timed.c revision 239991
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: head/usr.sbin/timed/timed/timed.c 239991 2012-09-01 14:45:15Z ed $"); 44117278Scharnier 451553Srgrimes#include "globals.h" 461553Srgrimes#include <net/if.h> 471553Srgrimes#include <sys/file.h> 481553Srgrimes#include <sys/ioctl.h> 491553Srgrimes#include <setjmp.h> 501553Srgrimes#include "pathnames.h" 511553Srgrimes#include <math.h> 521553Srgrimes#include <sys/types.h> 531553Srgrimes#include <sys/times.h> 541553Srgrimes 551553Srgrimesint trace = 0; 561553Srgrimesint sock, sock_raw = -1; 571553Srgrimesint status = 0; 581553Srgrimesu_short sequence; /* sequence number */ 591553Srgrimeslong delay1; 601553Srgrimeslong delay2; 611553Srgrimes 621553Srgrimesint nslavenets; /* nets were I could be a slave */ 631553Srgrimesint nmasternets; /* nets were I could be a master */ 641553Srgrimesint nignorednets; /* ignored nets */ 651553Srgrimesint nnets; /* nets I am connected to */ 661553Srgrimes 671553SrgrimesFILE *fd; /* trace file FD */ 681553Srgrimes 691553Srgrimesjmp_buf jmpenv; 701553Srgrimes 711553Srgrimesstruct netinfo *nettab = 0; 721553Srgrimesstruct netinfo *slavenet; 731553Srgrimesint Mflag; 741553Srgrimesint justquit = 0; 751553Srgrimesint debug; 761553Srgrimes 771553Srgrimesstatic struct nets { 781553Srgrimes char *name; 791553Srgrimes long net; 801553Srgrimes struct nets *next; 811553Srgrimes} *nets = 0; 821553Srgrimes 831553Srgrimesstruct hosttbl hosttbl[NHOSTS+1]; /* known hosts */ 841553Srgrimes 851553Srgrimesstatic struct goodhost { /* hosts that we trust */ 8630872Scharnier char name[MAXHOSTNAMELEN]; 871553Srgrimes struct goodhost *next; 881553Srgrimes char perm; 891553Srgrimes} *goodhosts; 901553Srgrimes 911553Srgrimesstatic char *goodgroup; /* net group of trusted hosts */ 92117278Scharnierstatic void checkignorednets(void); 93117278Scharnierstatic void pickslavenet(struct netinfo *); 94117278Scharnierstatic void add_good_host(char *, int); 95117278Scharnierstatic void usage(void); 961553Srgrimes 971553Srgrimes/* 981553Srgrimes * The timedaemons synchronize the clocks of hosts in a local area network. 991553Srgrimes * One daemon runs as master, all the others as slaves. The master 1001553Srgrimes * performs the task of computing clock differences and sends correction 1011553Srgrimes * values to the slaves. 1021553Srgrimes * Slaves start an election to choose a new master when the latter disappears 1031553Srgrimes * because of a machine crash, network partition, or when killed. 1041553Srgrimes * A resolution protocol is used to kill all but one of the masters 1051553Srgrimes * that happen to exist in segments of a partitioned network when the 1061553Srgrimes * network partition is fixed. 1071553Srgrimes * 1081553Srgrimes * Authors: Riccardo Gusella & Stefano Zatti 1091553Srgrimes * 1101553Srgrimes * overhauled at Silicon Graphics 1111553Srgrimes */ 1121553Srgrimesint 1131553Srgrimesmain(argc, argv) 1141553Srgrimes int argc; 1151553Srgrimes char *argv[]; 1161553Srgrimes{ 1171553Srgrimes int on; 1181553Srgrimes int ret; 1191553Srgrimes int nflag, iflag; 1201553Srgrimes struct timeval ntime; 1211553Srgrimes struct servent *srvp; 1221553Srgrimes char buf[BUFSIZ], *cp, *cplim; 1231553Srgrimes struct ifconf ifc; 1241553Srgrimes struct ifreq ifreq, ifreqf, *ifr; 1251553Srgrimes register struct netinfo *ntp; 1261553Srgrimes struct netinfo *ntip; 1271553Srgrimes struct netinfo *savefromnet; 1281553Srgrimes struct netent *nentp; 1291553Srgrimes struct nets *nt; 1301553Srgrimes struct sockaddr_in server; 1311553Srgrimes u_short port; 132179485Simp int c; 1331553Srgrimes 