1 /* $NetBSD: dcfd.c,v 1.1.1.1 2009/12/13 16:56:35 kardel Exp $ */ 2 3 /* 4 * /src/NTP/REPOSITORY/ntp4-dev/parseutil/dcfd.c,v 4.18 2005/10/07 22:08:18 kardel RELEASE_20051008_A 5 * 6 * dcfd.c,v 4.18 2005/10/07 22:08:18 kardel RELEASE_20051008_A 7 * 8 * DCF77 100/200ms pulse synchronisation daemon program (via 50Baud serial line) 9 * 10 * Features: 11 * DCF77 decoding 12 * simple NTP loopfilter logic for local clock 13 * interactive display for debugging 14 * 15 * Lacks: 16 * Leap second handling (at that level you should switch to NTP Version 4 - really!) 17 * 18 * Copyright (c) 1995-2005 by Frank Kardel <kardel <AT> ntp.org> 19 * Copyright (c) 1989-1994 by Frank Kardel, Friedrich-Alexander Universit�t Erlangen-N�rnberg, Germany 20 * 21 * Redistribution and use in source and binary forms, with or without 22 * modification, are permitted provided that the following conditions 23 * are met: 24 * 1. Redistributions of source code must retain the above copyright 25 * notice, this list of conditions and the following disclaimer. 26 * 2. Redistributions in binary form must reproduce the above copyright 27 * notice, this list of conditions and the following disclaimer in the 28 * documentation and/or other materials provided with the distribution. 29 * 3. Neither the name of the author nor the names of its contributors 30 * may be used to endorse or promote products derived from this software 31 * without specific prior written permission. 32 * 33 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 34 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 35 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 36 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 37 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 38 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 39 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 40 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 41 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 42 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 43 * SUCH DAMAGE. 44 * 45 */ 46 47 #ifdef HAVE_CONFIG_H 48 # include <config.h> 49 #endif 50 51 #include <sys/ioctl.h> 52 #include <unistd.h> 53 #include <stdio.h> 54 #include <fcntl.h> 55 #include <sys/types.h> 56 #include <sys/time.h> 57 #include <signal.h> 58 #include <syslog.h> 59 #include <time.h> 60 61 /* 62 * NTP compilation environment 63 */ 64 #include "ntp_stdlib.h" 65 #include "ntpd.h" /* indirectly include ntp.h to get YEAR_PIVOT Y2KFixes */ 66 67 /* 68 * select which terminal handling to use (currently only SysV variants) 69 */ 70 #if defined(HAVE_TERMIOS_H) || defined(STREAM) 71 #include <termios.h> 72 #define TTY_GETATTR(_FD_, _ARG_) tcgetattr((_FD_), (_ARG_)) 73 #define TTY_SETATTR(_FD_, _ARG_) tcsetattr((_FD_), TCSANOW, (_ARG_)) 74 #else /* not HAVE_TERMIOS_H || STREAM */ 75 # if defined(HAVE_TERMIO_H) || defined(HAVE_SYSV_TTYS) 76 # include <termio.h> 77 # define TTY_GETATTR(_FD_, _ARG_) ioctl((_FD_), TCGETA, (_ARG_)) 78 # define TTY_SETATTR(_FD_, _ARG_) ioctl((_FD_), TCSETAW, (_ARG_)) 79 # endif/* HAVE_TERMIO_H || HAVE_SYSV_TTYS */ 80 #endif /* not HAVE_TERMIOS_H || STREAM */ 81 82 83 #ifndef TTY_GETATTR 84 #include "Bletch: MUST DEFINE ONE OF 'HAVE_TERMIOS_H' or 'HAVE_TERMIO_H'" 85 #endif 86 87 #ifndef days_per_year 88 #define days_per_year(_x_) (((_x_) % 4) ? 365 : (((_x_) % 400) ? 365 : 366)) 89 #endif 90 91 #define timernormalize(_a_) \ 92 if ((_a_)->tv_usec >= 1000000) \ 93 { \ 94 (_a_)->tv_sec += (_a_)->tv_usec / 1000000; \ 95 (_a_)->tv_usec = (_a_)->tv_usec % 1000000; \ 96 } \ 97 if ((_a_)->tv_usec < 0) \ 98 { \ 99 (_a_)->tv_sec -= 1 + (-(_a_)->tv_usec / 1000000); \ 100 (_a_)->tv_usec = 999999 - (-(_a_)->tv_usec - 1); \ 101 } 102 103 #ifdef timeradd 104 #undef timeradd 105 #endif 106 #define timeradd(_a_, _b_) \ 107 (_a_)->tv_sec += (_b_)->tv_sec; \ 108 (_a_)->tv_usec += (_b_)->tv_usec; \ 109 timernormalize((_a_)) 110 111 #ifdef timersub 112 #undef timersub 113 #endif 114 #define timersub(_a_, _b_) \ 115 (_a_)->tv_sec -= (_b_)->tv_sec; \ 116 (_a_)->tv_usec -= (_b_)->tv_usec; \ 117 timernormalize((_a_)) 118 119 /* 120 * debug macros 121 */ 122 #define PRINTF if (interactive) printf 123 #define LPRINTF if (interactive && loop_filter_debug) printf 124 125 #ifdef DEBUG 126 #define dprintf(_x_) LPRINTF _x_ 127 #else 128 #define dprintf(_x_) 129 #endif 130 131 #ifdef DECL_ERRNO 132 extern int errno; 133 #endif 134 135 static char *revision = "4.18"; 136 137 /* 138 * display received data (avoids also detaching from tty) 139 */ 140 static int interactive = 0; 141 142 /* 143 * display loopfilter (clock control) variables 144 */ 145 static int loop_filter_debug = 0; 146 147 /* 148 * do not set/adjust system time 149 */ 150 static int no_set = 0; 151 152 /* 153 * time that passes between start of DCF impulse and time stamping (fine 154 * adjustment) in microseconds (receiver/OS dependent) 155 */ 156 #define DEFAULT_DELAY 230000 /* rough estimate */ 157 158 /* 159 * The two states we can be in - eithe we receive nothing 160 * usable or we have the correct time 161 */ 162 #define NO_SYNC 0x01 163 #define SYNC 0x02 164 165 static int sync_state = NO_SYNC; 166 static time_t last_sync; 167 168 static unsigned long ticks = 0; 169 170 static char pat[] = "-\\|/"; 171 172 #define LINES (24-2) /* error lines after which the two headlines are repeated */ 173 174 #define MAX_UNSYNC (10*60) /* allow synchronisation loss for 10 minutes */ 175 #define NOTICE_INTERVAL (20*60) /* mention missing synchronisation every 20 minutes */ 176 177 /* 178 * clock adjustment PLL - see NTP protocol spec (RFC1305) for details 179 */ 180 181 #define USECSCALE 10 182 #define TIMECONSTANT 2 183 #define ADJINTERVAL 0 184 #define FREQ_WEIGHT 18 185 #define PHASE_WEIGHT 7 186 #define MAX_DRIFT 0x3FFFFFFF 187 188 #define R_SHIFT(_X_, _Y_) (((_X_) < 0) ? -(-(_X_) >> (_Y_)) : ((_X_) >> (_Y_))) 189 190 static long max_adj_offset_usec = 128000; 191 192 static long clock_adjust = 0; /* current adjustment value (usec * 2^USECSCALE) */ 193 static long accum_drift = 0; /* accumulated drift value (usec / ADJINTERVAL) */ 194 static long adjustments = 0; 195 static char skip_adjust = 1; /* discard first adjustment (bad samples) */ 196 197 /* 