mirror of
https://github.com/sheumann/hush.git
synced 2024-12-27 01:32:08 +00:00
136 lines
3.3 KiB
C
136 lines
3.3 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* The Rdate command will ask a time server for the RFC 868 time
|
|
* and optionally set the system time.
|
|
*
|
|
* by Sterling Huxley <sterling@europa.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
|
|
#include "busybox.h"
|
|
#define BB_DECLARE_EXTERN
|
|
#include "messages.c"
|
|
#include <sys/time.h>
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <netinet/in.h>
|
|
#include <netdb.h>
|
|
#include <stdio.h>
|
|
#include <getopt.h>
|
|
|
|
|
|
#define RFC_868_BIAS 2208988800UL
|
|
|
|
int setdate= 0;
|
|
int printdate= 0;
|
|
|
|
time_t askremotedate(char *host)
|
|
{
|
|
struct hostent *h;
|
|
struct sockaddr_in sin;
|
|
struct servent *tserv;
|
|
unsigned long int nett, localt;
|
|
int fd;
|
|
|
|
if (!(h = gethostbyname(host))) { /* get the IP addr */
|
|
errorMsg("%s: %s\n", host, strerror(errno));
|
|
return(-1);
|
|
}
|
|
if ((tserv = getservbyname("time", "tcp")) == NULL) { /* find port # */
|
|
errorMsg("%s: %s\n", "time", strerror(errno));
|
|
return(-1);
|
|
}
|
|
if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) { /* get net connection */
|
|
errorMsg("%s: %s\n", "socket", strerror(errno));
|
|
return(-1);
|
|
}
|
|
|
|
memcpy(&sin.sin_addr, h->h_addr, sizeof(sin.sin_addr));
|
|
sin.sin_port= tserv->s_port;
|
|
sin.sin_family = AF_INET;
|
|
|
|
if (connect(fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) { /* connect to time server */
|
|
errorMsg("%s: %s\n", host, strerror(errno));
|
|
close(fd);
|
|
return(-1);
|
|
}
|
|
if (read(fd, &nett, 4) != 4) { /* read time from server */
|
|
close(fd);
|
|
errorMsg("%s did not send the complete time\n", host);
|
|
}
|
|
close(fd);
|
|
|
|
/* convert from network byte order to local byte order.
|
|
* RFC 868 time is the number of seconds
|
|
* since 00:00 (midnight) 1 January 1900 GMT
|
|
* the RFC 868 time 2,208,988,800 corresponds to 00:00 1 Jan 1970 GMT
|
|
* Subtract the RFC 868 time to get Linux epoch
|
|
*/
|
|
localt= ntohl(nett) - RFC_868_BIAS;
|
|
|
|
return(localt);
|
|
}
|
|
|
|
int rdate_main(int argc, char **argv)
|
|
{
|
|
time_t time;
|
|
int opt;
|
|
|
|
/* Interpret command line args */
|
|
/* do special-case option parsing */
|
|
if (argv[1] && (strcmp(argv[1], "--help") == 0))
|
|
usage(rdate_usage);
|
|
|
|
/* do normal option parsing */
|
|
while ((opt = getopt(argc, argv, "Hsp")) > 0) {
|
|
switch (opt) {
|
|
default:
|
|
case 'H':
|
|
usage(rdate_usage);
|
|
return(FALSE);
|
|
break;
|
|
case 's':
|
|
setdate++;
|
|
break;
|
|
case 'p':
|
|
printdate++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* the default action is to set the date */
|
|
if (printdate==0 && setdate==0) setdate++;
|
|
|
|
if (optind == argc) {
|
|
usage(rdate_usage);
|
|
return(FALSE);
|
|
}
|
|
|
|
if ((time= askremotedate(argv[optind])) == (time_t)-1) {
|
|
return(FALSE);
|
|
}
|
|
if (setdate) {
|
|
if (stime(&time) < 0)
|
|
fatalError("Could not set time of day: %s\n", strerror(errno));
|
|
}
|
|
if (printdate) {
|
|
fprintf(stdout, "%s", ctime(&time));
|
|
}
|
|
|
|
return(TRUE);
|
|
}
|