1341553Srgrimes#ifdef lint 1351553Srgrimes ntip = NULL; 1361553Srgrimes#endif 1371553Srgrimes 1381553Srgrimes on = 1; 1391553Srgrimes nflag = OFF; 1401553Srgrimes iflag = OFF; 1411553Srgrimes 1421553Srgrimes 1431553Srgrimes opterr = 0; 14424428Simp while ((c = getopt(argc, argv, "Mtdn:i:F:G:P:")) != -1) { 1451553Srgrimes switch (c) { 1461553Srgrimes case 'M': 1471553Srgrimes Mflag = 1; 1481553Srgrimes break; 1491553Srgrimes 1501553Srgrimes case 't': 1511553Srgrimes trace = 1; 1521553Srgrimes break; 1531553Srgrimes 1541553Srgrimes case 'n': 1551553Srgrimes if (iflag) { 15630642Scharnier errx(1, "-i and -n make no sense together"); 1571553Srgrimes } else { 1581553Srgrimes nflag = ON; 1591553Srgrimes addnetname(optarg); 1601553Srgrimes } 1611553Srgrimes break; 1621553Srgrimes 1631553Srgrimes case 'i': 1641553Srgrimes if (nflag) { 16530642Scharnier errx(1, "-i and -n make no sense together"); 1661553Srgrimes } else { 1671553Srgrimes iflag = ON; 1681553Srgrimes addnetname(optarg); 1691553Srgrimes } 1701553Srgrimes break; 1711553Srgrimes 1721553Srgrimes case 'F': 1731553Srgrimes add_good_host(optarg,1); 1741553Srgrimes while (optind < argc && argv[optind][0] != '-') 1751553Srgrimes add_good_host(argv[optind++], 1); 1761553Srgrimes break; 1771553Srgrimes 1781553Srgrimes case 'd': 1791553Srgrimes debug = 1; 1801553Srgrimes break; 1811553Srgrimes case 'G': 18230642Scharnier if (goodgroup != 0) 18330642Scharnier errx(1, "only one net group"); 1841553Srgrimes goodgroup = optarg; 1851553Srgrimes break; 1861553Srgrimes 1871553Srgrimes default: 18830642Scharnier usage(); 1891553Srgrimes break; 1901553Srgrimes } 1911553Srgrimes } 19230642Scharnier if (optind < argc) 19330642Scharnier usage(); 1941553Srgrimes 1951553Srgrimes /* If we care about which machine is the master, then we must 1961553Srgrimes * be willing to be a master 1971553Srgrimes */ 1981553Srgrimes if (0 != goodgroup || 0 != goodhosts) 1991553Srgrimes Mflag = 1; 2001553Srgrimes 20130642Scharnier if (gethostname(hostname, sizeof(hostname) - 1) < 0) 20230642Scharnier err(1, "gethostname"); 2031553Srgrimes self.l_bak = &self; 2041553Srgrimes self.l_fwd = &self; 2051553Srgrimes self.h_bak = &self; 2061553Srgrimes self.h_fwd = &self; 2071553Srgrimes self.head = 1; 2081553Srgrimes self.good = 1; 2091553Srgrimes 2101553Srgrimes if (goodhosts != 0) /* trust ourself */ 2111553Srgrimes add_good_host(hostname,1); 2121553Srgrimes 2131553Srgrimes srvp = getservbyname("timed", "udp"); 21430642Scharnier if (srvp == 0) 215117278Scharnier errx(1, "timed/udp: unknown service"); 2161553Srgrimes port = srvp->s_port; 2178532Sdg bzero(&server, sizeof(struct sockaddr_in)); 2181553Srgrimes server.sin_port = srvp->s_port; 2191553Srgrimes server.sin_family = AF_INET; 2201553Srgrimes sock = socket(AF_INET, SOCK_DGRAM, 0); 22130642Scharnier if (sock < 0) 22230642Scharnier err(1, "socket"); 2231553Srgrimes if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&on, 22430642Scharnier sizeof(on)) < 0) 22530642Scharnier err(1, "setsockopt"); 2261553Srgrimes if (bind(sock, (struct sockaddr*)&server, sizeof(server))) { 2271553Srgrimes if (errno == EADDRINUSE) 22830642Scharnier warnx("time daemon already running"); 2291553Srgrimes else 23030642Scharnier warn("bind"); 2311553Srgrimes exit(1); 2321553Srgrimes } 2331553Srgrimes 2341553Srgrimes /* choose a unique seed for random number generation */ 235239991Sed (void)gettimeofday(&ntime, NULL); 2361553Srgrimes srandom(ntime.tv_sec + ntime.tv_usec); 2371553Srgrimes 2381553Srgrimes sequence = random(); /* initial seq number */ 2391553Srgrimes 2401553Srgrimes /* rounds kernel variable time to