4 * Copyright (c) 2001 by Marc Milgram <ethereal@mmilgram.NOSPAMmail.net>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24 #include "dbs-etherwatch.h"
25 #include "file_wrappers.h"
32 /* This module reads the text output of the 'DBS-ETHERTRACE' command in VMS
33 * It was initially based on vms.c.
37 Example 'ETHERWATCH' output data (with "printable" characters in the
38 "printable characters" section of the output replaced by "." if they have
39 the 8th bit set, so as not to upset compilers that are expecting text
40 in comments to be in a particular character encoding that can't handle
43 42 names and addresses were loaded
44 Reading recorded data from PERSISTENCE
45 ------------------------------------------------------------------------------
46 From 00-D0-C0-D2-4D-60 [MF1] to AA-00-04-00-FC-94 [PSERVB]
47 Protocol 08-00 00 00-00-00-00-00, 60 byte buffer at 10-OCT-2001 10:20:45.16
48 [E..<8...........]- 0-[45 00 00 3C 38 93 00 00 1D 06 D2 12 80 93 11 1A]
49 [.........(......]- 16-[80 93 80 D6 02 D2 02 03 00 28 A4 90 00 00 00 00]
50 [................]- 32-[A0 02 FF FF 95 BD 00 00 02 04 05 B4 03 03 04 01]
51 [............ ]- 48-[01 01 08 0A 90 90 E5 14 00 00 00 00]
52 ------------------------------------------------------------------------------
53 From 00-D0-C0-D2-4D-60 [MF1] to AA-00-04-00-FC-94 [PSERVB]
54 Protocol 08-00 00 00-00-00-00-00, 50 byte buffer at 10-OCT-2001 10:20:45.17
55 [E..(8......%....]- 0-[45 00 00 28 38 94 00 00 1D 06 D2 25 80 93 11 1A]
56 [.........(..Z.4w]- 16-[80 93 80 D6 02 D2 02 03 00 28 A4 91 5A 1C 34 77]
57 [P.#(.s..........]- 32-[50 10 23 28 C1 73 00 00 02 04 05 B4 03 03 00 00]
61 Alternative HEX only output, slightly more efficient and all wireshark needs:
62 ------------------------------------------------------------------------------
63 From 00-D0-C0-D2-4D-60 [MF1] to AA-00-04-00-FC-94 [PSERVB]
64 Protocol 08-00 00 00-00-00-00-00, 50 byte buffer at 10-OCT-2001 10:20:45.17
65 0-[45 00 00 28 38 9B 00 00 1D 06 D2 1E 80 93 11 1A 80 93 80 D6]
66 20-[02 D2 02 03 00 28 A4 BF 5A 1C 34 79 50 10 23 28 C1 43 00 00]
67 40-[03 30 30 30 30 30 00 00 03 30]
70 /* Magic text to check for DBS-ETHERWATCH-ness of file */
71 static const char dbs_etherwatch_hdr_magic[] =
72 { 'E', 'T', 'H', 'E', 'R', 'W', 'A', 'T', 'C', 'H', ' ', ' '};
73 #define DBS_ETHERWATCH_HDR_MAGIC_SIZE \
74 (sizeof dbs_etherwatch_hdr_magic / sizeof dbs_etherwatch_hdr_magic[0])
76 /* Magic text for start of packet */
77 static const char dbs_etherwatch_rec_magic[] =
78 {'F', 'r', 'o', 'm', ' '};
79 #define DBS_ETHERWATCH_REC_MAGIC_SIZE \
80 (sizeof dbs_etherwatch_rec_magic / sizeof dbs_etherwatch_rec_magic[0])
83 * XXX - is this the biggest packet we can get?
