usr.sbin/timed/timed/slave.c

   1 /*-
   2  * Copyright (c) 1985, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)slave.c  8.1 (Berkeley) 6/6/93
  34  * $FreeBSD: src/usr.sbin/timed/timed/slave.c,v 1.7 1999/08/28 01:20:18 peter Exp $
  35  * $DragonFly: src/usr.sbin/timed/timed/slave.c,v 1.3 2003/11/03 19:31:43 eirikn Exp $
  36  */
  37
  38 #include "globals.h"
  39 #include <setjmp.h>
  40 #include "pathnames.h"
  41
  42 extern jmp_buf jmpenv;
  43 extern int Mflag;
  44 extern int justquit;
  45
  46 extern u_short sequence;
  47
  48 static char master_name[MAXHOSTNAMELEN];
  49 static struct netinfo *old_slavenet;
  50 static int old_status;
  51
  52 static void schgdate(struct tsp *, char *);
  53 static void setmaster(struct tsp *);
  54 static void answerdelay(void);
  55
  56 #ifdef sgi
  57 extern void logwtmp(struct timeval *, struct timeval *);
  58 #else
  59 extern void logwtmp(char *, char *, char *);
  60 #endif /* sgi */
  61
  62 int
  63 slave()
  64 {
  65         int tries;
  66         long electiontime, refusetime, looktime, looptime, adjtime;
  67         u_short seq;
  68         long fastelection;
  69 #define FASTTOUT 3
  70         struct in_addr cadr;
  71         struct timeval otime;
  72         struct sockaddr_in taddr;
  73         char tname[MAXHOSTNAMELEN];
  74         struct tsp *msg, to;
  75         struct timeval ntime, wait;
  76         time_t tsp_time_sec;
  77         struct tsp *answer;
  78         int timeout();
  79         char olddate[32];
  80         char newdate[32];
  81         struct netinfo *ntp;
  82         struct hosttbl *htp;
  83
  84
  85         old_slavenet = 0;
  86         seq = 0;
  87         refusetime = 0;
  88         adjtime = 0;
  89
  90         (void)gettimeofday(&ntime, 0);
  91         electiontime = ntime.tv_sec + delay2;
  92         fastelection = ntime.tv_sec + FASTTOUT;
  93         if (justquit)
  94                 looktime = electiontime;
  95         else
  96                 looktime = fastelection;
  97         looptime = fastelection;
  98
  99         if (slavenet)
 100                 xmit(TSP_SLAVEUP, 0, &slavenet->dest_addr);
 101         if (status & MASTER) {
 102                 for (ntp = nettab; ntp != NULL; ntp = ntp->next) {
 103                         if (ntp->status == MASTER)
 104                                 masterup(ntp);
 105                 }
 106         }
 107
 108 loop:
 109         get_goodgroup(0);
 110         (void)gettimeofday(&ntime, (struct timezone *)0);
 111         if (ntime.tv_sec > electiontime) {
 112                 if (trace)
 113                         fprintf(fd, "election timer expired\n");
 114                 longjmp(jmpenv, 1);
 115         }
 116
 117         if (ntime.tv_sec >= looktime) {
 118                 if (trace)
 119                         fprintf(fd, "Looking for nets to master\n");
 120
 121                 if (Mflag && nignorednets > 0) {
 122                         for (ntp = nettab; ntp != NULL; ntp = ntp->next) {
 123                                 if (ntp->status == IGNORE
 124                                     || ntp->status == NOMASTER) {
 125                                         lookformaster(ntp);
 126                                         if (ntp->status == MASTER) {
 127                                                 masterup(ntp);
 128                                         } else if (ntp->status == MASTER) {
 129                                                 ntp->status = NOMASTER;
 130                                         }
 131                                 }
 132                                 if (ntp->status == MASTER
 133                                     && --ntp->quit_count < 0)
 134                                         ntp->quit_count = 0;
 135                         }
 136                         makeslave(slavenet);    /* prune extras */
 137                         setstatus();
 138                 }
 139                 (void)gettimeofday(&ntime, 0);
 140                 looktime = ntime.tv_sec + delay2;
 141         }
 142         if (ntime.tv_sec >= looptime) {
 143                 if (trace)
 144                         fprintf(fd, "Looking for loops\n");
 145                 for (ntp = nettab; ntp != NULL; ntp = ntp->next) {
 146                     if (ntp->status == MASTER) {
 147                         to.tsp_type = TSP_LOOP;
 148                         to.tsp_vers = TSPVERSION;
 149                         to.tsp_seq = sequence++;
 150                         to.tsp_hopcnt = MAX_HOPCNT;
 151                         (void)strcpy(to.tsp_name, hostname);
 152                         bytenetorder(&to);
 153                         if (sendto(sock, (char *)&to, sizeof(struct tsp), 0,
 154                                    (struct sockaddr*)&ntp->dest_addr,
 155                                    sizeof(ntp->dest_addr)) < 0) {
 156                                 trace_sendto_err(ntp->dest_addr.sin_addr);
 157                         }
 158                     }