multiple of 5 ms. */ 2411553Srgrimes ntime.tv_sec = 0; 2421553Srgrimes ntime.tv_usec = -((ntime.tv_usec/1000) % 5) * 1000; 2431553Srgrimes (void)adjtime(&ntime, (struct timeval *)0); 2441553Srgrimes 2451553Srgrimes for (nt = nets; nt; nt = nt->next) { 2461553Srgrimes nentp = getnetbyname(nt->name); 2471553Srgrimes if (nentp == 0) { 2481553Srgrimes nt->net = inet_network(nt->name); 2491553Srgrimes if (nt->net != INADDR_NONE) 2501553Srgrimes nentp = getnetbyaddr(nt->net, AF_INET); 2511553Srgrimes } 2521553Srgrimes if (nentp != 0) { 2531553Srgrimes nt->net = nentp->n_net; 2541553Srgrimes } else if (nt->net == INADDR_NONE) { 25530642Scharnier errx(1, "unknown net %s", nt->name); 2561553Srgrimes } else if (nt->net == INADDR_ANY) { 25730642Scharnier errx(1, "bad net %s", nt->name); 2581553Srgrimes } else { 25930642Scharnier warnx("warning: %s unknown in /etc/networks", 2601553Srgrimes nt->name); 2611553Srgrimes } 2621553Srgrimes 2631553Srgrimes if (0 == (nt->net & 0xff000000)) 2641553Srgrimes nt->net <<= 8; 2651553Srgrimes if (0 == (nt->net & 0xff000000)) 2661553Srgrimes nt->net <<= 8; 2671553Srgrimes if (0 == (nt->net & 0xff000000)) 2681553Srgrimes nt->net <<= 8; 2691553Srgrimes } 2701553Srgrimes ifc.ifc_len = sizeof(buf); 2711553Srgrimes ifc.ifc_buf = buf; 27230642Scharnier if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) 27330642Scharnier err(1, "get interface configuration"); 2741553Srgrimes ntp = NULL; 2751553Srgrimes#define size(p) max((p).sa_len, sizeof(p)) 2761553Srgrimes cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */ 2771553Srgrimes for (cp = buf; cp < cplim; 2781553Srgrimes cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) { 2791553Srgrimes ifr = (struct ifreq *)cp; 2801553Srgrimes if (ifr->ifr_addr.sa_family != AF_INET) 2811553Srgrimes continue; 2821553Srgrimes if (!ntp) 2831553Srgrimes ntp = (struct netinfo*)malloc(sizeof(struct netinfo)); 2841553Srgrimes bzero(ntp,sizeof(*ntp)); 2851553Srgrimes ntp->my_addr=((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; 2861553Srgrimes ntp->status = NOMASTER; 2871553Srgrimes ifreq = *ifr; 2881553Srgrimes ifreqf = *ifr; 2891553Srgrimes 2901553Srgrimes if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreqf) < 0) { 29130642Scharnier warn("get interface flags"); 2921553Srgrimes continue; 2931553Srgrimes } 2941553Srgrimes if ((ifreqf.ifr_flags & IFF_UP) == 0) 2951553Srgrimes continue; 2961553Srgrimes if ((ifreqf.ifr_flags & IFF_BROADCAST) == 0 && 2971553Srgrimes (ifreqf.ifr_flags & IFF_POINTOPOINT) == 0) { 2981553Srgrimes continue; 2991553Srgrimes } 3001553Srgrimes 3011553Srgrimes 3021553Srgrimes if (ioctl(sock, SIOCGIFNETMASK, (char *)&ifreq) < 0) { 30330642Scharnier warn("get netmask"); 3041553Srgrimes continue; 3051553Srgrimes } 3061553Srgrimes ntp->mask = ((struct sockaddr_in *) 3071553Srgrimes &ifreq.ifr_addr)->sin_addr.s_addr; 3081553Srgrimes 3091553Srgrimes if (ifreqf.ifr_flags & IFF_BROADCAST) { 3101553Srgrimes if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) { 31130642Scharnier warn("get broadaddr"); 3121553Srgrimes continue; 3131553Srgrimes } 3141553Srgrimes ntp->dest_addr = *(struct sockaddr_in *)&ifreq.ifr_broadaddr; 3151553Srgrimes /* What if the broadcast address is all ones? 3161553Srgrimes * So we cannot just mask ntp->dest_addr. */ 3171553Srgrimes ntp->net = ntp->my_addr; 3181553Srgrimes ntp->net.s_addr &= ntp->mask; 3191553Srgrimes } else { 3201553Srgrimes if (ioctl(sock, SIOCGIFDSTADDR, 3211553Srgrimes (char *)&ifreq) < 0) { 32230642Scharnier warn("get destaddr"); 3231553Srgrimes continue; 3241553Srgrimes } 3251553Srgrimes ntp->dest_addr = *(struct