6 * Copyright (c) 2001 by Marc Milgram <ethereal@mmilgram.NOSPAMmail.net>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
28 #include "dbs-etherwatch.h"
29 #include "file_wrappers.h"
36 /* This module reads the text output of the 'DBS-ETHERTRACE' command in VMS
37 * It was initially based on vms.c.
41 Example 'ETHERWATCH' output data (with "printable" characters in the
42 "printable characters" section of the output replaced by "." if they have
43 the 8th bit set, so as not to upset compilers that are expecting text
44 in comments to be in a particular character encoding that can't handle
47 42 names and addresses were loaded
48 Reading recorded data from PERSISTENCE
49 ------------------------------------------------------------------------------
50 From 00-D0-C0-D2-4D-60 [MF1] to AA-00-04-00-FC-94 [PSERVB]
51 Protocol 08-00 00 00-00-00-00-00, 60 byte buffer at 10-OCT-2001 10:20:45.16
52 [E..<8...........]- 0-[45 00 00 3C 38 93 00 00 1D 06 D2 12 80 93 11 1A]
53 [.........(......]- 16-[80 93 80 D6 02 D2 02 03 00 28 A4 90 00 00 00 00]
54 [................]- 32-[A0 02 FF FF 95 BD 00 00 02 04 05 B4 03 03 04 01]
55 [............ ]- 48-[01 01 08 0A 90 90 E5 14 00 00 00 00]
56 ------------------------------------------------------------------------------
57 From 00-D0-C0-D2-4D-60 [MF1] to AA-00-04-00-FC-94 [PSERVB]
58 Protocol 08-00 00 00-00-00-00-00, 50 byte buffer at 10-OCT-2001 10:20:45.17
59 [E..(8......%....]- 0-[45 00 00 28 38 94 00 00 1D 06 D2 25 80 93 11 1A]
60 [.........(..Z.4w]- 16-[80 93 80 D6 02 D2 02 03 00 28 A4 91 5A 1C 34 77]
61 [P.#(.s..........]- 32-[50 10 23 28 C1 73 00 00 02 04 05 B4 03 03 00 00]
65 Alternative HEX only output, slightly more efficient and all wireshark needs:
66 ------------------------------------------------------------------------------
67 From 00-D0-C0-D2-4D-60 [MF1] to AA-00-04-00-FC-94 [PSERVB]
68 Protocol 08-00 00 00-00-00-00-00, 50 byte buffer at 10-OCT-2001 10:20:45.17
69 0-[45 00 00 28 38 9B 00 00 1D 06 D2 1E 80 93 11 1A 80 93 80 D6]
70 20-[02 D2 02 03 00 28 A4 BF 5A 1C 34 79 50 10 23 28 C1 43 00 00]
71 40-[03 30 30 30 30 30 00 00 03 30]
74 /* Magic text to check for DBS-ETHERWATCH-ness of file */
75 static const char dbs_etherwatch_hdr_magic[] =
76 { 'E', 'T', 'H', 'E', 'R', 'W', 'A', 'T', 'C', 'H', ' ', ' '};
77 #define DBS_ETHERWATCH_HDR_MAGIC_SIZE \
78 (sizeof dbs_etherwatch_hdr_magic / sizeof dbs_etherwatch_hdr_magic[0])
80 /* Magic text for start of packet */
81 static const char dbs_etherwatch_rec_magic[] =
82 {'F', 'r', 'o', 'm', ' '};
83 #define DBS_ETHERWATCH_REC_MAGIC_SIZE \
84 (sizeof dbs_etherwatch_rec_magic / sizeof dbs_etherwatch_rec_magic[0])
87 * XXX - is this the biggest packet we can get?
