diff options
Diffstat (limited to 'usr.sbin/rdate/rdate.c')
| -rw-r--r-- | usr.sbin/rdate/rdate.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/usr.sbin/rdate/rdate.c b/usr.sbin/rdate/rdate.c new file mode 100644 index 00000000000..f1adbe1ebdf --- /dev/null +++ b/usr.sbin/rdate/rdate.c @@ -0,0 +1,141 @@ +/* + * Copyright (c) 1994 Christos Zoulas + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by Christos Zoulas. + * 4. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * $Id: rdate.c,v 1.1 1995/10/18 08:48:04 deraadt Exp $ + */ + +/* + * rdate.c: Set the date from the specified host + * + * Uses the rfc868 time protocol at socket 37. + * Time is returned as the number of seconds since + * midnight January 1st 1900. + */ +#ifndef lint +static char rcsid[] = "$Id: rdate.c,v 1.1 1995/10/18 08:48:04 deraadt Exp $"; +#endif /* lint */ + +#include <sys/types.h> +#include <sys/param.h> +#include <stdio.h> +#include <ctype.h> +#include <string.h> +#include <sys/time.h> +#include <sys/socket.h> +#include <netdb.h> +#include <netinet/in.h> + +/* seconds from midnight Jan 1900 - 1970 */ +#if __STDC__ +#define DIFFERENCE 2208988800UL +#else +#define DIFFERENCE 2208988800 +#endif + +int +main(argc, argv) + int argc; + char *argv[]; +{ + int pr = 0, silent = 0, s; + time_t tim; + char *hname; + struct hostent *hp; + struct protoent *pp, ppp; + struct servent *sp, ssp; + struct sockaddr_in sa; + extern char *__progname; + extern int optind; + int c; + + while ((c = getopt(argc, argv, "ps")) != -1) + switch (c) { + case 'p': + pr++; + break; + + case 's': + silent++; + break; + + default: + goto usage; + } + + if (argc - 1 != optind) { +usage: + (void) fprintf(stderr, "Usage: %s [-ps] host\n", __progname); + return (1); + } + hname = argv[optind]; + + if ((hp = gethostbyname(hname)) == NULL) { + fprintf(stderr, "%s: ", __progname); + herror(hname); + exit(1); + } + + if ((sp = getservbyname("time", "tcp")) == NULL) { + sp = &ssp; + sp->s_port = 37; + sp->s_proto = "tcp"; + } + if ((pp = getprotobyname(sp->s_proto)) == NULL) { + pp = &ppp; + pp->p_proto = 6; + } + if ((s = socket(AF_INET, SOCK_STREAM, pp->p_proto)) == -1) + err(1, "Could not create socket"); + + bzero(&sa, sizeof sa); + sa.sin_family = AF_INET; + sa.sin_port = sp->s_port; + + memcpy(&(sa.sin_addr.s_addr), hp->h_addr, hp->h_length); + + if (connect(s, (struct sockaddr *) & sa, sizeof(sa)) == -1) + err(1, "Could not connect socket"); + + if (read(s, &tim, sizeof(time_t)) != sizeof(time_t)) + err(1, "Could not read data"); + + (void) close(s); + tim = ntohl(tim) - DIFFERENCE; + + if (!pr) { + struct timeval tv; + tv.tv_sec = tim; + tv.tv_usec = 0; + if (settimeofday(&tv, NULL) == -1) + err(1, "Could not set time of day"); + } + if (!silent) + (void) fputs(ctime(&tim), stdout); + return 0; +} |