/* $NetBSD: cmds.c,v 1.23 2007/02/04 21:17:01 cbiere Exp $ */
/*-
* 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.
* 3. 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.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)cmds.c 8.2 (Berkeley) 3/26/95";
#else
__RCSID("$NetBSD: cmds.c,v 1.23 2007/02/04 21:17:01 cbiere Exp $");
#endif
#endif /* not lint */
#include "timedc.h"
#include <sys/file.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <err.h>
#define TSPTYPES
#include <protocols/timed.h>
#define SECHR (60*60)
#define SECDAY (24*SECHR)
int sock_raw; /* used by measure() */
static int sock;
extern int measure_delta;
void bytenetorder(struct tsp *);
void bytehostorder(struct tsp *);
void set_tsp_name(struct tsp *, const char *);
void get_tsp_name(const struct tsp *, char *, size_t);
#define BU 2208988800UL /* seconds before UNIX epoch */
enum { CACHED, REFRESH };
static const char *
myname(int refresh)
{
static char name[MAXHOSTNAMELEN + 1];
static int initialized;
if (refresh || !initialized) {
initialized = 1;
(void)gethostname(name, sizeof(name));
name[sizeof(name) - 1] = '\0';
}
return name;
}
static in_port_t
udpservport(const char *service)
{
const struct servent *srvp;
srvp = getservbyname(service, "udp");
if (srvp == NULL) {
warnx("%s/udp: unknown service", service);
return 0;
}
return srvp->s_port;
}
static const char *
getaddr(const char *name, struct sockaddr_in *addr, in_port_t port)
{
const struct hostent *hp;
hp = gethostbyname(name);
if (hp == NULL) {
warnx("Error resolving %s (%s)", name, hstrerror(h_errno));
return NULL;
}
if (addr) {
memset(addr, 0, sizeof(*addr));
addr->sin_family = AF_INET;
addr->sin_port = port;
memcpy(&addr->sin_addr.s_addr, hp->h_addr, sizeof(in_addr_t));
}
return hp->h_name ? hp->h_name : name;
}
static const char *
tsp_type_to_string(const struct tsp *msg)
{
unsigned i;
i = msg->tsp_type;
return i < TSPTYPENUMBER ? tsptype[i] : "unknown";
}
/* compute the difference between our date and another machine
*/
static int /* difference in days from our time */
daydiff(const char *hostname, const struct sockaddr_in *addr)
{
struct pollfd set[1];
int trials;
if (connect(sock, (const struct sockaddr *)addr,
sizeof(*addr)) == -1) {
warn("connect");
return 0;
}
set[0].fd = sock;
set[0].events = POLLIN;
for (trials = 0; trials < 10; trials++) {
ssize_t ret;
uint32_t sec;
/* ask for the time */
sec = 0;
ret = send(sock, &sec, sizeof(sec), 0);
if (ret < (ssize_t)sizeof(sec)) {
if (ret < 0)
warn("send(sock)");
else
warnx("send(sock): incomplete");
return 0;
}
for (;;) {
int i;
/* wait 2 seconds between 10 tries */
i = poll(set, 1, 2000);
if (i < 0) {
if (errno == EINTR)
continue;
warn("poll(date read)");
return 0;
}
if (0 == i)
break;
ret = recv(sock, &sec, sizeof(sec), 0);
if (ret < (ssize_t)sizeof(sec)) {
if (ret < 0)
warn("recv(date read)");
else
warnx("recv(date read): incomplete");
return 0;
}
sec = ntohl(sec);
if (sec < BU) {
warnx("%s says it is before 1970: %lu",
hostname, (unsigned long)sec);
return 0;
} else {
struct timeval now;
sec -= BU;
(void)gettimeofday(&now, NULL);
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(int argc, char *argv[])
{
extern int measure(u_long, u_long, const char *,
const struct sockaddr_in*, int);
in_port_t port;
if (argc < 2) {
printf("Usage: clockdiff host ... \n");
return;
}
(void)myname(REFRESH);
/* get the address for the date ready */
port = udpservport("time");
while (argc > 1) {
struct sockaddr_in server;
const char *hostname;
int measure_status;
int avg_cnt;
long avg;
argc--; argv++;
if ((hostname = getaddr(*argv, &server, port)) == NULL)
continue;
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", hostname);
continue;
case NONSTDTIME:
printf("%s transmits a non-standard time format\n",
hostname);
continue;
case UNREACHABLE:
printf("%s is unreachable\n", hostname);
continue;
}
/*
* Try to get the date only after using ICMP timestamps to
* get the time. This is because the date protocol
* is optional.
