wiretap/ascend.y

   1 %{
   2 /* ascend.y
   3  *
   4  * $Id$
   5  *
   6  * Wiretap Library
   7  * Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version 2
  12  * of the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  22  *
  23  */
  24
  25 /*
  26     Example 'pridisp' output data - one paragraph/frame:
  27
  28 PRI-XMIT-27: (task "l1Task" at 0x10216fe0, time: 560194.01) 4 octets @ 0x1027c5b0
  29   [0000]: 00 01 01 a9                                         ....
  30 PRI-RCV-27: (task "idle task" at 0x10123570, time: 560194.01) 4 octets @ 0x1027fb00
  31   [0000]: 00 01 01 dd
  32
  33     Example 'pridisp' output data - two paragraphs/frame for XMIT case only:
  34
  35 PRI-XMIT-19/1:  (task "l1Task" at 0x10216840, time: 274759.98) 4 octets @ 0x1027f230
  36   [0000]: 00 01 30 d8                                         ..0.
  37 PRI-XMIT-19/2 (task "l1Task" at 0x10216840, time: 274759.98) 11 octets @ 0x1027f234
  38   [0000]: 08 02 8c bf 02 18 04 e9  82 83 8f                   ........ ...
  39
  40     Example 'ether-disp' output data:
  41
  42 ETHER3ND RECV: (task "_sarTask" at 0x802c6eb0, time: 259848.03) 775 octets @ 0xa8fb2020
  43   [0000]: 00 d0 52 04 e7 1e 08 00  20 ae 51 b5 08 00 45 00    ..R..... .Q...E.
  44   [0010]: 02 f9 05 e6 40 00 3f 11  6e 39 87 fe c4 95 3c 3c    ....@.?.  n9....<<
  45   [0020]: 3c 05 13 c4 13 c4 02 e5  ef ed 49 4e 56 49 54 45    <.......  ..INVITE
  46   [0030]: 20 73 69 70 3a 35 32 30  37 33 40 36 30 2e 36 30     sip:520 73@60.60
  47   [0040]: 2e 36 30 2e 35 20 53 49  50 2f 32 2e 30 0d 0a 56    .60.5 SI P/2.0..V
  48   [0050]: 69 61 3a 20 53 49 50 2f  32 2e 30 2f 55 44 50 20    ia: SIP/ 2.0/UDP
  49   [0060]: 31 33 35 2e                                         135.
