![Guy Harris](/assets/img/avatar_default.png)
"mktime()" bases the DST-vs-non-DST decision on the date/time and on the current time zone. svn path=/trunk/; revision=6406
471 lines
13 KiB
C
471 lines
13 KiB
C
/* vms.c
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*
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* $Id: vms.c,v 1.15 2002/10/10 21:47:12 guy Exp $
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*
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* Wiretap Library
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* Copyright (c) 2001 by Marc Milgram <mmilgram@arrayinc.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/* Notes:
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* TCPIPtrace TCP fragments don't have the header line. So, we are never
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* to look for that line for the first line of a packet except the first
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* packet. This allows us to read fragmented packets. Define
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* TCPIPTRACE_FRAGMENTS_HAVE_HEADER_LINE to expect the first line to be
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* at the start of every packet.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "wtap-int.h"
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#include "buffer.h"
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#include "vms.h"
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#include "file_wrappers.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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/* This module reads the output of the 'TCPIPTRACE' command in VMS
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* It was initially based on toshiba.c.
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*/
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/*
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Example 'TCPIPTRACE' output data:
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TCPIPtrace full display RCV packet 8 at 10-JUL-2001 14:54:19.56
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IP Version = 4, IHL = 5, TOS = 00, Total Length = 84 = ^x0054
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IP Identifier = ^x178F, Flags (0=0,DF=0,MF=0),
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Fragment Offset = 0 = ^x0000, Calculated Offset = 0 = ^x0000
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IP TTL = 64 = ^x40, Protocol = 17 = ^x11, Header Checksum = ^x4C71
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IP Source Address = 10.12.1.80
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IP Destination Address = 10.12.1.50
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UDP Source Port = 731, UDP Destination Port = 111
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UDP Header and Datagram Length = 64 = ^x0040, Checksum = ^xB6C0
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50010C0A 714C1140 00008F17 54000045 0000 E..T....@.Lq...P
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27E54C3C | C0B64000 6F00DB02 | 32010C0A 0010 ...2...o.@..<L.'
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02000000 A0860100 02000000 00000000 0020 ................
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00000000 00000000 00000000 03000000 0030 ................
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06000000 01000000 A5860100 00000000 0040 ................
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00000000 0050 ....
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--------------------------------------------------------------------------------
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*/
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/* Magic text to check for VMS-ness of file */
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static const char vms_hdr_magic[] =
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{ 'T', 'C', 'P', 'I', 'P', 't', 'r', 'a', 'c', 'e', ' '};
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#define VMS_HDR_MAGIC_SIZE (sizeof vms_hdr_magic / sizeof vms_hdr_magic[0])
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/* Magic text for start of packet */
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#define vms_rec_magic vms_hdr_magic
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#define VMS_REC_MAGIC_SIZE (sizeof vms_rec_magic / sizeof vms_rec_magic[0])
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static gboolean vms_read(wtap *wth, int *err, long *data_offset);
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static gboolean vms_seek_read(wtap *wth, long seek_off,
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union wtap_pseudo_header *pseudo_header, guint8 *pd, int len, int *err);
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static gboolean parse_single_hex_dump_line(char* rec, guint8 *buf,
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long byte_offset, int in_off, int remaining_bytes);
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static gboolean parse_vms_hex_dump(FILE_T fh, int pkt_len, guint8* buf,
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int *err);
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static int parse_vms_rec_hdr(wtap *wth, FILE_T fh, int *err);
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#ifdef TCPIPTRACE_FRAGMENTS_HAVE_HEADER_LINE
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/* Seeks to the beginning of the next packet, and returns the
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byte offset. Returns -1 on failure, and sets "*err" to the error. */
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static long vms_seek_next_packet(wtap *wth, int *err)
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{
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int byte;
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unsigned int level = 0;
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long cur_off;
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while ((byte = file_getc(wth->fh)) != EOF) {
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if ((level == 3) && (byte != vms_rec_magic[level]))
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level += 2; /* Accept TCPtrace as well as TCPIPtrace */
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if (byte == vms_rec_magic[level]) {
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level++;
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if (level >= VMS_REC_MAGIC_SIZE) {
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/* note: we're leaving file pointer right after the magic characters */
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cur_off = file_tell(wth->fh);
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if (cur_off == -1) {
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/* Error. */
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*err = file_error(wth->fh);
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return -1;
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}
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return cur_off + 1;
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}
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} else {
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level = 0;
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}
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}
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if (file_eof(wth->fh)) {
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/* We got an EOF. */
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*err = 0;
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} else {
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/* We (presumably) got an error (there's no equivalent to "ferror()"
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in zlib, alas, so we don't have a wrapper to check for an error). */
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*err = file_error(wth->fh);
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}
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return -1;
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}
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#endif /* TCPIPTRACE_FRAGMENTS_HAVE_HEADER_LINE */
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#define VMS_HEADER_LINES_TO_CHECK 200
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#define VMS_LINE_LENGTH 240
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/* Look through the first part of a file to see if this is
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* a VMS trace file.
