wireshark/ui/gtk/flow_graph.c

/* flow_graph.c
 * $Id$
 * Allows to display a flow graph of the currently displayed packets
 *
 * Copyright 2004, Ericsson , Spain
 * By Francisco Alcoba <francisco.alcoba@ericsson.com>
 *
 * 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 <string.h>

#include <gtk/gtk.h>

#include <epan/epan.h>
#include <epan/packet.h>
#include <epan/filesystem.h>
#include <epan/stat_cmd_args.h>
#include <epan/to_str.h>
#include <epan/tap.h>
#include <epan/dissectors/packet-tcp.h>
#include <epan/strutil.h>

#include "../stat_menu.h"
#include "ui/simple_dialog.h"

#include "ui/gtk/graph_analysis.h"
#include "ui/gtk/gui_stat_menu.h"
#include "ui/gtk/dlg_utils.h"
#include "ui/gtk/gui_utils.h"
#include "ui/gtk/stock_icons.h"
#include "ui/gtk/gtkglobals.h"
#include "ui/gtk/main.h"



#define TYPE_OF_PACKETS_DISPLAYED 0
#define TYPE_OF_PACKETS_ALL 1

#define TYPE_OF_FLOW_GENERAL 0
#define TYPE_OF_FLOW_TCP 1

#define NODE_ADDR_TYPE_SRCDST 0
#define NODE_ADDR_TYPE_NET_SRCDST 1

static int type_of_packets = TYPE_OF_PACKETS_DISPLAYED;
static int type_of_flow    = TYPE_OF_FLOW_GENERAL;
static int node_addr_type  = NODE_ADDR_TYPE_SRCDST;

static int tap_identifier;
static gboolean have_frame_tap_listener=FALSE;
static gboolean have_tcp_tap_listener=FALSE;
static graph_analysis_info_t *graph_analysis = NULL;
static graph_analysis_data_t *graph_analysis_data = NULL;

static GtkWidget *flow_graph_dlg = NULL;

static GtkWidget *select_all_rb;
static GtkWidget *select_displayed_rb;
static GtkWidget *select_general_rb;
static GtkWidget *select_tcp_rb;
static GtkWidget *src_dst_rb;
static GtkWidget *net_src_dst_rb;

/****************************************************************************/
/* free up memory and initialize the pointers */

static void
flow_graph_reset(void *ptr _U_)
{
	graph_analysis_item_t *graph_item;

	GList* list;

	if (graph_analysis !=NULL){

		/* free the graph data items */
		list = g_list_first(graph_analysis->list);
		while (list)
		{
			graph_item = list->data;
			g_free(graph_item->frame_label);
			g_free(graph_item->comment);
			g_free(list->data);
			list = g_list_next(list);
		}
		g_list_free(graph_analysis->list);
		graph_analysis->nconv = 0;
		graph_analysis->list = NULL;
	}
}

/****************************************************************************/
static void
flow_graph_data_init(void) {
	graph_analysis = g_malloc(sizeof(graph_analysis_info_t));
	graph_analysis->nconv = 0;
	graph_analysis->list = NULL;
}


/****************************************************************************/
static void
remove_tap_listener_flow_graph(void)
{
	protect_thread_critical_region();
	remove_tap_listener(&(tap_identifier));
	unprotect_thread_critical_region();

	have_frame_tap_listener=FALSE;
	have_tcp_tap_listener=FALSE;
}


/****************************************************************************/
/* CALLBACKS                                                                */
/****************************************************************************/
static void
flow_graph_on_destroy(GObject *object _U_, gpointer user_data _U_)
{
	/* remove_tap_listeners */
	remove_tap_listener_flow_graph();

	/* Clean up memory used by tap */
	flow_graph_reset(NULL);

	g_assert(graph_analysis != NULL);
	g_assert(graph_analysis_data != NULL);

	g_free(graph_analysis);
	graph_analysis = NULL;

	g_free(graph_analysis_data);
	graph_analysis_data = NULL;

	/* Note that we no longer have a "Flow Graph" dialog box. */
	flow_graph_dlg = NULL;
}


