forked from osmocom/wireshark
9d41c658fe
wtap_seek_read(). svn path=/trunk/; revision=54570
204 lines
5.5 KiB
C
204 lines
5.5 KiB
C
/* stanag4607.c
|
|
*
|
|
* STANAG 4607 file reading
|
|
*
|
|
* http://www.nato.int/structur/AC/224/standard/4607/4607e_JAS_ED3.pdf
|
|
*
|
|
* $Id$
|
|
*
|
|
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <glib.h>
|
|
#include <errno.h>
|
|
|
|
#ifdef HAVE_SYS_STAT_H
|
|
#include <sys/stat.h>
|
|
#endif
|
|
|
|
#include "wtap-int.h"
|
|
#include "file_wrappers.h"
|
|
#include "buffer.h"
|
|
#include "stanag4607.h"
|
|
|
|
typedef struct {
|
|
time_t base_secs;
|
|
} stanag4607_t;
|
|
|
|
static gboolean is_valid_id(guint16 version_id)
|
|
{
|
|
#define VERSION_21 0x3231
|
|
#define VERSION_30 0x3330
|
|
if ((version_id != VERSION_21) &&
|
|
(version_id != VERSION_30))
|
|
/* Not a stanag4607 file */
|
|
return FALSE;
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean stanag4607_read_file(wtap *wth, FILE_T fh, struct wtap_pkthdr *phdr,
|
|
Buffer *buf, int *err, gchar **err_info)
|
|
{
|
|
stanag4607_t *stanag4607 = (stanag4607_t *)wth->priv;
|
|
guint32 millisecs, secs, nsecs;
|
|
gint64 offset = 0;
|
|
guint8 stanag_pkt_hdr[37];
|
|
int bytes_read;
|
|
guint32 packet_size;
|
|
|
|
*err = 0;
|
|
|
|
/* Combined packet header and segment header */
|
|
bytes_read = file_read(stanag_pkt_hdr, sizeof stanag_pkt_hdr, fh);
|
|
if (bytes_read != sizeof stanag_pkt_hdr)
|
|
goto fail;
|
|
offset += bytes_read;
|
|
|
|
if (!is_valid_id(pntoh16(&stanag_pkt_hdr[0]))) {
|
|
*err = WTAP_ERR_BAD_FILE;
|
|
*err_info = g_strdup("Bad version number");
|
|
return FALSE;
|
|
}
|
|
|
|
/* The next 4 bytes are the packet length */
|
|
packet_size = pntoh32(&stanag_pkt_hdr[2]);
|
|
phdr->caplen = packet_size;
|
|
phdr->len = packet_size;
|
|
|
|
/* Sadly, the header doesn't contain times; but some segments do */
|
|
/* So, get the segment header, which is just past the 32-byte header. */
|
|
phdr->presence_flags = WTAP_HAS_TS;
|
|
|
|
/* If no time specified, it's the last baseline time */
|
|
phdr->ts.secs = stanag4607->base_secs;
|
|
phdr->ts.nsecs = 0;
|
|
millisecs = 0;
|
|
|
|
#define MISSION_SEGMENT 1
|
|
#define DWELL_SEGMENT 2
|
|
#define JOB_DEFINITION_SEGMENT 5
|
|
#define PLATFORM_LOCATION_SEGMENT 13
|
|
if (MISSION_SEGMENT == stanag_pkt_hdr[32]) {
|
|
guint8 mseg[39];
|
|
struct tm tm;
|
|
|
|
bytes_read = file_read(&mseg, sizeof mseg, fh);
|
|
if (bytes_read != sizeof mseg)
|
|
goto fail;
|
|
offset += bytes_read;
|
|
|
|
tm.tm_year = pntoh16(&mseg[35]) - 1900;
|
|
tm.tm_mon = mseg[37] - 1;
|
|
tm.tm_mday = mseg[38];
|
|
tm.tm_hour = 0;
|
|
tm.tm_min = 0;
|
|
tm.tm_sec = 0;
|
|
tm.tm_isdst = -1;
|
|
stanag4607->base_secs = mktime(&tm);
