#include<stdio.h>
#include<unistd.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<time.h>
#include<netdb.h>
#include<stdlib.h>
#include<string.h>
#define PORT 1234
#define BACKLOG 5
 
int main()
{
	int listenfd, connectfd;
	struct sockaddr_in server;
	struct sockaddr_in client;
	socklen_t addrlen;
	
	time_t t;
	t=time(NULL);
	
	FILE *fd=fopen("/root/saveIP","a");
	if((listenfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
	{
		perror("socket() error.");
		return 0;
	}
 
	int opt = SO_REUSEADDR;
	setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
 
	bzero(&server, sizeof(server));
	server.sin_family = AF_INET;
	server.sin_port = htons(PORT);
	server.sin_addr.s_addr = htonl(INADDR_ANY);
	if(bind(listenfd, (struct sockaddr *)&server, sizeof(server)) == -1)
	{
		perror("bind() error.");
	        return 0;
 
	}
	if(listen(listenfd, BACKLOG) == -1)
	{
		perror("listen() error.");
		return 0;
	}
 
	addrlen = sizeof(client);
	if((connectfd = accept(listenfd, (struct sockaddr *)&client, &addrlen )) == -1)
   	{
    		perror("accept() error.");
		return 0;
   	}
	
	printf("Timeclient's IP is %s.  ",inet_ntoa(client.sin_addr));
	printf("Time is %s\n",ctime(&t));
	send(connectfd,(time_t *)&t,sizeof(time_t),0);
	fprintf(fd,"%s  %s\n",inet_ntoa(client.sin_addr),ctime(&t));
	fclose(fd);
	
	return 1;
}