tap-comparestat.c

   1 /* tap-comparestat.c
   2  * Compare two capture files
   3  * Copyright 2008 Vincenzo Condoleo, Christophe Dirac, Reto Ruoss
   4  * supported by HSR (Hochschule Rapperswil)
   5  *
   6  * $Id$
   7  *
   8  * Wireshark - Network traffic analyzer
   9  * By Gerald Combs <gerald@wireshark.org>
  10  * Copyright 1998 Gerald Combs
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  25  */
  26
  27 /* This module provides statistics about two merged capture files, to find packet loss,
  28  * time delay, ip header checksum errors and order check to tshark.
  29  * It's also detecting the matching regions of the different files.
  30  *
  31  * The packets are compared by the ip id. MAC or TTL is used to distinct the different files.
  32  * It is only used by tshark and not wireshark
  33  */
  34
  35 #ifdef HAVE_CONFIG_H
  36 # include "config.h"
  37 #endif
  38
  39 #include <stdio.h>
  40 #include <math.h>
  41
  42 #ifdef HAVE_SYS_TYPES_H
  43 # include <sys/types.h>
  44 #endif
  45
  46 #include <string.h>
  47 #include "epan/packet_info.h"
  48 #include <epan/in_cksum.h>
  49 #include <epan/packet.h>
  50 #include <epan/tap.h>
  51 #include <epan/timestamp.h>
  52 #include <epan/stat_cmd_args.h>
  53 #include <epan/dissectors/packet-ip.h>
  54 #include "timestats.h"
  55
  56
  57 /* For checksum */
  58 #define BYTES 8
  59 #define WRONG_CHKSUM 0
  60
  61 #define MERGED_FILES 2
  62
  63 #define TTL_SEARCH 5
  64
  65 /* information which will be printed */
  66 typedef struct _for_print {
  67         guint count;
  68         guint16 cksum;
  69         nstime_t predecessor_time;
  70         struct _frame_info *partner;
  71 } for_print;
  72
  73 /* each tracked packet */
  74 typedef struct _frame_info {
  75         for_print *fp;
  76         guint32 num;
  77         guint16 id;
  78         guint8 ip_ttl;
  79         address dl_dst;
  80         nstime_t abs_ts, zebra_time, delta;
  81 } frame_info;
  82
  83 /* used to keep track of the statistics for an entire program interface */
  84 typedef struct _comparestat_t {
  85         char *filter;
  86         emem_tree_t *packet_tree, *ip_id_tree, *nr_tree;
  87         address eth_dst, eth_src;
  88         nstime_t zebra_time, current_time;
  89         timestat_t stats;
  90         GArray *ip_ttl_list;
  91         gboolean last_hit;
  92         guint32 start_ongoing_hits, stop_ongoing_hits, start_packet_nr_first, start_packet_nr_second, stop_packet_nr_first, stop_packet_nr_second;
  93         guint32 first_file_amount, second_file_amount;
  94 } comparestat_t;
  95
  96
  97 /* to call directly _init */
  98 static gdouble compare_variance=0.0;
  99 static guint8 compare_start, compare_stop;
 100 static gboolean TTL_method=TRUE, ON_method=TRUE;
 101
 102 /* This callback is never used by tshark but it is here for completeness. */
 103 static void
 104 comparestat_reset(void *dummy _U_)
 105 {
 106 }
 107
 108
 109 /* This callback is invoked whenever the tap system has seen a packet
 110  * we might be interested in.
