nexmon – Rev 1
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/* tap-comparestat.c
* Compare two capture files
* Copyright 2008 Vincenzo Condoleo, Christophe Dirac, Reto Ruoss
* supported by HSR (Hochschule Rapperswil)
*
* 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.
*/
/* This module provides statistics about two merged capture files, to find packet loss,
* time delay, ip header checksum errors and order check to tshark.
* It's also detecting the matching regions of the different files.
*
* The packets are compared by the ip id. MAC or TTL is used to distinct the different files.
* It is only used by tshark and not wireshark
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <glib.h>
#include <epan/packet_info.h>
#include <epan/in_cksum.h>
#include <epan/packet.h>
#include <epan/tap.h>
#include <epan/stat_tap_ui.h>
#include <epan/dissectors/packet-ip.h>
#include <epan/timestats.h>
/* For checksum */
#define BYTES 8
#define WRONG_CHKSUM 0
#define MERGED_FILES 2
#define TTL_SEARCH 5
void register_tap_listener_comparestat(void);
/* information which will be printed */
typedef struct _for_print {
guint count;
guint16 cksum;
nstime_t predecessor_time;
struct _frame_info *partner;
} for_print;
/* each tracked packet */
typedef struct _frame_info {
for_print *fp;
guint32 num;
guint16 id;
guint8 ip_ttl;
address dl_dst;
nstime_t abs_ts, zebra_time, delta;
} frame_info;
/* used to keep track of the statistics for an entire program interface */
typedef struct _comparestat_t {
char *filter;
GHashTable *packet_set, *ip_id_set, *nr_set;
address eth_dst, eth_src;
nstime_t zebra_time, current_time;
timestat_t stats;
GArray *ip_ttl_list;
gboolean last_hit;
guint32 start_ongoing_hits, stop_ongoing_hits, start_packet_nr_first, start_packet_nr_second, stop_packet_nr_first, stop_packet_nr_second;
guint32 first_file_amount, second_file_amount;
} comparestat_t;
/* to call directly _init */
static gdouble compare_variance = 0.0;
static guint8 compare_start, compare_stop;
static gboolean TTL_method = TRUE, ON_method = TRUE;
/* This callback is never used by tshark but it is here for completeness. */
static void
comparestat_reset(void *dummy _U_)
{
}
/* This callback is invoked whenever the tap system has seen a packet
* we might be interested in.
* function returns :
* 0: no updates, no need to call (*draw) later
* !0: state has changed, call (*draw) sometime later
*/
static int
comparestat_packet(void *arg, packet_info *pinfo, epan_dissect_t *edt _U_, const void *arg2)
{
comparestat_t *cs = (comparestat_t *)arg;
const ws_ip *ci = (const ws_ip *)arg2;
frame_info *fInfo;
vec_t cksum_vec[3];
guint16 computed_cksum = 0;
/* so this get filled, usually with the first frame */
if (cs->eth_dst.len == 0) {
copy_address_shallow(&cs->eth_dst, &pinfo->dl_dst);
copy_address_shallow(&cs->eth_src, &pinfo->dl_src);
}
/* Set up the fields of the pseudo-header and create checksum */
cksum_vec[0].ptr = &ci->ip_v_hl;
cksum_vec[0].len = BYTES;
/* skip TTL */
cksum_vec[1].ptr = &ci->ip_nxt;
cksum_vec[1].len = 1;
/* skip header checksum and ip's (because of NAT)*/
cksum_vec[2].ptr = (const guint8 *)ci->ip_dst.data;
cksum_vec[2].ptr = cksum_vec[2].ptr+ci->ip_dst.len;
/* dynamic computation */
cksum_vec[2].len = ci->ip_len-20;
computed_cksum = in_cksum(&cksum_vec[0], 3);
/* collect all packet infos */
