2 * icmpstat 2011 Christopher Maynard
6 * Wireshark - Network traffic analyzer
7 * By Gerald Combs <gerald@wireshark.org>
8 * Copyright 1998 Gerald Combs
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version 2
13 * of the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 /* This module provides icmp echo request/reply SRT statistics to tshark.
26 * It is only used by tshark and not wireshark
28 * It was based on tap-rpcstat.c and doc/README.tapping.
37 #ifdef HAVE_SYS_TYPES_H
38 # include <sys/types.h>
42 #include "epan/packet_info.h"
44 #include <epan/stat_cmd_args.h>
45 #include <epan/dissectors/packet-icmp.h>
48 /* used to keep track of the ICMP statistics */
49 typedef struct _icmpstat_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 icmpstat_reset(void *tapdata)
74 icmpstat_t *icmpstat = tapdata;
76 g_slist_free(icmpstat->rt_list);
77 icmpstat->rt_list = NULL;
78 icmpstat->num_rqsts = 0;
79 icmpstat->num_resps = 0;
80 icmpstat->min_msecs = 1.0 * G_MAXUINT;
81 icmpstat->max_msecs = 0.0;
82 icmpstat->tot_msecs = 0.0;
86 /* This callback is invoked whenever the tap system has seen a packet we might
87 * be interested in. The function is to be used to only update internal state
88 * information in the *tapdata structure, and if there were state changes which
89 * requires the window to be redrawn, return 1 and (*draw) will be called
92 * This function should be as lightweight as possible since it executes
93 * together with the normal wireshark dissectors. Try to push as much
94 * processing as possible into (*draw) instead since that function executes
95 * asynchronously and does not affect the main thread's performance.
97 * If it is possible, try to do all "filtering" explicitly since you will get
98 * MUCH better performance than applying a similar display-filter in the
101 * The third parameter is tap dependent. Since we register this one to the
102 * "icmp" tap, the third parameter type is icmp_transaction_t.
105 * 0: no updates, no need to call (*draw) later
106 * !0: state has changed, call (*draw) sometime later
109 icmpstat_packet(void *tapdata, packet_info *pinfo _U_, epan_dissect_t *edt _U_, const void *data)
111 icmpstat_t *icmpstat = tapdata;
112 const icmp_transaction_t *trans = data;
118 if (trans->resp_frame) {
119 rt = g_malloc(sizeof(double));
122 *rt = trans->resp_time;
123 icmpstat->rt_list = g_slist_prepend(icmpstat->rt_list, rt);
124 icmpstat->num_resps++;
125 if (icmpstat->min_msecs > trans->resp_time)
126 icmpstat->min_msecs = trans->resp_time;
127 if (icmpstat->max_msecs < trans->resp_time)
128 icmpstat->max_msecs = trans->resp_time;
129 icmpstat->tot_msecs += trans->resp_time;
130 } else if (trans->rqst_frame)
131 icmpstat->num_rqsts++;
139 static double compute_sdev(double average, guint num, GSList *slist)
147 for ( sq_diff_sum = 0.0; slist; slist = g_slist_next(slist)) {
148 diff = *(double *)slist->data - average;
149 sq_diff_sum += diff * diff;
152 return sqrt(sq_diff_sum / num);
156 /* This callback is used when tshark wants us to draw/update our data to the
157 * output device. Since this is tshark, the only output is stdout.
158 * TShark will only call this callback once, which is when tshark has finished
159 * reading all packets and exits.
160 * If used with wireshark this may be called any time, perhaps once every 3
162 * This function may even be called in parallel with (*reset) or (*draw), so
163 * make sure there are no races. The data in the icmpstat_t can thus change
164 * beneath us. Beware!
166 * How best to display the data? For now, following other tap statistics
167 * output, but here are a few other alternatives we might choose from:
169 * -> Windows ping output:
170 * Ping statistics for <IP>:
171 * Packets: Sent = <S>, Received = <R>, Lost = <L> (<LP>% loss),
172 * Approximate round trip times in milli-seconds:
173 * Minimum = <m>ms, Maximum = <M>ms, Average = <A>ms
175 * -> Cygwin ping output:
176 * ----<HOST> PING Statistics----
177 * <S> packets transmitted, <R> packets received, <LP>% packet loss
178 * round-trip (ms) min/avg/max/med = <m>/<M>/<A>/<D>
180 * -> Linux ping output:
181 * --- <HOST> ping statistics ---
182 * <S> packets transmitted, <R> received, <LP>% packet loss, time <T>ms
183 * rtt min/avg/max/mdev = <m>/<A>/<M>/<D> ms
186 icmpstat_draw(void *tapdata)
188 icmpstat_t *icmpstat = tapdata;
190 double average, sdev;
193 printf("==========================================================================\n");
194 printf("ICMP SRT Statistics (all times in ms):\n");
195 printf("Filter: %s\n", icmpstat->filter ? icmpstat->filter : "");
196 printf("Requests Replies Lost %% Loss Min SRT Max SRT Avg SRT SDEV\n");
198 if (icmpstat->num_rqsts) {
199 lost = icmpstat->num_rqsts - icmpstat->num_resps;
200 average = icmpstat->tot_msecs / icmpstat->num_resps;
201 sdev = compute_sdev(average, icmpstat->num_resps, icmpstat->rt_list);
202 printf("%-10u%-10u%-10u%5.1f%% %-10.3f%-10.3f%-10.3f%-10.3f\n",
203 icmpstat->num_rqsts, icmpstat->num_resps, lost,
204 100.0 * lost / icmpstat->num_rqsts,
205 icmpstat->min_msecs >= G_MAXUINT ? 0.0 : icmpstat->min_msecs,
206 icmpstat->max_msecs, average, sdev);
208 printf("0 0 0 0.0%% 0.000 0.000 0.000 0.000\n");
209 printf("==========================================================================\n");
213 /* When called, this function will create a new instance of icmpstat.
215 * This function is called from tshark when it parses the -z icmp, arguments
216 * and it creates a new instance to store statistics in and registers this new
217 * instance for the icmp tap.
220 icmpstat_init(const char *optarg, void* userdata _U_)
222 icmpstat_t *icmpstat;
223 const char *filter = NULL;
224 GString *error_string;
226 if (strstr(optarg, "icmp,srt,"))
227 filter = optarg + strlen("icmp,srt,");
229 icmpstat = g_malloc0(sizeof(icmpstat_t));
230 icmpstat->min_msecs = 1.0 * G_MAXUINT;
231 if (icmpstat == NULL) {
232 fprintf(stderr, "tshark: g_malloc() fatal error.\n");
236 icmpstat->filter = g_strdup(filter);
238 /* It is possible to create a filter and attach it to the callbacks. Then the
239 * callbacks would only be invoked if the filter matched.
241 * Evaluating filters is expensive and if we can avoid it and not use them,
242 * then we gain performance.
244 * In this case we do the filtering for protocol and version inside the
245 * callback itself but use whatever filter the user provided.
248 error_string = register_tap_listener("icmp", icmpstat, icmpstat->filter,
249 TL_REQUIRES_NOTHING, icmpstat_reset, icmpstat_packet, icmpstat_draw);
251 /* error, we failed to attach to the tap. clean up */
252 if (icmpstat->filter)
253 g_free(icmpstat->filter);
256 fprintf(stderr, "tshark: Couldn't register icmp,srt tap: %s\n",
258 g_string_free(error_string, TRUE);
265 register_tap_listener_icmpstat(void)
267 register_stat_cmd_arg("icmp,srt", icmpstat_init, NULL);