/*
Fatemeh Hosseini
This is a simple server program which recieves data from client,
modifies the message and send it back to the client.
For running this example, first run server.c then run client.c.
Selected port is 8001 which is the same for both client and server.
You can put any other random number between 1000 and 65535 for port. 
I have commented do{}while to make it easier for testing.
*/

#include<stdio.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<stdlib.h>
#include<string.h>

int main(int argc, char *argv[])
{
	/* Variables */
	int sock;
	char* pch;
	struct sockaddr_in server;
	int mysock;
	char buff[1024];
	char m[1024]={};
	char buff1[1024]={};
	char* s=" back from ";
	int rval;
	int i=0;
	
	/* Create socket */
	sock = socket(AF_INET, SOCK_STREAM, 0);   //TCP/IP Socket
	if (sock<0)//check failure
	{
		perror("failed to create socket");
		exit(1);
	}
	printf("Socket has been created\n");
	server.sin_family=AF_INET;
	server.sin_addr.s_addr=INADDR_ANY;
	server.sin_port=htons(8001);
	
	/* call bind*/
	if(bind(sock, (struct sockaddr *)&server, sizeof(server)) < 0)
	{
	 perror("bind failed");
	 exit(1);	
	}
	printf("Binding was successful\n");

	/* Listen */
	listen(sock, 5);
	printf("Server is listening to the port\n");
	/* Accept */
	//do{
	mysock=accept(sock, (struct sockaddr *) 0, 0);
		if(mysock == -1)
		{
			perror("accept failed");
		}
		else
		{
			printf("Connection is accepted\n");
			memset(buff,0,sizeof(buff));
			if((rval = recv(mysock, buff, sizeof(buff), 0)) < 0)
				perror("reading stream message error");
			else if (rval==0)
				printf("ending connection\n");
			else
				printf("MSG: %s\n",buff);
			printf("got the message(rval = %d)\n", rval);
			strcpy(m,buff);
			pch=strtok(m," ");
				while (pch!=NULL)
				{
				i++;
				 if(i==2)
					{
						strcat(buff1,s);
						strcat(buff1,pch);
					}
				 else
					{
						printf("token:%s\n",pch);
						strcat(buff1,pch);
					}
				 pch=strtok(NULL," ");
				}
			if(send(mysock,buff1, sizeof(buff1),0)<0)
				printf("server sent failed");
			close(mysock);
			
		}
	//}while(1);

	return 0;
}