slave.c revision 1553
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 351553Srgrimesstatic char sccsid[] = "@(#)slave.c 8.1 (Berkeley) 6/6/93"; 361553Srgrimes#endif /* not lint */ 371553Srgrimes 381553Srgrimes#ifdef sgi 391553Srgrimes#ident "$Revision: 1.20 $" 401553Srgrimes#endif 411553Srgrimes 421553Srgrimes#include "globals.h" 431553Srgrimes#include <setjmp.h> 441553Srgrimes#include "pathnames.h" 451553Srgrimes 461553Srgrimesextern jmp_buf jmpenv; 471553Srgrimesextern int Mflag; 481553Srgrimesextern int justquit; 491553Srgrimes 501553Srgrimesextern u_short sequence; 511553Srgrimes 521553Srgrimesstatic char master_name[MAXHOSTNAMELEN+1]; 531553Srgrimesstatic struct netinfo *old_slavenet; 541553Srgrimesstatic int old_status; 551553Srgrimes 561553Srgrimesstatic void schgdate __P((struct tsp *, char *)); 571553Srgrimesstatic void setmaster __P((struct tsp *)); 581553Srgrimesstatic void answerdelay __P((void)); 591553Srgrimes 601553Srgrimes#ifdef sgi 611553Srgrimesextern void logwtmp __P((struct timeval *, struct timeval *)); 621553Srgrimes#else 631553Srgrimesextern void logwtmp __P((char *, char *, char *)); 641553Srgrimes#endif /* sgi */ 651553Srgrimes 661553Srgrimesint 671553Srgrimesslave() 681553Srgrimes{ 691553Srgrimes int tries; 701553Srgrimes long electiontime, refusetime, looktime, looptime, adjtime; 711553Srgrimes u_short seq; 721553Srgrimes long fastelection; 731553Srgrimes#define FASTTOUT 3 741553Srgrimes struct in_addr cadr; 751553Srgrimes struct timeval otime; 761553Srgrimes struct sockaddr_in taddr; 771553Srgrimes char tname[MAXHOSTNAMELEN]; 781553Srgrimes struct tsp *msg, to; 791553Srgrimes struct timeval ntime, wait; 801553Srgrimes struct tsp *answer; 811553Srgrimes int timeout(); 821553Srgrimes char olddate[32]; 831553Srgrimes char newdate[32]; 841553Srgrimes struct netinfo *ntp; 851553Srgrimes struct hosttbl *htp; 861553Srgrimes 871553Srgrimes 881553Srgrimes old_slavenet = 0; 891553Srgrimes seq = 0; 901553Srgrimes refusetime = 0; 911553Srgrimes adjtime = 0; 921553Srgrimes 931553Srgrimes (void)gettimeofday(&ntime, 0); 941553Srgrimes electiontime = ntime.tv_sec + delay2; 951553Srgrimes fastelection = ntime.tv_sec + FASTTOUT; 961553Srgrimes if (justquit) 971553Srgrimes looktime = electiontime; 981553Srgrimes else 991553Srgrimes looktime = fastelection; 1001553Srgrimes looptime = fastelection; 1011553Srgrimes 1021553Srgrimes if (slavenet) 1031553Srgrimes xmit(TSP_SLAVEUP, 0, &slavenet->dest_addr); 1041553Srgrimes if (status & MASTER) { 1051553Srgrimes for (ntp = nettab; ntp != NULL; ntp = ntp->next) { 1061553Srgrimes if (ntp->status == MASTER) 1071553Srgrimes masterup(ntp); 1081553Srgrimes } 1091553Srgrimes } 1101553Srgrimes 1111553Srgrimesloop: 1121553Srgrimes get_goodgroup(0); 1131553Srgrimes (void)gettimeofday(&ntime, (struct timezone *)0); 1141553Srgrimes if (ntime.tv_sec > electiontime) { 1151553Srgrimes if (trace) 1161553Srgrimes fprintf(fd, "election timer expired\n"); 1171553Srgrimes longjmp(jmpenv, 1); 1181553Srgrimes } 1191553Srgrimes 1201553Srgrimes if (ntime.tv_sec >= looktime) { 1211553Srgrimes if (trace) 1221553Srgrimes fprintf(fd, "Looking for nets to master\n"); 1231553Srgrimes 1241553Srgrimes