198 * DCF77 state flags 199 */ 200 #define DCFB_ANNOUNCE 0x0001 /* switch time zone warning (DST switch) */ 201 #define DCFB_DST 0x0002 /* DST in effect */ 202 #define DCFB_LEAP 0x0004 /* LEAP warning (1 hour prior to occurrence) */ 203 #define DCFB_ALTERNATE 0x0008 /* alternate antenna used */ 204 205 struct clocktime /* clock time broken up from time code */ 206 { 207 long wday; /* Day of week: 1: Monday - 7: Sunday */ 208 long day; 209 long month; 210 long year; 211 long hour; 212 long minute; 213 long second; 214 long usecond; 215 long utcoffset; /* in minutes */ 216 long flags; /* current clock status (DCF77 state flags) */ 217 }; 218 219 typedef struct clocktime clocktime_t; 220 221 /* 222 * (usually) quick constant multiplications 223 */ 224 #define TIMES10(_X_) (((_X_) << 3) + ((_X_) << 1)) /* *8 + *2 */ 225 #define TIMES24(_X_) (((_X_) << 4) + ((_X_) << 3)) /* *16 + *8 */ 226 #define TIMES60(_X_) ((((_X_) << 4) - (_X_)) << 2) /* *(16 - 1) *4 */ 227 /* 228 * generic l_abs() function 229 */ 230 #define l_abs(_x_) (((_x_) < 0) ? -(_x_) : (_x_)) 231 232 /* 233 * conversion related return/error codes 234 */ 235 #define CVT_MASK 0x0000000F /* conversion exit code */ 236 #define CVT_NONE 0x00000001 /* format not applicable */ 237 #define CVT_FAIL 0x00000002 /* conversion failed - error code returned */ 238 #define CVT_OK 0x00000004 /* conversion succeeded */ 239 #define CVT_BADFMT 0x00000010 /* general format error - (unparsable) */ 240 #define CVT_BADDATE 0x00000020 /* invalid date */ 241 #define CVT_BADTIME 0x00000040 /* invalid time */ 242 243 /* 244 * DCF77 raw time code 245 * 246 * From "Zur Zeit", Physikalisch-Technische Bundesanstalt (PTB), Braunschweig 247 * und Berlin, Maerz 1989 248 * 249 * Timecode transmission: 250 * AM: 251 * time marks are send every second except for the second before the 252 * next minute mark 253 * time marks consist of a reduction of transmitter power to 25% 254 * of the nominal level 255 * the falling edge is the time indication (on time) 256 * time marks of a 100ms duration constitute a logical 0 257 * time marks of a 200ms duration constitute a logical 1 258 * FM: 259 * see the spec. (basically a (non-)inverted psuedo random phase shift) 260 * 261 * Encoding: 262 * Second Contents 263 * 0 - 10 AM: free, FM: 0 264 * 11 - 14 free 265 * 15 R - alternate antenna 266 * 16 A1 - expect zone change (1 hour before) 267 * 17 - 18 Z1,Z2 - time zone 268 * 0 0 illegal 269 * 0 1 MEZ (MET) 270 * 1 0 MESZ (MED, MET DST) 271 * 1 1 illegal 272 * 19 A2 - expect leap insertion/deletion (1 hour before) 273 * 20 S - start of time code (1) 274 * 21 - 24 M1 - BCD (lsb first) Minutes 275 * 25 - 27 M10 - BCD (lsb first) 10 Minutes 276 * 28 P1 - Minute Parity (even) 277 * 29 - 32 H1 - BCD (lsb first) Hours 278 * 33 - 34 H10 - BCD (lsb first) 10 Hours 279 * 35 P2 - Hour Parity (even) 280 * 36 - 39 D1 - BCD (lsb first) Days 281 * 40 - 41 D10 - BCD (lsb first) 10 Days 282 * 42 - 44 DW - BCD (lsb first) day of week (1: Monday -> 7: Sunday) 283 * 45 - 49 MO - BCD (lsb first) Month 284 * 50 MO0 - 10 Months 285 * 51 - 53 Y1 - BCD (lsb first) Years 286 * 54 - 57 Y10 - BCD (lsb first) 10 Years 287 * 58 P3 - Date Parity (even) 288 * 59 - usually missing (minute indication), except for leap insertion 289 */ 290 291 /*----------------------------------------------------------------------- 292 * conversion table to map DCF77 bit stream into data fields. 293 * Encoding: 294 * Each field of the DCF77 code is described with two adjacent entries in 295 * this table. The first entry specifies the offset into the DCF77 data stream 296 * while the length is given as the difference between the start index and 297 * the start index of the following field. 298 */ 299 static struct rawdcfcode 300 { 301 char offset; /* start bit */ 302 } rawdcfcode[] = 303 { 304 { 0 }, { 15 }, { 16 }, { 17 }, { 19 }, { 20 }, { 21 }, { 25 }, { 28 }, { 29 }, 305 { 33 }, { 35 }, { 36 }, { 40 }, { 42 }, { 45 }, { 49 }, { 50 }, { 54 }, { 58 }, { 59 } 306 }; 307 308 /*----------------------------------------------------------------------- 309 * symbolic names for the fields of DCF77 describes in "rawdcfcode". 310 * see comment above for the structure of the DCF77 data 311 */ 312 #define DCF_M 0 313 #define DCF_R 1 314 #define DCF_A1 2 315 #define DCF_Z 3 316 #define DCF_A2 4 317 #define DCF_S 5 318 #define DCF_M1 6 319 #define DCF_M10 7 320 #define DCF_P1 8 321 #define DCF_H1 9 322 #define DCF_H10 10 323 #define DCF_P2 11 324 #define DCF_D1 12 325 #define DCF_D10 13 326 #define DCF_DW 14 327 #define DCF_MO 15 328 #define DCF_MO0 16 329 #define DCF_Y1 17 330 #define DCF_Y10 18 331 #define DCF_P3 19 332 333 /*----------------------------------------------------------------------- 334 * parity field table (same encoding as rawdcfcode) 335 * This table describes the sections of the DCF77 code that are 336 * parity protected 337 */ 338 static struct partab 339 { 340 char offset; /* start bit of parity field */ 341 } partab[] = 342 { 343 { 21 }, { 29 }, { 36 }, { 59 } 344 }; 345 346 /*----------------------------------------------------------------------- 347 * offsets for parity field descriptions 348 */ 349 #define DCF_P_P1 0 350 #define DCF_P_P2 1 351 #define DCF_P_P3 2 352 353 /*----------------------------------------------------------------------- 354 * legal values for time zone information 355 */ 356 #define DCF_Z_MET 0x2 357 #define DCF_Z_MED 0x1 358 359 /*----------------------------------------------------------------------- 360 * symbolic representation if the DCF77 data stream 361 */ 362 static struct dcfparam 363 { 364 unsigned char onebits[60]; 365 unsigned char zerobits[60]; 366 } dcfparam = 367 { 368 "###############RADMLS1248124P124812P1248121241248112481248P", /* 'ONE' representation */ 369 "--------------------s-------p------p----------------------p" /* 'ZERO' representation */ 370 }; 371 372 /*----------------------------------------------------------------------- 373 * extract a bitfield from DCF77 datastream 374 * All numeric fields are LSB first. 