4.3BSD-Reno/src/bin/date/date.c
/*
* Copyright (c) 1985, 1987, 1988 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that: (1) source distributions retain this entire copyright
* notice and comment, and (2) distributions including binaries display
* the following acknowledgement: ``This product includes software
* developed by the University of California, Berkeley and its contributors''
* in the documentation or other materials provided with the distribution
* and in all advertising materials mentioning features or use of this
* software. Neither the name of the University nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1985, 1987, 1988 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)date.c 4.27 (Berkeley) 5/31/90";
#endif /* not lint */
/*
* Date - print and set date
*/
#include <sys/param.h>
#include <sys/time.h>
#include <sys/file.h>
#include <errno.h>
#include <syslog.h>
#include <utmp.h>
#include <tzfile.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#define ATOI2(ar) (ar[0] - '0') * 10 + (ar[1] - '0'); ar += 2;
static struct timeval tv;
static int retval;
static int dmsize[] =
{ -1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
main(argc, argv)
int argc;
char **argv;
{
extern int optind;
extern char *optarg;
struct timezone tz;
char *ap, *tzn;
int ch, uflag, nflag;
char *username, *getlogin();
time_t time();
nflag = uflag = 0;
tz.tz_dsttime = tz.tz_minuteswest = 0;
while ((ch = getopt(argc, argv, "d:nut:")) != EOF)
switch((char)ch) {
case 'd': /* daylight savings time */
tz.tz_dsttime = atoi(optarg) ? 1 : 0;
break;
case 'n': /* don't set network */
nflag = 1;
break;
case 'u': /* do it in GMT */
uflag = 1;
break;
case 't': /* minutes west of GMT */
/* error check; we can't allow "PST" */
if (isdigit(*optarg)) {
tz.tz_minuteswest = atoi(optarg);
break;
}
/*FALLTHROUGH*/
default:
usage();
exit(1);
}
argc -= optind;
argv += optind;
if (argc > 1) {
usage();
exit(1);
}
if ((tz.tz_minuteswest || tz.tz_dsttime) &&
settimeofday((struct timeval *)NULL, &tz)) {
perror("date: settimeofday");
exit(1);
}
if (gettimeofday(&tv, &tz)) {
perror("date: gettimeofday");
exit(1);
}
if (!argc)
goto display;
if (gtime(*argv)) {
usage();
exit(1);
}
if (!uflag) { /* convert to GMT assuming local time */
tv.tv_sec += (long)tz.tz_minuteswest * SECSPERMIN;
/* now fix up local daylight time */
if (localtime((time_t *)&tv.tv_sec)->tm_isdst)
tv.tv_sec -= SECSPERHOUR;
}
if (nflag || !netsettime(tv)) {
logwtmp("|", "date", "");
if (settimeofday(&tv, (struct timezone *)NULL)) {
perror("date: settimeofday");
exit(1);
}
logwtmp("{", "date", "");
}
username = getlogin();
if (!username || *username == '\0') /* single-user or no tty */
username = "root";
syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", username);
display:
if (gettimeofday(&tv, (struct timezone *)NULL)) {
perror("date: gettimeofday");
exit(1);
}
if (uflag) {
ap = asctime(gmtime((time_t *)&tv.tv_sec));
tzn = "GMT";
}
else {
struct tm *tp;
tp = localtime((time_t *)&tv.tv_sec);
ap = asctime(tp);
tzn = tp->tm_zone;
}
printf("%.20s%s%s", ap, tzn, ap + 19);
exit(retval);
}
/*
* gtime --
* convert user's time into number of seconds
*/
static
gtime(ap)
register char *ap;
{
register int year, month;
register char *C;
struct tm *L;
int day, hour, mins, secs;
for (secs = 0, C = ap; *C; ++C) {
if (*C == '.') { /* seconds provided */
if (strlen(C) != 3)
return(1);
*C = NULL;
secs = (C[1] - '0') * 10 + (C[2] - '0');
break;
}
if (!isdigit(*C))
return(-1);
}
L = localtime((time_t *)&tv.tv_sec);
year = L->tm_year; /* defaults */
month = L->tm_mon + 1;
day = L->tm_mday;
switch ((int)(C - ap)) { /* length */
case 10: /* yymmddhhmm */
year = ATOI2(ap);
case 8: /* mmddhhmm */
month = ATOI2(ap);
case 6: /* ddhhmm */
day = ATOI2(ap);
case 4: /* hhmm */
hour = ATOI2(ap);
mins = ATOI2(ap);
break;
default:
return(1);
}
if (*ap || month < 1 || month > 12 || day < 1 || day > 31 ||
hour < 0 || hour > 23 || mins < 0 || mins > 59 ||
secs < 0 || secs > 59)
return(1);
tv.tv_sec = 0;
year += TM_YEAR_BASE;
if (isleap(year) && month > 2)
++tv.tv_sec;
for (--year;year >= EPOCH_YEAR;--year)
tv.tv_sec += isleap(year) ? DAYSPERLYEAR : DAYSPERNYEAR;
while (--month)
tv.tv_sec += dmsize[month];
tv.tv_sec += day - 1;
tv.tv_sec = HOURSPERDAY * tv.tv_sec + hour;
tv.tv_sec = MINSPERHOUR * tv.tv_sec + mins;
tv.tv_sec = SECSPERMIN * tv.tv_sec + secs;
return(0);
}
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#define TSPTYPES
#include <protocols/timed.h>
#define WAITACK 2 /* seconds */
#define WAITDATEACK 5 /* seconds */
extern int errno;
/*
* Set the date in the machines controlled by timedaemons
* by communicating the new date to the local timedaemon.