 159                 }
 160                 (void)gettimeofday(&ntime, 0);
 161                 looptime = ntime.tv_sec + delay2;
 162         }
 163
 164         wait.tv_sec = min(electiontime,min(looktime,looptime)) - ntime.tv_sec;
 165         if (wait.tv_sec < 0)
 166                 wait.tv_sec = 0;
 167         wait.tv_sec += FASTTOUT;
 168         wait.tv_usec = 0;
 169         msg = readmsg(TSP_ANY, ANYADDR, &wait, 0);
 170
 171         if (msg != NULL) {
 172                 /*
 173                  * filter stuff not for us
 174                  */
 175                 switch (msg->tsp_type) {
 176                 case TSP_SETDATE:
 177                 case TSP_TRACEOFF:
 178                 case TSP_TRACEON:
 179                         /*
 180                          * XXX check to see they are from ourself
 181                          */
 182                         break;
 183
 184                 case TSP_TEST:
 185                 case TSP_MSITE:
 186                         break;
 187
 188                 case TSP_MASTERUP:
 189                         if (!fromnet) {
 190                                 if (trace) {
 191                                         fprintf(fd, "slave ignored: ");
 192                                         print(msg, &from);
 193                                 }
 194                                 goto loop;
 195                         }
 196                         break;
 197
 198                 default:
 199                         if (!fromnet
 200                             || fromnet->status == IGNORE
 201                             || fromnet->status == NOMASTER) {
 202                                 if (trace) {
 203                                         fprintf(fd, "slave ignored: ");
 204                                         print(msg, &from);
 205                                 }
 206                                 goto loop;
 207                         }
 208                         break;
 209                 }
 210
 211
 212                 /*
 213                  * now process the message
 214                  */
 215                 switch (msg->tsp_type) {
 216
 217                 case TSP_ADJTIME:
 218                         if (fromnet != slavenet)
 219                                 break;
 220                         if (!good_host_name(msg->tsp_name)) {
 221                                 syslog(LOG_NOTICE,
 222                                    "attempted time adjustment by %s",
 223                                        msg->tsp_name);
 224                                 suppress(&from, msg->tsp_name, fromnet);
 225                                 break;
 226                         }
 227                         /*
 228                          * Speed up loop detection in case we have a loop.
 229                          * Otherwise the clocks can race until the loop
 230                          * is found.
 231                          */
 232                         (void)gettimeofday(&otime, 0);
 233                         if (adjtime < otime.tv_sec)
 234                                 looptime -= (looptime-otime.tv_sec)/2 + 1;
 235
 236                         setmaster(msg);
 237                         if (seq != msg->tsp_seq) {
 238                                 seq = msg->tsp_seq;
 239                                 synch(tvtomsround(msg->tsp_time));
 240                         }
 241                         (void)gettimeofday(&ntime, 0);
 242                         electiontime = ntime.tv_sec + delay2;
 243                         fastelection = ntime.tv_sec + FASTTOUT;
 244                         adjtime = ntime.tv_sec + SAMPLEINTVL*2;
 245                         break;
 246
 247                 case TSP_SETTIME:
 248                         if (fromnet != slavenet)
 249                                 break;
 250                         if (seq == msg->tsp_seq)
 251                                 break;
 252                         seq = msg->tsp_seq;
 253
 254                         /* adjust time for residence on the queue */
 255                         (void)gettimeofday(&otime, 0);
 256                         adj_msg_time(msg,&otime);
 257 #ifdef sgi
 258                         (void)cftime(newdate, "%D %T", &msg->tsp_time.tv_sec);
 259                         (void)cftime(olddate, "%D %T", &otime.tv_sec);
 260 #else
 261                         /*
 262                          * the following line is necessary due to syslog
 263                          * calling ctime() which clobbers the static buffer
 264                          */
 265                         (void)strcpy(olddate, date());
 266                         tsp_time_sec = msg->tsp_time.tv_sec;
 267                         (void)strcpy(newdate, ctime(&tsp_time_sec));
 268 #endif /* sgi */
 269
 270                         if (!good_host_name(msg->tsp_name)) {
 271                                 syslog(LOG_NOTICE,
 272                             "attempted time setting by untrusted %s to %s",
