3 * $Id: vms.c,v 1.4 2002/01/15 20:18:02 guy Exp $
6 * Copyright (c) 2001 by Marc Milgram <mmilgram@arrayinc.com>
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.
29 #include "file_wrappers.h"
36 /* This module reads the output of the 'TCPIPTRACE' command in VMS
37 * It was initially based on toshiba.c.
41 Example 'TCPIPTRACE' output data:
42 TCPIPtrace full display RCV packet 8 at 10-JUL-2001 14:54:19.56
44 IP Version = 4, IHL = 5, TOS = 00, Total Length = 84 = ^x0054
45 IP Identifier = ^x178F, Flags (0=0,DF=0,MF=0),
46 Fragment Offset = 0 = ^x0000, Calculated Offset = 0 = ^x0000
47 IP TTL = 64 = ^x40, Protocol = 17 = ^x11, Header Checksum = ^x4C71
48 IP Source Address = 10.12.1.80
49 IP Destination Address = 10.12.1.50
51 UDP Source Port = 731, UDP Destination Port = 111
52 UDP Header and Datagram Length = 64 = ^x0040, Checksum = ^xB6C0
54 50010C0A 714C1140 00008F17 54000045 0000 E..T....@.Lq...P
55 27E54C3C | C0B64000 6F00DB02 | 32010C0A 0010 ...2...o.@..<L.'
56 02000000 A0860100 02000000 00000000 0020 ................
57 00000000 00000000 00000000 03000000 0030 ................
58 06000000 01000000 A5860100 00000000 0040 ................
61 --------------------------------------------------------------------------------
65 /* Magic text to check for VMS-ness of file */
66 static const char vms_hdr_magic[] =
67 { 'T', 'C', 'P', 'I', 'P', 't', 'r', 'a', 'c', 'e', ' '};
68 #define VMS_HDR_MAGIC_SIZE (sizeof vms_hdr_magic / sizeof vms_hdr_magic[0])
70 /* Magic text for start of packet */
71 #define vms_rec_magic vms_hdr_magic
72 #define VMS_REC_MAGIC_SIZE (sizeof vms_rec_magic / sizeof vms_rec_magic[0])
74 static gboolean vms_read(wtap *wth, int *err, long *data_offset);
75 static int vms_seek_read(wtap *wth, long seek_off,
76 union wtap_pseudo_header *pseudo_header, guint8 *pd, int len);
77 static gboolean parse_single_hex_dump_line(char* rec, guint8 *buf, long byte_offset, int remaining_bytes);
78 static int parse_vms_hex_dump(FILE_T fh, int pkt_len, guint8* buf, int *err);
79 static int parse_vms_rec_hdr(wtap *wth, FILE_T fh, int *err);
82 /* Seeks to the beginning of the next packet, and returns the
83 byte offset. Returns -1 on failure. */
84 /* XXX - Handle I/O errors. */
85 static long vms_seek_next_packet(wtap *wth)
88 unsigned int level = 0;
90 while ((byte = file_getc(wth->fh)) != EOF) {
91 if (byte == vms_rec_magic[level]) {
93 if (level >= VMS_REC_MAGIC_SIZE) {
94 /* note: we're leaving file pointer right after the magic characters */
95 return file_tell(wth->fh) + 1;
104 #define VMS_HEADER_LINES_TO_CHECK 200
105 #define VMS_LINE_LENGTH 240
107 /* Look through the first part of a file to see if this is
110 * Returns TRUE if it is, FALSE if it isn't.
112 * Leaves file handle at begining of line that contains the VMS Magic
115 static gboolean vms_check_file_type(wtap *wth)
117 char buf[VMS_LINE_LENGTH];
119 unsigned int reclen, i, level;
122 buf[VMS_LINE_LENGTH-1] = 0;
124 for (line = 0; line < VMS_HEADER_LINES_TO_CHECK; line++) {
125 mpos = file_tell(wth->fh);
126 if (file_gets(buf, VMS_LINE_LENGTH, wth->fh) != NULL) {
128 reclen = strlen(buf);
129 if (reclen < VMS_HDR_MAGIC_SIZE)
133 for (i = 0; i < reclen; i++) {
135 if (byte == vms_hdr_magic[level]) {
137 if (level >= VMS_HDR_MAGIC_SIZE) {
138 file_seek(wth->fh, mpos, SEEK_SET);
153 /* XXX - return -1 on I/O error and actually do something with 'err'. */
154 int vms_open(wtap *wth, int *err)
156 /* Look for VMS header */
157 if (!vms_check_file_type(wth)) {
161 wth->data_offset = 0;
162 wth->file_encap = WTAP_ENCAP_RAW_IP;
163 wth->file_type = WTAP_FILE_VMS;
164 wth->snapshot_length = 16384; /* just guessing */
165 wth->subtype_read = vms_read;
166 wth->subtype_seek_read = vms_seek_read;
171 /* Find the next packet and parse it; called from wtap_loop(). */
172 static gboolean vms_read(wtap *wth, int *err, long *data_offset)
178 /* Find the next packet */
179 offset = vms_seek_next_packet(wth);
181 *err = 0; /* XXX - assume, for now, that it's an EOF */
185 /* Parse the header */
186 pkt_len = parse_vms_rec_hdr(wth, wth->fh, err);
188 /* Make sure we have enough room for the packet */
189 buffer_assure_space(wth->frame_buffer, wth->snapshot_length);
190 buf = buffer_start_ptr(wth->frame_buffer);
192 /* Convert the ASCII hex dump to binary data */
