timed.c revision 30830
11553Srgrimes/*- 21553Srgrimes * Copyright (c) 1985, 1993 31553Srgrimes * The Regents of the University of California. All rights reserved. 41553Srgrimes * 51553Srgrimes * Redistribution and use in source and binary forms, with or without 61553Srgrimes * modification, are permitted provided that the following conditions 71553Srgrimes * are met: 81553Srgrimes * 1. Redistributions of source code must retain the above copyright 91553Srgrimes * notice, this list of conditions and the following disclaimer. 101553Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111553Srgrimes * notice, this list of conditions and the following disclaimer in the 121553Srgrimes * documentation and/or other materials provided with the distribution. 131553Srgrimes * 3. All advertising materials mentioning features or use of this software 141553Srgrimes * must display the following acknowledgement: 151553Srgrimes * This product includes software developed by the University of 161553Srgrimes * California, Berkeley and its contributors. 171553Srgrimes * 4. Neither the name of the University nor the names of its contributors 181553Srgrimes * may be used to endorse or promote products derived from this software 191553Srgrimes * without specific prior written permission. 201553Srgrimes * 211553Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221553Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231553Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241553Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251553Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261553Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271553Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281553Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291553Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301553Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311553Srgrimes * SUCH DAMAGE. 321553Srgrimes */ 331553Srgrimes 341553Srgrimes#ifndef lint 3530642Scharnierstatic const char copyright[] = 361553Srgrimes"@(#) Copyright (c) 1985, 1993\n\ 371553Srgrimes The Regents of the University of California. All rights reserved.\n"; 381553Srgrimes#endif /* not lint */ 391553Srgrimes 401553Srgrimes#ifndef lint 4130642Scharnier#if 0 421553Srgrimesstatic char sccsid[] = "@(#)timed.c 8.1 (Berkeley) 6/6/93"; 4330642Scharnier#endif 4430642Scharnierstatic const char rcsid[] = 4530830Scharnier "$Id: timed.c,v 1.5 1997/10/22 06:19:49 charnier Exp $"; 461553Srgrimes#endif /* not lint */ 471553Srgrimes 481553Srgrimes#define TSPTYPES 491553Srgrimes#include "globals.h" 501553Srgrimes#include <net/if.h> 511553Srgrimes#include <sys/file.h> 521553Srgrimes#include <sys/ioctl.h> 531553Srgrimes#include <setjmp.h> 541553Srgrimes#include "pathnames.h" 551553Srgrimes#include <math.h> 561553Srgrimes#include <sys/types.h> 571553Srgrimes#include <sys/times.h> 581553Srgrimes#ifdef sgi 591553Srgrimes#include <unistd.h> 601553Srgrimes#include <sys/syssgi.h> 611553Srgrimes#include <sys/schedctl.h> 621553Srgrimes#endif /* sgi */ 631553Srgrimes 641553Srgrimesint trace = 0; 651553Srgrimesint sock, sock_raw = -1; 661553Srgrimesint status = 0; 671553Srgrimesu_short sequence; /* sequence number */ 681553Srgrimeslong delay1; 691553Srgrimeslong delay2; 701553Srgrimes 711553Srgrimesint nslavenets; /* nets were I could be a slave */ 721553Srgrimesint nmasternets; /* nets were I could be a master */ 731553Srgrimesint nignorednets; /* ignored nets */ 741553Srgrimesint nnets; /* nets I am connected to */ 751553Srgrimes 761553SrgrimesFILE *fd; /* trace file FD */ 771553Srgrimes 781553Srgrimesjmp_buf jmpenv; 791553Srgrimes 801553Srgrimesstruct netinfo *nettab = 0; 811553Srgrimesstruct netinfo *slavenet; 821553Srgrimesint Mflag; 831553Srgrimesint justquit = 0; 841553Srgrimesint debug; 851553Srgrimes 861553Srgrimesstatic struct nets { 871553Srgrimes char *name; 881553Srgrimes long net; 891553Srgrimes struct nets *next; 901553Srgrimes} *nets = 0; 911553Srgrimes 921553Srgrimesstruct hosttbl hosttbl[NHOSTS+1]; /* known hosts */ 931553Srgrimes 941553Srgrimesstatic struct goodhost { /* hosts that we trust */ 951553Srgrimes char name[MAXHOSTNAMELEN+1]; 961553Srgrimes struct goodhost *next; 971553Srgrimes char perm; 981553Srgrimes} *goodhosts; 991553Srgrimes 1001553Srgrimesstatic char *goodgroup; /* net group of trusted hosts */ 1011553Srgrimesstatic void checkignorednets __P((void)); 1021553Srgrimesstatic void