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