forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
reading the capture file. Have callers of "wtap_snapshot_length()" treat a value of 0 as "unknown", and default to WTAP_MAX_PACKET_SIZE (so that, when writing a capture file in a format that *does* store the snapshot length, we can at least put *something* in the file). If we don't know the snapshot length of the current capture file, don't display a value in the summary window. Don't use "cfile.snap" as the snapshot length option when capturing - doing so causes Ethereal to default, when capturing, to the snapshot length of the last capture file that you read in, rather than to the snapshot length of the last capture you did (or the initial default of "no snapshot length"). Redo the "Capture Options" dialog box to group options into sections with frames around them, and add units to the snapshot length, maximum file size, and capture duration options, as per a suggestion by Ulf Lamping. Also add units to the capture count option. Make the snapshot length, capture count, maximum file size, and capture duration options into a combination of a check box and a spin button. If the check box is not checked, the limit in question is inactive (snapshot length of 65535, no max packet count, no max file size, no max capture duration); if it's checked, the spinbox specifies the limit. Default all of the check boxes to "not checked" and all of the spin boxes to small values. Use "gtk_toggle_button_get_active()" rather than directly fetching the state of a check box. svn path=/trunk/; revision=4709
372 lines
10 KiB
C
372 lines
10 KiB
C
/* dbs-etherwatch.c
|
||
*
|
||
* $Id: dbs-etherwatch.c,v 1.3 2002/02/08 10:07:40 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 "dbs-etherwatch.h"
|
||
#include "file_wrappers.h"
|
||
|
||
#include <stdio.h>
|
||
#include <stdlib.h>
|
||
#include <string.h>
|
||
#include <ctype.h>
|
||
|
||
/* This module reads the text output of the 'DBS-ETHERTRACE' command in VMS
|
||
* It was initially based on vms.c.
|
||
*/
|
||
|
||
/*
|
||
Example 'TCPIPTRACE' output data:
|
||
ETHERWATCH X5-008
|
||
42 names and addresses were loaded
|
||
Reading recorded data from PERSISTENCE
|
||
------------------------------------------------------------------------------
|
||
>From 00-D0-C0-D2-4D-60 [MF1] to AA-00-04-00-FC-94 [PSERVB]
|
||
Protocol 08-00 00 00-00-00-00-00, 60 byte buffer at 10-OCT-2001 10:20:45.16
|
||
[E..<8.....Ò.....]- 0-[45 00 00 3C 38 93 00 00 1D 06 D2 12 80 93 11 1A]
|
||
[...Ö.Ò...(¤.....]- 16-[80 93 80 D6 02 D2 02 03 00 28 A4 90 00 00 00 00]
|
||
[.....½.....´....]- 32-[A0 02 FF FF 95 BD 00 00 02 04 05 B4 03 03 04 01]
|
||
[......å..... ]- 48-[01 01 08 0A 90 90 E5 14 00 00 00 00]
|
||
------------------------------------------------------------------------------
|
||
>From 00-D0-C0-D2-4D-60 [MF1] to AA-00-04-00-FC-94 [PSERVB]
|
||
Protocol 08-00 00 00-00-00-00-00, 50 byte buffer at 10-OCT-2001 10:20:45.17
|
||
[E..(8.....Ò%....]- 0-[45 00 00 28 38 94 00 00 1D 06 D2 25 80 93 11 1A]
|
||
[...Ö.Ò...(¤.Z.4w]- 16-[80 93 80 D6 02 D2 02 03 00 28 A4 91 5A 1C 34 77]
|
||
[P.#(Ás.....´....]- 32-[50 10 23 28 C1 73 00 00 02 04 05 B4 03 03 00 00]
|
||
[.. ]- 48-[02 04]
|
||
*/
|
||
|
||
/* Magic text to check for DBS-ETHERWATCH-ness of file */
|
||
static const char dbs_etherwatch_hdr_magic[] =
|
||
{ 'E', 'T', 'H', 'E', 'R', 'W', 'A', 'T', 'C', 'H', ' ', ' '};
|
||
#define DBS_ETHERWATCH_HDR_MAGIC_SIZE \
|
||
(sizeof dbs_etherwatch_hdr_magic / sizeof dbs_etherwatch_hdr_magic[0])
|
||
|
||
/* Magic text for start of packet */
|
||
static const char dbs_etherwatch_rec_magic[] =
|
||
{'F', 'r', 'o', 'm', ' '};
|
||
#define DBS_ETHERWATCH_REC_MAGIC_SIZE \
|
||
(sizeof dbs_etherwatch_rec_magic / sizeof dbs_etherwatch_rec_magic[0])
|
||
|
||
/*
|
||
* XXX - is this the biggest packet we can get?
