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
  34 #ifndef lint
  35 #if 0
  36 static char sccsid[] = "@(#)slave.c     8.1 (Berkeley) 6/6/93";
  37 #endif
  38 static const char rcsid[] =
  39   "$FreeBSD$";
  40 #endif /* not lint */
  41
  42 #include "globals.h"
  43 #include <setjmp.h>
  44 #include "pathnames.h"
  45
  46 extern jmp_buf jmpenv;
  47 extern int Mflag;
  48 extern int justquit;
  49
  50 extern u_short sequence;
  51
  52 static char master_name[MAXHOSTNAMELEN];
  53 static struct netinfo *old_slavenet;
  54 static int old_status;
  55
  56 static void schgdate(struct tsp *, char *);
  57 static void setmaster(struct tsp *);
  58 static void answerdelay(void);
  59
  60 extern void logwtmp(char *, char *, char *);
  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, tmptv;
  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                         /*
 258                          * the following line is necessary due to syslog
 259                          * calling ctime() which clobbers the static buffer
 260                          */
 261                         (void)strcpy(olddate, date());
 262                         tsp_time_sec = msg->tsp_time.tv_sec;
 263                         (void)strcpy(newdate, ctime(&tsp_time_sec));
 264
 265                         if (!good_host_name(msg->tsp_name)) {
 266                                 syslog(LOG_NOTICE,
 267                             "attempted time setting by untrusted %s to %s",
 268                                        msg->tsp_name, newdate);
 269                                 suppress(&from, msg->tsp_name, fromnet);
 270                                 break;
 271                         }
 272
 273                         setmaster(msg);
 274                         tmptv.tv_sec = msg->tsp_time.tv_sec;
 275                         tmptv.tv_usec = msg->tsp_time.tv_usec;
 276                         timevalsub(&ntime, &tmptv, &otime);
 277                         if (ntime.tv_sec < MAXADJ && ntime.tv_sec > -MAXADJ) {
 278                                 /*
 279                                  * do not change the clock if we can adjust it
 280                                  */
 281                                 synch(tvtomsround(ntime));
 282                         } else {
 283                                 logwtmp("|", "date", "");
 284                                 (void)settimeofday(&tmptv, 0);
 285                                 logwtmp("{", "date", "");
 286                                 syslog(LOG_NOTICE,
 287                                        "date changed by %s from %s",
 288                                         msg->tsp_name, olddate);
 289                                 if (status & MASTER)
 290                                         spreadtime();
 291                         }
 292                         (void)gettimeofday(&ntime, 0);
 293                         electiontime = ntime.tv_sec + delay2;
 294                         fastelection = ntime.tv_sec + FASTTOUT;
 295
 296 /* This patches a bad protocol bug.  Imagine a system with several networks,
 297  * where there are a pair of redundant gateways between a pair of networks,
 298  * each running timed.  Assume that we start with a third machine mastering
 299  * one of the networks, and one of the gateways mastering the other.
 300  * Imagine that the third machine goes away and the non-master gateway
 301  * decides to replace it.  If things are timed just 'right,' we will have
 302  * each gateway mastering one network for a little while.  If a SETTIME
 303  * message gets into the network at that time, perhaps from the newly
 304  * masterful gateway as it was taking control, the SETTIME will loop
 305  * forever.  Each time a gateway receives it on its slave side, it will
 306  * call spreadtime to forward it on its mastered network.  We are now in
 307  * a permanent loop, since the SETTIME msgs will keep any clock
 308  * in the network from advancing.  Normally, the 'LOOP' stuff will detect
 309  * and correct the situation.  However, with the clocks stopped, the
 310  * 'looptime' timer cannot expire.  While they are in this state, the
 311  * masters will try to saturate the network with SETTIME packets.
