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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
26 #include "dbs-etherwatch.h"
27 #include "file_wrappers.h"
34 /* This module reads the text output of the 'DBS-ETHERTRACE' command in VMS
35 * It was initially based on vms.c.
39 Example 'ETHERWATCH' output data (with "printable" characters in the
40 "printable characters" section of the output replaced by "." if they have
41 the 8th bit set, so as not to upset compilers that are expecting text
42 in comments to be in a particular character encoding that can't handle
45 42 names and addresses were loaded
46 Reading recorded data from PERSISTENCE
47 ------------------------------------------------------------------------------
48 From 00-D0-C0-D2-4D-60 [MF1] to AA-00-04-00-FC-94 [PSERVB]
49 Protocol 08-00 00 00-00-00-00-00, 60 byte buffer at 10-OCT-2001 10:20:45.16
50 [E..<8...........]- 0-[45 00 00 3C 38 93 00 00 1D 06 D2 12 80 93 11 1A]
51 [.........(......]- 16-[80 93 80 D6 02 D2 02 03 00 28 A4 90 00 00 00 00]
52 [................]- 32-[A0 02 FF FF 95 BD 00 00 02 04 05 B4 03 03 04 01]
53 [............ ]- 48-[01 01 08 0A 90 90 E5 14 00 00 00 00]
54 ------------------------------------------------------------------------------
55 From 00-D0-C0-D2-4D-60 [MF1] to AA-00-04-00-FC-94 [PSERVB]
56 Protocol 08-00 00 00-00-00-00-00, 50 byte buffer at 10-OCT-2001 10:20:45.17
57 [E..(8......%....]- 0-[45 00 00 28 38 94 00 00 1D 06 D2 25 80 93 11 1A]
58 [.........(..Z.4w]- 16-[80 93 80 D6 02 D2 02 03 00 28 A4 91 5A 1C 34 77]
59 [P.#(.s..........]- 32-[50 10 23 28 C1 73 00 00 02 04 05 B4 03 03 00 00]
63 Alternative HEX only output, slightly more efficient and all wireshark needs:
64 ------------------------------------------------------------------------------
65 From 00-D0-C0-D2-4D-60 [MF1] to AA-00-04-00-FC-94 [PSERVB]
66 Protocol 08-00 00 00-00-00-00-00, 50 byte buffer at 10-OCT-2001 10:20:45.17
67 0-[45 00 00 28 38 9B 00 00 1D 06 D2 1E 80 93 11 1A 80 93 80 D6]
68 20-[02 D2 02 03 00 28 A4 BF 5A 1C 34 79 50 10 23 28 C1 43 00 00]
69 40-[03 30 30 30 30 30 00 00 03 30]
72 /* Magic text to check for DBS-ETHERWATCH-ness of file */
73 static const char dbs_etherwatch_hdr_magic[] =
74 { 'E', 'T', 'H', 'E', 'R', 'W', 'A', 'T', 'C', 'H', ' ', ' '};
75 #define DBS_ETHERWATCH_HDR_MAGIC_SIZE \
76 (sizeof dbs_etherwatch_hdr_magic / sizeof dbs_etherwatch_hdr_magic[0])
78 /* Magic text for start of packet */
79 static const char dbs_etherwatch_rec_magic[] =
80 {'F', 'r', 'o', 'm', ' '};
81 #define DBS_ETHERWATCH_REC_MAGIC_SIZE \
82 (sizeof dbs_etherwatch_rec_magic / sizeof dbs_etherwatch_rec_magic[0])
85 * XXX - is this the biggest packet we can get?
87 #define DBS_ETHERWATCH_MAX_PACKET_LEN 16384
89 static gboolean dbs_etherwatch_read(wtap *wth, int *err, gchar **err_info,
91 static gboolean dbs_etherwatch_seek_read(wtap *wth, gint64 seek_off,
92 struct wtap_pkthdr *phdr, guint8 *pd, int len,
93 int *err, gchar **err_info);
94 static int parse_dbs_etherwatch_packet(wtap *wth, FILE_T fh, guint8* buf,
95 int *err, gchar **err_info);
96 static guint parse_single_hex_dump_line(char* rec, guint8 *buf,
98 static guint parse_hex_dump(char* dump, guint8 *buf, char seperator, char end);
100 /* Seeks to the beginning of the next packet, and returns the
101 byte offset. Returns -1 on failure, and sets "*err" to the error
102 and "*err_info" to null or an additional error string. */
103 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, err_info);
127 if (file_eof(wth->fh)) {
131 /* We got an error. */
132 *err = file_error(wth->fh, err_info);
137 #define DBS_ETHERWATCH_HEADER_LINES_TO_CHECK 200
138 #define DBS_ETHERWATCH_LINE_LENGTH 240
140 /* Look through the first part of a file to see if this is
141 * a DBS Ethertrace text trace file.
