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 * 4. Neither the name of the University nor the names of its contributors 141553Srgrimes * may be used to endorse or promote products derived from this software 151553Srgrimes * without specific prior written permission. 161553Srgrimes * 171553Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 181553Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 191553Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 201553Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 211553Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 221553Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 231553Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 241553Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 251553Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 261553Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 271553Srgrimes * SUCH DAMAGE. 281553Srgrimes */ 291553Srgrimes 301553Srgrimes#ifndef lint 3130642Scharnierstatic const char copyright[] = 321553Srgrimes"@(#) Copyright (c) 1985, 1993\n\ 331553Srgrimes The Regents of the University of California. All rights reserved.\n"; 341553Srgrimes#endif /* not lint */ 351553Srgrimes 36117278Scharnier#if 0 371553Srgrimes#ifndef lint 381553Srgrimesstatic char sccsid[] = "@(#)timed.c 8.1 (Berkeley) 6/6/93"; 39117278Scharnier#endif /* not lint */ 4030642Scharnier#endif 411553Srgrimes 42117278Scharnier#include <sys/cdefs.h> 43117278Scharnier__FBSDID("$FreeBSD$"); 44117278Scharnier 451553Srgrimes#define TSPTYPES 461553Srgrimes#include "globals.h" 471553Srgrimes#include <net/if.h> 481553Srgrimes#include <sys/file.h> 491553Srgrimes#include <sys/ioctl.h> 501553Srgrimes#include <setjmp.h> 511553Srgrimes#include "pathnames.h" 521553Srgrimes#include <math.h> 531553Srgrimes#include <sys/types.h> 541553Srgrimes#include <sys/times.h> 551553Srgrimes 561553Srgrimesint trace = 0; 571553Srgrimesint sock, sock_raw = -1; 581553Srgrimesint status = 0; 591553Srgrimesu_short sequence; /* sequence number */ 601553Srgrimeslong delay1; 611553Srgrimeslong delay2; 621553Srgrimes 631553Srgrimesint nslavenets; /* nets were I could be a slave */ 641553Srgrimesint nmasternets; /* nets were I could be a master */ 651553Srgrimesint nignorednets; /* ignored nets */ 661553Srgrimesint nnets; /* nets I am connected to */ 671553Srgrimes 681553SrgrimesFILE *fd; /* trace file FD */ 691553Srgrimes 701553Srgrimesjmp_buf jmpenv; 711553Srgrimes 721553Srgrimesstruct netinfo *nettab = 0; 731553Srgrimesstruct netinfo *slavenet; 741553Srgrimesint Mflag; 751553Srgrimesint justquit = 0; 761553Srgrimesint debug; 771553Srgrimes 781553Srgrimesstatic struct nets { 791553Srgrimes char *name; 801553Srgrimes long net; 811553Srgrimes struct nets *next; 821553Srgrimes} *nets = 0; 831553Srgrimes 841553Srgrimesstruct hosttbl hosttbl[NHOSTS+1]; /* known hosts */ 851553Srgrimes 861553Srgrimesstatic struct goodhost { /* hosts that we trust */ 8730872Scharnier char name[MAXHOSTNAMELEN]; 881553Srgrimes struct goodhost *next; 891553Srgrimes char perm; 901553Srgrimes} *goodhosts; 911553Srgrimes 921553Srgrimesstatic char *goodgroup; /* net group of trusted hosts */ 93117278Scharnierstatic void checkignorednets(void); 94117278Scharnierstatic void pickslavenet(struct netinfo *); 95117278Scharnierstatic void add_good_host(char *, int); 96117278Scharnierstatic void usage(void); 971553Srgrimes 981553Srgrimes/* 991553Srgrimes * The timedaemons synchronize the clocks of hosts in a local area network. 1001553Srgrimes * One daemon runs as master, all the others as slaves. The master 1011553Srgrimes * performs the task of computing clock differences and sends correction 1021553Srgrimes * values to the slaves. 1031553Srgrimes * Slaves start an election to choose a new master when the latter disappears 1041553Srgrimes * because of a machine crash, network partition, or when killed. 