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/* dpa400.c
*
* Unigraf DisplayPort AUX channel monitor output parser
* Copyright 2018, Dirk Eibach, Guntermann & Drunck GmbH <dirk.eibach@gdsys.cc>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <string.h>
#include "wtap-int.h"
#include "file_wrappers.h"
#include "dpa400.h"
enum {
DPA400_DATA = 0x00,
DPA400_DATA_END = 0x01,
DPA400_EVENT = 0x02,
DPA400_START = 0x03,
DPA400_STOP = 0x04,
DPA400_TS_OVERFLOW = 0x84,
};
struct dpa400_header {
guint8 t0;
guint8 sb0;
guint8 t1;
guint8 sb1;
guint8 t2;
guint8 sb2;
};
static gboolean dpa400_read_header(FILE_T fh, struct dpa400_header *hdr, int *err, gchar **err_info)
{
if (!wtap_read_bytes_or_eof(fh, hdr, sizeof(struct dpa400_header), err, err_info))
return FALSE;
if (hdr->sb0 || hdr->sb1 || hdr->sb2) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup("dpa400: malformed packet header");
return FALSE;
}
return TRUE;
}
static void get_ts(struct dpa400_header *hdr, nstime_t *ts)
{
guint32 val;
val = (hdr->t0 | (hdr->t1 << 8) | ((hdr->t2 & 0x7f) << 16)) << 5;
ts->secs = val / 1000000;
ts->nsecs = (val % 1000000) * 1000;
}
static void get_ts_overflow(nstime_t *ts)
{
guint32 val = 0x7fffff << 5;
ts->secs = val / 1000000;
ts->nsecs = (val % 1000000) * 1000;
}
static guint8 get_from(struct dpa400_header *hdr)
{
return hdr->t2 & 0x80;
}
static gboolean dpa400_read_packet(wtap *wth, FILE_T fh, wtap_rec *rec,
Buffer *buf, int *err, gchar **err_info)
{
guint8 chunk[2];
guint32 ctr = 0;
if (!wth || !rec || !buf)
return FALSE;
if (!wtap_read_bytes_or_eof(fh, chunk, sizeof(chunk), err, err_info))
return FALSE;
if (chunk[1] != 1) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup("dpa400: malformed packet framing");
return FALSE;
}
ws_buffer_clean(buf);
ws_buffer_append(buf, &chunk[0], 1);
ctr++;
switch (chunk[0]) {
case DPA400_STOP: {
struct dpa400_header hdr;
if (!dpa400_read_header(fh, &hdr, err, err_info))
return FALSE;
get_ts(&hdr, &rec->ts);
rec->rec_type = REC_TYPE_PACKET;
rec->presence_flags = WTAP_HAS_TS;
rec->rec_header.packet_header.caplen = rec->rec_header.packet_header.len = 0;
break;
}
case DPA400_START:
case DPA400_EVENT: {
struct dpa400_header hdr;
if (!dpa400_read_header(fh, &hdr, err, err_info))
return FALSE;
get_ts(&hdr, &rec->ts);
if (!wtap_read_bytes_or_eof(fh, chunk, sizeof(chunk), err, err_info))
return FALSE;
if (chunk[1]) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup("dpa400: malformed packet");
return FALSE;
}
ws_buffer_append(buf, &chunk[0], 1);
ctr++;
rec->rec_type = REC_TYPE_PACKET;
rec->presence_flags = WTAP_HAS_TS;
rec->rec_header.packet_header.caplen = rec->rec_header.packet_header.len = ctr;
break;
}
case DPA400_DATA: {
struct dpa400_header hdr;
guint8 from_source;
if (!dpa400_read_header(fh, &hdr, err, err_info))
return FALSE;
get_ts(&hdr, &rec->ts);
from_source = !get_from(&hdr);
ws_buffer_append(buf, &from_source, 1);
ctr++;
while (1) {
if (!wtap_read_bytes_or_eof(fh, chunk, sizeof(chunk), err, err_info))
return FALSE;
if (chunk[1])
break;
if (++ctr > WTAP_MAX_PACKET_SIZE_STANDARD) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("dpa400: File has data record bigger than maximum of %u",
WTAP_MAX_PACKET_SIZE_STANDARD);
return FALSE;
}
ws_buffer_append(buf, &chunk[0], 1);
}
rec->rec_type = REC_TYPE_PACKET;
rec->presence_flags = WTAP_HAS_TS;
rec->rec_header.packet_header.caplen = rec->rec_header.packet_header.len = ctr;
break;
}
case DPA400_TS_OVERFLOW: {
get_ts_overflow(&rec->ts);
rec->rec_type = REC_TYPE_PACKET;
rec->presence_flags = WTAP_HAS_TS;
rec->rec_header.packet_header.caplen = rec->rec_header.packet_header.len = ctr;
break;
}
default:
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("dpa400: unknown packet type %02x", chunk[0]);
return FALSE;
}
return TRUE;
}
static gboolean dpa400_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, SEEK_SET, err) == -1)
return FALSE;
return dpa400_read_packet(wth, wth->random_fh, rec, buf, err, err_info);
}
static gboolean dpa400_read(wtap *wth, int *err, gchar **err_info, gint64 *data_offset)
{
*data_offset = file_tell(wth->fh);
return dpa400_read_packet(wth, wth->fh, &wth->rec, wth->rec_data, err, err_info);
}
wtap_open_return_val dpa400_open(wtap *wth, int *err, gchar **err_info)
{
char magic[4];
const char dpa_magic[] = { 'D', 'B', 'F', 'R' };
/* Read in the number that should be at the start of a "dpa-400" file */
if (!wtap_read_bytes(wth->fh, &magic, sizeof magic, err, err_info)) {
if (*err != WTAP_ERR_SHORT_READ)
return WTAP_OPEN_ERROR;
return WTAP_OPEN_NOT_MINE;
}
if (memcmp(magic, dpa_magic, sizeof(dpa_magic)))
return WTAP_OPEN_NOT_MINE;
wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_DPA400;
wth->file_encap = WTAP_ENCAP_DPAUXMON;
wth->file_tsprec = WTAP_TSPREC_USEC;
wth->subtype_read = dpa400_read;
wth->subtype_seek_read = dpa400_seek_read;
wth->snapshot_length = 0;
return WTAP_OPEN_MINE;
}
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