tap-bootpstat.c

   1 /* tap-bootpstat.c
   2  * boop_stat   2003 Jean-Michel FAYARD
   3  *
   4  * $Id$
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 1998 Gerald Combs
   9  *
  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.
  14  *
  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.
  19  *
  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.
  23  */
  24
  25 #ifdef HAVE_CONFIG_H
  26 # include "config.h"
  27 #endif
  28
  29 #include <stdio.h>
  30 #include <string.h>
  31
  32 #include "epan/packet_info.h"
  33 #include <epan/tap.h>
  34 #include <epan/stat_cmd_args.h>
  35 #include "register.h"
  36
  37
  38 typedef const char* bootp_info_value_t;
  39
  40 /* used to keep track of the statictics for an entire program interface */
  41 typedef struct _dhcp_stats_t {
  42         char            *filter;
  43         GHashTable      *hash;
  44         guint            index; /* Number of  to display */
  45 } dhcpstat_t;
  46 /* used to keep track of a single DHCP message type */
  47 typedef struct _dhcp_message_type_t {
  48         const char      *name;
  49         guint32          packets;
  50         dhcpstat_t      *sp;    /* entire program interface */
  51 } dhcp_message_type_t;
  52
  53
  54 /* Not used anywhere at this moment */
  55 /*
  56 static void
  57 dhcp_free_hash( gpointer key _U_ , gpointer value, gpointer user_data _U_ )
  58 {
  59         g_free(value);
  60 }
  61 */
  62
  63 static void
  64 dhcp_reset_hash(gchar *key _U_ , dhcp_message_type_t *data, gpointer ptr _U_ )
  65 {
  66         data->packets = 0;
  67 }
  68
  69 /* Update the entry corresponding to the number of packets of a special DHCP Message Type
  70  * or create it if it don't exist.
  71  */
  72 static void
  73 dhcp_draw_message_type(gchar *key _U_, dhcp_message_type_t *data, gchar * format )
  74 {
  75         if ((data==NULL) || (data->packets==0))
  76                 return;
  77         printf( format, data->name, data->packets);
  78 }
  79 static void
  80 dhcpstat_reset(void *psp)
  81 {
  82         dhcpstat_t *sp=psp;
  83         g_hash_table_foreach( sp->hash, (GHFunc)dhcp_reset_hash, NULL);
  84 }
  85 static int
  86 dhcpstat_packet(void *psp, packet_info *pinfo _U_, epan_dissect_t *edt _U_, const void *pri)
  87 {
  88         dhcpstat_t *sp=psp;
  89         const bootp_info_value_t value=pri;
  90         dhcp_message_type_t *sc;
  91
  92         if (sp==NULL)
  93                 return 0;
  94         sc = g_hash_table_lookup(
  95                         sp->hash,
  96                         value);
  97         if (!sc) {
  98                 sc = g_malloc( sizeof(dhcp_message_type_t) );
  99                 sc -> packets = 1;
 100                 sc -> name = value;
 101                 sc -> sp = sp;
 102                 g_hash_table_insert(
 103                                 sp->hash,
 104                                 (gpointer) value,
 105                                 sc);
 106         } else {
 107                 /*g_warning("sc(%s)->packets++", sc->name);*/
 108                 sc->packets++;
 109         }
 110         return 1;
 111 }
 112
 113
 114 static void
 115 dhcpstat_draw(void *psp)
 116 {
 117         dhcpstat_t *sp=psp;
 118
 119         printf("\n");
 120         printf("===================================================================\n");
 121
 122         if (sp->filter==NULL)
 123                 printf("BOOTP Statistics\n");
 124         else
 125                 printf("BOOTP Statistics with filter %s\n",  sp->filter);
 126         printf("BOOTP Option 53: DHCP Messages Types:\n");
 127         printf("DHCP Message Type      Packets nb\n" );
 128         g_hash_table_foreach( sp->hash, (GHFunc) dhcp_draw_message_type,
 129                         "%23s %-9d\n" );
 130         printf("===================================================================\n");
 131
 132 }
 133
 134
 135
 136
 137 /* When called, this function will create a new instance of tap-boopstat.
 138  */
 139 static void
 140 dhcpstat_init(const char *optarg, void* userdata _U_)
 141 {
 142         dhcpstat_t *sp;
 143         const char      *filter=NULL;
 144         GString         *error_string;
 145
 146         if (!strncmp (optarg, "bootp,stat,", 11)){
 147                 filter=optarg+11;
 148         } else {
 149                 filter=NULL;
 150         }
 151
 152         sp = g_malloc( sizeof(dhcpstat_t) );
 153         sp->hash = g_hash_table_new( g_str_hash, g_str_equal);
 154         if(filter){
 155                 sp->filter=g_malloc(strlen(filter)+1);
 156                 strcpy(sp->filter,filter);
 157         } else {
 158                 sp->filter=NULL;
 159         }
 160         sp->index = 0;          /* Nothing to display yet */
 161
 162         error_string = register_tap_listener(
 163                         "bootp",
 164                         sp,
 165                         filter,
 166                         dhcpstat_reset,
 167                         dhcpstat_packet,
 168                         dhcpstat_draw);
 169         if (error_string){
 170                 /* error, we failed to attach to the tap. clean up */
 171                 g_free(sp->filter);
 172                 g_free(sp);
 173                 fprintf(stderr, "tshark: Couldn't register dhcp,stat tap: %s\n",
 174                                 error_string->str);
 175                 g_string_free(error_string, TRUE);
 176                 exit(1);
 177         }
 178 }
 179
 180
 181
 182 void
 183 register_tap_listener_gtkdhcpstat(void)
 184 {
 185         register_stat_cmd_arg("bootp,stat,", dhcpstat_init,NULL);
 186 }
 187