1051553Srgrimes * A resolution protocol is used to kill all but one of the masters 1061553Srgrimes * that happen to exist in segments of a partitioned network when the 1071553Srgrimes * network partition is fixed. 1081553Srgrimes * 1091553Srgrimes * Authors: Riccardo Gusella & Stefano Zatti 1101553Srgrimes * 1111553Srgrimes * overhauled at Silicon Graphics 1121553Srgrimes */ 1131553Srgrimesint 1141553Srgrimesmain(argc, argv) 1151553Srgrimes int argc; 1161553Srgrimes char *argv[]; 1171553Srgrimes{ 1181553Srgrimes int on; 1191553Srgrimes int ret; 1201553Srgrimes int nflag, iflag; 1211553Srgrimes struct timeval ntime; 1221553Srgrimes struct servent *srvp; 1231553Srgrimes char buf[BUFSIZ], *cp, *cplim; 1241553Srgrimes struct ifconf ifc; 1251553Srgrimes struct ifreq ifreq, ifreqf, *ifr; 1261553Srgrimes register struct netinfo *ntp; 1271553Srgrimes struct netinfo *ntip; 1281553Srgrimes struct netinfo *savefromnet; 1291553Srgrimes struct netent *nentp; 1301553Srgrimes struct nets *nt; 1311553Srgrimes struct sockaddr_in server; 1321553Srgrimes u_short port; 133179485Simp int c; 1341553Srgrimes 1351553Srgrimes#ifdef lint 1361553Srgrimes ntip = NULL; 1371553Srgrimes#endif 1381553Srgrimes 1391553Srgrimes on = 1; 1401553Srgrimes nflag = OFF; 1411553Srgrimes iflag = OFF; 1421553Srgrimes 1431553Srgrimes 1441553Srgrimes opterr = 0; 14524428Simp while ((c = getopt(argc, argv, "Mtdn:i:F:G:P:")) != -1) { 1461553Srgrimes switch (c) { 1471553Srgrimes case 'M': 1481553Srgrimes Mflag = 1; 1491553Srgrimes break; 1501553Srgrimes 1511553Srgrimes case 't': 1521553Srgrimes trace = 1; 1531553Srgrimes break; 1541553Srgrimes 1551553Srgrimes case 'n': 1561553Srgrimes if (iflag) { 15730642Scharnier errx(1, "-i and -n make no sense together"); 1581553Srgrimes } else { 1591553Srgrimes nflag = ON; 1601553Srgrimes addnetname(optarg); 1611553Srgrimes } 1621553Srgrimes break; 1631553Srgrimes 1641553Srgrimes case 'i': 1651553Srgrimes if (nflag) { 16630642Scharnier errx(1, "-i and -n make no sense together"); 1671553Srgrimes } else { 1681553Srgrimes iflag = ON; 1691553Srgrimes addnetname(optarg); 1701553Srgrimes } 1711553Srgrimes break; 1721553Srgrimes 1731553Srgrimes case 'F': 1741553Srgrimes add_good_host(optarg,1); 1751553Srgrimes while (optind < argc && argv[optind][0] != '-') 1761553Srgrimes add_good_host(argv[optind++], 1); 1771553Srgrimes break; 1781553Srgrimes 1791553Srgrimes case 'd': 1801553Srgrimes debug = 1; 1811553Srgrimes break; 1821553Srgrimes case 'G': 18330642Scharnier if (goodgroup != 0) 18430642Scharnier errx(1, "only one net group"); 1851553Srgrimes goodgroup = optarg; 1861553Srgrimes break; 1871553Srgrimes 1881553Srgrimes default: 18930642Scharnier usage(); 1901553Srgrimes break; 1911553Srgrimes } 1921553Srgrimes } 19330642Scharnier if (optind < argc) 19430642Scharnier usage(); 1951553Srgrimes 1961553Srgrimes /* If we care about which machine is the master, then we must 1971553Srgrimes * be willing to be a master 1981553Srgrimes */ 1991553Srgrimes if (0 != goodgroup || 0 != goodhosts) 2001553Srgrimes Mflag = 1; 2011553Srgrimes 20230642Scharnier if (gethostname(hostname, sizeof(hostname) - 1) < 0) 20330642Scharnier err(1, "gethostname"); 2041553Srgrimes self.l_bak = &self; 2051553Srgrimes self.l_fwd = &self; 2061553Srgrimes self.h_bak = &self; 2071553Srgrimes self.h_fwd = &self; 2081553Srgrimes self.head = 1; 2091553Srgrimes self.good = 1; 2101553Srgrimes 2111553Srgrimes if (goodhosts != 0) /* trust ourself */ 2121553Srgrimes add_good_host(hostname,1); 2131553Srgrimes 2141553Srgrimes srvp = getservbyname("timed", "udp"); 21530642Scharnier if (srvp == 0) 216117278Scharnier errx(1, "timed/udp: unknown service"); 2171553Srgrimes port = srvp->s_port; 2188532Sdg