3 * $Id: vms.c,v 1.6 2002/02/08 10:07:41 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 in_off, 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 ((level == 3) && (byte != vms_rec_magic[level]))
92 level += 2; /* Accept TCPtrace as well as TCPIPtrace */
93 if (byte == vms_rec_magic[level]) {
95 if (level >= VMS_REC_MAGIC_SIZE) {
96 /* note: we're leaving file pointer right after the magic characters */
97 return file_tell(wth->fh) + 1;
106 #define VMS_HEADER_LINES_TO_CHECK 200
107 #define VMS_LINE_LENGTH 240
109 /* Look through the first part of a file to see if this is
112 * Returns TRUE if it is, FALSE if it isn't.
114 * Leaves file handle at begining of line that contains the VMS Magic
117 static gboolean vms_check_file_type(wtap *wth)
119 char buf[VMS_LINE_LENGTH];
121 unsigned int reclen, i, level;
124 buf[VMS_LINE_LENGTH-1] = 0;
126 for (line = 0; line < VMS_HEADER_LINES_TO_CHECK; line++) {
127 mpos = file_tell(wth->fh);
128 if (file_gets(buf, VMS_LINE_LENGTH, wth->fh) != NULL) {
130 reclen = strlen(buf);
131 if (reclen < VMS_HDR_MAGIC_SIZE)
135 for (i = 0; i < reclen; i++) {
137 if ((level == 3) && (byte != vms_hdr_magic[level]))
138 level += 2; /* Accept TCPIPtrace as well as TCPtrace */
139 if (byte == vms_hdr_magic[level]) {
141 if (level >= VMS_HDR_MAGIC_SIZE) {
142 file_seek(wth->fh, mpos, SEEK_SET);
157 /* XXX - return -1 on I/O error and actually do something with 'err'. */
158 int vms_open(wtap *wth, int *err)
160 /* Look for VMS header */
161 if (!vms_check_file_type(wth)) {
165 wth->data_offset = 0;
166 wth->file_encap = WTAP_ENCAP_RAW_IP;
167 wth->file_type = WTAP_FILE_VMS;
168 wth->snapshot_length = 0; /* not known */
169 wth->subtype_read = vms_read;
170 wth->subtype_seek_read = vms_seek_read;
175 /* Find the next packet and parse it; called from wtap_loop(). */
176 static gboolean vms_read(wtap *wth, int *err, long *data_offset)
182 /* Find the next packet */
183 offset = vms_seek_next_packet(wth);
185 *err = 0; /* XXX - assume, for now, that it's an EOF */
189 /* Parse the header */
190 pkt_len = parse_vms_rec_hdr(wth, wth->fh, err);
195 /* Make sure we have enough room for the packet */
196 buffer_assure_space(wth->frame_buffer, pkt_len);
197 buf = buffer_start_ptr(wth->frame_buffer);
199 /* Convert the ASCII hex dump to binary data */
200 parse_vms_hex_dump(wth->fh, pkt_len, buf, err);
202 wth->data_offset = offset;
203 *data_offset = offset;
207 /* Used to read packets in random-access fashion */
209 vms_seek_read (wtap *wth, long seek_off, union wtap_pseudo_header *pseudo_header,
215 file_seek(wth->random_fh, seek_off - 1, SEEK_SET);
217 pkt_len = parse_vms_rec_hdr(NULL, wth->random_fh, &err);
219 if (pkt_len != len) {
223 parse_vms_hex_dump(wth->random_fh, pkt_len, pd, &err);
228 /* isdumpline assumes that dump lines start with some spaces followed by a
232 isdumpline( guchar *line )
236 while (i<VMS_LINE_LENGTH && !isalnum(line[i]))
239 if (! isxdigit(line[i]))
242 while (i<VMS_LINE_LENGTH && isxdigit(line[i]))
245 return isspace(line[i]);
248 /* Parses a packet record header. */
250 parse_vms_rec_hdr(wtap *wth, FILE_T fh, int *err)
252 char line[VMS_LINE_LENGTH];
253 int num_items_scanned;