if (Mflag && nignorednets > 0) { 1251553Srgrimes for (ntp = nettab; ntp != NULL; ntp = ntp->next) { 1261553Srgrimes if (ntp->status == IGNORE 1271553Srgrimes || ntp->status == NOMASTER) { 1281553Srgrimes lookformaster(ntp); 1291553Srgrimes if (ntp->status == MASTER) { 1301553Srgrimes masterup(ntp); 1311553Srgrimes } else if (ntp->status == MASTER) { 1321553Srgrimes ntp->status = NOMASTER; 1331553Srgrimes } 1341553Srgrimes } 1351553Srgrimes if (ntp->status == MASTER 1361553Srgrimes && --ntp->quit_count < 0) 1371553Srgrimes ntp->quit_count = 0; 1381553Srgrimes } 1391553Srgrimes makeslave(slavenet); /* prune extras */ 1401553Srgrimes setstatus(); 1411553Srgrimes } 1421553Srgrimes (void)gettimeofday(&ntime, 0); 1431553Srgrimes looktime = ntime.tv_sec + delay2; 1441553Srgrimes } 1451553Srgrimes if (ntime.tv_sec >= looptime) { 1461553Srgrimes if (trace) 1471553Srgrimes fprintf(fd, "Looking for loops\n"); 1481553Srgrimes for (ntp = nettab; ntp != NULL; ntp = ntp->next) { 1491553Srgrimes if (ntp->status == MASTER) { 1501553Srgrimes to.tsp_type = TSP_LOOP; 1511553Srgrimes to.tsp_vers = TSPVERSION; 1521553Srgrimes to.tsp_seq = sequence++; 1531553Srgrimes to.tsp_hopcnt = MAX_HOPCNT; 1541553Srgrimes (void)strcpy(to.tsp_name, hostname); 1551553Srgrimes bytenetorder(&to); 1561553Srgrimes if (sendto(sock, (char *)&to, sizeof(struct tsp), 0, 1571553Srgrimes (struct sockaddr*)&ntp->dest_addr, 1581553Srgrimes sizeof(ntp->dest_addr)) < 0) { 1591553Srgrimes trace_sendto_err(ntp->dest_addr.sin_addr); 1601553Srgrimes } 1611553Srgrimes } 1621553Srgrimes } 1631553Srgrimes (void)gettimeofday(&ntime, 0); 1641553Srgrimes looptime = ntime.tv_sec + delay2; 1651553Srgrimes } 1661553Srgrimes 1671553Srgrimes wait.tv_sec = min(electiontime,min(looktime,looptime)) - ntime.tv_sec; 1681553Srgrimes if (wait.tv_sec < 0) 1691553Srgrimes wait.tv_sec = 0; 1701553Srgrimes wait.tv_sec += FASTTOUT; 1711553Srgrimes wait.tv_usec = 0; 1721553Srgrimes msg = readmsg(TSP_ANY, ANYADDR, &wait, 0); 1731553Srgrimes 1741553Srgrimes if (msg != NULL) { 1751553Srgrimes /* 1761553Srgrimes * filter stuff not for us 1771553Srgrimes */ 1781553Srgrimes switch (msg->tsp_type) { 1791553Srgrimes case TSP_SETDATE: 1801553Srgrimes case TSP_TRACEOFF: 1811553Srgrimes case TSP_TRACEON: 1821553Srgrimes /* 1831553Srgrimes * XXX check to see they are from ourself 1841553Srgrimes */ 1851553Srgrimes break; 1861553Srgrimes 1871553Srgrimes case TSP_TEST: 1881553Srgrimes case TSP_MSITE: 1891553Srgrimes break; 1901553Srgrimes 1911553Srgrimes case TSP_MASTERUP: 1921553Srgrimes if (!fromnet) { 1931553Srgrimes if (trace) { 1941553Srgrimes fprintf(fd, "slave ignored: "); 1951553Srgrimes print(msg, &from); 1961553Srgrimes } 1971553Srgrimes goto loop; 1981553Srgrimes } 1991553Srgrimes break; 2001553Srgrimes 2011553Srgrimes default: 2021553Srgrimes if (!fromnet 2031553Srgrimes || fromnet->status == IGNORE 2041553Srgrimes || fromnet->status == NOMASTER) { 2051553Srgrimes if (trace) { 2061553Srgrimes fprintf(fd, "slave ignored: "); 2071553Srgrimes print(msg, &from); 2081553Srgrimes } 2091553Srgrimes goto loop; 2101553Srgrimes } 2111553Srgrimes break; 2121553Srgrimes } 2131553Srgrimes 2141553Srgrimes 