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wireshark/wiretap/vms.c

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/* vms.c
*
* Wiretap Library
* Copyright (c) 2001 by Marc Milgram <ethereal@mmilgram.NOSPAMmail.net>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/* Notes:
* TCPIPtrace TCP fragments don't have the header line. So, we are never
* to look for that line for the first line of a packet except the first
* packet. This allows us to read fragmented packets. Define
* TCPIPTRACE_FRAGMENTS_HAVE_HEADER_LINE to expect the first line to be
* at the start of every packet.
*/
#include "config.h"
#include "wtap-int.h"
#include "vms.h"
#include "file_wrappers.h"
#include <wsutil/strtoi.h>
#include <stdlib.h>
#include <string.h>
/* This module reads the output of the various VMS TCPIP trace utilities
* such as TCPIPTRACE, TCPTRACE and UCX$TRACE
*
* It was initially based on toshiba.c and refined with code from cosine.c
--------------------------------------------------------------------------------
Example TCPIPTRACE TCPTRACE output data:
TCPIPtrace full display RCV packet 8 at 10-JUL-2001 14:54:19.56
IP Version = 4, IHL = 5, TOS = 00, Total Length = 84 = ^x0054
IP Identifier = ^x178F, Flags (0=0,DF=0,MF=0),
Fragment Offset = 0 = ^x0000, Calculated Offset = 0 = ^x0000
IP TTL = 64 = ^x40, Protocol = 17 = ^x11, Header Checksum = ^x4C71
IP Source Address = 10.12.1.80
IP Destination Address = 10.12.1.50
UDP Source Port = 731, UDP Destination Port = 111
UDP Header and Datagram Length = 64 = ^x0040, Checksum = ^xB6C0
50010C0A 714C1140 00008F17 54000045 0000 E..T....@.Lq...P
27E54C3C | C0B64000 6F00DB02 | 32010C0A 0010 ...2...o.@..<L.'
02000000 A0860100 02000000 00000000 0020 ................
00000000 00000000 00000000 03000000 0030 ................
06000000 01000000 A5860100 00000000 0040 ................
00000000 0050 ....
--------------------------------------------------------------------------------
Example UCX$TRACE output data:
UCX INTERnet trace RCV packet seq # = 1 at 14-MAY-2003 11:32:10.93
IP Version = 4, IHL = 5, TOS = 00, Total Length = 583 = ^x0247
IP Identifier = ^x702E, Flags (0=0,DF=0,MF=0),
Fragment Offset = 0 = ^x0000, Calculated Offset = 0 = ^x0000
IP TTL = 128 = ^x80, Protocol = 17 = ^x11, Header Checksum = ^x70EC
IP Source Address = 10.20.4.159
IP Destination Address = 10.20.4.255
UDP Source Port = 138, UDP Destination Port = 138
UDP Header and Datagram Length = 563 = ^x0233, Checksum = ^xB913
9F04140A 70EC1180 0000702E 47020045 0000 E..G.p.....p....
B1B80E11 | B9133302 8A008A00 | FF04140A 0010 .........3......
46484648 45200000 1D028A00 9F04140A 0020 ...........EHFHF
43414341 4341434D 454D4546 45454550 0030 PEEEFEMEMCACACAC
--------------------------------------------------------------------------------
Alternate UCX$TRACE type output data:
TCPIP INTERnet trace RCV packet seq # = 1 at 23-OCT-1998 15:19:33.29
IP Version = 4, IHL = 5, TOS = 00, Total Length = 217 = ^x00D9
IP Identifier = ^x0065, Flags (0=0,DF=0,MF=0),
Fragment Offset = 0 = ^x0000, Calculated Offset = 0 = ^x0000
IP TTL = 32 = ^x20, Protocol = 17 = ^x11, Header Checksum = ^x8F6C
IP Source Address = 16.20.168.93
IP Destination Address = 16.20.255.255
UDP Source Port = 138, UDP Destination Port = 138
UDP Header and Datagram Length = 197 = ^x00C5, Checksum = ^x0E77
5DA81410 8F6C1120 00000065 D9000045 0000 E...awe.....l....]
| 0E77C500 8A008A00 | FFFF1410 0010 ..........w.
--------------------------------------------------------------------------------
The only difference between the utilities is the Packet header line, primarily
the utility identifier and the packet sequence formats.
