int
main(int argc, char **argv)
{
int sockfd;
ssize_t n;
char buff[MAXLINE];
time_t ticks;
socklen_t len;
struct sockaddr_storage cliaddr;
if (argc == 2)
sockfd = Udp_server(NULL, argv[1], NULL);
else if (argc == 3)
sockfd = Udp_server(argv[1], argv[2], NULL);
else
err_quit("usage: daytimeudpsrv [ <host> ] <service or port>");
for ( ; ; ) {
len = sizeof(cliaddr);
n = Recvfrom(sockfd, buff, MAXLINE, 0, (SA *)&cliaddr, &len);
printf("datagram from %s\n", Sock_ntop((SA *)&cliaddr, len));
ticks = time(NULL);
snprintf(buff, sizeof(buff), "%.24s\r\n", ctime(&ticks));
Sendto(sockfd, buff, strlen(buff), 0, (SA *)&cliaddr, len);
}
}
int
main(int argc, char **argv)
{
int tfd, flags;
char buff[MAXLINE];
time_t ticks;
struct t_unitdata *tud;
if (argc == 2)
tfd = Udp_server(NULL, argv[1], NULL);
else if (argc == 3)
tfd = Udp_server(argv[1], argv[2], NULL);
else
err_quit("usage: daytimeudpsrv [ <host> ] <service or port>");
tud = T_alloc(tfd, T_UNITDATA, T_ADDR);
for ( ; ; ) {
tud->udata.maxlen = MAXLINE;
tud->udata.buf = buff;
T_rcvudata(tfd, tud, &flags);
printf("datagram from %s\n", Xti_ntop(&tud->addr));
ticks = time(NULL);
snprintf(buff, sizeof(buff), "%.24s\r\n", ctime(&ticks));
tud->udata.len = strlen(buff);
T_sndudata(tfd, tud);
}
}
int
main(int argc, char **argv)
{
int sockfd;
ssize_t n;
char buff[MAXLINE];
time_t ticks;
socklen_t len;
struct sockaddr_storage cliaddr;
if ( argc == 2)
sockfd = Udp_server( NULL, argv[1], NULL);
else if ( argc == 3)
sockfd = Udp_server( argv[1], argv[2], NULL);
else
err_quit( "usage: daytimeudpsrv [ <host> ] <service or port>");
for ( ; ; ) {
len = sizeof(cliaddr);
/* since socket is unconnected we use Recvfrom and Sendto,
* not Read, Write */
n = Recvfrom(sockfd, buff, MAXLINE, 0, (SA *)&cliaddr, &len);
printf( "datagram from %s\n", Sock_ntop((SA *)&cliaddr, len));
/* response */
time_t rawTime;
time( &rawTime);
struct tm * timeInfo;
timeInfo = localtime( &rawTime);
strftime( buff, MAXLINE, "cf16 daytime service on port 13. "
"The time on this server now is: %A, %B %d, %G %T %p-%Z\n",
timeInfo);
//ticks = time(NULL);
//snprintf(buff, sizeof(buff), "%.24s\r\n", ctime(&ticks));
Sendto( sockfd, buff, strlen(buff), 0, (SA *)&cliaddr, len);
/* At this moment we don't know if peer is reachable or not
* If it is not reachable sendto return Success but Recvfrom
* will block forever (it doesn't see an ICMP "destination
* unreachable" packet coming back from peer because socket
* is unconnected)
*/
}
}
int
main(int argc, char **argv)
{
int sockfd;
ssize_t n;
char buff[MAXLINE];
time_t ticks;
socklen_t len;
struct sockaddr_storage cliaddr;
struct addrinfo hints, *res;
int on = 1;
if (argc == 2)
sockfd = Udp_server(NULL, argv[1], NULL);
else if (argc == 3) {
bzero(&hints, sizeof(struct addrinfo));
hints.ai_flags = AI_PASSIVE;
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
if ( ( n = getaddrinfo(argv[1], argv[2], &hints, &res)) != 0)
err_quit("udp_server error for %s, %s: %s",
argv[1], argv[2], gai_strerror(n));
do {
sockfd = socket(res->ai_family, res->ai_socktype,
res->ai_protocol);
if (sockfd < 0)
continue; /* error - try next one */
Setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
&on, sizeof(on));
if (bind(sockfd, res->ai_addr, res->ai_addrlen) == 0)
break; /* success */
Close(sockfd);
} while ( (res = res->ai_next) != NULL);
if (res == NULL)
err_sys("udp_server error");
} else
err_quit("usage: daytimeudpsrv [ <host> ] <service or port>");
for ( ; ; ) {
len = sizeof(cliaddr);
n = Recvfrom(sockfd, buff, MAXLINE, 0, (SA *)&cliaddr, &len);
printf("datagram from %s\n", Sock_ntop((SA *)&cliaddr, len));
ticks = time(NULL);
snprintf(buff, sizeof(buff), "%.24s\r\n", ctime(&ticks));
Sendto(sockfd, buff, strlen(buff), 0, (SA *)&cliaddr, len);
}
}
