2013-07-28 23:41:18 +00:00
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/* stanag4607.c
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*
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* STANAG 4607 file reading
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*
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2013-07-29 00:34:23 +00:00
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* http://www.nato.int/structur/AC/224/standard/4607/4607e_JAS_ED3.pdf
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*
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2013-07-28 23:41:18 +00:00
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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2013-07-28 23:58:30 +00:00
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#include <glib.h>
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2013-07-28 23:41:18 +00:00
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#include <errno.h>
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#include "wtap-int.h"
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#include "file_wrappers.h"
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2014-07-15 23:40:46 +00:00
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#include <wsutil/buffer.h>
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2013-07-28 23:41:18 +00:00
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#include "stanag4607.h"
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2013-07-29 00:54:33 +00:00
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typedef struct {
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time_t base_secs;
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} stanag4607_t;
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2013-07-28 23:41:18 +00:00
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static gboolean is_valid_id(guint16 version_id)
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{
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#define VERSION_21 0x3231
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#define VERSION_30 0x3330
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if ((version_id != VERSION_21) &&
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(version_id != VERSION_30))
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/* Not a stanag4607 file */
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return FALSE;
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return TRUE;
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}
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2014-05-23 10:50:02 +00:00
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static gboolean stanag4607_read_file(wtap *wth, FILE_T fh, struct wtap_pkthdr *phdr,
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Buffer *buf, int *err, gchar **err_info)
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2013-07-28 23:41:18 +00:00
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{
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2014-05-09 05:18:49 +00:00
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stanag4607_t *stanag4607 = (stanag4607_t *)wth->priv;
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2013-07-28 23:41:18 +00:00
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guint32 millisecs, secs, nsecs;
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gint64 offset = 0;
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guint8 stanag_pkt_hdr[37];
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guint32 packet_size;
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*err = 0;
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/* Combined packet header and segment header */
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Add some higher-level file-read APIs and use them.
Add wtap_read_bytes(), which takes a FILE_T, a pointer, a byte count, an
error number pointer, and an error string pointer as arguments, and that
treats a short read of any sort, including a read that returns 0 bytes,
as a WTAP_ERR_SHORT_READ error, and that returns the error number and
string through its last two arguments.
Add wtap_read_bytes_or_eof(), which is similar, but that treats a read
that returns 0 bytes as an EOF, supplying an error number of 0 as an EOF
indication.
Use those in file readers; that simplifies the code and makes it less
likely that somebody will fail to supply the error number and error
string on a file read error.
Change-Id: Ia5dba2a6f81151e87b614461349d611cffc16210
Reviewed-on: https://code.wireshark.org/review/4512
Reviewed-by: Guy Harris <guy@alum.mit.edu>
2014-10-07 01:00:57 +00:00
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if (!wtap_read_bytes_or_eof(fh, stanag_pkt_hdr, sizeof stanag_pkt_hdr, err, err_info))
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return FALSE;
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offset += sizeof stanag_pkt_hdr;
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2013-07-28 23:41:18 +00:00
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2013-12-03 20:35:50 +00:00
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if (!is_valid_id(pntoh16(&stanag_pkt_hdr[0]))) {
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2013-07-28 23:41:18 +00:00
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("Bad version number");
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2014-05-23 10:50:02 +00:00
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return FALSE;
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2013-07-28 23:41:18 +00:00
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}
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2014-05-24 18:28:30 +00:00
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phdr->rec_type = REC_TYPE_PACKET;
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2013-07-28 23:41:18 +00:00
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/* The next 4 bytes are the packet length */
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2013-12-03 20:35:50 +00:00
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packet_size = pntoh32(&stanag_pkt_hdr[2]);
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2013-07-28 23:41:18 +00:00
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phdr->caplen = packet_size;
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phdr->len = packet_size;
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/* Sadly, the header doesn't contain times; but some segments do */
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2013-07-29 00:34:23 +00:00
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/* So, get the segment header, which is just past the 32-byte header. */
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2013-07-28 23:41:18 +00:00
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phdr->presence_flags = WTAP_HAS_TS;
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2013-07-29 00:34:23 +00:00
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/* If no time specified, it's the last baseline time */
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2013-07-29 00:54:33 +00:00
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phdr->ts.secs = stanag4607->base_secs;
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2013-07-28 23:41:18 +00:00
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phdr->ts.nsecs = 0;
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millisecs = 0;
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#define MISSION_SEGMENT 1
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#define DWELL_SEGMENT 2
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#define JOB_DEFINITION_SEGMENT 5
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#define PLATFORM_LOCATION_SEGMENT 13
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if (MISSION_SEGMENT == stanag_pkt_hdr[32]) {
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guint8 mseg[39];
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struct tm tm;
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Add some higher-level file-read APIs and use them.