143 * Returns TRUE if it is, FALSE if it isn't or if we get an I/O error;
144 * if we get an I/O error, "*err" will be set to a non-zero value and
145 * "*err_info" will be set to null or an error string.
147 static gboolean dbs_etherwatch_check_file_type(wtap *wth, int *err,
150 char buf[DBS_ETHERWATCH_LINE_LENGTH];
153 unsigned int i, level;
155 buf[DBS_ETHERWATCH_LINE_LENGTH-1] = 0;
157 for (line = 0; line < DBS_ETHERWATCH_HEADER_LINES_TO_CHECK; line++) {
158 if (file_gets(buf, DBS_ETHERWATCH_LINE_LENGTH, wth->fh)!=NULL){
160 reclen = strlen(buf);
161 if (reclen < DBS_ETHERWATCH_HDR_MAGIC_SIZE)
165 for (i = 0; i < reclen; i++) {
167 if (byte == dbs_etherwatch_hdr_magic[level]) {
170 DBS_ETHERWATCH_HDR_MAGIC_SIZE) {
180 if (file_eof(wth->fh))
183 *err = file_error(wth->fh, err_info);
192 int dbs_etherwatch_open(wtap *wth, int *err, gchar **err_info)
194 /* Look for DBS ETHERWATCH header */
195 if (!dbs_etherwatch_check_file_type(wth, err, err_info)) {
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, err_info);
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->phdr.pseudo_header.eth.fcs_len = 0;
239 *data_offset = offset;
243 /* Used to read packets in random-access fashion */
245 dbs_etherwatch_seek_read (wtap *wth, gint64 seek_off,
246 struct wtap_pkthdr *phdr,
247 guint8 *pd, int len, int *err, gchar **err_info)
249 union wtap_pseudo_header *pseudo_header = &phdr->pseudo_header;
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_FILE;
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 const gchar months[] = "JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC";
331 int count, line_count;
334 memset(&tm, 0, sizeof(tm));
335 /* Our file pointer should be on the first line containing the
336 * summary information for a packet. Read in that line and
337 * extract the useful information
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 /* Get the destination address */
348 p = strstr(line, DEST_MAC_PREFIX);
350 *err = WTAP_ERR_BAD_FILE;
351 *err_info = g_strdup("dbs_etherwatch: destination address not found");
354 p += strlen(DEST_MAC_PREFIX);
355 if(parse_hex_dump(p, &buf[eth_hdr_len], HEX_HDR_SPR, HEX_HDR_END)
356 != MAC_ADDR_LENGTH) {
357 *err = WTAP_ERR_BAD_FILE;
358 *err_info = g_strdup("dbs_etherwatch: destination address not valid");
361 eth_hdr_len += MAC_ADDR_LENGTH;
363 /* Get the source address */
365 * Since the first part of the line is already skipped in order to find
366 * the start of the record we cannot index, just look for the first
370 while(!isxdigit((guchar)*p)) {
373 if(parse_hex_dump(p, &buf[eth_hdr_len], HEX_HDR_SPR,
374 HEX_HDR_END) != MAC_ADDR_LENGTH) {
375 *err = WTAP_ERR_BAD_FILE;
376 *err_info = g_strdup("dbs_etherwatch: source address not valid");
379 eth_hdr_len += MAC_ADDR_LENGTH;
381 /* Read the next line of the record header */
382 if (file_gets(line, DBS_ETHERWATCH_LINE_LENGTH, fh) == NULL) {
383 *err = file_error(fh, err_info);
385 *err = WTAP_ERR_SHORT_READ;
390 /* Check the lines is as least as long as the length position */
391 if(strlen(line) < LENGTH_POS) {
392 *err = WTAP_ERR_BAD_FILE;
393 *err_info = g_strdup("dbs_etherwatch: line too short");