89 #define DBS_ETHERWATCH_MAX_PACKET_LEN 16384
91 static gboolean dbs_etherwatch_read(wtap *wth, int *err, gchar **err_info,
93 static gboolean dbs_etherwatch_seek_read(wtap *wth, gint64 seek_off,
94 union wtap_pseudo_header *pseudo_header, guint8 *pd, int len,
95 int *err, gchar **err_info);
96 static int parse_dbs_etherwatch_packet(wtap *wth, FILE_T fh, guint8* buf,
97 int *err, gchar **err_info);
98 static guint parse_single_hex_dump_line(char* rec, guint8 *buf,
100 static guint parse_hex_dump(char* dump, guint8 *buf, char seperator, char end);
102 /* Seeks to the beginning of the next packet, and returns the
103 byte offset. Returns -1 on failure, and sets "*err" to the error. */
104 static gint64 dbs_etherwatch_seek_next_packet(wtap *wth, int *err)
107 unsigned int level = 0;
110 while ((byte = file_getc(wth->fh)) != EOF) {
111 if (byte == dbs_etherwatch_rec_magic[level]) {
113 if (level >= DBS_ETHERWATCH_REC_MAGIC_SIZE) {
114 /* note: we're leaving file pointer right after the magic characters */
115 cur_off = file_tell(wth->fh);
118 *err = file_error(wth->fh);
127 if (file_eof(wth->fh)) {
131 /* We (presumably) got an error (there's no equivalent to "ferror()"
132 in zlib, alas, so we don't have a wrapper to check for an error). */
133 *err = file_error(wth->fh);
138 #define DBS_ETHERWATCH_HEADER_LINES_TO_CHECK 200
139 #define DBS_ETHERWATCH_LINE_LENGTH 240
141 /* Look through the first part of a file to see if this is
142 * a DBS Ethertrace text trace file.
144 * Returns TRUE if it is, FALSE if it isn't or if we get an I/O error;
145 * if we get an I/O error, "*err" will be set to a non-zero value.
147 static gboolean dbs_etherwatch_check_file_type(wtap *wth, int *err)
149 char buf[DBS_ETHERWATCH_LINE_LENGTH];
152 unsigned int i, level;
154 buf[DBS_ETHERWATCH_LINE_LENGTH-1] = 0;
156 for (line = 0; line < DBS_ETHERWATCH_HEADER_LINES_TO_CHECK; line++) {
157 if (file_gets(buf, DBS_ETHERWATCH_LINE_LENGTH, wth->fh)!=NULL){
159 reclen = strlen(buf);
160 if (reclen < DBS_ETHERWATCH_HDR_MAGIC_SIZE)
164 for (i = 0; i < reclen; i++) {
166 if (byte == dbs_etherwatch_hdr_magic[level]) {
169 DBS_ETHERWATCH_HDR_MAGIC_SIZE) {
179 if (file_eof(wth->fh))
182 *err = file_error(wth->fh);
191 int dbs_etherwatch_open(wtap *wth, int *err, gchar **err_info _U_)
193 /* Look for DBS ETHERWATCH header */
194 if (!dbs_etherwatch_check_file_type(wth, err)) {
201 wth->data_offset = 0;
202 wth->file_encap = WTAP_ENCAP_ETHERNET;
203 wth->file_type = WTAP_FILE_DBS_ETHERWATCH;
204 wth->snapshot_length = 0; /* not known */
205 wth->subtype_read = dbs_etherwatch_read;
206 wth->subtype_seek_read = dbs_etherwatch_seek_read;
207 wth->tsprecision = WTAP_FILE_TSPREC_CSEC;
212 /* Find the next packet and parse it; called from wtap_read(). */
213 static gboolean dbs_etherwatch_read(wtap *wth, int *err, gchar **err_info,
220 /* Find the next packet */
221 offset = dbs_etherwatch_seek_next_packet(wth, err);
225 /* Make sure we have enough room for the packet */
226 buffer_assure_space(wth->frame_buffer, DBS_ETHERWATCH_MAX_PACKET_LEN);
227 buf = buffer_start_ptr(wth->frame_buffer);
229 /* Parse the packet */
230 pkt_len = parse_dbs_etherwatch_packet(wth, wth->fh, buf, err, err_info);
235 * We don't have an FCS in this frame.
237 wth->pseudo_header.eth.fcs_len = 0;
239 wth->data_offset = offset;
240 *data_offset = offset;
244 /* Used to read packets in random-access fashion */
246 dbs_etherwatch_seek_read (wtap *wth, gint64 seek_off,
247 union wtap_pseudo_header *pseudo_header _U_,
248 guint8 *pd, int len, int *err, gchar **err_info)
252 if (file_seek(wth->random_fh, seek_off - 1, SEEK_SET, err) == -1)
255 pkt_len = parse_dbs_etherwatch_packet(NULL, wth->random_fh, pd, err,
258 if (pkt_len != len) {
260 *err = WTAP_ERR_BAD_RECORD;
261 *err_info = g_strdup_printf("dbs_etherwatch: packet length %d doesn't match requested length %d",
268 * We don't have an FCS in this frame.