 273                                        msg->tsp_name, newdate);
 274                                 suppress(&from, msg->tsp_name, fromnet);
 275                                 break;
 276                         }
 277
 278                         setmaster(msg);
 279                         timevalsub(&ntime, &msg->tsp_time, &otime);
 280                         if (ntime.tv_sec < MAXADJ && ntime.tv_sec > -MAXADJ) {
 281                                 /*
 282                                  * do not change the clock if we can adjust it
 283                                  */
 284                                 synch(tvtomsround(ntime));
 285                         } else {
 286 #ifdef sgi
 287                                 if (0 > settimeofday(&msg->tsp_time, 0)) {
 288                                         syslog(LOG_ERR,"settimeofdate(): %m");
 289                                         break;
 290                                 }
 291                                 logwtmp(&otime, &msg->tsp_time);
 292 #else
 293                                 logwtmp("|", "date", "");
 294                                 (void)settimeofday(&msg->tsp_time, 0);
 295                                 logwtmp("{", "date", "");
 296 #endif /* sgi */
 297                                 syslog(LOG_NOTICE,
 298                                        "date changed by %s from %s",
 299                                         msg->tsp_name, olddate);
 300                                 if (status & MASTER)
 301                                         spreadtime();
 302                         }
 303                         (void)gettimeofday(&ntime, 0);
 304                         electiontime = ntime.tv_sec + delay2;
 305                         fastelection = ntime.tv_sec + FASTTOUT;
 306
 307 /* This patches a bad protocol bug.  Imagine a system with several networks,
 308  * where there are a pair of redundant gateways between a pair of networks,
 309  * each running timed.  Assume that we start with a third machine mastering
 310  * one of the networks, and one of the gateways mastering the other.
 311  * Imagine that the third machine goes away and the non-master gateway
 312  * decides to replace it.  If things are timed just 'right,' we will have
 313  * each gateway mastering one network for a little while.  If a SETTIME
 314  * message gets into the network at that time, perhaps from the newly
 315  * masterful gateway as it was taking control, the SETTIME will loop
 316  * forever.  Each time a gateway receives it on its slave side, it will
 317  * call spreadtime to forward it on its mastered network.  We are now in
 318  * a permanent loop, since the SETTIME msgs will keep any clock
 319  * in the network from advancing.  Normally, the 'LOOP' stuff will detect
 320  * and correct the situation.  However, with the clocks stopped, the
 321  * 'looptime' timer cannot expire.  While they are in this state, the
 322  * masters will try to saturate the network with SETTIME packets.
 323  */
 324                         looptime = ntime.tv_sec + (looptime-otime.tv_sec)/2-1;
 325                         break;
 326
 327                 case TSP_MASTERUP:
 328                         if (slavenet && fromnet != slavenet)
 329                                 break;
 330                         if (!good_host_name(msg->tsp_name)) {
 331                                 suppress(&from, msg->tsp_name, fromnet);
 332                                 if (electiontime > fastelection)
 333                                         electiontime = fastelection;
 334                                 break;
 335                         }
 336                         makeslave(fromnet);
 337                         setmaster(msg);
 338                         setstatus();
 339                         answerdelay();
 340                         xmit(TSP_SLAVEUP, 0, &from);
 341                         (void)gettimeofday(&ntime, 0);
 342                         electiontime = ntime.tv_sec + delay2;
 343                         fastelection = ntime.tv_sec + FASTTOUT;
 344                         refusetime = 0;
 345                         break;
 346
 347                 case TSP_MASTERREQ:
 348                         if (fromnet->status != SLAVE)
 349                                 break;
 350                         (void)gettimeofday(&ntime, 0);
 351                         electiontime = ntime.tv_sec + delay2;
 352                         break;
 353
 354                 case TSP_SETDATE:
 355 #ifdef sgi
 356                         (void)cftime(newdate, "%D %T", &msg->tsp_time.tv_sec);
 357 #else
 358                         tsp_time_sec = msg->tsp_time.tv_sec;
 359                         (void)strcpy(newdate, ctime(&tsp_time_sec));
 360 #endif /* sgi */
 361                         schgdate(msg, newdate);
 362                         break;
 363
 364                 case TSP_SETDATEREQ:
 365                         if (fromnet->status != MASTER)