sockaddr_in *)&ifreq.ifr_dstaddr; 3261553Srgrimes ntp->net = ntp->dest_addr.sin_addr; 3271553Srgrimes } 3281553Srgrimes 3291553Srgrimes ntp->dest_addr.sin_port = port; 3301553Srgrimes 3311553Srgrimes for (nt = nets; nt; nt = nt->next) { 33228547Sjlemon if (ntp->net.s_addr == htonl(nt->net)) 3331553Srgrimes break; 3341553Srgrimes } 33530642Scharnier if ((nflag && !nt) || (iflag && nt)) 3361553Srgrimes continue; 3371553Srgrimes 3381553Srgrimes ntp->next = NULL; 3391553Srgrimes if (nettab == NULL) { 3401553Srgrimes nettab = ntp; 3411553Srgrimes } else { 3421553Srgrimes ntip->next = ntp; 3431553Srgrimes } 3441553Srgrimes ntip = ntp; 3451553Srgrimes ntp = NULL; 3461553Srgrimes } 3471553Srgrimes if (ntp) 3481553Srgrimes (void) free((char *)ntp); 34930642Scharnier if (nettab == NULL) 35030642Scharnier errx(1, "no network usable"); 3511553Srgrimes 3521553Srgrimes /* microseconds to delay before responding to a broadcast */ 3531553Srgrimes delay1 = casual(1, 100*1000); 3541553Srgrimes 3551553Srgrimes /* election timer delay in secs. */ 3561553Srgrimes delay2 = casual(MINTOUT, MAXTOUT); 3571553Srgrimes 3581553Srgrimes if (!debug) 3591553Srgrimes daemon(debug, 0); 3601553Srgrimes 3611553Srgrimes if (trace) 3621553Srgrimes traceon(); 3631553Srgrimes openlog("timed", LOG_CONS|LOG_PID, LOG_DAEMON); 3641553Srgrimes 3651553Srgrimes /* 3661553Srgrimes * keep returning here 3671553Srgrimes */ 3681553Srgrimes ret = setjmp(jmpenv); 3691553Srgrimes savefromnet = fromnet; 3701553Srgrimes setstatus(); 3711553Srgrimes 3721553Srgrimes if (Mflag) { 3731553Srgrimes switch (ret) { 3741553Srgrimes 3751553Srgrimes case 0: 3761553Srgrimes checkignorednets(); 3771553Srgrimes pickslavenet(0); 3781553Srgrimes break; 3791553Srgrimes case 1: 3801553Srgrimes /* Just lost our master */ 3811553Srgrimes if (slavenet != 0) 3821553Srgrimes slavenet->status = election(slavenet); 3831553Srgrimes if (!slavenet || slavenet->status == MASTER) { 3841553Srgrimes checkignorednets(); 3851553Srgrimes pickslavenet(0); 3861553Srgrimes } else { 3871553Srgrimes makeslave(slavenet); /* prune extras */ 3881553Srgrimes } 3891553Srgrimes break; 3901553Srgrimes 3911553Srgrimes case 2: 3921553Srgrimes /* Just been told to quit */ 3931553Srgrimes justquit = 1; 3941553Srgrimes pickslavenet(savefromnet); 3951553Srgrimes break; 3961553Srgrimes } 3971553Srgrimes 3981553Srgrimes setstatus(); 3991553Srgrimes if (!(status & MASTER) && sock_raw != -1) { 4001553Srgrimes /* sock_raw is not being used now */ 4011553Srgrimes (void)close(sock_raw); 4021553Srgrimes sock_raw = -1; 4031553Srgrimes } 4041553Srgrimes 4051553Srgrimes if (status == MASTER) 4061553Srgrimes master(); 4071553Srgrimes else 4081553Srgrimes slave(); 4091553Srgrimes 4101553Srgrimes } else { 4111553Srgrimes if (sock_raw != -1) { 4121553Srgrimes (void)close(sock_raw); 4131553Srgrimes sock_raw = -1; 4141553Srgrimes } 4151553Srgrimes 4161553Srgrimes if (ret) { 4171553Srgrimes /* we just lost our master or were told to quit */ 4181553Srgrimes justquit = 1; 4191553Srgrimes } 4201553Srgrimes for (ntp = nettab; ntp != NULL; ntp = ntp->next) { 4211553Srgrimes if (ntp->status == MASTER) 4221553Srgrimes rmnetmachs(ntp); 4231553Srgrimes ntp->status = NOMASTER; 4241553Srgrimes } 4251553Srgrimes checkignorednets(); 4261553Srgrimes pickslavenet(0); 4271553Srgrimes setstatus(); 4281553Srgrimes 4291553Srgrimes slave(); 4301553Srgrimes } 4311553Srgrimes /* NOTREACHED */ 4321553Srgrimes return(0); 4331553Srgrimes} 4341553Srgrimes 43530642Scharnierstatic void 43630642Scharnierusage() 43730642Scharnier{ 43830642Scharnier#ifdef HAVENIS 43930642Scharnier fprintf(stderr, 44030642Scharnier"usage: timed [-dtM] [-i net|-n net] [-F host1 host2 ...] [-G netgp]\n"); 44130642Scharnier#else 44230642Scharnier fprintf(stderr, 44330642Scharnier"usage: timed [-dtM] [-i net|-n net] [-F host1 host2 ...]