fInfo = (frame_info*)g_malloc(sizeof(frame_info));
fInfo->fp = (for_print*)g_malloc(sizeof(for_print));
fInfo->fp->partner = NULL;
fInfo->fp->count = 1;
fInfo->fp->cksum = computed_cksum;
fInfo->num = pinfo->num;
fInfo->id = ci->ip_id;
fInfo->ip_ttl = ci->ip_ttl;
copy_address_shallow(&fInfo->dl_dst, &pinfo->dl_dst);
fInfo->abs_ts = pinfo->abs_ts;
/* clean memory */
nstime_set_zero(&fInfo->zebra_time);
nstime_set_zero(&fInfo->fp->predecessor_time);
g_hash_table_insert(cs->packet_set, GINT_TO_POINTER(pinfo->num), fInfo);
return 1;
}
static void
frame_info_free(gpointer data)
{
frame_info *fInfo = (frame_info *)data;
g_free(fInfo->fp);
g_free(fInfo);
}
/* Find equal packets, same IP-Id, count them and make time statistics */
static void
call_foreach_count_ip_id(gpointer key _U_, gpointer value, gpointer arg)
{
comparestat_t *cs = (comparestat_t*)arg;
frame_info *fInfo = (frame_info*)value, *fInfoTemp;
nstime_t delta;
guint i;
/* we only need one value out of pinfo we use a temp one */
packet_info *pinfo = (packet_info*)g_malloc(sizeof(packet_info));
pinfo->fd = (frame_data*)g_malloc(sizeof(frame_data));
pinfo->num = fInfo->num;
fInfoTemp = (frame_info *)g_hash_table_lookup(cs->ip_id_set, GINT_TO_POINTER((gint)fInfo->id));
if (fInfoTemp == NULL) {
/* Detect ongoing package loss */
if ((cs->last_hit == FALSE) && (cs->start_ongoing_hits > compare_start) && (cs->stop_ongoing_hits < compare_stop)) {
cs->stop_ongoing_hits++;
cs->stop_packet_nr_first = fInfo->num;
} else if (cs->stop_ongoing_hits < compare_stop) {
cs->stop_ongoing_hits = 0;
cs->stop_packet_nr_first = G_MAXINT32;
}
cs->last_hit = FALSE;
fInfo->fp->count = 1;
g_hash_table_insert(cs->ip_id_set, GINT_TO_POINTER((gint)fInfo->id), fInfo);
} else {
/* Detect ongoing package hits, special behavior if start is set to 0 */
if ((cs->last_hit || (compare_start == 0)) && (cs->start_ongoing_hits < compare_start || (compare_start == 0))) {
if ((compare_start == 0) && (cs->start_ongoing_hits != 0)) {
/* start from the first packet so already set */
} else {
cs->start_ongoing_hits++;
/* Take the lower number */
cs->start_packet_nr_first = fInfoTemp->num;
cs->start_packet_nr_second = fInfo->num;
}
} else if (cs->start_ongoing_hits < compare_start) {
cs->start_ongoing_hits = 0;
cs->start_packet_nr_first = G_MAXINT32;
}
cs->last_hit = TRUE;
fInfo->fp->count = fInfoTemp->fp->count + 1;
if (fInfoTemp->fp->cksum != fInfo->fp->cksum) {
fInfo->fp->cksum = WRONG_CHKSUM;
fInfoTemp->fp->cksum = WRONG_CHKSUM;
}
/* Add partner */
fInfo->fp->partner = fInfoTemp;
/* Create time statistic */
if (fInfo->fp->count == MERGED_FILES) {
nstime_delta(&delta, &fInfo->abs_ts, &fInfoTemp->abs_ts);
/* Set delta in both packets */
nstime_set_zero(&fInfoTemp->delta);
nstime_add(&fInfoTemp->delta, &delta);
nstime_set_zero(&fInfo->delta);
nstime_add(&fInfo->delta, &delta);
time_stat_update(&cs->stats, &delta, pinfo);
}
g_hash_table_insert(cs->ip_id_set, GINT_TO_POINTER((gint)fInfo->id), fInfo);
}
/* collect TTL's */
if (TTL_method && (fInfo->num < TTL_SEARCH)) {
for (i=0; i < cs->ip_ttl_list->len; i++) {
if (g_array_index(cs->ip_ttl_list, guint8, i) == fInfo->ip_ttl) {
return;
}
}
g_array_append_val(cs->ip_ttl_list, fInfo->ip_ttl);
}
g_free(pinfo->fd);
g_free(pinfo);
}
/*Create new numbering */
static void