85 #define DBS_ETHERWATCH_MAX_PACKET_LEN 16384
87 static gboolean dbs_etherwatch_read(wtap *wth, int *err, gchar **err_info,
89 static gboolean dbs_etherwatch_seek_read(wtap *wth, gint64 seek_off,
90 struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info);
91 static gboolean parse_dbs_etherwatch_packet(struct wtap_pkthdr *phdr, FILE_T fh,
92 Buffer* buf, int *err, gchar **err_info);
93 static guint parse_single_hex_dump_line(char* rec, guint8 *buf,
95 static guint parse_hex_dump(char* dump, guint8 *buf, char seperator, char end);
97 /* Seeks to the beginning of the next packet, and returns the
98 byte offset. Returns -1 on failure, and sets "*err" to the error
99 and "*err_info" to null or an additional error string. */
100 static gint64 dbs_etherwatch_seek_next_packet(wtap *wth, int *err,
104 unsigned int level = 0;
107 while ((byte = file_getc(wth->fh)) != EOF) {
108 if (byte == dbs_etherwatch_rec_magic[level]) {
110 if (level >= DBS_ETHERWATCH_REC_MAGIC_SIZE) {
111 /* note: we're leaving file pointer right after the magic characters */
112 cur_off = file_tell(wth->fh);
115 *err = file_error(wth->fh, err_info);
125 *err = file_error(wth->fh, err_info);
129 #define DBS_ETHERWATCH_HEADER_LINES_TO_CHECK 200
130 #define DBS_ETHERWATCH_LINE_LENGTH 240
132 /* Look through the first part of a file to see if this is
133 * a DBS Ethertrace text trace file.
135 * Returns TRUE if it is, FALSE if it isn't or if we get an I/O error;
136 * if we get an I/O error, "*err" will be set to a non-zero value and
137 * "*err_info" will be set to null or an error string.
139 static gboolean dbs_etherwatch_check_file_type(wtap *wth, int *err,
142 char buf[DBS_ETHERWATCH_LINE_LENGTH];
145 unsigned int i, level;
147 buf[DBS_ETHERWATCH_LINE_LENGTH-1] = 0;
149 for (line = 0; line < DBS_ETHERWATCH_HEADER_LINES_TO_CHECK; line++) {
150 if (file_gets(buf, DBS_ETHERWATCH_LINE_LENGTH, wth->fh) == NULL) {
152 *err = file_error(wth->fh, err_info);
156 reclen = strlen(buf);
157 if (reclen < DBS_ETHERWATCH_HDR_MAGIC_SIZE)
161 for (i = 0; i < reclen; i++) {
163 if (byte == dbs_etherwatch_hdr_magic[level]) {
166 DBS_ETHERWATCH_HDR_MAGIC_SIZE) {
179 int dbs_etherwatch_open(wtap *wth, int *err, gchar **err_info)
181 /* Look for DBS ETHERWATCH header */
182 if (!dbs_etherwatch_check_file_type(wth, err, err_info)) {
183 if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
188 wth->file_encap = WTAP_ENCAP_ETHERNET;
189 wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_DBS_ETHERWATCH;
190 wth->snapshot_length = 0; /* not known */
191 wth->subtype_read = dbs_etherwatch_read;
192 wth->subtype_seek_read = dbs_etherwatch_seek_read;
193 wth->tsprecision = WTAP_FILE_TSPREC_CSEC;
198 /* Find the next packet and parse it; called from wtap_read(). */
199 static gboolean dbs_etherwatch_read(wtap *wth, int *err, gchar **err_info,
204 /* Find the next packet */
205 offset = dbs_etherwatch_seek_next_packet(wth, err, err_info);
208 *data_offset = offset;
210 /* Parse the packet */
211 return parse_dbs_etherwatch_packet(&wth->phdr, wth->fh,
212 wth->frame_buffer, err, err_info);
215 /* Used to read packets in random-access fashion */
217 dbs_etherwatch_seek_read(wtap *wth, gint64 seek_off,
218 struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info)
220 if (file_seek(wth->random_fh, seek_off - 1, SEEK_SET, err) == -1)
223 return parse_dbs_etherwatch_packet(phdr, wth->random_fh, buf, err,
231 0123456789012345678901234567890123456789012345
232 From 00-D0-C0-D2-4D-60 [MF1] to AA-00-04-00-FC-94 [PSERVB]
233 Protocol 08-00 00 00-00-00-00-00, 50 byte buffer at 10-OCT-2001 10:20:45.17
235 #define MAC_ADDR_LENGTH 6 /* Length MAC address */
236 #define DEST_MAC_PREFIX "] to " /* Prefix to the dest. MAC address */
237 #define PROTOCOL_LENGTH 2 /* Length protocol */
238 #define PROTOCOL_POS 9 /* Position protocol */
239 #define SAP_LENGTH 2 /* Length DSAP+SSAP */
240 #define SAP_POS 9 /* Position DSAP+SSAP */
241 #define CTL_UNNUMB_LENGTH 1 /* Length unnumbered control field */
242 #define CTL_NUMB_LENGTH 2 /* Length numbered control field */
243 #define CTL_POS 15 /* Position control field */
244 #define PID_LENGTH 5 /* Length PID */
245 #define PID_POS 18 /* Position PID */
246 #define LENGTH_POS 33 /* Position length */
247 #define HEX_HDR_SPR '-' /* Seperator char header hex values */
248 #define HEX_HDR_END ' ' /* End char hdr. hex val. except PID */
249 #define HEX_PID_END ',' /* End char PID hex value */
250 #define IEEE802_LEN_LEN 2 /* Length of the IEEE 802 len. field */
252 To check whether it is Ethernet II or IEEE 802 we check the values of the
253 control field and PID, when they are all 0's we assume it is Ethernet II
254 else IEEE 802. In IEEE 802 the DSAP and SSAP are behind protocol, the
255 length in the IEEE data we have to construct.