2151553Srgrimes /* 2161553Srgrimes * now process the message 2171553Srgrimes */ 2181553Srgrimes switch (msg->tsp_type) { 2191553Srgrimes 2201553Srgrimes case TSP_ADJTIME: 2211553Srgrimes if (fromnet != slavenet) 2221553Srgrimes break; 2231553Srgrimes if (!good_host_name(msg->tsp_name)) { 2241553Srgrimes syslog(LOG_NOTICE, 2251553Srgrimes "attempted time adjustment by %s", 2261553Srgrimes msg->tsp_name); 2271553Srgrimes suppress(&from, msg->tsp_name, fromnet); 2281553Srgrimes break; 2291553Srgrimes } 2301553Srgrimes /* 2311553Srgrimes * Speed up loop detection in case we have a loop. 2321553Srgrimes * Otherwise the clocks can race until the loop 2331553Srgrimes * is found. 2341553Srgrimes */ 2351553Srgrimes (void)gettimeofday(&otime, 0); 2361553Srgrimes if (adjtime < otime.tv_sec) 2371553Srgrimes looptime -= (looptime-otime.tv_sec)/2 + 1; 2381553Srgrimes 2391553Srgrimes setmaster(msg); 2401553Srgrimes if (seq != msg->tsp_seq) { 2411553Srgrimes seq = msg->tsp_seq; 2421553Srgrimes synch(tvtomsround(msg->tsp_time)); 2431553Srgrimes } 2441553Srgrimes (void)gettimeofday(&ntime, 0); 2451553Srgrimes electiontime = ntime.tv_sec + delay2; 2461553Srgrimes fastelection = ntime.tv_sec + FASTTOUT; 2471553Srgrimes adjtime = ntime.tv_sec + SAMPLEINTVL*2; 2481553Srgrimes break; 2491553Srgrimes 2501553Srgrimes case TSP_SETTIME: 2511553Srgrimes if (fromnet != slavenet) 2521553Srgrimes break; 2531553Srgrimes if (seq == msg->tsp_seq) 2541553Srgrimes break; 2551553Srgrimes seq = msg->tsp_seq; 2561553Srgrimes 2571553Srgrimes /* adjust time for residence on the queue */ 2581553Srgrimes (void)gettimeofday(&otime, 0); 2591553Srgrimes adj_msg_time(msg,&otime); 2601553Srgrimes#ifdef sgi 2611553Srgrimes (void)cftime(newdate, "%D %T", &msg->tsp_time.tv_sec); 2621553Srgrimes (void)cftime(olddate, "%D %T", &otime.tv_sec); 2631553Srgrimes#else 2641553Srgrimes /* 2651553Srgrimes * the following line is necessary due to syslog 2661553Srgrimes * calling ctime() which clobbers the static buffer 2671553Srgrimes */ 2681553Srgrimes (void)strcpy(olddate, date()); 2691553Srgrimes (void)strcpy(newdate, ctime(&msg->tsp_time.tv_sec)); 2701553Srgrimes#endif /* sgi */ 2711553Srgrimes 2721553Srgrimes if (!good_host_name(msg->tsp_name)) { 2731553Srgrimes syslog(LOG_NOTICE, 2741553Srgrimes "attempted time setting by untrusted %s to %s", 2751553Srgrimes msg->tsp_name, newdate); 2761553Srgrimes suppress(&from, msg->tsp_name, fromnet); 2771553Srgrimes break; 2781553Srgrimes } 2791553Srgrimes 2801553Srgrimes setmaster(msg); 2811553Srgrimes timevalsub(&ntime, &msg->tsp_time, &otime); 2821553Srgrimes if (ntime.tv_sec < MAXADJ && ntime.tv_sec > -MAXADJ) { 2831553Srgrimes /* 2841553Srgrimes * do not change the clock if we can adjust it 2851553Srgrimes */ 2861553Srgrimes synch(tvtomsround(ntime)); 2871553Srgrimes } else { 2881553Srgrimes#ifdef sgi 2891553Srgrimes if (0 > settimeofday(&msg->tsp_time, 0)) { 2901553Srgrimes syslog(LOG_ERR,"settimeofdate(): %m"); 2911553Srgrimes break; 2921553Srgrimes } 2931553Srgrimes logwtmp(&otime, &msg->tsp_time); 2941553Srgrimes#else 2951553Srgrimes logwtmp("|", "date", ""); 2961553Srgrimes (void)settimeofday(&msg->tsp_time, 0); 2971553Srgrimes