258 char mon[4] = {'J', 'A', 'N', 0};
260 static guchar months[] = "JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC";
268 /* Skip lines until one starts with a hex number */
270 if (file_gets(line, VMS_LINE_LENGTH, fh) == NULL) {
271 *err = file_error(fh);
272 if ((*err == 0) && (csec != 101)) {
273 *err = WTAP_ERR_SHORT_READ;
277 if ((csec == 101) && (p = strstr(line, "packet "))
278 && (! strstr(line, "could not save "))) {
279 /* Find text in line starting with "packet ". */
280 num_items_scanned = sscanf(p,
281 "packet %d at %d-%3s-%d %d:%d:%d.%d",
282 &pktnum, &time.tm_mday, mon,
283 &time.tm_year, &time.tm_hour,
284 &time.tm_min, &time.tm_sec, &csec);
286 if (num_items_scanned != 8) {
287 *err = WTAP_ERR_BAD_RECORD;
291 if ( (! pkt_len) && (p = strstr(line, "Length"))) {
292 p += sizeof("Length ");
293 while (*p && ! isdigit(*p))
297 *err = WTAP_ERR_BAD_RECORD;
304 } while (! isdumpline(line));
307 p = strstr(months, mon);
309 time.tm_mon = (p - months) / 3;
310 time.tm_year -= 1900;
312 wth->phdr.ts.tv_sec = mktime(&time);
314 wth->phdr.ts.tv_usec = csec * 10000;
315 wth->phdr.caplen = pkt_len;
316 wth->phdr.len = pkt_len;
317 wth->phdr.pkt_encap = WTAP_ENCAP_RAW_IP;
323 /* Converts ASCII hex dump to binary data */
325 parse_vms_hex_dump(FILE_T fh, int pkt_len, guint8* buf, int *err)
327 guchar line[VMS_LINE_LENGTH];
331 for (i = 0; i < pkt_len; i += 16) {
332 if (file_gets(line, VMS_LINE_LENGTH, fh) == NULL) {
333 *err = file_error(fh);
335 *err = WTAP_ERR_SHORT_READ;
340 while (! isdumpline(line)) /* advance to start of hex data */
341 if (file_gets(line, VMS_LINE_LENGTH, fh) == NULL) {
342 *err = file_error(fh);
344 *err = WTAP_ERR_SHORT_READ;
348 while (line[offset] && !isxdigit(line[offset]))
351 if (!parse_single_hex_dump_line(line, buf, i,
352 offset, pkt_len - i)) {
353 *err = WTAP_ERR_BAD_RECORD;
357 /* Avoid TCPIPTRACE-W-BUFFERSFUL, TCPIPtrace could not save n packets.
359 file_gets(line, VMS_LINE_LENGTH, fh);
365 0123456789012345678901234567890123456789012345
366 50010C0A A34C0640 00009017 2C000045 0000 E..,....@.L....P
367 00000000 14945E52 0A00DC02 | 32010C0A 0010 ...2....R^......
368 0000 | B4050402 00003496 00020260 0020 `....4........
372 #define HEX_LENGTH ((8 * 4) + 7) /* eight clumps of 4 bytes with 7 inner spaces */
373 /* Take a string representing one line from a hex dump and converts the
374 * text to binary data. We check the printed offset with the offset
375 * we are passed to validate the record. We place the bytes in the buffer
376 * at the specified offset.
378 * Returns TRUE if good hex dump, FALSE if bad.
381 parse_single_hex_dump_line(char* rec, guint8 *buf, long byte_offset,
382 int in_off, int remaining) {
387 static int offsets[16] = {39,37,35,33,28,26,24,22,17,15,13,11,6,4,2,0};
388 char lbuf[3] = {0,0,0};
391 /* Get the byte_offset directly from the record */
393 value = strtoul(s + 45 + in_off, NULL, 16);
395 if (value != byte_offset) {
402 /* Read the octets right to left, as that is how they are displayed
406 for (i = 0; i < remaining; i++) {
407 lbuf[0] = rec[offsets[i] + in_off];
408 lbuf[1] = rec[offsets[i] + 1 + in_off];
410 buf[byte_offset + i] = (guint8) strtoul(lbuf, NULL, 16);