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/* tap-iax2-analysis.c
* IAX2 analysis addition for Wireshark
*
* based on rtp_analysis.c
* Copyright 2003, Alcatel Business Systems
* By Lars Ruoff <lars.ruoff@gmx.net>
*
* based on tap_rtp.c
* Copyright 2003, Iskratel, Ltd, Kranj
* By Miha Jemec <m.jemec@iskratel.si>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <math.h>
#include <glib.h>
#include <epan/dissectors/packet-iax2.h>
#include "tap-iax2-analysis.h"
/****************************************************************************/
/* This comes from tap-rtp-common.c */
/****************************************************************************/
void
iax2_packet_analyse(tap_iax2_stat_t *statinfo,
packet_info *pinfo,
const struct _iax2_info_t *iax2info)
{
double current_time;
double current_jitter;
double current_diff;
statinfo->flags = 0;
/* check payload type */
if (iax2info->ftype == AST_FRAME_VOICE) {
if (iax2info->csub != statinfo->pt) {
statinfo->flags |= STAT_FLAG_PT_CHANGE;
}
statinfo->pt = iax2info->csub;
}
/* store the current time and calculate the current jitter */
current_time = nstime_to_sec(&pinfo->rel_ts);
current_diff = fabs (current_time - statinfo->time - (((double)iax2info->timestamp - (double)statinfo->timestamp)/1000));
current_jitter = statinfo->jitter + ( current_diff - statinfo->jitter)/16;
statinfo->delta = current_time - (statinfo->time);
statinfo->jitter = current_jitter;
statinfo->diff = current_diff;
/* calculate the BW in Kbps adding the IP+IAX2 header to the RTP -> 20bytes(IP)+ 4bytes(Mini) = 24bytes */
statinfo->bw_history[statinfo->bw_index].bytes = iax2info->payload_len + 24;
statinfo->bw_history[statinfo->bw_index].time = current_time;
/* check if there are more than 1sec in the history buffer to calculate BW in bps. If so, remove those for the calculation */
while ((statinfo->bw_history[statinfo->bw_start_index].time+1) < current_time) {
statinfo->total_bytes -= statinfo->bw_history[statinfo->bw_start_index].bytes;
statinfo->bw_start_index++;
if (statinfo->bw_start_index == BUFF_BW) {
statinfo->bw_start_index = 0;
}
};
statinfo->total_bytes += iax2info->payload_len + 24;
statinfo->bandwidth = (double)(statinfo->total_bytes*8)/1000;
statinfo->bw_index++;
if (statinfo->bw_index == BUFF_BW) {
statinfo->bw_index = 0;
}
/* is this the first packet we got in this direction? */
if (statinfo->first_packet) {
statinfo->start_seq_nr = 0;
statinfo->start_time = current_time;
statinfo->delta = 0;
statinfo->jitter = 0;
statinfo->diff = 0;
statinfo->flags |= STAT_FLAG_FIRST;
statinfo->first_packet = FALSE;
}
/* is it a regular packet? */
if (!(statinfo->flags & STAT_FLAG_FIRST)
&& !(statinfo->flags & STAT_FLAG_MARKER)
&& !(statinfo->flags & STAT_FLAG_PT_CN)
&& !(statinfo->flags & STAT_FLAG_WRONG_TIMESTAMP)
&& !(statinfo->flags & STAT_FLAG_FOLLOW_PT_CN)) {
/* include it in maximum delta calculation */
if (statinfo->delta > statinfo->max_delta) {
statinfo->max_delta = statinfo->delta;
statinfo->max_nr = pinfo->num;
}
/* maximum and mean jitter calculation */
if (statinfo->jitter > statinfo->max_jitter) {
statinfo->max_jitter = statinfo->jitter;
}
statinfo->mean_jitter = (statinfo->mean_jitter*statinfo->total_nr + current_jitter) / (statinfo->total_nr+1);
}
/* regular payload change? (CN ignored) */
if (!(statinfo->flags & STAT_FLAG_FIRST)
&& !(statinfo->flags & STAT_FLAG_PT_CN)) {
if ((statinfo->pt != statinfo->reg_pt)
&& (statinfo->reg_pt != PT_UNDEFINED)) {
statinfo->flags |= STAT_FLAG_REG_PT_CHANGE;
}
}
/* set regular payload*/
if (!(statinfo->flags & STAT_FLAG_PT_CN)) {
statinfo->reg_pt = statinfo->pt;
}
/* TODO: lost packets / duplicated: we should infer this from timestamp... */
statinfo->time = current_time;
statinfo->timestamp = iax2info->timestamp; /* millisecs */
statinfo->stop_seq_nr = 0;
statinfo->total_nr++;
return;
}
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