  50
  51     Example 'wandsess' output data:
  52
  53 RECV-iguana:241:(task: B02614C0, time: 1975432.85) 49 octets @ 8003BD94
  54   [0000]: FF 03 00 3D C0 06 CA 22 2F 45 00 00 28 6A 3B 40
  55   [0010]: 00 3F 03 D7 37 CE 41 62 12 CF 00 FB 08 20 27 00
  56   [0020]: 50 E4 08 DD D7 7C 4C 71 92 50 10 7D 78 67 C8 00
  57   [0030]: 00
  58 XMIT-iguana:241:(task: B04E12C0, time: 1975432.85) 53 octets @ 8009EB16
  59   [0000]: FF 03 00 3D C0 09 1E 31 21 45 00 00 2C 2D BD 40
  60   [0010]: 00 7A 06 D8 B1 CF 00 FB 08 CE 41 62 12 00 50 20
  61   [0020]: 29 7C 4C 71 9C 9A 6A 93 A4 60 12 22 38 3F 10 00
  62   [0030]: 00 02 04 05 B4
  63
  64     Example 'wdd' output data:
  65
  66 Date: 01/12/1990.  Time: 12:22:33
  67 Cause an attempt to place call to 14082750382
  68 WD_DIALOUT_DISP: chunk 2515EE type IP.
  69 (task: 251790, time: 994953.28) 44 octets @ 2782B8
  70   [0000]: 00 C0 7B 71 45 6C 00 60 08 16 AA 51 08 00 45 00
  71   [0010]: 00 2C 66 1C 40 00 80 06 53 F6 AC 14 00 18 CC 47
  72   [0020]: C8 45 0A 31 00 50 3B D9 5B 75 00 00
  73
  74     The following output comes from a MAX with Software 7.2.3:
  75
  76 RECV-187:(task: B050B480, time: 18042248.03) 100 octets @ 800012C0
  77   [0000]: FF 03 00 21 45 00 00 60 E3 49 00 00 7F 11 FD 7B
  78   [0010]: C0 A8 F7 05 8A C8 18 51 00 89 00 89 00 4C C7 C1
  79   [0020]: CC 8E 40 00 00 01 00 00 00 00 00 01 20 45 4A 45
  80   [0030]: 42 45 43 45 48 43 4E 46 43 46 41 43 41 43 41 43
  81   [0040]: 41 43 41 43 41 43 41 43 41 43 41 42 4E 00 00 20
  82   [0050]: 00 01 C0 0C 00 20 00 01 00 04 93 E0 00 06 60 00
  83   [0060]: C0 A8 F7 05
  84 XMIT-187:(task: B0292CA0, time: 18042248.04) 60 octets @ 800AD576
  85   [0000]: FF 03 00 21 45 00 00 38 D7 EE 00 00 0F 01 11 2B
  86   [0010]: 0A FF FF FE C0 A8 F7 05 03 0D 33 D3 00 00 00 00
  87   [0020]: 45 00 00 60 E3 49 00 00 7E 11 FE 7B C0 A8 F7 05
  88   [0030]: 8A C8 18 51 00 89 00 89 00 4C C7 C1
  89 RECV-187:(task: B0292CA0, time: 18042251.92) 16 octets @ 800018E8
  90   [0000]: FF 03 C0 21 09 01 00 0C DE 61 96 4B 00 30 94 92
  91
  92   In TAOS 8.0, Lucent slightly changed the format as follows:
  93
  94     Example 'wandisp' output data (TAOS 8.0.3): (same format is used
  95     for 'wanopen' and 'wannext' command)
  96
  97 RECV-14: (task "idle task" at 0xb05e6e00, time: 1279.01) 29 octets @ 0x8000e0fc
  98   [0000]: ff 03 c0 21 01 01 00 19  01 04 05 f4 11 04 05 f4    ...!.... ........
  99   [0010]: 13 09 03 00 c0 7b 9a 9f  2d 17 04 10 00             .....{.. -....
 100 XMIT-14: (task "idle task" at 0xb05e6e00, time: 1279.02) 38 octets @ 0x8007fd56
 101   [0000]: ff 03 c0 21 01 01 00 22  00 04 00 00 01 04 05 f4    ...!..." ........
 102   [0010]: 03 05 c2 23 05 11 04 05  f4 13 09 03 00 c0 7b 80    ...#.... ......{.
 103   [0020]: 7c ef 17 04 0e 00                                   |.....
 104 XMIT-14: (task "idle task" at 0xb05e6e00, time: 1279.02) 29 octets @ 0x8007fa36
 105   [0000]: ff 03 c0 21 02 01 00 19  01 04 05 f4 11 04 05 f4    ...!.... ........
 106   [0010]: 13 09 03 00 c0 7b 9a 9f  2d 17 04 10 00             .....{.. -....
 107
 108     Example 'wandsess' output data (TAOS 8.0.3):
 109
 110 RECV-Max7:20: (task "_brouterControlTask" at 0xb094ac20, time: 1481.50) 20 octets @ 0x8000d198
 111   [0000]: ff 03 00 3d c0 00 00 04  80 fd 02 01 00 0a 11 06    ...=.... ........
 112   [0010]: 00 01 01 03                                         ....
 113 XMIT-Max7:20: (task "_brouterControlTask" at 0xb094ac20, time: 1481.51) 26 octets @ 0x800806b6
 114   [0000]: ff 03 00 3d c0 00 00 00  80 21 01 01 00 10 02 06    ...=.... .!......