 366                                 break;
 367 #ifdef sgi
 368                         (void)cftime(newdate, "%D %T", &msg->tsp_time.tv_sec);
 369 #else
 370                         tsp_time_sec = msg->tsp_time.tv_sec;
 371                         (void)strcpy(newdate, ctime(&tsp_time_sec));
 372 #endif /* sgi */
 373                         htp = findhost(msg->tsp_name);
 374                         if (0 == htp) {
 375                                 syslog(LOG_WARNING,
 376                                        "DATEREQ from uncontrolled machine");
 377                                 break;
 378                         }
 379                         if (!htp->good) {
 380                                 syslog(LOG_WARNING,
 381                                 "attempted date change by untrusted %s to %s",
 382                                        htp->name, newdate);
 383                                 spreadtime();
 384                                 break;
 385                         }
 386                         schgdate(msg, newdate);
 387                         break;
 388
 389                 case TSP_TRACEON:
 390                         traceon();
 391                         break;
 392
 393                 case TSP_TRACEOFF:
 394                         traceoff("Tracing ended at %s\n");
 395                         break;
 396
 397                 case TSP_SLAVEUP:
 398                         newslave(msg);
 399                         break;
 400
 401                 case TSP_ELECTION:
 402                         if (fromnet->status == SLAVE) {
 403                                 (void)gettimeofday(&ntime, 0);
 404                                 electiontime = ntime.tv_sec + delay2;
 405                                 fastelection = ntime.tv_sec + FASTTOUT;
 406                                 seq = 0;
 407                                 if (!good_host_name(msg->tsp_name)) {
 408                                         syslog(LOG_NOTICE,
 409                                                "suppress election of %s",
 410                                                msg->tsp_name);
 411                                         to.tsp_type = TSP_QUIT;
 412                                         electiontime = fastelection;
 413                                 } else if (cadr.s_addr != from.sin_addr.s_addr
 414                                            && ntime.tv_sec < refusetime) {
 415 /* if the candidate has to repeat itself, the old code would refuse it
 416  * the second time.  That would prevent elections.
 417  */
 418                                         to.tsp_type = TSP_REFUSE;
 419                                 } else {
 420                                         cadr.s_addr = from.sin_addr.s_addr;
 421                                         to.tsp_type = TSP_ACCEPT;
 422                                         refusetime = ntime.tv_sec + 30;
 423                                 }
 424                                 taddr = from;
 425                                 (void)strcpy(tname, msg->tsp_name);
 426                                 (void)strcpy(to.tsp_name, hostname);
 427                                 answerdelay();
 428                                 if (!acksend(&to, &taddr, tname,
 429                                              TSP_ACK, 0, 0))
 430                                         syslog(LOG_WARNING,
 431                                              "no answer from candidate %s\n",
 432                                                tname);
 433
 434                         } else {        /* fromnet->status == MASTER */
 435                                 htp = addmach(msg->tsp_name, &from,fromnet);
 436                                 to.tsp_type = TSP_QUIT;
 437                                 (void)strcpy(to.tsp_name, hostname);
 438                                 if (!acksend(&to, &htp->addr, htp->name,
 439                                              TSP_ACK, 0, htp->noanswer)) {
 440                                         syslog(LOG_ERR,
 441                                           "no reply from %s to ELECTION-QUIT",
 442                                                htp->name);
 443                                         (void)remmach(htp);
 444                                 }
 445                         }
 446                         break;
 447
 448                 case TSP_CONFLICT:
 449                         if (fromnet->status != MASTER)
 450                                 break;
 451                         /*
 452                          * After a network partition, there can be
 453                          * more than one master: the first slave to
 454                          * come up will notify here the situation.
 455                          */
 456                         (void)strcpy(to.tsp_name, hostname);
 457
 458                         /* The other master often gets into the same state,
 459                          * with boring results.