pickslavenet __P((struct netinfo *)); 1031553Srgrimesstatic void add_good_host __P((char *, int)); 1041553Srgrimes 1051553Srgrimes#ifdef sgi 1061553Srgrimeschar *timetrim_fn; 1071553Srgrimeschar *timetrim_wpat = "long timetrim = %ld;\ndouble tot_adj = %.0f;\ndouble tot_ticks = %.0f;\n/* timed version 2 */\n"; 1081553Srgrimeschar *timetrim_rpat = "long timetrim = %ld;\ndouble tot_adj = %lf;\ndouble tot_ticks = %lf;"; 1091553Srgrimeslong timetrim; 1101553Srgrimesdouble tot_adj, hr_adj; /* totals in nsec */ 1111553Srgrimesdouble tot_ticks, hr_ticks; 1121553Srgrimes 1131553Srgrimesint bufspace = 60*1024; 1141553Srgrimes#endif 1151553Srgrimes 11630642Scharnierstatic void usage __P((void)); 1171553Srgrimes 1181553Srgrimes/* 1191553Srgrimes * The timedaemons synchronize the clocks of hosts in a local area network. 1201553Srgrimes * One daemon runs as master, all the others as slaves. The master 1211553Srgrimes * performs the task of computing clock differences and sends correction 1221553Srgrimes * values to the slaves. 1231553Srgrimes * Slaves start an election to choose a new master when the latter disappears 1241553Srgrimes * because of a machine crash, network partition, or when killed. 1251553Srgrimes * A resolution protocol is used to kill all but one of the masters 1261553Srgrimes * that happen to exist in segments of a partitioned network when the 1271553Srgrimes * network partition is fixed. 1281553Srgrimes * 1291553Srgrimes * Authors: Riccardo Gusella & Stefano Zatti 1301553Srgrimes * 1311553Srgrimes * overhauled at Silicon Graphics 1321553Srgrimes */ 1331553Srgrimesint 1341553Srgrimesmain(argc, argv) 1351553Srgrimes int argc; 1361553Srgrimes char *argv[]; 1371553Srgrimes{ 1381553Srgrimes int on; 1391553Srgrimes int ret; 1401553Srgrimes int nflag, iflag; 1411553Srgrimes struct timeval ntime; 1421553Srgrimes struct servent *srvp; 1431553Srgrimes char buf[BUFSIZ], *cp, *cplim; 1441553Srgrimes struct ifconf ifc; 1451553Srgrimes struct ifreq ifreq, ifreqf, *ifr; 1461553Srgrimes register struct netinfo *ntp; 1471553Srgrimes struct netinfo *ntip; 1481553Srgrimes struct netinfo *savefromnet; 1491553Srgrimes struct netent *nentp; 1501553Srgrimes struct nets *nt; 1511553Srgrimes struct sockaddr_in server; 1521553Srgrimes u_short port; 1531553Srgrimes char c; 1541553Srgrimes#ifdef sgi 1551553Srgrimes FILE *timetrim_st; 1561553Srgrimes#endif 1571553Srgrimes 1581553Srgrimes#ifdef sgi 1591553Srgrimes struct tms tms; 1601553Srgrimes#endif /* sgi */ 1611553Srgrimes 1621553Srgrimes#ifdef lint 1631553Srgrimes ntip = NULL; 1641553Srgrimes#endif 1651553Srgrimes 1661553Srgrimes on = 1; 1671553Srgrimes nflag = OFF; 1681553Srgrimes iflag = OFF; 1691553Srgrimes 1701553Srgrimes#ifdef sgi 1711553Srgrimes if (0 > syssgi(SGI_GETTIMETRIM, &timetrim)) { 17230642Scharnier warn("syssgi(GETTIMETRIM)"); 1731553Srgrimes timetrim = 0; 1741553Srgrimes } 1751553Srgrimes tot_ticks = hr_ticks = times(&tms); 1761553Srgrimes#endif /* sgi */ 1771553Srgrimes 1781553Srgrimes opterr = 0; 17924428Simp while ((c = getopt(argc, argv, "Mtdn:i:F:G:P:")) != -1) { 1801553Srgrimes switch (c) { 1811553Srgrimes case 'M': 1821553Srgrimes Mflag = 1; 1831553Srgrimes break; 1841553Srgrimes 1851553Srgrimes case 't': 1861553Srgrimes trace = 1; 1871553Srgrimes break; 1881553Srgrimes 1891553Srgrimes case 'n': 1901553Srgrimes if (iflag) { 19130642Scharnier errx(1, "-i and -n make no sense together"); 1921553Srgrimes } else { 1931553Srgrimes nflag = ON; 1941553Srgrimes addnetname(optarg); 1951553Srgrimes } 1961553Srgrimes break; 1971553Srgrimes 1981553Srgrimes case 'i': 1991553Srgrimes if (nflag) { 20030642Scharnier errx(1, "-i and -n make no sense together"); 2011553Srgrimes } else { 2021553Srgrimes iflag = ON; 2031553Srgrimes addnetname(optarg); 2041553Srgrimes } 2051553Srgrimes break; 2061553Srgrimes 2071553Srgrimes case 'F': 2081553Srgrimes add_good_host(optarg,1); 2091553Srgrimes while (optind < argc && argv[optind][0] != '-') 2101553Srgrimes add_good_host(argv[optind++], 1); 2111553Srgrimes break; 2121553Srgrimes 2131553Srgrimes case 'd': 2141553Srgrimes debug = 1; 2151553Srgrimes break; 2161553Srgrimes case 'G': 21730642Scharnier if (goodgroup != 0) 21830642Scharnier errx(1, "only one net group"); 2191553Srgrimes goodgroup = optarg; 2201553Srgrimes break; 2211553Srgrimes#ifdef sgi 2221553Srgrimes case 'P': 2231553Srgrimes timetrim_fn = optarg; 2241553Srgrimes timetrim_st = fopen(timetrim_fn, "r+"); 2251553Srgrimes