 111  * function returns :
 112  *  0: no updates, no need to call (*draw) later
 113  * !0: state has changed, call (*draw) sometime later
 114  */
 115 static int
 116 comparestat_packet(void *arg, packet_info *pinfo, epan_dissect_t *edt _U_, const void *arg2)
 117 {
 118         comparestat_t *cs=arg;
 119         const ws_ip *ci=arg2;
 120         frame_info *fInfo;
 121         vec_t cksum_vec[3];
 122         guint16 computed_cksum=0;
 123
 124         /* so this get filled, usually with the first frame */
 125         if(cs->eth_dst.len==0) {
 126                 cs->eth_dst=pinfo->dl_dst;
 127                 cs->eth_src=pinfo->dl_src;
 128         }
 129
 130         /* Set up the fields of the pseudo-header and create checksum */
 131         cksum_vec[0].ptr=&ci->ip_v_hl;
 132         cksum_vec[0].len=BYTES;
 133         /* skip TTL */
 134         cksum_vec[1].ptr=&ci->ip_p;
 135         cksum_vec[1].len=1;
 136         /* skip header checksum and ip's (because of NAT)*/
 137         cksum_vec[2].ptr=ci->ip_dst.data;
 138         cksum_vec[2].ptr=cksum_vec[2].ptr+ci->ip_dst.len;
 139         /* dynamic computation */
 140         cksum_vec[2].len=pinfo->iphdrlen-20;
 141         computed_cksum=in_cksum(&cksum_vec[0], 3);
 142
 143         /* collect all packet infos */
 144         fInfo=(frame_info*)se_alloc(sizeof(frame_info));
 145         fInfo->fp=(for_print*)se_alloc(sizeof(for_print));
 146         fInfo->fp->partner=NULL;
 147         fInfo->fp->count=1;
 148         fInfo->fp->cksum=computed_cksum;
 149         fInfo->num=pinfo->fd->num;
 150         fInfo->id=ci->ip_id;
 151         fInfo->ip_ttl=ci->ip_ttl;
 152         fInfo->dl_dst=pinfo->dl_dst;
 153         fInfo->abs_ts=pinfo->fd->abs_ts;
 154         /* clean memory */
 155         nstime_set_zero(&fInfo->zebra_time);
 156         nstime_set_zero(&fInfo->fp->predecessor_time);
 157         se_tree_insert32(cs->packet_tree, pinfo->fd->num, fInfo);
 158
 159         return 1;
 160 }
 161
 162 /* Find equal packets, same IP-Id, count them and make time statistics */
 163 static gboolean
 164 call_foreach_count_ip_id(gpointer value, gpointer arg)
 165 {
 166         comparestat_t *cs=(comparestat_t*)arg;
 167         frame_info *fInfo=(frame_info*)value, *fInfoTemp;
 168         nstime_t delta;
 169         guint i;
 170
 171         /* we only need one value out of pinfo we use a temp one */
 172         packet_info *pinfo=(packet_info*)ep_alloc(sizeof(packet_info));
 173         pinfo->fd=(frame_data*)ep_alloc(sizeof(frame_data));
 174         pinfo->fd->num = fInfo->num;
 175
 176         fInfoTemp=se_tree_lookup32(cs->ip_id_tree, fInfo->id);
 177         if(fInfoTemp==NULL){
 178                 /* Detect ongoing package loss */
 179                 if((cs->last_hit==FALSE)&&(cs->start_ongoing_hits>compare_start)&&(cs->stop_ongoing_hits<compare_stop)){
 180                         cs->stop_ongoing_hits++;
 181                         cs->stop_packet_nr_first=fInfo->num;
 182                 } else if(cs->stop_ongoing_hits<compare_stop){
 183                         cs->stop_ongoing_hits=0;
 184                         cs->stop_packet_nr_first=G_MAXINT32;
 185                 }
 186                 cs->last_hit=FALSE;
 187
 188                 fInfo->fp->count=1;
 189                 se_tree_insert32(cs->ip_id_tree, fInfo->id, fInfo);
 190         } else {
 191                 /* Detect ongoing package hits, special behavior if start is set to 0 */
 192                 if((cs->last_hit||(compare_start==0))&&(cs->start_ongoing_hits<compare_start||(compare_start==0))){
 193                         if((compare_start==0)&&(cs->start_ongoing_hits!=0)){
 194                                 /* start from the first packet so allready set */
 195                         } else {
 196                                 cs->start_ongoing_hits++;
 197                                 /* Take the lower number */
 198                                 cs->start_packet_nr_first=fInfoTemp->num;
 199                                 cs->start_packet_nr_second=fInfo->num;
 200                         }
 201                 } else if(cs->start_ongoing_hits<compare_start){
 202                         cs->start_ongoing_hits=0;