/****************************************************************************/
static void
toggle_select_all(GtkWidget *widget _U_, gpointer user_data _U_)
{
	/* is the button now active? */
	if (gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(select_all_rb))) {
		type_of_packets = TYPE_OF_PACKETS_ALL;
	}
}

/****************************************************************************/
static void
toggle_select_displayed(GtkWidget *widget _U_, gpointer user_data _U_)
{
	/* is the button now active? */
	if (gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(select_displayed_rb))) {
		type_of_packets = TYPE_OF_PACKETS_DISPLAYED;
	}
}

/****************************************************************************/
static void
toggle_select_general(GtkWidget *widget _U_, gpointer user_data _U_)
{
	/* is the button now active? */
	if (gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(select_general_rb))) {
		type_of_flow = TYPE_OF_FLOW_GENERAL;
	}
}

/****************************************************************************/
static void
toggle_select_tcp(GtkWidget *widget _U_, gpointer user_data _U_)
{
	/* is the button now active? */
	if (gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(select_tcp_rb))) {
		type_of_flow = TYPE_OF_FLOW_TCP;
	}
}

/****************************************************************************/
static void
toggle_select_srcdst(GtkWidget *widget _U_, gpointer user_data _U_)
{
	/* is the button now active? */
	if (gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(src_dst_rb))) {
		node_addr_type = NODE_ADDR_TYPE_SRCDST;
	}
}

/****************************************************************************/
static void
toggle_select_netsrcdst(GtkWidget *widget _U_, gpointer user_data _U_)
{
	/* is the button now active? */
	if (gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(net_src_dst_rb))) {
		node_addr_type = NODE_ADDR_TYPE_NET_SRCDST;
	}
}

/****************************************************************************/
/* Add a new frame into the graph */
static int
flow_graph_frame_add_to_graph(packet_info *pinfo)
{
	graph_analysis_item_t *gai;
	int i;
	gchar *protocol;
	gchar *colinfo;

	protocol=NULL;
	colinfo=NULL;

	if (node_addr_type == NODE_ADDR_TYPE_NET_SRCDST) {
		if (pinfo->net_src.type!=AT_NONE && pinfo->net_dst.type!=AT_NONE) {
			gai = g_malloc(sizeof(graph_analysis_item_t));
			COPY_ADDRESS(&(gai->src_addr),&(pinfo->net_src));
			COPY_ADDRESS(&(gai->dst_addr),&(pinfo->net_dst));
		}
		else return 0;

	} else {
		if (pinfo->src.type!=AT_NONE && pinfo->dst.type!=AT_NONE) {
			gai = g_malloc(sizeof(graph_analysis_item_t));
			COPY_ADDRESS(&(gai->src_addr),&(pinfo->src));
			COPY_ADDRESS(&(gai->dst_addr),&(pinfo->dst));
		}
		else return 0;
	}

	gai->fd = pinfo->fd;

	gai->port_src=pinfo->srcport;
	gai->port_dst=pinfo->destport;
	gai->comment=NULL;
	gai->frame_label=NULL;

	/* this code doesn't make sense.
	g_free(gai->comment);
	g_free(gai->frame_label);
	*/

	if(pinfo->cinfo) {
		if (pinfo->cinfo->col_first[COL_INFO]>=0){

			for (i = pinfo->cinfo->col_first[COL_INFO]; i <= pinfo->cinfo->col_last[COL_INFO]; i++) {
				if (pinfo->cinfo->fmt_matx[i][COL_INFO]) {
					colinfo = g_strdup(pinfo->cinfo->col_data[i]);
					/* break; ? or g_free(colinfo); before g_strdup() */
				}
			}
		}

		if (pinfo->cinfo->col_first[COL_PROTOCOL]>=0){

			for (i = pinfo->cinfo->col_first[COL_PROTOCOL]; i <= pinfo->cinfo->col_last[COL_PROTOCOL]; i++) {
				if (pinfo->cinfo->fmt_matx[i][COL_PROTOCOL]) {
					protocol = g_strdup(pinfo->cinfo->col_data[i]);
					/* break; ? or g_free(protocol); before g_strdup() */
				}
			}
		}
	}