if (0 == timetrim_st) { 2261553Srgrimes if (errno != ENOENT) { 22730642Scharnier warn("%s", timetrim_fn); 2281553Srgrimes timetrim_fn = 0; 2291553Srgrimes } 2301553Srgrimes } else { 2311553Srgrimes int i; 2321553Srgrimes long trim; 2331553Srgrimes double adj, ticks; 2341553Srgrimes 2351553Srgrimes i = fscanf(timetrim_st, timetrim_rpat, 2361553Srgrimes &trim, &adj, &ticks); 2371553Srgrimes if (i < 1 2381553Srgrimes || trim > MAX_TRIM 2391553Srgrimes || trim < -MAX_TRIM 2401553Srgrimes || i == 2 2411553Srgrimes || (i == 3 2421553Srgrimes && trim != rint(adj*CLK_TCK/ticks))) { 2431553Srgrimes if (trace && i != EOF) 24430642Scharnier warn( 24530642Scharnier "unrecognized contents in %s", 2461553Srgrimes timetrim_fn); 2471553Srgrimes } else { 2481553Srgrimes if (0 > syssgi(SGI_SETTIMETRIM, 2491553Srgrimes trim)) { 25030642Scharnier warn("syssgi(SETTIMETRIM)"); 2511553Srgrimes } else { 2521553Srgrimes timetrim = trim; 2531553Srgrimes } 2541553Srgrimes if (i == 3) { 2551553Srgrimes tot_adj = adj; 2561553Srgrimes tot_ticks -= ticks; 2571553Srgrimes } 2581553Srgrimes } 2591553Srgrimes (void)fclose(timetrim_st); 2601553Srgrimes } 2611553Srgrimes break; 2621553Srgrimes#endif /* sgi */ 2631553Srgrimes 2641553Srgrimes default: 26530642Scharnier usage(); 2661553Srgrimes break; 2671553Srgrimes } 2681553Srgrimes } 26930642Scharnier if (optind < argc) 27030642Scharnier usage(); 2711553Srgrimes 2721553Srgrimes /* If we care about which machine is the master, then we must 2731553Srgrimes * be willing to be a master 2741553Srgrimes */ 2751553Srgrimes if (0 != goodgroup || 0 != goodhosts) 2761553Srgrimes Mflag = 1; 2771553Srgrimes 27830642Scharnier if (gethostname(hostname, sizeof(hostname) - 1) < 0) 27930642Scharnier err(1, "gethostname"); 2801553Srgrimes self.l_bak = &self; 2811553Srgrimes self.l_fwd = &self; 2821553Srgrimes self.h_bak = &self; 2831553Srgrimes self.h_fwd = &self; 2841553Srgrimes self.head = 1; 2851553Srgrimes self.good = 1; 2861553Srgrimes 2871553Srgrimes if (goodhosts != 0) /* trust ourself */ 2881553Srgrimes add_good_host(hostname,1); 2891553Srgrimes 2901553Srgrimes srvp = getservbyname("timed", "udp"); 29130642Scharnier if (srvp == 0) 29230642Scharnier errx(1, "unknown service 'timed/udp'"); 2931553Srgrimes port = srvp->s_port; 2948532Sdg bzero(&server, sizeof(struct sockaddr_in)); 2951553Srgrimes server.sin_port = srvp->s_port; 2961553Srgrimes server.sin_family = AF_INET; 2971553Srgrimes sock = socket(AF_INET, SOCK_DGRAM, 0); 29830642Scharnier if (sock < 0) 29930642Scharnier err(1, "socket"); 3001553Srgrimes if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&on, 30130642Scharnier sizeof(on)) < 0) 30230642Scharnier err(1, "setsockopt"); 3031553Srgrimes if (bind(sock, (struct sockaddr*)&server, sizeof(server))) { 3041553Srgrimes if (errno == EADDRINUSE) 30530642Scharnier warnx("time daemon already running"); 3061553Srgrimes else 30730642Scharnier warn("bind"); 3081553Srgrimes exit(1); 3091553Srgrimes } 3101553Srgrimes#ifdef sgi 3111553Srgrimes /* 3121553Srgrimes * handle many slaves with our buffer 3131553Srgrimes */ 3141553Srgrimes if (0 > setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (char*)&bufspace, 31530642Scharnier sizeof(bufspace))) 31630642Scharnier err(1, "setsockopt"); 3171553Srgrimes#endif /* sgi */ 3181553Srgrimes 3191553Srgrimes /* choose a unique seed for random number generation */ 3201553Srgrimes (void)gettimeofday(&ntime, 0); 3211553Srgrimes srandom(ntime.tv_sec + ntime.tv_usec); 3221553Srgrimes 3231553Srgrimes sequence = random(); /* initial seq number */ 3241553Srgrimes 3251553Srgrimes#ifndef sgi 3261553Srgrimes /* rounds kernel variable time to multiple of 5 ms. */ 3271553Srgrimes ntime.tv_sec = 0; 3281553Srgrimes ntime.tv_usec = -((ntime.tv_usec/1000) % 5) * 1000; 3291553Srgrimes (void)adjtime(&ntime, (struct timeval *)0); 3301553Srgrimes#endif /* sgi */ 3311553Srgrimes 3321553Srgrimes for (nt = nets; nt; nt = nt->next) { 3331553Srgrimes nentp = getnetbyname(nt->name); 3341553Srgrimes if (nentp == 0) { 3351553Srgrimes nt->net = inet_network(nt->name); 3361553Srgrimes if (nt->net != INADDR_NONE) 3371553Srgrimes nentp = getnetbyaddr(nt->net, AF_INET); 3381553Srgrimes } 3391553Srgrimes if (nentp != 0) { 3401553Srgrimes nt->net = nentp->n_net; 3411553Srgrimes } else if (nt->net == INADDR_NONE) { 34230642Scharnier errx(1, "unknown net %s", nt->name); 3431553Srgrimes } else if (nt->net == INADDR_ANY) { 34430642Scharnier errx(1, "bad