bzero(&server, sizeof(struct sockaddr_in)); 2191553Srgrimes server.sin_port = srvp->s_port; 2201553Srgrimes server.sin_family = AF_INET; 2211553Srgrimes sock = socket(AF_INET, SOCK_DGRAM, 0); 22230642Scharnier if (sock < 0) 22330642Scharnier err(1, "socket"); 2241553Srgrimes if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&on, 22530642Scharnier sizeof(on)) < 0) 22630642Scharnier err(1, "setsockopt"); 2271553Srgrimes if (bind(sock, (struct sockaddr*)&server, sizeof(server))) { 2281553Srgrimes if (errno == EADDRINUSE) 22930642Scharnier warnx("time daemon already running"); 2301553Srgrimes else 23130642Scharnier warn("bind"); 2321553Srgrimes exit(1); 2331553Srgrimes } 2341553Srgrimes 2351553Srgrimes /* choose a unique seed for random number generation */ 2361553Srgrimes (void)gettimeofday(&ntime, 0); 2371553Srgrimes srandom(ntime.tv_sec + ntime.tv_usec); 2381553Srgrimes 2391553Srgrimes sequence = random(); /* initial seq number */ 2401553Srgrimes 2411553Srgrimes /* rounds kernel variable time to multiple of 5 ms. */ 2421553Srgrimes ntime.tv_sec = 0; 2431553Srgrimes ntime.tv_usec = -((ntime.tv_usec/1000) % 5) * 1000; 2441553Srgrimes (void)adjtime(&ntime, (struct timeval *)0); 2451553Srgrimes 2461553Srgrimes for (nt = nets; nt; nt = nt->next) { 2471553Srgrimes nentp = getnetbyname(nt->name); 2481553Srgrimes if (nentp == 0) { 2491553Srgrimes nt->net = inet_network(nt->name); 2501553Srgrimes if (nt->net != INADDR_NONE) 2511553Srgrimes nentp = getnetbyaddr(nt->net, AF_INET); 2521553Srgrimes } 2531553Srgrimes if (nentp != 0) { 2541553Srgrimes nt->net = nentp->n_net; 2551553Srgrimes } else if (nt->net == INADDR_NONE) { 25630642Scharnier errx(1, "unknown net %s", nt->name); 2571553Srgrimes } else if (nt->net == INADDR_ANY) { 25830642Scharnier errx(1, "bad net %s", nt->name); 2591553Srgrimes } else { 26030642Scharnier warnx("warning: %s unknown in /etc/networks", 2611553Srgrimes nt->name); 2621553Srgrimes } 2631553Srgrimes 2641553Srgrimes if (0 == (nt->net & 0xff000000)) 2651553Srgrimes nt->net <<= 8; 2661553Srgrimes if (0 == (nt->net & 0xff000000)) 2671553Srgrimes nt->net <<= 8; 2681553Srgrimes if (0 == (nt->net & 0xff000000)) 2691553Srgrimes nt->net <<= 8; 2701553Srgrimes } 2711553Srgrimes ifc.ifc_len = sizeof(buf); 2721553Srgrimes ifc.ifc_buf = buf; 27330642Scharnier if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) 27430642Scharnier err(1, "get interface configuration"); 2751553Srgrimes ntp = NULL; 2761553Srgrimes#define size(p) max((p).sa_len, sizeof(p)) 2771553Srgrimes cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */ 2781553Srgrimes for (cp = buf; cp < cplim; 2791553Srgrimes cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) { 2801553Srgrimes ifr = (struct ifreq *)cp; 2811553Srgrimes if (ifr->ifr_addr.sa_family != AF_INET) 2821553Srgrimes continue; 2831553Srgrimes if (!ntp) 2841553Srgrimes ntp = (struct netinfo*)malloc(sizeof(struct netinfo)); 2851553Srgrimes bzero(ntp,sizeof(*ntp)); 2861553Srgrimes ntp->my_addr=((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 2871553Srgrimes ntp->status = NOMASTER; 2881553Srgrimes ifreq = *ifr; 2891553Srgrimes ifreqf = *ifr; 2901553Srgrimes 2911553Srgrimes if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreqf) < 0) { 29230642Scharnier warn("get interface flags"); 2931553Srgrimes continue; 2941553Srgrimes } 2951553Srgrimes if ((ifreqf.ifr_flags & IFF_UP) == 0) 2961553Srgrimes continue; 2971553Srgrimes if ((ifreqf.ifr_flags & IFF_BROADCAST) == 0 && 2981553Srgrimes (ifreqf.ifr_flags & IFF_POINTOPOINT) == 0) { 2991553Srgrimes continue; 3001553Srgrimes } 3011553Srgrimes 3021553Srgrimes 3031553Srgrimes if (ioctl(sock, SIOCGIFNETMASK, (char *)&ifreq) < 0) { 30430642Scharnier warn("get netmask"); 3051553Srgrimes continue; 3061553Srgrimes } 3071553Srgrimes ntp->mask = ((struct