	if (colinfo != NULL) {
		if (protocol != NULL) {
			gai->frame_label = g_strdup_printf("%.19s", colinfo);
			gai->comment = g_strdup_printf("%s: %s", protocol, colinfo);
		} else {
			gai->frame_label = g_strdup_printf("%.19s", colinfo);
			gai->comment = g_strdup_printf("%s", colinfo);
		}
	} else {
		/* This will probably never happen...*/
		if (protocol != NULL) {
			gai->frame_label = g_strdup_printf("%.19s", protocol);
			gai->comment = g_strdup_printf("%s", protocol);
		}
	}

	g_free(protocol);
	g_free(colinfo);

	gai->line_style=1;
	gai->conv_num=0;
	gai->display=TRUE;

	graph_analysis->list = g_list_append(graph_analysis->list, gai);

	return 1;
}

/****************************************************************************/
/* Add a new tcp frame into the graph */
static int
flow_graph_tcp_add_to_graph(packet_info *pinfo, const struct tcpheader *tcph)
{
	graph_analysis_item_t *gai;
	/* copied from packet-tcp */
	const gchar *fstr[] = {"FIN", "SYN", "RST", "PSH", "ACK", "URG", "ECN", "CWR" };
	guint i, bpos;
	gboolean flags_found = FALSE;
	gchar flags[64];

	gai = g_malloc(sizeof(graph_analysis_item_t));
	gai->fd = pinfo->fd;
	if (node_addr_type == NODE_ADDR_TYPE_NET_SRCDST) {
		COPY_ADDRESS(&(gai->src_addr),&(pinfo->net_src));
		COPY_ADDRESS(&(gai->dst_addr),&(pinfo->net_dst));
	} else {
		COPY_ADDRESS(&(gai->src_addr),&(pinfo->src));
		COPY_ADDRESS(&(gai->dst_addr),&(pinfo->dst));
	}
	gai->port_src=pinfo->srcport;
	gai->port_dst=pinfo->destport;

	flags[0] = '\0';
	for (i = 0; i < 8; i++) {
		bpos = 1 << i;
		if (tcph->th_flags & bpos) {
			if (flags_found) {
				g_strlcat(flags, ", ", sizeof(flags));
			}
			g_strlcat(flags, fstr[i], sizeof(flags));
			flags_found = TRUE;
		}
	}
	if (flags[0] == '\0') {
		g_snprintf (flags, sizeof(flags), "<None>");
	}

	if ((tcph->th_have_seglen)&&(tcph->th_seglen!=0)){
		gai->frame_label = g_strdup_printf("%s - Len: %u",flags, tcph->th_seglen);
	}
	else{
		gai->frame_label = g_strdup(flags);
	}

	if (tcph->th_flags & TH_ACK)
		gai->comment = g_strdup_printf("Seq = %u Ack = %u",tcph->th_seq, tcph->th_ack);
	else
		gai->comment = g_strdup_printf("Seq = %u",tcph->th_seq);

	gai->line_style=1;
	gai->conv_num=0;
	gai->display=TRUE;

	graph_analysis->list = g_list_append(graph_analysis->list, gai);

	return 1;
}



/****************************************************************************/
/* whenever a frame packet is seen by the tap listener */
static gboolean
flow_graph_frame_packet( void *ptr _U_, packet_info *pinfo, epan_dissect_t *edt _U_, const void *dummy _U_)
{
	if ((type_of_packets == TYPE_OF_PACKETS_ALL)||(pinfo->fd->flags.passed_dfilter==1)){
		flow_graph_frame_add_to_graph(pinfo);
	}

	return TRUE;
}

/****************************************************************************/
/* whenever a TCP packet is seen by the tap listener */
static gboolean
flow_graph_tcp_packet( void *ptr _U_, packet_info *pinfo, epan_dissect_t *edt _U_, const void *tcp_info)
{
	const struct tcpheader *tcph = tcp_info;

	if ((type_of_packets == TYPE_OF_PACKETS_ALL)||(pinfo->fd->flags.passed_dfilter==1)){
		flow_graph_tcp_add_to_graph(pinfo,tcph);
	}

	return TRUE;
}


static void
flow_graph_packet_draw(void *prs _U_)
{
	return;
}

/****************************************************************************/
static void
flow_graph_on_ok                    (GtkButton       *button _U_,
				     gpointer         user_data)
{
	if ((have_frame_tap_listener==TRUE)
		||(have_tcp_tap_listener==TRUE))
	{
		/* remove_tap_listeners */
		remove_tap_listener_flow_graph();
	}

