/*
 *  socket_server_simple.c
 * 
 *
 *  Created by Angelos Stavrou on 9/16/08.
 *  Copyright 2008 George Mason University. All rights reserved.
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/wait.h>
#include <signal.h>

#define MYPORT 15000    // the port users will be connecting to

#define MAXDATASIZE 1400 // max number of bytes we can get at once 
char buf[MAXDATASIZE];

int main(void)
{
	int sockfd, new_fd;  // listen on sock_fd, new connection on new_fd
	int numbytes;
	struct sockaddr_in local_addr;    // my address information
	struct sockaddr_in remote_addr; // connector's address information
	socklen_t sin_size;
	struct sigaction sa;
	int yes=1;
	
	if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
		perror("socket");
		exit(1);
	}
	
	if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1) {
		perror("setsockopt");
		exit(1);
	}
	
	local_addr.sin_family = AF_INET;         // host byte order
	local_addr.sin_port = htons(MYPORT);     // short, network byte order
	local_addr.sin_addr.s_addr = INADDR_ANY; // automatically fill with my IP
	memset(local_addr.sin_zero, '\0', sizeof local_addr.sin_zero);
	
	if (bind(sockfd, (struct sockaddr *)&local_addr, sizeof local_addr) == -1) {
		perror("bind");
		exit(1);
	}
	
	if (listen(sockfd, 1) == -1) {
		perror("listen");
		exit(1);
	}
	
	while(1) {  // main accept() loop
		sin_size = sizeof remote_addr;
		if ((new_fd = accept(sockfd, (struct sockaddr *)&remote_addr, \
												 &sin_size)) == -1) {
			perror("accept");
			continue;
		}
		printf("server: got connection from %s\n", inet_ntoa(remote_addr.sin_addr));
		if ((numbytes=recv(new_fd, buf, MAXDATASIZE-1, 0)) == -1) {
			perror("recv");
			exit(1);
		}
		buf[numbytes] = '\0';
		printf("Received from %s: %s \n", inet_ntoa(remote_addr.sin_addr), buf);
		fflush(stdout);
		if (send(new_fd, "I have received your message!\n", 32, 0) == -1)
				perror("send");
		close(new_fd);  // parent doesn't need this
	}

}