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*
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* Returns TRUE if it is, FALSE if it isn't or if we get an I/O error;
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* if we get an I/O error, "*err" will be set to a non-zero value.
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*
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* Leaves file handle at begining of line that contains the VMS Magic
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* identifier.
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*/
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static gboolean vms_check_file_type(wtap *wth, int *err)
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{
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char buf[VMS_LINE_LENGTH];
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int line, byte;
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unsigned int reclen, i, level;
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long mpos;
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buf[VMS_LINE_LENGTH-1] = 0;
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for (line = 0; line < VMS_HEADER_LINES_TO_CHECK; line++) {
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mpos = file_tell(wth->fh);
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if (mpos == -1) {
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/* Error. */
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*err = file_error(wth->fh);
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return FALSE;
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}
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if (file_gets(buf, VMS_LINE_LENGTH, wth->fh) != NULL) {
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reclen = strlen(buf);
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if (reclen < VMS_HDR_MAGIC_SIZE)
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continue;
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level = 0;
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for (i = 0; i < reclen; i++) {
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byte = buf[i];
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if ((level == 3) && (byte != vms_hdr_magic[level]))
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level += 2; /* Accept TCPIPtrace as well as TCPtrace */
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if (byte == vms_hdr_magic[level]) {
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level++;
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if (level >= VMS_HDR_MAGIC_SIZE) {
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if (file_seek(wth->fh, mpos, SEEK_SET, err) == -1) {
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/* Error. */
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return FALSE;
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}
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return TRUE;
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}
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}
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else
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level = 0;
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}
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}
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else {
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/* EOF or error. */
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if (file_eof(wth->fh))
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*err = 0;
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else
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*err = file_error(wth->fh);
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return FALSE;
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}
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}
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*err = 0;
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return FALSE;
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}
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int vms_open(wtap *wth, int *err)
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{
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/* Look for VMS header */
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if (!vms_check_file_type(wth, err)) {
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if (*err == 0)
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return 0;
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else
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return -1;
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}
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wth->data_offset = 0;
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wth->file_encap = WTAP_ENCAP_RAW_IP;
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wth->file_type = WTAP_FILE_VMS;
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wth->snapshot_length = 0; /* not known */
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wth->subtype_read = vms_read;
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wth->subtype_seek_read = vms_seek_read;
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return 1;
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}
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/* Find the next packet and parse it; called from wtap_loop(). */
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static gboolean vms_read(wtap *wth, int *err, long *data_offset)
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{
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long offset = 0;
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guint8 *buf;
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int pkt_len;
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/* Find the next packet */
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#ifdef TCPIPTRACE_FRAGMENTS_HAVE_HEADER_LINE
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offset = vms_seek_next_packet(wth, err);
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#else
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offset = file_tell(wth->fh);
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#endif
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if (offset < 1)
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return FALSE;
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/* Parse the header */
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pkt_len = parse_vms_rec_hdr(wth, wth->fh, err);
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if (pkt_len == -1)
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return FALSE;
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/* Make sure we have enough room for the packet */
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buffer_assure_space(wth->frame_buffer, pkt_len);
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buf = buffer_start_ptr(wth->frame_buffer);
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/* Convert the ASCII hex dump to binary data */
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if (!parse_vms_hex_dump(wth->fh, pkt_len, buf, err))
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return FALSE;
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wth->data_offset = offset;
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*data_offset = offset;
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return TRUE;
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}
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/* Used to read packets in random-access fashion */
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static gboolean
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vms_seek_read (wtap *wth, long seek_off,
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union wtap_pseudo_header *pseudo_header _U_,
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guint8 *pd, int len, int *err)
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{
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int pkt_len;
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if (file_seek(wth->random_fh, seek_off - 1, SEEK_SET, err) == -1)
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return FALSE;
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pkt_len = parse_vms_rec_hdr(NULL, wth->random_fh, err);
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if (pkt_len != len) {
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if (pkt_len != -1)
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*err = WTAP_ERR_BAD_RECORD;
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return FALSE;
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}
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return parse_vms_hex_dump(wth->random_fh, pkt_len, pd, err);
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}
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/* isdumpline assumes that dump lines start with some non-alphanumerics
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* followed by 4 hex numbers - each 8 digits long, each hex number followed
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* by 3 spaces.