257 #define ETH_II_CHECK_POS 15
258 #define ETH_II_CHECK_STR "00 00-00-00-00-00,"
260 To check whether it IEEE 802.3 with SNAP we check that both the DSAP & SSAP
261 values are 0xAA and the control field 0x03.
263 #define SNAP_CHECK_POS 9
264 #define SNAP_CHECK_STR "AA-AA 03"
266 To check whether the control field is 1 or two octets we check if it is
267 unnumbered. Unnumbered has length 1, numbered 2.
269 #define CTL_UNNUMB_MASK 0x03
270 #define CTL_UNNUMB_VALUE 0x03
272 parse_dbs_etherwatch_packet(struct wtap_pkthdr *phdr, FILE_T fh, Buffer* buf,
273 int *err, gchar **err_info)
276 char line[DBS_ETHERWATCH_LINE_LENGTH];
277 int num_items_scanned;
278 int eth_hdr_len, pkt_len, csec;
279 int length_pos, length_from, length;
283 static const gchar months[] = "JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC";
284 int count, line_count;
286 /* Make sure we have enough room for the packet */
287 buffer_assure_space(buf, DBS_ETHERWATCH_MAX_PACKET_LEN);
288 pd = buffer_start_ptr(buf);
291 memset(&tm, 0, sizeof(tm));
292 /* Our file pointer should be on the first line containing the
293 * summary information for a packet. Read in that line and
294 * extract the useful information
296 if (file_gets(line, DBS_ETHERWATCH_LINE_LENGTH, fh) == NULL) {
297 *err = file_error(fh, err_info);
299 *err = WTAP_ERR_SHORT_READ;
304 /* Get the destination address */
305 p = strstr(line, DEST_MAC_PREFIX);
307 *err = WTAP_ERR_BAD_FILE;
308 *err_info = g_strdup("dbs_etherwatch: destination address not found");
311 p += strlen(DEST_MAC_PREFIX);
312 if(parse_hex_dump(p, &pd[eth_hdr_len], HEX_HDR_SPR, HEX_HDR_END)
313 != MAC_ADDR_LENGTH) {
314 *err = WTAP_ERR_BAD_FILE;
315 *err_info = g_strdup("dbs_etherwatch: destination address not valid");
318 eth_hdr_len += MAC_ADDR_LENGTH;
320 /* Get the source address */
322 * Since the first part of the line is already skipped in order to find
323 * the start of the record we cannot index, just look for the first
327 while(!isxdigit((guchar)*p)) {
330 if(parse_hex_dump(p, &pd[eth_hdr_len], HEX_HDR_SPR,
331 HEX_HDR_END) != MAC_ADDR_LENGTH) {
332 *err = WTAP_ERR_BAD_FILE;
333 *err_info = g_strdup("dbs_etherwatch: source address not valid");
336 eth_hdr_len += MAC_ADDR_LENGTH;
338 /* Read the next line of the record header */
339 if (file_gets(line, DBS_ETHERWATCH_LINE_LENGTH, fh) == NULL) {
340 *err = file_error(fh, err_info);
342 *err = WTAP_ERR_SHORT_READ;
347 /* Check the lines is as least as long as the length position */
348 if(strlen(line) < LENGTH_POS) {
349 *err = WTAP_ERR_BAD_FILE;
350 *err_info = g_strdup("dbs_etherwatch: line too short");
354 num_items_scanned = sscanf(line + LENGTH_POS,
355 "%9d byte buffer at %2d-%3s-%4d %2d:%2d:%2d.%9d",
358 &tm.tm_year, &tm.tm_hour, &tm.tm_min,
361 if (num_items_scanned != 8) {