270 pseudo_header->eth.fcs_len = 0;
279 0123456789012345678901234567890123456789012345
280 From 00-D0-C0-D2-4D-60 [MF1] to AA-00-04-00-FC-94 [PSERVB]
281 Protocol 08-00 00 00-00-00-00-00, 50 byte buffer at 10-OCT-2001 10:20:45.17
283 #define MAC_ADDR_LENGTH 6 /* Length MAC address */
284 #define DEST_MAC_PREFIX "] to " /* Prefix to the dest. MAC address */
285 #define PROTOCOL_LENGTH 2 /* Length protocol */
286 #define PROTOCOL_POS 9 /* Position protocol */
287 #define SAP_LENGTH 2 /* Length DSAP+SSAP */
288 #define SAP_POS 9 /* Position DSAP+SSAP */
289 #define CTL_UNNUMB_LENGTH 1 /* Length unnumbered control field */
290 #define CTL_NUMB_LENGTH 2 /* Length numbered control field */
291 #define CTL_POS 15 /* Position control field */
292 #define PID_LENGTH 5 /* Length PID */
293 #define PID_POS 18 /* Position PID */
294 #define LENGTH_POS 33 /* Position length */
295 #define HEX_HDR_SPR '-' /* Seperator char header hex values */
296 #define HEX_HDR_END ' ' /* End char hdr. hex val. except PID */
297 #define HEX_PID_END ',' /* End char PID hex value */
298 #define IEEE802_LEN_LEN 2 /* Length of the IEEE 802 len. field */
300 To check whether it is Ethernet II or IEEE 802 we check the values of the
301 control field and PID, when they are all 0's we assume it is Ethernet II
302 else IEEE 802. In IEEE 802 the DSAP and SSAP are behind protocol, the
303 length in the IEEE data we have to construct.
305 #define ETH_II_CHECK_POS 15
306 #define ETH_II_CHECK_STR "00 00-00-00-00-00,"
308 To check whether it IEEE 802.3 with SNAP we check that both the DSAP & SSAP
309 values are 0xAA and the control field 0x03.
311 #define SNAP_CHECK_POS 9
312 #define SNAP_CHECK_STR "AA-AA 03"
314 To check whether the control field is 1 or two octets we check if it is
315 unnumbered. Unnumbered has length 1, numbered 2.
317 #define CTL_UNNUMB_MASK 0x03
318 #define CTL_UNNUMB_VALUE 0x03
320 parse_dbs_etherwatch_packet(wtap *wth, FILE_T fh, guint8* buf, int *err,
323 char line[DBS_ETHERWATCH_LINE_LENGTH];
324 int num_items_scanned;
325 int eth_hdr_len, pkt_len, csec;
326 int length_pos, length_from, length;
330 static gchar months[] = "JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC";
331 int count, line_count;
334 /* Our file pointer should be on the first line containing the
335 * summary information for a packet. Read in that line and
336 * extract the useful information
338 if (file_gets(line, DBS_ETHERWATCH_LINE_LENGTH, fh) == NULL) {
339 *err = file_error(fh);
341 *err = WTAP_ERR_SHORT_READ;
346 /* Get the destination address */
347 p = strstr(line, DEST_MAC_PREFIX);
349 *err = WTAP_ERR_BAD_RECORD;
350 *err_info = g_strdup("dbs_etherwatch: destination address not found");
353 p += strlen(DEST_MAC_PREFIX);
354 if(parse_hex_dump(p, &buf[eth_hdr_len], HEX_HDR_SPR, HEX_HDR_END)
355 != MAC_ADDR_LENGTH) {
356 *err = WTAP_ERR_BAD_RECORD;
357 *err_info = g_strdup("dbs_etherwatch: destination address not valid");
360 eth_hdr_len += MAC_ADDR_LENGTH;
362 /* Get the source address */
364 * Since the first part of the line is already skipped in order to find
365 * the start of the record we cannot index, just look for the first
369 while(!isxdigit((guchar)*p)) {
372 if(parse_hex_dump(p, &buf[eth_hdr_len], HEX_HDR_SPR,
373 HEX_HDR_END) != MAC_ADDR_LENGTH) {
374 *err = WTAP_ERR_BAD_RECORD;
