forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
That makes them work as input to a mergecap that writes pcapng files. File types that don't have a single per-file encapsulation type need more work, with multiple fake IDBs, one for each packet encapsulation type seen in the file, unless we can generate real IDBs. Change-Id: I2859e4f7fb15ec0c0f31a4044dc15638e5db7826 Reviewed-on: https://code.wireshark.org/review/37983 Petri-Dish: Guy Harris <gharris@sonic.net> Tested-by: Petri Dish Buildbot Reviewed-by: Guy Harris <gharris@sonic.net>
539 lines
18 KiB
C
539 lines
18 KiB
C
/* vms.c
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*
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* Wiretap Library
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* Copyright (c) 2001 by Marc Milgram <ethereal@mmilgram.NOSPAMmail.net>
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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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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#include "config.h"
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#include "wtap-int.h"
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#include "vms.h"
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#include "file_wrappers.h"
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#include <wsutil/strtoi.h>
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#include <stdlib.h>
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#include <string.h>
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/* This module reads the output of the various VMS TCPIP trace utilities
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* such as TCPIPTRACE, TCPTRACE and UCX$TRACE
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*
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* It was initially based on toshiba.c and refined with code from cosine.c
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--------------------------------------------------------------------------------
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Example TCPIPTRACE TCPTRACE 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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Example UCX$TRACE output data:
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UCX INTERnet trace RCV packet seq # = 1 at 14-MAY-2003 11:32:10.93
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IP Version = 4, IHL = 5, TOS = 00, Total Length = 583 = ^x0247
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IP Identifier = ^x702E, 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 = 128 = ^x80, Protocol = 17 = ^x11, Header Checksum = ^x70EC
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IP Source Address = 10.20.4.159
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IP Destination Address = 10.20.4.255
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UDP Source Port = 138, UDP Destination Port = 138
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UDP Header and Datagram Length = 563 = ^x0233, Checksum = ^xB913
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9F04140A 70EC1180 0000702E 47020045 0000 E..G.p.....p....
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B1B80E11 | B9133302 8A008A00 | FF04140A 0010 .........3......
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46484648 45200000 1D028A00 9F04140A 0020 ...........EHFHF
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43414341 4341434D 454D4546 45454550 0030 PEEEFEMEMCACACAC
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--------------------------------------------------------------------------------
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Alternate UCX$TRACE type output data:
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TCPIP INTERnet trace RCV packet seq # = 1 at 23-OCT-1998 15:19:33.29
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IP Version = 4, IHL = 5, TOS = 00, Total Length = 217 = ^x00D9
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IP Identifier = ^x0065, 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 = 32 = ^x20, Protocol = 17 = ^x11, Header Checksum = ^x8F6C
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IP Source Address = 16.20.168.93
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IP Destination Address = 16.20.255.255
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UDP Source Port = 138, UDP Destination Port = 138
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UDP Header and Datagram Length = 197 = ^x00C5, Checksum = ^x0E77
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5DA81410 8F6C1120 00000065 D9000045 0000 E...awe.....l....]
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| 0E77C500 8A008A00 | FFFF1410 0010 ..........w.
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--------------------------------------------------------------------------------
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The only difference between the utilities is the Packet header line, primarily
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the utility identifier and the packet sequence formats.
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There appear to be 2 formats for packet seqencing
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Format 1:
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... packet nn at DD-MMM-YYYY hh:mm:ss.ss
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Format 2:
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... packet seq # = nn at DD-MMM-YYYY hh:mm:ss.ss
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If there are other formats then code will have to be written in parse_vms_packet()
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to handle them.
