[apple/shell_cmds.git] / date / netdate.c

/*-
 * 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: src/bin/date/netdate.c,v 1.18 2004/04/06 20:06:45 markm Exp $");

#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;
	}
	msg.tsp_type = TSP_SETDATE;
	msg.tsp_vers = TSPVERSION;
	if (gethostname(hostname, sizeof(hostname))) {
		warn("gethostname");
		goto bad;
	}
	(void)strncpy(msg.tsp_name, hostname, sizeof(msg.tsp_name) - 1);
	msg.tsp_name[sizeof(msg.tsp_name) - 1] = '\0';
	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);
}
Commit	Line	Data
44bd5ea7 A	1	/*-
	2	* Copyright (c) 1990, 1993
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
44bd5ea7 A	13	* 4. Neither the name of the University nor the names of its contributors
	14	* may be used to endorse or promote products derived from this software
	15	* without specific prior written permission.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	20	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	21	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	27	* SUCH DAMAGE.
	28	*/
	29
44bd5ea7	30	#if 0
e1a085ba A	31	#ifndef lint
e1a085ba A	32	static char sccsid[] = "@(#)netdate.c 8.1 (Berkeley) 5/31/93";
44bd5ea7	33	#endif /* not lint */
e1a085ba A	34	#endif
	35
	36	#include <sys/cdefs.h>
	37	__FBSDID("$FreeBSD: src/bin/date/netdate.c,v 1.18 2004/04/06 20:06:45 markm Exp $");
44bd5ea7 A	38
	39	#include <sys/param.h>
	40	#include <sys/time.h>
	41	#include <sys/socket.h>
	42
	43	#include <netinet/in.h>
	44	#include <netdb.h>
	45	#define TSPTYPES
	46	#include <protocols/timed.h>
	47
	48	#include <err.h>
	49	#include <errno.h>
44bd5ea7 A	50	#include <string.h>
	51	#include <unistd.h>
	52
	53	#include "extern.h"
	54
	55	#define WAITACK 2 /* seconds */
	56	#define WAITDATEACK 5 /* seconds */
	57
	58	extern int retval;
	59
	60	/*
	61	* Set the date in the machines controlled by timedaemons by communicating the
	62	* new date to the local timedaemon. If the timedaemon is in the master state,
	63	* it performs the correction on all slaves. If it is in the slave state, it
	64	* notifies the master that a correction is needed.
	65	* Returns 0 on success. Returns > 0 on failure, setting retval to 2;
	66	*/
	67	int
e1a085ba	68	netsettime(time_t tval)
44bd5ea7 A	69	{
	70	struct timeval tout;
	71	struct servent *sp;
	72	struct tsp msg;
e1a085ba	73	struct sockaddr_in lsin, dest, from;
44bd5ea7 A	74	fd_set ready;
44bd5ea7 A	75	long waittime;
e1a085ba A	76	int s, port, timed_ack, found, lerr;
	77	socklen_t length;
	78	char hostname[MAXHOSTNAMELEN];
44bd5ea7 A	79
44bd5ea7 A	80	if ((sp = getservbyname("timed", "udp")) == NULL) {
e1a085ba	81	warnx("timed/udp: unknown service");
44bd5ea7 A	82	return (retval = 2);
	83	}
	84
44bd5ea7	85	dest.sin_port = sp->s_port;
e1a085ba A	86	dest.sin_family = AF_INET;
e1a085ba A	87	dest.sin_addr.s_addr = htonl((u_long)INADDR_ANY);