375 * buf holds a pointer to a DCF77 data buffer in symbolic 376 * representation 377 * idx holds the index to the field description in rawdcfcode 378 */ 379 static unsigned long 380 ext_bf( 381 register unsigned char *buf, 382 register int idx 383 ) 384 { 385 register unsigned long sum = 0; 386 register int i, first; 387 388 first = rawdcfcode[idx].offset; 389 390 for (i = rawdcfcode[idx+1].offset - 1; i >= first; i--) 391 { 392 sum <<= 1; 393 sum |= (buf[i] != dcfparam.zerobits[i]); 394 } 395 return sum; 396 } 397 398 /*----------------------------------------------------------------------- 399 * check even parity integrity for a bitfield 400 * 401 * buf holds a pointer to a DCF77 data buffer in symbolic 402 * representation 403 * idx holds the index to the field description in partab 404 */ 405 static unsigned 406 pcheck( 407 register unsigned char *buf, 408 register int idx 409 ) 410 { 411 register int i,last; 412 register unsigned psum = 1; 413 414 last = partab[idx+1].offset; 415 416 for (i = partab[idx].offset; i < last; i++) 417 psum ^= (buf[i] != dcfparam.zerobits[i]); 418 419 return psum; 420 } 421 422 /*----------------------------------------------------------------------- 423 * convert a DCF77 data buffer into wall clock time + flags 424 * 425 * buffer holds a pointer to a DCF77 data buffer in symbolic 426 * representation 427 * size describes the length of DCF77 information in bits (represented 428 * as chars in symbolic notation 429 * clock points to a wall clock time description of the DCF77 data (result) 430 */ 431 static unsigned long 432 convert_rawdcf( 433 unsigned char *buffer, 434 int size, 435 clocktime_t *clock_time 436 ) 437 { 438 if (size < 57) 439 { 440 PRINTF("%-30s", "*** INCOMPLETE"); 441 return CVT_NONE; 442 } 443 444 /* 445 * check Start and Parity bits 446 */ 447 if ((ext_bf(buffer, DCF_S) == 1) && 448 pcheck(buffer, DCF_P_P1) && 449 pcheck(buffer, DCF_P_P2) && 450 pcheck(buffer, DCF_P_P3)) 451 { 452 /* 453 * buffer OK - extract all fields and build wall clock time from them 454 */ 455 456 clock_time->flags = 0; 457 clock_time->usecond= 0; 458 clock_time->second = 0; 459 clock_time->minute = ext_bf(buffer, DCF_M10); 460 clock_time->minute = TIMES10(clock_time->minute) + ext_bf(buffer, DCF_M1); 461 clock_time->hour = ext_bf(buffer, DCF_H10); 462 clock_time->hour = TIMES10(clock_time->hour) + ext_bf(buffer, DCF_H1); 463 clock_time->day = ext_bf(buffer, DCF_D10); 464 clock_time->day = TIMES10(clock_time->day) + ext_bf(buffer, DCF_D1); 465 clock_time->month = ext_bf(buffer, DCF_MO0); 466 clock_time->month = TIMES10(clock_time->month) + ext_bf(buffer, DCF_MO); 467 clock_time->year = ext_bf(buffer, DCF_Y10); 468 clock_time->year = TIMES10(clock_time->year) + ext_bf(buffer, DCF_Y1); 469 clock_time->wday = ext_bf(buffer, DCF_DW); 470 471 /* 472 * determine offset to UTC by examining the time zone 473 */ 474 switch (ext_bf(buffer, DCF_Z)) 475 { 476 case DCF_Z_MET: 477 clock_time->utcoffset = -60; 478 break; 479 480 case DCF_Z_MED: 481 clock_time->flags |= DCFB_DST; 482 clock_time->utcoffset = -120; 483 break; 484 485 default: 486 PRINTF("%-30s", "*** BAD TIME ZONE"); 487 return CVT_FAIL|CVT_BADFMT; 488 } 489 490 /* 491 * extract various warnings from DCF77 492 */ 493 if (ext_bf(buffer, DCF_A1)) 494 clock_time->flags |= DCFB_ANNOUNCE; 495 496 if (ext_bf(buffer, DCF_A2)) 497 clock_time->flags |= DCFB_LEAP; 498 499 if (ext_bf(buffer, DCF_R)) 500 clock_time->flags |= DCFB_ALTERNATE; 501 502 return CVT_OK; 503 } 504 else 505 { 506 /* 507 * bad format - not for us 508 */ 509 PRINTF("%-30s", "*** BAD FORMAT (invalid/parity)"); 510 return CVT_FAIL|CVT_BADFMT; 511 } 512 } 513 514 /*----------------------------------------------------------------------- 515 * raw dcf input routine - fix up 50 baud 516 * characters for 1/0 decision 517 */ 518 static unsigned long 519 cvt_rawdcf( 520 unsigned char *buffer, 521 int size, 522 clocktime_t *clock_time 523 ) 524 { 525 register unsigned char *s = buffer; 526 register unsigned char *e = buffer + size; 527 register unsigned char *b = dcfparam.onebits; 528 register unsigned char *c = dcfparam.zerobits; 529 register unsigned rtc = CVT_NONE; 530 register unsigned int i, lowmax, highmax, cutoff, span; 531 #define BITS 9 532 unsigned char histbuf[BITS]; 533 /* 534 * the input buffer contains characters with runs of consecutive 535 * bits set. These set bits are an indication of the DCF77 pulse 536 * length. We assume that we receive the pulse at 50 Baud. Thus 537 * a 100ms pulse would generate a 4 bit train (20ms per bit and 538 * start bit) 539 * a 200ms pulse would create all zeroes (and probably a frame error) 540 * 541 * The basic idea is that on corret reception we must have two 542 * maxima in the pulse length distribution histogram. (one for 543 * the zero representing pulses and one for the one representing 544 * pulses) 545 * There will always be ones in the datastream, thus we have to see 546 * two maxima. 547 * The best point to cut for a 1/0 decision is the minimum between those 548 * between the maxima. The following code tries to find this cutoff point. 549 */ 550 551 /* 552 * clear histogram buffer 553 */ 554 for (i = 0; i < BITS; i++) 555 { 556 histbuf[i] = 0; 557 } 558 559 cutoff = 0; 560 lowmax = 0; 561 562 /* 563 * convert sequences of set bits into bits counts updating 564 * the histogram alongway 565 */ 566 while (s < e) 567 { 568 register unsigned int ch = *s ^ 0xFF; 569 /* 570 * check integrity and update histogramm 571 */ 572 if (!((ch+1) & ch) || !