|
||
*/
|
||
#define DBS_ETHERWATCH_MAX_PACKET_LEN 16384
|
||
|
||
static gboolean dbs_etherwatch_read(wtap *wth, int *err, long *data_offset);
|
||
static int dbs_etherwatch_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);
|
||
static int parse_dbs_etherwatch_hex_dump(FILE_T fh, int pkt_len, guint8* buf, int *err);
|
||
static int parse_dbs_etherwatch_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 dbs_etherwatch_seek_next_packet(wtap *wth)
|
||
{
|
||
int byte;
|
||
unsigned int level = 0;
|
||
|
||
while ((byte = file_getc(wth->fh)) != EOF) {
|
||
if (byte == dbs_etherwatch_rec_magic[level]) {
|
||
level++;
|
||
if (level >= DBS_ETHERWATCH_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 DBS_ETHERWATCH_HEADER_LINES_TO_CHECK 200
|
||
#define DBS_ETHERWATCH_LINE_LENGTH 240
|
||
|
||
/* Look through the first part of a file to see if this is
|
||
* a DBS Ethertrace text trace file.
|
||
*
|
||
* Returns TRUE if it is, FALSE if it isn't.
|
||
*/
|
||
static gboolean dbs_etherwatch_check_file_type(wtap *wth)
|
||
{
|
||
char buf[DBS_ETHERWATCH_LINE_LENGTH];
|
||
int line, byte;
|
||
unsigned int reclen, i, level;
|
||
|
||
buf[DBS_ETHERWATCH_LINE_LENGTH-1] = 0;
|
||
|
||
for (line = 0; line < DBS_ETHERWATCH_HEADER_LINES_TO_CHECK; line++) {
|
||
if (file_gets(buf, DBS_ETHERWATCH_LINE_LENGTH, wth->fh)!=NULL){
|
||
|
||
reclen = strlen(buf);
|
||
if (reclen < DBS_ETHERWATCH_HDR_MAGIC_SIZE)
|
||
continue;
|
||
|
||
level = 0;
|
||
for (i = 0; i < reclen; i++) {
|
||
byte = buf[i];
|
||
if (byte == dbs_etherwatch_hdr_magic[level]) {
|
||
level++;
|
||
if (level >=
|
||
DBS_ETHERWATCH_HDR_MAGIC_SIZE) {
|
||
return TRUE;
|
||
}
|
||
}
|
||
else
|
||
level = 0;
|
||
}
|
||
}
|
||
else
|
||
return FALSE;
|
||
}
|
||
return FALSE;
|
||
}
|
||
|
||
|
||
/* XXX - return -1 on I/O error and actually do something with 'err'. */
|
||
int dbs_etherwatch_open(wtap *wth, int *err)
|
||
{
|
||
/* Look for DBS ETHERWATCH header */
|
||
if (!dbs_etherwatch_check_file_type(wth)) {
|
||
return 0;
|
||
}
|
||
|
||
wth->data_offset = 0;
|
||
wth->file_encap = WTAP_ENCAP_RAW_IP;
|
||
wth->file_type = WTAP_FILE_DBS_ETHERWATCH;
|
||
wth->snapshot_length = 0; /* not known */
|
||
wth->subtype_read = dbs_etherwatch_read;
|
||
wth->subtype_seek_read = dbs_etherwatch_seek_read;
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* Find the next packet and parse it; called from wtap_loop(). */
|
||
static gboolean dbs_etherwatch_read(wtap *wth, int *err, long *data_offset)
|
||
{
|
||
long offset = 0;
|
||
guint8 *buf;
|
||
int pkt_len;
|
||
|
||
/* Find the next packet */
|
||
offset = dbs_etherwatch_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_dbs_etherwatch_rec_hdr(wth, wth->fh, err);
|
||
|
||
/* Make sure we have enough room for the packet */
|
||
buffer_assure_space(wth->frame_buffer, DBS_ETHERWATCH_MAX_PACKET_LEN);
|
||
buf = buffer_start_ptr(wth->frame_buffer);
|
||
|
||
/* Convert the ASCII hex dump to binary data */
|
||
parse_dbs_etherwatch_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
|
||
dbs_etherwatch_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_dbs_etherwatch_rec_hdr(NULL, wth->random_fh, &err);