\n"); 44430642Scharnier#endif /* HAVENIS */ 44530642Scharnier exit(1); 44630642Scharnier} 44730642Scharnier 4481553Srgrimes/* 4491553Srgrimes * suppress an upstart, untrustworthy, self-appointed master 4501553Srgrimes */ 4511553Srgrimesvoid 4521553Srgrimessuppress(addr, name,net) 4531553Srgrimes struct sockaddr_in *addr; 4541553Srgrimes char *name; 4551553Srgrimes struct netinfo *net; 4561553Srgrimes{ 4571553Srgrimes struct sockaddr_in tgt; 4581553Srgrimes char tname[MAXHOSTNAMELEN]; 4591553Srgrimes struct tsp msg; 4601553Srgrimes static struct timeval wait; 4611553Srgrimes 4621553Srgrimes if (trace) 4631553Srgrimes fprintf(fd, "suppress: %s\n", name); 4641553Srgrimes tgt = *addr; 46530830Scharnier (void)strcpy(tname, name); 4661553Srgrimes 4671553Srgrimes while (0 != readmsg(TSP_ANY, ANYADDR, &wait, net)) { 4681553Srgrimes if (trace) 4691553Srgrimes fprintf(fd, "suppress:\tdiscarded packet from %s\n", 4701553Srgrimes name); 4711553Srgrimes } 4721553Srgrimes 4731553Srgrimes syslog(LOG_NOTICE, "suppressing false master %s", tname); 4741553Srgrimes msg.tsp_type = TSP_QUIT; 47530830Scharnier (void)strcpy(msg.tsp_name, hostname); 4761553Srgrimes (void)acksend(&msg, &tgt, tname, TSP_ACK, 0, 1); 4771553Srgrimes} 4781553Srgrimes 4791553Srgrimesvoid 4801553Srgrimeslookformaster(ntp) 4811553Srgrimes struct netinfo *ntp; 4821553Srgrimes{ 4831553Srgrimes struct tsp resp, conflict, *answer; 4841553Srgrimes struct timeval ntime; 4851553Srgrimes char mastername[MAXHOSTNAMELEN]; 4861553Srgrimes struct sockaddr_in masteraddr; 4871553Srgrimes 4881553Srgrimes get_goodgroup(0); 4891553Srgrimes ntp->status = SLAVE; 4901553Srgrimes 4911553Srgrimes /* look for master */ 4921553Srgrimes resp.tsp_type = TSP_MASTERREQ; 49330830Scharnier (void)strcpy(resp.tsp_name, hostname); 4941553Srgrimes answer = acksend(&resp, &ntp->dest_addr, ANYADDR, 4951553Srgrimes TSP_MASTERACK, ntp, 0); 4961553Srgrimes if (answer != 0 && !good_host_name(answer->tsp_name)) { 4971553Srgrimes suppress(&from, answer->tsp_name, ntp); 4981553Srgrimes ntp->status = NOMASTER; 4991553Srgrimes answer = 0; 5001553Srgrimes } 5011553Srgrimes if (answer == 0) { 5021553Srgrimes /* 5031553Srgrimes * Various conditions can cause conflict: races between 5041553Srgrimes * two just started timedaemons when no master is 5051553Srgrimes * present, or timedaemons started during an election. 5061553Srgrimes * A conservative approach is taken. Give up and became a 5071553Srgrimes * slave, postponing election of a master until first 5081553Srgrimes * timer expires. 5091553Srgrimes */ 5101553Srgrimes ntime.tv_sec = ntime.tv_usec = 0; 5111553Srgrimes answer = readmsg(TSP_MASTERREQ, ANYADDR, &ntime, ntp); 5121553Srgrimes if (answer != 0) { 5131553Srgrimes if (!good_host_name(answer->tsp_name)) { 5141553Srgrimes suppress(&from, answer->tsp_name, ntp); 5151553Srgrimes ntp->status = NOMASTER; 5161553Srgrimes } 5171553Srgrimes return; 5181553Srgrimes } 5191553Srgrimes 5201553Srgrimes ntime.tv_sec = ntime.tv_usec = 0; 5211553Srgrimes answer = readmsg(TSP_MASTERUP, ANYADDR, &ntime, ntp); 5221553Srgrimes if (answer != 0) { 5231553Srgrimes if (!good_host_name(answer->tsp_name)) { 5241553Srgrimes suppress(&from, answer->tsp_name, ntp); 5251553Srgrimes ntp->status = NOMASTER; 5261553Srgrimes } 5271553Srgrimes return; 5281553Srgrimes } 5291553Srgrimes 5301553Srgrimes ntime.tv_sec = ntime.tv_usec = 0; 5311553Srgrimes answer = readmsg(TSP_ELECTION, ANYADDR, &ntime, ntp); 5321553Srgrimes if (answer != 0) { 5331553Srgrimes if (!good_host_name(answer->tsp_name)) { 5341553Srgrimes suppress(&from, answer->tsp_name, ntp); 5351553Srgrimes ntp->status = NOMASTER; 5361553Srgrimes } 5371553Srgrimes return; 5381553Srgrimes } 5391553Srgrimes 5401553Srgrimes if (Mflag) 5411553Srgrimes ntp->status = MASTER; 5421553Srgrimes else 5431553Srgrimes ntp->status = NOMASTER; 5441553Srgrimes return; 5451553Srgrimes } 5461553Srgrimes 5471553Srgrimes ntp->status = SLAVE; 54830830Scharnier (void)strcpy(mastername, answer->tsp_name); 5491553Srgrimes masteraddr = from; 5501553Srgrimes 5511553Srgrimes /* 5521553Srgrimes * If network has been partitioned, there might be other 5531553Srgrimes * masters; tell the one we have just acknowledged that 5541553Srgrimes * it has to gain control over the others. 5551553Srgrimes */ 5561553Srgrimes ntime.tv_sec = 0; 5571553Srgrimes ntime.tv_usec = 300000; 5581553Srgrimes answer = readmsg(TSP_MASTERACK, ANYADDR, &ntime, ntp); 5591553Srgrimes /* 5601553Srgrimes * checking also not to send CONFLICT to ack'ed master 5611553Srgrimes * due to duplicated MASTERACKs 5621553Srgrimes */ 5631553Srgrimes if (answer != NULL && 5641553Srgrimes strcmp(answer->tsp_name, mastername) != 0) { 5651553Srgrimes conflict.tsp_type = TSP_CONFLICT; 56630830Scharnier (void)strcpy(conflict.tsp_name, hostname); 5671553Srgrimes if (!acksend(&conflict, &masteraddr, mastername, 5681553Srgrimes TSP_ACK, 0, 0)) { 5691553Srgrimes syslog(LOG_ERR, 5701553Srgrimes "error on sending TSP_CONFLICT"); 5711553Srgrimes } 5721553Srgrimes } 5731553Srgrimes} 5741553Srgrimes 5751553Srgrimes/* 5761553Srgrimes * based on the current network configuration, set the status, and count 5771553Srgrimes * networks; 5781553Srgrimes */ 5791553Srgrimesvoid 5801553Srgrimessetstatus() 5811553Srgrimes{ 5821553Srgrimes struct netinfo *ntp; 5831553Srgrimes 5841553Srgrimes status = 0; 5851553Srgrimes nmasternets = nslavenets = nnets = nignorednets = 0; 5861553Srgrimes if (trace) 5871553Srgrimes fprintf(fd, "Net status:\n"); 5881553Srgrimes for (ntp = nettab; ntp != NULL; ntp = ntp->next) { 5891553Srgrimes switch ((int)ntp->status) { 5901553Srgrimes case MASTER: 5911553Srgrimes nmasternets++; 5921553Srgrimes break; 5931553Srgrimes case SLAVE: 5941553Srgrimes nslavenets++; 5951553Srgrimes break; 5961553Srgrimes case NOMASTER: 5971553Srgrimes case IGNORE: 5981553Srgrimes nignorednets++; 5991553Srgrimes break; 6001553Srgrimes } 6011553Srgrimes if (trace) { 6021553Srgrimes fprintf(fd, "\t%-16s", inet_ntoa(ntp->net)); 6031553Srgrimes switch ((int)ntp->status) { 6041553Srgrimes case NOMASTER: 6051553Srgrimes fprintf(fd, "NOMASTER\n"); 6061553Srgrimes break; 6071553Srgrimes case MASTER: 6081553Srgrimes fprintf(fd, "MASTER\n"); 6091553Srgrimes break; 6101553Srgrimes case SLAVE: 6111553Srgrimes fprintf(fd, "SLAVE\n"); 6121553Srgrimes break; 6131553Srgrimes case IGNORE: 6141553Srgrimes fprintf(fd, "IGNORE\n"); 6151553Srgrimes break; 6161553Srgrimes default: 6171553Srgrimes fprintf(fd, "invalid state %d\n", 6181553Srgrimes (int)ntp->status); 6191553Srgrimes break; 6201553Srgrimes } 6211553Srgrimes } 6221553Srgrimes nnets++; 6231553Srgrimes status |= ntp->status; 6241553Srgrimes } 6251553Srgrimes status &= ~IGNORE; 6261553Srgrimes if (trace) 6271553Srgrimes fprintf(fd, 62837268Sbde "\tnets=%d masters=%d slaves=%d ignored=%d delay2=%ld\n", 62937268Sbde nnets, nmasternets, nslavenets, nignorednets, delay2); 6301553Srgrimes} 6311553Srgrimes 6321553Srgrimesvoid 6331553Srgrimesmakeslave(net) 6341553Srgrimes struct netinfo *net; 6351553Srgrimes{ 