 115   [0010]: 00 2d 0f 01 03 06 89 64  03 08                      .-.....d ..
 116 XMIT-Max7:20: (task "_brouterControlTask" at 0xb094ac20, time: 1481.51) 20 octets @ 0x8007f716
 117   [0000]: ff 03 00 3d c0 00 00 01  80 fd 01 01 00 0a 11 06    ...=.... ........
 118   [0010]: 00 01 01 03                                         ....
 119
 120   The changes since TAOS 7.X are:
 121
 122     1) White space is added before "(task".
 123     2) Task has a name, indicated by a subsequent string surrounded by a
 124        double-quote.
 125     3) Address expressed in hex number has a preceeding "0x".
 126     4) Hex numbers are in lower case.
 127     5) There is a character display corresponding to hex data in each line.
 128
 129  */
 130
 131 #include "config.h"
 132
 133 #include <stdio.h>
 134 #include <stdlib.h>
 135 #include <string.h>
 136
 137 #include "wtap-int.h"
 138 #include "buffer.h"
 139 #include "ascendtext.h"
 140 #include "ascend-int.h"
 141 #include "file_wrappers.h"
 142
 143 #define NO_USER "<none>"
 144
 145 int yyparse(FILE_T fh);
 146 void yyerror(FILE_T fh _U_, const char *);
 147
 148 const gchar *ascend_parse_error;
 149
 150 static unsigned int bcur;
 151 static guint32 start_time, secs, usecs, caplen, wirelen;
 152 struct ascend_phdr *pseudo_header;
 153 static guint8 *pkt_data;
 154 static gint64 first_hexbyte;
 155
 156 %}
 157
 158 %union {
 159 gchar  *s;
 160 guint32 d;
 161 guint8  b;
 162 }
 163
 164 %token <s> STRING KEYWORD WDD_DATE WDD_CHUNK COUNTER SLASH_SUFFIX
 165 %token <d> WDS_PREFIX ISDN_PREFIX ETHER_PREFIX DECNUM HEXNUM
 166 %token <b> HEXBYTE
 167
 168 %type <s> string dataln datagroup
 169 %type <d> wds_prefix isdn_prefix ether_prefix decnum hexnum
 170 %type <b> byte bytegroup
 171
 172 %parse-param { FILE_T fh }
 173
 174 %%
 175
 176 data_packet:
 177   | ether_hdr datagroup
 178   | deferred_isdn_hdr datagroup deferred_isdn_hdr datagroup
 179   | isdn_hdr datagroup
 180   | wds_hdr datagroup
 181   | wds8_hdr datagroup
 182   | wdp7_hdr datagroup
 183   | wdp8_hdr datagroup
 184   | wdd_date wdd_hdr datagroup
 185   | wdd_hdr datagroup
 186 ;
 187
 188 isdn_prefix: ISDN_PREFIX;
 189
 190 ether_prefix: ETHER_PREFIX;
 191
 192 wds_prefix: WDS_PREFIX;
 193
 194 string: STRING;
 195
 196 decnum: DECNUM;
 197
 198 hexnum: HEXNUM;
 199
 200 /*
 201   pridisp special case - I-frame header printed separately from contents,
 202   one frame across two messages.
 203
 204 PRI-XMIT-0/1:  (task "l1Task" at 0x80152b20, time: 283529.65) 4 octets @
 205 0x80128220
 206   [0000]: 00 01 ae b2                                         ....
 207 PRI-XMIT-0/2 (task "l1Task" at 0x80152b20, time: 283529.65) 10 octets @
 208 0x80128224
 209   [0000]: 08 02 d7 e3 02 18 03 a9  83 8a                      ........
