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4bf240e3b9
appending UL.
527 lines
13 KiB
C
527 lines
13 KiB
C
/*-
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* Copyright (c) 1985, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)cmds.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#ifdef sgi
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#ident "$Revision: 1.10 $"
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#endif
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#include "timedc.h"
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#include <sys/file.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_icmp.h>
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#include <stdlib.h>
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#include <strings.h>
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#include <unistd.h>
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#define TSPTYPES
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#include <protocols/timed.h>
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#ifdef sgi
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#include <bstring.h>
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#include <sys/clock.h>
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#else
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#define SECHR (60*60)
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#define SECDAY (24*SECHR)
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#endif /* sgi */
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# define DATE_PROTO "udp"
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# define DATE_PORT "time"
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int sock;
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int sock_raw;
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char myname[MAXHOSTNAMELEN];
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struct hostent *hp;
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struct sockaddr_in server;
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struct sockaddr_in dayaddr;
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extern int measure_delta;
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void bytenetorder(struct tsp *);
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void bytehostorder(struct tsp *);
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#define BU (2208988800UL) /* seconds before UNIX epoch */
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/* compute the difference between our date and another machine
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*/
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static int /* difference in days from our time */
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daydiff(hostname)
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char *hostname;
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{
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int i;
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int trials;
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struct timeval tout, now;
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fd_set ready;
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struct sockaddr from;
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int fromlen;
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unsigned long sec;
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/* wait 2 seconds between 10 tries */
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tout.tv_sec = 2;
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tout.tv_usec = 0;
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for (trials = 0; trials < 10; trials++) {
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/* ask for the time */
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sec = 0;
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if (sendto(sock, &sec, sizeof(sec), 0,
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(struct sockaddr*)&dayaddr, sizeof(dayaddr)) < 0) {
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perror("sendto(sock)");
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return 0;
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}
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for (;;) {
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FD_ZERO(&ready);
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FD_SET(sock, &ready);
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i = select(sock+1, &ready, (fd_set *)0,
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(fd_set *)0, &tout);
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if (i < 0) {
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if (errno = EINTR)
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continue;
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perror("select(date read)");
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return 0;
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}
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if (0 == i)
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break;
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fromlen = sizeof(from);
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if (recvfrom(sock,&sec,sizeof(sec),0,
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&from,&fromlen) < 0) {
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perror("recvfrom(date read)");
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return 0;
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}
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sec = ntohl(sec);
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if (sec < BU) {
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fprintf(stderr,
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"%s says it is before 1970: %lu",
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hostname, sec);
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return 0;
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}
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sec -= BU;
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(void)gettimeofday(&now, (struct timezone*)0);
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return (sec - now.tv_sec);
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}
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}
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/* if we get here, we tried too many times */
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fprintf(stderr,"%s will not tell us the date\n", hostname);
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return 0;
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}
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/*
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* Clockdiff computes the difference between the time of the machine on
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* which it is called and the time of the machines given as argument.
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* The time differences measured by clockdiff are obtained using a sequence
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* of ICMP TSTAMP messages which are returned to the sender by the IP module
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* in the remote machine.
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* In order to compare clocks of machines in different time zones, the time
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* is transmitted (as a 32-bit value) in milliseconds since midnight UT.
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* If a hosts uses a different time format, it should set the high order
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* bit of the 32-bit quantity it transmits.
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* However, VMS apparently transmits the time in milliseconds since midnight
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* local time (rather than GMT) without setting the high order bit.
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* Furthermore, it does not understand daylight-saving time. This makes
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* clockdiff behaving inconsistently with hosts running VMS.
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*
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* In order to reduce the sensitivity to the variance of message transmission
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* time, clockdiff sends a sequence of messages. Yet, measures between
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* two `distant' hosts can be affected by a small error. The error can,
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* however, be reduced by increasing the number of messages sent in each
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* measurement.