397 num_items_scanned = sscanf(line + LENGTH_POS,
398 "%9d byte buffer at %2d-%3s-%4d %2d:%2d:%2d.%9d",
401 &tm.tm_year, &tm.tm_hour, &tm.tm_min,
404 if (num_items_scanned != 8) {
405 *err = WTAP_ERR_BAD_FILE;
406 *err_info = g_strdup("dbs_etherwatch: header line not valid");
410 /* Determine whether it is Ethernet II or IEEE 802 */
411 if(strncmp(&line[ETH_II_CHECK_POS], ETH_II_CHECK_STR,
412 strlen(ETH_II_CHECK_STR)) == 0) {
414 /* Get the Protocol */
415 if(parse_hex_dump(&line[PROTOCOL_POS], &buf[eth_hdr_len], HEX_HDR_SPR,
416 HEX_HDR_END) != PROTOCOL_LENGTH) {
417 *err = WTAP_ERR_BAD_FILE;
418 *err_info = g_strdup("dbs_etherwatch: Ethernet II protocol value not valid");
421 eth_hdr_len += PROTOCOL_LENGTH;
424 /* Remember where to put the length in the header */
425 length_pos = eth_hdr_len;
426 /* Leave room in the header for the length */
427 eth_hdr_len += IEEE802_LEN_LEN;
428 /* Remember how much of the header should not be added to the length */
429 length_from = eth_hdr_len;
430 /* Get the DSAP + SSAP */
431 if(parse_hex_dump(&line[SAP_POS], &buf[eth_hdr_len], HEX_HDR_SPR,
432 HEX_HDR_END) != SAP_LENGTH) {
433 *err = WTAP_ERR_BAD_FILE;
434 *err_info = g_strdup("dbs_etherwatch: 802.2 DSAP+SSAP value not valid");
437 eth_hdr_len += SAP_LENGTH;
438 /* Get the (first part of the) control field */
439 if(parse_hex_dump(&line[CTL_POS], &buf[eth_hdr_len], HEX_HDR_SPR,
440 HEX_HDR_END) != CTL_UNNUMB_LENGTH) {
441 *err = WTAP_ERR_BAD_FILE;
442 *err_info = g_strdup("dbs_etherwatch: 802.2 control field first part not valid");
445 /* Determine whether the control is numbered, and thus longer */
446 if((buf[eth_hdr_len] & CTL_UNNUMB_MASK) != CTL_UNNUMB_VALUE) {
447 /* Get the rest of the control field, the first octet in the PID */
448 if(parse_hex_dump(&line[PID_POS],
449 &buf[eth_hdr_len + CTL_UNNUMB_LENGTH], HEX_HDR_END,
450 HEX_HDR_SPR) != CTL_NUMB_LENGTH - CTL_UNNUMB_LENGTH) {
451 *err = WTAP_ERR_BAD_FILE;
452 *err_info = g_strdup("dbs_etherwatch: 802.2 control field second part value not valid");
455 eth_hdr_len += CTL_NUMB_LENGTH;
457 eth_hdr_len += CTL_UNNUMB_LENGTH;
459 /* Determine whether it is SNAP */
460 if(strncmp(&line[SNAP_CHECK_POS], SNAP_CHECK_STR,
461 strlen(SNAP_CHECK_STR)) == 0) {
463 if(parse_hex_dump(&line[PID_POS], &buf[eth_hdr_len], HEX_HDR_SPR,
464 HEX_PID_END) != PID_LENGTH) {
465 *err = WTAP_ERR_BAD_FILE;
466 *err_info = g_strdup("dbs_etherwatch: 802.2 PID value not valid");
469 eth_hdr_len += PID_LENGTH;
471 /* Write the length in the header */
472 length = eth_hdr_len - length_from + pkt_len;
473 buf[length_pos] = (length) >> 8;
474 buf[length_pos+1] = (length) & 0xFF;
478 wth->phdr.presence_flags = WTAP_HAS_TS|WTAP_HAS_CAP_LEN;
480 p = strstr(months, mon);
482 tm.tm_mon = (int)(p - months) / 3;
486 wth->phdr.ts.secs = mktime(&tm);
487 wth->phdr.ts.nsecs = csec * 10000000;
488 wth->phdr.caplen = eth_hdr_len + pkt_len;
489 wth->phdr.len = eth_hdr_len + pkt_len;
492 /* Parse the hex dump */
494 while (count < pkt_len) {
495 if (file_gets(line, DBS_ETHERWATCH_LINE_LENGTH, fh) == NULL) {
496 *err = file_error(fh, err_info);
498 *err = WTAP_ERR_SHORT_READ;