sockaddr_in *) 3081553Srgrimes &ifreq.ifr_addr)->sin_addr.s_addr; 3091553Srgrimes 3101553Srgrimes if (ifreqf.ifr_flags & IFF_BROADCAST) { 3111553Srgrimes if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) { 31230642Scharnier warn("get broadaddr"); 3131553Srgrimes continue; 3141553Srgrimes } 3151553Srgrimes ntp->dest_addr = *(struct sockaddr_in *)&ifreq.ifr_broadaddr; 3161553Srgrimes /* What if the broadcast address is all ones? 3171553Srgrimes * So we cannot just mask ntp->dest_addr. */ 3181553Srgrimes ntp->net = ntp->my_addr; 3191553Srgrimes ntp->net.s_addr &= ntp->mask; 3201553Srgrimes } else { 3211553Srgrimes if (ioctl(sock, SIOCGIFDSTADDR, 3221553Srgrimes (char *)&ifreq) < 0) { 32330642Scharnier warn("get destaddr"); 3241553Srgrimes continue; 3251553Srgrimes } 3261553Srgrimes ntp->dest_addr = *(struct sockaddr_in *)&ifreq.ifr_dstaddr; 3271553Srgrimes ntp->net = ntp->dest_addr.sin_addr; 3281553Srgrimes } 3291553Srgrimes 3301553Srgrimes ntp->dest_addr.sin_port = port; 3311553Srgrimes 3321553Srgrimes for (nt = nets; nt; nt = nt->next) { 33328547Sjlemon if (ntp->net.s_addr == htonl(nt->net)) 3341553Srgrimes break; 3351553Srgrimes } 33630642Scharnier if ((nflag && !nt) || (iflag && nt)) 3371553Srgrimes continue; 3381553Srgrimes 3391553Srgrimes ntp->next = NULL; 3401553Srgrimes if (nettab == NULL) { 3411553Srgrimes nettab = ntp; 3421553Srgrimes } else { 3431553Srgrimes ntip->next = ntp; 3441553Srgrimes } 3451553Srgrimes ntip = ntp; 3461553Srgrimes ntp = NULL; 3471553Srgrimes } 3481553Srgrimes if (ntp) 3491553Srgrimes (void) free((char *)ntp); 35030642Scharnier if (nettab == NULL) 35130642Scharnier errx(1, "no network usable"); 3521553Srgrimes 3531553Srgrimes /* microseconds to delay before responding to a broadcast */ 3541553Srgrimes delay1 = casual(1, 100*1000); 3551553Srgrimes 3561553Srgrimes /* election timer delay in secs. */ 3571553Srgrimes delay2 = casual(MINTOUT, MAXTOUT); 3581553Srgrimes 3591553Srgrimes if (!debug) 3601553Srgrimes daemon(debug, 0); 3611553Srgrimes 3621553Srgrimes if (trace) 3631553Srgrimes traceon(); 3641553Srgrimes openlog("timed", LOG_CONS|LOG_PID, LOG_DAEMON); 3651553Srgrimes 3661553Srgrimes /* 3671553Srgrimes * keep returning here 3681553Srgrimes */ 3691553Srgrimes ret = setjmp(jmpenv); 3701553Srgrimes savefromnet = fromnet; 3711553Srgrimes setstatus(); 3721553Srgrimes 3731553Srgrimes if (Mflag) { 3741553Srgrimes switch (ret) { 3751553Srgrimes 3761553Srgrimes case 0: 3771553Srgrimes checkignorednets(); 3781553Srgrimes pickslavenet(0); 3791553Srgrimes break; 3801553Srgrimes case 1: 3811553Srgrimes /* Just lost our master */ 3821553Srgrimes if (slavenet != 0) 3831553Srgrimes slavenet->status = election(slavenet); 3841553Srgrimes if (!slavenet || slavenet->status == MASTER) { 3851553Srgrimes checkignorednets(); 3861553Srgrimes pickslavenet(0); 3871553Srgrimes } else { 3881553Srgrimes makeslave(slavenet); /* prune extras */ 3891553Srgrimes } 3901553Srgrimes break; 3911553Srgrimes 3921553Srgrimes case 2: 3931553Srgrimes /* Just been told to quit */ 3941553Srgrimes justquit = 1; 3951553Srgrimes pickslavenet(savefromnet); 3961553Srgrimes break; 3971553Srgrimes } 3981553Srgrimes 3991553Srgrimes setstatus(); 4001553Srgrimes if (!(status & MASTER) && sock_raw != -1) { 4011553Srgrimes /* sock_raw is not being used now */ 4021553Srgrimes (void)close(sock_raw); 4031553Srgrimes sock_raw = -1; 4041553Srgrimes } 4051553Srgrimes 4061553Srgrimes if (status == MASTER) 4071553Srgrimes master(); 4081553Srgrimes else 4091553Srgrimes slave(); 4101553Srgrimes 4111553Srgrimes } else { 4121553Srgrimes if (sock_raw != -1) { 4131553Srgrimes (void)close(sock_raw); 4141553Srgrimes sock_raw = -1; 4151553Srgrimes } 4161553Srgrimes 4171553Srgrimes if (ret) { 4181553Srgrimes /* we just lost our master or were told to quit */ 4191553Srgrimes