* If the timedaemon is in the master state, it performs the
* correction on all slaves. If it is in the slave state, it
* notifies the master that a correction is needed.
* Returns 1 on success, 0 on failure.
*/
netsettime(ntv)
struct timeval ntv;
{
int s, length, port, timed_ack, found, err;
long waittime;
fd_set ready;
char hostname[MAXHOSTNAMELEN];
struct timeval tout;
struct servent *sp;
struct tsp msg;
struct sockaddr_in sin, dest, from;
sp = getservbyname("timed", "udp");
if (sp == 0) {
fputs("udp/timed: unknown service\n", stderr);
retval = 2;
return (0);
}
dest.sin_port = sp->s_port;
dest.sin_family = AF_INET;
dest.sin_addr.s_addr = htonl((u_long)INADDR_ANY);
s = socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0) {
if (errno != EPROTONOSUPPORT)
perror("date: socket");
goto bad;
}
bzero((char *)&sin, sizeof (sin));
sin.sin_family = AF_INET;
for (port = IPPORT_RESERVED - 1; port > IPPORT_RESERVED / 2; port--) {
sin.sin_port = htons((u_short)port);
if (bind(s, (struct sockaddr *)&sin, sizeof (sin)) >= 0)
break;
if (errno != EADDRINUSE) {
if (errno != EADDRNOTAVAIL)
perror("date: bind");
goto bad;
}
}
if (port == IPPORT_RESERVED / 2) {
fputs("date: All ports in use\n", stderr);
goto bad;
}
msg.tsp_type = TSP_SETDATE;
msg.tsp_vers = TSPVERSION;
if (gethostname(hostname, sizeof (hostname))) {
perror("date: gethostname");
goto bad;
}
(void) strncpy(msg.tsp_name, hostname, sizeof (hostname));
msg.tsp_seq = htons((u_short)0);
msg.tsp_time.tv_sec = htonl((u_long)ntv.tv_sec);
msg.tsp_time.tv_usec = htonl((u_long)ntv.tv_usec);
length = sizeof (struct sockaddr_in);
if (connect(s, &dest, length) < 0) {
perror("date: connect");
goto bad;
}
if (send(s, (char *)&msg, sizeof (struct tsp), 0) < 0) {
if (errno != ECONNREFUSED)
perror("date: send");
goto bad;
}
timed_ack = -1;
waittime = WAITACK;
loop:
tout.tv_sec = waittime;
tout.tv_usec = 0;
FD_ZERO(&ready);
FD_SET(s, &ready);
found = select(FD_SETSIZE, &ready, (fd_set *)0, (fd_set *)0, &tout);
length = sizeof(err);
if (getsockopt(s, SOL_SOCKET, SO_ERROR, (char *)&err, &length) == 0
&& err) {
errno = err;
if (errno != ECONNREFUSED)
perror("date: send (delayed error)");
goto bad;
}
if (found > 0 && FD_ISSET(s, &ready)) {
length = sizeof (struct sockaddr_in);
if (recvfrom(s, (char *)&msg, sizeof (struct tsp), 0, &from,
&length) < 0) {
if (errno != ECONNREFUSED)
perror("date: recvfrom");
goto bad;
}
msg.tsp_seq = ntohs(msg.tsp_seq);
msg.tsp_time.tv_sec = ntohl(msg.tsp_time.tv_sec);
msg.tsp_time.tv_usec = ntohl(msg.tsp_time.tv_usec);
switch (msg.tsp_type) {
case TSP_ACK:
timed_ack = TSP_ACK;
waittime = WAITDATEACK;
goto loop;
case TSP_DATEACK:
(void)close(s);
return (1);
default:
fprintf(stderr,
"date: Wrong ack received from timed: %s\n",
tsptype[msg.tsp_type]);
timed_ack = -1;
break;
}
}
if (timed_ack == -1)
fputs("date: Can't reach time daemon, time set locally.\n",
stderr);
bad:
(void)close(s);
retval = 2;
return (0);
}
usage()
{
fputs("usage: date [-nu] [-d dst] [-t minutes_west] [yymmddhhmm[.ss]]\n", stderr);
}