--- /dev/null
+/* vms.c
+ *
+ * $Id: vms.c,v 1.1 2001/10/18 20:29:56 guy Exp $
+ *
+ * Wiretap Library
+ * Copyright (c) 2001 by Marc Milgram <mmilgram@arrayinc.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+#include "wtap-int.h"
+#include "buffer.h"
+#include "vms.h"
+#include "file_wrappers.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+/* This module reads the output of the 'TCPIPTRACE' command in VMS
+ * It was initially based on toshiba.c.
+ */
+
+/*
+ Example 'TCPIPTRACE' output data:
+ TCPIPtrace full display RCV packet 8 at 10-JUL-2001 14:54:19.56
+
+ IP Version = 4, IHL = 5, TOS = 00, Total Length = 84 = ^x0054
+ IP Identifier = ^x178F, Flags (0=0,DF=0,MF=0),
+ Fragment Offset = 0 = ^x0000, Calculated Offset = 0 = ^x0000
+ IP TTL = 64 = ^x40, Protocol = 17 = ^x11, Header Checksum = ^x4C71
+ IP Source Address = 10.12.1.80
+ IP Destination Address = 10.12.1.50
+
+ UDP Source Port = 731, UDP Destination Port = 111
+ UDP Header and Datagram Length = 64 = ^x0040, Checksum = ^xB6C0
+
+ 50010C0A 714C1140 00008F17 54000045 0000 E..T....@.Lq...P
+ 27E54C3C | C0B64000 6F00DB02 | 32010C0A 0010 ...2...o.@..<L.'
+ 02000000 A0860100 02000000 00000000 0020 ................
+ 00000000 00000000 00000000 03000000 0030 ................
+ 06000000 01000000 A5860100 00000000 0040 ................
+ 00000000 0050 ....
+
+--------------------------------------------------------------------------------
+
+ */
+
+/* Magic text to check for VMS-ness of file */
+static const char vms_hdr_magic[] =
+{ ' ', ' ', ' ', 'T', 'C', 'P', 'I', 'P', 't', 'r', 'a', 'c', 'e', ' '};
+#define VMS_HDR_MAGIC_SIZE (sizeof vms_hdr_magic / sizeof vms_hdr_magic[0])
+
+/* Magic text for start of packet */
+#define vms_rec_magic vms_hdr_magic
+#define VMS_REC_MAGIC_SIZE (sizeof vms_rec_magic / sizeof vms_rec_magic[0])
+
+static gboolean vms_read(wtap *wth, int *err, long *data_offset);
+static int vms_seek_read(wtap *wth, long seek_off,
+ union wtap_pseudo_header *pseudo_header, guint8 *pd, int len);
+static gboolean parse_single_hex_dump_line(char* rec, guint8 *buf, long byte_offset, int remaining_bytes);
+static int parse_vms_hex_dump(FILE_T fh, int pkt_len, guint8* buf, int *err);
+static int parse_vms_rec_hdr(wtap *wth, FILE_T fh, int *err);
+
+
+/* Seeks to the beginning of the next packet, and returns the
+ byte offset. Returns -1 on failure. */
+/* XXX - Handle I/O errors. */
+static long vms_seek_next_packet(wtap *wth)
+{
+ int byte;
+ unsigned int level = 0;
+
+ while ((byte = file_getc(wth->fh)) != EOF) {
+ if (byte == vms_rec_magic[level]) {
+ level++;
+ if (level >= VMS_REC_MAGIC_SIZE) {
+ /* note: we're leaving file pointer right after the magic characters */
+ return file_tell(wth->fh) + 1;
+ }
+ } else {
+ level = 0;
+ }
+ }
+ return -1;
+}
+
+#define VMS_HEADER_LINES_TO_CHECK 200
+#define VMS_LINE_LENGTH 240
+
+/* Look through the first part of a file to see if this is
+ * a VMS trace file.
+ *
+ * Returns TRUE if it is, FALSE if it isn't.
+ *
+ * Leaves file handle at begining of line that contains the VMS Magic
+ * identifier.