375 *err_info = g_strdup("dbs_etherwatch: source address not valid");
378 eth_hdr_len += MAC_ADDR_LENGTH;
380 /* Read the next line of the record header */
381 if (file_gets(line, DBS_ETHERWATCH_LINE_LENGTH, fh) == NULL) {
382 *err = file_error(fh);
384 *err = WTAP_ERR_SHORT_READ;
389 /* Check the lines is as least as long as the length position */
390 if(strlen(line) < LENGTH_POS) {
391 *err = WTAP_ERR_BAD_RECORD;
392 *err_info = g_strdup("dbs_etherwatch: line too short");
396 num_items_scanned = sscanf(line + LENGTH_POS,
397 "%d byte buffer at %d-%3s-%d %d:%d:%d.%d",
400 &tm.tm_year, &tm.tm_hour, &tm.tm_min,
403 if (num_items_scanned != 8) {
404 *err = WTAP_ERR_BAD_RECORD;
405 *err_info = g_strdup("dbs_etherwatch: header line not valid");
409 /* Determine whether it is Ethernet II or IEEE 802 */
410 if(strncmp(&line[ETH_II_CHECK_POS], ETH_II_CHECK_STR,
411 strlen(ETH_II_CHECK_STR)) == 0) {
413 /* Get the Protocol */
414 if(parse_hex_dump(&line[PROTOCOL_POS], &buf[eth_hdr_len], HEX_HDR_SPR,
415 HEX_HDR_END) != PROTOCOL_LENGTH) {
416 *err = WTAP_ERR_BAD_RECORD;
417 *err_info = g_strdup("dbs_etherwatch: Ethernet II protocol value not valid");
420 eth_hdr_len += PROTOCOL_LENGTH;
423 /* Remember where to put the length in the header */
424 length_pos = eth_hdr_len;
425 /* Leave room in the header for the length */
426 eth_hdr_len += IEEE802_LEN_LEN;
427 /* Remember how much of the header should not be added to the length */
428 length_from = eth_hdr_len;
429 /* Get the DSAP + SSAP */
430 if(parse_hex_dump(&line[SAP_POS], &buf[eth_hdr_len], HEX_HDR_SPR,
431 HEX_HDR_END) != SAP_LENGTH) {
432 *err = WTAP_ERR_BAD_RECORD;
433 *err_info = g_strdup("dbs_etherwatch: 802.2 DSAP+SSAP value not valid");
436 eth_hdr_len += SAP_LENGTH;
437 /* Get the (first part of the) control field */
438 if(parse_hex_dump(&line[CTL_POS], &buf[eth_hdr_len], HEX_HDR_SPR,
439 HEX_HDR_END) != CTL_UNNUMB_LENGTH) {
440 *err = WTAP_ERR_BAD_RECORD;
441 *err_info = g_strdup("dbs_etherwatch: 802.2 control field first part not valid");
444 /* Determine whether the control is numbered, and thus longer */
445 if((buf[eth_hdr_len] & CTL_UNNUMB_MASK) != CTL_UNNUMB_VALUE) {
446 /* Get the rest of the control field, the first octet in the PID */
447 if(parse_hex_dump(&line[PID_POS],
448 &buf[eth_hdr_len + CTL_UNNUMB_LENGTH], HEX_HDR_END,
449 HEX_HDR_SPR) != CTL_NUMB_LENGTH - CTL_UNNUMB_LENGTH) {
450 *err = WTAP_ERR_BAD_RECORD;
451 *err_info = g_strdup("dbs_etherwatch: 802.2 control field second part value not valid");
454 eth_hdr_len += CTL_NUMB_LENGTH;
456 eth_hdr_len += CTL_UNNUMB_LENGTH;
458 /* Determine whether it is SNAP */
459 if(strncmp(&line[SNAP_CHECK_POS], SNAP_CHECK_STR,
460 strlen(SNAP_CHECK_STR)) == 0) {
462 if(parse_hex_dump(&line[PID_POS], &buf[eth_hdr_len], HEX_HDR_SPR,
463 HEX_PID_END) != PID_LENGTH) {
464 *err = WTAP_ERR_BAD_RECORD;
465 *err_info = g_strdup("dbs_etherwatch: 802.2 PID value not valid");
468 eth_hdr_len += PID_LENGTH;
470 /* Write the length in the header */
471 length = eth_hdr_len - length_from + pkt_len;
472 buf[length_pos] = (length) >> 8;
473 buf[length_pos+1] = (length) & 0xFF;
477 p = strstr(months, mon);
479 tm.tm_mon = (int)(p - months) / 3;
483 wth->phdr.ts.secs = mktime(&tm);
484 wth->phdr.ts.nsecs = csec * 10000000;
485 wth->phdr.caplen = eth_hdr_len + pkt_len;
486 wth->phdr.len = eth_hdr_len + pkt_len;
489 /* Parse the hex dump */