*s) 573 { 574 /* 575 * character ok 576 */ 577 for (i = 0; ch; i++) 578 { 579 ch >>= 1; 580 } 581 582 *s = i; 583 histbuf[i]++; 584 cutoff += i; 585 lowmax++; 586 } 587 else 588 { 589 /* 590 * invalid character (no consecutive bit sequence) 591 */ 592 dprintf(("parse: cvt_rawdcf: character check for 0x%x@%d FAILED\n", *s, s - buffer)); 593 *s = (unsigned char)~0; 594 rtc = CVT_FAIL|CVT_BADFMT; 595 } 596 s++; 597 } 598 599 /* 600 * first cutoff estimate (average bit count - must be between both 601 * maxima) 602 */ 603 if (lowmax) 604 { 605 cutoff /= lowmax; 606 } 607 else 608 { 609 cutoff = 4; /* doesn't really matter - it'll fail anyway, but gives error output */ 610 } 611 612 dprintf(("parse: cvt_rawdcf: average bit count: %d\n", cutoff)); 613 614 lowmax = 0; /* weighted sum */ 615 highmax = 0; /* bitcount */ 616 617 /* 618 * collect weighted sum of lower bits (left of initial guess) 619 */ 620 dprintf(("parse: cvt_rawdcf: histogram:")); 621 for (i = 0; i <= cutoff; i++) 622 { 623 lowmax += histbuf[i] * i; 624 highmax += histbuf[i]; 625 dprintf((" %d", histbuf[i])); 626 } 627 dprintf((" <M>")); 628 629 /* 630 * round up 631 */ 632 lowmax += highmax / 2; 633 634 /* 635 * calculate lower bit maximum (weighted sum / bit count) 636 * 637 * avoid divide by zero 638 */ 639 if (highmax) 640 { 641 lowmax /= highmax; 642 } 643 else 644 { 645 lowmax = 0; 646 } 647 648 highmax = 0; /* weighted sum of upper bits counts */ 649 cutoff = 0; /* bitcount */ 650 651 /* 652 * collect weighted sum of lower bits (right of initial guess) 653 */ 654 for (; i < BITS; i++) 655 { 656 highmax+=histbuf[i] * i; 657 cutoff +=histbuf[i]; 658 dprintf((" %d", histbuf[i])); 659 } 660 dprintf(("\n")); 661 662 /* 663 * determine upper maximum (weighted sum / bit count) 664 */ 665 if (cutoff) 666 { 667 highmax /= cutoff; 668 } 669 else 670 { 671 highmax = BITS-1; 672 } 673 674 /* 675 * following now holds: 676 * lowmax <= cutoff(initial guess) <= highmax 677 * best cutoff is the minimum nearest to higher bits 678 */ 679 680 /* 681 * find the minimum between lowmax and highmax (detecting 682 * possibly a minimum span) 683 */ 684 span = cutoff = lowmax; 685 for (i = lowmax; i <= highmax; i++) 686 { 687 if (histbuf[cutoff] > histbuf[i]) 688 { 689 /* 690 * got a new minimum move beginning of minimum (cutoff) and 691 * end of minimum (span) there 692 */ 693 cutoff = span = i; 694 } 695 else 696 if (histbuf[cutoff] == histbuf[i]) 697 { 698 /* 699 * minimum not better yet - but it spans more than 700 * one bit value - follow it 701 */ 702 span = i; 703 } 704 } 705 706 /* 707 * cutoff point for 1/0 decision is the middle of the minimum section 708 * in the histogram 709 */ 710 cutoff = (cutoff + span) / 2; 711 712 dprintf(("parse: cvt_rawdcf: lower maximum %d, higher maximum %d, cutoff %d\n", lowmax, highmax, cutoff)); 713 714 /* 715 * convert the bit counts to symbolic 1/0 information for data conversion 716 */ 717 s = buffer; 718 while ((s < e) && *c && *b) 719 { 720 if (*s == (unsigned char)~0) 721 { 722 /* 723 * invalid character 724 */ 725 *s = '?'; 726 } 727 else 728 { 729 /* 730 * symbolic 1/0 representation 731 */ 732 *s = (*s >= cutoff) ? *b : *c; 733 } 734 s++; 735 b++; 736 c++; 737 } 738 739 /* 740 * if everything went well so far return the result of the symbolic 741 * conversion routine else just the accumulated errors 742 */ 743 if (rtc != CVT_NONE) 744 { 745 PRINTF("%-30s", "*** BAD DATA"); 746 } 747 748 return (rtc == CVT_NONE) ? convert_rawdcf(buffer, size, clock_time) : rtc; 749 } 750 751 /*----------------------------------------------------------------------- 752 * convert a wall clock time description of DCF77 to a Unix time (seconds 753 * since 1.1. 1970 UTC) 754 */ 755 static time_t 756 dcf_to_unixtime( 757 clocktime_t *clock_time, 758 unsigned *cvtrtc 759 ) 760 { 761 #define SETRTC(_X_) { if (cvtrtc) *cvtrtc = (_X_); } 762 static int days_of_month[] = 763 { 764 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 765 }; 766 register int i; 767 time_t t; 768 769 /* 770 * map 2 digit years to 19xx (DCF77 is a 20th century item) 771 */ 772 if ( clock_time->year < YEAR_PIVOT ) /* in case of Y2KFixes [ */ 773 clock_time->year += 100; /* *year%100, make tm_year */ 774 /* *(do we need this?) */ 775 if ( clock_time->year < YEAR_BREAK ) /* (failsafe if) */ 776 clock_time->year += 1900; /* Y2KFixes ] */ 777 778 /* 779 * must have been a really bad year code - drop it 780 */ 781 if (clock_time->year < (YEAR_PIVOT + 1900) ) /* Y2KFixes */ 782 { 783 SETRTC(CVT_FAIL|CVT_BADDATE); 784 return -1; 785 } 786 /* 787 * sorry, slow section here - but it's not time critical anyway 788 */ 789 790 /* 791 * calculate days since 1970 (watching leap years) 792 */ 793 t = julian0( clock_time->year ) - julian0( 1970 ); 794 795 /* month */ 796 if (clock_time->month <= 0 || clock_time->month > 12) 797 { 798 SETRTC(CVT_FAIL|CVT_BADDATE); 799 return -1; /* bad month */ 800 } 801 /* adjust current leap year */ 802 #if 0 803 if (clock_time->month < 3 && days_per_year(clock_time->year) == 366) 804 t--; 805 #endif 806 807 /* 808 * collect days from months excluding the current one 809 */ 810 for (i = 1; i < clock_time->month; i++) 811 { 812 t += days_of_month[i]; 813 } 814 /* day */ 815 if (clock_time->day < 1 || ((clock_time->month == 2 && days_per_year(clock_time->year) == 366) ? 816 clock_time->day > 29 : clock_time->day > days_of_month[clock_time->month])) 817 { 818 SETRTC(CVT_FAIL|CVT_BADDATE); 819 return -1; /* bad day */ 820 } 821 822 /* 823 * collect days from date excluding the current one 824 */ 825 t += clock_time->day - 1; 826 827 /* hour */ 828 if (clock_time->hour < 0 || clock_time->hour >= 24) 829 { 830 SETRTC(CVT_FAIL|CVT_BADTIME); 831 return -1; /* bad hour */ 832 } 833 834 /* 835 * calculate hours from 1. 1. 1970 836 */ 837 t = TIMES24(t) + clock_time->hour; 838 839 /* min */ 840 if (clock_time->minute < 0 || clock_time->minute > 59) 841 { 842 SETRTC(CVT_FAIL|CVT_BADTIME); 843 return -1; /* bad min */ 844 } 845 846 /* 847 * calculate minutes from 1. 1. 1970 848 */ 849 t = TIMES60(t) + clock_time->minute; 850 /* sec */ 851 852 /* 853 * calculate UTC in minutes 854 */ 855 t += clock_time->utcoffset; 856 857 if (clock_time->second < 0 || clock_time->second > 60) /* allow for LEAPs */ 858 { 859 SETRTC(CVT_FAIL|CVT_BADTIME); 860 return -1; /* bad sec */ 861 } 862 863 /* 864 * calculate UTC in seconds - phew ! 865 */ 866 t = TIMES60(t) + clock_time->second; 867 /* done */ 868 return t; 869 } 870 871 /*----------------------------------------------------------------------- 872 * cheap half baked 1/0 decision - for interactive operation only 873 */ 874 static char 875 type( 876 unsigned int c 877 ) 878 { 879 c ^= 0xFF; 880 return (c > 0xF); 881 } 882 883 /*----------------------------------------------------------------------- 884 * week day representation 885 */ 886 static const char *wday[8] = 887 { 888 "??", 889 "Mo", 890 "Tu", 891 "We", 892 "Th", 893 "Fr", 894 "Sa", 895 "Su" 896 }; 897 898 /*----------------------------------------------------------------------- 899 * generate a string representation for a timeval 900 */ 901 static char * 902 pr_timeval( 903 struct timeval *val 904 ) 905 { 906 static char buf[20]; 907 908 if (val->tv_sec == 0) 909 sprintf(buf, "%c0.