|
|
phdr->ts.secs = stanag4607->base_secs;
|
|
}
|
|
else if (PLATFORM_LOCATION_SEGMENT == stanag_pkt_hdr[32]) {
|
|
bytes_read = file_read(&millisecs, sizeof millisecs, fh);
|
|
if (bytes_read != sizeof millisecs)
|
|
goto fail;
|
|
offset += bytes_read;
|
|
millisecs = g_ntohl(millisecs);
|
|
}
|
|
else if (DWELL_SEGMENT == stanag_pkt_hdr[32]) {
|
|
guint8 dseg[19];
|
|
bytes_read = file_read(&dseg, sizeof dseg, fh);
|
|
if (bytes_read != sizeof dseg)
|
|
goto fail;
|
|
offset += bytes_read;
|
|
millisecs = pntoh32(&dseg[15]);
|
|
}
|
|
if (0 != millisecs) {
|
|
secs = millisecs/1000;
|
|
nsecs = (millisecs - 1000 * secs) * 1000000;
|
|
phdr->ts.secs = stanag4607->base_secs + secs;
|
|
phdr->ts.nsecs = nsecs;
|
|
}
|
|
|
|
/* wind back to the start of the packet ... */
|
|
if (file_seek(fh, - offset, SEEK_CUR, err) == -1)
|
|
goto fail;
|
|
|
|
return wtap_read_packet_bytes(fh, buf, packet_size, err, err_info);
|
|
|
|
fail:
|
|
*err = file_error(wth->fh, err_info);
|
|
return FALSE;
|
|
}
|
|
|
|
static gboolean stanag4607_read(wtap *wth, int *err, gchar **err_info, gint64 *data_offset)
|
|
{
|
|
gint64 offset;
|
|
|
|
*err = 0;
|
|
|
|
offset = file_tell(wth->fh);
|
|
|
|
*data_offset = offset;
|
|
|
|
return stanag4607_read_file(wth, wth->fh, &wth->phdr, wth->frame_buffer, err, err_info);
|
|
}
|
|
|
|
static gboolean stanag4607_seek_read(wtap *wth, gint64 seek_off,
|
|
struct wtap_pkthdr *phdr,
|
|
Buffer *buf, int *err, gchar **err_info)
|
|
{
|
|
if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
|
|
return FALSE;
|
|
|
|
return stanag4607_read_file(wth, wth->random_fh, phdr, buf, err, err_info);
|
|
}
|
|
|
|
int stanag4607_open(wtap *wth, int *err, gchar **err_info)
|
|
{
|
|
int bytes_read;
|
|
guint16 version_id;
|
|
stanag4607_t *stanag4607;
|
|
|
|
bytes_read = file_read(&version_id, sizeof version_id, wth->fh);
|
|
if (bytes_read != sizeof version_id) {
|
|
*err = file_error(wth->fh, err_info);
|
|
return (*err != 0) ? -1 : 0;
|
|
}
|
|
|
|
if (!is_valid_id(GUINT16_TO_BE(version_id)))
|
|
/* Not a stanag4607 file */
|
|
return 0;
|
|
|
|
/* seek back to the start of the file */
|
|
if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
|
|
return -1;
|
|
|
|
wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_STANAG_4607;
|
|
wth->file_encap = WTAP_ENCAP_STANAG_4607;
|
|
wth->snapshot_length = 0; /* not known */
|
|
|
|
stanag4607 = (stanag4607_t *)g_malloc(sizeof(stanag4607_t));
|
|
wth->priv = (void *)stanag4607;
|
|
stanag4607->base_secs = 0; /* unknown as of yet */
|
|
|
|
wth->subtype_read = stanag4607_read;
|
|
wth->subtype_seek_read = stanag4607_seek_read;
|
|
wth->tsprecision = WTAP_FILE_TSPREC_MSEC;
|
|
|
|
return 1;
|
|
}
|