 203                         cs->start_packet_nr_first=G_MAXINT32;
 204                 }
 205                 cs->last_hit=TRUE;
 206
 207                 fInfo->fp->count=fInfoTemp->fp->count + 1;
 208                 if(fInfoTemp->fp->cksum!=fInfo->fp->cksum){
 209                         fInfo->fp->cksum=WRONG_CHKSUM;
 210                         fInfoTemp->fp->cksum=WRONG_CHKSUM;
 211                 }
 212                 /* Add partner */
 213                 fInfo->fp->partner=fInfoTemp;
 214                 /* Create time statistic */
 215                 if(fInfo->fp->count==MERGED_FILES){
 216                         nstime_delta(&delta, &fInfo->abs_ts, &fInfoTemp->abs_ts);
 217                         /* Set delta in both packets */
 218                         nstime_set_zero(&fInfoTemp->delta);
 219                         nstime_add(&fInfoTemp->delta, &delta);
 220                         nstime_set_zero(&fInfo->delta);
 221                         nstime_add(&fInfo->delta, &delta);
 222                         time_stat_update(&cs->stats, &delta, pinfo);
 223                 }
 224                 se_tree_insert32(cs->ip_id_tree, fInfo->id, fInfo);
 225         }
 226
 227         /* collect TTL's */
 228         if(TTL_method && (fInfo->num<TTL_SEARCH)){
 229                 for(i=0; i < cs->ip_ttl_list->len; i++){
 230                         if(g_array_index(cs->ip_ttl_list, guint8, i) == fInfo->ip_ttl){
 231                                 return FALSE;
 232                         }
 233                 }
 234                 g_array_append_val(cs->ip_ttl_list, fInfo->ip_ttl);
 235         }
 236
 237         return FALSE;
 238 }
 239
 240 /*Create new numbering */
 241 static gboolean
 242 call_foreach_new_order(gpointer value, gpointer arg)
 243 {
 244         comparestat_t *cs=(comparestat_t*)arg;
 245         frame_info *fInfo=(frame_info*)value, *fInfoTemp;
 246
 247         /* overwrite Info column for new ordering */
 248         fInfoTemp=se_tree_lookup32(cs->nr_tree, fInfo->id);
 249         if(fInfoTemp==NULL){
 250                 if(TTL_method==FALSE){
 251                         if((ADDRESSES_EQUAL(&cs->eth_dst, &fInfo->dl_dst)) || (ADDRESSES_EQUAL(&cs->eth_src, &fInfo->dl_dst))){
 252                                 se_tree_insert32(cs->nr_tree, fInfo->id, fInfo);
 253                                 fInfo->zebra_time=cs->zebra_time;
 254                                 cs->zebra_time.nsecs=cs->zebra_time.nsecs + MERGED_FILES;
 255                         } else {
 256                                 cs->zebra_time.nsecs++;
 257                                 se_tree_insert32(cs->nr_tree, fInfo->id, fInfo);
 258                                 fInfo->zebra_time=cs->zebra_time;
 259                                 cs->zebra_time.nsecs++;
 260                         }
 261                 } else {
 262                         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)){
 263                                 se_tree_insert32(cs->nr_tree, fInfo->id, fInfo);
 264                                 fInfo->zebra_time=cs->zebra_time;
 265                                 cs->zebra_time.nsecs=cs->zebra_time.nsecs + MERGED_FILES;
 266                         } else {
 267                                 cs->zebra_time.nsecs++;
 268                                 se_tree_insert32(cs->nr_tree, fInfo->id, fInfo);
 269                                 fInfo->zebra_time=cs->zebra_time;
 270                                 cs->zebra_time.nsecs++;
 271                         }
 272
 273                 }
 274         } else {
 275                 if(TTL_method==FALSE){
 276                         if(((ADDRESSES_EQUAL(&cs->eth_dst, &fInfo->dl_dst)) || (ADDRESSES_EQUAL(&cs->eth_src, &fInfo->dl_dst)))&&(!fmod(fInfoTemp->zebra_time.nsecs,MERGED_FILES))){
 277                                 fInfo->zebra_time.nsecs=fInfoTemp->zebra_time.nsecs;
 278                         } else {
 279                                 fInfo->zebra_time.nsecs=fInfoTemp->zebra_time.nsecs+1;
 280                         }
 281                 } else {
 282                         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))){