 312  */
 313                         looptime = ntime.tv_sec + (looptime-otime.tv_sec)/2-1;
 314                         break;
 315
 316                 case TSP_MASTERUP:
 317                         if (slavenet && fromnet != slavenet)
 318                                 break;
 319                         if (!good_host_name(msg->tsp_name)) {
 320                                 suppress(&from, msg->tsp_name, fromnet);
 321                                 if (electiontime > fastelection)
 322                                         electiontime = fastelection;
 323                                 break;
 324                         }
 325                         makeslave(fromnet);
 326                         setmaster(msg);
 327                         setstatus();
 328                         answerdelay();
 329                         xmit(TSP_SLAVEUP, 0, &from);
 330                         (void)gettimeofday(&ntime, 0);
 331                         electiontime = ntime.tv_sec + delay2;
 332                         fastelection = ntime.tv_sec + FASTTOUT;
 333                         refusetime = 0;
 334                         break;
 335
 336                 case TSP_MASTERREQ:
 337                         if (fromnet->status != SLAVE)
 338                                 break;
 339                         (void)gettimeofday(&ntime, 0);
 340                         electiontime = ntime.tv_sec + delay2;
 341                         break;
 342
 343                 case TSP_SETDATE:
 344                         tsp_time_sec = msg->tsp_time.tv_sec;
 345                         (void)strcpy(newdate, ctime(&tsp_time_sec));
 346                         schgdate(msg, newdate);
 347                         break;
 348
 349                 case TSP_SETDATEREQ:
 350                         if (fromnet->status != MASTER)
 351                                 break;
 352                         tsp_time_sec = msg->tsp_time.tv_sec;
 353                         (void)strcpy(newdate, ctime(&tsp_time_sec));
 354                         htp = findhost(msg->tsp_name);
 355                         if (0 == htp) {
 356                                 syslog(LOG_WARNING,
 357                                        "DATEREQ from uncontrolled machine");
 358                                 break;
 359                         }
 360                         if (!htp->good) {
 361                                 syslog(LOG_WARNING,
 362                                 "attempted date change by untrusted %s to %s",
 363                                        htp->name, newdate);
 364                                 spreadtime();
 365                                 break;
 366                         }
 367                         schgdate(msg, newdate);
 368                         break;
 369
 370                 case TSP_TRACEON:
 371                         traceon();
 372                         break;
 373
 374                 case TSP_TRACEOFF:
 375                         traceoff("Tracing ended at %s\n");
 376                         break;
 377
 378                 case TSP_SLAVEUP:
 379                         newslave(msg);
 380                         break;
 381
 382                 case TSP_ELECTION:
 383                         if (fromnet->status == SLAVE) {
 384                                 (void)gettimeofday(&ntime, 0);
 385                                 electiontime = ntime.tv_sec + delay2;
 386                                 fastelection = ntime.tv_sec + FASTTOUT;
 387                                 seq = 0;
 388                                 if (!good_host_name(msg->tsp_name)) {
 389                                         syslog(LOG_NOTICE,
 390                                                "suppress election of %s",
 391                                                msg->tsp_name);
 392                                         to.tsp_type = TSP_QUIT;
 393                                         electiontime = fastelection;
 394                                 } else if (cadr.s_addr != from.sin_addr.s_addr
 395                                            && ntime.tv_sec < refusetime) {
 396 /* if the candidate has to repeat itself, the old code would refuse it
 397  * the second time.  That would prevent elections.
 398  */
 399                                         to.tsp_type = TSP_REFUSE;
 400                                 } else {
 401                                         cadr.s_addr = from.sin_addr.s_addr;
 402                                         to.tsp_type = TSP_ACCEPT;
 403                                         refusetime = ntime.tv_sec + 30;
 404                                 }
 405                                 taddr = from;
 406                                 (void)strcpy(tname, msg->tsp_name);
 407                                 (void)strcpy(to.tsp_name, hostname);
 408                                 answerdelay();
 409                                 if (!acksend(&to, &taddr, tname,
 410                                              TSP_ACK, 0, 0))
 411                                         syslog(LOG_WARNING,
 412                                              "no answer from candidate %s\n",
 413                                                tname);
 414
 415                         } else {        /* fromnet->status == MASTER */
 416                                 htp = addmach(msg->tsp_name, &from,fromnet);
 417                                 to.tsp_type = TSP_QUIT;
 418                                 (void)strcpy(to.tsp_name, hostname);
 419                                 if (!acksend(&to, &htp->addr, htp->name,
 420                                              TSP_ACK, 0, htp->noanswer)) {
 421                                         syslog(LOG_ERR,
 422                                           "no reply from %s to ELECTION-QUIT",
 423                                                htp->name);
 424                                         (void)remmach(htp);
 425                                 }
 426                         }
 427                         break;
 428
 429                 case TSP_CONFLICT:
 430                         if (fromnet->status != MASTER)
 431                                 break;
 432                         /*
 433                          * After a network partition, there can be
 434                          * more than one master: the first slave to
 435                          * come up will notify here the situation.
 436                          */
 437                         (void)strcpy(to.tsp_name, hostname);
 438
 439                         /* The other master often gets into the same state,
 440                          * with boring results.