	/* Scan for displayed packets (retap all packets) */

	if (type_of_flow == TYPE_OF_FLOW_GENERAL){
		/* Register the tap listener */

		if(have_frame_tap_listener==FALSE)
		{
			/* don't register tap listener, if we have it already */
			register_tap_listener("frame", &tap_identifier, NULL,
				TL_REQUIRES_COLUMNS,
				flow_graph_reset,
				flow_graph_frame_packet,
				flow_graph_packet_draw
				);
			have_frame_tap_listener=TRUE;
		}

		cf_retap_packets(&cfile);
	}
	else if (type_of_flow == TYPE_OF_FLOW_TCP){
	/* Register the tap listener */

		if(have_tcp_tap_listener==FALSE)
		{
			/* don't register tap listener, if we have it already */
			register_tap_listener("tcp", &tap_identifier, NULL,
				0,
				flow_graph_reset,
				flow_graph_tcp_packet,
				flow_graph_packet_draw
				);
			have_tcp_tap_listener=TRUE;
		}

		cf_retap_packets(&cfile);
	}

	if (graph_analysis_data->dlg.window != NULL){ /* if we still have a window */
		graph_analysis_update(graph_analysis_data);		/* refresh it xxx */
	}
	else{
		graph_analysis_data->dlg.parent_w = user_data;
		graph_analysis_create(graph_analysis_data);
	}
}


/****************************************************************************/
/* INTERFACE                                                                */
/****************************************************************************/

static void
flow_graph_dlg_create (void)
{
	GtkWidget *flow_graph_dlg_w;
	GtkWidget *main_vb;
	GtkWidget *hbuttonbox;
	GtkWidget *bt_cancel, *bt_ok;
#if 0
	GtkWidget *top_label = NULL;
#endif
	GtkWidget *flow_type_fr, *range_fr, *range_tb, *flow_type_tb, *node_addr_fr, *node_addr_tb;

	flow_graph_dlg_w = dlg_window_new("Wireshark: Flow Graph");  /* transient_for top_level */
	gtk_window_set_destroy_with_parent (GTK_WINDOW(flow_graph_dlg_w), TRUE);

	gtk_window_set_default_size(GTK_WINDOW(flow_graph_dlg_w), 250, 150);

	main_vb = ws_gtk_box_new(GTK_ORIENTATION_VERTICAL, 0, FALSE);
	gtk_container_add(GTK_CONTAINER(flow_graph_dlg_w), main_vb);
	gtk_container_set_border_width (GTK_CONTAINER (main_vb), 7);

#if 0
	top_label = gtk_label_new ("Choose packets to include in the graph");
	gtk_box_pack_start (GTK_BOX (main_vb), top_label, FALSE, FALSE, 8);
#endif

	gtk_widget_show(flow_graph_dlg_w);

	/*** Packet range frame ***/
	range_fr = gtk_frame_new("Choose packets");
	gtk_box_pack_start(GTK_BOX(main_vb), range_fr, FALSE, FALSE, 5);

	range_tb = gtk_table_new(4, 4, FALSE);
	gtk_container_set_border_width(GTK_CONTAINER(range_tb), 5);
	gtk_container_add(GTK_CONTAINER(range_fr), range_tb);

	/* Process all packets */
	select_all_rb = gtk_radio_button_new_with_mnemonic_from_widget(NULL, "_All packets");
	gtk_widget_set_tooltip_text (select_all_rb, ("Process all packets"));
	g_signal_connect(select_all_rb, "toggled", G_CALLBACK(toggle_select_all), NULL);
	gtk_table_attach_defaults(GTK_TABLE(range_tb), select_all_rb, 0, 1, 0, 1);
	if (type_of_packets == TYPE_OF_PACKETS_ALL) {
		gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(select_all_rb),TRUE);
	}
 	gtk_widget_show(select_all_rb);

