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