/bin/date/netdate.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 183 lines · 131 code · 17 blank · 35 comment · 30 complexity · 987d73f539466bc6636b93c8ac390cb1 MD5 · raw file
- /*-
- * Copyright (c) 1990, 1993
- * The Regents of the University of California. 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.
- * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
- */
- #if 0
- #ifndef lint
- static char sccsid[] = "@(#)netdate.c 8.1 (Berkeley) 5/31/93";
- #endif /* not lint */
- #endif
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- #include <sys/param.h>
- #include <sys/time.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <netdb.h>
- #define TSPTYPES
- #include <protocols/timed.h>
- #include <err.h>
- #include <errno.h>
- #include <string.h>
- #include <unistd.h>
- #include "extern.h"
- #define WAITACK 2 /* seconds */
- #define WAITDATEACK 5 /* seconds */
- extern int retval;
- /*
- * 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 0 on success. Returns > 0 on failure, setting retval to 2;
- */
- int
- netsettime(time_t tval)
- {
- struct timeval tout;
- struct servent *sp;
- struct tsp msg;
- struct sockaddr_in lsin, dest, from;
- fd_set ready;
- long waittime;
- int s, port, timed_ack, found, lerr;
- socklen_t length;
- char hostname[MAXHOSTNAMELEN];
- if ((sp = getservbyname("timed", "udp")) == NULL) {
- warnx("timed/udp: unknown service");
- return (retval = 2);
- }
- 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)
- warn("timed");
- return (retval = 2);
- }
- memset(&lsin, 0, sizeof(lsin));
- lsin.sin_family = AF_INET;
- for (port = IPPORT_RESERVED - 1; port > IPPORT_RESERVED / 2; port--) {
- lsin.sin_port = htons((u_short)port);
- if (bind(s, (struct sockaddr *)&lsin, sizeof(lsin)) >= 0)
- break;
- if (errno == EADDRINUSE)
- continue;
- if (errno != EADDRNOTAVAIL)
- warn("bind");
- goto bad;
- }
- if (port == IPPORT_RESERVED / 2) {
- warnx("all ports in use");
- goto bad;
- }
- memset(&msg, 0, sizeof(msg));
- msg.tsp_type = TSP_SETDATE;
- msg.tsp_vers = TSPVERSION;
- if (gethostname(hostname, sizeof(hostname))) {
- warn("gethostname");
- goto bad;
- }
- (void)strlcpy(msg.tsp_name, hostname, sizeof(msg.tsp_name));
- msg.tsp_seq = htons((u_short)0);
- msg.tsp_time.tv_sec = htonl((u_long)tval);
- msg.tsp_time.tv_usec = htonl((u_long)0);
- length = sizeof(struct sockaddr_in);
- if (connect(s, (struct sockaddr *)&dest, length) < 0) {
- warn("connect");
- goto bad;
- }
- if (send(s, (char *)&msg, sizeof(struct tsp), 0) < 0) {
- if (errno != ECONNREFUSED)
- warn("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(lerr);
- if (!getsockopt(s,
- SOL_SOCKET, SO_ERROR, (char *)&lerr, &length) && lerr) {
- if (lerr != ECONNREFUSED)
- warnc(lerr, "send (delayed error)");
- goto bad;
- }
- if (found > 0 && FD_ISSET(s, &ready)) {
- length = sizeof(struct sockaddr_in);
- if (recvfrom(s, &msg, sizeof(struct tsp), 0,
- (struct sockaddr *)&from, &length) < 0) {
- if (errno != ECONNREFUSED)
- warn("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 (0);
- default:
- warnx("wrong ack received from timed: %s",
- tsptype[msg.tsp_type]);
- timed_ack = -1;
- break;
- }
- }
- if (timed_ack == -1)
- warnx("can't reach time daemon, time set locally");
- bad:
- (void)close(s);
- return (retval = 2);
- }