	/* Process displayed packets */
	select_displayed_rb = gtk_radio_button_new_with_mnemonic_from_widget(GTK_RADIO_BUTTON(select_all_rb),
                                                                             "_Displayed packets");
	gtk_widget_set_tooltip_text (select_displayed_rb, ("Process displayed packets"));
	g_signal_connect(select_displayed_rb, "toggled", G_CALLBACK(toggle_select_displayed), NULL);
	gtk_table_attach_defaults(GTK_TABLE(range_tb), select_displayed_rb, 0, 1, 1, 2);
	if (type_of_packets == TYPE_OF_PACKETS_DISPLAYED) {
		gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(select_displayed_rb),TRUE);
	}
 	gtk_widget_show(select_displayed_rb);

	gtk_widget_show(range_tb);
	gtk_widget_show(range_fr);

	/*** Flow type frame ***/
	flow_type_fr = gtk_frame_new("Choose flow type");
	gtk_box_pack_start(GTK_BOX(main_vb), flow_type_fr, FALSE, FALSE, 5);

	flow_type_tb = gtk_table_new(4, 4, FALSE);
	gtk_container_set_border_width(GTK_CONTAINER(flow_type_tb), 5);
	gtk_container_add(GTK_CONTAINER(flow_type_fr), flow_type_tb);

	/* General information */
	select_general_rb = gtk_radio_button_new_with_mnemonic_from_widget(NULL, "_General flow");
	gtk_widget_set_tooltip_text (select_general_rb,	("Show all packets, with general information"));
	g_signal_connect(select_general_rb, "toggled", G_CALLBACK(toggle_select_general), NULL);
	gtk_table_attach_defaults(GTK_TABLE(flow_type_tb), select_general_rb, 0, 1, 0, 1);
	if (type_of_flow == TYPE_OF_FLOW_GENERAL) {
		gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(select_general_rb),TRUE);
	}
 	gtk_widget_show(select_general_rb);

	/* TCP specific information */
	select_tcp_rb = gtk_radio_button_new_with_mnemonic_from_widget(GTK_RADIO_BUTTON(select_general_rb),
                                                                       "_TCP flow");
	gtk_widget_set_tooltip_text (select_tcp_rb, ("Show only TCP packets, with TCP specific information"));
	g_signal_connect(select_tcp_rb, "toggled", G_CALLBACK(toggle_select_tcp), NULL);
	gtk_table_attach_defaults(GTK_TABLE(flow_type_tb), select_tcp_rb, 0, 1, 1, 2);
	if (type_of_flow == TYPE_OF_FLOW_TCP) {
		gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(select_tcp_rb),TRUE);
	}
 	gtk_widget_show(select_tcp_rb);

	gtk_widget_show(flow_type_tb);
	gtk_widget_show(flow_type_fr);

	/*** Node address type frame ***/
	node_addr_fr = gtk_frame_new("Choose node address type");
	gtk_box_pack_start(GTK_BOX(main_vb), node_addr_fr, FALSE, FALSE, 5);

	node_addr_tb = gtk_table_new(4, 4, FALSE);
	gtk_container_set_border_width(GTK_CONTAINER(node_addr_tb), 5);
	gtk_container_add(GTK_CONTAINER(node_addr_fr), node_addr_tb);

	/* Source / Dest address */
	src_dst_rb = gtk_radio_button_new_with_mnemonic_from_widget(NULL, "_Standard source/destination addresses");
	gtk_widget_set_tooltip_text (src_dst_rb,
		("Nodes in the diagram are identified with source and destination addresses"));
	g_signal_connect(src_dst_rb, "toggled", G_CALLBACK(toggle_select_srcdst), NULL);
	gtk_table_attach_defaults(GTK_TABLE(node_addr_tb), src_dst_rb, 0, 1, 0, 1);
	if (node_addr_type == NODE_ADDR_TYPE_SRCDST) {
		gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(src_dst_rb),TRUE);
	}
 	gtk_widget_show(src_dst_rb);