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*/
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static int
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isdumpline( guchar *line )
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{
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int i, j;
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while (*line && !isalnum(*line))
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line++;
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for (j=0; j<4; j++) {
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for (i=0; i<8; i++, line++)
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if (! isxdigit(*line))
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return FALSE;
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for (i=0; i<3; i++, line++)
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if (*line != ' ')
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return FALSE;
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}
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return isspace(*line);
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}
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/* Parses a packet record header. */
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static int
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parse_vms_rec_hdr(wtap *wth, FILE_T fh, int *err)
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{
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char line[VMS_LINE_LENGTH + 1];
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int num_items_scanned;
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int pkt_len = 0;
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int pktnum;
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int csec = 101;
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struct tm time;
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char mon[4] = {'J', 'A', 'N', 0};
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guchar *p;
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static guchar months[] = "JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC";
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time.tm_year = 1970;
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time.tm_hour = 1;
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time.tm_min = 1;
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time.tm_sec = 1;
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/* Skip lines until one starts with a hex number */
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do {
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if (file_gets(line, VMS_LINE_LENGTH, fh) == NULL) {
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*err = file_error(fh);
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if ((*err == 0) && (csec != 101)) {
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*err = WTAP_ERR_SHORT_READ;
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}
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return -1;
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}
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line[VMS_LINE_LENGTH] = '\0';
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if ((csec == 101) && (p = strstr(line, "packet "))
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&& (! strstr(line, "could not save "))) {
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/* Find text in line starting with "packet ". */
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num_items_scanned = sscanf(p,
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"packet %d at %d-%3s-%d %d:%d:%d.%d",
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&pktnum, &time.tm_mday, mon,
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&time.tm_year, &time.tm_hour,
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&time.tm_min, &time.tm_sec, &csec);
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if (num_items_scanned != 8) {
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*err = WTAP_ERR_BAD_RECORD;
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return -1;
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}
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}
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if ( (! pkt_len) && (p = strstr(line, "Length"))) {
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p += sizeof("Length ");
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while (*p && ! isdigit(*p))
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p++;
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if ( !*p ) {
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*err = WTAP_ERR_BAD_RECORD;
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return -1;
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}
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pkt_len = atoi(p);
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break;
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}
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} while (! isdumpline(line));
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if (wth) {
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p = strstr(months, mon);
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if (p)
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time.tm_mon = (p - months) / 3;
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time.tm_year -= 1900;
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time.tm_isdst = -1;
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wth->phdr.ts.tv_sec = mktime(&time);
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wth->phdr.ts.tv_usec = csec * 10000;
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wth->phdr.caplen = pkt_len;
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wth->phdr.len = pkt_len;
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wth->phdr.pkt_encap = WTAP_ENCAP_RAW_IP;
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}
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return pkt_len;
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}
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/* Converts ASCII hex dump to binary data */
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static gboolean
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parse_vms_hex_dump(FILE_T fh, int pkt_len, guint8* buf, int *err)
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{
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guchar line[VMS_LINE_LENGTH + 1];
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int i;
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int offset = 0;
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for (i = 0; i < pkt_len; i += 16) {
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if (file_gets(line, VMS_LINE_LENGTH, fh) == NULL) {
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*err = file_error(fh);
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if (*err == 0) {
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*err = WTAP_ERR_SHORT_READ;
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}
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return FALSE;
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}
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line[VMS_LINE_LENGTH] = '\0';
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if (i == 0) {
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while (! isdumpline(line)) { /* advance to start of hex data */
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if (file_gets(line, VMS_LINE_LENGTH, fh) == NULL) {
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*err = file_error(fh);
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if (*err == 0) {
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*err = WTAP_ERR_SHORT_READ;
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}
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return FALSE;
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}
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line[VMS_LINE_LENGTH] = '\0';
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}
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while (line[offset] && !isxdigit(line[offset]))
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offset++;
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}
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if (!parse_single_hex_dump_line(line, buf, i,
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offset, pkt_len - i)) {
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*err = WTAP_ERR_BAD_RECORD;
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return FALSE;
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}
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}
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/* Avoid TCPIPTRACE-W-BUFFERSFUL, TCPIPtrace could not save n packets.
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* errors. */
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file_gets(line, VMS_LINE_LENGTH, fh);
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return TRUE;
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}
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/*
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1 2 3 4
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0123456789012345678901234567890123456789012345
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50010C0A A34C0640 00009017 2C000045 0000 E..,....@.L....P
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00000000 14945E52 0A00DC02 | 32010C0A 0010 ...2....R^......
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0000 | B4050402 00003496 00020260 0020 `....4........
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*/
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#define START_POS 7
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#define HEX_LENGTH ((8 * 4) + 7) /* eight clumps of 4 bytes with 7 inner spaces */
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/* Take a string representing one line from a hex dump and converts the
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* text to binary data. We check the printed offset with the offset
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* we are passed to validate the record. We place the bytes in the buffer
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* at the specified offset.
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*
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* Returns TRUE if good hex dump, FALSE if bad.
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*/
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static gboolean
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parse_single_hex_dump_line(char* rec, guint8 *buf, long byte_offset,
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int in_off, int remaining) {
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int i;
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char *s;
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int value;
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static int offsets[16] = {39,37,35,33,28,26,24,22,17,15,13,11,6,4,2,0};
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char lbuf[3] = {0,0,0};
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/* Get the byte_offset directly from the record */
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s = rec;
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value = strtoul(s + 45 + in_off, NULL, 16);
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if (value != byte_offset) {
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return FALSE;
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}
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if (remaining > 16)
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remaining = 16;
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/* Read the octets right to left, as that is how they are displayed
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* in VMS.
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*/
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for (i = 0; i < remaining; i++) {
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lbuf[0] = rec[offsets[i] + in_off];
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lbuf[1] = rec[offsets[i] + 1 + in_off];
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buf[byte_offset + i] = (guint8) strtoul(lbuf, NULL, 16);
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}
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return TRUE;
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}
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