%06ld", (val->tv_usec < 0) ? '-' : '+', (long int)l_abs(val->tv_usec)); 910 else 911 sprintf(buf, "%ld.%06ld", (long int)val->tv_sec, (long int)l_abs(val->tv_usec)); 912 return buf; 913 } 914 915 /*----------------------------------------------------------------------- 916 * correct the current time by an offset by setting the time rigorously 917 */ 918 static void 919 set_time( 920 struct timeval *offset 921 ) 922 { 923 struct timeval the_time; 924 925 if (no_set) 926 return; 927 928 LPRINTF("set_time: %s ", pr_timeval(offset)); 929 syslog(LOG_NOTICE, "setting time (offset %s)", pr_timeval(offset)); 930 931 if (gettimeofday(&the_time, 0L) == -1) 932 { 933 perror("gettimeofday()"); 934 } 935 else 936 { 937 timeradd(&the_time, offset); 938 if (settimeofday(&the_time, 0L) == -1) 939 { 940 perror("settimeofday()"); 941 } 942 } 943 } 944 945 /*----------------------------------------------------------------------- 946 * slew the time by a given offset 947 */ 948 static void 949 adj_time( 950 long offset 951 ) 952 { 953 struct timeval time_offset; 954 955 if (no_set) 956 return; 957 958 time_offset.tv_sec = offset / 1000000; 959 time_offset.tv_usec = offset % 1000000; 960 961 LPRINTF("adj_time: %ld us ", (long int)offset); 962 if (adjtime(&time_offset, 0L) == -1) 963 perror("adjtime()"); 964 } 965 966 /*----------------------------------------------------------------------- 967 * read in a possibly previously written drift value 968 */ 969 static void 970 read_drift( 971 const char *drift_file 972 ) 973 { 974 FILE *df; 975 976 df = fopen(drift_file, "r"); 977 if (df != NULL) 978 { 979 int idrift = 0, fdrift = 0; 980 981 fscanf(df, "%4d.%03d", &idrift, &fdrift); 982 fclose(df); 983 LPRINTF("read_drift: %d.%03d ppm ", idrift, fdrift); 984 985 accum_drift = idrift << USECSCALE; 986 fdrift = (fdrift << USECSCALE) / 1000; 987 accum_drift += fdrift & (1<<USECSCALE); 988 LPRINTF("read_drift: drift_comp %ld ", (long int)accum_drift); 989 } 990 } 991 992 /*----------------------------------------------------------------------- 993 * write out the current drift value 994 */ 995 static void 996 update_drift( 997 const char *drift_file, 998 long offset, 999 time_t reftime 1000 ) 1001 { 1002 FILE *df; 1003 1004 df = fopen(drift_file, "w"); 1005 if (df != NULL) 1006 { 1007 int idrift = R_SHIFT(accum_drift, USECSCALE); 1008 int fdrift = accum_drift & ((1<<USECSCALE)-1); 1009 1010 LPRINTF("update_drift: drift_comp %ld ", (long int)accum_drift); 1011 fdrift = (fdrift * 1000) / (1<<USECSCALE); 1012 fprintf(df, "%4d.%03d %c%ld.%06ld %.24s\n", idrift, fdrift, 1013 (offset < 0) ? '-' : '+', (long int)(l_abs(offset) / 1000000), 1014 (long int)(l_abs(offset) % 1000000), asctime(localtime(&reftime))); 1015 fclose(df); 1016 LPRINTF("update_drift: %d.%03d ppm ", idrift, fdrift); 1017 } 1018 } 1019 1020 /*----------------------------------------------------------------------- 1021 * process adjustments derived from the DCF77 observation 1022 * (controls clock PLL) 1023 */ 1024 static void 1025 adjust_clock( 1026 struct timeval *offset, 1027 const char *drift_file, 1028 time_t reftime 1029 ) 1030 { 1031 struct timeval toffset; 1032 register long usecoffset; 1033 int tmp; 1034 1035 if (no_set) 1036 return; 1037 1038 if (skip_adjust) 1039 { 1040 skip_adjust = 0; 1041 return; 1042 } 1043 1044 toffset = *offset; 1045 toffset.tv_sec = l_abs(toffset.tv_sec); 1046 toffset.tv_usec = l_abs(toffset.tv_usec); 1047 if (toffset.tv_sec || 1048 (!toffset.tv_sec && toffset.tv_usec > max_adj_offset_usec)) 1049 { 1050 /* 1051 * hopeless - set the clock - and clear the timing 1052 */ 1053 set_time(offset); 1054 clock_adjust = 0; 1055 skip_adjust = 1; 1056 return; 1057 } 1058 1059 usecoffset = offset->tv_sec * 1000000 + offset->tv_usec; 1060 1061 clock_adjust = R_SHIFT(usecoffset, TIMECONSTANT); /* adjustment to make for next period */ 1062 1063 tmp = 0; 1064 while (adjustments > (1 << tmp)) 1065 tmp++; 1066 adjustments = 0; 1067 if (tmp > FREQ_WEIGHT) 1068 tmp = FREQ_WEIGHT; 1069 1070 accum_drift += R_SHIFT(usecoffset << USECSCALE, TIMECONSTANT+TIMECONSTANT+FREQ_WEIGHT-tmp); 1071 1072 if (accum_drift > MAX_DRIFT) /* clamp into interval */ 1073 accum_drift = MAX_DRIFT; 1074 else 1075 if (accum_drift < -MAX_DRIFT) 1076 accum_drift = -MAX_DRIFT; 1077 1078 update_drift(drift_file, usecoffset, reftime); 1079 LPRINTF("clock_adjust: %s, clock_adjust %ld, drift_comp %ld(%ld) ", 1080 pr_timeval(offset),(long int) R_SHIFT(clock_adjust, USECSCALE), 1081 (long int)R_SHIFT(accum_drift, USECSCALE), (long int)accum_drift); 1082 } 1083 1084 /*----------------------------------------------------------------------- 1085 * adjust the clock by a small mount to simulate frequency correction 1086 */ 1087 static void 1088 periodic_adjust( 1089 void 1090 ) 1091 { 1092 register long adjustment; 1093 1094 adjustments++; 1095 1096 adjustment = R_SHIFT(clock_adjust, PHASE_WEIGHT); 1097 1098 clock_adjust -= adjustment; 1099 1100 adjustment += R_SHIFT(accum_drift, USECSCALE+ADJINTERVAL); 1101 1102 adj_time(adjustment); 1103 } 1104 1105 /*----------------------------------------------------------------------- 1106 * control synchronisation status (warnings) and do periodic adjusts 1107 * (frequency control simulation) 1108 */ 1109 static void 1110 tick( 1111 int signum 1112 ) 1113 { 1114 static unsigned long last_notice = 0; 1115 1116 #if !defined(HAVE_SIGACTION) && !defined(HAVE_SIGVEC) 1117 (void)signal(SIGALRM, tick); 1118 #endif 1119 1120 periodic_adjust(); 1121 1122 ticks += 1<<ADJINTERVAL; 1123 1124 if ((ticks - last_sync) > MAX_UNSYNC) 1125 { 1126 /* 1127 * not getting time for a while 1128 */ 1129 if (sync_state == SYNC) 1130 { 1131 /* 1132 * completely lost information 1133 */ 1134 sync_state = NO_SYNC; 1135 syslog(LOG_INFO, "DCF77 reception lost (timeout)"); 1136 last_notice = ticks; 1137 } 1138 else 1139 /* 1140 * in NO_SYNC state - look whether its time to speak up again 1141 */ 1142 if ((ticks - last_notice) > NOTICE_INTERVAL) 1143 { 1144 syslog(LOG_NOTICE, "still not synchronized to DCF77 - check receiver/signal"); 