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1 office 1 /* tap-iax2-analysis.c
2 * IAX2 analysis addition for Wireshark
3 *
4 * based on rtp_analysis.c
5 * Copyright 2003, Alcatel Business Systems
6 * By Lars Ruoff <lars.ruoff@gmx.net>
7 *
8 * based on tap_rtp.c
9 * Copyright 2003, Iskratel, Ltd, Kranj
10 * By Miha Jemec <m.jemec@iskratel.si>
11 *
12 * Wireshark - Network traffic analyzer
13 * By Gerald Combs <gerald@wireshark.org>
14 * Copyright 1998 Gerald Combs
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * as published by the Free Software Foundation; either version 2
19 * of the License, or (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
29 */
30  
31 #include "config.h"
32  
33 #include <math.h>
34  
35 #include <glib.h>
36  
37 #include <epan/circuit.h>
38  
39 #include <epan/dissectors/packet-iax2.h>
40  
41 #include "tap-iax2-analysis.h"
42  
43 /****************************************************************************/
44 /* This comes from tap-rtp-common.c */
45 /****************************************************************************/
46  
47 void
48 iax2_packet_analyse(tap_iax2_stat_t *statinfo,
49 packet_info *pinfo,
50 const struct _iax2_info_t *iax2info)
51 {
52 double current_time;
53 double current_jitter;
54 double current_diff;
55  
56 statinfo->flags = 0;
57 /* check payload type */
58 if (iax2info->ftype == AST_FRAME_VOICE) {
59 if (iax2info->csub != statinfo->pt)
60 statinfo->flags |= STAT_FLAG_PT_CHANGE;
61 statinfo->pt = iax2info->csub;
62 }
63  
64 /* store the current time and calculate the current jitter */
65 current_time = nstime_to_sec(&pinfo->rel_ts);
66 current_diff = fabs (current_time - statinfo->time - (((double)iax2info->timestamp - (double)statinfo->timestamp)/1000));
67 current_jitter = statinfo->jitter + ( current_diff - statinfo->jitter)/16;
68 statinfo->delta = current_time - (statinfo->time);
69 statinfo->jitter = current_jitter;
70 statinfo->diff = current_diff;
71  
72 /* calculate the BW in Kbps adding the IP+IAX2 header to the RTP -> 20bytes(IP)+ 4bytes(Mini) = 24bytes */
73 statinfo->bw_history[statinfo->bw_index].bytes = iax2info->payload_len + 24;
74 statinfo->bw_history[statinfo->bw_index].time = current_time;
75 /* check if there are more than 1sec in the history buffer to calculate BW in bps. If so, remove those for the calculation */
76 while ((statinfo->bw_history[statinfo->bw_start_index].time+1) < current_time) {
77 statinfo->total_bytes -= statinfo->bw_history[statinfo->bw_start_index].bytes;
78 statinfo->bw_start_index++;
79 if (statinfo->bw_start_index == BUFF_BW) statinfo->bw_start_index = 0;
80 };
81 statinfo->total_bytes += iax2info->payload_len + 24;
82 statinfo->bandwidth = (double)(statinfo->total_bytes*8)/1000;
83 statinfo->bw_index++;
84 if (statinfo->bw_index == BUFF_BW) statinfo->bw_index = 0;
85  
86  
87 /* is this the first packet we got in this direction? */
88 if (statinfo->first_packet) {
89 statinfo->start_seq_nr = 0;
90 statinfo->start_time = current_time;
91 statinfo->delta = 0;
92 statinfo->jitter = 0;
93 statinfo->diff = 0;
94 statinfo->flags |= STAT_FLAG_FIRST;
95 statinfo->first_packet = FALSE;
96 }
97 /* is it a regular packet? */
98 if (!(statinfo->flags & STAT_FLAG_FIRST)
99 && !(statinfo->flags & STAT_FLAG_MARKER)
100 && !(statinfo->flags & STAT_FLAG_PT_CN)
101 && !(statinfo->flags & STAT_FLAG_WRONG_TIMESTAMP)
102 && !(statinfo->flags & STAT_FLAG_FOLLOW_PT_CN)) {
103 /* include it in maximum delta calculation */
104 if (statinfo->delta > statinfo->max_delta) {
105 statinfo->max_delta = statinfo->delta;
106 statinfo->max_nr = pinfo->num;
107 }
108 /* maximum and mean jitter calculation */
109 if (statinfo->jitter > statinfo->max_jitter) {
110 statinfo->max_jitter = statinfo->jitter;
111 }
112 statinfo->mean_jitter = (statinfo->mean_jitter*statinfo->total_nr + current_diff) / (statinfo->total_nr+1);
113 }
114 /* regular payload change? (CN ignored) */
115 if (!(statinfo->flags & STAT_FLAG_FIRST)
116 && !(statinfo->flags & STAT_FLAG_PT_CN)) {
117 if ((statinfo->pt != statinfo->reg_pt)
118 && (statinfo->reg_pt != PT_UNDEFINED)) {
119 statinfo->flags |= STAT_FLAG_REG_PT_CHANGE;
120 }
121 }
122  
123 /* set regular payload*/
124 if (!(statinfo->flags & STAT_FLAG_PT_CN)) {
125 statinfo->reg_pt = statinfo->pt;
126 }
127  
128 /* TODO: lost packets / duplicated: we should infer this from timestamp... */
129 statinfo->time = current_time;
130 statinfo->timestamp = iax2info->timestamp; /* millisecs */
131 statinfo->stop_seq_nr = 0;
132 statinfo->total_nr++;
133  
134 return;
135 }
136  
137 /*
138 * Editor modelines - http://www.wireshark.org/tools/modelines.html
139 *
140 * Local variables:
141 * c-basic-offset: 4
142 * tab-width: 8
143 * indent-tabs-mode: nil
144 * End:
145 *
146 * vi: set shiftwidth=4 tabstop=8 expandtab:
147 * :indentSize=4:tabSize=8:noTabs=true:
148 */