int slave() { int tries; long electiontime, refusetime, looktime, looptime, adjtime; u_short seq; long fastelection; #define FASTTOUT 3 struct in_addr cadr; struct timeval otime; struct sockaddr_in taddr; char tname[MAXHOSTNAMELEN]; struct tsp *msg, to; struct timeval ntime, wait, tmptv; time_t tsp_time_sec; struct tsp *answer; int timeout(); char olddate[32]; char newdate[32]; struct netinfo *ntp; struct hosttbl *htp; struct utmpx utx; old_slavenet = 0; seq = 0; refusetime = 0; adjtime = 0; (void)gettimeofday(&ntime, NULL); electiontime = ntime.tv_sec + delay2; fastelection = ntime.tv_sec + FASTTOUT; if (justquit) looktime = electiontime; else looktime = fastelection; looptime = fastelection; if (slavenet) xmit(TSP_SLAVEUP, 0, &slavenet->dest_addr); if (status & MASTER) { for (ntp = nettab; ntp != NULL; ntp = ntp->next) { if (ntp->status == MASTER) masterup(ntp); } } loop: get_goodgroup(0); (void)gettimeofday(&ntime, NULL); if (ntime.tv_sec > electiontime) { if (trace) fprintf(fd, "election timer expired\n"); longjmp(jmpenv, 1); } if (ntime.tv_sec >= looktime) { if (trace) fprintf(fd, "Looking for nets to master\n"); if (Mflag && nignorednets > 0) { for (ntp = nettab; ntp != NULL; ntp = ntp->next) { if (ntp->status == IGNORE || ntp->status == NOMASTER) { lookformaster(ntp); if (ntp->status == MASTER) { masterup(ntp); } else if (ntp->status == MASTER) { ntp->status = NOMASTER; } } if (ntp->status == MASTER && --ntp->quit_count < 0) ntp->quit_count = 0; } makeslave(slavenet); /* prune extras */ setstatus(); } (void)gettimeofday(&ntime, NULL); looktime = ntime.tv_sec + delay2; } if (ntime.tv_sec >= looptime) { if (trace) fprintf(fd, "Looking for loops\n"); for (ntp = nettab; ntp != NULL; ntp = ntp->next) { if (ntp->status == MASTER) { to.tsp_type = TSP_LOOP; to.tsp_vers = TSPVERSION; to.tsp_seq = sequence++; to.tsp_hopcnt = MAX_HOPCNT; (void)strcpy(to.tsp_name, hostname); bytenetorder(&to); if (sendto(sock, (char *)&to, sizeof(struct tsp), 0, (struct sockaddr*)&ntp->dest_addr, sizeof(ntp->dest_addr)) < 0) { trace_sendto_err(ntp->dest_addr.sin_addr); } } } (void)gettimeofday(&ntime, NULL); looptime = ntime.tv_sec + delay2; } wait.tv_sec = min(electiontime,min(looktime,looptime)) - ntime.tv_sec; if (wait.tv_sec < 0) wait.tv_sec = 0; wait.tv_sec += FASTTOUT; wait.tv_usec = 0; msg = readmsg(TSP_ANY, ANYADDR, &wait, 0); if (msg != NULL) { /* * filter stuff not for us */ switch (msg->tsp_type) { case TSP_SETDATE: case TSP_TRACEOFF: case TSP_TRACEON: /* * XXX check to see they are from ourself */ break; case TSP_TEST: case TSP_MSITE: break; case TSP_MASTERUP: if (!fromnet) { if (trace) { fprintf(fd, "slave ignored: "); print(msg, &from); } goto loop; } break; default: if (!fromnet || fromnet->status == IGNORE || fromnet->status == NOMASTER) { if (trace) { fprintf(fd, "slave ignored: "); print(msg, &from); } goto loop; } break; } /* * now process the message */ switch (msg->tsp_type) { case TSP_ADJTIME: if (fromnet != slavenet) break; if (!good_host_name(msg->tsp_name)) { syslog(LOG_NOTICE, "attempted time adjustment by %s", msg->tsp_name); suppress(&from, msg->tsp_name, fromnet); break; } /* * Speed up loop detection in case we have a loop. * Otherwise the clocks can race until the loop * is found. */ (void)gettimeofday(&otime, NULL); if (adjtime < otime.tv_sec) looptime -= (looptime-otime.tv_sec)/2 + 1; setmaster(msg); if (seq != msg->tsp_seq) { seq = msg->tsp_seq; synch(tvtomsround(msg->tsp_time)); } (void)gettimeofday(&ntime, NULL); electiontime = ntime.tv_sec + delay2; fastelection = ntime.tv_sec + FASTTOUT; adjtime = ntime.tv_sec + SAMPLEINTVL*2; break; case TSP_SETTIME: if (fromnet != slavenet) break; if (seq == msg->tsp_seq) break; seq = msg->tsp_seq; /* adjust time for residence on the queue */ (void)gettimeofday(&otime, NULL); adj_msg_time(msg,&otime); /* * the following line is necessary due to syslog * calling ctime() which clobbers the static buffer */ (void)strcpy(olddate, date()); tsp_time_sec = msg->tsp_time.tv_sec; (void)strcpy(newdate, ctime(&tsp_time_sec)); if (!good_host_name(msg->tsp_name)) { syslog(LOG_NOTICE, "attempted time setting by untrusted %s to %s", msg->tsp_name, newdate); suppress(&from, msg->tsp_name, fromnet); break; } setmaster(msg); tmptv.tv_sec = msg->tsp_time.tv_sec; tmptv.tv_usec = msg->tsp_time.tv_usec; timevalsub(&ntime, &tmptv, &otime); if (ntime.tv_sec < MAXADJ && ntime.tv_sec > -MAXADJ) { /* * do not change the clock if we can adjust it */ synch(tvtomsround(ntime)); } else { utx.ut_type = OLD_TIME; gettimeofday(&utx.ut_tv, NULL); pututxline(&utx); (void)settimeofday(&tmptv, 0); utx.ut_type = NEW_TIME; gettimeofday(&utx.ut_tv, NULL); pututxline(&utx); syslog(LOG_NOTICE, "date changed by %s from %s", msg->tsp_name, olddate); if (status & MASTER) spreadtime(); } (void)gettimeofday(&ntime, NULL); electiontime = ntime.tv_sec + delay2; fastelection = ntime.tv_sec + FASTTOUT; /* This patches a bad protocol bug. Imagine a system with several networks, * where there are a pair of redundant gateways between a pair of networks, * each running timed. Assume that we start with a third machine mastering * one of the networks, and one of the gateways mastering the other. * Imagine that the third machine goes away and the non-master gateway * decides to replace it. If things are timed just 'right,' we will have * each gateway mastering one network for a little while. If a SETTIME * message gets into the network at that time, perhaps from the newly * masterful gateway as it was taking control, the SETTIME will loop * forever. Each time a gateway receives it on its slave side, it will * call spreadtime to forward it on its mastered network. We are now in * a permanent loop, since the SETTIME msgs will keep any clock * in the network from advancing. Normally, the 'LOOP' stuff will detect * and correct the situation. However, with the clocks stopped, the * 'looptime' timer cannot expire. While they are in this state, the * masters will try to saturate the network with SETTIME packets. */ looptime = ntime.tv_sec + (looptime-otime.tv_sec)/2-1; break; case TSP_MASTERUP: if (slavenet && fromnet != slavenet) break; if (!good_host_name(msg->tsp_name)) { suppress(&from, msg->tsp_name, fromnet); if (electiontime > fastelection) electiontime = fastelection; break; } makeslave(fromnet); setmaster(msg); setstatus(); answerdelay(); xmit(TSP_SLAVEUP, 0, &from); (void)gettimeofday(&ntime, NULL); electiontime = ntime.tv_sec + delay2; fastelection = ntime.tv_sec + FASTTOUT; refusetime = 0; break; case TSP_MASTERREQ: if (fromnet->status != SLAVE) break; (void)gettimeofday(&ntime, NULL); electiontime = ntime.tv_sec + delay2; break; case TSP_SETDATE: tsp_time_sec = msg->tsp_time.tv_sec; (void)strcpy(newdate, ctime(&tsp_time_sec)); schgdate(msg, newdate); break; case TSP_SETDATEREQ: if (fromnet->status != MASTER) break; tsp_time_sec = msg->tsp_time.tv_sec; (void)strcpy(newdate, ctime(&tsp_time_sec)); htp = findhost(msg->tsp_name); if (0 == htp) { syslog(LOG_WARNING, "DATEREQ from uncontrolled machine"); break; } if (!htp->good) { syslog(LOG_WARNING, "attempted date change by untrusted %s to %s", htp->name, newdate); spreadtime(); break; } schgdate(msg, newdate); break; case TSP_TRACEON: traceon(); break; case TSP_TRACEOFF: traceoff("Tracing ended at %s\n"); break; case TSP_SLAVEUP: newslave(msg); break; case TSP_ELECTION: if (fromnet->status == SLAVE) { (void)gettimeofday(&ntime, NULL); electiontime = ntime.tv_sec + delay2; fastelection = ntime.tv_sec + FASTTOUT; seq = 0; if (!good_host_name(msg->tsp_name)) { syslog(LOG_NOTICE, "suppress election of %s", msg->tsp_name); to.tsp_type = TSP_QUIT; electiontime = fastelection; } else if (cadr.s_addr != from.sin_addr.s_addr && ntime.tv_sec < refusetime) { /* if the candidate has to repeat itself, the old code would refuse it * the second time. That would prevent elections. */ to.tsp_type = TSP_REFUSE; } else { cadr.s_addr = from.sin_addr.s_addr; to.tsp_type = TSP_ACCEPT; refusetime = ntime.tv_sec + 30; } taddr = from; (void)strcpy(tname, msg->tsp_name); (void)strcpy(to.tsp_name, hostname); answerdelay(); if (!acksend(&to, &taddr, tname, TSP_ACK, 0, 0)) syslog(LOG_WARNING, "no answer from candidate %s\n", tname); } else { /* fromnet->status == MASTER */ htp = addmach(msg->tsp_name, &from,fromnet); to.tsp_type = TSP_QUIT; (void)strcpy(to.tsp_name, hostname); if (!acksend(&to, &htp->addr, htp->name, TSP_ACK, 0, htp->noanswer)) { syslog(LOG_ERR, "no reply from %s to ELECTION-QUIT", htp->name); (void)remmach(htp); } } break; case TSP_CONFLICT: if (fromnet->status != MASTER) break; /* * After a network partition, there can be * more than one master: the first slave to * come up will notify here the situation. */ (void)strcpy(to.tsp_name, hostname); /* The other master often gets into the same state, * with boring results. */ ntp = fromnet; /* (acksend() can leave fromnet=0 */ for (tries = 0; tries < 3; tries++) { to.tsp_type = TSP_RESOLVE; answer = acksend(&to, &ntp->dest_addr, ANYADDR, TSP_MASTERACK, ntp, 0); if (answer == NULL) break; htp = addmach(answer->tsp_name,&from,ntp); to.tsp_type = TSP_QUIT; answer = acksend(&to, &htp->addr, htp->name, TSP_ACK, 0, htp->noanswer); if (!answer) { syslog(LOG_WARNING, "conflict error: no reply from %s to QUIT", htp->name); (void)remmach(htp); } } masterup(ntp); break; case TSP_MSITE: if (!slavenet) break; taddr = from; to.tsp_type = TSP_MSITEREQ; to.tsp_vers = TSPVERSION; to.tsp_seq = 0; (void)strcpy(to.tsp_name, hostname); answer = acksend(&to, &slavenet->dest_addr, ANYADDR, TSP_ACK, slavenet, 0); if (answer != NULL && good_host_name(answer->tsp_name)) { setmaster(answer); to.tsp_type = TSP_ACK; (void)strcpy(to.tsp_name, answer->tsp_name); bytenetorder(&to); if (sendto(sock, (char *)&to, sizeof(struct tsp), 0, (struct sockaddr*)&taddr, sizeof(taddr)) < 0) { trace_sendto_err(taddr.sin_addr); } } break; case TSP_MSITEREQ: break; case TSP_ACCEPT: case TSP_REFUSE: case TSP_RESOLVE: break; case TSP_QUIT: doquit(msg); /* become a slave */ break; case TSP_TEST: electiontime = 0; break; case TSP_LOOP: /* looking for loops of masters */ if (!