call_foreach_new_order(gpointer key _U_, gpointer value, gpointer arg)
{
comparestat_t *cs = (comparestat_t*)arg;
frame_info *fInfo = (frame_info*)value, *fInfoTemp;
/* overwrite Info column for new ordering */
fInfoTemp = (frame_info *)g_hash_table_lookup(cs->nr_set, GINT_TO_POINTER((gint)fInfo->id));
if (fInfoTemp == NULL) {
if (TTL_method == FALSE) {
if ((addresses_equal(&cs->eth_dst, &fInfo->dl_dst)) || (addresses_equal(&cs->eth_src, &fInfo->dl_dst))) {
g_hash_table_insert(cs->nr_set, GINT_TO_POINTER((gint)fInfo->id), fInfo);
fInfo->zebra_time = cs->zebra_time;
cs->zebra_time.nsecs = cs->zebra_time.nsecs + MERGED_FILES;
} else {
cs->zebra_time.nsecs++;
g_hash_table_insert(cs->nr_set, GINT_TO_POINTER((gint)fInfo->id), fInfo);
fInfo->zebra_time = cs->zebra_time;
cs->zebra_time.nsecs++;
}
} else {
if ((g_array_index(cs->ip_ttl_list, guint8, 0) == fInfo->ip_ttl) || (g_array_index(cs->ip_ttl_list, guint8, 1) == fInfo->ip_ttl)) {
g_hash_table_insert(cs->nr_set, GINT_TO_POINTER((gint)fInfo->id), fInfo);
fInfo->zebra_time = cs->zebra_time;
cs->zebra_time.nsecs = cs->zebra_time.nsecs + MERGED_FILES;
} else {
cs->zebra_time.nsecs++;
g_hash_table_insert(cs->nr_set, GINT_TO_POINTER((gint)fInfo->id), fInfo);
fInfo->zebra_time = cs->zebra_time;
cs->zebra_time.nsecs++;
}
}
} else {
if (TTL_method == FALSE) {
if (((addresses_equal(&cs->eth_dst, &fInfo->dl_dst)) || (addresses_equal(&cs->eth_src, &fInfo->dl_dst))) && (!fmod(fInfoTemp->zebra_time.nsecs, MERGED_FILES))) {
fInfo->zebra_time.nsecs = fInfoTemp->zebra_time.nsecs;
} else {
fInfo->zebra_time.nsecs = fInfoTemp->zebra_time.nsecs+1;
}
} else {
if (((g_array_index(cs->ip_ttl_list, guint8, 0) == fInfo->ip_ttl) || (g_array_index(cs->ip_ttl_list, guint8, 1) == fInfo->ip_ttl)) && (!fmod(fInfoTemp->zebra_time.nsecs, MERGED_FILES))) {
fInfo->zebra_time.nsecs = fInfoTemp->zebra_time.nsecs;
} else {
fInfo->zebra_time.nsecs = fInfoTemp->zebra_time.nsecs+1;
}
}
}
/* count packets of file */
if (fmod(fInfo->zebra_time.nsecs, MERGED_FILES)) {
cs->first_file_amount++;
} else {
cs->second_file_amount++;
}
/* ordering */
if (!nstime_is_unset(&cs->current_time)) {
fInfo->fp->predecessor_time.nsecs = cs->current_time.nsecs;
}
cs->current_time.nsecs = fInfo->zebra_time.nsecs;
}
/* calculate scopes if not set yet */
static void
call_foreach_merge_settings(gpointer key _U_, gpointer value, gpointer arg)
{
comparestat_t *cs = (comparestat_t*)arg;
frame_info *fInfo = (frame_info*)value, *fInfoTemp = NULL;
guint32 tot_packet_amount = cs->first_file_amount+cs->second_file_amount, swap;
if ((fInfo->num == tot_packet_amount) && (cs->stop_packet_nr_first != G_MAXINT32)) {
/* calculate missing stop number */
swap = cs->stop_packet_nr_first;
cs->stop_packet_nr_first = tot_packet_amount-cs->second_file_amount;
cs->stop_packet_nr_second = swap;
}
if ((fInfo->num == tot_packet_amount) && (cs->stop_packet_nr_first == G_MAXINT32) && (cs->start_packet_nr_first != G_MAXINT32)) {
fInfoTemp = (frame_info *)g_hash_table_lookup(cs->packet_set, GINT_TO_POINTER(cs->start_packet_nr_first));
if (fInfoTemp == NULL) {
printf("ERROR: start number not set correctly\n");
return;
}
if (fmod(fInfoTemp->zebra_time.nsecs, 2)) {
/*first file*/
cs->stop_packet_nr_first = cs->start_packet_nr_first+(cs->second_file_amount-(cs->start_packet_nr_second-cs->first_file_amount));
