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tap-bootpstat.c

/* tap-bootpstat.c
 * boop_stat   2003 Jean-Michel FAYARD
 *
 * $Id: tap-bootpstat.c 24258 2008-02-03 15:38:20Z stig $
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <stdio.h>
#include <string.h>

#include "epan/packet_info.h"
#include <epan/tap.h>
#include <epan/stat_cmd_args.h>
#include "register.h"


typedef const char* bootp_info_value_t;

/* used to keep track of the statictics for an entire program interface */
typedef struct _dhcp_stats_t {
      char        *filter;
      GHashTable  *hash;
      guint        index;     /* Number of  to display */
} dhcpstat_t;
/* used to keep track of a single DHCP message type */
typedef struct _dhcp_message_type_t {
      const char  *name;
      guint32            packets;
      dhcpstat_t  *sp;  /* entire program interface */
} dhcp_message_type_t;


/* Not used anywhere at this moment */
/*
static void
dhcp_free_hash( gpointer key _U_ , gpointer value, gpointer user_data _U_ )
{
      g_free(value);
}
*/

static void
dhcp_reset_hash(gchar *key _U_ , dhcp_message_type_t *data, gpointer ptr _U_ ) 
{     
      data->packets = 0;
}

/* Update the entry corresponding to the number of packets of a special DHCP Message Type
 * or create it if it don't exist.
 */
static void
dhcp_draw_message_type(gchar *key _U_, dhcp_message_type_t *data, gchar * format )
{
      if ((data==NULL) || (data->packets==0))
            return;
      printf( format, data->name, data->packets);
}
static void
dhcpstat_reset(void *psp)
{
      dhcpstat_t *sp=psp;
      g_hash_table_foreach( sp->hash, (GHFunc)dhcp_reset_hash, NULL);   
}
static int
dhcpstat_packet(void *psp, packet_info *pinfo _U_, epan_dissect_t *edt _U_, const void *pri)
{
      dhcpstat_t *sp=psp;
      const bootp_info_value_t value=pri;
      dhcp_message_type_t *sc;

      if (sp==NULL)
            return 0;
      sc = g_hash_table_lookup( 
                  sp->hash, 
                  value);
      if (!sc) {
            sc = g_malloc( sizeof(dhcp_message_type_t) );
            sc -> packets = 1;
            sc -> name = value;
            sc -> sp = sp;
            g_hash_table_insert(
                        sp->hash,
                        (gpointer) value,
                        sc);
      } else {
            /*g_warning("sc(%s)->packets++", sc->name);*/
            sc->packets++;
      }
      return 1;
}


static void
dhcpstat_draw(void *psp)
{
      dhcpstat_t *sp=psp;

      printf("\n");
      printf("===================================================================\n");

      if (sp->filter==NULL) 
            printf("BOOTP Statistics\n");
      else
            printf("BOOTP Statistics with filter %s\n",  sp->filter);
      printf("BOOTP Option 53: DHCP Messages Types:\n");
      printf("DHCP Message Type      Packets nb\n" );
      g_hash_table_foreach( sp->hash, (GHFunc) dhcp_draw_message_type,
                  "%23s %-9d\n" );
      printf("===================================================================\n");
      
}




/* When called, this function will create a new instance of tap-boopstat.
 */
static void
dhcpstat_init(const char *optarg, void* userdata _U_)
{
      dhcpstat_t *sp;
      const char  *filter=NULL;
      GString           *error_string;
      
      if (!strncmp (optarg, "bootp,stat,", 11)){
            filter=optarg+11;
      } else {
            filter=NULL;
      }
      
      sp = g_malloc( sizeof(dhcpstat_t) );
      sp->hash = g_hash_table_new( g_str_hash, g_str_equal);
      if(filter){
            sp->filter=g_strdup(filter);
      } else {
            sp->filter=NULL;
      }
      sp->index = 0;          /* Nothing to display yet */

      error_string = register_tap_listener( 
                  "bootp",
                  sp,
                  filter,
                  dhcpstat_reset,
                  dhcpstat_packet,
                  dhcpstat_draw);
      if (error_string){
            /* error, we failed to attach to the tap. clean up */
            g_free(sp->filter);
            g_free(sp);
            fprintf(stderr, "tshark: Couldn't register dhcp,stat tap: %s\n",
                        error_string->str);
            g_string_free(error_string, TRUE);
            exit(1);
      }
}



void
register_tap_listener_gtkdhcpstat(void)
{
      register_stat_cmd_arg("bootp,stat,", dhcpstat_init,NULL);
}


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