	/* Network source / dest address */
	net_src_dst_rb = gtk_radio_button_new_with_mnemonic_from_widget(GTK_RADIO_BUTTON(src_dst_rb),
                                                                        "_Network source/destination addresses");
	gtk_widget_set_tooltip_text (net_src_dst_rb,
		("Nodes in the diagram are identified with network source and destination addresses"));
	g_signal_connect(net_src_dst_rb, "toggled", G_CALLBACK(toggle_select_netsrcdst), NULL);
	gtk_table_attach_defaults(GTK_TABLE(node_addr_tb), net_src_dst_rb, 0, 1, 1, 2);
	if (node_addr_type == NODE_ADDR_TYPE_NET_SRCDST) {
		gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(net_src_dst_rb),TRUE);
	}
 	gtk_widget_show(net_src_dst_rb);

	gtk_widget_show(node_addr_tb);
	gtk_widget_show(node_addr_fr);

	/* button row */
	hbuttonbox = gtk_hbutton_box_new ();
	gtk_box_pack_start (GTK_BOX (main_vb), hbuttonbox, FALSE, FALSE, 5);
	gtk_button_box_set_layout (GTK_BUTTON_BOX (hbuttonbox), GTK_BUTTONBOX_SPREAD);
	gtk_box_set_spacing (GTK_BOX (hbuttonbox), 30);

	bt_ok = gtk_button_new_from_stock(GTK_STOCK_OK);
	gtk_container_add(GTK_CONTAINER(hbuttonbox), bt_ok);
	gtk_widget_set_tooltip_text (bt_ok, "Show the flow graph");
	g_signal_connect(bt_ok, "clicked", G_CALLBACK(flow_graph_on_ok), flow_graph_dlg_w);
	gtk_widget_show(bt_ok);

	bt_cancel = gtk_button_new_from_stock(GTK_STOCK_CANCEL);
	gtk_container_add (GTK_CONTAINER (hbuttonbox), bt_cancel);
#if GTK_CHECK_VERSION(2,18,0)
	gtk_widget_set_can_default(bt_cancel, TRUE);
#else
	GTK_WIDGET_SET_FLAGS(bt_cancel, GTK_CAN_DEFAULT);
#endif
	gtk_widget_set_tooltip_text (bt_cancel, "Cancel this dialog");
	window_set_cancel_button(flow_graph_dlg_w, bt_cancel, window_cancel_button_cb);

	g_signal_connect(flow_graph_dlg_w, "delete_event", G_CALLBACK(window_delete_event_cb), NULL);
	g_signal_connect(flow_graph_dlg_w, "destroy", G_CALLBACK(flow_graph_on_destroy), NULL);

	gtk_widget_show_all(flow_graph_dlg_w);
	window_present(flow_graph_dlg_w);

	flow_graph_dlg = flow_graph_dlg_w;
}

/****************************************************************************/
/* PUBLIC								    */
/****************************************************************************/

/* init function for tap */
static void
flow_graph_init_tap(const char *dummy _U_, void* userdata _U_)
{
	/* The storage allocated by flow_graph_data_init() and graph_analysis_init()  */
	/*  will be considered to be "associated with" the flow_graph_dlg dialog box. */
	/* It will be freed when the flow_graph_dlg dialog box is destroyed.          */
	if (flow_graph_dlg != NULL) {
		g_assert(graph_analysis != NULL);
		g_assert(graph_analysis_data != NULL);
		/* There's already a dialog box; reactivate it. */
		reactivate_window(flow_graph_dlg);
	} else {
		g_assert(graph_analysis == NULL);
		g_assert(graph_analysis_data == NULL);

		/* initialize graph items store */
		flow_graph_data_init();

		/* init the Graph Analysis */
		graph_analysis_data = graph_analysis_init();
		graph_analysis_data->graph_info = graph_analysis;

		flow_graph_dlg_create();
	}
}


/****************************************************************************/
/* entry point when called via the GTK menu */
void
flow_graph_launch(GtkAction *action _U_, gpointer user_data _U_)
{
	flow_graph_init_tap("",NULL);
}

/****************************************************************************/
void
register_tap_listener_flow_graph(void)
{
	register_stat_cmd_arg("flow_graph",flow_graph_init_tap,NULL);
}