 441                          */
 442                         ntp = fromnet;  /* (acksend() can leave fromnet=0 */
 443                         for (tries = 0; tries < 3; tries++) {
 444                                 to.tsp_type = TSP_RESOLVE;
 445                                 answer = acksend(&to, &ntp->dest_addr,
 446                                                  ANYADDR, TSP_MASTERACK,
 447                                                  ntp, 0);
 448                                 if (answer == NULL)
 449                                         break;
 450                                 htp = addmach(answer->tsp_name,&from,ntp);
 451                                 to.tsp_type = TSP_QUIT;
 452                                 answer = acksend(&to, &htp->addr, htp->name,
 453                                                  TSP_ACK, 0, htp->noanswer);
 454                                 if (!answer) {
 455                                         syslog(LOG_WARNING,
 456                                   "conflict error: no reply from %s to QUIT",
 457                                                 htp->name);
 458                                         (void)remmach(htp);
 459                                 }
 460                         }
 461                         masterup(ntp);
 462                         break;
 463
 464                 case TSP_MSITE:
 465                         if (!slavenet)
 466                                 break;
 467                         taddr = from;
 468                         to.tsp_type = TSP_MSITEREQ;
 469                         to.tsp_vers = TSPVERSION;
 470                         to.tsp_seq = 0;
 471                         (void)strcpy(to.tsp_name, hostname);
 472                         answer = acksend(&to, &slavenet->dest_addr,
 473                                          ANYADDR, TSP_ACK,
 474                                          slavenet, 0);
 475                         if (answer != NULL
 476                             && good_host_name(answer->tsp_name)) {
 477                                 setmaster(answer);
 478                                 to.tsp_type = TSP_ACK;
 479                                 (void)strcpy(to.tsp_name, answer->tsp_name);
 480                                 bytenetorder(&to);
 481                                 if (sendto(sock, (char *)&to,
 482                                            sizeof(struct tsp), 0,
 483                                            (struct sockaddr*)&taddr,
 484                                            sizeof(taddr)) < 0) {
 485                                         trace_sendto_err(taddr.sin_addr);
 486                                 }
 487                         }
 488                         break;
 489
 490                 case TSP_MSITEREQ:
 491                         break;
 492
 493                 case TSP_ACCEPT:
 494                 case TSP_REFUSE:
 495                 case TSP_RESOLVE:
 496                         break;
 497
 498                 case TSP_QUIT:
 499                         doquit(msg);            /* become a slave */
 500                         break;
 501
 502                 case TSP_TEST:
 503                         electiontime = 0;
 504                         break;
 505
 506                 case TSP_LOOP:
 507                         /* looking for loops of masters */
 508                         if (!(status & MASTER))
 509                                 break;
 510                         if (fromnet->status == SLAVE) {
 511                             if (!strcmp(msg->tsp_name, hostname)) {
 512                                 /*
 513                                  * Someone forwarded our message back to
 514                                  * us.  There must be a loop.  Tell the
 515                                  * master of this network to quit.
 516                                  *
 517                                  * The other master often gets into
 518                                  * the same state, with boring results.
 519                                  */
 520                                 ntp = fromnet;
 521                                 for (tries = 0; tries < 3; tries++) {
 522                                     to.tsp_type = TSP_RESOLVE;
 523                                     answer = acksend(&to, &ntp->dest_addr,
 524                                                      ANYADDR, TSP_MASTERACK,
 525                                                      ntp,0);
 526                                     if (answer == NULL)
 527                                         break;
 528                                     taddr = from;
 529                                     (void)strcpy(tname, answer->tsp_name);
 530                                     to.tsp_type = TSP_QUIT;
 531                                     (void)strcpy(to.tsp_name, hostname);
 532                                     if (!acksend(&to, &taddr, tname,
 533                                                  TSP_ACK, 0, 1)) {
 534                                         syslog(LOG_ERR,
 535                                         "no reply from %s to slave LOOP-QUIT",
 536                                                  tname);
 537                                     } else {
 538                                         electiontime = 0;
 539                                     }
 540                                 }
 541                                 (void)gettimeofday(&ntime, 0);
 542                                 looptime = ntime.tv_sec + FASTTOUT;
 543                             } else {
 544                                 if (msg->tsp_hopcnt-- < 1)
 545                                     break;
 546                                 bytenetorder(msg);
 547                                 for (ntp = nettab; ntp != 0; ntp = ntp->next) {
 548                                     if (ntp->status == MASTER
 549                                         && 0 > sendto(sock, (char *)msg,
 550                                                       sizeof(struct tsp), 0,
 551                                               (struct sockaddr*)&ntp->dest_addr,
 552                                                       sizeof(ntp->dest_addr)))
 553                                     trace_sendto_err(ntp->dest_addr.sin_addr);
 554                                 }
 555                             }
 556                         } else {        /* fromnet->status == MASTER */
 557                             /*
 558                              * We should not have received this from a net
 559                              * we are master on.  There must be two masters,
 560                              * unless the packet was really from us.