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--------------------------------------------------------------------------------
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*/
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/* Magic text to check for VMS-ness of file using possible utility names
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*
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*/
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#define VMS_HDR_MAGIC_STR1 "TCPIPtrace"
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#define VMS_HDR_MAGIC_STR2 "TCPtrace"
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#define VMS_HDR_MAGIC_STR3 "INTERnet trace"
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/* Magic text for start of packet */
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#define VMS_REC_MAGIC_STR1 VMS_HDR_MAGIC_STR1
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#define VMS_REC_MAGIC_STR2 VMS_HDR_MAGIC_STR2
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#define VMS_REC_MAGIC_STR3 VMS_HDR_MAGIC_STR3
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#define VMS_HEADER_LINES_TO_CHECK 200
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#define VMS_LINE_LENGTH 240
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static gboolean vms_read(wtap *wth, wtap_rec *rec, Buffer *buf,
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int *err, gchar **err_info, gint64 *data_offset);
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static gboolean vms_seek_read(wtap *wth, gint64 seek_off,
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wtap_rec *rec, Buffer *buf, int *err, gchar **err_info);
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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_packet(FILE_T fh, wtap_rec *rec,
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Buffer *buf, int *err, gchar **err_info);
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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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and sets "*err_info" to null or an additional error string. */
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static long vms_seek_next_packet(wtap *wth, int *err, gchar **err_info)
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{
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long cur_off;
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char buf[VMS_LINE_LENGTH];
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while (1) {
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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, err_info);
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return -1;
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}
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if (file_gets(buf, sizeof(buf), wth->fh) == NULL) {
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/* EOF or error. */
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*err = file_error(wth->fh, err_info);
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break;
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}
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if (strstr(buf, VMS_REC_MAGIC_STR1) ||
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strstr(buf, VMS_REC_MAGIC_STR2) ||
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strstr(buf, VMS_REC_MAGIC_STR2)) {
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g_strlcpy(hdr, buf,VMS_LINE_LENGTH);
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return cur_off;
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}
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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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/* 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 and
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* "*err_info will be set to null or an additional error string.
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*
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* Leaves file handle at beginning 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, gchar **err_info)
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{
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char buf[VMS_LINE_LENGTH];
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guint reclen, line;
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gint64 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, err_info);
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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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/* EOF or error. */
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*err = file_error(wth->fh, err_info);
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return FALSE;
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}
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reclen = (guint) strlen(buf);
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if (reclen < strlen(VMS_HDR_MAGIC_STR1) ||
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reclen < strlen(VMS_HDR_MAGIC_STR2) ||
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reclen < strlen(VMS_HDR_MAGIC_STR3)) {
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continue;
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}
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if (strstr(buf, VMS_HDR_MAGIC_STR1) ||
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strstr(buf, VMS_HDR_MAGIC_STR2) ||
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strstr(buf, VMS_HDR_MAGIC_STR3)) {
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/* Go back to the beginning of this line, so we will
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* re-read it. */
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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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*err = 0;
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return FALSE;
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}
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wtap_open_return_val vms_open(wtap *wth, int *err, gchar **err_info)
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{
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/* Look for VMS header */
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if (!vms_check_file_type(wth, err, err_info)) {
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if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
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return WTAP_OPEN_ERROR;
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return WTAP_OPEN_NOT_MINE;
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}
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wth->file_encap = WTAP_ENCAP_RAW_IP;
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wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_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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wth->file_tsprec = WTAP_TSPREC_CSEC;
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/*
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* Add an IDB; we don't know how many interfaces were
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* involved, so we just say one interface, about which
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* we only know the link-layer type, snapshot length,
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* and time stamp resolution.
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*/
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wtap_add_generated_idb(wth);
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return WTAP_OPEN_MINE;
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}
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/* Find the next packet and parse it; called from wtap_read(). */
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static gboolean vms_read(wtap *wth, wtap_rec *rec, Buffer *buf,
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int *err, gchar **err_info, gint64 *data_offset)
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{
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gint64 offset = 0;
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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, err_info);
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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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*err = file_error(wth->fh, err_info);
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return FALSE;
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}
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*data_offset = offset;
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/* Parse the packet */
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return parse_vms_packet(wth->fh, rec, buf, err, err_info);
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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, gint64 seek_off, wtap_rec *rec,
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Buffer *buf, int *err, gchar **err_info)
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{
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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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if (!parse_vms_packet(wth->random_fh, rec, buf, err, err_info)) {
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if (*err == 0)
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*err = WTAP_ERR_SHORT_READ;
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return FALSE;