6361553Srgrimes register struct netinfo *ntp; 6371553Srgrimes 6381553Srgrimes for (ntp = nettab; ntp != NULL; ntp = ntp->next) { 6391553Srgrimes if (ntp->status == SLAVE && ntp != net) 6401553Srgrimes ntp->status = IGNORE; 6411553Srgrimes } 6421553Srgrimes slavenet = net; 6431553Srgrimes} 6441553Srgrimes 6451553Srgrimes/* 6461553Srgrimes * Try to become master over ignored nets.. 6471553Srgrimes */ 6481553Srgrimesstatic void 6491553Srgrimescheckignorednets() 6501553Srgrimes{ 6511553Srgrimes register struct netinfo *ntp; 6521553Srgrimes 6531553Srgrimes for (ntp = nettab; ntp != NULL; ntp = ntp->next) { 6541553Srgrimes if (!Mflag && ntp->status == SLAVE) 6551553Srgrimes break; 6561553Srgrimes 6571553Srgrimes if (ntp->status == IGNORE || ntp->status == NOMASTER) { 6581553Srgrimes lookformaster(ntp); 6591553Srgrimes if (!Mflag && ntp->status == SLAVE) 6601553Srgrimes break; 6611553Srgrimes } 6621553Srgrimes } 6631553Srgrimes} 6641553Srgrimes 6651553Srgrimes/* 6661553Srgrimes * choose a good network on which to be a slave 6671553Srgrimes * The ignored networks must have already been checked. 6681553Srgrimes * Take a hint about for a good network. 6691553Srgrimes */ 6701553Srgrimesstatic void 6711553Srgrimespickslavenet(ntp) 6721553Srgrimes struct netinfo *ntp; 6731553Srgrimes{ 6741553Srgrimes if (slavenet != 0 && slavenet->status == SLAVE) { 6751553Srgrimes makeslave(slavenet); /* prune extras */ 6761553Srgrimes return; 6771553Srgrimes } 6781553Srgrimes 6791553Srgrimes if (ntp == 0 || ntp->status != SLAVE) { 6801553Srgrimes for (ntp = nettab; ntp != 0; ntp = ntp->next) { 6811553Srgrimes if (ntp->status == SLAVE) 6821553Srgrimes break; 6831553Srgrimes } 6841553Srgrimes } 6851553Srgrimes makeslave(ntp); 6861553Srgrimes} 6871553Srgrimes 6881553Srgrimes/* 6891553Srgrimes * returns a random number in the range [inf, sup] 6901553Srgrimes */ 6911553Srgrimeslong 6921553Srgrimescasual(inf, sup) 6931553Srgrimes long inf, sup; 6941553Srgrimes{ 6951553Srgrimes double value; 6961553Srgrimes 6971553Srgrimes value = ((double)(random() & 0x7fffffff)) / (0x7fffffff*1.0); 6981553Srgrimes return(inf + (sup - inf)*value); 6991553Srgrimes} 7001553Srgrimes 7011553Srgrimeschar * 7021553Srgrimesdate() 7031553Srgrimes{ 70437268Sbde time_t tv_sec; 7051553Srgrimes 706239991Sed tv_sec = time(NULL); 70737268Sbde return (ctime(&tv_sec)); 7081553Srgrimes} 7091553Srgrimes 7101553Srgrimesvoid 7111553Srgrimesaddnetname(name) 7121553Srgrimes char *name; 7131553Srgrimes{ 7141553Srgrimes register struct nets **netlist = &nets; 7151553Srgrimes 7161553Srgrimes while (*netlist) 7171553Srgrimes netlist = &((*netlist)->next); 7181553Srgrimes *netlist = (struct nets *)malloc(sizeof **netlist); 71930642Scharnier if (*netlist == 0) 72030642Scharnier errx(1, "malloc failed"); 7211553Srgrimes bzero((char *)*netlist, sizeof(**netlist)); 7221553Srgrimes (*netlist)->name = name; 7231553Srgrimes} 7241553Srgrimes 7251553Srgrimes/* note a host as trustworthy */ 7261553Srgrimesstatic void 7271553Srgrimesadd_good_host(name, perm) 7281553Srgrimes char *name; 7291553Srgrimes int perm; /* 1=not part of the netgroup */ 7301553Srgrimes{ 7311553Srgrimes register struct goodhost *ghp; 7321553Srgrimes register struct hostent *hentp; 7331553Srgrimes 7341553Srgrimes ghp = (struct goodhost*)malloc(sizeof(*ghp)); 7351553Srgrimes if (!ghp) { 7361553Srgrimes syslog(LOG_ERR, "malloc failed"); 7371553Srgrimes exit(1); 7381553Srgrimes } 7391553Srgrimes 7401553Srgrimes bzero((char*)ghp, sizeof(*ghp)); 7411553Srgrimes (void)strncpy(&ghp->name[0], name, sizeof(ghp->name)); 7421553Srgrimes ghp->next = goodhosts; 7431553Srgrimes