 460                          */
 461                         ntp = fromnet;  /* (acksend() can leave fromnet=0 */
 462                         for (tries = 0; tries < 3; tries++) {
 463                                 to.tsp_type = TSP_RESOLVE;
 464                                 answer = acksend(&to, &ntp->dest_addr,
 465                                                  ANYADDR, TSP_MASTERACK,
 466                                                  ntp, 0);
 467                                 if (answer == NULL)
 468                                         break;
 469                                 htp = addmach(answer->tsp_name,&from,ntp);
 470                                 to.tsp_type = TSP_QUIT;
 471                                 answer = acksend(&to, &htp->addr, htp->name,
 472                                                  TSP_ACK, 0, htp->noanswer);
 473                                 if (!answer) {
 474                                         syslog(LOG_WARNING,
 475                                   "conflict error: no reply from %s to QUIT",
 476                                                 htp->name);
 477                                         (void)remmach(htp);
 478                                 }
 479                         }
 480                         masterup(ntp);
 481                         break;
 482
 483                 case TSP_MSITE:
 484                         if (!slavenet)
 485                                 break;
 486                         taddr = from;
 487                         to.tsp_type = TSP_MSITEREQ;
 488                         to.tsp_vers = TSPVERSION;
 489                         to.tsp_seq = 0;
 490                         (void)strcpy(to.tsp_name, hostname);
 491                         answer = acksend(&to, &slavenet->dest_addr,
 492                                          ANYADDR, TSP_ACK,
 493                                          slavenet, 0);
 494                         if (answer != NULL
 495                             && good_host_name(answer->tsp_name)) {
 496                                 setmaster(answer);
 497                                 to.tsp_type = TSP_ACK;
 498                                 (void)strcpy(to.tsp_name, answer->tsp_name);
 499                                 bytenetorder(&to);
 500                                 if (sendto(sock, (char *)&to,
 501                                            sizeof(struct tsp), 0,
 502                                            (struct sockaddr*)&taddr,
 503                                            sizeof(taddr)) < 0) {
 504                                         trace_sendto_err(taddr.sin_addr);
 505                                 }
 506                         }
 507                         break;
 508
 509                 case TSP_MSITEREQ:
 510                         break;
 511
 512                 case TSP_ACCEPT:
 513                 case TSP_REFUSE:
 514                 case TSP_RESOLVE:
 515                         break;
 516
 517                 case TSP_QUIT:
 518                         doquit(msg);            /* become a slave */
 519                         break;
 520
 521                 case TSP_TEST:
 522                         electiontime = 0;
 523                         break;
 524
 525                 case TSP_LOOP:
 526                         /* looking for loops of masters */
 527                         if (!(status & MASTER))
 528                                 break;
 529                         if (fromnet->status == SLAVE) {
 530                             if (!strcmp(msg->tsp_name, hostname)) {
 531                                 /*
 532                                  * Someone forwarded our message back to
 533                                  * us.  There must be a loop.  Tell the
 534                                  * master of this network to quit.
 535                                  *
 536                                  * The other master often gets into
 537                                  * the same state, with boring results.
 538                                  */
 539                                 ntp = fromnet;
 540                                 for (tries = 0; tries < 3; tries++) {
 541                                     to.tsp_type = TSP_RESOLVE;
 542                                     answer = acksend(&to, &ntp->dest_addr,
 543                                                      ANYADDR, TSP_MASTERACK,
 544                                                      ntp,0);
 545                                     if (answer == NULL)
 546                                         break;
 547                                     taddr = from;
 548                                     (void)strcpy(tname, answer->tsp_name);
 549                                     to.tsp_type = TSP_QUIT;
 550                                     (void)strcpy(to.tsp_name, hostname);
 551                                     if (!acksend(&to, &taddr, tname,
 552                                                  TSP_ACK, 0, 1)) {
 553                                         syslog(LOG_ERR,
 554                                         "no reply from %s to slave LOOP-QUIT",
 555                                                  tname);
 556                                     } else {
 557                                         electiontime = 0;
 558                                     }
 559                                 }
 560                                 (void)gettimeofday(&ntime, 0);
 561                                 looptime = ntime.tv_sec + FASTTOUT;
 562                             } else {
 563                                 if (msg->tsp_hopcnt-- < 1)
 564                                     break;
 565                                 bytenetorder(msg);
 566                                 for (ntp = nettab; ntp != 0; ntp = ntp->next) {
 567                                     if (ntp->status == MASTER
 568                                         && 0 > sendto(sock, (char *)msg,
 569                                                       sizeof(struct tsp), 0,
 570                                               (struct sockaddr*)&ntp->dest_addr,
 571                                                       sizeof(ntp->dest_addr)))
 572                                     trace_sendto_err(ntp->dest_addr.sin_addr);
 573                                 }
 574                             }
 575                         } else {        /* fromnet->status == MASTER */
 576                             /*
 577                              * We should not have received this from a net
 578                              * we are master on.  There must be two masters,
 579                              * unless the packet was really from us.