logwtmp("}", "date", ""); 2981553Srgrimes#endif /* sgi */ 2991553Srgrimes syslog(LOG_NOTICE, 3001553Srgrimes "date changed by %s from %s", 3011553Srgrimes msg->tsp_name, olddate); 3021553Srgrimes if (status & MASTER) 3031553Srgrimes spreadtime(); 3041553Srgrimes } 3051553Srgrimes (void)gettimeofday(&ntime, 0); 3061553Srgrimes electiontime = ntime.tv_sec + delay2; 3071553Srgrimes fastelection = ntime.tv_sec + FASTTOUT; 3081553Srgrimes 3091553Srgrimes/* This patches a bad protocol bug. Imagine a system with several networks, 3101553Srgrimes * where there are a pair of redundant gateways between a pair of networks, 3111553Srgrimes * each running timed. Assume that we start with a third machine mastering 3121553Srgrimes * one of the networks, and one of the gateways mastering the other. 3131553Srgrimes * Imagine that the third machine goes away and the non-master gateway 3141553Srgrimes * decides to replace it. If things are timed just 'right,' we will have 3151553Srgrimes * each gateway mastering one network for a little while. If a SETTIME 3161553Srgrimes * message gets into the network at that time, perhaps from the newly 3171553Srgrimes * masterful gateway as it was taking control, the SETTIME will loop 3181553Srgrimes * forever. Each time a gateway receives it on its slave side, it will 3191553Srgrimes * call spreadtime to forward it on its mastered network. We are now in 3201553Srgrimes * a permanent loop, since the SETTIME msgs will keep any clock 3211553Srgrimes * in the network from advancing. Normally, the 'LOOP' stuff will detect 3221553Srgrimes * and correct the situation. However, with the clocks stopped, the 3231553Srgrimes * 'looptime' timer cannot expire. While they are in this state, the 3241553Srgrimes * masters will try to saturate the network with SETTIME packets. 3251553Srgrimes */ 3261553Srgrimes looptime = ntime.tv_sec + (looptime-otime.tv_sec)/2-1; 3271553Srgrimes break; 3281553Srgrimes 3291553Srgrimes case TSP_MASTERUP: 3301553Srgrimes if (slavenet && fromnet != slavenet) 3311553Srgrimes break; 3321553Srgrimes if (!good_host_name(msg->tsp_name)) { 3331553Srgrimes suppress(&from, msg->tsp_name, fromnet); 3341553Srgrimes if (electiontime > fastelection) 3351553Srgrimes electiontime = fastelection; 3361553Srgrimes break; 3371553Srgrimes } 3381553Srgrimes makeslave(fromnet); 3391553Srgrimes setmaster(msg); 3401553Srgrimes setstatus(); 3411553Srgrimes answerdelay(); 3421553Srgrimes xmit(TSP_SLAVEUP, 0, &from); 3431553Srgrimes (void)gettimeofday(&ntime, 0); 3441553Srgrimes electiontime = ntime.tv_sec + delay2; 3451553Srgrimes fastelection = ntime.tv_sec + FASTTOUT; 3461553Srgrimes refusetime = 0; 3471553Srgrimes break; 3481553Srgrimes 3491553Srgrimes case TSP_MASTERREQ: 3501553Srgrimes if (fromnet->status != SLAVE) 3511553Srgrimes break; 3521553Srgrimes (void)gettimeofday(&ntime, 0); 3531553Srgrimes electiontime = ntime.tv_sec + delay2; 3541553Srgrimes break; 3551553Srgrimes 3561553Srgrimes case TSP_SETDATE: 3571553Srgrimes#ifdef sgi 3581553Srgrimes (void)cftime(newdate, "%D %T", &msg->tsp_time.tv_sec); 3591553Srgrimes#else 3601553Srgrimes (void)strcpy(newdate, ctime(&msg->tsp_time.tv_sec)); 3611553Srgrimes#endif /* sgi */ 3621553Srgrimes schgdate(msg, newdate); 3631553Srgrimes break; 3641553Srgrimes 3651553Srgrimes case TSP_SETDATEREQ: 3661553Srgrimes if (fromnet->status != MASTER) 3671553Srgrimes break; 3681553Srgrimes#ifdef sgi 3691553Srgrimes (void)cftime(newdate, "%D %T", &msg->tsp_time.tv_sec); 3701553Srgrimes#else 3711553Srgrimes (void)strcpy(newdate, ctime(&msg->tsp_time.tv_sec)); 3721553Srgrimes#endif /* sgi */ 3731553Srgrimes htp = findhost(msg->tsp_name); 3741553Srgrimes if (0 == htp) { 3751553Srgrimes syslog(LOG_WARNING, 3761553Srgrimes "DATEREQ from uncontrolled machine"); 3771553Srgrimes break; 3781553Srgrimes } 3791553Srgrimes if (!htp->good) { 3801553Srgrimes syslog(LOG_WARNING, 3811553Srgrimes "attempted date change by untrusted %s to %s", 3821553Srgrimes htp->name, newdate); 3831553Srgrimes spreadtime(); 3841553Srgrimes break; 3851553Srgrimes } 3861553Srgrimes schgdate(msg, newdate); 3871553Srgrimes break; 3881553Srgrimes 3891553Srgrimes case TSP_TRACEON: 3901553Srgrimes traceon(); 3911553Srgrimes break; 3921553Srgrimes 3931553Srgrimes case TSP_TRACEOFF: 3941553Srgrimes traceoff("Tracing ended at %s\n"); 3951553Srgrimes break; 3961553Srgrimes 3971553Srgrimes case TSP_SLAVEUP: 3981553Srgrimes newslave(msg); 3991553Srgrimes break; 4001553Srgrimes 4011553Srgrimes case TSP_ELECTION: 4021553Srgrimes if (fromnet->status == SLAVE) { 4031553Srgrimes (void)gettimeofday(&ntime, 0); 4041553Srgrimes electiontime = ntime.tv_sec + delay2; 4051553Srgrimes fastelection = ntime.tv_sec + FASTTOUT; 4061553Srgrimes seq = 0; 4071553Srgrimes if (!good_host_name(msg->tsp_name)) { 4081553Srgrimes syslog(LOG_NOTICE, 4091553Srgrimes "suppress election of %s", 4101553Srgrimes msg->tsp_name); 4111553Srgrimes to.tsp_type = TSP_QUIT; 4121553Srgrimes electiontime = fastelection; 4131553Srgrimes } else if (cadr.s_addr != from.sin_addr.s_addr 4141553Srgrimes && ntime.tv_sec < refusetime) { 4151553Srgrimes/* if the candidate has to repeat itself, the old code would refuse it 4161553Srgrimes * the second time. That would prevent elections. 4171553Srgrimes */ 4181553Srgrimes to.tsp_type = TSP_REFUSE; 4191553Srgrimes } else { 4201553Srgrimes cadr.s_addr = from.sin_addr.s_addr; 4211553Srgrimes to.tsp_type = TSP_ACCEPT; 4221553Srgrimes refusetime = ntime.tv_sec + 30; 4231553Srgrimes } 4241553Srgrimes taddr = from; 4251553Srgrimes (void)strcpy(tname, msg->tsp_name); 4261553Srgrimes (void)strcpy(to.tsp_name, hostname); 4271553Srgrimes answerdelay(); 4281553Srgrimes if (!acksend(&to, &taddr, tname, 4291553Srgrimes TSP_ACK, 0, 0)) 4301553Srgrimes syslog(LOG_WARNING, 4311553Srgrimes "no answer from candidate %s\n", 4321553Srgrimes tname); 4331553Srgrimes 4341553Srgrimes } else { /* fromnet->status == MASTER */ 4351553Srgrimes htp = addmach(msg->tsp_name, &from,fromnet); 4361553Srgrimes to.tsp_type = TSP_QUIT; 4371553Srgrimes (void)strcpy(to.tsp_name, hostname); 4381553Srgrimes if (!acksend(&to, &htp->addr, htp->name, 4391553Srgrimes TSP_ACK, 0, htp->noanswer)) { 4401553Srgrimes syslog(LOG_ERR, 4411553Srgrimes "no reply from %s to ELECTION-QUIT", 4421553Srgrimes htp->name); 4431553Srgrimes (void)remmach(htp); 4441553Srgrimes } 4451553Srgrimes } 4461553Srgrimes break; 4471553Srgrimes 4481553Srgrimes case TSP_CONFLICT: 4491553Srgrimes if (fromnet->status != MASTER) 4501553Srgrimes break; 4511553Srgrimes /* 4521553Srgrimes * After a network partition, there can be 4531553Srgrimes * more than one master: the first slave to 4541553Srgrimes * come up will notify here the situation. 