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 1.9 2004/09/05 02:20:15 dillon 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 int
  57 slave(void)
  58 {
  59         int tries;
  60         long electiontime, refusetime, looktime, looptime, adjusttime;
  61         u_short seq;
  62         long fastelection;
  63 #define FASTTOUT 3
  64         struct in_addr cadr;
  65         struct timeval otime;
  66         struct sockaddr_in taddr;
  67         char tname[MAXHOSTNAMELEN];
  68         struct tsp *msg, to;
  69         struct timeval ntime, wait;
  70         time_t tsp_time_sec;
  71         struct tsp *answer;
  72         char olddate[32];
  73         char newdate[32];
  74         struct netinfo *ntp;
  75         struct hosttbl *htp;
  76
  77
  78         old_slavenet = 0;
  79         seq = 0;
  80         refusetime = 0;
  81         adjusttime = 0;
  82
  83         gettimeofday(&ntime, 0);
  84         electiontime = ntime.tv_sec + delay2;
  85         fastelection = ntime.tv_sec + FASTTOUT;
  86         if (justquit)
  87                 looktime = electiontime;
  88         else
  89                 looktime = fastelection;
  90         looptime = fastelection;
  91
  92         if (slavenet)
  93                 xmit(TSP_SLAVEUP, 0, &slavenet->dest_addr);
  94         if (status & MASTER) {
  95                 for (ntp = nettab; ntp != NULL; ntp = ntp->next) {
  96                         if (ntp->status == MASTER)
  97                                 masterup(ntp);
  98                 }
  99         }
 100
 101 loop:
 102         get_goodgroup(0);
 103         gettimeofday(&ntime, NULL);
 104         if (ntime.tv_sec > electiontime) {
 105                 if (trace)
 106                         fprintf(fd, "election timer expired\n");
 107                 longjmp(jmpenv, 1);
 108         }
 109
 110         if (ntime.tv_sec >= looktime) {
 111                 if (trace)
 112                         fprintf(fd, "Looking for nets to master\n");
 113
 114                 if (Mflag && nignorednets > 0) {
 115                         for (ntp = nettab; ntp != NULL; ntp = ntp->next) {
 116                                 if (ntp->status == IGNORE
 117                                     || ntp->status == NOMASTER) {
 118                                         lookformaster(ntp);
 119                                         if (ntp->status == MASTER) {
 120                                                 masterup(ntp);
 121                                         } else if (ntp->status == MASTER) {
 122                                                 ntp->status = NOMASTER;
 123                                         }
 124                                 }
 125                                 if (ntp->status == MASTER
 126                                     && --ntp->quit_count < 0)
 127                                         ntp->quit_count = 0;
 128                         }
 129                         makeslave(slavenet);    /* prune extras */
 130                         setstatus();
 131                 }
 132                 gettimeofday(&ntime, 0);
 133                 looktime = ntime.tv_sec + delay2;
 134         }
 135         if (ntime.tv_sec >= looptime) {
 136                 if (trace)
 137                         fprintf(fd, "Looking for loops\n");
 138                 for (ntp = nettab; ntp != NULL; ntp = ntp->next) {
 139                     if (ntp->status == MASTER) {
 140                         to.tsp_type = TSP_LOOP;
 141                         to.tsp_vers = TSPVERSION;
 142                         to.tsp_seq = sequence++;
 143                         to.tsp_hopcnt = MAX_HOPCNT;
 144                         strlcpy(to.tsp_name, hostname, sizeof(to.tsp_name));
 145                         bytenetorder(&to);
 146                         if (sendto(sock, (char *)&to, sizeof(struct tsp), 0,
 147                                    (struct sockaddr*)&ntp->dest_addr,
 148                                    sizeof(ntp->dest_addr)) < 0) {
 149                                 trace_sendto_err(ntp->dest_addr.sin_addr);
 150                         }
 151                     }
 152                 }
 153                 gettimeofday(&ntime, 0);
 154                 looptime = ntime.tv_sec + delay2;
 155         }
 156
 157         wait.tv_sec = min(electiontime,min(looktime,looptime)) - ntime.tv_sec;
 158         if (wait.tv_sec < 0)
 159                 wait.tv_sec = 0;
 160         wait.tv_sec += FASTTOUT;
 161         wait.tv_usec = 0;
 162         msg = readmsg(TSP_ANY, ANYADDR, &wait, 0);
 163
 164         if (msg != NULL) {
 165                 /*
 166                  * filter stuff not for us
 167                  */
 168                 switch (msg->tsp_type) {
 169                 case TSP_SETDATE:
 170                 case TSP_TRACEOFF:
 171                 case TSP_TRACEON:
 172                         /*
 173                          * XXX check to see they are from ourself
 174                          */
 175                         break;
 176
 177                 case TSP_TEST:
 178                 case TSP_MSITE:
 179                         break;
 180
 181                 case TSP_MASTERUP:
 182                         if (!fromnet) {
 183                                 if (trace) {
 184                                         fprintf(fd, "slave ignored: ");