 580                              */
 581                             if (from.sin_addr.s_addr
 582                                 == fromnet->my_addr.s_addr) {
 583                                 if (trace)
 584                                     fprintf(fd,"discarding forwarded LOOP\n");
 585                                 break;
 586                             }
 587
 588                             /*
 589                              * The other master often gets into the same
 590                              * state, with boring results.
 591                              */
 592                             ntp = fromnet;
 593                             for (tries = 0; tries < 3; tries++) {
 594                                 to.tsp_type = TSP_RESOLVE;
 595                                 answer = acksend(&to, &ntp->dest_addr,
 596                                                  ANYADDR, TSP_MASTERACK,
 597                                                 ntp,0);
 598                                 if (!answer)
 599                                         break;
 600                                 htp = addmach(answer->tsp_name,
 601                                               &from,ntp);
 602                                 to.tsp_type = TSP_QUIT;
 603                                 (void)strcpy(to.tsp_name, hostname);
 604                                 if (!acksend(&to,&htp->addr,htp->name,
 605                                              TSP_ACK, 0, htp->noanswer)) {
 606                                         syslog(LOG_ERR,
 607                                     "no reply from %s to master LOOP-QUIT",
 608                                                htp->name);
 609                                         (void)remmach(htp);
 610                                 }
 611                             }
 612                             (void)gettimeofday(&ntime, 0);
 613                             looptime = ntime.tv_sec + FASTTOUT;
 614                         }
 615                         break;
 616                 default:
 617                         if (trace) {
 618                                 fprintf(fd, "garbage message: ");
 619                                 print(msg, &from);
 620                         }
 621                         break;
 622                 }
 623         }
 624         goto loop;
 625 }
 626
 627
 628 /*
 629  * tell the world who our master is
 630  */
 631 static void
 632 setmaster(msg)
 633         struct tsp *msg;
 634 {
 635         if (slavenet
 636             && (slavenet != old_slavenet
 637                 || strcmp(msg->tsp_name, master_name)
 638                 || old_status != status)) {
 639                 (void)strcpy(master_name, msg->tsp_name);
 640                 old_slavenet = slavenet;
 641                 old_status = status;
 642
 643                 if (status & MASTER) {
 644                         syslog(LOG_NOTICE, "submaster to %s", master_name);
 645                         if (trace)
 646                                 fprintf(fd, "submaster to %s\n", master_name);
 647
 648                 } else {
 649                         syslog(LOG_NOTICE, "slave to %s", master_name);
 650                         if (trace)
 651                                 fprintf(fd, "slave to %s\n", master_name);
 652                 }
 653         }
 654 }
 655
 656
 657
 658 /*
 659  * handle date change request on a slave
 660  */
 661 static void
 662 schgdate(msg, newdate)
 663         struct tsp *msg;
 664         char *newdate;
 665 {
 666         struct tsp to;
 667         u_short seq;
 668         struct sockaddr_in taddr;
 669         struct timeval otime;
 670
 671         if (!slavenet)
 672                 return;                 /* no where to forward */
 673
 674         taddr = from;
 675         seq = msg->tsp_seq;
 676
 677         syslog(LOG_INFO,
 678                "forwarding date change by %s to %s",
 679                msg->tsp_name, newdate);
 680
 681         /* adjust time for residence on the queue */
 682         (void)gettimeofday(&otime, 0);
 683         adj_msg_time(msg, &otime);
 684
 685         to.tsp_type = TSP_SETDATEREQ;
 686         to.tsp_time = msg->tsp_time;
 687         (void)strcpy(to.tsp_name, hostname);
 688         if (!acksend(&to, &slavenet->dest_addr,
 689                      ANYADDR, TSP_DATEACK,
 690                      slavenet, 0))
 691                 return;                 /* no answer */
 692
 693         xmit(TSP_DATEACK, seq, &taddr);
 694 }
 695
 696
 697 /*
 698  * Used before answering a broadcast message to avoid network
 699  * contention and likely collisions.
 700  */
 701 static void
 702 answerdelay()
 703 {
 704 #ifdef sgi
 705         sginap(delay1);
 706 #else
 707         struct timeval timeout;
 708
 709         timeout.tv_sec = 0;
 710         timeout.tv_usec = delay1;
 711
 712         (void)select(0, (fd_set *)NULL, (fd_set *)NULL, (fd_set *)NULL,
 713             &timeout);
 714         return;
 715 #endif /* sgi */
 716 }