491 while (count < pkt_len) {
492 if (file_gets(line, DBS_ETHERWATCH_LINE_LENGTH, fh) == NULL) {
493 *err = file_error(fh);
495 *err = WTAP_ERR_SHORT_READ;
499 if (!(line_count = parse_single_hex_dump_line(line,
500 &buf[eth_hdr_len + count], count))) {
501 *err = WTAP_ERR_BAD_RECORD;
502 *err_info = g_strdup("dbs_etherwatch: packet data value not valid");
506 if (count > pkt_len) {
507 *err = WTAP_ERR_BAD_RECORD;
508 *err_info = g_strdup("dbs_etherwatch: packet data value has too many bytes");
512 return eth_hdr_len + pkt_len;
515 /* Parse a hex dump line */
517 /DISPLAY=BOTH output:
520 0123456789012345678901234567890123456789012345
521 [E..(8...........]- 0-[45 00 00 28 38 9B 00 00 1D 06 D2 1E 80 93 11 1A]
522 [.........(..Z.4y]- 16-[80 93 80 D6 02 D2 02 03 00 28 A4 BF 5A 1C 34 79]
523 [P.#(.C...00000..]- 32-[50 10 23 28 C1 43 00 00 03 30 30 30 30 30 00 00]
526 /DISPLAY=HEXADECIMAL output:
529 0123456789012345678901234567890123456789012345
530 0-[45 00 00 28 38 9B 00 00 1D 06 D2 1E 80 93 11 1A 80 93 80 D6]
531 20-[02 D2 02 03 00 28 A4 BF 5A 1C 34 79 50 10 23 28 C1 43 00 00]
532 40-[03 30 30 30 30 30 00 00 03 30]
536 #define TYPE_CHECK_POS 2 /* Position to check the type of hex dump */
537 #define TYPE_CHECK_BOTH '[' /* Value at pos. that indicates BOTH type */
538 #define COUNT_POS_BOTH 21 /* Count position BOTH type */
539 #define COUNT_POS_HEX 1 /* Count position HEX type */
540 #define COUNT_SIZE 5 /* Length counter */
541 #define HEX_DUMP_START '[' /* Start char */
542 #define HEX_DUMP_SPR ' ' /* Seperator char */
543 #define HEX_DUMP_END ']' /* End char */
545 /* Take a string representing one line from a hex dump and converts the
546 * text to binary data. We check the printed offset with the offset
547 * we are passed to validate the record. We place the bytes in the buffer
548 * at the specified offset.
550 * Returns length parsed if a good hex dump, 0 if bad.
553 parse_single_hex_dump_line(char* rec, guint8 *buf, int byte_offset) {
559 /* Check that the record is as least as long as the check offset */
560 for(i = 0; i < TYPE_CHECK_POS; i++)
566 /* determine the format and thus the counter offset and hex dump length */
567 if(rec[TYPE_CHECK_POS] == TYPE_CHECK_BOTH)
569 pos = COUNT_POS_BOTH;
576 /* Check that the record is as least as long as the start position */
585 /* Get the byte_offset directly from the record */
587 for(i = 0; i < COUNT_SIZE; i++) {
588 if(!isspace((guchar)rec[pos])) {
589 if(isdigit((guchar)rec[pos])) {
591 value += rec[pos] - '0';
599 if (value != byte_offset) {
603 /* find the start of the hex dump */
604 while(rec[pos] != HEX_DUMP_START) {
605 if(rec[pos] == '\0') {
611 return parse_hex_dump(&rec[pos], buf, HEX_DUMP_SPR, HEX_DUMP_END);
614 /* Parse a hex dump */
616 parse_hex_dump(char* dump, guint8 *buf, char seperator, char end) {
619 /* Parse the hex dump */
622 while(dump[pos] != end) {
623 /* Check the hex value */
624 if(!(isxdigit((guchar)dump[pos]) &&
625 isxdigit((guchar)dump[pos + 1]))) {
628 /* Get the hex value value */
629 if(isdigit((guchar)dump[pos])) {
630 buf[count] = (dump[pos] - '0') << 4;
632 buf[count] = (toupper(dump[pos]) - 'A' + 10) << 4;
635 if(isdigit((guchar)dump[pos])) {
636 buf[count] += dump[pos] - '0';
638 buf[count] += toupper(dump[pos]) - 'A' + 10;
642 /* Skip the seperator characters */
643 while(dump[pos] == seperator) {