+ */
+static gboolean vms_check_file_type(wtap *wth)
+{
+ char buf[VMS_LINE_LENGTH];
+ int line, byte;
+ unsigned int reclen, i, level;
+ long mpos;
+
+ buf[VMS_LINE_LENGTH-1] = 0;
+
+ for (line = 0; line < VMS_HEADER_LINES_TO_CHECK; line++) {
+ mpos = file_tell(wth->fh);
+ if (file_gets(buf, VMS_LINE_LENGTH, wth->fh) != NULL) {
+
+ reclen = strlen(buf);
+ if (reclen < VMS_HDR_MAGIC_SIZE)
+ continue;
+
+ level = 0;
+ for (i = 0; i < reclen; i++) {
+ byte = buf[i];
+ if (byte == vms_hdr_magic[level]) {
+ level++;
+ if (level >= VMS_HDR_MAGIC_SIZE) {
+ file_seek(wth->fh, mpos, SEEK_SET);
+ return TRUE;
+ }
+ }
+ else
+ level = 0;
+ }
+ }
+ else
+ return FALSE;
+ }
+ return FALSE;
+}
+
+
+/* XXX - return -1 on I/O error and actually do something with 'err'. */
+int vms_open(wtap *wth, int *err)
+{
+ /* Look for VMS header */
+ if (!vms_check_file_type(wth)) {
+ return 0;
+ }
+
+ wth->data_offset = 0;
+ wth->file_encap = WTAP_ENCAP_PER_PACKET;
+ wth->file_type = WTAP_FILE_VMS;
+ wth->snapshot_length = 16384; /* just guessing */
+ wth->subtype_read = vms_read;
+ wth->subtype_seek_read = vms_seek_read;
+
+ return 1;
+}
+
+/* Find the next packet and parse it; called from wtap_loop(). */
+static gboolean vms_read(wtap *wth, int *err, long *data_offset)
+{
+ long offset = 0;
+ guint8 *buf;
+ int pkt_len;
+
+ /* Find the next packet */
+ offset = vms_seek_next_packet(wth);
+ if (offset < 1) {
+ *err = 0; /* XXX - assume, for now, that it's an EOF */
+ return FALSE;
+ }
+
+ /* Parse the header */
+ pkt_len = parse_vms_rec_hdr(wth, wth->fh, err);
+
+ /* Make sure we have enough room for the packet */
+ buffer_assure_space(wth->frame_buffer, wth->snapshot_length);
+ buf = buffer_start_ptr(wth->frame_buffer);
+
+ /* Convert the ASCII hex dump to binary data */
+ parse_vms_hex_dump(wth->fh, pkt_len, buf, err);
+
+ wth->data_offset = offset;
+ *data_offset = offset;
+ return TRUE;
+}
+
+/* Used to read packets in random-access fashion */
+static int
+vms_seek_read (wtap *wth, long seek_off, union wtap_pseudo_header *pseudo_header,
+ guint8 *pd, int len)
+{
+ int pkt_len;
+ int err;
+
+ file_seek(wth->random_fh, seek_off - 1, SEEK_SET);
+
+ pkt_len = parse_vms_rec_hdr(NULL, wth->random_fh, &err);
+
+ if (pkt_len != len) {
+ return -1;
+ }
+
+ parse_vms_hex_dump(wth->random_fh, pkt_len, pd, &err);
+
+ return 0;
+}
+
+/* isdumpline assumes that dump lines start with some spaces followed by a
+ * hex number.
+ */
+static int
+isdumpline( guchar *line )
+{
+ int i = 0;
+
+ while (i<VMS_LINE_LENGTH && !isalnum(line[i]))
+ i++;
+
+ if (! isxdigit(line[i]))
+ return 0;
+
+ while (i<VMS_LINE_LENGTH && isxdigit(line[i]))
+ i++;
+
+ return isspace(line[i]);
+}
+
+/* Parses a packet record header. */
+static int
+parse_vms_rec_hdr(wtap *wth, FILE_T fh, int *err)
+{
+ char line[VMS_LINE_LENGTH];
+ int num_items_scanned;
+ int pkt_len, pktnum, csec;
+ struct tm time;
+ char mon[4];
+ guchar *p;
+ long mpos;
+ static guchar months[] = "JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC";
+
+ pkt_len = 0;
+
+ /* Our file pointer should be on the first line containing the
+ * summary information for a packet. Read in that line and
+ * extract the useful information
+ */
+ if (file_gets(line, VMS_LINE_LENGTH, fh) == NULL) {
+ *err = file_error(fh);
+ if (*err == 0) {
+ *err = WTAP_ERR_SHORT_READ;
+ }
+ return -1;
+ }
+
+ p = strstr(line, "packet ");
+ if ( !p ) {