net %s", nt->name); 3451553Srgrimes } else { 34630642Scharnier warnx("warning: %s unknown in /etc/networks", 3471553Srgrimes nt->name); 3481553Srgrimes } 3491553Srgrimes 3501553Srgrimes if (0 == (nt->net & 0xff000000)) 3511553Srgrimes nt->net <<= 8; 3521553Srgrimes if (0 == (nt->net & 0xff000000)) 3531553Srgrimes nt->net <<= 8; 3541553Srgrimes if (0 == (nt->net & 0xff000000)) 3551553Srgrimes nt->net <<= 8; 3561553Srgrimes } 3571553Srgrimes ifc.ifc_len = sizeof(buf); 3581553Srgrimes ifc.ifc_buf = buf; 35930642Scharnier if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) 36030642Scharnier err(1, "get interface configuration"); 3611553Srgrimes ntp = NULL; 3621553Srgrimes#ifdef sgi 3631553Srgrimes#define size(p) (sizeof(*ifr) - sizeof(ifr->ifr_name)) /* XXX hack. kludge */ 3641553Srgrimes#else 3651553Srgrimes#define size(p) max((p).sa_len, sizeof(p)) 3661553Srgrimes#endif 3671553Srgrimes cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */ 3681553Srgrimes for (cp = buf; cp < cplim; 3691553Srgrimes cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) { 3701553Srgrimes ifr = (struct ifreq *)cp; 3711553Srgrimes if (ifr->ifr_addr.sa_family != AF_INET) 3721553Srgrimes continue; 3731553Srgrimes if (!ntp) 3741553Srgrimes ntp = (struct netinfo*)malloc(sizeof(struct netinfo)); 3751553Srgrimes bzero(ntp,sizeof(*ntp)); 3761553Srgrimes ntp->my_addr=((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 3771553Srgrimes ntp->status = NOMASTER; 3781553Srgrimes ifreq = *ifr; 3791553Srgrimes ifreqf = *ifr; 3801553Srgrimes 3811553Srgrimes if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreqf) < 0) { 38230642Scharnier warn("get interface flags"); 3831553Srgrimes continue; 3841553Srgrimes } 3851553Srgrimes if ((ifreqf.ifr_flags & IFF_UP) == 0) 3861553Srgrimes continue; 3871553Srgrimes if ((ifreqf.ifr_flags & IFF_BROADCAST) == 0 && 3881553Srgrimes (ifreqf.ifr_flags & IFF_POINTOPOINT) == 0) { 3891553Srgrimes continue; 3901553Srgrimes } 3911553Srgrimes 3921553Srgrimes 3931553Srgrimes if (ioctl(sock, SIOCGIFNETMASK, (char *)&ifreq) < 0) { 39430642Scharnier warn("get netmask"); 3951553Srgrimes continue; 3961553Srgrimes } 3971553Srgrimes ntp->mask = ((struct sockaddr_in *) 3981553Srgrimes &ifreq.ifr_addr)->sin_addr.s_addr; 3991553Srgrimes 4001553Srgrimes if (ifreqf.ifr_flags & IFF_BROADCAST) { 4011553Srgrimes if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) { 40230642Scharnier warn("get broadaddr"); 4031553Srgrimes continue; 4041553Srgrimes } 4051553Srgrimes ntp->dest_addr = *(struct sockaddr_in *)&ifreq.ifr_broadaddr; 4061553Srgrimes /* What if the broadcast address is all ones? 4071553Srgrimes * So we cannot just mask ntp->dest_addr. */ 4081553Srgrimes ntp->net = ntp->my_addr; 4091553Srgrimes ntp->net.s_addr &= ntp->mask; 4101553Srgrimes } else { 4111553Srgrimes if (ioctl(sock, SIOCGIFDSTADDR, 4121553Srgrimes (char *)&ifreq) < 0) { 41330642Scharnier warn("get destaddr"); 4141553Srgrimes continue; 4151553Srgrimes } 4161553Srgrimes ntp->dest_addr = *(struct sockaddr_in *)&ifreq.ifr_dstaddr; 4171553Srgrimes ntp->net = ntp->dest_addr.sin_addr; 4181553Srgrimes } 4191553Srgrimes 4201553Srgrimes ntp->dest_addr.sin_port = port; 4211553Srgrimes 4221553Srgrimes for (nt = nets; nt; nt = nt->next) { 42328547Sjlemon if (ntp->net.s_addr == htonl(nt->net)) 4241553Srgrimes break; 4251553Srgrimes } 42630642Scharnier if ((nflag && !nt) || (iflag && nt)) 4271553Srgrimes continue; 4281553Srgrimes 4291553Srgrimes ntp->next = NULL; 4301553Srgrimes if (nettab == NULL) { 4311553Srgrimes nettab = ntp; 4321553Srgrimes } else { 4331553Srgrimes ntip->next = ntp; 4341553Srgrimes } 4351553Srgrimes ntip = ntp; 4361553Srgrimes ntp = NULL; 4371553Srgrimes } 4381553Srgrimes if (ntp) 4391553Srgrimes (void) free((char *)ntp); 44030642Scharnier if (nettab == NULL) 44130642Scharnier errx(1, "no network usable"); 4421553Srgrimes 4431553Srgrimes 4441553Srgrimes#ifdef sgi 4451553Srgrimes (void)schedctl(RENICE,0,10); /* run fast to get good time */ 4461553Srgrimes 4471553Srgrimes /* ticks to delay before responding to a broadcast */ 4481553Srgrimes delay1 = casual(0, CLK_TCK/10); 4491553Srgrimes#else 4501553Srgrimes 4511553Srgrimes /* microseconds to delay before responding to a broadcast */ 4521553Srgrimes delay1 = casual(1, 100*1000); 4531553Srgrimes#endif /* sgi */ 4541553Srgrimes 4551553Srgrimes /* election timer delay in secs. */ 4561553Srgrimes delay2 = casual(MINTOUT, MAXTOUT); 4571553Srgrimes 