There appear to be 2 formats for packet sequencing
Format 1:
... packet nn at DD-MMM-YYYY hh:mm:ss.ss
Format 2:
... packet seq # = nn at DD-MMM-YYYY hh:mm:ss.ss
If there are other formats then code will have to be written in parse_vms_packet()
to handle them.
--------------------------------------------------------------------------------
*/
/* Magic text to check for VMS-ness of file using possible utility names
*
*/
#define VMS_HDR_MAGIC_STR1 "TCPIPtrace"
#define VMS_HDR_MAGIC_STR2 "TCPtrace"
#define VMS_HDR_MAGIC_STR3 "INTERnet trace"
/* Magic text for start of packet */
#define VMS_REC_MAGIC_STR1 VMS_HDR_MAGIC_STR1
#define VMS_REC_MAGIC_STR2 VMS_HDR_MAGIC_STR2
#define VMS_REC_MAGIC_STR3 VMS_HDR_MAGIC_STR3
#define VMS_HEADER_LINES_TO_CHECK 200
#define VMS_LINE_LENGTH 240
static gboolean vms_read(wtap *wth, wtap_rec *rec, Buffer *buf,
int *err, gchar **err_info, gint64 *data_offset);
static gboolean vms_seek_read(wtap *wth, gint64 seek_off,
wtap_rec *rec, Buffer *buf, int *err, gchar **err_info);
static gboolean parse_single_hex_dump_line(char* rec, guint8 *buf,
long byte_offset, int in_off, int remaining_bytes);
static gboolean parse_vms_packet(FILE_T fh, wtap_rec *rec,
Buffer *buf, int *err, gchar **err_info);
static int vms_file_type_subtype = -1;
void register_vms(void);
#ifdef TCPIPTRACE_FRAGMENTS_HAVE_HEADER_LINE
/* Seeks to the beginning of the next packet, and returns the
byte offset. Returns -1 on failure, and sets "*err" to the error
and sets "*err_info" to null or an additional error string. */
static long vms_seek_next_packet(wtap *wth, int *err, gchar **err_info)
{
long cur_off;
char buf[VMS_LINE_LENGTH];
while (1) {
cur_off = file_tell(wth->fh);
if (cur_off == -1) {
/* Error */
*err = file_error(wth->fh, err_info);
return -1;
}
if (file_gets(buf, sizeof(buf), wth->fh) == NULL) {
/* EOF or error. */
*err = file_error(wth->fh, err_info);
break;
}
if (strstr(buf, VMS_REC_MAGIC_STR1) ||
strstr(buf, VMS_REC_MAGIC_STR2) ||
strstr(buf, VMS_REC_MAGIC_STR2)) {
(void) g_strlcpy(hdr, buf,VMS_LINE_LENGTH);
return cur_off;
}
}
return -1;
}
#endif /* TCPIPTRACE_FRAGMENTS_HAVE_HEADER_LINE */
/* 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 or if we get an I/O error;
* if we get an I/O error, "*err" will be set to a non-zero value and
* "*err_info will be set to null or an additional error string.
*
* Leaves file handle at beginning of line that contains the VMS Magic
* identifier.
*/
static gboolean vms_check_file_type(wtap *wth, int *err, gchar **err_info)
{
char buf[VMS_LINE_LENGTH];
guint reclen, line;
gint64 mpos;
buf[VMS_LINE_LENGTH-1] = '\0';
for (line = 0; line < VMS_HEADER_LINES_TO_CHECK; line++) {
mpos = file_tell(wth->fh);
if (mpos == -1) {
/* Error. */
*err = file_error(wth->fh, err_info);
return FALSE;
}
if (file_gets(buf, VMS_LINE_LENGTH, wth->fh) == NULL) {
/* EOF or error. */
*err = file_error(wth->fh, err_info);
return FALSE;
}
reclen = (guint) strlen(buf);
if (reclen < strlen(VMS_HDR_MAGIC_STR1) ||
reclen < strlen(VMS_HDR_MAGIC_STR2) ||
reclen < strlen(VMS_HDR_MAGIC_STR3)) {
continue;
}
if (strstr(buf, VMS_HDR_MAGIC_STR1) ||
strstr(buf, VMS_HDR_MAGIC_STR2) ||
strstr(buf, VMS_HDR_MAGIC_STR3)) {
/* Go back to the beginning of this line, so we will
* re-read it. */
if (file_seek(wth->fh, mpos, SEEK_SET, err) == -1) {
/* Error. */
return FALSE;
}
return TRUE;
}
}
*err = 0;
return FALSE;
}
wtap_open_return_val vms_open(wtap *wth, int *err, gchar **err_info)
{
/* Look for VMS header */
if (!vms_check_file_type(wth, err, err_info)) {
if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
return WTAP_OPEN_ERROR;
return WTAP_OPEN_NOT_MINE;
}
wth->file_encap = WTAP_ENCAP_RAW_IP;
wth->file_type_subtype = vms_file_type_subtype;
wth->snapshot_length = 0; /* not known */
wth->subtype_read = vms_read;
wth->subtype_seek_read = vms_seek_read;
wth->file_tsprec = WTAP_TSPREC_CSEC;
/*
* Add an IDB; we don't know how many interfaces were
* involved, so we just say one interface, about which
* we only know the link-layer type, snapshot length,
* and time stamp resolution.