justquit = 1; 4201553Srgrimes } 4211553Srgrimes for (ntp = nettab; ntp != NULL; ntp = ntp->next) { 422240626Skevlo if (ntp->status == MASTER) { 4231553Srgrimes rmnetmachs(ntp); 4241553Srgrimes ntp->status = NOMASTER; 425240626Skevlo } 4261553Srgrimes } 4271553Srgrimes checkignorednets(); 4281553Srgrimes pickslavenet(0); 4291553Srgrimes setstatus(); 4301553Srgrimes 4311553Srgrimes slave(); 4321553Srgrimes } 4331553Srgrimes /* NOTREACHED */ 4341553Srgrimes return(0); 4351553Srgrimes} 4361553Srgrimes 43730642Scharnierstatic void 43830642Scharnierusage() 43930642Scharnier{ 44030642Scharnier#ifdef HAVENIS 44130642Scharnier fprintf(stderr, 44230642Scharnier"usage: timed [-dtM] [-i net|-n net] [-F host1 host2 ...] [-G netgp]\n"); 44330642Scharnier#else 44430642Scharnier fprintf(stderr, 44530642Scharnier"usage: timed [-dtM] [-i net|-n net] [-F host1 host2 ...]\n"); 44630642Scharnier#endif /* HAVENIS */ 44730642Scharnier exit(1); 44830642Scharnier} 44930642Scharnier 4501553Srgrimes/* 4511553Srgrimes * suppress an upstart, untrustworthy, self-appointed master 4521553Srgrimes */ 4531553Srgrimesvoid 4541553Srgrimessuppress(addr, name,net) 4551553Srgrimes struct sockaddr_in *addr; 4561553Srgrimes char *name; 4571553Srgrimes struct netinfo *net; 4581553Srgrimes{ 4591553Srgrimes struct sockaddr_in tgt; 4601553Srgrimes char tname[MAXHOSTNAMELEN]; 4611553Srgrimes struct tsp msg; 4621553Srgrimes static struct timeval wait; 4631553Srgrimes 4641553Srgrimes if (trace) 4651553Srgrimes fprintf(fd, "suppress: %s\n", name); 4661553Srgrimes tgt = *addr; 46730830Scharnier (void)strcpy(tname, name); 4681553Srgrimes 4691553Srgrimes while (0 != readmsg(TSP_ANY, ANYADDR, &wait, net)) { 4701553Srgrimes if (trace) 4711553Srgrimes fprintf(fd, "suppress:\tdiscarded packet from %s\n", 4721553Srgrimes name); 4731553Srgrimes } 4741553Srgrimes 4751553Srgrimes syslog(LOG_NOTICE, "suppressing false master %s", tname); 4761553Srgrimes msg.tsp_type = TSP_QUIT; 47730830Scharnier (void)strcpy(msg.tsp_name, hostname); 4781553Srgrimes (void)acksend(&msg, &tgt, tname, TSP_ACK, 0, 1); 4791553Srgrimes} 4801553Srgrimes 4811553Srgrimesvoid 4821553Srgrimeslookformaster(ntp) 4831553Srgrimes struct netinfo *ntp; 4841553Srgrimes{ 4851553Srgrimes struct tsp resp, conflict, *answer; 4861553Srgrimes struct timeval ntime; 4871553Srgrimes char mastername[MAXHOSTNAMELEN]; 4881553Srgrimes struct sockaddr_in masteraddr; 4891553Srgrimes 4901553Srgrimes get_goodgroup(0); 4911553Srgrimes ntp->status = SLAVE; 4921553Srgrimes 4931553Srgrimes /* look for master */ 4941553Srgrimes resp.tsp_type = TSP_MASTERREQ; 49530830Scharnier (void)strcpy(resp.tsp_name, hostname); 4961553Srgrimes answer = acksend(&resp, &ntp->dest_addr, ANYADDR, 4971553Srgrimes TSP_MASTERACK, ntp, 0); 4981553Srgrimes if (answer != 0 && !good_host_name(answer->tsp_name)) { 4991553Srgrimes suppress(&from, answer->tsp_name, ntp); 5001553Srgrimes ntp->status = NOMASTER; 5011553Srgrimes answer = 0; 5021553Srgrimes } 5031553Srgrimes if (answer == 0) { 5041553Srgrimes /* 5051553Srgrimes * Various conditions can cause conflict: races between 5061553Srgrimes * two just started timedaemons when no master is 5071553Srgrimes * present, or timedaemons started during an election. 5081553Srgrimes * A conservative approach is taken. Give up and became a 5091553Srgrimes * slave, postponing election of a master until first 5101553Srgrimes * timer expires. 