 210
 211 */
 212 deferred_isdn_hdr: isdn_prefix decnum SLASH_SUFFIX KEYWORD string KEYWORD hexnum KEYWORD decnum decnum decnum KEYWORD HEXNUM {
 213   wirelen += $11;
 214   caplen += $11;
 215   secs = $9;
 216   usecs = $10;
 217   if (pseudo_header != NULL) {
 218     pseudo_header->type = $1;
 219     pseudo_header->sess = $2;
 220     pseudo_header->call_num[0] = '\0';
 221     pseudo_header->chunk = 0;
 222     pseudo_header->task = $7;
 223   }
 224   /* because we have two data groups */
 225   first_hexbyte = 0;
 226 }
 227 ;
 228
 229 /*
 230 PRI-XMIT-19:  (task "l1Task" at 0x10216840, time: 274758.67) 4 octets @ 0x1027c1c0
 231  ... or ...
 232 PRI-RCV-27:  (task "idle task" at 0x10123570, time: 560194.01) 4 octets @ 0x1027fb00
 233 */
 234 isdn_hdr: isdn_prefix decnum KEYWORD string KEYWORD hexnum KEYWORD decnum decnum decnum KEYWORD HEXNUM {
 235   wirelen = $10;
 236   caplen = $10;
 237   secs = $8;
 238   usecs = $9;
 239   if (pseudo_header != NULL) {
 240     pseudo_header->type = $1;
 241     pseudo_header->sess = $2;
 242     pseudo_header->call_num[0] = '\0';
 243     pseudo_header->chunk = 0;
 244     pseudo_header->task = $6;
 245   }
 246   first_hexbyte = 0;
 247 }
 248 ;
 249
 250 /*
 251 ETHER3ND XMIT: (task "_sarTask" at 0x802c6eb0, time: 259848.11) 414 octets @ 0xa
 252 885f80e
 253 */
 254 ether_hdr: ether_prefix string KEYWORD string KEYWORD hexnum KEYWORD decnum decnum
 255  decnum KEYWORD HEXNUM {
 256   wirelen = $10;
 257   caplen = $10;
 258   secs = $8;
 259   usecs = $9;
 260   if (pseudo_header != NULL) {
 261     pseudo_header->type = $1;
 262     pseudo_header->call_num[0] = '\0';
 263     pseudo_header->chunk = 0;
 264     pseudo_header->task = $6;
 265   }
 266 }
 267 ;
 268
 269 /* RECV-iguana:241:(task: B02614C0, time: 1975432.85) 49 octets @ 8003BD94 */
 270 /*            1        2      3      4       5      6       7      8      9      10     11 */
 271 wds_hdr: wds_prefix string decnum KEYWORD hexnum KEYWORD decnum decnum decnum KEYWORD HEXNUM {
 272   wirelen = $9;
 273   caplen = $9;
 274   secs = $7;
 275   usecs = $8;
 276   if (pseudo_header != NULL) {
 277     /* pseudo_header->user is set in ascend_scanner.l */
 278     pseudo_header->type = $1;
 279     pseudo_header->sess = $3;
 280     pseudo_header->call_num[0] = '\0';
 281     pseudo_header->chunk = 0;
 282     pseudo_header->task = $5;
 283   }
 284 }
 285 ;
 286
 287 /* RECV-Max7:20: (task "_brouterControlTask" at 0xb094ac20, time: 1481.50) 20 octets @ 0x8000d198 */
 288 /*                1       2       3     4       5       6      7       8      9      10     11     12      13 */
