2 * icmpv6stat 2011 Christopher Maynard
4 * Wireshark - Network traffic analyzer
5 * By Gerald Combs <gerald@wireshark.org>
6 * Copyright 1998 Gerald Combs
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 /* This module provides icmpv6 echo request/reply SRT statistics to tshark.
24 * It is only used by tshark and not wireshark
26 * It was based on tap-icmptat.c, which itself was based on tap-rpcstat.c and
39 #include <epan/packet_info.h>
41 #include <epan/stat_tap_ui.h>
42 #include <epan/dissectors/packet-icmp.h>
44 void register_tap_listener_icmpv6stat(void);
46 /* used to keep track of the ICMPv6 statistics */
47 typedef struct _icmpv6stat_t {
60 /* This callback is never used by tshark but it is here for completeness. When
61 * registering below, we could just have left this function as NULL.
63 * When used by wireshark, this function will be called whenever we would need
64 * to reset all state, such as when wireshark opens a new file, when it starts
65 * a new capture, when it rescans the packetlist after some prefs have changed,
68 * So if your application has some state it needs to clean up in those
69 * situations, here is a good place to put that code.
72 icmpv6stat_reset(void *tapdata)
74 icmpv6stat_t *icmpv6stat = (icmpv6stat_t *)tapdata;
76 g_slist_free(icmpv6stat->rt_list);
77 memset(icmpv6stat, 0, sizeof(icmpv6stat_t));
78 icmpv6stat->min_msecs = 1.0 * G_MAXUINT;
82 static gint compare_doubles(gconstpointer a, gconstpointer b)
86 ad = *(const double *)a;
87 bd = *(const double *)b;
97 /* This callback is invoked whenever the tap system has seen a packet we might
98 * be interested in. The function is to be used to only update internal state
99 * information in the *tapdata structure, and if there were state changes which
100 * requires the window to be redrawn, return 1 and (*draw) will be called
103 * This function should be as lightweight as possible since it executes
104 * together with the normal wireshark dissectors. Try to push as much
105 * processing as possible into (*draw) instead since that function executes
106 * asynchronously and does not affect the main thread's performance.
108 * If it is possible, try to do all "filtering" explicitly since you will get
109 * MUCH better performance than applying a similar display-filter in the
112 * The third parameter is tap dependent. Since we register this one to the
113 * "icmpv6" tap, the third parameter type is icmp_transaction_t.
116 * FALSE: no updates, no need to call (*draw) later
117 * TRUE: state has changed, call (*draw) sometime later
120 icmpv6stat_packet(void *tapdata, packet_info *pinfo _U_, epan_dissect_t *edt _U_, const void *data)
122 icmpv6stat_t *icmpv6stat = (icmpv6stat_t *)tapdata;
123 const icmp_transaction_t *trans = (const icmp_transaction_t *)data;
124 double resp_time, *rt;
129 if (trans->resp_frame) {
130 resp_time = nstime_to_msec(&trans->resp_time);
131 rt = g_new(double, 1);
135 icmpv6stat->rt_list = g_slist_prepend(icmpv6stat->rt_list, rt);
136 icmpv6stat->num_resps++;
137 if (icmpv6stat->min_msecs > resp_time) {
138 icmpv6stat->min_frame = trans->resp_frame;
139 icmpv6stat->min_msecs = resp_time;
141 if (icmpv6stat->max_msecs < resp_time) {
142 icmpv6stat->max_frame = trans->resp_frame;
143 icmpv6stat->max_msecs = resp_time;
145 icmpv6stat->tot_msecs += resp_time;
146 } else if (trans->rqst_frame)
147 icmpv6stat->num_rqsts++;
156 * Compute the mean, median and standard deviation.
158 static void compute_stats(icmpv6stat_t *icmpv6stat, double *mean, double *med, double *sdev)
162 double sq_diff_sum = 0.0;
164 icmpv6stat->rt_list = g_slist_sort(icmpv6stat->rt_list, compare_doubles);
165 slist = icmpv6stat->rt_list;
167 if (icmpv6stat->num_resps == 0 || slist == NULL) {
174 /* (arithmetic) mean */
175 *mean = icmpv6stat->tot_msecs / icmpv6stat->num_resps;
177 /* median: If we have an odd number of elements in our list, then the
178 * median is simply the middle element, otherwise the median is computed by
179 * averaging the 2 elements on either side of the mid-point. */
180 if (icmpv6stat->num_resps & 1)
181 *med = *(double *)g_slist_nth_data(slist, icmpv6stat->num_resps / 2);
184 (*(double *)g_slist_nth_data(slist, (icmpv6stat->num_resps - 1) / 2) +
185 *(double *)g_slist_nth_data(slist, icmpv6stat->num_resps / 2)) / 2;
188 /* (sample) standard deviation */
189 for ( ; slist; slist = g_slist_next(slist)) {
190 diff = *(double *)slist->data - *mean;
191 sq_diff_sum += diff * diff;
193 if (icmpv6stat->num_resps > 1)
194 *sdev = sqrt(sq_diff_sum / (icmpv6stat->num_resps - 1));
200 /* This callback is used when tshark wants us to draw/update our data to the
201 * output device. Since this is tshark, the only output is stdout.
