| Current Path : /usr/src/usr.sbin/timed/timedc/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/usr.sbin/timed/timedc/cmds.c |
/*-
* Copyright (c) 1985, 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[] = "@(#)cmds.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/usr.sbin/timed/timedc/cmds.c 229247 2012-01-01 23:49:11Z dim $");
#include "timedc.h"
#include <sys/file.h>
#include <arpa/inet.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <err.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define TSPTYPES
#include <protocols/timed.h>
#define SECHR (60*60)
#define SECDAY (24*SECHR)
# define DATE_PROTO "udp"
# define DATE_PORT "time"
int sock;
int sock_raw;
char myname[MAXHOSTNAMELEN];
struct hostent *hp;
struct sockaddr_in server;
struct sockaddr_in dayaddr;
extern int measure_delta;
void bytenetorder(struct tsp *);
void bytehostorder(struct tsp *);
#define BU (2208988800UL) /* seconds before UNIX epoch */
/* compute the difference between our date and another machine
*/
static int /* difference in days from our time */
daydiff(hostname)
char *hostname;
{
int i;
int trials;
struct timeval tout, now;
fd_set ready;
struct sockaddr from;
int fromlen;
unsigned long sec;
/* wait 2 seconds between 10 tries */
tout.tv_sec = 2;
tout.tv_usec = 0;
for (trials = 0; trials < 10; trials++) {
/* ask for the time */
sec = 0;
if (sendto(sock, &sec, sizeof(sec), 0,
(struct sockaddr*)&dayaddr, sizeof(dayaddr)) < 0) {
warn("sendto(sock)");
return 0;
}
for (;;) {
FD_ZERO(&ready);
FD_SET(sock, &ready);
i = select(sock+1, &ready, (fd_set *)0,
(fd_set *)0, &tout);
if (i < 0) {
if (errno == EINTR)
continue;
warn("select(date read)");
return 0;
}
if (0 == i)
break;
fromlen = sizeof(from);
if (recvfrom(sock,&sec,sizeof(sec),0,
&from,&fromlen) < 0) {
warn("recvfrom(date read)");
return 0;
}
sec = ntohl(sec);
if (sec < BU) {
warnx("%s says it is before 1970: %lu",
hostname, sec);
return 0;
}
sec -= BU;
(void)gettimeofday(&now, (struct timezone*)0);
return (sec - now.tv_sec);
}
}
/* if we get here, we tried too many times */
warnx("%s will not tell us the date", hostname);
return 0;
}
/*
* Clockdiff computes the difference between the time of the machine on
* which it is called and the time of the machines given as argument.
* The time differences measured by clockdiff are obtained using a sequence
* of ICMP TSTAMP messages which are returned to the sender by the IP module
* in the remote machine.
* In order to compare clocks of machines in different time zones, the time
* is transmitted (as a 32-bit value) in milliseconds since midnight UT.
* If a hosts uses a different time format, it should set the high order
* bit of the 32-bit quantity it transmits.
* However, VMS apparently transmits the time in milliseconds since midnight
* local time (rather than GMT) without setting the high order bit.
* Furthermore, it does not understand daylight-saving time. This makes
* clockdiff behaving inconsistently with hosts running VMS.
*
* In order to reduce the sensitivity to the variance of message transmission
* time, clockdiff sends a sequence of messages. Yet, measures between
* two `distant' hosts can be affected by a small error. The error can,
* however, be reduced by increasing the number of messages sent in each
* measurement.
*/
void
clockdiff(argc, argv)
int argc;
char *argv[];
{
int measure_status;
extern int measure(u_long, u_long, char *, struct sockaddr_in*, int);
register int avg_cnt;
register long avg;
struct servent *sp;
if (argc < 2) {
printf("usage: timedc clockdiff host ...\n");
return;
}
if (gethostname(myname, sizeof(myname) - 1) < 0)
err(1, "gethostname");
/* get the address for the date ready */
sp = getservbyname(DATE_PORT, DATE_PROTO);
if (!sp) {
warnx("%s/%s: unknown service", DATE_PORT, DATE_PROTO);
dayaddr.sin_port = 0;
} else {
dayaddr.sin_port = sp->s_port;
}
while (argc > 1) {
argc--; argv++;
hp = gethostbyname(*argv);
if (hp == NULL) {
warnx("%s: %s", *argv, hstrerror(h_errno));
continue;
}
server.sin_family = hp->h_addrtype;
bcopy(hp->h_addr, &server.sin_addr.s_addr, hp->h_length);
for (avg_cnt = 0, avg = 0; avg_cnt < 16; avg_cnt++) {
measure_status = measure(10000,100, *argv, &server, 1);
if (measure_status != GOOD)
break;
avg += measure_delta;
}
if (measure_status == GOOD)
measure_delta = avg/avg_cnt;
switch (measure_status) {
case HOSTDOWN:
printf("%s is down\n", hp->h_name);
continue;
case NONSTDTIME:
printf("%s transmits a non-standard time format\n",
hp->h_name);
continue;
case UNREACHABLE:
printf("%s is unreachable\n", hp->h_name);
continue;
}
/*
* Try to get the date only after using ICMP timestamps to
* get the time. This is because the date protocol
* is optional.