 289 wds8_hdr: wds_prefix string decnum KEYWORD string KEYWORD hexnum KEYWORD decnum decnum decnum KEYWORD HEXNUM {
 290   wirelen = $11;
 291   caplen = $11;
 292   secs = $9;
 293   usecs = $10;
 294   if (pseudo_header != NULL) {
 295     /* pseudo_header->user is set in ascend_scanner.l */
 296     pseudo_header->type = $1;
 297     pseudo_header->sess = $3;
 298     pseudo_header->call_num[0] = '\0';
 299     pseudo_header->chunk = 0;
 300     pseudo_header->task = $7;
 301   }
 302 }
 303 ;
 304
 305 /* RECV-187:(task: B050B480, time: 18042248.03) 100 octets @ 800012C0 */
 306 /*            1        2       3      4       5       6      7      8      9      10    */
 307 wdp7_hdr: wds_prefix decnum KEYWORD hexnum KEYWORD decnum decnum decnum KEYWORD HEXNUM {
 308   wirelen = $8;
 309   caplen = $8;
 310   secs = $6;
 311   usecs = $7;
 312   if (pseudo_header != NULL) {
 313     /* pseudo_header->user is set in ascend_scanner.l */
 314     pseudo_header->type = $1;
 315     pseudo_header->sess = $2;
 316     pseudo_header->call_num[0] = '\0';
 317     pseudo_header->chunk = 0;
 318     pseudo_header->task = $4;
 319   }
 320 }
 321 ;
 322
 323 /* XMIT-44: (task "freedm_task" at 0xe051fd10, time: 6258.66) 29 octets @ 0x606d1f00 */
 324 /*              1        2       3      4       5      6      7       8      9      10     11      12 */
 325 wdp8_hdr: wds_prefix decnum KEYWORD string KEYWORD hexnum KEYWORD decnum decnum decnum KEYWORD HEXNUM {
 326   wirelen = $10;
 327   caplen = $10;
 328   secs = $8;
 329   usecs = $9;
 330   if (pseudo_header != NULL) {
 331     /* pseudo_header->user is set in ascend_scanner.l */
 332     pseudo_header->type = $1;
 333     pseudo_header->sess = $2;
 334     pseudo_header->call_num[0] = '\0';
 335     pseudo_header->chunk = 0;
 336     pseudo_header->task = $6;
 337   }
 338 }
 339 ;
 340
 341 /*
 342 Date: 01/12/1990.  Time: 12:22:33
 343 Cause an attempt to place call to 14082750382
 344 */
 345 /*           1        2      3      4      5       6      7      8      9      10*/
 346 wdd_date: WDD_DATE decnum decnum decnum KEYWORD decnum decnum decnum KEYWORD string {
 347   /*
 348    * Supply the date/time value to the code above us; it will use the
 349    * first date/time value supplied as the capture start date/time.
 350    */
 351   struct tm wddt;
 352
 353   wddt.tm_sec  = $8;
 354   wddt.tm_min  = $7;
 355   wddt.tm_hour = $6;
 356   wddt.tm_mday = $3;
 357   wddt.tm_mon  = $2 - 1;
 358   wddt.tm_year = ($4 > 1970) ? $4 - 1900 : 70;
 359   wddt.tm_isdst = -1;
 360
 361   start_time = (guint32) mktime(&wddt);
 362 }
 363 ;
