Thread: Queries on Server/Client Battleship Program

Hi all, I'm new to client/server TCP socket programming. Just want to get some help to run this program...

Code:

#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <iostream>
#include <fstream>
#include <strings.h>
#include <stdlib.h>
#include <string>


using namespace std;
int clientside (int);


int main(int argc, char *argv[])
{
	int connfd, pid, portNo, listenfd;
	socklen_t len;
	bool loop = false;
	struct sockaddr_in servaddr, client_addr;


	//make sure the user setting up server enters in correct arguments
    	if (argc < 2)
    	{
        	cerr << "Syntax : ./server <port>" << endl;
        	return 0;
    	}


	portNo = atoi(argv[1]);	
	//only allows user setting up server to enter a certain range of port number
	if((portNo>65535) || (portNo<2000))
	{
		cerr<<"Please enter port number between 2000 - 65535"<<endl;
		return 0;
	}


    	listenfd = socket(AF_INET, SOCK_STREAM, 0);
	//error msg if socket cannot be opened
	if (listenfd < 0)
	{
		cout<<"Cannot open socket!"<<endl;
		return 0;
	}


    	bzero((char *) &servaddr,sizeof(servaddr));
	servaddr.sin_family = AF_INET;
    	servaddr.sin_addr.s_addr = INADDR_ANY;
    	servaddr.sin_port = htons(portNo);


	//error msg if hostname and ip address cannot be binded
    	if(bind(listenfd,(struct sockaddr *)&servaddr,sizeof(servaddr)) < 0)
	{
		cout<<"Cannot bind!"<<endl;
		return 0;
	}     	listen(listenfd,5);
    	len = sizeof(client_addr);


	//endless while loop for server to keep listening for incoming connections
    	while (loop==false)
    	{
		cout<<"Listening....."<<endl;	
        	connfd = accept(listenfd,(struct sockaddr *)&client_addr,&len);


		//error msg if server cannot accept incoming connection
		if (connfd < 0)
		{
			cout<<"Cannot accept connection!"<<endl;
			return 0;
		}	


		//everytime a connection is made, the parent fork out a copy
		//this allows multiple connections to the server
        	pid = fork();
        	if (pid < 0)
        	{
            		cerr << "ERROR forking!" << endl;;
            		return 0;
        	}
        	if (pid == 0)
        	{
			close(listenfd);
            		clientside(connfd);//reading client's attacked coordinate
			return 0;
       		}
        	else 
		{
			close(connfd);
		}
    	}
    	return 0;		
}


//function to handle the file and comparision
int clientside (int connfd)
{
	bool questFound = false;
    	char test[150];
	char warship[150];
	char shipgrid[150];
	char exitCheck[] = "exit";
	char temp[150];
	string fline;
	string::size_type pos;


    	bzero(test,151);
    	read(connfd,test,150);// client's attacked coordinate  stored in test
	//open the warship and shipgrid file
	ifstream infile;
	infile.open("position.txt");
	strcpy(temp,test);


	//case insensitive for 'exit'
	for(int i=0;i<strlen(temp);i++)
	{
		temp[i] = toupper(temp[i]);
	}


	//if client enters 'exit', server will be notified
	if(strcmp(temp,exitCheck)==0)
	{
		cout<<"Client has disconnected!"<<endl;
		cout<<"Listening....."<<endl;
	}
	else
	{
		//server displays msg from client - showing client attacked co-ordinate in variable test
		cout << "Message Received: " << test << endl;


		for(int i=0;i<strlen(test);i++)
		{
			test[i] = toupper(test[i]);
		}


	    	if (!infile)
	    	{
			cout << "Cannot open file" << endl;
			return 0;
	    	}
	    	else
	    	{
			//extracts data from file and compare
			while (getline(infile, fline) && questFound == false)
			{
		    		//cout<<fline<<endl;
					pos = fline.find(test, 0);


				      // ??? Need help here..
	
			}
			//if warship not found, display this
		 	if (questFound == false)
	   	 	{
	   		 	write(connfd,"Missed",999);
	   	
			}			
			//close file
			infile.close();}}}