 283                                 fInfo->zebra_time.nsecs=fInfoTemp->zebra_time.nsecs;
 284                         } else {
 285                                 fInfo->zebra_time.nsecs=fInfoTemp->zebra_time.nsecs+1;
 286                         }
 287                 }
 288         }
 289
 290         /* count packets of file */
 291         if(fmod(fInfo->zebra_time.nsecs, MERGED_FILES)){
 292                 cs->first_file_amount++;
 293         } else {
 294                 cs->second_file_amount++;
 295         }
 296
 297         /* ordering */
 298         if(!nstime_is_unset(&cs->current_time)){
 299                 fInfo->fp->predecessor_time.nsecs=cs->current_time.nsecs;
 300         }
 301
 302         cs->current_time.nsecs=fInfo->zebra_time.nsecs;
 303
 304         return FALSE;
 305 }
 306
 307 /* calculate scopes if not set yet */
 308 static gboolean
 309 call_foreach_merge_settings(gpointer value, gpointer arg)
 310 {
 311         comparestat_t *cs=(comparestat_t*)arg;
 312         frame_info *fInfo=(frame_info*)value, *fInfoTemp=NULL;
 313         guint32 tot_packet_amount=cs->first_file_amount+cs->second_file_amount, swap;
 314
 315         if((fInfo->num==tot_packet_amount)&&(cs->stop_packet_nr_first!=G_MAXINT32)){
 316                 /* calculate missing stop number */
 317                 swap=cs->stop_packet_nr_first;
 318                 cs->stop_packet_nr_first=tot_packet_amount-cs->second_file_amount;;
 319                 cs->stop_packet_nr_second=swap;
 320         }
 321
 322         if((fInfo->num==tot_packet_amount)&&(cs->stop_packet_nr_first==G_MAXINT32)&&(cs->start_packet_nr_first!=G_MAXINT32)){
 323                 fInfoTemp=se_tree_lookup32(cs->packet_tree, cs->start_packet_nr_first);
 324                 if(fInfoTemp==NULL){
 325                         printf("ERROR: start number not set correctly\n");
 326                         return FALSE;
 327                 }
 328                 if(fmod(fInfoTemp->zebra_time.nsecs, 2)){
 329                         /*first file*/
 330                         cs->stop_packet_nr_first=cs->start_packet_nr_first+abs(cs->second_file_amount-(cs->start_packet_nr_second-cs->first_file_amount));
 331                         if(cs->stop_packet_nr_first>(tot_packet_amount-cs->second_file_amount)){
 332                                 cs->stop_packet_nr_first=tot_packet_amount-cs->second_file_amount;
 333                         }
 334                         /*this only happens if we have too many MAC's or TTL*/
 335                         if(cs->stop_packet_nr_first>cs->start_packet_nr_second){
 336                                 cs->stop_packet_nr_first=cs->start_packet_nr_second-1;
 337                         }
 338                         fInfoTemp=se_tree_lookup32(cs->packet_tree, cs->stop_packet_nr_first);
 339                         while((fInfoTemp!=NULL)?fmod(!fInfoTemp->zebra_time.nsecs, 2):TRUE){
 340                                 cs->stop_packet_nr_first--;
 341                                 fInfoTemp=se_tree_lookup32(cs->packet_tree, cs->stop_packet_nr_first);
 342                         }
 343                 } else {
 344                         /*this only happens if we have too many MAC's or TTL*/
 345                         cs->stop_packet_nr_first=cs->first_file_amount+cs->start_packet_nr_first;
 346                         if(cs->stop_packet_nr_first>tot_packet_amount-cs->first_file_amount){
 347                                 cs->stop_packet_nr_first=tot_packet_amount-cs->first_file_amount;
 348                         }
 349                         fInfoTemp=se_tree_lookup32(cs->packet_tree, cs->stop_packet_nr_first);
 350                         while((fInfoTemp!=NULL)?fmod(fInfoTemp->zebra_time.nsecs, 2):TRUE){
 351                                 cs->stop_packet_nr_first--;
 352                                 fInfoTemp=se_tree_lookup32(cs->packet_tree, cs->stop_packet_nr_first);
 353                         }
 354                 }
 355                 /* set second stop location */
 356                 cs->stop_packet_nr_second=cs->start_packet_nr_second+abs(cs->stop_packet_nr_first-cs->start_packet_nr_first);
 357                 if(cs->stop_packet_nr_second>tot_packet_amount){