 364
 365 /*
 366 WD_DIALOUT_DISP: chunk 2515EE type IP.
 367 (task: 251790, time: 994953.28) 44 octets @ 2782B8
 368 */
 369 /*           1        2      3       4       5      6       7      8      9      10     11*/
 370 wdd_hdr: WDD_CHUNK hexnum KEYWORD KEYWORD hexnum KEYWORD decnum decnum decnum KEYWORD HEXNUM {
 371   wirelen = $9;
 372   caplen = $9;
 373   secs = $7;
 374   usecs = $8;
 375   if (pseudo_header != NULL) {
 376     /* pseudo_header->call_num is set in ascend_scanner.l */
 377     pseudo_header->type = ASCEND_PFX_WDD;
 378     pseudo_header->user[0] = '\0';
 379     pseudo_header->sess = 0;
 380     pseudo_header->chunk = $2;
 381     pseudo_header->task = $5;
 382   }
 383 }
 384 ;
 385
 386 byte: HEXBYTE {
 387   /* remember the position of the data group in the trace, to tip
 388      off ascend_seek() as to where to look for the next header. */
 389   if (first_hexbyte == 0)
 390     first_hexbyte = file_tell(fh);
 391
 392   if (bcur < caplen) {
 393     pkt_data[bcur] = $1;
 394     bcur++;
 395   }
 396
 397   /* arbitrary safety maximum... */
 398   if (bcur >= ASCEND_MAX_PKT_LEN)
 399     YYACCEPT;
 400 }
 401 ;
 402
 403 /* XXX  There must be a better way to do this... */
 404 bytegroup: byte
 405   | byte byte
 406   | byte byte byte
 407   | byte byte byte byte
 408   | byte byte byte byte byte
 409   | byte byte byte byte byte byte
 410   | byte byte byte byte byte byte byte
 411   | byte byte byte byte byte byte byte byte
 412   | byte byte byte byte byte byte byte byte byte
 413   | byte byte byte byte byte byte byte byte byte byte
 414   | byte byte byte byte byte byte byte byte byte byte byte
 415   | byte byte byte byte byte byte byte byte byte byte byte byte
 416   | byte byte byte byte byte byte byte byte byte byte byte byte byte
 417   | byte byte byte byte byte byte byte byte byte byte byte byte byte byte
 418   | byte byte byte byte byte byte byte byte byte byte byte byte byte byte byte
 419   | byte byte byte byte byte byte byte byte byte byte byte byte byte byte byte byte
 420 ;
 421
 422 dataln: COUNTER bytegroup;
 423
 424 datagroup: dataln
 425   | dataln dataln
 426   | dataln dataln dataln
 427   | dataln dataln dataln dataln
 428   | dataln dataln dataln dataln dataln
 429   | dataln dataln dataln dataln dataln dataln
 430   | dataln dataln dataln dataln dataln dataln dataln
 431   | dataln dataln dataln dataln dataln dataln dataln dataln
 432 ;
 433
 434 %%
 435
 436 void
 437 init_parse_ascend(void)
 438 {
 439   at_eof = 0;
 440   start_time = 0;       /* we haven't see a date/time yet */
 441 }
 442
 443 /* Run the parser. */
 444 static int
 445 run_ascend_parser(FILE_T fh, struct wtap_pkthdr *phdr, guint8 *pd)
 446 {
 447   /* yydebug = 1; */
 448   int retval;
 449
 450   ascend_init_lexer(fh);
 451   pseudo_header = &phdr->pseudo_header.ascend;
 452   pkt_data = pd;
 453
 454   bcur = 0;
 455   first_hexbyte = 0;
 456   wirelen = 0;
 457   caplen = 0;
 458
 459   /*
 460    * Not all packets in a "wdd" dump necessarily have a "Cause an
 461    * attempt to place call to" header (I presume this can happen if
 462    * there was a call in progress when the packet was sent or
 463    * received), so we won't necessarily have the phone number for
 464    * the packet.
 465    *
 466    * XXX - we could assume, in the sequential pass, that it's the
 467    * phone number from the last call, and remember that for use
 468    * when doing random access.
 469    */
 470   pseudo_header->call_num[0] = '\0';
 471
 472   retval = yyparse(fh);
 473
 474   caplen = bcur;
 475
 476   return retval;
 477 }
 478
 479 /* Parse the capture file.
 480    Returns:
 481      TRUE if we got a packet
 482      FALSE otherwise. */
 483 gboolean
 484 check_ascend(FILE_T fh, struct wtap_pkthdr *phdr)
 485 {
 486   guint8 buf[ASCEND_MAX_PKT_LEN];
 487
 488   run_ascend_parser(fh, phdr, buf);
 489
 490   /* if we got at least some data, return success even if the parser
 491      reported an error. This is because the debug header gives the number
 492      of bytes on the wire, not actually how many bytes are in the trace.
 493      We won't know where the data ends until we run into the next packet. */
 494   return (caplen != 0);
 495 }
 496
 497 /* Parse the capture file.