Add wtap_read_bytes(), which takes a FILE_T, a pointer, a byte count, an
error number pointer, and an error string pointer as arguments, and that
treats a short read of any sort, including a read that returns 0 bytes,
as a WTAP_ERR_SHORT_READ error, and that returns the error number and
string through its last two arguments.
Add wtap_read_bytes_or_eof(), which is similar, but that treats a read
that returns 0 bytes as an EOF, supplying an error number of 0 as an EOF
indication.
Use those in file readers; that simplifies the code and makes it less
likely that somebody will fail to supply the error number and error
string on a file read error.
Change-Id: Ia5dba2a6f81151e87b614461349d611cffc16210
Reviewed-on: https://code.wireshark.org/review/4512
Reviewed-by: Guy Harris <guy@alum.mit.edu>
2014-10-07 01:00:57 +00:00
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if (!wtap_read_bytes(fh, &mseg, sizeof mseg, err, err_info))
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return FALSE;
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offset += sizeof mseg;
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2013-07-28 23:41:18 +00:00
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2013-12-03 20:35:50 +00:00
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tm.tm_year = pntoh16(&mseg[35]) - 1900;
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2013-07-28 23:41:18 +00:00
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tm.tm_mon = mseg[37] - 1;
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tm.tm_mday = mseg[38];
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tm.tm_hour = 0;
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tm.tm_min = 0;
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tm.tm_sec = 0;
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tm.tm_isdst = -1;
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2013-07-29 00:54:33 +00:00
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stanag4607->base_secs = mktime(&tm);
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phdr->ts.secs = stanag4607->base_secs;
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2013-07-28 23:41:18 +00:00
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}
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else if (PLATFORM_LOCATION_SEGMENT == stanag_pkt_hdr[32]) {
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Add some higher-level file-read APIs and use them.
Add wtap_read_bytes(), which takes a FILE_T, a pointer, a byte count, an
error number pointer, and an error string pointer as arguments, and that
treats a short read of any sort, including a read that returns 0 bytes,
as a WTAP_ERR_SHORT_READ error, and that returns the error number and
string through its last two arguments.
Add wtap_read_bytes_or_eof(), which is similar, but that treats a read
that returns 0 bytes as an EOF, supplying an error number of 0 as an EOF
indication.
Use those in file readers; that simplifies the code and makes it less
likely that somebody will fail to supply the error number and error
string on a file read error.
Change-Id: Ia5dba2a6f81151e87b614461349d611cffc16210
Reviewed-on: https://code.wireshark.org/review/4512
Reviewed-by: Guy Harris <guy@alum.mit.edu>
2014-10-07 01:00:57 +00:00
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if (!wtap_read_bytes(fh, &millisecs, sizeof millisecs, err, err_info))
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return FALSE;
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offset += sizeof millisecs;
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2013-07-28 23:58:30 +00:00
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millisecs = g_ntohl(millisecs);
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2013-07-28 23:41:18 +00:00
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}
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else if (DWELL_SEGMENT == stanag_pkt_hdr[32]) {
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guint8 dseg[19];
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Add some higher-level file-read APIs and use them.
Add wtap_read_bytes(), which takes a FILE_T, a pointer, a byte count, an
error number pointer, and an error string pointer as arguments, and that
treats a short read of any sort, including a read that returns 0 bytes,
as a WTAP_ERR_SHORT_READ error, and that returns the error number and
string through its last two arguments.
Add wtap_read_bytes_or_eof(), which is similar, but that treats a read
that returns 0 bytes as an EOF, supplying an error number of 0 as an EOF
indication.
Use those in file readers; that simplifies the code and makes it less
likely that somebody will fail to supply the error number and error
string on a file read error.