ghp->perm = perm; 7441553Srgrimes goodhosts = ghp; 7451553Srgrimes 7461553Srgrimes hentp = gethostbyname(name); 7471553Srgrimes if (0 == hentp && perm) 74830642Scharnier warnx("unknown host %s", name); 7491553Srgrimes} 7501553Srgrimes 7511553Srgrimes 7521553Srgrimes/* update our image of the net-group of trustworthy hosts 7531553Srgrimes */ 7541553Srgrimesvoid 7551553Srgrimesget_goodgroup(force) 7561553Srgrimes int force; 7571553Srgrimes{ 7581553Srgrimes# define NG_DELAY (30*60*CLK_TCK) /* 30 minutes */ 7591553Srgrimes static unsigned long last_update = -NG_DELAY; 7601553Srgrimes unsigned long new_update; 76130642Scharnier struct goodhost *ghp, **ghpp; 76230642Scharnier#ifdef HAVENIS 7631553Srgrimes struct hosttbl *htp; 7641553Srgrimes char *mach, *usr, *dom; 76530642Scharnier#endif /* HAVENIS */ 7661553Srgrimes struct tms tm; 7671553Srgrimes 7681553Srgrimes 7691553Srgrimes /* if no netgroup, then we are finished */ 7701553Srgrimes if (goodgroup == 0 || !Mflag) 7711553Srgrimes return; 7721553Srgrimes 7731553Srgrimes /* Do not chatter with the netgroup master too often. 7741553Srgrimes */ 7751553Srgrimes new_update = times(&tm); 7761553Srgrimes if (new_update < last_update + NG_DELAY 7771553Srgrimes && !force) 7781553Srgrimes return; 7791553Srgrimes last_update = new_update; 7801553Srgrimes 7811553Srgrimes /* forget the old temporary entries */ 7821553Srgrimes ghpp = &goodhosts; 7831553Srgrimes while (0 != (ghp = *ghpp)) { 7841553Srgrimes if (!ghp->perm) { 7851553Srgrimes *ghpp = ghp->next; 7861553Srgrimes free((char*)ghp); 7871553Srgrimes } else { 7881553Srgrimes ghpp = &ghp->next; 7891553Srgrimes } 7901553Srgrimes } 7911553Srgrimes 7921553Srgrimes#ifdef HAVENIS 7931553Srgrimes /* quit now if we are not one of the trusted masters 7941553Srgrimes */ 7951553Srgrimes if (!innetgr(goodgroup, &hostname[0], 0,0)) { 7961553Srgrimes if (trace) 7971553Srgrimes (void)fprintf(fd, "get_goodgroup: %s not in %s\n", 7981553Srgrimes &hostname[0], goodgroup); 7991553Srgrimes return; 8001553Srgrimes } 8011553Srgrimes if (trace) 8021553Srgrimes (void)fprintf(fd, "get_goodgroup: %s in %s\n", 8031553Srgrimes &hostname[0], goodgroup); 8041553Srgrimes 8051553Srgrimes /* mark the entire netgroup as trusted */ 8061553Srgrimes (void)setnetgrent(goodgroup); 8071553Srgrimes while (getnetgrent(&mach,&usr,&dom)) { 8081553Srgrimes if (0 != mach) 8091553Srgrimes add_good_host(mach,0); 8101553Srgrimes } 8111553Srgrimes (void)endnetgrent(); 8121553Srgrimes 8131553Srgrimes /* update list of slaves */ 8141553Srgrimes for (htp = self.l_fwd; htp != &self; htp = htp->l_fwd) { 8151553Srgrimes htp->good = good_host_name(&htp->name[0]); 8161553Srgrimes } 8171553Srgrimes#endif /* HAVENIS */ 8181553Srgrimes} 8191553Srgrimes 8201553Srgrimes 8211553Srgrimes/* see if a machine is trustworthy 8221553Srgrimes */ 8231553Srgrimesint /* 1=trust hp to change our date */ 8241553Srgrimesgood_host_name(name) 8251553Srgrimes char *name; 8261553Srgrimes{ 8271553Srgrimes register struct goodhost *ghp = goodhosts; 8281553Srgrimes register char c; 8291553Srgrimes 8301553Srgrimes if (!ghp || !Mflag) /* trust everyone if no one named */ 8311553Srgrimes return 1; 8321553Srgrimes 8331553Srgrimes c = *name; 8341553Srgrimes do { 8351553Srgrimes if (c == ghp->name[0] 8361553Srgrimes && !strcasecmp(name, ghp->name)) 8371553Srgrimes return 1; /* found him, so say so */ 8381553Srgrimes } while (0 != (ghp = ghp->next)); 8391553Srgrimes 8401553Srgrimes if (!strcasecmp(name,hostname)) /* trust ourself */ 8411553Srgrimes return 1; 8421553Srgrimes 8431553Srgrimes return 0; /* did not find him */ 8441553Srgrimes} 845