*/
wtap_add_generated_idb(wth);
return WTAP_OPEN_MINE;
}
/* Find the next packet and parse it; called from wtap_read(). */
static gboolean vms_read(wtap *wth, wtap_rec *rec, Buffer *buf,
int *err, gchar **err_info, gint64 *data_offset)
{
gint64 offset = 0;
/* Find the next packet */
#ifdef TCPIPTRACE_FRAGMENTS_HAVE_HEADER_LINE
offset = vms_seek_next_packet(wth, err, err_info);
#else
offset = file_tell(wth->fh);
#endif
if (offset < 1) {
*err = file_error(wth->fh, err_info);
return FALSE;
}
*data_offset = offset;
/* Parse the packet */
return parse_vms_packet(wth->fh, rec, buf, err, err_info);
}
/* Used to read packets in random-access fashion */
static gboolean
vms_seek_read(wtap *wth, gint64 seek_off, wtap_rec *rec,
Buffer *buf, int *err, gchar **err_info)
{
if (file_seek(wth->random_fh, seek_off - 1, SEEK_SET, err) == -1)
return FALSE;
if (!parse_vms_packet(wth->random_fh, rec, buf, err, err_info)) {
if (*err == 0)
*err = WTAP_ERR_SHORT_READ;
return FALSE;
}
return TRUE;
}
/* isdumpline assumes that dump lines start with some non-alphanumerics
* followed by 4 hex numbers - each 8 digits long, each hex number followed
* by 3 spaces.
*/
static int
isdumpline( gchar *line )
{
int i, j;
while (*line && !g_ascii_isalnum(*line))
line++;
for (j=0; j<4; j++) {
for (i=0; i<8; i++, line++)
if (! g_ascii_isxdigit(*line))
return FALSE;
for (i=0; i<3; i++, line++)
if (*line != ' ')
return FALSE;
}
return g_ascii_isspace(*line);
}
/* Parses a packet record. */
static gboolean
parse_vms_packet(FILE_T fh, wtap_rec *rec, Buffer *buf, int *err, gchar **err_info)
{
char line[VMS_LINE_LENGTH + 1];
int num_items_scanned;
guint32 pkt_len = 0;
int pktnum;
int csec = 101;
struct tm tm;
char mon[4] = {'J', 'A', 'N', 0};
gchar *p;
const gchar *endp;
static const gchar months[] = "JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC";
guint32 i;
int offset = 0;
guint8 *pd;
tm.tm_year = 1970;
tm.tm_mon = 0;
tm.tm_mday = 1;
tm.tm_hour = 1;
tm.tm_min = 1;
tm.tm_sec = 1;
/* Skip lines until one starts with a hex number */
do {
if (file_gets(line, VMS_LINE_LENGTH, fh) == NULL) {
*err = file_error(fh, err_info);
if ((*err == 0) && (csec != 101)) {
*err = WTAP_ERR_SHORT_READ;
}
return FALSE;
}
line[VMS_LINE_LENGTH] = '\0';
if ((csec == 101) && (p = strstr(line, "packet ")) != NULL
&& (! strstr(line, "could not save "))) {
/* Find text in line starting with "packet ". */
/* First look for the Format 1 type sequencing */
num_items_scanned = sscanf(p,
"packet %9d at %2d-%3s-%4d %2d:%2d:%2d.%9d",
&pktnum, &tm.tm_mday, mon,
&tm.tm_year, &tm.tm_hour,
&tm.tm_min, &tm.tm_sec, &csec);
/* Next look for the Format 2 type sequencing */
if (num_items_scanned != 8) {
num_items_scanned = sscanf(p,
"packet seq # = %9d at %2d-%3s-%4d %2d:%2d:%2d.%9d",
&pktnum, &tm.tm_mday, mon,
&tm.tm_year, &tm.tm_hour,
&tm.tm_min, &tm.tm_sec, &csec);
}
/* if unknown format then exit with error */
/* We will need to add code to handle new format */