Change-Id: Ia5dba2a6f81151e87b614461349d611cffc16210
Reviewed-on: https://code.wireshark.org/review/4512
Reviewed-by: Guy Harris <guy@alum.mit.edu>
2014-10-07 01:00:57 +00:00
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if (!wtap_read_bytes(fh, &dseg, sizeof dseg, err, err_info))
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return FALSE;
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offset += sizeof dseg;
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2013-12-03 20:35:50 +00:00
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millisecs = pntoh32(&dseg[15]);
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2013-07-28 23:41:18 +00:00
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}
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if (0 != millisecs) {
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secs = millisecs/1000;
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nsecs = (millisecs - 1000 * secs) * 1000000;
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2013-07-29 00:54:33 +00:00
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phdr->ts.secs = stanag4607->base_secs + secs;
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2013-07-28 23:41:18 +00:00
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phdr->ts.nsecs = nsecs;
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}
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/* wind back to the start of the packet ... */
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if (file_seek(fh, - offset, SEEK_CUR, err) == -1)
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2014-05-23 18:10:05 +00:00
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return FALSE;
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2013-07-28 23:41:18 +00:00
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2014-05-23 10:50:02 +00:00
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return wtap_read_packet_bytes(fh, buf, packet_size, err, err_info);
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2013-07-28 23:41:18 +00:00
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}
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2014-05-23 10:50:02 +00:00
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static gboolean stanag4607_read(wtap *wth, int *err, gchar **err_info, gint64 *data_offset)
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2013-07-28 23:41:18 +00:00
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{
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gint64 offset;
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*err = 0;
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2014-05-09 05:18:49 +00:00
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offset = file_tell(wth->fh);
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2013-07-28 23:41:18 +00:00
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*data_offset = offset;
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2014-05-09 05:18:49 +00:00
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return stanag4607_read_file(wth, wth->fh, &wth->phdr, wth->frame_buffer, err, err_info);
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2013-07-28 23:41:18 +00:00
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}
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2014-05-23 10:50:02 +00:00
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static gboolean stanag4607_seek_read(wtap *wth, gint64 seek_off,
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struct wtap_pkthdr *phdr,
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Buffer *buf, int *err, gchar **err_info)
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2013-07-28 23:41:18 +00:00
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{
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2014-05-09 05:18:49 +00:00
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if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
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2014-05-23 10:50:02 +00:00
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return FALSE;
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2013-07-28 23:41:18 +00:00
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2014-05-09 05:18:49 +00:00
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return stanag4607_read_file(wth, wth->random_fh, phdr, buf, err, err_info);
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2013-07-28 23:41:18 +00:00
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}
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2014-10-09 23:44:15 +00:00
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wtap_open_return_val stanag4607_open(wtap *wth, int *err, gchar **err_info)
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2013-07-28 23:41:18 +00:00
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{
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guint16 version_id;
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2013-07-29 00:54:33 +00:00
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stanag4607_t *stanag4607;
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2013-07-28 23:41:18 +00:00
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Add some higher-level file-read APIs and use them.
Add wtap_read_bytes(), which takes a FILE_T, a pointer, a byte count, an
error number pointer, and an error string pointer as arguments, and that
treats a short read of any sort, including a read that returns 0 bytes,
as a WTAP_ERR_SHORT_READ error, and that returns the error number and
string through its last two arguments.
Add wtap_read_bytes_or_eof(), which is similar, but that treats a read
that returns 0 bytes as an EOF, supplying an error number of 0 as an EOF
indication.
Use those in file readers; that simplifies the code and makes it less
likely that somebody will fail to supply the error number and error
string on a file read error.
Change-Id: Ia5dba2a6f81151e87b614461349d611cffc16210
Reviewed-on: https://code.wireshark.org/review/4512
Reviewed-by: Guy Harris <guy@alum.mit.edu>
2014-10-07 01:00:57 +00:00
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if (!wtap_read_bytes(wth->fh, &version_id, sizeof version_id, err, err_info))
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2014-10-09 23:44:15 +00:00
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return (*err != WTAP_ERR_SHORT_READ) ? WTAP_OPEN_ERROR : WTAP_OPEN_NOT_MINE;
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2013-07-28 23:41:18 +00:00
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if (!is_valid_id(GUINT16_TO_BE(version_id)))
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/* Not a stanag4607 file */
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2014-10-09 23:44:15 +00:00
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return WTAP_OPEN_NOT_MINE;
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2013-07-28 23:41:18 +00:00
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/* seek back to the start of the file */
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2014-05-09 05:18:49 +00:00
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if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
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2014-10-09 23:44:15 +00:00
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return WTAP_OPEN_ERROR;
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2013-07-28 23:41:18 +00:00
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2014-05-09 05:18:49 +00:00
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wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_STANAG_4607;
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wth->file_encap = WTAP_ENCAP_STANAG_4607;
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wth->snapshot_length = 0; /* not known */
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2013-07-28 23:41:18 +00:00
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2013-07-29 00:54:33 +00:00
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stanag4607 = (stanag4607_t *)g_malloc(sizeof(stanag4607_t));
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2014-05-09 05:18:49 +00:00
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wth->priv = (void *)stanag4607;
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2013-07-29 00:54:33 +00:00
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stanag4607->base_secs = 0; /* unknown as of yet */
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2014-05-09 05:18:49 +00:00
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wth->subtype_read = stanag4607_read;
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wth->subtype_seek_read = stanag4607_seek_read;
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2014-09-28 18:37:06 +00:00
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wth->file_tsprec = WTAP_TSPREC_MSEC;
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2013-07-28 23:41:18 +00:00
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2014-10-09 23:44:15 +00:00
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return WTAP_OPEN_MINE;
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2013-07-28 23:41:18 +00:00
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}
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