2011-10-26 02:18:55 +00:00
|
|
|
/* aethra.c
|
|
|
|
*
|
|
|
|
* $Id$
|
|
|
|
*
|
|
|
|
* Wiretap Library
|
|
|
|
* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
|
|
|
|
*
|
|
|
|
* 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 <errno.h>
|
|
|
|
#include <string.h>
|
|
|
|
#include "wtap-int.h"
|
|
|
|
#include "file_wrappers.h"
|
|
|
|
#include "buffer.h"
|
|
|
|
#include "aethra.h"
|
|
|
|
|
|
|
|
/* Magic number in Aethra PC108 files. */
|
2011-10-26 02:37:45 +00:00
|
|
|
static const char aethra_magic[5] = {
|
|
|
|
'V', '0', '2', '0', '8'
|
|
|
|
};
|
2011-10-26 02:18:55 +00:00
|
|
|
|
|
|
|
/* Aethra file header (minus magic number). */
|
|
|
|
struct aethra_hdr {
|
|
|
|
guint8 unknown[5415];
|
|
|
|
};
|
|
|
|
|
|
|
|
/* Aethra record header. Yes, the alignment is weird.
|
|
|
|
All multi-byte fields are little-endian. */
|
|
|
|
struct aethrarec_hdr {
|
|
|
|
guint8 rec_size[2]; /* record length, not counting the length itself */
|
|
|
|
guint8 unknown1;
|
|
|
|
guint8 timestamp[4]; /* milliseconds since start of capture */
|
|
|
|
guint8 flags; /* low-order bit: 0 = N->U, 1 = U->N */
|
|
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Flags.
|
|
|
|
*/
|
|
|
|
#define AETHRA_U_TO_N 0x01
|
|
|
|
|
|
|
|
static gboolean aethra_read(wtap *wth, int *err, gchar **err_info,
|
|
|
|
gint64 *data_offset);
|
|
|
|
static gboolean aethra_seek_read(wtap *wth, gint64 seek_off,
|
|
|
|
union wtap_pseudo_header *pseudo_header, guint8 *pd, int length,
|
|
|
|
int *err, gchar **err_info);
|
|
|
|
static gboolean aethra_read_rec_header(FILE_T fh, struct aethrarec_hdr *hdr,
|
|
|
|
union wtap_pseudo_header *pseudo_header, int *err, gchar **err_info);
|
|
|
|
static gboolean aethra_read_rec_data(FILE_T fh, guint8 *pd, int length,
|
|
|
|
int *err, gchar **err_info);
|
|
|
|
|
|
|
|
int aethra_open(wtap *wth, int *err, gchar **err_info)
|
|
|
|
{
|
|
|
|
int bytes_read;
|
|
|
|
char magic[sizeof aethra_magic];
|
|
|
|
struct aethra_hdr hdr;
|
|
|
|
|
|
|
|
/* Read in the string that should be at the start of a "aethra" file */
|
|
|
|
errno = WTAP_ERR_CANT_READ;
|
|
|
|
bytes_read = file_read(magic, sizeof magic, wth->fh);
|
|
|
|
if (bytes_read != sizeof magic) {
|
|
|
|
*err = file_error(wth->fh, err_info);
|
|
|
|
if (*err != 0)
|
|
|
|
return -1;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
wth->data_offset += sizeof magic;
|
|
|
|
|
|
|
|
if (memcmp(magic, aethra_magic, sizeof aethra_magic) != 0) {
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Read the rest of the header. */
|
|
|
|
errno = WTAP_ERR_CANT_READ;
|
|
|
|
bytes_read = file_read(&hdr, sizeof hdr, wth->fh);
|
|
|
|
if (bytes_read != sizeof hdr) {
|
|
|
|
*err = file_error(wth->fh, err_info);
|
|
|
|
if (*err != 0)
|
|
|
|
return -1;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
wth->data_offset += sizeof hdr;
|
|
|
|
wth->file_type = WTAP_FILE_AETHRA;
|
|
|
|
wth->subtype_read = aethra_read;
|
|
|
|
wth->subtype_seek_read = aethra_seek_read;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We've only seen ISDN files, so, for now, we treat all
|
|
|
|
* files as ISDN.