4581553Srgrimes 4591553Srgrimes#ifdef sgi 4601553Srgrimes (void)_daemonize(debug ? _DF_NOFORK|_DF_NOCHDIR : 0, sock, -1, -1); 4611553Srgrimes#else 4621553Srgrimes if (!debug) 4631553Srgrimes daemon(debug, 0); 4641553Srgrimes#endif /* sgi */ 4651553Srgrimes 4661553Srgrimes if (trace) 4671553Srgrimes traceon(); 4681553Srgrimes openlog("timed", LOG_CONS|LOG_PID, LOG_DAEMON); 4691553Srgrimes 4701553Srgrimes /* 4711553Srgrimes * keep returning here 4721553Srgrimes */ 4731553Srgrimes ret = setjmp(jmpenv); 4741553Srgrimes savefromnet = fromnet; 4751553Srgrimes setstatus(); 4761553Srgrimes 4771553Srgrimes if (Mflag) { 4781553Srgrimes switch (ret) { 4791553Srgrimes 4801553Srgrimes case 0: 4811553Srgrimes checkignorednets(); 4821553Srgrimes pickslavenet(0); 4831553Srgrimes break; 4841553Srgrimes case 1: 4851553Srgrimes /* Just lost our master */ 4861553Srgrimes if (slavenet != 0) 4871553Srgrimes slavenet->status = election(slavenet); 4881553Srgrimes if (!slavenet || slavenet->status == MASTER) { 4891553Srgrimes checkignorednets(); 4901553Srgrimes pickslavenet(0); 4911553Srgrimes } else { 4921553Srgrimes makeslave(slavenet); /* prune extras */ 4931553Srgrimes } 4941553Srgrimes break; 4951553Srgrimes 4961553Srgrimes case 2: 4971553Srgrimes /* Just been told to quit */ 4981553Srgrimes justquit = 1; 4991553Srgrimes pickslavenet(savefromnet); 5001553Srgrimes break; 5011553Srgrimes } 5021553Srgrimes 5031553Srgrimes setstatus(); 5041553Srgrimes if (!(status & MASTER) && sock_raw != -1) { 5051553Srgrimes /* sock_raw is not being used now */ 5061553Srgrimes (void)close(sock_raw); 5071553Srgrimes sock_raw = -1; 5081553Srgrimes } 5091553Srgrimes 5101553Srgrimes if (status == MASTER) 5111553Srgrimes master(); 5121553Srgrimes else 5131553Srgrimes slave(); 5141553Srgrimes 5151553Srgrimes } else { 5161553Srgrimes if (sock_raw != -1) { 5171553Srgrimes (void)close(sock_raw); 5181553Srgrimes sock_raw = -1; 5191553Srgrimes } 5201553Srgrimes 5211553Srgrimes if (ret) { 5221553Srgrimes /* we just lost our master or were told to quit */ 5231553Srgrimes justquit = 1; 5241553Srgrimes } 5251553Srgrimes for (ntp = nettab; ntp != NULL; ntp = ntp->next) { 5261553Srgrimes if (ntp->status == MASTER) 5271553Srgrimes rmnetmachs(ntp); 5281553Srgrimes ntp->status = NOMASTER; 5291553Srgrimes } 5301553Srgrimes checkignorednets(); 5311553Srgrimes pickslavenet(0); 5321553Srgrimes setstatus(); 5331553Srgrimes 5341553Srgrimes slave(); 5351553Srgrimes } 5361553Srgrimes /* NOTREACHED */ 5371553Srgrimes return(0); 5381553Srgrimes} 5391553Srgrimes 54030642Scharnierstatic void 54130642Scharnierusage() 54230642Scharnier{ 54330642Scharnier#ifdef sgi 54430642Scharnier fprintf(stderr, "%s\n%s\n", 54530642Scharnier"usage: timed [-dtM] [-i net|-n net] [-F host1 host2 ...]", 54630642Scharnier" [-G netgp] [-P trimfile]"); 54730642Scharnier#else 54830642Scharnier#ifdef HAVENIS 54930642Scharnier fprintf(stderr, 55030642Scharnier"usage: timed [-dtM] [-i net|-n net] [-F host1 host2 ...] [-G netgp]\n"); 55130642Scharnier#else 55230642Scharnier fprintf(stderr, 55330642Scharnier"usage: timed [-dtM] [-i net|-n net] [-F host1 host2 ...]\n"); 55430642Scharnier#endif /* HAVENIS */ 55530642Scharnier#endif /* sgi */ 55630642Scharnier exit(1); 55730642Scharnier} 55830642Scharnier 5591553Srgrimes/* 5601553Srgrimes * suppress an upstart, untrustworthy, self-appointed master 5611553Srgrimes */ 5621553Srgrimesvoid 5631553Srgrimessuppress(addr, name,net) 5641553Srgrimes struct sockaddr_in *addr; 5651553Srgrimes char *name; 5661553Srgrimes struct netinfo *net; 5671553Srgrimes{ 5681553Srgrimes struct sockaddr_in tgt; 5691553Srgrimes char tname[MAXHOSTNAMELEN]; 5701553Srgrimes struct tsp msg; 5711553Srgrimes static struct timeval wait; 5721553Srgrimes 5731553Srgrimes if (trace) 5741553Srgrimes fprintf(fd, "suppress: %s\n", name); 5751553Srgrimes tgt = *addr; 57630830Scharnier (void)strcpy(tname, name); 5771553Srgrimes 5781553Srgrimes while (0 != readmsg(TSP_ANY, ANYADDR, &wait, net)) { 5791553Srgrimes if (trace) 5801553Srgrimes fprintf(fd, "suppress:\tdiscarded packet from %s\n", 5811553Srgrimes name); 5821553Srgrimes } 5831553Srgrimes 5841553Srgrimes syslog(LOG_NOTICE, "suppressing false master %s", tname); 5851553Srgrimes msg.tsp_type = TSP_QUIT; 58630830Scharnier (void)strcpy(msg.tsp_name, hostname); 5871553Srgrimes (void)acksend(&msg, &tgt, tname, TSP_ACK, 0, 1); 5881553Srgrimes} 5891553Srgrimes 5901553Srgrimesvoid 