|
||
|
||
if (pkt_len != len) {
|
||
return -1;
|
||
}
|
||
|
||
parse_dbs_etherwatch_hex_dump(wth->random_fh, pkt_len, pd, &err);
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Parses a packet record header. */
|
||
static int
|
||
parse_dbs_etherwatch_rec_hdr(wtap *wth, FILE_T fh, int *err)
|
||
{
|
||
char line[DBS_ETHERWATCH_LINE_LENGTH];
|
||
int num_items_scanned;
|
||
int pkt_len, csec;
|
||
struct tm time;
|
||
char mon[4];
|
||
guchar *p;
|
||
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, DBS_ETHERWATCH_LINE_LENGTH, fh) == NULL) {
|
||
*err = file_error(fh);
|
||
if (*err == 0) {
|
||
*err = WTAP_ERR_SHORT_READ;
|
||
}
|
||
return -1;
|
||
}
|
||
|
||
/* But that line only contains the mac addresses, so we will ignore
|
||
that line for now. Read the next line */
|
||
if (file_gets(line, DBS_ETHERWATCH_LINE_LENGTH, fh) == NULL) {
|
||
*err = file_error(fh);
|
||
if (*err == 0) {
|
||
*err = WTAP_ERR_SHORT_READ;
|
||
}
|
||
return -1;
|
||
}
|
||
|
||
num_items_scanned = sscanf(line+33, "%d byte buffer at %d-%3s-%d %d:%d:%d.%d",
|
||
&pkt_len,
|
||
&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;
|
||
}
|
||
|
||
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_dbs_etherwatch_hex_dump(FILE_T fh, int pkt_len, guint8* buf, int *err)
|
||
{
|
||
guchar line[DBS_ETHERWATCH_LINE_LENGTH];
|
||
int i, hex_lines;
|
||
|
||
/* 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, DBS_ETHERWATCH_LINE_LENGTH, fh) == NULL) {
|
||
*err = file_error(fh);
|
||
if (*err == 0) {
|
||
*err = WTAP_ERR_SHORT_READ;
|
||
}
|
||
return -1;
|
||
}
|
||
if (!parse_single_hex_dump_line(line, buf, i * 16)) {
|
||
*err = WTAP_ERR_BAD_RECORD;
|
||
return -1;
|
||
}
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
1 2 3 4
|
||
0123456789012345678901234567890123456789012345
|
||
[E..(8.....Ò.....]- 0-[45 00 00 28 38 9B 00 00 1D 06 D2 1E 80 93 11 1A]
|
||
[...Ö.Ò...(¤¿Z.4y]- 16-[80 93 80 D6 02 D2 02 03 00 28 A4 BF 5A 1C 34 79]
|
||
[P.#(ÁC...00000..]- 32-[50 10 23 28 C1 43 00 00 03 30 30 30 30 30 00 00]
|
||
[.0 ]- 48-[03 30]
|
||
*/
|
||
|
||
#define START_POS 28
|
||
#define HEX_LENGTH ((16 * 2) + 15) /* sixteen clumps of 2 bytes with 15 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 pos, i;
|
||
char *s;
|
||
long value;
|
||
|
||
|
||
/* Get the byte_offset directly from the record */
|
||
rec[26] = '\0';
|
||
s = rec + 21;
|
||
value = strtol(s, NULL, 10);
|
||
|
||
if (value != byte_offset) {
|
||
return FALSE;
|
||
}
|
||
|
||
/* Go through the substring representing the values and:
|
||
* 1. Replace any spaces with '0's
|
||
* 2. Place \0's every 3 bytes (to terminate the string)
|
||
*
|
||
* Then read the eight sets of hex bytes
|
||
*/
|
||
|
||
for (pos = START_POS; pos < START_POS + HEX_LENGTH; pos++) {
|
||
if (rec[pos] == ' ') {
|
||
rec[pos] = '0';
|
||
}
|
||
}
|
||
|
||
pos = START_POS;
|
||
for (i = 0; i < 16; i++) {
|
||
rec[pos+2] = '\0';
|
||
|
||
buf[byte_offset + i] = (guint8) strtoul(&rec[pos], NULL, 16);
|
||
pos += 3;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|