#include	"unp.h"
#include	<time.h>
#include <stdio.h>

int
main(int argc, char **argv)
{
	int					listenfd, connfd;
	socklen_t		clilen, n;
	struct sockaddr_in	servaddr, cliaddr;
	char				buff[MAXLINE];
	time_t				ticks;
	FILE *fp;

	listenfd = Socket(AF_INET, SOCK_STREAM, 0);

	bzero(&servaddr, sizeof(servaddr));
	servaddr.sin_family      = AF_INET;
	servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
	servaddr.sin_port        = htons(13);	/* daytime server */

	Bind(listenfd, (SA *) &servaddr, sizeof(servaddr));

	Listen(listenfd, LISTENQ);

        if ((fp = fopen("np13s_hw1_serv.log", "a")) == NULL) {
           printf("log file open error!\n");
           exit(0);
        };

	for ( ; ; ) {
                clilen = sizeof(cliaddr);
		connfd = Accept(listenfd, (SA *) &cliaddr, &clilen);
	       ticks = time(NULL);
                fprintf(fp, "===================\n");
                fprintf (fp, "%.24s: connected from %s, port %d\n",
                ctime(&ticks),
                Inet_ntop(AF_INET, &cliaddr.sin_addr, buff, sizeof (buff)),
                        ntohs(cliaddr.sin_port));
                        srand((int) ticks);
               n = read(connfd, buff, sizeof(buff));
               if (n <= 0) 
                  fprintf(fp, "id not received!\n");
               else {
		  buff[n] = 0;
	          fprintf(fp, "id = %s\n", buff);
 	          ticks = time(NULL);
 	          snprintf(buff, sizeof(buff), "%.24s\r\n", ctime(&ticks));
 	          if (write(connfd, buff, strlen(buff)) < 0)
                     fprintf(fp, "write error!\n");
               };
 	       fprintf (fp, "%.24s: disconnected from %s, port %d\n",
                      ctime(&ticks),
                      Inet_ntop(AF_INET, &cliaddr.sin_addr, buff, sizeof (buff)),
                      ntohs(cliaddr.sin_port));
               fflush(fp);

		Close(connfd);
	}
}