+ *err = WTAP_ERR_BAD_RECORD;
+ return 01;
+ }
+
+ /* Find text in line starting with "packet ". */
+ num_items_scanned = sscanf(p,
+ "packet %d at %d-%3s-%d %d:%d:%d.%d",
+ &pktnum, &time.tm_mday, mon,
+ &time.tm_year, &time.tm_hour, &time.tm_min,
+ &time.tm_sec, &csec);
+
+ if (num_items_scanned != 8) {
+ *err = WTAP_ERR_BAD_RECORD;
+ return -1;
+ }
+
+ /* Skip lines until one starts with a hex number */
+ do {
+ mpos = file_tell(fh);
+ if (file_gets(line, VMS_LINE_LENGTH, fh) == NULL) {
+ *err = file_error(fh);
+ if (*err == 0) {
+ *err = WTAP_ERR_SHORT_READ;
+ }
+ return -1;
+ }
+ if ( (! pkt_len) && (p = strstr(line, "Length"))) {
+ p += sizeof("Length ");
+ while (*p && ! isdigit(*p))
+ p++;
+
+ if ( !*p ) {
+ *err = WTAP_ERR_BAD_RECORD;
+ return -1;
+ }
+
+ pkt_len = atoi(p);
+ }
+ } while (! isdumpline(line));
+
+ file_seek(fh, mpos, SEEK_SET);
+
+ if (wth) {
+ p = strstr(months, mon);
+ if (p)
+ time.tm_mon = (p - months) / 3;
+ time.tm_year -= 1900;
+
+ wth->phdr.ts.tv_sec = mktime(&time);
+
+ wth->phdr.ts.tv_usec = csec * 10000;
+ wth->phdr.caplen = pkt_len;
+ wth->phdr.len = pkt_len;
+ wth->phdr.pkt_encap = WTAP_ENCAP_RAW_IP;
+ }
+
+ return pkt_len;
+}
+
+/* Converts ASCII hex dump to binary data */
+static int
+parse_vms_hex_dump(FILE_T fh, int pkt_len, guint8* buf, int *err)
+{
+ guchar line[VMS_LINE_LENGTH];
+ int i, hex_lines;
+ int offset = 0;
+
+ /* Calculate the number of hex dump lines, each
+ * containing 16 bytes of data */
+ hex_lines = pkt_len / 16 + ((pkt_len % 16) ? 1 : 0);
+
+ for (i = 0; i < hex_lines; i++) {
+ if (file_gets(line, VMS_LINE_LENGTH, fh) == NULL) {
+ *err = file_error(fh);
+ if (*err == 0) {
+ *err = WTAP_ERR_SHORT_READ;
+ }
+ return -1;
+ }
+ if (i == 0)
+ while (line[offset] && !isxdigit(line[offset]))
+ offset++;
+
+ if (!parse_single_hex_dump_line(line, buf, i * 16,
+ offset)) {
+ *err = WTAP_ERR_BAD_RECORD;
+ return -1;
+ }
+ }
+ return 0;
+}
+
+/*
+ 1 2 3 4
+0123456789012345678901234567890123456789012345
+ 50010C0A A34C0640 00009017 2C000045 0000 E..,....@.L....P
+ 00000000 14945E52 0A00DC02 | 32010C0A 0010 ...2....R^......
+ 0000 | B4050402 00003496 00020260 0020 `....4........
+*/
+
+#define START_POS 7
+#define HEX_LENGTH ((8 * 4) + 7) /* eight clumps of 4 bytes with 7 inner spaces */
+/* Take a string representing one line from a hex dump and converts the
+ * text to binary data. We check the printed offset with the offset
+ * we are passed to validate the record. We place the bytes in the buffer
+ * at the specified offset.
+ *
+ * In the process, we're going to write all over the string.
+ *
+ * Returns TRUE if good hex dump, FALSE if bad.
+ */
+static gboolean
+parse_single_hex_dump_line(char* rec, guint8 *buf, long byte_offset,
+ int in_off) {
+
+ int i;
+ char *s;
+ int value;
+ static int offsets[16] = {39,37,35,33,28,26,24,22,17,15,13,11,6,4,2,0};
+ char lbuf[3] = {0,0,0};
+
+
+ /* Get the byte_offset directly from the record */
+ s = rec;
+ value = strtoul(s + 45 + in_off, NULL, 16);
+
+ if (value != byte_offset) {
+ return FALSE;
+ }
+
+ /* Read the octets right to left, as that is how they are displayed
+ * in VMS.
+ */
+
+ for (i = 0; i < 16; i++) {
+ lbuf[0] = rec[offsets[i] + in_off];
+ lbuf[1] = rec[offsets[i] + 1 + in_off];
+
+ buf[byte_offset + i] = (guint8) strtoul(lbuf, NULL, 16);
+ }
+
+ return TRUE;
+}
git.samba.org / obnox / wireshark / wip.git / commitdiff