/* bootp_stat.c
 * boop_stat   2003 Jean-Michel FAYARD
 *
 * $Id: bootp_stat.c 18197 2006-05-21 05:12:17Z sahlberg $
 *
 * 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.
 */

/* #define DEBUG	do{ printf("%s:%d  ",__FILE__,__LINE__);} while(0); */
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <gtk/gtk.h>
#include <string.h>

#include <epan/packet_info.h>
#include <epan/epan.h>

#include "simple_dialog.h"
#include "gui_utils.h"
#include "dlg_utils.h"
#include <epan/tap.h>
#include "../register.h"
#include "../globals.h"
#include "compat_macros.h"
#include "../stat_menu.h"
#include "../tap_dfilter_dlg.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;
	GtkWidget 	*win;
	GHashTable	*hash;
	GtkWidget	*table_message_type;
	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;
	GtkWidget	*widget;/* label in which we print the number of packets */
	dhcpstat_t	*sp;	/* entire program interface */
} dhcp_message_type_t;

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 * unused _U_ )
{
	char string_buff[256];

	if ((data==NULL) || (data->packets==0))
		return;
	if (data->widget==NULL){	/* create an entry in the table */
		GtkWidget	*tmp;
		int x = 2*((data->sp->index) % 2);
		int y = (data->sp->index) /2;


		/* Maybe we should display the hexadecimal value ? */
		/* g_snprintf(string_buff, 256, "%s  (0X%x)", data->name, *key); */
		tmp = gtk_label_new( data->name  /* string_buff */ );
		gtk_table_attach_defaults(GTK_TABLE(data->sp->table_message_type), tmp, x, x+1, y, y+1);
		gtk_label_set_justify(GTK_LABEL(tmp), GTK_JUSTIFY_LEFT);
		gtk_widget_show(tmp);

		g_snprintf( string_buff, 256, "%9d", data->packets );
		data->widget = gtk_label_new( string_buff );
		gtk_table_attach_defaults(GTK_TABLE(data->sp->table_message_type), data->widget, x+1, x+2, y, y+1);
		gtk_label_set_justify(GTK_LABEL(data->widget), GTK_JUSTIFY_LEFT);
		gtk_widget_show( data->widget );

		data->sp->index++;
	} else {
		/* Just update the label string */
		g_snprintf( string_buff, 256, "%9d", data->packets );
		gtk_label_set( GTK_LABEL(data->widget), string_buff);
	}
}
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) {
		/*g_warning("%s:%d What's Wrong for %s, doc ?", __FILE__, __LINE__, value);*/
		sc = g_malloc( sizeof(dhcp_message_type_t) );
		sc -> packets = 1;
		sc -> name = value;
		sc -> widget=NULL;
		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;
	guint index;

	index=sp->index;
	g_hash_table_foreach( sp->hash, (GHFunc) dhcp_draw_message_type, NULL );
	if (index != sp->index){
		/* We have inserted a new entry corresponding to a status code ,
		 * let's resize the table */
		gtk_table_resize ( GTK_TABLE(sp->table_message_type), sp->index  % 2 , 4);
	}
	
}



/* since the gtk2 implementation of tap is multithreaded we must protect
 * remove_tap_listener() from modifying the list while draw_tap_listener()
 * is running.  the other protected block is in main.c
 *
 * there should not be any other critical regions in gtk2
 */
void protect_thread_critical_region(void);
void unprotect_thread_critical_region(void);
static void
win_destroy_cb(GtkWindow *win _U_, gpointer data)
{
	dhcpstat_t *sp=(dhcpstat_t *)data;

	protect_thread_critical_region();
	remove_tap_listener(sp);
	unprotect_thread_critical_region();

	g_free(sp->filter);
	g_hash_table_foreach( sp->hash, (GHFunc)dhcp_free_hash, NULL);
	g_hash_table_destroy( sp->hash);	
	g_free(sp);
}


/* When called, this function will create a new instance of gtk2-dhcpstat.
 */
static void
dhcpstat_init(const char *optarg, void *userdata _U_)
{
	dhcpstat_t *sp;
	const char	*filter=NULL;
	char 		*title=NULL;
	GString		*error_string;
	GtkWidget	*message_type_fr;
	GtkWidget	*vbox;
	GtkWidget	*bt_close;
	GtkWidget	*bbox;
	
	if (strncmp (optarg, "bootp,stat,", 11) == 0){
		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);
		title=g_strdup_printf("DHCP statistics with filter: %s", filter);
	} else {
		sp->filter=NULL;
		title=g_strdup("DHCP statistics");
	}

	/* top level window */
	sp->win = window_new(GTK_WINDOW_TOPLEVEL, title);
	g_free(title);

	vbox = gtk_vbox_new(FALSE, 3);
	gtk_container_add(GTK_CONTAINER(sp->win), vbox);
	gtk_container_set_border_width(GTK_CONTAINER(vbox), 12);

	/* Status Codes frame */
	message_type_fr = gtk_frame_new("DHCP Message Type");
  	gtk_container_add(GTK_CONTAINER(vbox), message_type_fr);
  	gtk_widget_show(message_type_fr);
	
	sp->table_message_type = gtk_table_new( 0, 4, FALSE);
	gtk_table_set_col_spacings( GTK_TABLE(sp->table_message_type), 10);
	gtk_container_add( GTK_CONTAINER( message_type_fr), sp->table_message_type);
	gtk_container_set_border_width( GTK_CONTAINER(sp->table_message_type) , 10);
	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 */
		simple_dialog( ESD_TYPE_ERROR, ESD_BTN_OK, error_string->str );
		g_free(sp->filter);
		g_free(sp);
		g_string_free(error_string, TRUE);
		return ;
	}

	/* Button row. */
	bbox = dlg_button_row_new(GTK_STOCK_CLOSE, NULL);
	gtk_box_pack_start(GTK_BOX(vbox), bbox, FALSE, FALSE, 0);

	bt_close = OBJECT_GET_DATA(bbox, GTK_STOCK_CLOSE);
	window_set_cancel_button(sp->win, bt_close, window_cancel_button_cb);

	SIGNAL_CONNECT(sp->win, "delete_event", window_delete_event_cb, NULL);
	SIGNAL_CONNECT(sp->win, "destroy", win_destroy_cb, sp);

	gtk_widget_show_all(sp->win);

	window_present(sp->win);

	cf_retap_packets(&cfile, FALSE);
}

static tap_dfilter_dlg dhcp_stat_dlg = {
	"BOOTP-DHCP Packet Counter",
	"bootp,stat",
	dhcpstat_init,
	-1
};

void
register_tap_listener_gtkdhcpstat(void)
{
	register_dfilter_stat(&dhcp_stat_dlg, "BOOTP-DHCP",
	    REGISTER_STAT_GROUP_NONE);
}