202 * TShark will only call this callback once, which is when tshark has finished
203 * reading all packets and exits.
204 * If used with wireshark this may be called any time, perhaps once every 3
206 * This function may even be called in parallel with (*reset) or (*draw), so
207 * make sure there are no races. The data in the icmpv6stat_t can thus change
208 * beneath us. Beware!
210 * How best to display the data? For now, following other tap statistics
211 * output, but here are a few other alternatives we might choose from:
213 * -> Windows ping output:
214 * Ping statistics for <IP>:
215 * Packets: Sent = <S>, Received = <R>, Lost = <L> (<LP>% loss),
216 * Approximate round trip times in milli-seconds:
217 * Minimum = <m>ms, Maximum = <M>ms, Average = <A>ms
219 * -> Cygwin ping output:
220 * ----<HOST> PING Statistics----
221 * <S> packets transmitted, <R> packets received, <LP>% packet loss
222 * round-trip (ms) min/avg/max/med = <m>/<M>/<A>/<D>
224 * -> Linux ping output:
225 * --- <HOST> ping statistics ---
226 * <S> packets transmitted, <R> received, <LP>% packet loss, time <T>ms
227 * rtt min/avg/max/mdev = <m>/<A>/<M>/<D> ms
230 icmpv6stat_draw(void *tapdata)
232 icmpv6stat_t *icmpv6stat = (icmpv6stat_t *)tapdata;
234 double mean, sdev, med;
237 printf("==========================================================================\n");
238 printf("ICMPv6 Service Response Time (SRT) Statistics (all times in ms):\n");
239 printf("Filter: %s\n", icmpv6stat->filter ? icmpv6stat->filter : "<none>");
240 printf("\nRequests Replies Lost %% Loss\n");
242 if (icmpv6stat->num_rqsts) {
243 lost = icmpv6stat->num_rqsts - icmpv6stat->num_resps;
244 compute_stats(icmpv6stat, &mean, &med, &sdev);
246 printf("%-10u%-10u%-10u%5.1f%%\n\n",
247 icmpv6stat->num_rqsts, icmpv6stat->num_resps, lost,
248 100.0 * lost / icmpv6stat->num_rqsts);
249 printf("Minimum Maximum Mean Median SDeviation Min Frame Max Frame\n");
250 printf("%-10.3f%-10.3f%-10.3f%-10.3f%-10.3f %-10u%-10u\n",
251 icmpv6stat->min_msecs >= G_MAXUINT ? 0.0 : icmpv6stat->min_msecs,
252 icmpv6stat->max_msecs, mean, med, sdev,
253 icmpv6stat->min_frame, icmpv6stat->max_frame);
255 printf("0 0 0 0.0%%\n\n");
256 printf("Minimum Maximum Mean Median SDeviation Min Frame Max Frame\n");
257 printf("0.000 0.000 0.000 0.000 0.000 0 0\n");
259 printf("==========================================================================\n");
263 /* When called, this function will create a new instance of icmpv6stat.
265 * This function is called from tshark when it parses the -z icmpv6, arguments
266 * and it creates a new instance to store statistics in and registers this new
267 * instance for the icmpv6 tap.
270 icmpv6stat_init(const char *opt_arg, void *userdata _U_)
272 icmpv6stat_t *icmpv6stat;
273 const char *filter = NULL;
274 GString *error_string;
276 if (strstr(opt_arg, "icmpv6,srt,"))
277 filter = opt_arg + strlen("icmpv6,srt,");
279 icmpv6stat = (icmpv6stat_t *)g_try_malloc(sizeof(icmpv6stat_t));
280 if (icmpv6stat == NULL) {
281 fprintf(stderr, "tshark: g_try_malloc() fatal error.\n");
284 memset(icmpv6stat, 0, sizeof(icmpv6stat_t));
285 icmpv6stat->min_msecs = 1.0 * G_MAXUINT;
287 icmpv6stat->filter = g_strdup(filter);
289 /* It is possible to create a filter and attach it to the callbacks. Then the
290 * callbacks would only be invoked if the filter matched.
292 * Evaluating filters is expensive and if we can avoid it and not use them,
293 * then we gain performance.
295 * In this case we do the filtering for protocol and version inside the
296 * callback itself but use whatever filter the user provided.
299 error_string = register_tap_listener("icmpv6", icmpv6stat, icmpv6stat->filter,
300 TL_REQUIRES_NOTHING, icmpv6stat_reset, icmpv6stat_packet, icmpv6stat_draw);
302 /* error, we failed to attach to the tap. clean up */
303 g_free(icmpv6stat->filter);
306 fprintf(stderr, "tshark: Couldn't register icmpv6,srt tap: %s\n",
308 g_string_free(error_string, TRUE);
313 static stat_tap_ui icmpv6stat_ui = {
314 REGISTER_STAT_GROUP_GENERIC,
323 register_tap_listener_icmpv6stat(void)
325 register_stat_tap_ui(&icmpv6stat_ui, NULL);
329 * Editor modelines - http://www.wireshark.org/tools/modelines.html
334 * indent-tabs-mode: nil
337 * vi: set shiftwidth=4 tabstop=8 expandtab:
338 * :indentSize=4:tabSize=8:noTabs=true: