#include "csapp.h"
int main(int argc, char **argv)
{
int clientfd;
char *port;
char *host, buf[MAXLINE];
rio_t rio;
if (argc != 3) {
fprintf(stderr, "usage: %s <host> <port>\n", argv[0]);
exit(0);
}
host = argv[1];
port = argv[2];
clientfd = Open_clientfd(host, port);
Rio_readinitb(&rio, clientfd);
while (Fgets(buf, MAXLINE, stdin) != NULL) {
Rio_writen(clientfd, buf, strlen(buf));
Rio_readlineb(&rio, buf, MAXLINE);
Fputs(buf, stdout);
}
Close(clientfd);
exit(0);
}
/* timeserv.c - a socket-based time of day server
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <time.h>
#include <strings.h>
#define PORTNUM 13000 /* our time service phone number */
#define HOSTLEN 256
#define oops(msg) { perror(msg) ; exit(1) ; }
int main(int ac, char *av[])
{
struct sockaddr_in saddr; /* build our address here */
struct hostent *hp; /* this is part of our */
char hostname[HOSTLEN]; /* address */
int sock_id,sock_fd; /* line id, file desc */
FILE *sock_fp; /* use socket as stream */
char *ctime(); /* convert secs to string */
time_t thetime; /* the time we report */
/*
* Step 1: ask kernel for a socket
*/
sock_id = socket( PF_INET, SOCK_STREAM, 0 ); /* get a socket */
if ( sock_id == -1 )
oops( "socket" );
/*
* Step 2: bind address to socket. Address is host,port
*/
bzero( (void *)&saddr, sizeof(saddr) ); /* clear out struct */
gethostname( hostname, HOSTLEN ); /* where am I ? */
hp = gethostbyname( hostname ); /* get info about host */
/* fill in host part */
bcopy( (void *)hp->h_addr, (void *)&saddr.sin_addr, hp->h_length);
saddr.sin_port = htons(PORTNUM); /* fill in socket port */
saddr.sin_family = AF_INET ; /* fill in addr family */
if ( bind(sock_id, (struct sockaddr *)&saddr, sizeof(saddr)) != 0 )
oops( "bind" );
/*
* Step 3: allow incoming calls with Qsize=1 on socket
*/
if ( listen(sock_id, 1) != 0 )
oops( "listen" );
/*
* main loop: accept(), write(), close()
*/
int times = 0;
while ( 1 ){
sock_fd = accept(sock_id, NULL, NULL); /* wait for call */
times++;
printf("Wow! got %d calls!\n", times);
if ( sock_fd == -1 )
oops( "accept" ); /* error getting calls */
sock_fp = fdopen(sock_fd,"w"); /* we'll write to the */
if ( sock_fp == NULL ) /* socket as a stream */
oops( "fdopen" ); /* unless we can't */
thetime = time(NULL); /* get time */
/* and convert to strng */
fprintf( sock_fp, "The time here is .." );
fprintf( sock_fp, "%s", ctime(&thetime) );
fclose( sock_fp ); /* release connection */
}
}