 358                         cs->stop_packet_nr_second=tot_packet_amount;
 359                 }
 360         }
 361
 362         /* no start found */
 363         if(fInfo->num==tot_packet_amount&&compare_start!=0&&compare_stop!=0){
 364                 if(cs->start_packet_nr_first==G_MAXINT32){
 365                         printf("Start point couldn't be set, choose a lower compare start");
 366                 }
 367         }
 368
 369         return FALSE;
 370 }
 371
 372 static gboolean
 373 call_foreach_print_ip_tree(gpointer value, gpointer user_data)
 374 {
 375         frame_info *fInfo=(frame_info*)value;
 376         comparestat_t *cs=(comparestat_t*)user_data;
 377         gdouble delta, average;
 378         gboolean show_it=FALSE;
 379
 380         delta=fabs(get_average(&fInfo->delta,1));
 381         average=fabs(get_average(&cs->stats.tot, cs->stats.num));
 382
 383         /* special case if both are set to zero ignore start and stop numbering */
 384         if(compare_start!=0&&compare_stop!=0){
 385                 /* check out if packet is in searched scope */
 386                 if((cs->start_packet_nr_first<fInfo->num)&&(cs->stop_packet_nr_first>fInfo->num)){
 387                         show_it=TRUE;
 388                 } else {
 389                         /* so we won't miss the other file */
 390                         if((fInfo->num>cs->start_packet_nr_second)&&(fInfo->num<cs->stop_packet_nr_second)){
 391                                 show_it=TRUE;
 392                         }
 393                 }
 394         } else {
 395                 show_it=TRUE;
 396         }
 397
 398         if(show_it){
 399                 if(fInfo->fp->count < MERGED_FILES){
 400                         printf("Packet id :%i, count:%i Problem:", fInfo->id, fInfo->fp->count);
 401                         printf("Packet lost\n");
 402                 }
 403                 if(fInfo->fp->count > MERGED_FILES){
 404                         printf("Packet id :%i, count:%i Problem:", fInfo->id, fInfo->fp->count);
 405                         printf("More than two packets\n");
 406                         if(fInfo->fp->cksum == WRONG_CHKSUM){
 407                                 printf("Checksum error over IP header\n");
 408                         }
 409                 }
 410                 if(fInfo->fp->count == MERGED_FILES){
 411                         if(fInfo->fp->cksum == WRONG_CHKSUM){
 412                                 printf("Packet id :%i, count:%i Problem:", fInfo->id, fInfo->fp->count);
 413                                 printf("Checksum error over IP header\n");
 414                                 if(((delta < (average-cs->stats.variance)) || (delta > (average+cs->stats.variance))) && (delta > 0.0) && (cs->stats.variance!=0)){
 415                                         printf("Not arrived in time\n");
 416                                 }
 417                                 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){
 418                                         printf("Not correct order\n");
 419                                 }
 420                         } else if(((delta < (average-cs->stats.variance)) || (delta > (average+cs->stats.variance))) && (delta > 0.0) && (cs->stats.variance!=0)) {
 421                                 printf("Packet id :%i, count:%i Problem:", fInfo->id, fInfo->fp->count);
 422                                 printf("Package not arrived in time\n");
 423                                 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){
 424                                         printf("Not correct order\n");
 425                                 }
 426                         } 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){
 427                                 printf("Packet id :%i, count:%i Problem:", fInfo->id, fInfo->fp->count);
 428                                 printf("Not correct order\n");
 429                         }
 430                 }
 431         }
 432         return FALSE;
 433 }
 434
 435
 436 /* This callback is used when tshark wants us to draw/update our
 437  * data to the output device. Since this is tshark only output is
 438  * stdout.