5111553Srgrimes */ 5121553Srgrimes ntime.tv_sec = ntime.tv_usec = 0; 5131553Srgrimes answer = readmsg(TSP_MASTERREQ, ANYADDR, &ntime, ntp); 5141553Srgrimes if (answer != 0) { 5151553Srgrimes if (!good_host_name(answer->tsp_name)) { 5161553Srgrimes suppress(&from, answer->tsp_name, ntp); 5171553Srgrimes ntp->status = NOMASTER; 5181553Srgrimes } 5191553Srgrimes return; 5201553Srgrimes } 5211553Srgrimes 5221553Srgrimes ntime.tv_sec = ntime.tv_usec = 0; 5231553Srgrimes answer = readmsg(TSP_MASTERUP, ANYADDR, &ntime, ntp); 5241553Srgrimes if (answer != 0) { 5251553Srgrimes if (!good_host_name(answer->tsp_name)) { 5261553Srgrimes suppress(&from, answer->tsp_name, ntp); 5271553Srgrimes ntp->status = NOMASTER; 5281553Srgrimes } 5291553Srgrimes return; 5301553Srgrimes } 5311553Srgrimes 5321553Srgrimes ntime.tv_sec = ntime.tv_usec = 0; 5331553Srgrimes answer = readmsg(TSP_ELECTION, ANYADDR, &ntime, ntp); 5341553Srgrimes if (answer != 0) { 5351553Srgrimes if (!good_host_name(answer->tsp_name)) { 5361553Srgrimes suppress(&from, answer->tsp_name, ntp); 5371553Srgrimes ntp->status = NOMASTER; 5381553Srgrimes } 5391553Srgrimes return; 5401553Srgrimes } 5411553Srgrimes 5421553Srgrimes if (Mflag) 5431553Srgrimes ntp->status = MASTER; 5441553Srgrimes else 5451553Srgrimes ntp->status = NOMASTER; 5461553Srgrimes return; 5471553Srgrimes } 5481553Srgrimes 5491553Srgrimes ntp->status = SLAVE; 55030830Scharnier (void)strcpy(mastername, answer->tsp_name); 5511553Srgrimes masteraddr = from; 5521553Srgrimes 5531553Srgrimes /* 5541553Srgrimes * If network has been partitioned, there might be other 5551553Srgrimes * masters; tell the one we have just acknowledged that 5561553Srgrimes * it has to gain control over the others. 5571553Srgrimes */ 5581553Srgrimes ntime.tv_sec = 0; 5591553Srgrimes ntime.tv_usec = 300000; 5601553Srgrimes answer = readmsg(TSP_MASTERACK, ANYADDR, &ntime, ntp); 5611553Srgrimes /* 5621553Srgrimes * checking also not to send CONFLICT to ack'ed master 5631553Srgrimes * due to duplicated MASTERACKs 5641553Srgrimes */ 5651553Srgrimes if (answer != NULL && 5661553Srgrimes strcmp(answer->tsp_name, mastername) != 0) { 5671553Srgrimes conflict.tsp_type = TSP_CONFLICT; 56830830Scharnier (void)strcpy(conflict.tsp_name, hostname); 5691553Srgrimes if (!acksend(&conflict, &masteraddr, mastername, 5701553Srgrimes TSP_ACK, 0, 0)) { 5711553Srgrimes syslog(LOG_ERR, 5721553Srgrimes "error on sending TSP_CONFLICT"); 5731553Srgrimes } 5741553Srgrimes } 5751553Srgrimes} 5761553Srgrimes 5771553Srgrimes/* 5781553Srgrimes * based on the current network configuration, set the status, and count 5791553Srgrimes * networks; 5801553Srgrimes */ 5811553Srgrimesvoid 5821553Srgrimessetstatus() 5831553Srgrimes{ 5841553Srgrimes struct netinfo *ntp; 5851553Srgrimes 5861553Srgrimes status = 0; 5871553Srgrimes nmasternets = nslavenets = nnets = nignorednets = 0; 5881553Srgrimes if (trace) 5891553Srgrimes fprintf(fd, "Net status:\n"); 5901553Srgrimes for (ntp = nettab; ntp != NULL; ntp = ntp->next) { 5911553Srgrimes switch ((int)ntp->status) { 5921553Srgrimes case MASTER: 5931553Srgrimes nmasternets++; 5941553Srgrimes break; 5951553Srgrimes case SLAVE: 5961553Srgrimes nslavenets++; 5971553Srgrimes break; 5981553Srgrimes case NOMASTER: 5991553Srgrimes case IGNORE: 6001553Srgrimes nignorednets++; 6011553Srgrimes break; 6021553Srgrimes } 6031553Srgrimes if (trace) { 6041553Srgrimes fprintf(fd, "\t%-16s", inet_ntoa(ntp->net)); 6051553Srgrimes switch ((int)ntp->status) { 6061553Srgrimes case NOMASTER: 6071553Srgrimes fprintf(fd, "NOMASTER\n"); 6081553Srgrimes break; 6091553Srgrimes case MASTER: 6101553Srgrimes fprintf(fd, "MASTER\n"); 6111553Srgrimes break; 6121553Srgrimes case SLAVE: 6131553Srgrimes fprintf(fd, "SLAVE\n"); 6141553Srgrimes break; 6151553Srgrimes case IGNORE: 6161553Srgrimes fprintf(fd, "IGNORE\n"); 6171553Srgrimes break; 6181553Srgrimes default: 6191553Srgrimes fprintf(fd, "invalid state %d\n", 6201553Srgrimes (int)ntp->status); 6211553Srgrimes break; 6221553Srgrimes } 6231553Srgrimes } 6241553Srgrimes nnets++; 6251553Srgrimes status |= ntp->status; 6261553Srgrimes } 6271553Srgrimes status &= ~IGNORE; 6281553Srgrimes if (trace) 6291553Srgrimes fprintf(fd, 