 185                                         print(msg, &from);
 186                                 }
 187                                 goto loop;
 188                         }
 189                         break;
 190
 191                 default:
 192                         if (!fromnet
 193                             || fromnet->status == IGNORE
 194                             || fromnet->status == NOMASTER) {
 195                                 if (trace) {
 196                                         fprintf(fd, "slave ignored: ");
 197                                         print(msg, &from);
 198                                 }
 199                                 goto loop;
 200                         }
 201                         break;
 202                 }
 203
 204
 205                 /*
 206                  * now process the message
 207                  */
 208                 switch (msg->tsp_type) {
 209
 210                 case TSP_ADJTIME:
 211                         if (fromnet != slavenet)
 212                                 break;
 213                         if (!good_host_name(msg->tsp_name)) {
 214                                 syslog(LOG_NOTICE,
 215                                    "attempted time adjustment by %s",
 216                                        msg->tsp_name);
 217                                 suppress(&from, msg->tsp_name, fromnet);
 218                                 break;
 219                         }
 220                         /*
 221                          * Speed up loop detection in case we have a loop.
 222                          * Otherwise the clocks can race until the loop
 223                          * is found.
 224                          */
 225                         gettimeofday(&otime, 0);
 226                         if (adjusttime < otime.tv_sec)
 227                                 looptime -= (looptime-otime.tv_sec)/2 + 1;
 228
 229                         setmaster(msg);
 230                         if (seq != msg->tsp_seq) {
 231                                 seq = msg->tsp_seq;
 232                                 synch(tvtomsround(msg->tsp_time));
 233                         }
 234                         gettimeofday(&ntime, 0);
 235                         electiontime = ntime.tv_sec + delay2;
 236                         fastelection = ntime.tv_sec + FASTTOUT;
 237                         adjusttime = ntime.tv_sec + SAMPLEINTVL*2;
 238                         break;
 239
 240                 case TSP_SETTIME:
 241                         if (fromnet != slavenet)
 242                                 break;
 243                         if (seq == msg->tsp_seq)
 244                                 break;
 245                         seq = msg->tsp_seq;
 246
 247                         /* adjust time for residence on the queue */
 248                         gettimeofday(&otime, 0);
 249                         adj_msg_time(msg,&otime);
 250
 251                         /*
 252                          * the following line is necessary due to syslog
 253                          * calling ctime() which clobbers the static buffer
 254                          */
 255                         strlcpy(olddate, date(), sizeof(olddate));
 256                         tsp_time_sec = msg->tsp_time.tv_sec;
 257                         strlcpy(newdate, ctime(&tsp_time_sec), sizeof(newdate));
 258
 259                         if (!good_host_name(msg->tsp_name)) {
 260                                 syslog(LOG_NOTICE,
 261                             "attempted time setting by untrusted %s to %s",
 262                                        msg->tsp_name, newdate);
 263                                 suppress(&from, msg->tsp_name, fromnet);
 264                                 break;
 265                         }
 266
 267                         setmaster(msg);
 268                         timevalsub(&ntime, &msg->tsp_time, &otime);
 269                         if (ntime.tv_sec < MAXADJ && ntime.tv_sec > -MAXADJ) {
 270                                 /*
 271                                  * do not change the clock if we can adjust it
 272                                  */
 273                                 synch(tvtomsround(ntime));
 274                         } else {
 275                                 logwtmp("|", "date", "");
 276                                 settimeofday(&msg->tsp_time, 0);
 277                                 logwtmp("{", "date", "");
 278                                 syslog(LOG_NOTICE,
 279                                        "date changed by %s from %s",
 280                                         msg->tsp_name, olddate);
 281                                 if (status & MASTER)
 282                                         spreadtime();
 283                         }
 284                         gettimeofday(&ntime, 0);
 285                         electiontime = ntime.tv_sec + delay2;
 286                         fastelection = ntime.tv_sec + FASTTOUT;
 287
 288 /* This patches a bad protocol bug.  Imagine a system with several networks,
 289  * where there are a pair of redundant gateways between a pair of networks,
 290  * each running timed.  Assume that we start with a third machine mastering
 291  * one of the networks, and one of the gateways mastering the other.