193 parse_vms_hex_dump(wth->fh, pkt_len, buf, err);
195 wth->data_offset = offset;
196 *data_offset = offset;
200 /* Used to read packets in random-access fashion */
202 vms_seek_read (wtap *wth, long seek_off, union wtap_pseudo_header *pseudo_header,
208 file_seek(wth->random_fh, seek_off - 1, SEEK_SET);
210 pkt_len = parse_vms_rec_hdr(NULL, wth->random_fh, &err);
212 if (pkt_len != len) {
216 parse_vms_hex_dump(wth->random_fh, pkt_len, pd, &err);
221 /* isdumpline assumes that dump lines start with some spaces followed by a
225 isdumpline( guchar *line )
229 while (i<VMS_LINE_LENGTH && !isalnum(line[i]))
232 if (! isxdigit(line[i]))
235 while (i<VMS_LINE_LENGTH && isxdigit(line[i]))
238 return isspace(line[i]);
241 /* Parses a packet record header. */
243 parse_vms_rec_hdr(wtap *wth, FILE_T fh, int *err)
245 char line[VMS_LINE_LENGTH];
246 int num_items_scanned;
247 int pkt_len, pktnum, csec;
251 static guchar months[] = "JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC";
255 /* Our file pointer should be on the first line containing the
256 * summary information for a packet. Read in that line and
257 * extract the useful information
259 if (file_gets(line, VMS_LINE_LENGTH, fh) == NULL) {
260 *err = file_error(fh);
262 *err = WTAP_ERR_SHORT_READ;
267 p = strstr(line, "packet ");
269 *err = WTAP_ERR_BAD_RECORD;
273 /* Find text in line starting with "packet ". */
274 num_items_scanned = sscanf(p,
275 "packet %d at %d-%3s-%d %d:%d:%d.%d",
276 &pktnum, &time.tm_mday, mon,
277 &time.tm_year, &time.tm_hour, &time.tm_min,
278 &time.tm_sec, &csec);
280 if (num_items_scanned != 8) {
281 *err = WTAP_ERR_BAD_RECORD;
285 /* Skip lines until one starts with a hex number */
287 if (file_gets(line, VMS_LINE_LENGTH, fh) == NULL) {
288 *err = file_error(fh);
290 *err = WTAP_ERR_SHORT_READ;
294 if ( (! pkt_len) && (p = strstr(line, "Length"))) {
295 p += sizeof("Length ");
296 while (*p && ! isdigit(*p))
300 *err = WTAP_ERR_BAD_RECORD;
307 } while (! isdumpline(line));
310 p = strstr(months, mon);
312 time.tm_mon = (p - months) / 3;
313 time.tm_year -= 1900;
315 wth->phdr.ts.tv_sec = mktime(&time);
317 wth->phdr.ts.tv_usec = csec * 10000;
318 wth->phdr.caplen = pkt_len;
319 wth->phdr.len = pkt_len;
320 wth->phdr.pkt_encap = WTAP_ENCAP_RAW_IP;
326 /* Converts ASCII hex dump to binary data */
328 parse_vms_hex_dump(FILE_T fh, int pkt_len, guint8* buf, int *err)
330 guchar line[VMS_LINE_LENGTH];
334 /* Calculate the number of hex dump lines, each
335 * containing 16 bytes of data */
336 hex_lines = pkt_len / 16 + ((pkt_len % 16) ? 1 : 0);
338 for (i = 0; i < hex_lines; i++) {
339 if (file_gets(line, VMS_LINE_LENGTH, fh) == NULL) {
340 *err = file_error(fh);
342 *err = WTAP_ERR_SHORT_READ;
347 while (! isdumpline(line)) /* advance to start of hex data */
348 if (file_gets(line, VMS_LINE_LENGTH, fh) == NULL) {
349 *err = file_error(fh);
351 *err = WTAP_ERR_SHORT_READ;
355 while (line[offset] && !isxdigit(line[offset]))
358 if (!parse_single_hex_dump_line(line, buf, i * 16,
360 *err = WTAP_ERR_BAD_RECORD;
369 0123456789012345678901234567890123456789012345
370 50010C0A A34C0640 00009017 2C000045 0000 E..,....@.L....P
371 00000000 14945E52 0A00DC02 | 32010C0A 0010 ...2....R^......
372 0000 | B4050402 00003496 00020260 0020 `....4........
376 #define HEX_LENGTH ((8 * 4) + 7) /* eight clumps of 4 bytes with 7 inner spaces */
377 /* Take a string representing one line from a hex dump and converts the
378 * text to binary data. We check the printed offset with the offset
379 * we are passed to validate the record. We place the bytes in the buffer
380 * at the specified offset.
382 * In the process, we're going to write all over the string.
384 * Returns TRUE if good hex dump, FALSE if bad.
387 parse_single_hex_dump_line(char* rec, guint8 *buf, long byte_offset,
393 static int offsets[16] = {39,37,35,33,28,26,24,22,17,15,13,11,6,4,2,0};
394 char lbuf[3] = {0,0,0};
397 /* Get the byte_offset directly from the record */
399 value = strtoul(s + 45 + in_off, NULL, 16);
401 if (value != byte_offset) {
405 /* Read the octets right to left, as that is how they are displayed
409 for (i = 0; i < 16; i++) {
410 lbuf[0] = rec[offsets[i] + in_off];
411 lbuf[1] = rec[offsets[i] + 1 + in_off];
413 buf[byte_offset + i] = (guint8) strtoul(lbuf, NULL, 16);