4551553Srgrimes */ 4561553Srgrimes (void)strcpy(to.tsp_name, hostname); 4571553Srgrimes 4581553Srgrimes /* The other master often gets into the same state, 4591553Srgrimes * with boring results. 4601553Srgrimes */ 4611553Srgrimes ntp = fromnet; /* (acksend() can leave fromnet=0 */ 4621553Srgrimes for (tries = 0; tries < 3; tries++) { 4631553Srgrimes to.tsp_type = TSP_RESOLVE; 4641553Srgrimes answer = acksend(&to, &ntp->dest_addr, 4651553Srgrimes ANYADDR, TSP_MASTERACK, 4661553Srgrimes ntp, 0); 4671553Srgrimes if (answer == NULL) 4681553Srgrimes break; 4691553Srgrimes htp = addmach(answer->tsp_name,&from,ntp); 4701553Srgrimes to.tsp_type = TSP_QUIT; 4711553Srgrimes answer = acksend(&to, &htp->addr, htp->name, 4721553Srgrimes TSP_ACK, 0, htp->noanswer); 4731553Srgrimes if (!answer) { 4741553Srgrimes syslog(LOG_WARNING, 4751553Srgrimes "conflict error: no reply from %s to QUIT", 4761553Srgrimes htp->name); 4771553Srgrimes (void)remmach(htp); 4781553Srgrimes } 4791553Srgrimes } 4801553Srgrimes masterup(ntp); 4811553Srgrimes break; 4821553Srgrimes 4831553Srgrimes case TSP_MSITE: 4841553Srgrimes if (!slavenet) 4851553Srgrimes break; 4861553Srgrimes taddr = from; 4871553Srgrimes to.tsp_type = TSP_MSITEREQ; 4881553Srgrimes to.tsp_vers = TSPVERSION; 4891553Srgrimes to.tsp_seq = 0; 4901553Srgrimes (void)strcpy(to.tsp_name, hostname); 4911553Srgrimes answer = acksend(&to, &slavenet->dest_addr, 4921553Srgrimes ANYADDR, TSP_ACK, 4931553Srgrimes slavenet, 0); 4941553Srgrimes if (answer != NULL 4951553Srgrimes && good_host_name(answer->tsp_name)) { 4961553Srgrimes setmaster(answer); 4971553Srgrimes to.tsp_type = TSP_ACK; 4981553Srgrimes (void)strcpy(to.tsp_name, answer->tsp_name); 4991553Srgrimes bytenetorder(&to); 5001553Srgrimes if (sendto(sock, (char *)&to, 5011553Srgrimes sizeof(struct tsp), 0, 5021553Srgrimes (struct sockaddr*)&taddr, sizeof(taddr)) < 0) { 5031553Srgrimes trace_sendto_err(taddr.sin_addr); 5041553Srgrimes } 5051553Srgrimes } 5061553Srgrimes break; 5071553Srgrimes 5081553Srgrimes case TSP_MSITEREQ: 5091553Srgrimes break; 5101553Srgrimes 5111553Srgrimes case TSP_ACCEPT: 5121553Srgrimes case TSP_REFUSE: 5131553Srgrimes case TSP_RESOLVE: 5141553Srgrimes break; 5151553Srgrimes 5161553Srgrimes case TSP_QUIT: 5171553Srgrimes doquit(msg); /* become a slave */ 5181553Srgrimes break; 5191553Srgrimes 5201553Srgrimes case TSP_TEST: 5211553Srgrimes electiontime = 0; 5221553Srgrimes break; 5231553Srgrimes 5241553Srgrimes case TSP_LOOP: 5251553Srgrimes /* looking for loops of masters */ 5261553Srgrimes if (!(status & MASTER)) 5271553Srgrimes break; 5281553Srgrimes if (fromnet->status == SLAVE) { 5291553Srgrimes if (!strcmp(msg->tsp_name, hostname)) { 5301553Srgrimes /* 5311553Srgrimes * Someone forwarded our message back to 5321553Srgrimes * us. There must be a loop. Tell the 5331553Srgrimes * master of this network to quit. 5341553Srgrimes * 5351553Srgrimes * The other master often gets into 5361553Srgrimes * the same state, with boring results. 