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-rw-r--r--rdate.c116
1 files changed, 0 insertions, 116 deletions
diff --git a/rdate.c b/rdate.c
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1/* vi: set sw=4 ts=4: */
2/*
3 * The Rdate command will ask a time server for the RFC 868 time
4 * and optionally set the system time.
5 *
6 * by Sterling Huxley <sterling@europa.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22*/
23
24#include <sys/time.h>
25#include <sys/types.h>
26#include <sys/socket.h>
27#include <netinet/in.h>
28#include <netdb.h>
29#include <stdio.h>
30#include <getopt.h>
31#include <string.h>
32#include <time.h>
33#include <stdlib.h>
34#include <unistd.h>
35#include "busybox.h"
36
37
38static const int RFC_868_BIAS = 2208988800UL;
39
40static time_t askremotedate(const char *host)
41{
42 struct hostent *h;
43 struct sockaddr_in s_in;
44 struct servent *tserv;
45 unsigned long int nett, localt;
46 int fd;
47
48 h = xgethostbyname(host); /* get the IP addr */
49 memcpy(&s_in.sin_addr, h->h_addr, sizeof(s_in.sin_addr));
50
51 s_in.sin_port = htons(37); /* find port # */
52 if ((tserv = getservbyname("time", "tcp")) != NULL)
53 s_in.sin_port = tserv->s_port;
54
55 s_in.sin_family = AF_INET;
56
57 if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) /* get net connection */
58 perror_msg_and_die("socket");
59
60 if (connect(fd, (struct sockaddr *)&s_in, sizeof(s_in)) < 0) /* connect to time server */
61 perror_msg_and_die("%s", host);
62
63 if (read(fd, (void *)&nett, 4) != 4) /* read time from server */
64 error_msg_and_die("%s did not send the complete time", host);
65
66 close(fd);
67
68 /* convert from network byte order to local byte order.
69 * RFC 868 time is the number of seconds
70 * since 00:00 (midnight) 1 January 1900 GMT
71 * the RFC 868 time 2,208,988,800 corresponds to 00:00 1 Jan 1970 GMT
72 * Subtract the RFC 868 time to get Linux epoch
73 */
74 localt= ntohl(nett) - RFC_868_BIAS;
75
76 return(localt);
77}
78
79int rdate_main(int argc, char **argv)
80{
81 time_t remote_time;
82 int opt;
83 int setdate = 1;
84 int printdate = 1;
85
86 /* Interpret command line args */
87 while ((opt = getopt(argc, argv, "sp")) > 0) {
88 switch (opt) {
89 case 's':
90 printdate = 0;
91 setdate = 1;
92 break;
93 case 'p':
94 printdate = 1;
95 setdate = 0;
96 break;
97 default:
98 show_usage();
99 }
100 }
101
102 if (optind == argc)
103 show_usage();
104
105 remote_time = askremotedate(argv[optind]);
106
107 if (setdate) {
108 if (stime(&remote_time) < 0)
109 perror_msg_and_die("Could not set time of day");
110 }
111
112 if (printdate)
113 printf("%s", ctime(&remote_time));
114
115 return EXIT_SUCCESS;
116}