5911553Srgrimeslookformaster(ntp) 5921553Srgrimes struct netinfo *ntp; 5931553Srgrimes{ 5941553Srgrimes struct tsp resp, conflict, *answer; 5951553Srgrimes struct timeval ntime; 5961553Srgrimes char mastername[MAXHOSTNAMELEN]; 5971553Srgrimes struct sockaddr_in masteraddr; 5981553Srgrimes 5991553Srgrimes get_goodgroup(0); 6001553Srgrimes ntp->status = SLAVE; 6011553Srgrimes 6021553Srgrimes /* look for master */ 6031553Srgrimes resp.tsp_type = TSP_MASTERREQ; 60430830Scharnier (void)strcpy(resp.tsp_name, hostname); 6051553Srgrimes answer = acksend(&resp, &ntp->dest_addr, ANYADDR, 6061553Srgrimes TSP_MASTERACK, ntp, 0); 6071553Srgrimes if (answer != 0 && !good_host_name(answer->tsp_name)) { 6081553Srgrimes suppress(&from, answer->tsp_name, ntp); 6091553Srgrimes ntp->status = NOMASTER; 6101553Srgrimes answer = 0; 6111553Srgrimes } 6121553Srgrimes if (answer == 0) { 6131553Srgrimes /* 6141553Srgrimes * Various conditions can cause conflict: races between 6151553Srgrimes * two just started timedaemons when no master is 6161553Srgrimes * present, or timedaemons started during an election. 6171553Srgrimes * A conservative approach is taken. Give up and became a 6181553Srgrimes * slave, postponing election of a master until first 6191553Srgrimes * timer expires. 6201553Srgrimes */ 6211553Srgrimes ntime.tv_sec = ntime.tv_usec = 0; 6221553Srgrimes answer = readmsg(TSP_MASTERREQ, ANYADDR, &ntime, ntp); 6231553Srgrimes if (answer != 0) { 6241553Srgrimes if (!good_host_name(answer->tsp_name)) { 6251553Srgrimes suppress(&from, answer->tsp_name, ntp); 6261553Srgrimes ntp->status = NOMASTER; 6271553Srgrimes } 6281553Srgrimes return; 6291553Srgrimes } 6301553Srgrimes 6311553Srgrimes ntime.tv_sec = ntime.tv_usec = 0; 6321553Srgrimes answer = readmsg(TSP_MASTERUP, ANYADDR, &ntime, ntp); 6331553Srgrimes if (answer != 0) { 6341553Srgrimes if (!good_host_name(answer->tsp_name)) { 6351553Srgrimes suppress(&from, answer->tsp_name, ntp); 6361553Srgrimes ntp->status = NOMASTER; 6371553Srgrimes } 6381553Srgrimes return; 6391553Srgrimes } 6401553Srgrimes 6411553Srgrimes ntime.tv_sec = ntime.tv_usec = 0; 6421553Srgrimes answer = readmsg(TSP_ELECTION, ANYADDR, &ntime, ntp); 6431553Srgrimes if (answer != 0) { 6441553Srgrimes if (!good_host_name(answer->tsp_name)) { 6451553Srgrimes suppress(&from, answer->tsp_name, ntp); 6461553Srgrimes ntp->status = NOMASTER; 6471553Srgrimes } 6481553Srgrimes return; 6491553Srgrimes } 6501553Srgrimes 6511553Srgrimes if (Mflag) 6521553Srgrimes ntp->status = MASTER; 6531553Srgrimes else 6541553Srgrimes ntp->status = NOMASTER; 6551553Srgrimes return; 6561553Srgrimes } 6571553Srgrimes 6581553Srgrimes ntp->status = SLAVE; 65930830Scharnier (void)strcpy(mastername, answer->tsp_name); 6601553Srgrimes masteraddr = from; 6611553Srgrimes 6621553Srgrimes /* 6631553Srgrimes * If network has been partitioned, there might be other 6641553Srgrimes * masters; tell the one we have just acknowledged that 6651553Srgrimes * it has to gain control over the others. 6661553Srgrimes */ 6671553Srgrimes ntime.tv_sec = 0; 6681553Srgrimes ntime.tv_usec = 300000; 6691553Srgrimes answer = readmsg(TSP_MASTERACK, ANYADDR, &ntime, ntp); 6701553Srgrimes /* 6711553Srgrimes * checking also not to send CONFLICT to ack'ed master 6721553Srgrimes * due to duplicated MASTERACKs 6731553Srgrimes */ 6741553Srgrimes if (answer != NULL && 6751553Srgrimes strcmp(answer->tsp_name, mastername) != 0) { 6761553Srgrimes conflict.tsp_type = TSP_CONFLICT; 67730830Scharnier (void)strcpy(conflict.tsp_name, hostname); 6781553Srgrimes if (!acksend(&conflict, &masteraddr, mastername, 6791553Srgrimes TSP_ACK, 0, 0)) { 6801553Srgrimes syslog(LOG_ERR, 6811553Srgrimes "error on sending TSP_CONFLICT"); 6821553Srgrimes } 6831553Srgrimes } 6841553Srgrimes} 6851553Srgrimes 6861553Srgrimes/* 6871553Srgrimes * based on the current network configuration, set the status, and count 6881553Srgrimes * networks; 6891553Srgrimes */ 6901553Srgrimesvoid 6911553Srgrimessetstatus() 6921553Srgrimes{ 6931553Srgrimes struct netinfo *ntp; 6941553Srgrimes 6951553Srgrimes status = 0; 6961553Srgrimes nmasternets = nslavenets = nnets = nignorednets = 0; 6971553Srgrimes if (trace) 6981553Srgrimes fprintf(fd, "Net status:\n"); 6991553Srgrimes for (ntp = nettab; ntp != NULL; ntp = ntp->next) { 7001553Srgrimes switch ((int)ntp->status) { 7011553Srgrimes case MASTER: 7021553Srgrimes nmasternets++; 7031553Srgrimes break; 7041553Srgrimes case SLAVE: 7051553Srgrimes