 439  * TShark will only call this callback once, which is when tshark has
 440  * finished reading all packets and exists.
 441  * If used with wireshark this may be called any time, perhaps once every 3
 442  * seconds or so.
 443  * This function may even be called in parallell with (*reset) or (*draw)
 444  * so make sure there are no races. The data in the rpcstat_t can thus change
 445  * beneath us. Beware.
 446  */
 447 static void
 448 comparestat_draw(void *prs)
 449 {
 450         comparestat_t *cs=prs;
 451         GString *filter_str = g_string_new("");
 452         const gchar *statis_string;
 453         guint32 first_file_amount, second_file_amount;
 454
 455         /* inital steps, clear all data before start*/
 456         cs->zebra_time.secs=0;
 457         cs->zebra_time.nsecs=1;
 458         nstime_set_unset(&cs->current_time);
 459         cs->ip_ttl_list=g_array_new(FALSE, FALSE, sizeof(guint8));
 460         cs->last_hit=FALSE;
 461         cs->start_ongoing_hits=0;
 462         cs->stop_ongoing_hits=0;
 463         cs->start_packet_nr_first=G_MAXINT32;
 464         cs->start_packet_nr_second=G_MAXINT32;
 465         cs->stop_packet_nr_first=G_MAXINT32;
 466         cs->stop_packet_nr_second=G_MAXINT32;
 467         cs->first_file_amount=0;
 468         cs->second_file_amount=0;
 469
 470         time_stat_init(&cs->stats);
 471         /* not using g_free, because struct is managed by binarytrees */
 472         cs->ip_id_tree=se_tree_create(EMEM_TREE_TYPE_RED_BLACK, "ip_id_tree");
 473         emem_tree_foreach(cs->packet_tree, call_foreach_count_ip_id, cs);
 474
 475         /* set up TTL choice if only one number found */
 476         if(TTL_method&&cs->ip_ttl_list->len==1){
 477                 g_array_append_val(cs->ip_ttl_list, g_array_index(cs->ip_ttl_list, guint8, 1));
 478         }
 479
 480         emem_tree_foreach(cs->packet_tree, call_foreach_new_order,cs);
 481         emem_tree_foreach(cs->packet_tree, call_foreach_merge_settings, cs);
 482
 483         /* remembering file amounts */
 484         first_file_amount=cs->first_file_amount;
 485         second_file_amount=cs->second_file_amount;
 486         /* reset after numbering */
 487         cs->nr_tree=se_tree_create(EMEM_TREE_TYPE_RED_BLACK, "nr_tree");
 488
 489         /* Variance */
 490         cs->stats.variance=compare_variance;
 491
 492         /* add statistic string */
 493         statis_string=g_strdup_printf("Compare Statistics: \nNumber of packets total:%i 1st file:%i, 2nd file:%i\nScopes:\t start:%i stop:%i\nand:\t start:%i stop:%i\nEqual packets: %i \nAllowed variation: %f \nAverage time difference: %f\n", (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)));
 494
 495         printf("\n");
 496         printf("===================================================================\n");
 497         printf("%s", statis_string);
 498         emem_tree_foreach(cs->ip_id_tree, call_foreach_print_ip_tree, cs);
 499         printf("===================================================================\n");
 500         g_string_free(filter_str, TRUE);
 501         g_array_free(cs->ip_ttl_list, TRUE);
 502 }
 503
 504 /* When called, this function will create a new instance of comparestat.