(status & MASTER)) break; if (fromnet->status == SLAVE) { if (!strcmp(msg->tsp_name, hostname)) { /* * Someone forwarded our message back to * us. There must be a loop. Tell the * master of this network to quit. * * The other master often gets into * the same state, with boring results. */ ntp = fromnet; for (tries = 0; tries < 3; tries++) { to.tsp_type = TSP_RESOLVE; answer = acksend(&to, &ntp->dest_addr, ANYADDR, TSP_MASTERACK, ntp,0); if (answer == NULL) break; taddr = from; (void)strcpy(tname, answer->tsp_name); to.tsp_type = TSP_QUIT; (void)strcpy(to.tsp_name, hostname); if (!acksend(&to, &taddr, tname, TSP_ACK, 0, 1)) { syslog(LOG_ERR, "no reply from %s to slave LOOP-QUIT", tname); } else { electiontime = 0; } } (void)gettimeofday(&ntime, NULL); looptime = ntime.tv_sec + FASTTOUT; } else { if (msg->tsp_hopcnt-- < 1) break; bytenetorder(msg); for (ntp = nettab; ntp != 0; ntp = ntp->next) { if (ntp->status == MASTER && 0 > sendto(sock, (char *)msg, sizeof(struct tsp), 0, (struct sockaddr*)&ntp->dest_addr, sizeof(ntp->dest_addr))) trace_sendto_err(ntp->dest_addr.sin_addr); } } } else { /* fromnet->status == MASTER */ /* * We should not have received this from a net * we are master on. There must be two masters, * unless the packet was really from us. */ if (from.sin_addr.s_addr == fromnet->my_addr.s_addr) { if (trace) fprintf(fd,"discarding forwarded LOOP\n"); break; } /* * The other master often gets into the same * state, with boring results. */ ntp = fromnet; for (tries = 0; tries < 3; tries++) { to.tsp_type = TSP_RESOLVE; answer = acksend(&to, &ntp->dest_addr, ANYADDR, TSP_MASTERACK, ntp,0); if (!answer) break; htp = addmach(answer->tsp_name, &from,ntp); to.tsp_type = TSP_QUIT; (void)strcpy(to.tsp_name, hostname); if (!acksend(&to,&htp->addr,htp->name, TSP_ACK, 0, htp->noanswer)) { syslog(LOG_ERR, "no reply from %s to master LOOP-QUIT", htp->name); (void)remmach(htp); } } (void)gettimeofday(&ntime, NULL); looptime = ntime.tv_sec + FASTTOUT; } break; default: if (trace) { fprintf(fd, "garbage message: "); print(msg, &from); } break; } } goto loop; }
slave() { int length; int senddateack; long electiontime, refusetime, looktime; u_short seq; char candidate[MAXHOSTNAMELEN]; struct tsp *msg, to, *readmsg(); struct sockaddr_in saveaddr, msaveaddr; struct timeval wait; struct timeval time, otime; struct tsp *answer, *acksend(); int timeout(); char *date(); long casual(); int bytenetorder(); char olddate[32]; struct sockaddr_in server; register struct netinfo *ntp; int ind; struct tsp resp; extern int Mflag; extern int justquit; #ifdef MEASURE extern FILE *fp; #endif if (slavenet) { resp.tsp_type = TSP_SLAVEUP; resp.tsp_vers = TSPVERSION; (void)strcpy(resp.tsp_name, hostname); bytenetorder(&resp); if (sendto(sock, (char *)&resp, sizeof(struct tsp), 0, &slavenet->dest_addr, sizeof(struct sockaddr_in)) < 0) { syslog(LOG_ERR, "sendto: %m"); exit(1); } } if (status & MASTER) { #ifdef MEASURE if (fp == NULL) { fp = fopen("/usr/adm/timed.masterlog", "w"); setlinebuf(fp); } #endif