if (num_items_scanned != 8) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup("vms: header line not valid");
return FALSE;
}
}
if ( (! pkt_len) && (p = strstr(line, "Length"))) {
p += sizeof("Length ");
while (*p && ! g_ascii_isdigit(*p))
p++;
if ( !*p ) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup("vms: Length field not valid");
return FALSE;
}
if (!ws_strtou32(p, &endp, &pkt_len) || (*endp != '\0' && !g_ascii_isspace(*endp))) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("vms: Length field '%s' not valid", p);
return FALSE;
}
break;
}
} while (! isdumpline(line));
if (pkt_len > WTAP_MAX_PACKET_SIZE_STANDARD) {
/*
* Probably a corrupt capture file; return an error,
* so that our caller doesn't blow up trying to allocate
* space for an immensely-large packet.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("vms: File has %u-byte packet, bigger than maximum of %u",
pkt_len, WTAP_MAX_PACKET_SIZE_STANDARD);
return FALSE;
}
p = strstr(months, mon);
if (p)
tm.tm_mon = (int) (p - months) / 3;
tm.tm_year -= 1900;
tm.tm_isdst = -1;
rec->rec_type = REC_TYPE_PACKET;
rec->block = wtap_block_create(WTAP_BLOCK_PACKET);
rec->presence_flags = WTAP_HAS_TS;
rec->ts.secs = mktime(&tm);
rec->ts.nsecs = csec * 10000000;
rec->rec_header.packet_header.caplen = pkt_len;
rec->rec_header.packet_header.len = pkt_len;
/* Make sure we have enough room for the packet */
ws_buffer_assure_space(buf, pkt_len);
pd = ws_buffer_start_ptr(buf);
/* Convert the ASCII hex dump to binary data */
for (i = 0; i < pkt_len; i += 16) {
if (file_gets(line, VMS_LINE_LENGTH, fh) == NULL) {
*err = file_error(fh, err_info);
if (*err == 0) {
*err = WTAP_ERR_SHORT_READ;
}
return FALSE;
}
line[VMS_LINE_LENGTH] = '\0';
if (i == 0) {
while (! isdumpline(line)) { /* advance to start of hex data */
if (file_gets(line, VMS_LINE_LENGTH, fh) == NULL) {
*err = file_error(fh, err_info);
if (*err == 0) {
*err = WTAP_ERR_SHORT_READ;
}
return FALSE;
}
line[VMS_LINE_LENGTH] = '\0';
}
while (line[offset] && !g_ascii_isxdigit(line[offset]))
offset++;
}
if (!parse_single_hex_dump_line(line, pd, i,
offset, pkt_len - i)) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup("vms: hex dump not valid");
return FALSE;
}
}
/* 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;
}
static const struct supported_block_type vms_blocks_supported[] = {
/*
* We support packet blocks, with no comments or other options.
*/
{ WTAP_BLOCK_PACKET, MULTIPLE_BLOCKS_SUPPORTED, NO_OPTIONS_SUPPORTED }
};
static const struct file_type_subtype_info vms_info = {
"TCPIPtrace (VMS)", "tcpiptrace", "txt", NULL,
FALSE, BLOCKS_SUPPORTED(vms_blocks_supported),
NULL, NULL, NULL
};
void register_vms(void)
{
vms_file_type_subtype = wtap_register_file_type_subtype(&vms_info);
/*
* Register name for backwards compatibility with the
* wtap_filetypes table in Lua.
*/
wtap_register_backwards_compatibility_lua_name("VMS",
vms_file_type_subtype);
}
/*
* 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:
*/
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