|
|
|
|
*/
|
|
|
|
wth->file_encap = WTAP_ENCAP_ISDN;
|
|
|
|
wth->snapshot_length = 0; /* not available in header */
|
|
|
|
wth->tsprecision = WTAP_FILE_TSPREC_MSEC;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Read the next packet */
|
|
|
|
static gboolean aethra_read(wtap *wth, int *err, gchar **err_info,
|
|
|
|
gint64 *data_offset)
|
|
|
|
{
|
|
|
|
struct aethrarec_hdr hdr;
|
|
|
|
guint32 rec_size;
|
|
|
|
guint32 packet_size;
|
|
|
|
guint32 msecs;
|
|
|
|
|
|
|
|
*data_offset = wth->data_offset;
|
|
|
|
|
|
|
|
/* Read record header. */
|
|
|
|
if (!aethra_read_rec_header(wth->fh, &hdr, &wth->pseudo_header, err,
|
|
|
|
err_info))
|
|
|
|
return FALSE;
|
|
|
|
|
|
|
|
rec_size = pletohs(hdr.rec_size);
|
|
|
|
if (rec_size < (sizeof hdr - sizeof hdr.rec_size)) {
|
|
|
|
/* The record is shorter than a record header. */
|
|
|
|
*err = WTAP_ERR_BAD_RECORD;
|
|
|
|
*err_info = g_strdup_printf("aethra: File has %u-byte record, less than minimum of %u",
|
|
|
|
rec_size, (unsigned int)(sizeof hdr - sizeof hdr.rec_size));
|
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
|
|
|
|
wth->data_offset += sizeof hdr;
|
|
|
|
|
|
|
|
packet_size = rec_size - (sizeof hdr - sizeof hdr.rec_size);
|
|
|
|
if (packet_size != 0) {
|
|
|
|
buffer_assure_space(wth->frame_buffer, packet_size);
|
|
|
|
if (!aethra_read_rec_data(wth->fh, buffer_start_ptr(wth->frame_buffer),
|
|
|
|
packet_size, err, err_info))
|
|
|
|
return FALSE; /* Read error */
|
|
|
|
wth->data_offset += packet_size;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* XXX - need to find start time in file header.
|
|
|
|
*/
|
|
|
|
msecs = pletohl(hdr.timestamp);
|
|
|
|
wth->phdr.ts.secs = msecs / 1000;
|
|
|
|
wth->phdr.ts.nsecs = (msecs % 1000) * 1000000;
|
|
|
|
wth->phdr.caplen = packet_size;
|
|
|
|
wth->phdr.len = packet_size;
|
|
|
|
|
|
|
|
return TRUE;
|
|
|
|
}
|
|
|
|
|
|
|
|
static gboolean
|
|
|
|
aethra_seek_read(wtap *wth, gint64 seek_off,
|
|
|
|
union wtap_pseudo_header *pseudo_header, guint8 *pd, int length,
|
|
|
|
int *err, gchar **err_info)
|
|
|
|
{
|
|
|
|
struct aethrarec_hdr hdr;
|
|
|
|
|
|
|
|
if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
|
|
|
|
return FALSE;
|
|
|
|
|
|
|
|
if (!aethra_read_rec_header(wth->random_fh, &hdr, pseudo_header, err, err_info))
|
|
|
|
return FALSE;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Read the packet data.
|
|
|
|
*/
|
|
|
|
if (!aethra_read_rec_data(wth->random_fh, pd, length, err, err_info))
|
|
|
|
return FALSE; /* failed */
|
|
|
|
|
|
|
|
return TRUE;
|
|
|
|
}
|
|
|
|
|
|
|
|
static gboolean
|
|
|
|
aethra_read_rec_header(FILE_T fh, struct aethrarec_hdr *hdr,
|
|
|
|
union wtap_pseudo_header *pseudo_header, int *err, gchar **err_info)
|
|
|
|
{
|
|
|
|
int bytes_read;
|
|
|
|
|
|
|
|
/* Read record header. */
|
|
|
|
errno = WTAP_ERR_CANT_READ;
|
|
|
|
bytes_read = file_read(hdr, sizeof hdr, fh);
|
|
|
|
if (bytes_read != sizeof *hdr) {
|
|
|
|
*err = file_error(fh, err_info);
|
|
|
|
if (*err == 0 && bytes_read != 0)
|
|
|
|
*err = WTAP_ERR_SHORT_READ;
|
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
|
|
|
|
pseudo_header->isdn.uton = hdr->flags & AETHRA_U_TO_N;
|
|
|
|
pseudo_header->isdn.channel = 0; /* XXX - D channel */
|
|
|
|
|
|
|
|
return TRUE;
|
|
|
|
}
|
|
|
|
|
|
|
|
static gboolean
|
|
|
|
aethra_read_rec_data(FILE_T fh, guint8 *pd, int length, int *err,
|
|
|
|
gchar **err_info)
|
|
|
|
{
|
|
|
|
int bytes_read;
|
|
|
|
|
|
|
|
errno = WTAP_ERR_CANT_READ;
|
|
|
|
bytes_read = file_read(pd, length, fh);
|
|
|
|
|
|
|
|
if (bytes_read != length) {
|
|
|
|
*err = file_error(fh, err_info);
|
|
|
|
if (*err == 0)
|
|
|
|
*err = WTAP_ERR_SHORT_READ;
|
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
return TRUE;
|
|
|
|
}
|