if (cs->stop_packet_nr_first > (tot_packet_amount-cs->second_file_amount)) {
cs->stop_packet_nr_first = tot_packet_amount-cs->second_file_amount;
}
/*this only happens if we have too many MAC's or TTL*/
if (cs->stop_packet_nr_first > cs->start_packet_nr_second) {
cs->stop_packet_nr_first = cs->start_packet_nr_second-1;
}
fInfoTemp = (frame_info *)g_hash_table_lookup(cs->packet_set, GINT_TO_POINTER(cs->stop_packet_nr_first));
while ((fInfoTemp != NULL) ? fmod(!fInfoTemp->zebra_time.nsecs, 2) : TRUE) {
cs->stop_packet_nr_first--;
fInfoTemp = (frame_info *)g_hash_table_lookup(cs->packet_set, GINT_TO_POINTER(cs->stop_packet_nr_first));
}
} else {
/*this only happens if we have too many MAC's or TTL*/
cs->stop_packet_nr_first = cs->first_file_amount+cs->start_packet_nr_first;
if (cs->stop_packet_nr_first > tot_packet_amount-cs->first_file_amount) {
cs->stop_packet_nr_first = tot_packet_amount-cs->first_file_amount;
}
fInfoTemp = (frame_info *)g_hash_table_lookup(cs->packet_set, GINT_TO_POINTER(cs->stop_packet_nr_first));
while ((fInfoTemp != NULL) ? fmod(fInfoTemp->zebra_time.nsecs, 2) : TRUE) {
cs->stop_packet_nr_first--;
fInfoTemp = (frame_info *)g_hash_table_lookup(cs->packet_set, GINT_TO_POINTER(cs->stop_packet_nr_first));
}
}
/* set second stop location */
cs->stop_packet_nr_second = cs->start_packet_nr_second+(cs->stop_packet_nr_first-cs->start_packet_nr_first);
if (cs->stop_packet_nr_second > tot_packet_amount) {
cs->stop_packet_nr_second = tot_packet_amount;
}
}
/* no start found */
if (fInfo->num == tot_packet_amount && compare_start != 0 && compare_stop != 0) {
if (cs->start_packet_nr_first == G_MAXINT32) {
printf("Start point couldn't be set, choose a lower compare start");
}
}
}
static void
call_foreach_print_ip_tree(gpointer key _U_, gpointer value, gpointer user_data)
{
frame_info *fInfo = (frame_info*)value;
comparestat_t *cs = (comparestat_t*)user_data;
gdouble delta, average;
gboolean show_it = FALSE;
gboolean checksum_error = FALSE;
gboolean not_in_time = FALSE;
gboolean incorrect_order = FALSE;
delta = fabs(get_average(&fInfo->delta, 1));
average = fabs(get_average(&cs->stats.tot, cs->stats.num));
/* special case if both are set to zero ignore start and stop numbering */
if (compare_start != 0 && compare_stop != 0) {
/* check out if packet is in searched scope */
if ((cs->start_packet_nr_first < fInfo->num)&&(cs->stop_packet_nr_first > fInfo->num)) {
show_it = TRUE;
} else {
/* so we won't miss the other file */
if ((fInfo->num > cs->start_packet_nr_second)&&(fInfo->num < cs->stop_packet_nr_second)) {
show_it = TRUE;
}
}
} else {
show_it = TRUE;
}
if (show_it) {
if (fInfo->fp->count < MERGED_FILES) {
printf("Packet ID: %u, Count: %u, Problem: Packet lost\n", fInfo->id, fInfo->fp->count);
}
if (fInfo->fp->count > MERGED_FILES) {
if (fInfo->fp->cksum == WRONG_CHKSUM) {
checksum_error = TRUE;
}
printf("Packet ID: %u, Count: %u, Problem: More than two packets%s\n", fInfo->id, fInfo->fp->count,
checksum_error ? "; Checksum error over IP header" : "");
}
if (fInfo->fp->count == MERGED_FILES) {
if (fInfo->fp->cksum == WRONG_CHKSUM) {
printf("Packet ID: %u, Count: %u, Problem: Checksum error over IP header\n", fInfo->id, fInfo->fp->count);
if (((delta < (average-cs->stats.variance)) || (delta > (average+cs->stats.variance))) && (delta > 0.0) && (cs->stats.variance != 0)) {