5371553Srgrimes */ 5381553Srgrimes ntp = fromnet; 5391553Srgrimes for (tries = 0; tries < 3; tries++) { 5401553Srgrimes to.tsp_type = TSP_RESOLVE; 5411553Srgrimes answer = acksend(&to, &ntp->dest_addr, 5421553Srgrimes ANYADDR, TSP_MASTERACK, 5431553Srgrimes ntp,0); 5441553Srgrimes if (answer == NULL) 5451553Srgrimes break; 5461553Srgrimes taddr = from; 5471553Srgrimes (void)strcpy(tname, answer->tsp_name); 5481553Srgrimes to.tsp_type = TSP_QUIT; 5491553Srgrimes (void)strcpy(to.tsp_name, hostname); 5501553Srgrimes if (!acksend(&to, &taddr, tname, 5511553Srgrimes TSP_ACK, 0, 1)) { 5521553Srgrimes syslog(LOG_ERR, 5531553Srgrimes "no reply from %s to slave LOOP-QUIT", 5541553Srgrimes tname); 5551553Srgrimes } else { 5561553Srgrimes electiontime = 0; 5571553Srgrimes } 5581553Srgrimes } 5591553Srgrimes (void)gettimeofday(&ntime, 0); 5601553Srgrimes looptime = ntime.tv_sec + FASTTOUT; 5611553Srgrimes } else { 5621553Srgrimes if (msg->tsp_hopcnt-- < 1) 5631553Srgrimes break; 5641553Srgrimes bytenetorder(msg); 5651553Srgrimes for (ntp = nettab; ntp != 0; ntp = ntp->next) { 5661553Srgrimes if (ntp->status == MASTER 5671553Srgrimes && 0 > sendto(sock, (char *)msg, 5681553Srgrimes sizeof(struct tsp), 0, 5691553Srgrimes (struct sockaddr*)&ntp->dest_addr, 5701553Srgrimes sizeof(ntp->dest_addr))) 5711553Srgrimes trace_sendto_err(ntp->dest_addr.sin_addr); 5721553Srgrimes } 5731553Srgrimes } 5741553Srgrimes } else { /* fromnet->status == MASTER */ 5751553Srgrimes /* 5761553Srgrimes * We should not have received this from a net 5771553Srgrimes * we are master on. There must be two masters, 5781553Srgrimes * unless the packet was really from us. 5791553Srgrimes */ 5801553Srgrimes if (from.sin_addr.s_addr 5811553Srgrimes == fromnet->my_addr.s_addr) { 5821553Srgrimes if (trace) 5831553Srgrimes fprintf(fd,"discarding forwarded LOOP\n"); 5841553Srgrimes break; 5851553Srgrimes } 5861553Srgrimes 5871553Srgrimes /* 5881553Srgrimes * The other master often gets into the same 5891553Srgrimes * state, with boring results. 5901553Srgrimes */ 5911553Srgrimes ntp = fromnet; 5921553Srgrimes for (tries = 0; tries < 3; tries++) { 5931553Srgrimes to.tsp_type = TSP_RESOLVE; 5941553Srgrimes answer = acksend(&to, &ntp->dest_addr, 5951553Srgrimes ANYADDR, TSP_MASTERACK, 5961553Srgrimes ntp,0); 5971553Srgrimes if (!answer) 5981553Srgrimes break; 5991553Srgrimes htp = addmach(answer->tsp_name, 6001553Srgrimes &from,ntp); 6011553Srgrimes to.tsp_type = TSP_QUIT; 6021553Srgrimes (void)strcpy(to.tsp_name, hostname); 6031553Srgrimes if (!acksend(&to,&htp->addr,htp->name, 6041553Srgrimes TSP_ACK, 0, htp->noanswer)) { 6051553Srgrimes syslog(LOG_ERR, 6061553Srgrimes "no reply from %s to master LOOP-QUIT", 6071553Srgrimes htp->name); 6081553Srgrimes (void)remmach(htp); 6091553Srgrimes } 6101553Srgrimes } 6111553Srgrimes (void)gettimeofday(&ntime, 0); 6121553Srgrimes looptime = ntime.tv_sec + FASTTOUT; 6131553Srgrimes } 6141553Srgrimes break; 6151553Srgrimes default: 6161553Srgrimes if (trace) { 6171553Srgrimes