nslavenets++; 7061553Srgrimes break; 7071553Srgrimes case NOMASTER: 7081553Srgrimes case IGNORE: 7091553Srgrimes nignorednets++; 7101553Srgrimes break; 7111553Srgrimes } 7121553Srgrimes if (trace) { 7131553Srgrimes fprintf(fd, "\t%-16s", inet_ntoa(ntp->net)); 7141553Srgrimes switch ((int)ntp->status) { 7151553Srgrimes case NOMASTER: 7161553Srgrimes fprintf(fd, "NOMASTER\n"); 7171553Srgrimes break; 7181553Srgrimes case MASTER: 7191553Srgrimes fprintf(fd, "MASTER\n"); 7201553Srgrimes break; 7211553Srgrimes case SLAVE: 7221553Srgrimes fprintf(fd, "SLAVE\n"); 7231553Srgrimes break; 7241553Srgrimes case IGNORE: 7251553Srgrimes fprintf(fd, "IGNORE\n"); 7261553Srgrimes break; 7271553Srgrimes default: 7281553Srgrimes fprintf(fd, "invalid state %d\n", 7291553Srgrimes (int)ntp->status); 7301553Srgrimes break; 7311553Srgrimes } 7321553Srgrimes } 7331553Srgrimes nnets++; 7341553Srgrimes status |= ntp->status; 7351553Srgrimes } 7361553Srgrimes status &= ~IGNORE; 7371553Srgrimes if (trace) 7381553Srgrimes fprintf(fd, 7391553Srgrimes "\tnets=%d masters=%d slaves=%d ignored=%d delay2=%d\n", 7401553Srgrimes nnets, nmasternets, nslavenets, nignorednets, delay2); 7411553Srgrimes} 7421553Srgrimes 7431553Srgrimesvoid 7441553Srgrimesmakeslave(net) 7451553Srgrimes struct netinfo *net; 7461553Srgrimes{ 7471553Srgrimes register struct netinfo *ntp; 7481553Srgrimes 7491553Srgrimes for (ntp = nettab; ntp != NULL; ntp = ntp->next) { 7501553Srgrimes if (ntp->status == SLAVE && ntp != net) 7511553Srgrimes ntp->status = IGNORE; 7521553Srgrimes } 7531553Srgrimes slavenet = net; 7541553Srgrimes} 7551553Srgrimes 7561553Srgrimes/* 7571553Srgrimes * Try to become master over ignored nets.. 7581553Srgrimes */ 7591553Srgrimesstatic void 7601553Srgrimescheckignorednets() 7611553Srgrimes{ 7621553Srgrimes register struct netinfo *ntp; 7631553Srgrimes 7641553Srgrimes for (ntp = nettab; ntp != NULL; ntp = ntp->next) { 7651553Srgrimes if (!Mflag && ntp->status == SLAVE) 7661553Srgrimes break; 7671553Srgrimes 7681553Srgrimes if (ntp->status == IGNORE || ntp->status == NOMASTER) { 7691553Srgrimes lookformaster(ntp); 7701553Srgrimes if (!Mflag && ntp->status == SLAVE) 7711553Srgrimes break; 7721553Srgrimes } 7731553Srgrimes } 7741553Srgrimes} 7751553Srgrimes 7761553Srgrimes/* 7771553Srgrimes * choose a good network on which to be a slave 7781553Srgrimes * The ignored networks must have already been checked. 7791553Srgrimes * Take a hint about for a good network. 7801553Srgrimes */ 7811553Srgrimesstatic void 7821553Srgrimespickslavenet(ntp) 7831553Srgrimes struct netinfo *ntp; 7841553Srgrimes{ 7851553Srgrimes if (slavenet != 0 && slavenet->status == SLAVE) { 7861553Srgrimes makeslave(slavenet); /* prune extras */ 7871553Srgrimes return; 7881553Srgrimes } 7891553Srgrimes 7901553Srgrimes if (ntp == 0 || ntp->status != SLAVE) { 7911553Srgrimes for (ntp = nettab; ntp != 0; ntp = ntp->next) { 7921553Srgrimes if (ntp->status == SLAVE) 7931553Srgrimes break; 7941553Srgrimes } 7951553Srgrimes } 7961553Srgrimes makeslave(ntp); 7971553Srgrimes} 7981553Srgrimes 7991553Srgrimes/* 8001553Srgrimes * returns a random number in the range [inf, sup] 8011553Srgrimes */ 8021553Srgrimeslong 8031553Srgrimescasual(inf, sup) 8041553Srgrimes long inf, sup; 8051553Srgrimes{ 8061553Srgrimes double value; 8071553Srgrimes 8081553Srgrimes value = ((double)(random() & 0x7fffffff)) / (0x7fffffff*1.0); 8091553Srgrimes return(inf + (sup - inf)*value); 8101553Srgrimes} 8111553Srgrimes 8121553Srgrimeschar * 8131553Srgrimesdate() 8141553Srgrimes{ 8151553Srgrimes#ifdef sgi 8161553Srgrimes struct timeval tv; 8171553Srgrimes static char tm[32]; 8181553Srgrimes 8191553Srgrimes (void)gettimeofday(&tv, (struct timezone *)0); 8201553Srgrimes (void)cftime(tm, "%D %T", &tv.tv_sec); 8211553Srgrimes return (tm); 8221553Srgrimes#else 8231553Srgrimes struct timeval tv; 8241553Srgrimes 8251553Srgrimes (void)gettimeofday(&tv, (struct timezone *)0); 8261553Srgrimes return (ctime(&tv.tv_sec)); 8271553Srgrimes#endif /* sgi */ 8281553Srgrimes} 8291553Srgrimes 8301553Srgrimesvoid 8311553Srgrimesaddnetname(name) 8321553Srgrimes char *name; 8331553Srgrimes{ 8341553Srgrimes register struct nets **netlist = &nets; 8351553Srgrimes 8361553Srgrimes while (*netlist) 8371553Srgrimes netlist = &((*netlist)->next); 8381553Srgrimes *netlist = (struct nets *)malloc(sizeof **netlist); 83930642Scharnier if (*netlist == 0) 84030642Scharnier errx(1, "malloc failed"); 