not_in_time = TRUE;
}
if ((nstime_cmp(&fInfo->fp->predecessor_time, &fInfo->zebra_time) > 0||nstime_cmp(&fInfo->fp->partner->fp->predecessor_time, &fInfo->fp->partner->zebra_time) > 0) && (fInfo->zebra_time.nsecs != MERGED_FILES) && ON_method) {
incorrect_order = TRUE;
}
printf("Packet ID: %u, Count: %u, Problem: Checksum error over IP header%s%s\n", fInfo->id, fInfo->fp->count,
not_in_time ? "; Did not arrive in time" : "", incorrect_order ? "; Incorrect order" : "");
} else if (((delta < (average-cs->stats.variance)) || (delta > (average+cs->stats.variance))) && (delta > 0.0) && (cs->stats.variance != 0)) {
printf("Packet ID: %u, Count: %u, Problem: Did not arrive in time\n", fInfo->id, fInfo->fp->count);
if ((nstime_cmp(&fInfo->fp->predecessor_time, &fInfo->zebra_time) > 0 || nstime_cmp(&fInfo->fp->partner->fp->predecessor_time, &fInfo->fp->partner->zebra_time) > 0) && fInfo->zebra_time.nsecs != MERGED_FILES && ON_method) {
incorrect_order = TRUE;
}
printf("Packet ID: %u, Count: %u, Problem: Did not arrive in time%s\n", fInfo->id, fInfo->fp->count,
incorrect_order ? "; Incorrect order" : "");
} else if ((nstime_cmp(&fInfo->fp->predecessor_time, &fInfo->zebra_time) > 0 || nstime_cmp(&fInfo->fp->partner->fp->predecessor_time, &fInfo->fp->partner->zebra_time) > 0) && fInfo->zebra_time.nsecs != MERGED_FILES && ON_method) {
printf("Packet ID: %u, Count: %u, Problem: Incorrect order", fInfo->id, fInfo->fp->count);
}
}
}
}
/* This callback is used when tshark wants us to draw/update our
* data to the output device. Since this is tshark only output is
* stdout.
* TShark will only call this callback once, which is when tshark has
* finished reading all packets and exists.
* If used with wireshark this may be called any time, perhaps once every 3
* seconds or so.
* This function may even be called in parallell with (*reset) or (*draw)
* so make sure there are no races. The data in the rpcstat_t can thus change
* beneath us. Beware.
*/
static void
comparestat_draw(void *prs)
{
comparestat_t *cs = (comparestat_t *)prs;
GString *filter_str = g_string_new("");
const gchar *statis_string;
guint32 first_file_amount, second_file_amount;
/* initial steps, clear all data before start*/
cs->zebra_time.secs = 0;
cs->zebra_time.nsecs = 1;
nstime_set_unset(&cs->current_time);
cs->ip_ttl_list = g_array_new(FALSE, FALSE, sizeof(guint8));
cs->last_hit = FALSE;
cs->start_ongoing_hits = 0;
cs->stop_ongoing_hits = 0;
cs->start_packet_nr_first = G_MAXINT32;
cs->start_packet_nr_second = G_MAXINT32;
cs->stop_packet_nr_first = G_MAXINT32;
cs->stop_packet_nr_second = G_MAXINT32;
cs->first_file_amount = 0;
cs->second_file_amount = 0;
time_stat_init(&cs->stats);
cs->ip_id_set = g_hash_table_new(NULL, NULL);
g_hash_table_foreach(cs->packet_set, call_foreach_count_ip_id, cs);
/* set up TTL choice if only one number found */
if (TTL_method&&cs->ip_ttl_list->len == 1) {
g_array_append_val(cs->ip_ttl_list, g_array_index(cs->ip_ttl_list, guint8, 1));
}
g_hash_table_foreach(cs->packet_set, call_foreach_new_order, cs);
g_hash_table_foreach(cs->packet_set, call_foreach_merge_settings, cs);
/* remembering file amounts */
first_file_amount = cs->first_file_amount;
second_file_amount = cs->second_file_amount;
/* reset after numbering */
g_hash_table_remove_all(cs->nr_set);
/* Variance */