502 if (!(line_count = parse_single_hex_dump_line(line,
503 &buf[eth_hdr_len + count], count))) {
504 *err = WTAP_ERR_BAD_FILE;
505 *err_info = g_strdup("dbs_etherwatch: packet data value not valid");
509 if (count > pkt_len) {
510 *err = WTAP_ERR_BAD_FILE;
511 *err_info = g_strdup("dbs_etherwatch: packet data value has too many bytes");
515 return eth_hdr_len + pkt_len;
518 /* Parse a hex dump line */
520 /DISPLAY=BOTH output:
523 0123456789012345678901234567890123456789012345
524 [E..(8...........]- 0-[45 00 00 28 38 9B 00 00 1D 06 D2 1E 80 93 11 1A]
525 [.........(..Z.4y]- 16-[80 93 80 D6 02 D2 02 03 00 28 A4 BF 5A 1C 34 79]
526 [P.#(.C...00000..]- 32-[50 10 23 28 C1 43 00 00 03 30 30 30 30 30 00 00]
529 /DISPLAY=HEXADECIMAL output:
532 0123456789012345678901234567890123456789012345
533 0-[45 00 00 28 38 9B 00 00 1D 06 D2 1E 80 93 11 1A 80 93 80 D6]
534 20-[02 D2 02 03 00 28 A4 BF 5A 1C 34 79 50 10 23 28 C1 43 00 00]
535 40-[03 30 30 30 30 30 00 00 03 30]
539 #define TYPE_CHECK_POS 2 /* Position to check the type of hex dump */
540 #define TYPE_CHECK_BOTH '[' /* Value at pos. that indicates BOTH type */
541 #define COUNT_POS_BOTH 21 /* Count position BOTH type */
542 #define COUNT_POS_HEX 1 /* Count position HEX type */
543 #define COUNT_SIZE 5 /* Length counter */
544 #define HEX_DUMP_START '[' /* Start char */
545 #define HEX_DUMP_SPR ' ' /* Seperator char */
546 #define HEX_DUMP_END ']' /* End char */
548 /* Take a string representing one line from a hex dump and converts the
549 * text to binary data. We check the printed offset with the offset
550 * we are passed to validate the record. We place the bytes in the buffer
551 * at the specified offset.
553 * Returns length parsed if a good hex dump, 0 if bad.
556 parse_single_hex_dump_line(char* rec, guint8 *buf, int byte_offset) {
562 /* Check that the record is as least as long as the check offset */
563 for(i = 0; i < TYPE_CHECK_POS; i++)
569 /* determine the format and thus the counter offset and hex dump length */
570 if(rec[TYPE_CHECK_POS] == TYPE_CHECK_BOTH)
572 pos = COUNT_POS_BOTH;
579 /* Check that the record is as least as long as the start position */
588 /* Get the byte_offset directly from the record */
590 for(i = 0; i < COUNT_SIZE; i++) {
591 if(!isspace((guchar)rec[pos])) {
592 if(isdigit((guchar)rec[pos])) {
594 value += rec[pos] - '0';
602 if (value != byte_offset) {
606 /* find the start of the hex dump */
607 while(rec[pos] != HEX_DUMP_START) {
608 if(rec[pos] == '\0') {
614 return parse_hex_dump(&rec[pos], buf, HEX_DUMP_SPR, HEX_DUMP_END);
617 /* Parse a hex dump */
619 parse_hex_dump(char* dump, guint8 *buf, char seperator, char end) {
622 /* Parse the hex dump */
625 while(dump[pos] != end) {
626 /* Check the hex value */
627 if(!(isxdigit((guchar)dump[pos]) &&
628 isxdigit((guchar)dump[pos + 1]))) {
631 /* Get the hex value value */
632 if(isdigit((guchar)dump[pos])) {
633 buf[count] = (dump[pos] - '0') << 4;
635 buf[count] = (toupper(dump[pos]) - 'A' + 10) << 4;
638 if(isdigit((guchar)dump[pos])) {
639 buf[count] += dump[pos] - '0';
641 buf[count] += toupper(dump[pos]) - 'A' + 10;
645 /* Skip the seperator characters */
646 while(dump[pos] == seperator) {