fprintf(fd, "garbage message: "); 6181553Srgrimes print(msg, &from); 6191553Srgrimes } 6201553Srgrimes break; 6211553Srgrimes } 6221553Srgrimes } 6231553Srgrimes goto loop; 6241553Srgrimes} 6251553Srgrimes 6261553Srgrimes 6271553Srgrimes/* 6281553Srgrimes * tell the world who our master is 6291553Srgrimes */ 6301553Srgrimesstatic void 6311553Srgrimessetmaster(msg) 6321553Srgrimes struct tsp *msg; 6331553Srgrimes{ 6341553Srgrimes if (slavenet 6351553Srgrimes && (slavenet != old_slavenet 6361553Srgrimes || strcmp(msg->tsp_name, master_name) 6371553Srgrimes || old_status != status)) { 6381553Srgrimes (void)strcpy(master_name, msg->tsp_name); 6391553Srgrimes old_slavenet = slavenet; 6401553Srgrimes old_status = status; 6411553Srgrimes 6421553Srgrimes if (status & MASTER) { 6431553Srgrimes syslog(LOG_NOTICE, "submaster to %s", master_name); 6441553Srgrimes if (trace) 6451553Srgrimes fprintf(fd, "submaster to %s\n", master_name); 6461553Srgrimes 6471553Srgrimes } else { 6481553Srgrimes syslog(LOG_NOTICE, "slave to %s", master_name); 6491553Srgrimes if (trace) 6501553Srgrimes fprintf(fd, "slave to %s\n", master_name); 6511553Srgrimes } 6521553Srgrimes } 6531553Srgrimes} 6541553Srgrimes 6551553Srgrimes 6561553Srgrimes 6571553Srgrimes/* 6581553Srgrimes * handle date change request on a slave 6591553Srgrimes */ 6601553Srgrimesstatic void 6611553Srgrimesschgdate(msg, newdate) 6621553Srgrimes struct tsp *msg; 6631553Srgrimes char *newdate; 6641553Srgrimes{ 6651553Srgrimes struct tsp to; 6661553Srgrimes u_short seq; 6671553Srgrimes struct sockaddr_in taddr; 6681553Srgrimes struct timeval otime; 6691553Srgrimes 6701553Srgrimes if (!slavenet) 6711553Srgrimes return; /* no where to forward */ 6721553Srgrimes 6731553Srgrimes taddr = from; 6741553Srgrimes seq = msg->tsp_seq; 6751553Srgrimes 6761553Srgrimes syslog(LOG_INFO, 6771553Srgrimes "forwarding date change by %s to %s", 6781553Srgrimes msg->tsp_name, newdate); 6791553Srgrimes 6801553Srgrimes /* adjust time for residence on the queue */ 6811553Srgrimes (void)gettimeofday(&otime, 0); 6821553Srgrimes adj_msg_time(msg, &otime); 6831553Srgrimes 6841553Srgrimes to.tsp_type = TSP_SETDATEREQ; 6851553Srgrimes to.tsp_time = msg->tsp_time; 6861553Srgrimes (void)strcpy(to.tsp_name, hostname); 6871553Srgrimes if (!acksend(&to, &slavenet->dest_addr, 6881553Srgrimes ANYADDR, TSP_DATEACK, 6891553Srgrimes slavenet, 0)) 6901553Srgrimes return; /* no answer */ 6911553Srgrimes 6921553Srgrimes xmit(TSP_DATEACK, seq, &taddr); 6931553Srgrimes} 6941553Srgrimes 6951553Srgrimes 6961553Srgrimes/* 6971553Srgrimes * Used before answering a broadcast message to avoid network 6981553Srgrimes * contention and likely collisions. 6991553Srgrimes */ 7001553Srgrimesstatic void 7011553Srgrimesanswerdelay() 7021553Srgrimes{ 7031553Srgrimes#ifdef sgi 7041553Srgrimes sginap(delay1); 7051553Srgrimes#else 7061553Srgrimes struct timeval timeout; 7071553Srgrimes 7081553Srgrimes timeout.tv_sec = 0; 7091553Srgrimes timeout.tv_usec = delay1; 7101553Srgrimes 7111553Srgrimes (void)select(0, (fd_set *)NULL, (fd_set *)NULL, (fd_set *)NULL, 7121553Srgrimes &timeout); 7131553Srgrimes return; 7141553Srgrimes#endif /* sgi */ 7151553Srgrimes} 716