362 *err = WTAP_ERR_BAD_FILE;
363 *err_info = g_strdup("dbs_etherwatch: header line not valid");
367 /* Determine whether it is Ethernet II or IEEE 802 */
368 if(strncmp(&line[ETH_II_CHECK_POS], ETH_II_CHECK_STR,
369 strlen(ETH_II_CHECK_STR)) == 0) {
371 /* Get the Protocol */
372 if(parse_hex_dump(&line[PROTOCOL_POS], &pd[eth_hdr_len], HEX_HDR_SPR,
373 HEX_HDR_END) != PROTOCOL_LENGTH) {
374 *err = WTAP_ERR_BAD_FILE;
375 *err_info = g_strdup("dbs_etherwatch: Ethernet II protocol value not valid");
378 eth_hdr_len += PROTOCOL_LENGTH;
381 /* Remember where to put the length in the header */
382 length_pos = eth_hdr_len;
383 /* Leave room in the header for the length */
384 eth_hdr_len += IEEE802_LEN_LEN;
385 /* Remember how much of the header should not be added to the length */
386 length_from = eth_hdr_len;
387 /* Get the DSAP + SSAP */
388 if(parse_hex_dump(&line[SAP_POS], &pd[eth_hdr_len], HEX_HDR_SPR,
389 HEX_HDR_END) != SAP_LENGTH) {
390 *err = WTAP_ERR_BAD_FILE;
391 *err_info = g_strdup("dbs_etherwatch: 802.2 DSAP+SSAP value not valid");
394 eth_hdr_len += SAP_LENGTH;
395 /* Get the (first part of the) control field */
396 if(parse_hex_dump(&line[CTL_POS], &pd[eth_hdr_len], HEX_HDR_SPR,
397 HEX_HDR_END) != CTL_UNNUMB_LENGTH) {
398 *err = WTAP_ERR_BAD_FILE;
399 *err_info = g_strdup("dbs_etherwatch: 802.2 control field first part not valid");
402 /* Determine whether the control is numbered, and thus longer */
403 if((pd[eth_hdr_len] & CTL_UNNUMB_MASK) != CTL_UNNUMB_VALUE) {
404 /* Get the rest of the control field, the first octet in the PID */
405 if(parse_hex_dump(&line[PID_POS],
406 &pd[eth_hdr_len + CTL_UNNUMB_LENGTH], HEX_HDR_END,
407 HEX_HDR_SPR) != CTL_NUMB_LENGTH - CTL_UNNUMB_LENGTH) {
408 *err = WTAP_ERR_BAD_FILE;
409 *err_info = g_strdup("dbs_etherwatch: 802.2 control field second part value not valid");
412 eth_hdr_len += CTL_NUMB_LENGTH;
414 eth_hdr_len += CTL_UNNUMB_LENGTH;
416 /* Determine whether it is SNAP */
417 if(strncmp(&line[SNAP_CHECK_POS], SNAP_CHECK_STR,
418 strlen(SNAP_CHECK_STR)) == 0) {
420 if(parse_hex_dump(&line[PID_POS], &pd[eth_hdr_len], HEX_HDR_SPR,
421 HEX_PID_END) != PID_LENGTH) {
422 *err = WTAP_ERR_BAD_FILE;
423 *err_info = g_strdup("dbs_etherwatch: 802.2 PID value not valid");
426 eth_hdr_len += PID_LENGTH;
428 /* Write the length in the header */
429 length = eth_hdr_len - length_from + pkt_len;
430 pd[length_pos] = (length) >> 8;
431 pd[length_pos+1] = (length) & 0xFF;
434 phdr->presence_flags = WTAP_HAS_TS|WTAP_HAS_CAP_LEN;
436 p = strstr(months, mon);
438 tm.tm_mon = (int)(p - months) / 3;
442 phdr->ts.secs = mktime(&tm);
443 phdr->ts.nsecs = csec * 10000000;
444 phdr->caplen = eth_hdr_len + pkt_len;
445 phdr->len = eth_hdr_len + pkt_len;
448 * We don't have an FCS in this frame.