syslog(LOG_INFO, "THIS MACHINE IS A SUBMASTER"); if (trace) { fprintf(fd, "THIS MACHINE IS A SUBMASTER\n"); } for (ntp = nettab; ntp != NULL; ntp = ntp->next) if (ntp->status == MASTER) masterup(ntp); } else { syslog(LOG_INFO, "THIS MACHINE IS A SLAVE"); if (trace) { fprintf(fd, "THIS MACHINE IS A SLAVE\n"); } } seq = 0; senddateack = OFF; refusetime = 0; (void)gettimeofday(&time, (struct timezone *)0); electiontime = time.tv_sec + delay2; if (Mflag) if (justquit) looktime = time.tv_sec + delay2; else looktime = 1; else looktime = 0; loop: length = sizeof(struct sockaddr_in); (void)gettimeofday(&time, (struct timezone *)0); if (time.tv_sec > electiontime) { if (trace) fprintf(fd, "election timer expired\n"); longjmp(jmpenv, 1); } if (looktime && time.tv_sec > looktime) { if (trace) fprintf(fd, "Looking for nets to master and loops\n"); if (nignorednets > 0) { for (ntp = nettab; ntp != NULL; ntp = ntp->next) { if (ntp->status == IGNORE) { lookformaster(ntp); if (ntp->status == MASTER) masterup(ntp); else ntp->status = IGNORE; } } setstatus(); #ifdef MEASURE /* * Check to see if we just became master * (file not open) */ if (fp == NULL) { fp = fopen("/usr/adm/timed.masterlog", "w"); setlinebuf(fp); } #endif } for (ntp = nettab; ntp != NULL; ntp = ntp->next) { if (ntp->status == MASTER) { to.tsp_type = TSP_LOOP; to.tsp_vers = TSPVERSION; to.tsp_seq = sequence++; to.tsp_hopcnt = 10; (void)strcpy(to.tsp_name, hostname); bytenetorder(&to); if (sendto(sock, (char *)&to, sizeof(struct tsp), 0, &ntp->dest_addr, sizeof(struct sockaddr_in)) < 0) { syslog(LOG_ERR, "sendto: %m"); exit(1); } } } (void)gettimeofday(&time, (struct timezone *)0); looktime = time.tv_sec + delay2; } wait.tv_sec = electiontime - time.tv_sec + 10; wait.tv_usec = 0; msg = readmsg(TSP_ANY, (char *)ANYADDR, &wait, (struct netinfo *)NULL); if (msg != NULL) { switch (msg->tsp_type) { case TSP_SETDATE: #ifdef TESTING case TSP_TEST: #endif case TSP_MSITE: case TSP_TRACEOFF: case TSP_TRACEON: break; case TSP_MASTERUP: if (fromnet == NULL) { if (trace) { fprintf(fd, "slave ignored: "); print(msg, &from); } goto loop; } break; default: if (fromnet == NULL || fromnet->status == IGNORE) { if (trace) { fprintf(fd, "slave ignored: "); print(msg, &from); } goto loop; } break; } switch (msg->tsp_type) { case TSP_ADJTIME: if (fromnet->status != SLAVE) break; (void)gettimeofday(&time, (struct timezone *)0); electiontime = time.tv_sec + delay2; if (seq != msg->tsp_seq) { seq = msg->tsp_seq; if ((status & SUBMASTER) == SUBMASTER) { synch((msg->tsp_time.tv_sec * 1000) + (msg->tsp_time.tv_usec / 1000)); } else { adjclock(&(msg->tsp_time)); } } break; case TSP_SETTIME: if (fromnet->status != SLAVE) break; if (seq == msg->tsp_seq) break; seq = msg->tsp_seq; (void)strcpy(olddate, date()); (void)gettimeofday(&otime, (struct timezone *)0); (void)settimeofday(&msg->tsp_time, (struct timezone *)0); syslog(LOG_NOTICE, "date changed by %s from: %s", msg->tsp_name, olddate); logwtmp(otime, msg->tsp_time); if ((status & SUBMASTER) == SUBMASTER) spreadtime(); (void)gettimeofday(&time, (struct timezone *)0); electiontime = time.tv_sec + delay2; if (senddateack == ON) { senddateack = OFF; msg->tsp_type = TSP_DATEACK; (void)strcpy(msg->tsp_name, hostname); bytenetorder(msg); length = sizeof(struct