 292  * Imagine that the third machine goes away and the non-master gateway
 293  * decides to replace it.  If things are timed just 'right,' we will have
 294  * each gateway mastering one network for a little while.  If a SETTIME
 295  * message gets into the network at that time, perhaps from the newly
 296  * masterful gateway as it was taking control, the SETTIME will loop
 297  * forever.  Each time a gateway receives it on its slave side, it will
 298  * call spreadtime to forward it on its mastered network.  We are now in
 299  * a permanent loop, since the SETTIME msgs will keep any clock
 300  * in the network from advancing.  Normally, the 'LOOP' stuff will detect
 301  * and correct the situation.  However, with the clocks stopped, the
 302  * 'looptime' timer cannot expire.  While they are in this state, the
 303  * masters will try to saturate the network with SETTIME packets.
 304  */
 305                         looptime = ntime.tv_sec + (looptime-otime.tv_sec)/2-1;
 306                         break;
 307
 308                 case TSP_MASTERUP:
 309                         if (slavenet && fromnet != slavenet)
 310                                 break;
 311                         if (!good_host_name(msg->tsp_name)) {
 312                                 suppress(&from, msg->tsp_name, fromnet);
 313                                 if (electiontime > fastelection)
 314                                         electiontime = fastelection;
 315                                 break;
 316                         }
 317                         makeslave(fromnet);
 318                         setmaster(msg);
 319                         setstatus();
 320                         answerdelay();
 321                         xmit(TSP_SLAVEUP, 0, &from);
 322                         gettimeofday(&ntime, 0);
 323                         electiontime = ntime.tv_sec + delay2;
 324                         fastelection = ntime.tv_sec + FASTTOUT;
 325                         refusetime = 0;
 326                         break;
 327
 328                 case TSP_MASTERREQ:
 329                         if (fromnet->status != SLAVE)
 330                                 break;
 331                         gettimeofday(&ntime, 0);
 332                         electiontime = ntime.tv_sec + delay2;
 333                         break;
 334
 335                 case TSP_SETDATE:
 336                         tsp_time_sec = msg->tsp_time.tv_sec;
 337                         strlcpy(newdate, ctime(&tsp_time_sec), sizeof(newdate));
 338                         schgdate(msg, newdate);
 339                         break;
 340
 341                 case TSP_SETDATEREQ:
 342                         if (fromnet->status != MASTER)
 343                                 break;
 344                         tsp_time_sec = msg->tsp_time.tv_sec;
 345                         strlcpy(newdate, ctime(&tsp_time_sec), sizeof(newdate));
 346                         htp = findhost(msg->tsp_name);
 347                         if (0 == htp) {
 348                                 syslog(LOG_WARNING,
 349                                        "DATEREQ from uncontrolled machine");
 350                                 break;
 351                         }
 352                         if (!htp->good) {
 353                                 syslog(LOG_WARNING,
 354                                 "attempted date change by untrusted %s to %s",
 355                                        htp->name, newdate);
 356                                 spreadtime();
 357                                 break;
 358                         }
 359                         schgdate(msg, newdate);
 360                         break;
 361
 362                 case TSP_TRACEON:
 363                         traceon();
 364                         break;
 365
 366                 case TSP_TRACEOFF:
 367                         traceoff("Tracing ended at %s\n");
 368                         break;
 369
 370                 case TSP_SLAVEUP:
 371                         newslave(msg);
 372                         break;
 373
 374                 case TSP_ELECTION:
 375                         if (fromnet->status == SLAVE) {
 376                                 gettimeofday(&ntime, 0);
 377                                 electiontime = ntime.tv_sec + delay2;
 378                                 fastelection = ntime.tv_sec + FASTTOUT;
 379                                 seq = 0;
 380                                 if (!good_host_name(msg->tsp_name)) {
 381                                         syslog(LOG_NOTICE,
 382                                                "suppress election of %s",
 383                                                msg->tsp_name);
 384                                         to.tsp_type = TSP_QUIT;
 385                                         electiontime = fastelection;
 386                                 } else if (cadr.s_addr != from.sin_addr.s_addr
 387                                            && ntime.tv_sec < refusetime) {
 388 /* if the candidate has to repeat itself, the old code would refuse it
 389  * the second time.  That would prevent elections.