1145 last_notice = ticks; 1146 } 1147 } 1148 1149 #ifndef ITIMER_REAL 1150 (void) alarm(1<<ADJINTERVAL); 1151 #endif 1152 } 1153 1154 /*----------------------------------------------------------------------- 1155 * break association from terminal to avoid catching terminal 1156 * or process group related signals (-> daemon operation) 1157 */ 1158 static void 1159 detach( 1160 void 1161 ) 1162 { 1163 # ifdef HAVE_DAEMON 1164 daemon(0, 0); 1165 # else /* not HAVE_DAEMON */ 1166 if (fork()) 1167 exit(0); 1168 1169 { 1170 u_long s; 1171 int max_fd; 1172 1173 #if defined(HAVE_SYSCONF) && defined(_SC_OPEN_MAX) 1174 max_fd = sysconf(_SC_OPEN_MAX); 1175 #else /* HAVE_SYSCONF && _SC_OPEN_MAX */ 1176 max_fd = getdtablesize(); 1177 #endif /* HAVE_SYSCONF && _SC_OPEN_MAX */ 1178 for (s = 0; s < max_fd; s++) 1179 (void) close((int)s); 1180 (void) open("/", 0); 1181 (void) dup2(0, 1); 1182 (void) dup2(0, 2); 1183 #ifdef SYS_DOMAINOS 1184 { 1185 uid_$t puid; 1186 status_$t st; 1187 1188 proc2_$who_am_i(&puid); 1189 proc2_$make_server(&puid, &st); 1190 } 1191 #endif /* SYS_DOMAINOS */ 1192 #if defined(HAVE_SETPGID) || defined(HAVE_SETSID) 1193 # ifdef HAVE_SETSID 1194 if (setsid() == (pid_t)-1) 1195 syslog(LOG_ERR, "dcfd: setsid(): %m"); 1196 # else 1197 if (setpgid(0, 0) == -1) 1198 syslog(LOG_ERR, "dcfd: setpgid(): %m"); 1199 # endif 1200 #else /* HAVE_SETPGID || HAVE_SETSID */ 1201 { 1202 int fid; 1203 1204 fid = open("/dev/tty", 2); 1205 if (fid >= 0) 1206 { 1207 (void) ioctl(fid, (u_long) TIOCNOTTY, (char *) 0); 1208 (void) close(fid); 1209 } 1210 # ifdef HAVE_SETPGRP_0 1211 (void) setpgrp(); 1212 # else /* HAVE_SETPGRP_0 */ 1213 (void) setpgrp(0, getpid()); 1214 # endif /* HAVE_SETPGRP_0 */ 1215 } 1216 #endif /* HAVE_SETPGID || HAVE_SETSID */ 1217 } 1218 #endif /* not HAVE_DAEMON */ 1219 } 1220 1221 /*----------------------------------------------------------------------- 1222 * list possible arguments and options 1223 */ 1224 static void 1225 usage( 1226 char *program 1227 ) 1228 { 1229 fprintf(stderr, "usage: %s [-n] [-f] [-l] [-t] [-i] [-o] [-d <drift_file>] [-D <input delay>] <device>\n", program); 1230 fprintf(stderr, "\t-n do not change time\n"); 1231 fprintf(stderr, "\t-i interactive\n"); 1232 fprintf(stderr, "\t-t trace (print all datagrams)\n"); 1233 fprintf(stderr, "\t-f print all databits (includes PTB private data)\n"); 1234 fprintf(stderr, "\t-l print loop filter debug information\n"); 1235 fprintf(stderr, "\t-o print offet average for current minute\n"); 1236 fprintf(stderr, "\t-Y make internal Y2K checks then exit\n"); /* Y2KFixes */ 1237 fprintf(stderr, "\t-d <drift_file> specify alternate drift file\n"); 1238 fprintf(stderr, "\t-D <input delay>specify delay from input edge to processing in micro seconds\n"); 1239 } 1240 1241 /*----------------------------------------------------------------------- 1242 * check_y2k() - internal check of Y2K logic 1243 * (a lot of this logic lifted from ../ntpd/check_y2k.c) 1244 */ 1245 static int 1246 check_y2k( void ) 1247 { 1248 int year; /* current working year */ 1249 int year0 = 1900; /* sarting year for NTP time */ 1250 int yearend; /* ending year we test for NTP time. 1251 * 32-bit systems: through 2036, the 1252 **year in which NTP time overflows. 1253 * 64-bit systems: a reasonable upper 1254 **limit (well, maybe somewhat beyond 1255 **reasonable, but well before the 1256 **max time, by which time the earth 1257 **will be dead.) */ 1258 time_t Time; 1259 struct tm LocalTime; 1260 1261 int Fatals, Warnings; 1262 #define Error(year) if ( (year)>=2036 && LocalTime.tm_year < 110 ) \ 1263 Warnings++; else Fatals++ 1264 1265 Fatals = Warnings = 0; 1266 1267 Time = time( (time_t *)NULL ); 1268 LocalTime = *localtime( &Time ); 1269 1270 year = ( sizeof( u_long ) > 4 ) /* save max span using year as temp */ 1271 ? ( 400 * 3 ) /* three greater gregorian cycles */ 1272 : ((int)(0x7FFFFFFF / 365.242 / 24/60/60)* 2 ); /*32-bit limit*/ 1273 /* NOTE: will automacially expand test years on 1274 * 64 bit machines.... this may cause some of the 1275 * existing ntp logic to fail for years beyond 1276 * 2036 (the current 32-bit limit). If all checks 1277 * fail ONLY beyond year 2036 you may ignore such 1278 * errors, at least for a decade or so. */ 1279 yearend = year0 + year; 1280 1281 year = 1900+YEAR_PIVOT; 1282 printf( " starting year %04d\n", (int) year ); 1283 printf( " ending year %04d\n", (int) yearend ); 1284 1285 for ( ; year < yearend; year++ ) 1286 { 1287 clocktime_t ct; 1288 time_t Observed; 1289 time_t Expected; 1290 unsigned Flag; 1291 unsigned long t; 1292 1293 ct.day = 1; 1294 ct.month = 1; 1295 ct.year = year; 1296 ct.hour = ct.minute = ct.second = ct.usecond = 0; 1297 ct.utcoffset = 0; 1298 ct.flags = 0; 1299 1300 Flag = 0; 1301 Observed = dcf_to_unixtime( &ct, &Flag ); 1302 /* seems to be a clone of parse_to_unixtime() with 1303 * *a minor difference to arg2 type */ 1304 if ( ct.year != year ) 1305 { 1306 fprintf( stdout, 1307 "%04d: dcf_to_unixtime(,%d) CORRUPTED ct.year: was %d\n", 1308 (int)year, (int)Flag, (int)ct.year ); 1309 Error(year); 1310 break; 1311 } 1312 t = julian0(year) - julian0(1970); /* Julian day from 1970 */ 1313 Expected = t * 24 * 60 * 60; 1314 if ( Observed != Expected || Flag ) 1315 { /* time difference */ 1316 fprintf( stdout, 1317 "%04d: dcf_to_unixtime(,%d) FAILURE: was=%lu s/b=%lu (%ld)\n", 1318 year, (int)Flag, 1319 (unsigned long)Observed, (unsigned long)Expected, 1320 ((long)Observed - (long)Expected) ); 1321 Error(year); 1322 break; 1323 } 1324 1325 if ( year >= YEAR_PIVOT+1900 ) 1326 { 1327 /* check year % 100 code we put into dcf_to_unixtime() */ 1328 ct.year = year % 100; 1329 Flag = 0; 1330 1331 Observed = dcf_to_unixtime( &ct, &Flag ); 1332 1333 if ( Observed != Expected || Flag ) 1334 { /* time difference */ 1335 fprintf( stdout, 1336 "%04d: dcf_to_unixtime(%d,%d) FAILURE: was=%lu s/b=%lu (%ld)\n", 1337 year, (int)ct.year, (int)Flag, 1338 (unsigned long)Observed, (unsigned long)Expected, 1339 ((long)Observed - (long)Expected) ); 1340 Error(year); 1341 break; 1342 } 1343 1344 /* check year - 1900 code we put into dcf_to_unixtime() */ 1345 ct.year = year - 1900; 1346 Flag = 0; 1347 1348 Observed = dcf_to_unixtime( &ct, &Flag ); 1349 1350 if ( Observed != Expected || Flag ) { /* time difference */ 1351 fprintf( stdout, 1352 "%04d: dcf_to_unixtime(%d,%d) FAILURE: was=%lu s/b=%lu (%ld)\n", 1353 year, (int)ct.year, (int)Flag, 1354 (unsigned long)Observed, (unsigned long)Expected, 1355 ((long)Observed - (long)Expected) ); 1356 Error(year); 1357 break; 1358 } 1359 1360 1361 } 1362 } 1363 1364 return ( Fatals ); 1365 } 1366 1367 /*-------------------------------------------------- 1368 * rawdcf_init - set up modem lines for RAWDCF receivers 1369 */ 1370 #if defined(TIOCMSET) && (defined(TIOCM_DTR) || defined(CIOCM_DTR)) 1371 static void 1372 rawdcf_init( 1373 int fd 1374 ) 1375 { 1376 /* 1377 * You can use the RS232 to supply the power for a DCF77 receiver. 