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*/
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void
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clockdiff(argc, argv)
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int argc;
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char *argv[];
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{
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int measure_status;
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extern int measure(u_long, u_long, char *, struct sockaddr_in*, int);
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register int avg_cnt;
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register long avg;
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struct servent *sp;
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if (argc < 2) {
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printf("Usage: clockdiff host ... \n");
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return;
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}
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(void)gethostname(myname,sizeof(myname));
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/* get the address for the date ready */
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sp = getservbyname(DATE_PORT, DATE_PROTO);
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if (!sp) {
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(void)fprintf(stderr, "%s/%s is an unknown service\n",
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DATE_PORT, DATE_PROTO);
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dayaddr.sin_port = 0;
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} else {
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dayaddr.sin_port = sp->s_port;
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}
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while (argc > 1) {
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argc--; argv++;
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hp = gethostbyname(*argv);
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if (hp == NULL) {
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fprintf(stderr, "timedc: %s: ", *argv);
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herror(0);
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continue;
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}
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server.sin_family = hp->h_addrtype;
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bcopy(hp->h_addr, &server.sin_addr.s_addr, hp->h_length);
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for (avg_cnt = 0, avg = 0; avg_cnt < 16; avg_cnt++) {
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measure_status = measure(10000,100, *argv, &server, 1);
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if (measure_status != GOOD)
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break;
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avg += measure_delta;
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}
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if (measure_status == GOOD)
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measure_delta = avg/avg_cnt;
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switch (measure_status) {
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case HOSTDOWN:
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printf("%s is down\n", hp->h_name);
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continue;
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case NONSTDTIME:
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printf("%s transmitts a non-standard time format\n",
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hp->h_name);
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continue;
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case UNREACHABLE:
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printf("%s is unreachable\n", hp->h_name);
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continue;
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}
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/*
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* Try to get the date only after using ICMP timestamps to
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* get the time. This is because the date protocol
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* is optional.
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*/
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if (dayaddr.sin_port != 0) {
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dayaddr.sin_family = hp->h_addrtype;
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bcopy(hp->h_addr, &dayaddr.sin_addr.s_addr,
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hp->h_length);
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avg = daydiff(*argv);
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if (avg > SECDAY) {
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printf("time on %s is %ld days ahead %s\n",
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hp->h_name, avg/SECDAY, myname);
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continue;
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} else if (avg < -SECDAY) {
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printf("time on %s is %ld days behind %s\n",
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hp->h_name, -avg/SECDAY, myname);
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continue;
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}
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}
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if (measure_delta > 0) {
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printf("time on %s is %d ms. ahead of time on %s\n",
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hp->h_name, measure_delta, myname);
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} else if (measure_delta == 0) {
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printf("%s and %s have the same time\n",
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hp->h_name, myname);
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} else {
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printf("time on %s is %d ms. behind time on %s\n",
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hp->h_name, -measure_delta, myname);
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}
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}
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return;
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}
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/*
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* finds location of master timedaemon
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*/
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void
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msite(argc, argv)
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int argc;
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char *argv[];
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{
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int cc;
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fd_set ready;
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struct sockaddr_in dest;
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int i, length;
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struct sockaddr from;
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struct timeval tout;
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struct tsp msg;
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struct servent *srvp;
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char *tgtname;
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if (argc < 1) {
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printf("Usage: msite [hostname]\n");
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return;
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}
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srvp = getservbyname("timed", "udp");
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if (srvp == 0) {
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fprintf(stderr, "udp/timed: unknown service\n");
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return;
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}
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dest.sin_port = srvp->s_port;
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dest.sin_family = AF_INET;
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(void)gethostname(myname, sizeof(myname));
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i = 1;
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do {
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tgtname = (i >= argc) ? myname : argv[i];
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hp = gethostbyname(tgtname);
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if (hp == 0) {
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fprintf(stderr, "timedc: %s: ", tgtname);
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herror(0);
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continue;
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}
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bcopy(hp->h_addr, &dest.sin_addr.s_addr, hp->h_length);
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(void)strcpy(msg.tsp_name, myname);
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msg.tsp_type = TSP_MSITE;
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msg.tsp_vers = TSPVERSION;
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bytenetorder(&msg);
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if (sendto(sock, &msg, sizeof(struct tsp), 0,
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(struct sockaddr*)&dest,
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sizeof(struct sockaddr)) < 0) {
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perror("sendto");
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continue;
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}
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tout.tv_sec = 15;
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tout.tv_usec = 0;
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FD_ZERO(&ready);
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FD_SET(sock, &ready);
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if (select(FD_SETSIZE, &ready, (fd_set *)0, (fd_set *)0,
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&tout)) {
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length = sizeof(struct sockaddr);
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cc = recvfrom(sock, &msg, sizeof(struct tsp), 0,
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&from, &length);
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if (cc < 0) {
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perror("recvfrom");
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continue;
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}
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bytehostorder(&msg);
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if (msg.tsp_type == TSP_ACK) {
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printf("master timedaemon at %s is %s\n",
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tgtname, msg.tsp_name);
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} else {
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printf("received wrong ack: %s\n",
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tsptype[msg.tsp_type]);
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}
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} else {
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printf("communication error with %s\n", tgtname);
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}
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} while (++i < argc);
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}
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/*
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* quits timedc
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*/
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void
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quit()
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{
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exit(0);
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}
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/*
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* Causes the election timer to expire on the selected hosts
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* It sends just one udp message per machine, relying on
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* reliability of communication channel.