 505  * This function is called from tshark when it parses the -z compare, arguments
 506  * and it creates a new instance to store statistics in and registers this
 507  * new instance for the compare tap.
 508  */
 509 static void
 510 comparestat_init(const char *optarg, void* userdata _U_)
 511 {
 512         comparestat_t *cs;
 513         const char *filter=NULL;
 514         GString *error_string;
 515         gint start, stop,ttl, order, pos=0;
 516         gdouble variance;
 517
 518         if(sscanf(optarg,"compare,%d,%d,%d,%d,%lf,%n",&start, &stop, &ttl, &order, &variance, &pos)==5){
 519                 if(pos){
 520                         filter=optarg+pos;
 521                 } else {
 522                         filter=NULL;
 523                 }
 524         } else {
 525                 fprintf(stderr, "tshark: invalid \"-z compare,<start>,<stop>,<ttl[0|1]>,<order[0|1]>,<variance>[,<filter>]\" argument\n");
 526                 exit(1);
 527         }
 528
 529         compare_variance=variance;
 530         compare_start=start;
 531         compare_stop=stop;
 532         TTL_method=ttl;
 533         ON_method=order;
 534
 535         cs=g_malloc(sizeof(comparestat_t));
 536         nstime_set_unset(&cs->current_time);
 537         cs->ip_ttl_list=g_array_new(FALSE, FALSE, sizeof(guint8));
 538         cs->last_hit=FALSE;
 539         cs->start_ongoing_hits=0;
 540         cs->stop_ongoing_hits=0;
 541         cs->start_packet_nr_first=G_MAXINT32;
 542         cs->start_packet_nr_second=G_MAXINT32;
 543         cs->stop_packet_nr_first=G_MAXINT32;
 544         cs->stop_packet_nr_second=G_MAXINT32;
 545         cs->first_file_amount=0;
 546         cs->second_file_amount=0;
 547
 548         cs->zebra_time.secs=0;
 549         cs->zebra_time.nsecs=1;
 550         cs->nr_tree=se_tree_create(EMEM_TREE_TYPE_RED_BLACK, "nr_tree");
 551         /* microsecond precision */
 552         timestamp_set_precision(TS_PREC_AUTO_NSEC);
 553
 554         if(filter){
 555                 cs->filter=g_strdup(filter);
 556         } else {
 557                 cs->filter=NULL;
 558         }
 559
 560         /* create a Hash to count the packets with the same ip.id */
 561         cs->packet_tree=se_tree_create(EMEM_TREE_TYPE_RED_BLACK, "Packet_info_tree");
 562
 563         error_string=register_tap_listener("ip", cs, filter, 0, comparestat_reset, comparestat_packet, comparestat_draw);
 564         if(error_string){
 565                 /* error, we failed to attach to the tap. clean up */
 566                 g_free(cs->filter);
 567                 g_free(cs);
 568
 569                 fprintf(stderr, "tshark: Couldn't register compare tap: %s\n", error_string->str);
 570                 g_string_free(error_string, TRUE);
 571                 exit(1);
 572         }
 573 }
 574
 575
 576 void
 577 register_tap_listener_comparestat(void)
 578 {
 579         register_stat_cmd_arg("compare,", comparestat_init,NULL);
 580 }