 390  */
 391                                         to.tsp_type = TSP_REFUSE;
 392                                 } else {
 393                                         cadr.s_addr = from.sin_addr.s_addr;
 394                                         to.tsp_type = TSP_ACCEPT;
 395                                         refusetime = ntime.tv_sec + 30;
 396                                 }
 397                                 taddr = from;
 398                                 strlcpy(tname, msg->tsp_name, sizeof(tname));
 399                                 strlcpy(to.tsp_name, hostname,
 400                                         sizeof(to.tsp_name));
 401                                 answerdelay();
 402                                 if (!acksend(&to, &taddr, tname,
 403                                              TSP_ACK, 0, 0))
 404                                         syslog(LOG_WARNING,
 405                                              "no answer from candidate %s\n",
 406                                                tname);
 407
 408                         } else {        /* fromnet->status == MASTER */
 409                                 htp = addmach(msg->tsp_name, &from,fromnet);
 410                                 to.tsp_type = TSP_QUIT;
 411                                 strlcpy(to.tsp_name, hostname,
 412                                         sizeof(to.tsp_name));
 413                                 if (!acksend(&to, &htp->addr, htp->name,
 414                                              TSP_ACK, 0, htp->noanswer)) {
 415                                         syslog(LOG_ERR,
 416                                           "no reply from %s to ELECTION-QUIT",
 417                                                htp->name);
 418                                         remmach(htp);
 419                                 }
 420                         }
 421                         break;
 422
 423                 case TSP_CONFLICT:
 424                         if (fromnet->status != MASTER)
 425                                 break;
 426                         /*
 427                          * After a network partition, there can be
 428                          * more than one master: the first slave to
 429                          * come up will notify here the situation.
 430                          */
 431                         strlcpy(to.tsp_name, hostname, sizeof(to.tsp_name));
 432
 433                         /* The other master often gets into the same state,
 434                          * with boring results.
