1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
/* 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
*
* 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 <math.h>
#include <glib.h>
#include <epan/circuit.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_diff) / (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;
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
|