44bd5ea7 A	88	s = socket(AF_INET, SOCK_DGRAM, 0);
	89	if (s < 0) {
	90	if (errno != EPROTONOSUPPORT)
	91	warn("timed");
	92	return (retval = 2);
	93	}
	94
e1a085ba A	95	memset(&lsin, 0, sizeof(lsin));
	96	lsin.sin_family = AF_INET;
	97	for (port = IPPORT_RESERVED - 1; port > IPPORT_RESERVED / 2; port--) {
	98	lsin.sin_port = htons((u_short)port);
	99	if (bind(s, (struct sockaddr *)&lsin, sizeof(lsin)) >= 0)
	100	break;
	101	if (errno == EADDRINUSE)
	102	continue;
	103	if (errno != EADDRNOTAVAIL)
	104	warn("bind");
44bd5ea7 A	105	goto bad;
44bd5ea7 A	106	}
e1a085ba A	107	if (port == IPPORT_RESERVED / 2) {
e1a085ba A	108	warnx("all ports in use");
44bd5ea7 A	109	goto bad;
44bd5ea7 A	110	}
44bd5ea7 A	111	msg.tsp_type = TSP_SETDATE;
	112	msg.tsp_vers = TSPVERSION;
	113	if (gethostname(hostname, sizeof(hostname))) {
	114	warn("gethostname");
	115	goto bad;
	116	}
e1a085ba A	117	(void)strncpy(msg.tsp_name, hostname, sizeof(msg.tsp_name) - 1);
e1a085ba A	118	msg.tsp_name[sizeof(msg.tsp_name) - 1] = '\0';
44bd5ea7 A	119	msg.tsp_seq = htons((u_short)0);
	120	msg.tsp_time.tv_sec = htonl((u_long)tval);
	121	msg.tsp_time.tv_usec = htonl((u_long)0);
	122	length = sizeof(struct sockaddr_in);
	123	if (connect(s, (struct sockaddr *)&dest, length) < 0) {
	124	warn("connect");
	125	goto bad;
	126	}
	127	if (send(s, (char *)&msg, sizeof(struct tsp), 0) < 0) {
	128	if (errno != ECONNREFUSED)
	129	warn("send");
	130	goto bad;
	131	}
	132
	133	timed_ack = -1;
	134	waittime = WAITACK;
	135	loop:
	136	tout.tv_sec = waittime;
	137	tout.tv_usec = 0;
	138
	139	FD_ZERO(&ready);
	140	FD_SET(s, &ready);
	141	found = select(FD_SETSIZE, &ready, (fd_set )0, (fd_set )0, &tout);
	142
e1a085ba	143	length = sizeof(lerr);
44bd5ea7	144	if (!getsockopt(s,
e1a085ba A	145	SOL_SOCKET, SO_ERROR, (char *)&lerr, &length) && lerr) {
	146	if (lerr != ECONNREFUSED)
	147	warnc(lerr, "send (delayed error)");
44bd5ea7 A	148	goto bad;
	149	}
	150
	151	if (found > 0 && FD_ISSET(s, &ready)) {
	152	length = sizeof(struct sockaddr_in);
	153	if (recvfrom(s, &msg, sizeof(struct tsp), 0,
	154	(struct sockaddr *)&from, &length) < 0) {
	155	if (errno != ECONNREFUSED)
	156	warn("recvfrom");
	157	goto bad;
	158	}
	159	msg.tsp_seq = ntohs(msg.tsp_seq);
	160	msg.tsp_time.tv_sec = ntohl(msg.tsp_time.tv_sec);
	161	msg.tsp_time.tv_usec = ntohl(msg.tsp_time.tv_usec);
	162	switch (msg.tsp_type) {
	163	case TSP_ACK:
	164	timed_ack = TSP_ACK;
	165	waittime = WAITDATEACK;
	166	goto loop;
	167	case TSP_DATEACK:
	168	(void)close(s);
	169	return (0);
	170	default:
e1a085ba	171	warnx("wrong ack received from timed: %s",
44bd5ea7 A	172	tsptype[msg.tsp_type]);
	173	timed_ack = -1;
	174	break;
	175	}
	176	}
	177	if (timed_ack == -1)
	178	warnx("can't reach time daemon, time set locally");
	179
	180	bad:
	181	(void)close(s);
	182	return (retval = 2);
	183	}