 435                          */
 436                         ntp = fromnet;  /* (acksend() can leave fromnet=0 */
 437                         for (tries = 0; tries < 3; tries++) {
 438                                 to.tsp_type = TSP_RESOLVE;
 439                                 answer = acksend(&to, &ntp->dest_addr,
 440                                                  ANYADDR, TSP_MASTERACK,
 441                                                  ntp, 0);
 442                                 if (answer == NULL)
 443                                         break;
 444                                 htp = addmach(answer->tsp_name,&from,ntp);
 445                                 to.tsp_type = TSP_QUIT;
 446                                 answer = acksend(&to, &htp->addr, htp->name,
 447                                                  TSP_ACK, 0, htp->noanswer);
 448                                 if (!answer) {
 449                                         syslog(LOG_WARNING,
 450                                   "conflict error: no reply from %s to QUIT",
 451                                                 htp->name);
 452                                         remmach(htp);
 453                                 }
 454                         }
 455                         masterup(ntp);
 456                         break;
 457
 458                 case TSP_MSITE:
 459                         if (!slavenet)
 460                                 break;
 461                         taddr = from;
 462                         to.tsp_type = TSP_MSITEREQ;
 463                         to.tsp_vers = TSPVERSION;
 464                         to.tsp_seq = 0;
 465                         strlcpy(to.tsp_name, hostname, sizeof(to.tsp_name));
 466                         answer = acksend(&to, &slavenet->dest_addr,
 467                                          ANYADDR, TSP_ACK,
 468                                          slavenet, 0);
 469                         if (answer != NULL
 470                             && good_host_name(answer->tsp_name)) {
 471                                 setmaster(answer);
 472                                 to.tsp_type = TSP_ACK;
 473                                 strlcpy(to.tsp_name, answer->tsp_name,
 474                                         sizeof(to.tsp_name));
 475                                 bytenetorder(&to);
 476                                 if (sendto(sock, (char *)&to,
 477                                            sizeof(struct tsp), 0,
 478                                            (struct sockaddr*)&taddr,
 479                                            sizeof(taddr)) < 0) {
 480                                         trace_sendto_err(taddr.sin_addr);
 481                                 }
 482                         }
 483                         break;
 484
 485                 case TSP_MSITEREQ:
 486                         break;
 487
 488                 case TSP_ACCEPT:
 489                 case TSP_REFUSE:
 490                 case TSP_RESOLVE:
 491                         break;
 492
 493                 case TSP_QUIT:
 494                         doquit(msg);            /* become a slave */
 495                         break;
 496
 497                 case TSP_TEST:
 498                         electiontime = 0;
 499                         break;
 500
 501                 case TSP_LOOP:
 502                         /* looking for loops of masters */
 503                         if (!(status & MASTER))
 504                                 break;
 505                         if (fromnet->status == SLAVE) {
 506                             if (!strcmp(msg->tsp_name, hostname)) {
 507                                 /*
 508                                  * Someone forwarded our message back to
 509                                  * us.  There must be a loop.  Tell the
 510                                  * master of this network to quit.
 511                                  *
 512                                  * The other master often gets into
 513                                  * the same state, with boring results.
 514                                  */
 515                                 ntp = fromnet;
 516                                 for (tries = 0; tries < 3; tries++) {
 517                                     to.tsp_type = TSP_RESOLVE;
 518                                     answer = acksend(&to, &ntp->dest_addr,
 519                                                      ANYADDR, TSP_MASTERACK,
 520                                                      ntp,0);
 521                                     if (answer == NULL)
 522                                         break;
 523                                     taddr = from;
 524                                     strlcpy(tname, answer->tsp_name,
 525                                             sizeof(tname));
 526                                     to.tsp_type = TSP_QUIT;
 527                                     strlcpy(to.tsp_name, hostname,
 528                                             sizeof(to.tsp_name));
 529                                     if (!acksend(&to, &taddr, tname,
 530                                                  TSP_ACK, 0, 1)) {
 531                                         syslog(LOG_ERR,
 532                                         "no reply from %s to slave LOOP-QUIT",
 533                                                  tname);
 534                                     } else {
 535                                         electiontime = 0;
 536                                     }
 537                                 }
 538                                 gettimeofday(&ntime, 0);
 539                                 looptime = ntime.tv_sec + FASTTOUT;
 540                             } else {
 541                                 if (msg->tsp_hopcnt-- < 1)
 542                                     break;
 543                                 bytenetorder(msg);
 544                                 for (ntp = nettab; ntp != 0; ntp = ntp->next) {
 545                                     if (ntp->status == MASTER
 546                                         && 0 > sendto(sock, (char *)msg,
 547                                                       sizeof(struct tsp), 0,
 548                                               (struct sockaddr*)&ntp->dest_addr,
 549                                                       sizeof(ntp->dest_addr)))
 550                                     trace_sendto_err(ntp->dest_addr.sin_addr);
 551                                 }
 552                             }
 553                         } else {        /* fromnet->status == MASTER */
 554                             /*
 555                              * We should not have received this from a net
 556                              * we are master on.  There must be two masters,
 557                              * unless the packet was really from us.
 558                              */
 559                             if (from.sin_addr.s_addr
 560                                 == fromnet->my_addr.s_addr) {
 561                                 if (trace)
 562                                     fprintf(fd,"discarding forwarded LOOP\n");
 563                                 break;
 564                             }
 565
 566                             /*
 567                              * The other master often gets into the same
 568                              * state, with boring results.