1378 * Here a voltage between the DTR and the RTS line is used. Unfortunately 1379 * the name has changed from CIOCM_DTR to TIOCM_DTR recently. 1380 */ 1381 1382 #ifdef TIOCM_DTR 1383 int sl232 = TIOCM_DTR; /* turn on DTR for power supply */ 1384 #else 1385 int sl232 = CIOCM_DTR; /* turn on DTR for power supply */ 1386 #endif 1387 1388 if (ioctl(fd, TIOCMSET, (caddr_t)&sl232) == -1) 1389 { 1390 syslog(LOG_NOTICE, "rawdcf_init: WARNING: ioctl(fd, TIOCMSET, [C|T]IOCM_DTR): %m"); 1391 } 1392 } 1393 #else 1394 static void 1395 rawdcf_init( 1396 int fd 1397 ) 1398 { 1399 syslog(LOG_NOTICE, "rawdcf_init: WARNING: OS interface incapable of setting DTR to power DCF modules"); 1400 } 1401 #endif /* DTR initialisation type */ 1402 1403 /*----------------------------------------------------------------------- 1404 * main loop - argument interpreter / setup / main loop 1405 */ 1406 int 1407 main( 1408 int argc, 1409 char **argv 1410 ) 1411 { 1412 unsigned char c; 1413 char **a = argv; 1414 int ac = argc; 1415 char *file = NULL; 1416 const char *drift_file = "/etc/dcfd.drift"; 1417 int fd; 1418 int offset = 15; 1419 int offsets = 0; 1420 int delay = DEFAULT_DELAY; /* average delay from input edge to time stamping */ 1421 int trace = 0; 1422 int errs = 0; 1423 1424 /* 1425 * process arguments 1426 */ 1427 while (--ac) 1428 { 1429 char *arg = *++a; 1430 if (*arg == '-') 1431 while ((c = *++arg)) 1432 switch (c) 1433 { 1434 case 't': 1435 trace = 1; 1436 interactive = 1; 1437 break; 1438 1439 case 'f': 1440 offset = 0; 1441 interactive = 1; 1442 break; 1443 1444 case 'l': 1445 loop_filter_debug = 1; 1446 offsets = 1; 1447 interactive = 1; 1448 break; 1449 1450 case 'n': 1451 no_set = 1; 1452 break; 1453 1454 case 'o': 1455 offsets = 1; 1456 interactive = 1; 1457 break; 1458 1459 case 'i': 1460 interactive = 1; 1461 break; 1462 1463 case 'D': 1464 if (ac > 1) 1465 { 1466 delay = atoi(*++a); 1467 ac--; 1468 } 1469 else 1470 { 1471 fprintf(stderr, "%s: -D requires integer argument\n", argv[0]); 1472 errs=1; 1473 } 1474 break; 1475 1476 case 'd': 1477 if (ac > 1) 1478 { 1479 drift_file = *++a; 1480 ac--; 1481 } 1482 else 1483 { 1484 fprintf(stderr, "%s: -d requires file name argument\n", argv[0]); 1485 errs=1; 1486 } 1487 break; 1488 1489 case 'Y': 1490 errs=check_y2k(); 1491 exit( errs ? 1 : 0 ); 1492 1493 default: 1494 fprintf(stderr, "%s: unknown option -%c\n", argv[0], c); 1495 errs=1; 1496 break; 1497 } 1498 else 1499 if (file == NULL) 1500 file = arg; 1501 else 1502 { 1503 fprintf(stderr, "%s: device specified twice\n", argv[0]); 1504 errs=1; 1505 } 1506 } 1507 1508 if (errs) 1509 { 1510 usage(argv[0]); 1511 exit(1); 1512 } 1513 else 1514 if (file == NULL) 1515 { 1516 fprintf(stderr, "%s: device not specified\n", argv[0]); 1517 usage(argv[0]); 1518 exit(1); 1519 } 1520 1521 errs = LINES+1; 1522 1523 /* 1524 * get access to DCF77 tty port 1525 */ 1526 fd = open(file, O_RDONLY); 1527 if (fd == -1) 1528 { 1529 perror(file); 1530 exit(1); 1531 } 1532 else 1533 { 1534 int i, rrc; 1535 struct timeval t, tt, tlast; 1536 struct timeval timeout; 1537 struct timeval phase; 1538 struct timeval time_offset; 1539 char pbuf[61]; /* printable version */ 1540 char buf[61]; /* raw data */ 1541 clocktime_t clock_time; /* wall clock time */ 1542 time_t utc_time = 0; 1543 time_t last_utc_time = 0; 1544 long usecerror = 0; 1545 long lasterror = 0; 1546 #if defined(HAVE_TERMIOS_H) || defined(STREAM) 1547 struct termios term; 1548 #else /* not HAVE_TERMIOS_H || STREAM */ 1549 # if defined(HAVE_TERMIO_H) || defined(HAVE_SYSV_TTYS) 1550 struct termio term; 1551 # endif/* HAVE_TERMIO_H || HAVE_SYSV_TTYS */ 1552 #endif /* not HAVE_TERMIOS_H || STREAM */ 1553 unsigned int rtc = CVT_NONE; 1554 1555 rawdcf_init(fd); 1556 1557 timeout.tv_sec = 1; 1558 timeout.tv_usec = 500000; 1559 1560 phase.tv_sec = 0; 1561 phase.tv_usec = delay; 1562 1563 /* 1564 * setup TTY (50 Baud, Read, 8Bit, No Hangup, 1 character IO) 1565 */ 1566 if (TTY_GETATTR(fd, &term) == -1) 1567 { 1568 perror("tcgetattr"); 1569 exit(1); 1570 } 1571 1572 memset(term.c_cc, 0, sizeof(term.c_cc)); 1573 term.c_cc[VMIN] = 1; 1574 #ifdef NO_PARENB_IGNPAR 1575 term.c_cflag = CS8|CREAD|CLOCAL; 1576 #else 1577 term.c_cflag = CS8|CREAD|CLOCAL|PARENB; 1578 #endif 1579 term.c_iflag = IGNPAR; 1580 term.c_oflag = 0; 1581 term.c_lflag = 0; 1582 1583 cfsetispeed(&term, B50); 1584 cfsetospeed(&term, B50); 1585 1586 if (TTY_SETATTR(fd, &term) == -1) 1587 { 1588 perror("tcsetattr"); 1589 exit(1); 1590 } 1591 1592 /* 1593 * lose terminal if in daemon operation 1594 */ 1595 if (!interactive) 1596 detach(); 1597 1598 /* 1599 * get syslog() initialized 1600 */ 1601 #ifdef LOG_DAEMON 1602 openlog("dcfd", LOG_PID, LOG_DAEMON); 1603 #else 1604 openlog("dcfd", LOG_PID); 1605 #endif 1606 1607 /* 1608 * setup periodic operations (state control / frequency control) 1609 */ 1610 #ifdef HAVE_SIGACTION 1611 { 1612 struct sigaction act; 1613 1614 # ifdef HAVE_SA_SIGACTION_IN_STRUCT_SIGACTION 1615 act.sa_sigaction = (void (*) (int, siginfo_t *, void *))0; 1616 # endif /* HAVE_SA_SIGACTION_IN_STRUCT_SIGACTION */ 1617 act.sa_handler = tick; 1618 sigemptyset(&act.sa_mask); 1619 act.sa_flags = 0; 1620 1621 if (sigaction(SIGALRM, &act, (struct sigaction *)0) == -1) 1622 { 1623 syslog(LOG_ERR, "sigaction(SIGALRM): %m"); 1624 exit(1); 1625 } 1626 } 1627 #else 1628 #ifdef HAVE_SIGVEC 1629 { 1630 struct sigvec vec; 1631 1632 vec.sv_handler = tick; 1633 vec.sv_mask = 0; 1634 vec.sv_flags = 