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}
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return TRUE;
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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( gchar *line )
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{
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int i, j;
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while (*line && !g_ascii_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 (! g_ascii_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 g_ascii_isspace(*line);
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}
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/* Parses a packet record. */
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static gboolean
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parse_vms_packet(FILE_T fh, wtap_rec *rec, Buffer *buf, int *err, gchar **err_info)
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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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guint32 pkt_len = 0;
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int pktnum;
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int csec = 101;
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struct tm tm;
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char mon[4] = {'J', 'A', 'N', 0};
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gchar *p;
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const gchar *endp;
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static const gchar months[] = "JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC";
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guint32 i;
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int offset = 0;
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guint8 *pd;
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tm.tm_year = 1970;
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tm.tm_mon = 0;
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tm.tm_mday = 1;
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tm.tm_hour = 1;
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tm.tm_min = 1;
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tm.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, err_info);
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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 FALSE;
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}
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line[VMS_LINE_LENGTH] = '\0';
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if ((csec == 101) && (p = strstr(line, "packet ")) != NULL
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&& (! strstr(line, "could not save "))) {
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/* Find text in line starting with "packet ". */
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/* First look for the Format 1 type sequencing */
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num_items_scanned = sscanf(p,
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"packet %9d at %2d-%3s-%4d %2d:%2d:%2d.%9d",
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&pktnum, &tm.tm_mday, mon,
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&tm.tm_year, &tm.tm_hour,
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&tm.tm_min, &tm.tm_sec, &csec);
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/* Next look for the Format 2 type sequencing */
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if (num_items_scanned != 8) {
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num_items_scanned = sscanf(p,
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"packet seq # = %9d at %2d-%3s-%4d %2d:%2d:%2d.%9d",
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&pktnum, &tm.tm_mday, mon,
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&tm.tm_year, &tm.tm_hour,
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&tm.tm_min, &tm.tm_sec, &csec);
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}
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/* if unknown format then exit with error */
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/* We will need to add code to handle new format */
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if (num_items_scanned != 8) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("vms: header line not valid");
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return FALSE;
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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 && ! g_ascii_isdigit(*p))
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p++;
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if ( !*p ) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("vms: Length field not valid");
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return FALSE;
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}
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if (!ws_strtou32(p, &endp, &pkt_len) || (*endp != '\0' && !g_ascii_isspace(*endp))) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("vms: Length field '%s' not valid", p);
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return FALSE;
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}
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break;
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}
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} while (! isdumpline(line));
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if (pkt_len > WTAP_MAX_PACKET_SIZE_STANDARD) {
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/*
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* Probably a corrupt capture file; return an error,
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* so that our caller doesn't blow up trying to allocate
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* space for an immensely-large packet.
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*/
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("vms: File has %u-byte packet, bigger than maximum of %u",
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pkt_len, WTAP_MAX_PACKET_SIZE_STANDARD);
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return FALSE;
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}
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p = strstr(months, mon);
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if (p)
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tm.tm_mon = (int) (p - months) / 3;
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tm.tm_year -= 1900;
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tm.tm_isdst = -1;
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rec->rec_type = REC_TYPE_PACKET;
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rec->presence_flags = WTAP_HAS_TS;
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rec->ts.secs = mktime(&tm);
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rec->ts.nsecs = csec * 10000000;
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rec->rec_header.packet_header.caplen = pkt_len;
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rec->rec_header.packet_header.len = pkt_len;
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/* Make sure we have enough room for the packet */
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ws_buffer_assure_space(buf, pkt_len);
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pd = ws_buffer_start_ptr(buf);
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/* Convert the ASCII hex dump to binary data */
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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, err_info);
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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, err_info);
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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] && !g_ascii_isxdigit(line[offset]))
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offset++;
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}
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if (!parse_single_hex_dump_line(line, pd, i,
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offset, pkt_len - i)) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("vms: hex dump not valid");
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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.
|
|
* errors.
|
|
*
|
|
* XXX - when we support packet drop report information in the
|
|
* Wiretap API, we should parse those lines and return "n" as
|
|
* a packet drop count. */
|
|
if (!file_gets(line, VMS_LINE_LENGTH, fh)) {
|
|
*err = file_error(fh, err_info);
|
|
if (*err == 0) {
|
|
/* There is no next line, so there's no "TCPIPtrace could not
|
|
* save n packets" line; not an error. */
|
|
return TRUE;
|
|
}
|
|
return FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
/*
|
|
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.
|
|
*
|
|
* 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 remaining_bytes) {
|
|
|
|
int i;
|
|
char *s;
|
|
int value;
|
|
static const 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 = (int)strtoul(s + 45 + in_off, NULL, 16); /* XXX - error check? */
|
|
|
|
if (value != byte_offset) {
|
|
return FALSE;
|
|
}
|
|
|
|
if (remaining_bytes > 16)
|
|
remaining_bytes = 16;
|
|
|
|
/* Read the octets right to left, as that is how they are displayed
|
|
* in VMS.
|
|
*/
|
|
|
|
for (i = 0; i < remaining_bytes; 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;
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - https://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|