63037268Sbde "\tnets=%d masters=%d slaves=%d ignored=%d delay2=%ld\n", 63137268Sbde nnets, nmasternets, nslavenets, nignorednets, delay2); 6321553Srgrimes} 6331553Srgrimes 6341553Srgrimesvoid 6351553Srgrimesmakeslave(net) 6361553Srgrimes struct netinfo *net; 6371553Srgrimes{ 6381553Srgrimes register struct netinfo *ntp; 6391553Srgrimes 6401553Srgrimes for (ntp = nettab; ntp != NULL; ntp = ntp->next) { 6411553Srgrimes if (ntp->status == SLAVE && ntp != net) 6421553Srgrimes ntp->status = IGNORE; 6431553Srgrimes } 6441553Srgrimes slavenet = net; 6451553Srgrimes} 6461553Srgrimes 6471553Srgrimes/* 6481553Srgrimes * Try to become master over ignored nets.. 6491553Srgrimes */ 6501553Srgrimesstatic void 6511553Srgrimescheckignorednets() 6521553Srgrimes{ 6531553Srgrimes register struct netinfo *ntp; 6541553Srgrimes 6551553Srgrimes for (ntp = nettab; ntp != NULL; ntp = ntp->next) { 6561553Srgrimes if (!Mflag && ntp->status == SLAVE) 6571553Srgrimes break; 6581553Srgrimes 6591553Srgrimes if (ntp->status == IGNORE || ntp->status == NOMASTER) { 6601553Srgrimes lookformaster(ntp); 6611553Srgrimes if (!Mflag && ntp->status == SLAVE) 6621553Srgrimes break; 6631553Srgrimes } 6641553Srgrimes } 6651553Srgrimes} 6661553Srgrimes 6671553Srgrimes/* 6681553Srgrimes * choose a good network on which to be a slave 6691553Srgrimes * The ignored networks must have already been checked. 6701553Srgrimes * Take a hint about for a good network. 6711553Srgrimes */ 6721553Srgrimesstatic void 6731553Srgrimespickslavenet(ntp) 6741553Srgrimes struct netinfo *ntp; 6751553Srgrimes{ 6761553Srgrimes if (slavenet != 0 && slavenet->status == SLAVE) { 6771553Srgrimes makeslave(slavenet); /* prune extras */ 6781553Srgrimes return; 6791553Srgrimes } 6801553Srgrimes 6811553Srgrimes if (ntp == 0 || ntp->status != SLAVE) { 6821553Srgrimes for (ntp = nettab; ntp != 0; ntp = ntp->next) { 6831553Srgrimes if (ntp->status == SLAVE) 6841553Srgrimes break; 6851553Srgrimes } 6861553Srgrimes } 6871553Srgrimes makeslave(ntp); 6881553Srgrimes} 6891553Srgrimes 6901553Srgrimes/* 6911553Srgrimes * returns a random number in the range [inf, sup] 6921553Srgrimes */ 6931553Srgrimeslong 6941553Srgrimescasual(inf, sup) 6951553Srgrimes long inf, sup; 6961553Srgrimes{ 6971553Srgrimes double value; 6981553Srgrimes 6991553Srgrimes value = ((double)(random() & 0x7fffffff)) / (0x7fffffff*1.0); 7001553Srgrimes return(inf + (sup - inf)*value); 7011553Srgrimes} 7021553Srgrimes 7031553Srgrimeschar * 7041553Srgrimesdate() 7051553Srgrimes{ 7061553Srgrimes struct timeval tv; 70737268Sbde time_t tv_sec; 7081553Srgrimes 7091553Srgrimes (void)gettimeofday(&tv, (struct timezone *)0); 71037268Sbde tv_sec = tv.tv_sec; 71137268Sbde return (ctime(&tv_sec)); 7121553Srgrimes} 7131553Srgrimes 7141553Srgrimesvoid 7151553Srgrimesaddnetname(name) 7161553Srgrimes char *name; 7171553Srgrimes{ 7181553Srgrimes register struct nets **netlist = &nets; 7191553Srgrimes 7201553Srgrimes while (*netlist) 7211553Srgrimes netlist = &((*netlist)->next); 7221553Srgrimes *netlist = (struct nets *)malloc(sizeof **netlist); 72330642Scharnier if (*netlist == 0) 72430642Scharnier errx(1, "malloc failed"); 7251553Srgrimes bzero((char *)*netlist, sizeof(**netlist)); 7261553Srgrimes (*netlist)->name = name; 7271553Srgrimes} 7281553Srgrimes 7291553Srgrimes/* note a host as trustworthy */ 7301553Srgrimesstatic void 7311553Srgrimesadd_good_host(name, perm) 7321553Srgrimes char *name; 7331553Srgrimes int perm; /* 1=not part of the netgroup */ 7341553Srgrimes{ 7351553Srgrimes register struct goodhost *ghp; 7361553Srgrimes register struct hostent *hentp; 7371553Srgrimes 7381553Srgrimes ghp = (struct goodhost*)malloc(sizeof(*ghp)); 7391553Srgrimes if (!ghp) { 7401553Srgrimes syslog(LOG_ERR, "malloc failed"); 7411553Srgrimes exit(1); 7421553Srgrimes } 7431553Srgrimes 7441553Srgrimes bzero((char*)ghp, sizeof(*ghp)); 7451553Srgrimes (void)strncpy(&ghp->name[0], name, sizeof(ghp->name)); 7461553Srgrimes ghp->next = goodhosts; 7471553Srgrimes ghp->perm = perm; 7481553Srgrimes goodhosts = ghp; 7491553Srgrimes 7501553Srgrimes hentp = gethostbyname(name); 7511553Srgrimes if (0 == hentp && perm) 75230642Scharnier warnx("unknown host %s", name); 7531553Srgrimes} 7541553Srgrimes 7551553Srgrimes 7561553Srgrimes/* update our image of the net-group of trustworthy hosts 7571553Srgrimes */ 7581553Srgrimesvoid 7591553Srgrimesget_goodgroup(force) 7601553Srgrimes int force; 7611553Srgrimes{ 7621553Srgrimes# define NG_DELAY (30*60*CLK_TCK) /* 30 minutes */ 7631553Srgrimes static unsigned long last_update = -NG_DELAY; 7641553Srgrimes unsigned long new_update; 76530642Scharnier struct goodhost *ghp, **ghpp; 76630642Scharnier#ifdef HAVENIS 7671553Srgrimes struct hosttbl *htp; 7681553Srgrimes char *mach, *usr, *dom; 76930642Scharnier#endif /* HAVENIS */ 7701553Srgrimes struct tms tm; 7711553Srgrimes 7721553Srgrimes 7731553Srgrimes /* if no netgroup, then we are finished */ 7741553Srgrimes if (goodgroup == 0 || !Mflag) 7751553Srgrimes return; 7761553Srgrimes 7771553Srgrimes /* Do not chatter with the netgroup master too often. 7781553Srgrimes */ 7791553Srgrimes new_update = times(&tm); 7801553Srgrimes if (new_update < last_update + NG_DELAY 7811553Srgrimes && !force) 7821553Srgrimes return; 7831553Srgrimes last_update = new_update; 7841553Srgrimes 7851553Srgrimes /* forget the old temporary entries */ 7861553Srgrimes ghpp = &goodhosts; 7871553Srgrimes while (0 != (ghp = *ghpp)) { 7881553Srgrimes if (!ghp->perm) { 7891553Srgrimes *ghpp = ghp->next; 7901553Srgrimes free((char*)ghp); 7911553Srgrimes } else { 7921553Srgrimes ghpp = &ghp->next; 7931553Srgrimes } 7941553Srgrimes } 7951553Srgrimes 7961553Srgrimes#ifdef HAVENIS 7971553Srgrimes /* quit now if we are not one of the trusted masters 7981553Srgrimes */ 7991553Srgrimes if (!innetgr(goodgroup, &hostname[0], 0,0)) { 8001553Srgrimes if (trace) 8011553Srgrimes (void)fprintf(fd, "get_goodgroup: %s not in %s\n", 8021553Srgrimes &hostname[0], goodgroup); 8031553Srgrimes return; 8041553Srgrimes } 8051553Srgrimes if (trace) 8061553Srgrimes (void)fprintf(fd, "get_goodgroup: %s in %s\n", 8071553Srgrimes &hostname[0], goodgroup); 8081553Srgrimes 8091553Srgrimes /* mark the entire netgroup as trusted */ 8101553Srgrimes (void)setnetgrent(goodgroup); 8111553Srgrimes while (getnetgrent(&mach,&usr,&dom)) { 8121553Srgrimes if (0 != mach) 8131553Srgrimes add_good_host(mach,0); 8141553Srgrimes } 8151553Srgrimes (void)endnetgrent(); 8161553Srgrimes 8171553Srgrimes /* update list of slaves */ 8181553Srgrimes for (htp = self.l_fwd; htp != &self; htp = htp->l_fwd) { 8191553Srgrimes htp->good = good_host_name(&htp->name[0]); 8201553Srgrimes } 8211553Srgrimes#endif /* HAVENIS */ 8221553Srgrimes} 8231553Srgrimes 8241553Srgrimes 8251553Srgrimes/* see if a machine is trustworthy 8261553Srgrimes */ 8271553Srgrimesint /* 1=trust hp to change our date */ 8281553Srgrimesgood_host_name(name) 8291553Srgrimes char *name; 8301553Srgrimes{ 8311553Srgrimes register struct goodhost *ghp = goodhosts; 8321553Srgrimes register char c; 8331553Srgrimes 8341553Srgrimes if (!ghp || !Mflag) /* trust everyone if no one named */ 8351553Srgrimes return 1; 8361553Srgrimes 8371553Srgrimes c = *name; 8381553Srgrimes do { 8391553Srgrimes if (c == ghp->name[0] 8401553Srgrimes && !strcasecmp(name, ghp->name)) 8411553Srgrimes return 1; /* found him, so say so */ 8421553Srgrimes } while (0 != (ghp = ghp->next)); 8431553Srgrimes 8441553Srgrimes if (!strcasecmp(name,hostname)) /* trust ourself */ 8451553Srgrimes return 1; 8461553Srgrimes 8471553Srgrimes return 0; /* did not find him */ 8481553Srgrimes} 849