID_SYSMSG) return net_recv();        // it's a system msg, try again
                string s((char*)net.RBuffer);
                if( s.find("Assign <begin_name>")==0 )                          // player number assignment
                {

                        sys_console() << s << endl;

                        s = s.substr(19);                                       // skip header
                        int i = (int)s.find("<end_name>");      // delete footer
                        string name = s.substr(0,i);
                        

                        string numStr = s.substr(i+10);         // skip footer
                        istringstream numStrm(numStr.c_str());
                        int num;
                        numStrm >> num;
                        
                        if( name==AS.net_myName )
                        {
                                AS.net_myPlayerNum = num;                       // it's me!  Store my number
                                sys_console() << "My num is " << num << endl;
                        }
                        AS.net_mapNameToNum[name] = num;
                        AS.net_mapNumToName[num]  = name;
                        sys_console() << "mapping " << name << " to " << num << endl;
                        
                        return net_recv();                                      // grab another msg
                }
                else if (s.find("ServerDPID")==0 )
                {
                        string tmp;
                        istringstream strm(s);
                        strm >> tmp >> AS.net_serverDPID;
                        return net_recv();
                }
                
                return s;
        }

        return "";
}
//------------------------------------------------------------------------------------
int net_getPlayerNumUsingName(string playerName)
{
        map<string,int>::iterator iter = AS.net_mapNameToNum.find(playerName);
        if( iter==AS.net_mapNameToNum.end() ) return 0;
        return (iter)->second;
}
//------------------------------------------------------------------------------------
string net_getPlayerNameUsingNum(int num)
{
        map<int,string>::iterator iter = AS.net_mapNumToName.find(num);
        if( iter==AS.net_mapNumToName.end() ) return "NoNamePlayer";
        return (iter)->second;
}
//------------------------------------------------------------------------------------
string net_getSelfIP()
{
        static bool init = false;
        if(!init)
        {
                init = true;
                WSAData wsa;
                WSAStartup( MAKEWORD(1,1), &wsa );
        }

        char hostName[500];     
        int rc = gethostname(&hostName[0],499); 
        if(rc!=0) rc = WSAGetLastError();
        assert(rc != WSAEFAULT);
        assert(rc != WSANOTINITIALISED  );
        assert(rc != WSAENETDOWN );
        assert(rc != WSAEINPROGRESS );  

        struct hostent *phost = gethostbyname(hostName);
        char oip[50];
        for (int i = 0; phost->h_addr_list[i] != 0; ++i)
        {
                struct in_addr addr;
                memcpy(&addr, phost->h_addr_list[i], sizeof(struct in_addr));           
                strcpy(oip,inet_ntoa(addr));            
                break;
        }

        return string(oip);
}
//------------------------------------------------------------------------------------

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