450 phdr->pseudo_header.eth.fcs_len = 0;
452 /* Parse the hex dump */
454 while (count < pkt_len) {
455 if (file_gets(line, DBS_ETHERWATCH_LINE_LENGTH, fh) == NULL) {
456 *err = file_error(fh, err_info);
458 *err = WTAP_ERR_SHORT_READ;
462 if (!(line_count = parse_single_hex_dump_line(line,
463 &pd[eth_hdr_len + count], count))) {
464 *err = WTAP_ERR_BAD_FILE;
465 *err_info = g_strdup("dbs_etherwatch: packet data value not valid");
469 if (count > pkt_len) {
470 *err = WTAP_ERR_BAD_FILE;
471 *err_info = g_strdup("dbs_etherwatch: packet data value has too many bytes");
478 /* Parse a hex dump line */
480 /DISPLAY=BOTH output:
483 0123456789012345678901234567890123456789012345
484 [E..(8...........]- 0-[45 00 00 28 38 9B 00 00 1D 06 D2 1E 80 93 11 1A]
485 [.........(..Z.4y]- 16-[80 93 80 D6 02 D2 02 03 00 28 A4 BF 5A 1C 34 79]
486 [P.#(.C...00000..]- 32-[50 10 23 28 C1 43 00 00 03 30 30 30 30 30 00 00]
489 /DISPLAY=HEXADECIMAL output:
492 0123456789012345678901234567890123456789012345
493 0-[45 00 00 28 38 9B 00 00 1D 06 D2 1E 80 93 11 1A 80 93 80 D6]
494 20-[02 D2 02 03 00 28 A4 BF 5A 1C 34 79 50 10 23 28 C1 43 00 00]
495 40-[03 30 30 30 30 30 00 00 03 30]
499 #define TYPE_CHECK_POS 2 /* Position to check the type of hex dump */
500 #define TYPE_CHECK_BOTH '[' /* Value at pos. that indicates BOTH type */
501 #define COUNT_POS_BOTH 21 /* Count position BOTH type */
502 #define COUNT_POS_HEX 1 /* Count position HEX type */
503 #define COUNT_SIZE 5 /* Length counter */
504 #define HEX_DUMP_START '[' /* Start char */
505 #define HEX_DUMP_SPR ' ' /* Seperator char */
506 #define HEX_DUMP_END ']' /* End char */
508 /* Take a string representing one line from a hex dump and converts the
509 * text to binary data. We check the printed offset with the offset
510 * we are passed to validate the record. We place the bytes in the buffer
511 * at the specified offset.
513 * Returns length parsed if a good hex dump, 0 if bad.
516 parse_single_hex_dump_line(char* rec, guint8 *buf, int byte_offset) {
522 /* Check that the record is as least as long as the check offset */
523 for(i = 0; i < TYPE_CHECK_POS; i++)
529 /* determine the format and thus the counter offset and hex dump length */
530 if(rec[TYPE_CHECK_POS] == TYPE_CHECK_BOTH)
532 pos = COUNT_POS_BOTH;
539 /* Check that the record is as least as long as the start position */
548 /* Get the byte_offset directly from the record */
550 for(i = 0; i < COUNT_SIZE; i++) {
551 if(!isspace((guchar)rec[pos])) {
552 if(isdigit((guchar)rec[pos])) {
554 value += rec[pos] - '0';
562 if (value != byte_offset) {
566 /* find the start of the hex dump */
567 while(rec[pos] != HEX_DUMP_START) {
568 if(rec[pos] == '\0') {
574 return parse_hex_dump(&rec[pos], buf, HEX_DUMP_SPR, HEX_DUMP_END);
577 /* Parse a hex dump */
579 parse_hex_dump(char* dump, guint8 *buf, char seperator, char end) {
582 /* Parse the hex dump */
585 while(dump[pos] != end) {
586 /* Check the hex value */
587 if(!(isxdigit((guchar)dump[pos]) &&
588 isxdigit((guchar)dump[pos + 1]))) {
591 /* Get the hex value value */
592 if(isdigit((guchar)dump[pos])) {
593 buf[count] = (dump[pos] - '0') << 4;
595 buf[count] = (toupper(dump[pos]) - 'A' + 10) << 4;
598 if(isdigit((guchar)dump[pos])) {
599 buf[count] += dump[pos] - '0';
601 buf[count] += toupper(dump[pos]) - 'A' + 10;
605 /* Skip the seperator characters */
606 while(dump[pos] == seperator) {