// Server side C/C++ program to demonstrate Socket
// programming
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
#include <iostream>
#define PORT 8080
using namespace std;

int main(int argc, char const* argv[])
{
	int server_fd, new_socket, valread;
	struct sockaddr_in address;
	int opt = 1;
	int addrlen = sizeof(address);
	//char buffer[1024] = { 0 };
	char* buffer = "";
	char* hello = "Hello from server";
    
	// Creating socket file descriptor
	if ((server_fd = socket(AF_INET, SOCK_STREAM, 0))
		== 0) {
		perror("socket failed");
		exit(EXIT_FAILURE);
	}

//if (setsockopt(server_fd, SOL_SOCKET,SO_REUSEADDR | SO_REUSEPORT, &opt,sizeof(opt)))
	// Forcefully attaching socket to the port 8080
	if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR , &opt, sizeof(opt))) {
		perror("setsockopt");
		exit(EXIT_FAILURE);
	}
	address.sin_family = AF_INET;
	address.sin_addr.s_addr = INADDR_ANY;
	address.sin_port = htons(PORT);

	// Forcefully attaching socket to the port 8080
	if (bind(server_fd, (struct sockaddr*)&address,
			sizeof(address))
		< 0) {
		perror("bind failed");
		exit(EXIT_FAILURE);
	}
    // to run forever 
	while(1){
		if (listen(server_fd, 3) < 0) {
			perror("listen");
			exit(EXIT_FAILURE);
		}
		if ((new_socket
			= accept(server_fd, (struct sockaddr*)&address,
					(socklen_t*)&addrlen))
			< 0) {
			perror("accept");
			exit(EXIT_FAILURE);
		}
		valread = read(new_socket, buffer, 1024);
		printf("message in %s\n", buffer);
		//cout<<*buffer;
		send(new_socket, hello, strlen(hello), 0);
		printf("Hello message sent\n");
		char *result=new char();
		strcpy(result,buffer);
		printf("string copied = %s\n source =%s", result, buffer);
	   if(strcmp(result,(char *)"1")==0) 	{int ret = execl ("/bin/ls", "ls", "-1", (char *)0);}
	    else   if(strcmp(result,"2")==0)   {printf("beeeep");}
	   		else if(strcmp(result,"3")==0) 	{printf("%s\n", "Client sent 3 to terminate the server"); break;}			

	} // end the while statement 

// closing the connected socket
	close(new_socket);
// closing the listening socket
	shutdown(server_fd, SHUT_RDWR);
	return 0;
}