 561                              */
 562                             if (from.sin_addr.s_addr
 563                                 == fromnet->my_addr.s_addr) {
 564                                 if (trace)
 565                                     fprintf(fd,"discarding forwarded LOOP\n");
 566                                 break;
 567                             }
 568
 569                             /*
 570                              * The other master often gets into the same
 571                              * state, with boring results.
 572                              */
 573                             ntp = fromnet;
 574                             for (tries = 0; tries < 3; tries++) {
 575                                 to.tsp_type = TSP_RESOLVE;
 576                                 answer = acksend(&to, &ntp->dest_addr,
 577                                                  ANYADDR, TSP_MASTERACK,
 578                                                 ntp,0);
 579                                 if (!answer)
 580                                         break;
 581                                 htp = addmach(answer->tsp_name,
 582                                               &from,ntp);
 583                                 to.tsp_type = TSP_QUIT;
 584                                 (void)strcpy(to.tsp_name, hostname);
 585                                 if (!acksend(&to,&htp->addr,htp->name,
 586                                              TSP_ACK, 0, htp->noanswer)) {
 587                                         syslog(LOG_ERR,
 588                                     "no reply from %s to master LOOP-QUIT",
 589                                                htp->name);
 590                                         (void)remmach(htp);
 591                                 }
 592                             }
 593                             (void)gettimeofday(&ntime, 0);
 594                             looptime = ntime.tv_sec + FASTTOUT;
 595                         }
 596                         break;
 597                 default:
 598                         if (trace) {
 599                                 fprintf(fd, "garbage message: ");
 600                                 print(msg, &from);
 601                         }
 602                         break;
 603                 }
 604         }
 605         goto loop;
 606 }
 607
 608
 609 /*
 610  * tell the world who our master is
 611  */
 612 static void
 613 setmaster(msg)
 614         struct tsp *msg;
 615 {
 616         if (slavenet
 617             && (slavenet != old_slavenet
 618                 || strcmp(msg->tsp_name, master_name)
 619                 || old_status != status)) {
 620                 (void)strcpy(master_name, msg->tsp_name);
 621                 old_slavenet = slavenet;
 622                 old_status = status;
 623
 624                 if (status & MASTER) {
 625                         syslog(LOG_NOTICE, "submaster to %s", master_name);
 626                         if (trace)
 627                                 fprintf(fd, "submaster to %s\n", master_name);
 628
 629                 } else {
 630                         syslog(LOG_NOTICE, "slave to %s", master_name);
 631                         if (trace)
 632                                 fprintf(fd, "slave to %s\n", master_name);
 633                 }
 634         }
 635 }
 636
 637
 638
 639 /*
 640  * handle date change request on a slave
 641  */
 642 static void
 643 schgdate(msg, newdate)
 644         struct tsp *msg;
 645         char *newdate;
 646 {
 647         struct tsp to;
 648         u_short seq;
 649         struct sockaddr_in taddr;
 650         struct timeval otime;
 651
 652         if (!slavenet)
 653                 return;                 /* no where to forward */
 654
 655         taddr = from;
 656         seq = msg->tsp_seq;
 657
 658         syslog(LOG_INFO,
 659                "forwarding date change by %s to %s",
 660                msg->tsp_name, newdate);
 661
 662         /* adjust time for residence on the queue */
 663         (void)gettimeofday(&otime, 0);
 664         adj_msg_time(msg, &otime);
 665
 666         to.tsp_type = TSP_SETDATEREQ;
 667         to.tsp_time = msg->tsp_time;
 668         (void)strcpy(to.tsp_name, hostname);
 669         if (!acksend(&to, &slavenet->dest_addr,
 670                      ANYADDR, TSP_DATEACK,
 671                      slavenet, 0))
 672                 return;                 /* no answer */
 673
 674         xmit(TSP_DATEACK, seq, &taddr);
 675 }
 676
 677
 678 /*
 679  * Used before answering a broadcast message to avoid network
 680  * contention and likely collisions.
 681  */
 682 static void
 683 answerdelay()
 684 {
 685         struct timeval timeout;
 686
 687         timeout.tv_sec = 0;
 688         timeout.tv_usec = delay1;
 689
 690         (void)select(0, (fd_set *)NULL, (fd_set *)NULL, (fd_set *)NULL,
 691             &timeout);
 692         return;
 693 }