 569                              */
 570                             ntp = fromnet;
 571                             for (tries = 0; tries < 3; tries++) {
 572                                 to.tsp_type = TSP_RESOLVE;
 573                                 answer = acksend(&to, &ntp->dest_addr,
 574                                                  ANYADDR, TSP_MASTERACK,
 575                                                 ntp,0);
 576                                 if (!answer)
 577                                         break;
 578                                 htp = addmach(answer->tsp_name,
 579                                               &from,ntp);
 580                                 to.tsp_type = TSP_QUIT;
 581                                 strlcpy(to.tsp_name, hostname,
 582                                         sizeof(to.tsp_name));
 583                                 if (!acksend(&to,&htp->addr,htp->name,
 584                                              TSP_ACK, 0, htp->noanswer)) {
 585                                         syslog(LOG_ERR,
 586                                     "no reply from %s to master LOOP-QUIT",
 587                                                htp->name);
 588                                         remmach(htp);
 589                                 }
 590                             }
 591                             gettimeofday(&ntime, 0);
 592                             looptime = ntime.tv_sec + FASTTOUT;
 593                         }
 594                         break;
 595                 default:
 596                         if (trace) {
 597                                 fprintf(fd, "garbage message: ");
 598                                 print(msg, &from);
 599                         }
 600                         break;
 601                 }
 602         }
 603         goto loop;
 604 }
 605
 606
 607 /*
 608  * tell the world who our master is
 609  */
 610 static void
 611 setmaster(struct tsp *msg)
 612 {
 613
 614         if (slavenet
 615             && (slavenet != old_slavenet
 616                 || strcmp(msg->tsp_name, master_name)
 617                 || old_status != status)) {
 618                 strlcpy(master_name, msg->tsp_name, sizeof(master_name));
 619                 old_slavenet = slavenet;
 620                 old_status = status;
 621
 622                 if (status & MASTER) {
 623                         syslog(LOG_NOTICE, "submaster to %s", master_name);
 624                         if (trace)
 625                                 fprintf(fd, "submaster to %s\n", master_name);
 626
 627                 } else {
 628                         syslog(LOG_NOTICE, "slave to %s", master_name);
 629                         if (trace)
 630                                 fprintf(fd, "slave to %s\n", master_name);
 631                 }
 632         }
 633 }
 634
 635
 636
 637 /*
 638  * handle date change request on a slave
 639  */
 640 static void
 641 schgdate(struct tsp *msg, char *newdate)
 642 {
 643         struct tsp to;
 644         u_short seq;
 645         struct sockaddr_in taddr;
 646         struct timeval otime;
 647
 648         if (!slavenet)
 649                 return;                 /* no where to forward */
 650
 651         taddr = from;
 652         seq = msg->tsp_seq;
 653
 654         syslog(LOG_INFO,
 655                "forwarding date change by %s to %s",
 656                msg->tsp_name, newdate);
 657
 658         /* adjust time for residence on the queue */
 659         gettimeofday(&otime, 0);
 660         adj_msg_time(msg, &otime);
 661
 662         to.tsp_type = TSP_SETDATEREQ;
 663         to.tsp_time = msg->tsp_time;
 664         strlcpy(to.tsp_name, hostname, sizeof(to.tsp_name));
 665         if (!acksend(&to, &slavenet->dest_addr,
 666                      ANYADDR, TSP_DATEACK,
 667                      slavenet, 0))
 668                 return;                 /* no answer */
 669
 670         xmit(TSP_DATEACK, seq, &taddr);
 671 }
 672
 673
 674 /*
 675  * Used before answering a broadcast message to avoid network
 676  * contention and likely collisions.
 677  */
 678 static void
 679 answerdelay(void)
 680 {
 681
 682         struct timeval timeout;
 683
 684         timeout.tv_sec = 0;
 685         timeout.tv_usec = delay1;
 686
 687         select(0, (fd_set *)NULL, (fd_set *)NULL, (fd_set *)NULL,
 688                 &timeout);
 689 }