cs->stats.variance = compare_variance;
/* add statistic string */
statis_string = g_strdup_printf(
"Filter: %s\n"
"Packet count: %i, 1st file: %i, 2nd file: %i\n"
"Scope 1: packet %i to %i\n"
"Scope 2: packet %i to %i\n"
"Equal packets: %i\n"
"Allowed variance: %.2f\n"
"Average time difference: %.2f\n"
"===================================================================\n",
cs->filter ? cs->filter : "<none>", (first_file_amount+second_file_amount),
first_file_amount, second_file_amount, cs->start_packet_nr_first,
cs->stop_packet_nr_first, cs->start_packet_nr_second, cs->stop_packet_nr_second,
cs->stats.num, cs->stats.variance, fabs(get_average(&cs->stats.tot, cs->stats.num)));
printf("\n");
printf("===================================================================\n");
printf(" Results\n");
printf("===================================================================\n");
printf("%s", statis_string);
g_hash_table_foreach(cs->ip_id_set, call_foreach_print_ip_tree, cs);
g_string_free(filter_str, TRUE);
g_hash_table_destroy(cs->ip_id_set);
g_array_free(cs->ip_ttl_list, TRUE);
}
/* When called, this function will create a new instance of comparestat.
* This function is called from tshark when it parses the -z compare, arguments
* and it creates a new instance to store statistics in and registers this
* new instance for the compare tap.
*/
static void
comparestat_init(const char *opt_arg, void *userdata _U_)
{
comparestat_t *cs;
const char *filter = NULL;
GString *error_string;
gint start, stop, ttl, order, pos = 0;
gdouble variance;
if (sscanf(opt_arg, "compare,%d,%d,%d,%d,%lf%n", &start, &stop, &ttl, &order, &variance, &pos) == 5) {
if (*(opt_arg+pos) == ',')
filter = opt_arg+pos+1;
} else {
fprintf(stderr, "tshark: invalid \"-z compare,<start>,<stop>,<ttl[0|1]>,<order[0|1]>,<variance>[,<filter>]\" argument\n");
exit(1);
}
compare_variance = variance;
compare_start = start;
compare_stop = stop;
TTL_method = ttl;
ON_method = order;
cs = g_new(comparestat_t, 1);
nstime_set_unset(&cs->current_time);
cs->ip_ttl_list = g_array_new(FALSE, FALSE, sizeof(guint8));
cs->last_hit = FALSE;
cs->start_ongoing_hits = 0;
cs->stop_ongoing_hits = 0;
cs->start_packet_nr_first = G_MAXINT32;
cs->start_packet_nr_second = G_MAXINT32;
cs->stop_packet_nr_first = G_MAXINT32;
cs->stop_packet_nr_second = G_MAXINT32;
cs->first_file_amount = 0;
cs->second_file_amount = 0;
cs->zebra_time.secs = 0;
cs->zebra_time.nsecs = 1;
cs->nr_set = g_hash_table_new(NULL, NULL);
if (filter) {
cs->filter = g_strdup(filter);
} else {
cs->filter = NULL;
}
/* create a Hash to count the packets with the same ip.id */
cs->packet_set = g_hash_table_new_full(NULL, NULL, NULL, frame_info_free);
error_string = register_tap_listener("ip", cs, filter, 0, comparestat_reset, comparestat_packet, comparestat_draw);
if (error_string) {
/* error, we failed to attach to the tap. clean up */
g_free(cs->filter);
g_hash_table_destroy(cs->packet_set);
g_free(cs);
fprintf(stderr, "tshark: Couldn't register compare tap: %s\n", error_string->str);
g_string_free(error_string, TRUE);
exit(1);
}
}
static stat_tap_ui comparestat_ui = {
REGISTER_STAT_GROUP_GENERIC,
NULL,
"compare",
comparestat_init,
0,
NULL
};
void
register_tap_listener_comparestat(void)
{
register_stat_tap_ui(&comparestat_ui, NULL);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/