*/
if (dayaddr.sin_port != 0) {
dayaddr.sin_family = hp->h_addrtype;
bcopy(hp->h_addr, &dayaddr.sin_addr.s_addr,
hp->h_length);
avg = daydiff(*argv);
if (avg > SECDAY) {
printf("time on %s is %ld days ahead %s\n",
hp->h_name, avg/SECDAY, myname);
continue;
} else if (avg < -SECDAY) {
printf("time on %s is %ld days behind %s\n",
hp->h_name, -avg/SECDAY, myname);
continue;
}
}
if (measure_delta > 0) {
printf("time on %s is %d ms. ahead of time on %s\n",
hp->h_name, measure_delta, myname);
} else if (measure_delta == 0) {
printf("%s and %s have the same time\n",
hp->h_name, myname);
} else {
printf("time on %s is %d ms. behind time on %s\n",
hp->h_name, -measure_delta, myname);
}
}
return;
}
/*
* finds location of master timedaemon
*/
void
msite(argc, argv)
int argc;
char *argv[];
{
ssize_t cc;
fd_set ready;
struct sockaddr_in dest;
int i, length;
struct sockaddr_in from;
struct timeval tout;
struct tsp msg;
struct servent *srvp;
char *tgtname;
if (argc < 1) {
printf("usage: timedc msite [host ...]\n");
return;
}
srvp = getservbyname("timed", "udp");
if (srvp == 0) {
warnx("timed/udp: unknown service");
return;
}
dest.sin_port = srvp->s_port;
dest.sin_family = AF_INET;
if (gethostname(myname, sizeof(myname) - 1) < 0)
err(1, "gethostname");
i = 1;
do {
tgtname = (i >= argc) ? myname : argv[i];
hp = gethostbyname(tgtname);
if (hp == 0) {
warnx("%s: %s", tgtname, hstrerror(h_errno));
continue;
}
bcopy(hp->h_addr, &dest.sin_addr.s_addr, hp->h_length);
(void)strlcpy(msg.tsp_name, myname, sizeof(msg.tsp_name));
msg.tsp_type = TSP_MSITE;
msg.tsp_vers = TSPVERSION;
bytenetorder(&msg);
if (sendto(sock, &msg, sizeof(struct tsp), 0,
(struct sockaddr*)&dest,
sizeof(struct sockaddr)) < 0) {
warn("sendto");
continue;
}
tout.tv_sec = 15;
tout.tv_usec = 0;
FD_ZERO(&ready);
FD_SET(sock, &ready);
if (select(FD_SETSIZE, &ready, (fd_set *)0, (fd_set *)0,
&tout)) {
length = sizeof(from);
cc = recvfrom(sock, &msg, sizeof(struct tsp), 0,
(struct sockaddr *)&from, &length);
if (cc < 0) {
warn("recvfrom");
continue;
}
/*
* The 4.3BSD protocol spec had a 32-byte tsp_name field, and
* this is still OS-dependent. Demand that the packet is at
* least long enough to hold a 4.3BSD packet.
*/
if (cc < (sizeof(struct tsp) - MAXHOSTNAMELEN + 32)) {
fprintf(stderr,
"short packet (%zd/%zu bytes) from %s\n",
cc, sizeof(struct tsp) - MAXHOSTNAMELEN + 32,
inet_ntoa(from.sin_addr));
continue;
}
bytehostorder(&msg);
if (msg.tsp_type == TSP_ACK) {
printf("master timedaemon at %s is %s\n",
tgtname, msg.tsp_name);
} else {
if (msg.tsp_type >= TSPTYPENUMBER)
printf("unknown ack received: %u\n",
msg.tsp_type);
else
printf("wrong ack received: %s\n",
tsptype[msg.tsp_type]);
}
} else {
printf("communication error with %s\n", tgtname);
}
} while (++i < argc);
}
/*
* quits timedc
*/
void
quit()
{
exit(0);
}
/*
* Causes the election timer to expire on the selected hosts
* It sends just one udp message per machine, relying on
* reliability of communication channel.
*/
void
testing(argc, argv)
int argc;
char *argv[];
{
struct servent *srvp;
struct sockaddr_in sin;
struct tsp msg;
if (argc < 2) {
printf("usage: timedc election host1 [host2 ...]\n");
return;
}
srvp = getservbyname("timed", "udp");
if (srvp == 0) {
warnx("timed/udp: unknown service");
return;
}
while (argc > 1) {
argc--; argv++;
hp = gethostbyname(*argv);
if (hp == NULL) {
warnx("%s: %s", *argv, hstrerror(h_errno));
argc--; argv++;
continue;
}
sin.sin_port = srvp->s_port;
sin.sin_family = hp->h_addrtype;
bcopy(hp->h_addr, &sin.sin_addr.s_addr, hp->h_length);
msg.tsp_type = TSP_TEST;
msg.tsp_vers = TSPVERSION;
if (gethostname(myname, sizeof(myname) - 1) < 0)
err(1, "gethostname");
(void)strlcpy(msg.tsp_name, myname, sizeof(msg.tsp_name));
bytenetorder(&msg);
if (sendto(sock, &msg, sizeof(struct tsp), 0,
(struct sockaddr*)&sin,
sizeof(struct sockaddr)) < 0) {
warn("sendto");
}
}
}
/*
* Enables or disables tracing on local timedaemon
*/
void
tracing(argc, argv)
int argc;
char *argv[];
{
int onflag;
int length;
ssize_t cc;
fd_set ready;
struct sockaddr_in dest;
struct sockaddr_in from;
struct timeval tout;
struct tsp msg;
struct servent *srvp;
if (argc != 2) {
printf("usage: timedc trace { on | off }\n");
return;
}
srvp = getservbyname("timed", "udp");
if (srvp == 0) {
warnx("timed/udp: unknown service");
return;
}
dest.sin_port = srvp->s_port;
dest.sin_family = AF_INET;
if (gethostname(myname, sizeof(myname) - 1) < 0)
err(1, "gethostname");
hp = gethostbyname(myname);
bcopy(hp->h_addr, &dest.sin_addr.s_addr, hp->h_length);
if (strcmp(argv[1], "on") == 0) {
msg.tsp_type = TSP_TRACEON;
onflag = ON;
} else {
msg.tsp_type = TSP_TRACEOFF;
onflag = OFF;
}
(void)strcpy(msg.tsp_name, myname);
msg.tsp_vers = TSPVERSION;
bytenetorder(&msg);
if (sendto(sock, &msg, sizeof(struct tsp), 0,
(struct sockaddr*)&dest, sizeof(struct sockaddr)) < 0) {
warn("sendto");
return;
}
tout.tv_sec = 5;
tout.tv_usec = 0;
FD_ZERO(&ready);
FD_SET(sock, &ready);
if (select(FD_SETSIZE, &ready, (fd_set *)0, (fd_set *)0, &tout)) {
length = sizeof(from);
cc = recvfrom(sock, &msg, sizeof(struct tsp), 0,
(struct sockaddr *)&from, &length);
if (cc < 0) {
warn("recvfrom");
return;
}
/*
* The 4.3BSD protocol spec had a 32-byte tsp_name field, and
* this is still OS-dependent. Demand that the packet is at
* least long enough to hold a 4.3BSD packet.
*/
if (cc < (sizeof(struct tsp) - MAXHOSTNAMELEN + 32)) {
fprintf(stderr, "short packet (%zd/%zu bytes) from %s\n",
cc, sizeof(struct tsp) - MAXHOSTNAMELEN + 32,
inet_ntoa(from.sin_addr));
return;
}
bytehostorder(&msg);
if (msg.tsp_type == TSP_ACK)
if (onflag)
printf("timed tracing enabled\n");
else
printf("timed tracing disabled\n");
else {
if (msg.tsp_type >= TSPTYPENUMBER)
printf("unknown ack received: %u\n",
msg.tsp_type);
else
printf("wrong ack received: %s\n",
tsptype[msg.tsp_type]);
}
} else
printf("communication error\n");
}
int
priv_resources()
{
int port;
struct sockaddr_in sin;
sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock < 0) {
warn("opening socket");
return(-1);
}
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = 0;
for (port = IPPORT_RESERVED - 1; port > IPPORT_RESERVED / 2; port--) {
sin.sin_port = htons((u_short)port);
if (bind(sock, (struct sockaddr*)&sin, sizeof (sin)) >= 0)
break;
if (errno != EADDRINUSE && errno != EADDRNOTAVAIL) {
warn("bind");
(void) close(sock);
return(-1);
}
}
if (port == IPPORT_RESERVED / 2) {
warnx("all reserved ports in use");
(void) close(sock);
return(-1);
}
sock_raw = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
if (sock_raw < 0) {
warn("opening raw socket");
(void) close(sock);
return(-1);
}
return(1);
}