*/
if (port != 0) {
avg = daydiff(*argv, &server);
if (avg > SECDAY) {
printf("time on %s is %ld days ahead %s\n",
hostname, avg/SECDAY, myname(CACHED));
continue;
} else if (avg < -SECDAY) {
printf("time on %s is %ld days behind %s\n",
hostname, -avg/SECDAY, myname(CACHED));
continue;
}
}
if (measure_delta > 0) {
printf("time on %s is %d ms. ahead of time on %s\n",
hostname, measure_delta, myname(CACHED));
} else if (measure_delta == 0) {
printf("%s and %s have the same time\n",
hostname, myname(CACHED));
} else {
printf("time on %s is %d ms. behind time on %s\n",
hostname, -measure_delta, myname(CACHED));
}
}
return;
}
/*
* finds location of master timedaemon
*/
void
msite(int argc, char *argv[])
{
struct pollfd set[1];
in_port_t port;
int i;
if (argc < 1) {
printf("Usage: msite [hostname]\n");
return;
}
port = udpservport("timed");
if (port == 0)
return;
(void)myname(REFRESH);
i = 1;
set[0].fd = sock;
set[0].events = POLLIN;
do {
struct sockaddr_in dest;
struct tsp msg;
const char *tgtname;
tgtname = (i >= argc) ? myname(CACHED) : argv[i];
if (getaddr(tgtname, &dest, port) == NULL)
continue;
if (connect(sock, (const struct sockaddr *)&dest,
sizeof(dest)) == -1) {
warn("connect");
continue;
}
set_tsp_name(&msg, myname(CACHED));
msg.tsp_type = TSP_MSITE;
msg.tsp_vers = TSPVERSION;
bytenetorder(&msg);
if (send(sock, &msg, sizeof(msg), 0) < 0) {
warn("send");
continue;
}
if (poll(set, 1, 15000)) {
ssize_t ret;
ret = recv(sock, &msg, sizeof(msg), 0);
if (ret < (ssize_t)sizeof(msg)) {
if (ret < 0)
warn("recv");
else
warnx("recv: incomplete");
continue;
}
bytehostorder(&msg);
if (msg.tsp_type == TSP_ACK) {
char name[MAXHOSTNAMELEN];
get_tsp_name(&msg, name, sizeof(name));
printf("master timedaemon at %s is %s\n",
tgtname, name);
} else {
printf("received wrong ack: %s\n",
tsp_type_to_string(&msg));
}
} else {
printf("communication error with %s\n", tgtname);
}
} while (++i < argc);
}
/*
* quits timedc
*/
void
quit(int argc, char *argv[])
{
(void) argc;
(void) argv;
exit(EXIT_SUCCESS);
}
/*
* 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(int argc, char *argv[])
{
in_port_t port;
if (argc < 2) {
printf("Usage: election host1 [host2 ...]\n");
return;
}
port = udpservport("timed");
if (port == 0)
return;
while (argc > 1) {
struct sockaddr_in addr;
struct tsp msg;
argc--; argv++;
if (getaddr(*argv, &addr, port) == NULL)
continue;
msg.tsp_type = TSP_TEST;
msg.tsp_vers = TSPVERSION;
set_tsp_name(&msg, myname(CACHED));
bytenetorder(&msg);
if (sendto(sock, &msg, sizeof(msg), 0,
(const struct sockaddr*)&addr, sizeof(addr)) < 0) {
warn("send");
}
}
}
/*
* Enables or disables tracing on local timedaemon
*/
void
tracing(int argc, char *argv[])
{
struct pollfd set[1];
struct sockaddr_in dest;
in_port_t port;
struct tsp msg;
int onflag;
if (argc != 2) {
printf("Usage: tracing { on | off }\n");
return;
}
port = udpservport("timed");
if (port == 0)
return;
if (getaddr(myname(REFRESH), &dest, port) == NULL)
return;
if (connect(sock, (const struct sockaddr *)&dest,
sizeof(dest)) == -1) {
warn("connect");
return;
}
if (strcmp(argv[1], "on") == 0) {
msg.tsp_type = TSP_TRACEON;
onflag = ON;
} else {
msg.tsp_type = TSP_TRACEOFF;
onflag = OFF;
}
set_tsp_name(&msg, myname(CACHED));
msg.tsp_vers = TSPVERSION;
bytenetorder(&msg);
if (send(sock, &msg, sizeof(msg), 0) < 0) {
warn("send");
return;
}
set[0].fd = sock;
set[0].events = POLLIN;
if (poll(set, 1, 5000)) {
ssize_t ret;
ret = recv(sock, &msg, sizeof(msg), 0);
if (ret < (ssize_t)sizeof(msg)) {
if (ret < 0)
warn("recv");
else
warnx("recv: incomplete");
return;
}
bytehostorder(&msg);
if (msg.tsp_type == TSP_ACK)
printf("timed tracing %s\n",
onflag ? "enabled" : "disabled");
else
printf("wrong ack received: %s\n",
tsp_type_to_string(&msg));
} else
printf("communication error\n");
}
int
priv_resources(void)
{
if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
warn("Cannot open UDP socket");
return -1;
}
if ((sock_raw = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP)) == -1) {
warn("Cannot open raw socket");
(void)close(sock);
return -1;
}
return 1;
}