8411553Srgrimes bzero((char *)*netlist, sizeof(**netlist)); 8421553Srgrimes (*netlist)->name = name; 8431553Srgrimes} 8441553Srgrimes 8451553Srgrimes/* note a host as trustworthy */ 8461553Srgrimesstatic void 8471553Srgrimesadd_good_host(name, perm) 8481553Srgrimes char *name; 8491553Srgrimes int perm; /* 1=not part of the netgroup */ 8501553Srgrimes{ 8511553Srgrimes register struct goodhost *ghp; 8521553Srgrimes register struct hostent *hentp; 8531553Srgrimes 8541553Srgrimes ghp = (struct goodhost*)malloc(sizeof(*ghp)); 8551553Srgrimes if (!ghp) { 8561553Srgrimes syslog(LOG_ERR, "malloc failed"); 8571553Srgrimes exit(1); 8581553Srgrimes } 8591553Srgrimes 8601553Srgrimes bzero((char*)ghp, sizeof(*ghp)); 8611553Srgrimes (void)strncpy(&ghp->name[0], name, sizeof(ghp->name)); 8621553Srgrimes ghp->next = goodhosts; 8631553Srgrimes ghp->perm = perm; 8641553Srgrimes goodhosts = ghp; 8651553Srgrimes 8661553Srgrimes hentp = gethostbyname(name); 8671553Srgrimes if (0 == hentp && perm) 86830642Scharnier warnx("unknown host %s", name); 8691553Srgrimes} 8701553Srgrimes 8711553Srgrimes 8721553Srgrimes/* update our image of the net-group of trustworthy hosts 8731553Srgrimes */ 8741553Srgrimesvoid 8751553Srgrimesget_goodgroup(force) 8761553Srgrimes int force; 8771553Srgrimes{ 8781553Srgrimes# define NG_DELAY (30*60*CLK_TCK) /* 30 minutes */ 8791553Srgrimes static unsigned long last_update = -NG_DELAY; 8801553Srgrimes unsigned long new_update; 88130642Scharnier struct goodhost *ghp, **ghpp; 88230642Scharnier#ifdef HAVENIS 8831553Srgrimes struct hosttbl *htp; 8841553Srgrimes char *mach, *usr, *dom; 88530642Scharnier#endif /* HAVENIS */ 8861553Srgrimes struct tms tm; 8871553Srgrimes 8881553Srgrimes 8891553Srgrimes /* if no netgroup, then we are finished */ 8901553Srgrimes if (goodgroup == 0 || !Mflag) 8911553Srgrimes return; 8921553Srgrimes 8931553Srgrimes /* Do not chatter with the netgroup master too often. 8941553Srgrimes */ 8951553Srgrimes new_update = times(&tm); 8961553Srgrimes if (new_update < last_update + NG_DELAY 8971553Srgrimes && !force) 8981553Srgrimes return; 8991553Srgrimes last_update = new_update; 9001553Srgrimes 9011553Srgrimes /* forget the old temporary entries */ 9021553Srgrimes ghpp = &goodhosts; 9031553Srgrimes while (0 != (ghp = *ghpp)) { 9041553Srgrimes if (!ghp->perm) { 9051553Srgrimes *ghpp = ghp->next; 9061553Srgrimes free((char*)ghp); 9071553Srgrimes } else { 9081553Srgrimes ghpp = &ghp->next; 9091553Srgrimes } 9101553Srgrimes } 9111553Srgrimes 9121553Srgrimes#ifdef HAVENIS 9131553Srgrimes /* quit now if we are not one of the trusted masters 9141553Srgrimes */ 9151553Srgrimes if (!innetgr(goodgroup, &hostname[0], 0,0)) { 9161553Srgrimes if (trace) 9171553Srgrimes (void)fprintf(fd, "get_goodgroup: %s not in %s\n", 9181553Srgrimes &hostname[0], goodgroup); 9191553Srgrimes return; 9201553Srgrimes } 9211553Srgrimes if (trace) 9221553Srgrimes (void)fprintf(fd, "get_goodgroup: %s in %s\n", 9231553Srgrimes &hostname[0], goodgroup); 9241553Srgrimes 9251553Srgrimes /* mark the entire netgroup as trusted */ 9261553Srgrimes (void)setnetgrent(goodgroup); 9271553Srgrimes while (getnetgrent(&mach,&usr,&dom)) { 9281553Srgrimes if (0 != mach) 9291553Srgrimes add_good_host(mach,0); 9301553Srgrimes } 9311553Srgrimes (void)endnetgrent(); 9321553Srgrimes 9331553Srgrimes /* update list of slaves */ 9341553Srgrimes for (htp = self.l_fwd; htp != &self; htp = htp->l_fwd) { 9351553Srgrimes htp->good = good_host_name(&htp->name[0]); 9361553Srgrimes } 9371553Srgrimes#endif /* HAVENIS */ 9381553Srgrimes} 9391553Srgrimes 9401553Srgrimes 9411553Srgrimes/* see if a machine is trustworthy 9421553Srgrimes */ 9431553Srgrimesint /* 1=trust hp to change our date */ 9441553Srgrimesgood_host_name(name) 9451553Srgrimes char *name; 9461553Srgrimes{ 9471553Srgrimes register struct goodhost *ghp = goodhosts; 9481553Srgrimes register char c; 9491553Srgrimes 9501553Srgrimes if (!ghp || !Mflag) /* trust everyone if no one named */ 9511553Srgrimes return 1; 9521553Srgrimes 9531553Srgrimes c = *name; 9541553Srgrimes do { 9551553Srgrimes if (c == ghp->name[0] 9561553Srgrimes && !strcasecmp(name, ghp->name)) 9571553Srgrimes return 1; /* found him, so say so */ 9581553Srgrimes } while (0 != (ghp = ghp->next)); 9591553Srgrimes 9601553Srgrimes if (!strcasecmp(name,hostname)) /* trust ourself */ 9611553Srgrimes return 1; 9621553Srgrimes 9631553Srgrimes return 0; /* did not find him */ 9641553Srgrimes} 965