 498    Returns:
 499      PARSED_RECORD if we got a packet
 500      PARSED_NONRECORD if the parser succeeded but didn't see a packet
 501      PARSE_FAILED if the parser failed. */
 502 parse_t
 503 parse_ascend(ascend_t *ascend, FILE_T fh, struct wtap_pkthdr *phdr, Buffer *buf,
 504              guint length)
 505 {
 506   int retval;
 507
 508   buffer_assure_space(buf, length);
 509   retval = run_ascend_parser(fh, phdr, buffer_start_ptr(buf));
 510
 511   /* did we see any data (hex bytes)? if so, tip off ascend_seek()
 512      as to where to look for the next packet, if any. If we didn't,
 513      maybe this record was broken. Advance so we don't get into
 514      an infinite loop reading a broken trace. */
 515   if (first_hexbyte) {
 516     ascend->next_packet_seek_start = first_hexbyte;
 517   } else {
 518     /* Sometimes, a header will be printed but the data will be omitted, or
 519        worse -- two headers will be printed, followed by the data for each.
 520        Because of this, we need to be fairly tolerant of what we accept
 521        here.  If we didn't find any hex bytes, skip over what we've read so
 522        far so we can try reading a new packet. */
 523     ascend->next_packet_seek_start = file_tell(fh);
 524     retval = 0;
 525   }
 526
 527   /* if we got at least some data, return success even if the parser
 528      reported an error. This is because the debug header gives the number
 529      of bytes on the wire, not actually how many bytes are in the trace.
 530      We won't know where the data ends until we run into the next packet. */
 531   if (caplen) {
 532     if (! ascend->adjusted) {
 533       ascend->adjusted = TRUE;
 534       if (start_time != 0) {
 535         /*
 536          * Capture file contained a date and time.
 537          * We do this only if this is the very first packet we've seen -
 538          * i.e., if "ascend->adjusted" is false - because
 539          * if we get a date and time after the first packet, we can't
 540          * go back and adjust the time stamps of the packets we've already
 541          * processed, and basing the time stamps of this and following
 542          * packets on the time stamp from the file text rather than the
 543          * ctime of the capture file means times before this and after
 544          * this can't be compared.
 545          */
 546         ascend->inittime = start_time;
 547       }
 548       if (ascend->inittime > secs)
 549         ascend->inittime -= secs;
 550     }
 551     phdr->presence_flags = WTAP_HAS_TS|WTAP_HAS_CAP_LEN;
 552     phdr->ts.secs = secs + ascend->inittime;
 553     phdr->ts.nsecs = usecs * 1000;
 554     phdr->caplen = caplen;
 555     phdr->len = wirelen;
 556
 557     /*
 558      * For these types, the encapsulation we use is not WTAP_ENCAP_ASCEND,
 559      * so set the pseudo-headers appropriately for the type (WTAP_ENCAP_ISDN
 560      * or WTAP_ENCAP_ETHERNET).
 561      */
 562     switch(phdr->pseudo_header.ascend.type) {
 563       case ASCEND_PFX_ISDN_X:
 564         phdr->pseudo_header.isdn.uton = TRUE;
 565         phdr->pseudo_header.isdn.channel = 0;
 566         break;
 567
 568       case ASCEND_PFX_ISDN_R:
 569         phdr->pseudo_header.isdn.uton = FALSE;
 570         phdr->pseudo_header.isdn.channel = 0;
 571         break;
 572
 573       case ASCEND_PFX_ETHER:
 574         phdr->pseudo_header.eth.fcs_len = 0;
 575         break;
 576     }
 577     return PARSED_RECORD;
 578   }
 579
 580   /* Didn't see any data. Still, perhaps the parser was happy.  */
 581   if (retval)
 582     return PARSE_FAILED;
 583   else
 584     return PARSED_NONRECORD;
 585 }
 586
 587 void
 588 yyerror (FILE_T fh _U_, const char *s)
 589 {
 590   ascend_parse_error = s;
 591 }