sockaddr_in); if (sendto(sock, (char *)msg, sizeof(struct tsp), 0, &saveaddr, length) < 0) { syslog(LOG_ERR, "sendto: %m"); exit(1); } } break; case TSP_MASTERUP: if (slavenet && fromnet != slavenet) break; makeslave(fromnet); setstatus(); msg->tsp_type = TSP_SLAVEUP; msg->tsp_vers = TSPVERSION; (void)strcpy(msg->tsp_name, hostname); bytenetorder(msg); answerdelay(); length = sizeof(struct sockaddr_in); if (sendto(sock, (char *)msg, sizeof(struct tsp), 0, &from, length) < 0) { syslog(LOG_ERR, "sendto: %m"); exit(1); } backoff = 1; delay2 = casual((long)MINTOUT, (long)MAXTOUT); (void)gettimeofday(&time, (struct timezone *)0); electiontime = time.tv_sec + delay2; refusetime = 0; break; case TSP_MASTERREQ: if (fromnet->status != SLAVE) break; (void)gettimeofday(&time, (struct timezone *)0); electiontime = time.tv_sec + delay2; break; case TSP_SETDATE: saveaddr = from; msg->tsp_type = TSP_SETDATEREQ; msg->tsp_vers = TSPVERSION; (void)strcpy(msg->tsp_name, hostname); for (ntp = nettab; ntp != NULL; ntp = ntp->next) { if (ntp->status == SLAVE) break; } if (ntp == NULL) break; answer = acksend(msg, &ntp->dest_addr, (char *)ANYADDR, TSP_DATEACK, ntp); if (answer != NULL) { msg->tsp_type = TSP_ACK; bytenetorder(msg); length = sizeof(struct sockaddr_in); if (sendto(sock, (char *)msg, sizeof(struct tsp), 0, &saveaddr, length) < 0) { syslog(LOG_ERR, "sendto: %m"); exit(1); } senddateack = ON; } break; case TSP_SETDATEREQ: saveaddr = from; if (status != SUBMASTER || fromnet->status != MASTER) break; for (ntp = nettab; ntp != NULL; ntp = ntp->next) { if (ntp->status == SLAVE) break; } ind = findhost(msg->tsp_name); if (ind < 0) { syslog(LOG_WARNING, "DATEREQ from uncontrolled machine"); break; } syslog(LOG_DEBUG, "forwarding date change request for %s", msg->tsp_name); (void)strcpy(msg->tsp_name, hostname); answer = acksend(msg, &ntp->dest_addr, (char *)ANYADDR, TSP_DATEACK, ntp); if (answer != NULL) { msg->tsp_type = TSP_DATEACK; bytenetorder(msg); length = sizeof(struct sockaddr_in); if (sendto(sock, (char *)msg, sizeof(struct tsp), 0, &saveaddr, length) < 0) { syslog(LOG_ERR, "sendto: %m"); exit(1); } } break; case TSP_TRACEON: if (!(trace)) { fd = fopen(tracefile, "w"); setlinebuf(fd); fprintf(fd, "Tracing started on: %s\n\n", date()); } trace = ON; break; case TSP_TRACEOFF: if (trace) { fprintf(fd, "Tracing ended on: %s\n", date()); (void)fclose(fd); } #ifdef GPROF moncontrol(0); _mcleanup(); moncontrol(1); #endif trace = OFF; break; case TSP_SLAVEUP: if ((status & MASTER) && fromnet->status == MASTER) { ind = addmach(msg->tsp_name, &from); newslave(ind, msg->tsp_seq); } break; case TSP_ELECTION: if (fromnet->status == SLAVE) { (void)gettimeofday(&time, (struct timezone *)0); electiontime = time.tv_sec + delay2; seq = 0; /* reset sequence number */ if (time.tv_sec < refusetime) msg->tsp_type = TSP_REFUSE; else { msg->tsp_type = TSP_ACCEPT; refusetime = time.tv_sec + 30; } (void)strcpy(candidate, msg->tsp_name); (void)strcpy(msg->tsp_name, hostname); answerdelay(); server = from; answer = acksend(msg, &server, candidate, TSP_ACK, (struct netinfo *)NULL); if (answer == NULL) syslog(LOG_WARNING, "no answer from master candidate\n"); } else { /* fromnet->status == MASTER */ to.tsp_type = TSP_QUIT; (void)strcpy(to.tsp_name, hostname); server = from; answer = acksend(&to, &server, msg->tsp_name, TSP_ACK, (struct netinfo *)NULL); if (answer == NULL) { syslog(LOG_WARNING, "election error: no reply to QUIT"); } else { (void) addmach(msg->tsp_name, &from); } } break; case TSP_CONFLICT: if (fromnet->status != MASTER) break; /* * After a network partition, there can be * more than one master: the first slave to * come up will notify here the situation. */ (void)strcpy(to.tsp_name, hostname); if (fromnet == NULL) break; for(;;) { to.tsp_type = TSP_RESOLVE; answer = acksend(&to, &fromnet->dest_addr, (char *)ANYADDR, TSP_MASTERACK, fromnet); if (answer == NULL) break; to.tsp_type = TSP_QUIT; server = from; msg = acksend(&to, &server, answer->tsp_name, TSP_ACK, (struct netinfo *)NULL); if (msg == NULL) { syslog(LOG_WARNING, "conflict error: no reply to QUIT"); } else { (void) addmach(answer->tsp_name, &from); } } masterup(fromnet); break; case TSP_MSITE: if (!slavenet) break; msaveaddr = from; msg->tsp_type = TSP_MSITEREQ; msg->tsp_vers = TSPVERSION; (void)strcpy(msg->tsp_name, hostname); answer = acksend(msg, &slavenet->dest_addr, (char *)ANYADDR, TSP_ACK, slavenet); if (answer != NULL) { msg->tsp_type = TSP_ACK; length = sizeof(struct sockaddr_in); bytenetorder(msg); if (sendto(sock, (char *)msg, sizeof(struct tsp), 0, &msaveaddr, length) < 0) { syslog(LOG_ERR, "sendto: %m"); exit(1); } } break; case TSP_ACCEPT: case TSP_REFUSE: break; case TSP_RESOLVE: break; case TSP_QUIT: /* become slave */ #ifdef MEASURE if (fp != NULL) { (void)fclose(fp); fp = NULL; } #endif longjmp(jmpenv, 2); break; #ifdef TESTING case TSP_TEST: electiontime = 0; break; #endif case TSP_MSITEREQ: if (status & MASTER) break; if (trace) { fprintf(fd, "garbage: "); print(msg, &from); } break; case TSP_LOOP: /* looking for loops of masters */ if ( !(status & MASTER)) break; if (fromnet->status == SLAVE) { if ( !strcmp(msg->tsp_name, hostname)) { for(;;) { to.tsp_type = TSP_RESOLVE; answer = acksend(&to, &fromnet->dest_addr, (char *)ANYADDR, TSP_MASTERACK, fromnet); if (answer == NULL) break; to.tsp_type = TSP_QUIT; (void)strcpy(to.tsp_name, hostname); server = from; answer = acksend(&to, &server, answer->tsp_name, TSP_ACK, (struct netinfo *)NULL); if (answer == NULL) { syslog(LOG_ERR, "loop kill error"); } else { electiontime = 0; } } } else { if (msg->tsp_hopcnt-- <= 0) break; bytenetorder(msg); ntp = nettab; for (; ntp != NULL; ntp = ntp->next) if (ntp->status == MASTER) if (sendto(sock, (char *)msg, sizeof(struct tsp), 0, &ntp->dest_addr, length) < 0) { syslog(LOG_ERR, "sendto: %m"); exit(1); } } } else { /* * We should not have received this from a net * we are master on. There must be two masters * in this case. */ if (fromnet->my_addr.s_addr == from.sin_addr.s_addr) break; for (;;) { to.tsp_type = TSP_RESOLVE; answer = acksend(&to, &fromnet->dest_addr, (char *)ANYADDR, TSP_MASTERACK, fromnet); if (answer == NULL) break; to.tsp_type = TSP_QUIT; (void)strcpy(to.tsp_name, hostname); server = from; answer = acksend(&to, &server, answer->tsp_name, TSP_ACK, (struct netinfo *)NULL); if (answer == NULL) { syslog(LOG_ERR, "loop kill error2"); } else { (void)addmach(msg->tsp_name, &from); } } } break; default: if (trace) { fprintf(fd, "garbage: "); print(msg, &from); } break; } } goto loop; }