0; 1635 1636 if (sigvec(SIGALRM, &vec, (struct sigvec *)0) == -1) 1637 { 1638 syslog(LOG_ERR, "sigvec(SIGALRM): %m"); 1639 exit(1); 1640 } 1641 } 1642 #else 1643 (void) signal(SIGALRM, tick); 1644 #endif 1645 #endif 1646 1647 #ifdef ITIMER_REAL 1648 { 1649 struct itimerval it; 1650 1651 it.it_interval.tv_sec = 1<<ADJINTERVAL; 1652 it.it_interval.tv_usec = 0; 1653 it.it_value.tv_sec = 1<<ADJINTERVAL; 1654 it.it_value.tv_usec = 0; 1655 1656 if (setitimer(ITIMER_REAL, &it, (struct itimerval *)0) == -1) 1657 { 1658 syslog(LOG_ERR, "setitimer: %m"); 1659 exit(1); 1660 } 1661 } 1662 #else 1663 (void) alarm(1<<ADJINTERVAL); 1664 #endif 1665 1666 PRINTF(" DCF77 monitor %s - Copyright (C) 1993-2005 by Frank Kardel\n\n", revision); 1667 1668 pbuf[60] = '\0'; 1669 for ( i = 0; i < 60; i++) 1670 pbuf[i] = '.'; 1671 1672 read_drift(drift_file); 1673 1674 /* 1675 * what time is it now (for interval measurement) 1676 */ 1677 gettimeofday(&tlast, 0L); 1678 i = 0; 1679 /* 1680 * loop until input trouble ... 1681 */ 1682 do 1683 { 1684 /* 1685 * get an impulse 1686 */ 1687 while ((rrc = read(fd, &c, 1)) == 1) 1688 { 1689 gettimeofday(&t, 0L); 1690 tt = t; 1691 timersub(&t, &tlast); 1692 1693 if (errs > LINES) 1694 { 1695 PRINTF(" %s", &"PTB private....RADMLSMin....PHour..PMDay..DayMonthYear....P\n"[offset]); 1696 PRINTF(" %s", &"---------------RADMLS1248124P124812P1248121241248112481248P\n"[offset]); 1697 errs = 0; 1698 } 1699 1700 /* 1701 * timeout -> possible minute mark -> interpretation 1702 */ 1703 if (timercmp(&t, &timeout, >)) 1704 { 1705 PRINTF("%c %.*s ", pat[i % (sizeof(pat)-1)], 59 - offset, &pbuf[offset]); 1706 1707 if ((rtc = cvt_rawdcf((unsigned char *)buf, i, &clock_time)) != CVT_OK) 1708 { 1709 /* 1710 * this data was bad - well - forget synchronisation for now 1711 */ 1712 PRINTF("\n"); 1713 if (sync_state == SYNC) 1714 { 1715 sync_state = NO_SYNC; 1716 syslog(LOG_INFO, "DCF77 reception lost (bad data)"); 1717 } 1718 errs++; 1719 } 1720 else 1721 if (trace) 1722 { 1723 PRINTF("\r %.*s ", 59 - offset, &buf[offset]); 1724 } 1725 1726 1727 buf[0] = c; 1728 1729 /* 1730 * collect first character 1731 */ 1732 if (((c^0xFF)+1) & (c^0xFF)) 1733 pbuf[0] = '?'; 1734 else 1735 pbuf[0] = type(c) ? '#' : '-'; 1736 1737 for ( i = 1; i < 60; i++) 1738 pbuf[i] = '.'; 1739 1740 i = 0; 1741 } 1742 else 1743 { 1744 /* 1745 * collect character 1746 */ 1747 buf[i] = c; 1748 1749 /* 1750 * initial guess (usually correct) 1751 */ 1752 if (((c^0xFF)+1) & (c^0xFF)) 1753 pbuf[i] = '?'; 1754 else 1755 pbuf[i] = type(c) ? '#' : '-'; 1756 1757 PRINTF("%c %.*s ", pat[i % (sizeof(pat)-1)], 59 - offset, &pbuf[offset]); 1758 } 1759 1760 if (i == 0 && rtc == CVT_OK) 1761 { 1762 /* 1763 * we got a good time code here - try to convert it to 1764 * UTC 1765 */ 1766 if ((utc_time = dcf_to_unixtime(&clock_time, &rtc)) == -1) 1767 { 1768 PRINTF("*** BAD CONVERSION\n"); 1769 } 1770 1771 if (utc_time != (last_utc_time + 60)) 1772 { 1773 /* 1774 * well, two successive sucessful telegrams are not 60 seconds 1775 * apart 1776 */ 1777 PRINTF("*** NO MINUTE INC\n"); 1778 if (sync_state == SYNC) 1779 { 1780 sync_state = NO_SYNC; 1781 syslog(LOG_INFO, "DCF77 reception lost (data mismatch)"); 1782 } 1783 errs++; 1784 rtc = CVT_FAIL|CVT_BADTIME|CVT_BADDATE; 1785 } 1786 else 1787 usecerror = 0; 1788 1789 last_utc_time = utc_time; 1790 } 1791 1792 if (rtc == CVT_OK) 1793 { 1794 if (i == 0) 1795 { 1796 /* 1797 * valid time code - determine offset and 1798 * note regained reception 1799 */ 1800 last_sync = ticks; 1801 if (sync_state == NO_SYNC) 1802 { 1803 syslog(LOG_INFO, "receiving DCF77"); 1804 } 1805 else 1806 { 1807 /* 1808 * we had at least one minute SYNC - thus 1809 * last error is valid 1810 */ 1811 time_offset.tv_sec = lasterror / 1000000; 1812 time_offset.tv_usec = lasterror % 1000000; 1813 adjust_clock(&time_offset, drift_file, utc_time); 1814 } 1815 sync_state = SYNC; 1816 } 1817 1818 time_offset.tv_sec = utc_time + i; 1819 time_offset.tv_usec = 0; 1820 1821 timeradd(&time_offset, &phase); 1822 1823 usecerror += (time_offset.tv_sec - tt.tv_sec) * 1000000 + time_offset.tv_usec 1824 -tt.tv_usec; 1825 1826 /* 1827 * output interpreted DCF77 data 1828 */ 1829 PRINTF(offsets ? "%s, %2ld:%02ld:%02d, %ld.%02ld.%02ld, <%s%s%s%s> (%c%ld.%06lds)" : 1830 "%s, %2ld:%02ld:%02d, %ld.%02ld.%02ld, <%s%s%s%s>", 1831 wday[clock_time.wday], 1832 clock_time.hour, clock_time.minute, i, clock_time.day, clock_time.month, 1833 clock_time.year, 1834 (clock_time.flags & DCFB_ALTERNATE) ? "R" : "_", 1835 (clock_time.flags & DCFB_ANNOUNCE) ? "A" : "_", 1836 (clock_time.flags & DCFB_DST) ? "D" : "_", 1837 (clock_time.flags & DCFB_LEAP) ? "L" : "_", 1838 (lasterror < 0) ? '-' : '+', l_abs(lasterror) / 1000000, l_abs(lasterror) % 1000000 1839 ); 1840 1841 if (trace && (i == 0)) 1842 { 1843 PRINTF("\n"); 1844 errs++; 1845 } 1846 lasterror = usecerror / (i+1); 1847 } 1848 else 1849 { 1850 lasterror = 0; /* we cannot calculate phase errors on bad reception */ 1851 } 1852 1853 PRINTF("\r"); 1854 1855 if (i < 60) 1856 { 1857 i++; 1858 } 1859 1860 tlast = tt; 1861 1862 if (interactive) 1863 fflush(stdout); 1864 } 1865 } while ((rrc == -1) && (errno == EINTR)); 1866 1867 /* 1868 * lost IO - sorry guys 1869 */ 1870 syslog(LOG_ERR, "TERMINATING - cannot read from device %s (%m)", file); 1871 1872 (void)close(fd); 1873 } 1874 1875 closelog(); 1876 1877 return 0; 1878 } 1879 1880 /* 1881 * History: 1882 * 1883 * dcfd.c,v 1884 * Revision 4.18 2005/10/07 22:08:18 kardel 1885 * make dcfd.c compile on NetBSD 3.99.9 again (configure/sigvec compatibility fix) 1886 * 1887 * Revision 4.17.2.1 2005/10/03 19:15:16 kardel 1888 * work around configure not detecting a missing sigvec compatibility 1889 * interface on NetBSD 3.99.9 and above 1890 * 1891 * Revision 4.17 2005/08/10 10:09:44 kardel 1892 * output revision information 1893 * 1894 * Revision 4.16 2005/08/10 06:33:25 kardel 1895 * cleanup warnings 1896 * 1897 * Revision 4.15 2005/08/10 06:28:45 kardel 1898 * fix setting of baud rate 1899 * 1900 * Revision 4.14 2005/04/16 17:32:10 kardel 1901 * update copyright 1902 * 1903 * Revision 4.13 2004/11/14 15:29:41 kardel 1904 * support PPSAPI, upgrade Copyright to Berkeley style 1905 * 1906 */ 1907