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*/
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void
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testing(argc, argv)
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int argc;
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char *argv[];
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{
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struct servent *srvp;
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struct sockaddr_in sin;
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struct tsp msg;
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if (argc < 2) {
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printf("Usage: election host1 [host2 ...]\n");
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return;
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}
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srvp = getservbyname("timed", "udp");
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if (srvp == 0) {
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fprintf(stderr, "udp/timed: unknown service\n");
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return;
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}
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while (argc > 1) {
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argc--; argv++;
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hp = gethostbyname(*argv);
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if (hp == NULL) {
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fprintf(stderr, "timedc: %s: ", *argv);
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herror(0);
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argc--; argv++;
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continue;
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}
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sin.sin_port = srvp->s_port;
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sin.sin_family = hp->h_addrtype;
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bcopy(hp->h_addr, &sin.sin_addr.s_addr, hp->h_length);
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msg.tsp_type = TSP_TEST;
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msg.tsp_vers = TSPVERSION;
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(void)gethostname(myname, sizeof(myname));
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(void)strncpy(msg.tsp_name, myname, sizeof(msg.tsp_name));
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bytenetorder(&msg);
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if (sendto(sock, &msg, sizeof(struct tsp), 0,
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(struct sockaddr*)&sin,
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sizeof(struct sockaddr)) < 0) {
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perror("sendto");
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}
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}
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}
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/*
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* Enables or disables tracing on local timedaemon
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*/
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void
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tracing(argc, argv)
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int argc;
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char *argv[];
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{
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int onflag;
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int length;
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int cc;
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fd_set ready;
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struct sockaddr_in dest;
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struct sockaddr from;
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struct timeval tout;
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struct tsp msg;
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struct servent *srvp;
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if (argc != 2) {
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printf("Usage: tracing { on | off }\n");
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return;
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}
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srvp = getservbyname("timed", "udp");
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if (srvp == 0) {
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fprintf(stderr, "udp/timed: unknown service\n");
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return;
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}
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dest.sin_port = srvp->s_port;
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dest.sin_family = AF_INET;
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(void)gethostname(myname,sizeof(myname));
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hp = gethostbyname(myname);
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bcopy(hp->h_addr, &dest.sin_addr.s_addr, hp->h_length);
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if (strcmp(argv[1], "on") == 0) {
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msg.tsp_type = TSP_TRACEON;
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onflag = ON;
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} else {
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msg.tsp_type = TSP_TRACEOFF;
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onflag = OFF;
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}
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(void)strcpy(msg.tsp_name, myname);
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msg.tsp_vers = TSPVERSION;
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bytenetorder(&msg);
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if (sendto(sock, &msg, sizeof(struct tsp), 0,
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(struct sockaddr*)&dest, sizeof(struct sockaddr)) < 0) {
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perror("sendto");
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return;
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}
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tout.tv_sec = 5;
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tout.tv_usec = 0;
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FD_ZERO(&ready);
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FD_SET(sock, &ready);
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if (select(FD_SETSIZE, &ready, (fd_set *)0, (fd_set *)0, &tout)) {
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length = sizeof(struct sockaddr);
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cc = recvfrom(sock, &msg, sizeof(struct tsp), 0,
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&from, &length);
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if (cc < 0) {
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perror("recvfrom");
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return;
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}
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bytehostorder(&msg);
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if (msg.tsp_type == TSP_ACK)
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if (onflag)
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printf("timed tracing enabled\n");
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else
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printf("timed tracing disabled\n");
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else
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printf("wrong ack received: %s\n",
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tsptype[msg.tsp_type]);
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} else
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printf("communication error\n");
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}
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int
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priv_resources()
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{
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int port;
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struct sockaddr_in sin;
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sock = socket(AF_INET, SOCK_DGRAM, 0);
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if (sock < 0) {
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perror("opening socket");
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return(-1);
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}
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = 0;
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for (port = IPPORT_RESERVED - 1; port > IPPORT_RESERVED / 2; port--) {
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sin.sin_port = htons((u_short)port);
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if (bind(sock, (struct sockaddr*)&sin, sizeof (sin)) >= 0)
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break;
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if (errno != EADDRINUSE && errno != EADDRNOTAVAIL) {
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perror("bind");
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(void) close(sock);
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return(-1);
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}
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}
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if (port == IPPORT_RESERVED / 2) {
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fprintf(stderr, "all reserved ports in use\n");
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(void) close(sock);
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return(-1);
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}
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sock_raw = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
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if (sock_raw < 0) {
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perror("opening raw socket");
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(void) close(sock);
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return(-1);
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}
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return(1);
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}
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